From 94b57c15618c1e2bb7bcf4501e0102f7e4bf6b64 Mon Sep 17 00:00:00 2001 From: Philip Guo Date: Fri, 13 Apr 2012 17:02:19 -0700 Subject: [PATCH 001/502] added CS Circles fork reference --- tutor.html | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/tutor.html b/tutor.html index eaa8c4913..c65942bd3 100644 --- a/tutor.html +++ b/tutor.html @@ -109,7 +109,7 @@

-Then try some programming questions:
+Then try some sample programming questions:
Solve: Two-sum | Reverse list | @@ -196,9 +196,9 @@ production code.

Official Python 3 support is coming soon; -for now, try the Python 3 fork by -Peter Wentworth. +for now, try the Python 3 forks by CS Circles and +Peter Wentworth.

Check out the Date: Fri, 13 Apr 2012 17:04:51 -0700 Subject: [PATCH 002/502] updated copyright and links --- index.html | 6 +++--- tutor.html | 4 ++-- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/index.html b/index.html index c7694a825..27f4ac656 100644 --- a/index.html +++ b/index.html @@ -4,7 +4,7 @@ diff --git a/question.html b/question.html index 6ea6ea4d2..16fd8bf78 100644 --- a/question.html +++ b/question.html @@ -4,21 +4,28 @@ diff --git a/tutor.html b/tutor.html index 956827705..2027c9de5 100644 --- a/tutor.html +++ b/tutor.html @@ -4,21 +4,28 @@ From 6cd960e5ba7fb2baa356447b97f304bf03e81f91 Mon Sep 17 00:00:00 2001 From: Philip Guo Date: Mon, 16 Jul 2012 21:16:47 -0700 Subject: [PATCH 004/502] removed demjson dependency and moved over to Python 2.6 --- README | 4 +- cgi-bin/demjson.py | 2138 -------------------------------------- cgi-bin/load_question.py | 2 +- cgi-bin/pg_logger.py | 2 +- cgi-bin/web_exec.py | 12 +- cgi-bin/web_run_test.py | 8 +- question.html | 2 +- tutor.html | 2 +- 8 files changed, 13 insertions(+), 2157 deletions(-) delete mode 100644 cgi-bin/demjson.py diff --git a/README b/README index 284cba9de..f24d68b2e 100644 --- a/README +++ b/README @@ -43,7 +43,7 @@ System architecture overview: The Online Python Tutor is implemented as a web application, with a JavaScript front-end making AJAX calls to a pure-Python back-end. -The back-end has been tested on an Apache server running Python 2.5 +The back-end has been tested on an Apache server running Python 2.6 through CGI. Note that it will probably fail in subtle ways on other Python 2.X (and will DEFINITELY fail on Python 3.X). Peter Wentworth has create a port to Python 3.X, and hopefully we can eventually @@ -97,8 +97,6 @@ The back-end resides in the cgi-bin/ sub-directory in this repository: grading back-end cgi-bin/pg_logger.py - the 'meat' of the back-end cgi-bin/pg_encoder.py - encodes Python data into JSON - cgi-bin/demjson.py - 3rd-party JSON module, since Python 2.5 - doesn't have the built-in 'import json' cgi-bin/create_db.py - for optional sqlite query logging cgi-bin/db_common.py - for optional sqlite query logging cgi-bin/.htaccess - for Apache CGI execute permissions diff --git a/cgi-bin/demjson.py b/cgi-bin/demjson.py deleted file mode 100644 index a513ee134..000000000 --- a/cgi-bin/demjson.py +++ /dev/null @@ -1,2138 +0,0 @@ -#!/usr/bin/env python -# -*- coding: utf-8 -*- -# -r""" A JSON data encoder and decoder. - - This Python module implements the JSON (http://json.org/) data - encoding format; a subset of ECMAScript (aka JavaScript) for encoding - primitive data types (numbers, strings, booleans, lists, and - associative arrays) in a language-neutral simple text-based syntax. - - It can encode or decode between JSON formatted strings and native - Python data types. Normally you would use the encode() and decode() - functions defined by this module, but if you want more control over - the processing you can use the JSON class. - - This implementation tries to be as completely cormforming to all - intricacies of the standards as possible. It can operate in strict - mode (which only allows JSON-compliant syntax) or a non-strict mode - (which allows much more of the whole ECMAScript permitted syntax). - This includes complete support for Unicode strings (including - surrogate-pairs for non-BMP characters), and all number formats - including negative zero and IEEE 754 non-numbers such a NaN or - Infinity. - - The JSON/ECMAScript to Python type mappings are: - ---JSON--- ---Python--- - null None - undefined undefined (note 1) - Boolean (true,false) bool (True or False) - Integer int or long (note 2) - Float float - String str or unicode ( "..." or u"..." ) - Array [a, ...] list ( [...] ) - Object {a:b, ...} dict ( {...} ) - - -- Note 1. an 'undefined' object is declared in this module which - represents the native Python value for this type when in - non-strict mode. - - -- Note 2. some ECMAScript integers may be up-converted to Python - floats, such as 1e+40. Also integer -0 is converted to - float -0, so as to preserve the sign (which ECMAScript requires). - - In addition, when operating in non-strict mode, several IEEE 754 - non-numbers are also handled, and are mapped to specific Python - objects declared in this module: - - NaN (not a number) nan (float('nan')) - Infinity, +Infinity inf (float('inf')) - -Infinity neginf (float('-inf')) - - When encoding Python objects into JSON, you may use types other than - native lists or dictionaries, as long as they support the minimal - interfaces required of all sequences or mappings. This means you can - use generators and iterators, tuples, UserDict subclasses, etc. - - To make it easier to produce JSON encoded representations of user - defined classes, if the object has a method named json_equivalent(), - then it will call that method and attempt to encode the object - returned from it instead. It will do this recursively as needed and - before any attempt to encode the object using it's default - strategies. Note that any json_equivalent() method should return - "equivalent" Python objects to be encoded, not an already-encoded - JSON-formatted string. There is no such aid provided to decode - JSON back into user-defined classes as that would dramatically - complicate the interface. - - When decoding strings with this module it may operate in either - strict or non-strict mode. The strict mode only allows syntax which - is conforming to RFC 4627 (JSON), while the non-strict allows much - more of the permissible ECMAScript syntax. - - The following are permitted when processing in NON-STRICT mode: - - * Unicode format control characters are allowed anywhere in the input. - * All Unicode line terminator characters are recognized. - * All Unicode white space characters are recognized. - * The 'undefined' keyword is recognized. - * Hexadecimal number literals are recognized (e.g., 0xA6, 0177). - * String literals may use either single or double quote marks. - * Strings may contain \x (hexadecimal) escape sequences, as well as the - \v and \0 escape sequences. - * Lists may have omitted (elided) elements, e.g., [,,,,,], with - missing elements interpreted as 'undefined' values. - * Object properties (dictionary keys) can be of any of the - types: string literals, numbers, or identifiers (the later of - which are treated as if they are string literals)---as permitted - by ECMAScript. JSON only permits strings literals as keys. - - Concerning non-strict and non-ECMAScript allowances: - - * Octal numbers: If you allow the 'octal_numbers' behavior (which - is never enabled by default), then you can use octal integers - and octal character escape sequences (per the ECMAScript - standard Annex B.1.2). This behavior is allowed, if enabled, - because it was valid JavaScript at one time. - - * Multi-line string literals: Strings which are more than one - line long (contain embedded raw newline characters) are never - permitted. This is neither valid JSON nor ECMAScript. Some other - JSON implementations may allow this, but this module considers - that behavior to be a mistake. - - References: - * JSON (JavaScript Object Notation) - - * RFC 4627. The application/json Media Type for JavaScript Object Notation (JSON) - - * ECMA-262 3rd edition (1999) - - * IEEE 754-1985: Standard for Binary Floating-Point Arithmetic. - - -""" - -__author__ = "Deron Meranda " -__date__ = "2008-12-17" -__version__ = "1.4" -__credits__ = """Copyright (c) 2006-2008 Deron E. Meranda -Licensed under GNU LGPL 3.0 (GNU Lesser General Public License) or -later. See LICENSE.txt included with this software. - -This program is free software: you can redistribute it and/or modify -it under the terms of the GNU Lesser General Public License as -published by the Free Software Foundation, either version 3 of the -License, or (at your option) any later version. - -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU Lesser General Public License -along with this program. If not, see -or . - -""" - -# ------------------------------ -# useful global constants - -content_type = 'application/json' -file_ext = 'json' -hexdigits = '0123456789ABCDEFabcdef' -octaldigits = '01234567' - -# ---------------------------------------------------------------------- -# Decimal and float types. -# -# If a JSON number can not be stored in a Python float without loosing -# precision and the Python has the decimal type, then we will try to -# use decimal instead of float. To make this determination we need to -# know the limits of the float type, but Python doesn't have an easy -# way to tell what the largest floating-point number it supports. So, -# we detemine the precision and scale of the float type by testing it. - -try: - # decimal module was introduced in Python 2.4 - import decimal -except ImportError: - decimal = None - -def determine_float_precision(): - """Returns a tuple (significant_digits, max_exponent) for the float type. - """ - import math - # Just count the digits in pi. The last two decimal digits - # may only be partial digits, so discount for them. - whole, frac = repr(math.pi).split('.') - sigdigits = len(whole) + len(frac) - 2 - - # This is a simple binary search. We find the largest exponent - # that the float() type can handle without going infinite or - # raising errors. - maxexp = None - minv = 0; maxv = 1000 - while True: - if minv+1 == maxv: - maxexp = minv - 1 - break - elif maxv < minv: - maxexp = None - break - m = (minv + maxv) // 2 - try: - f = repr(float( '1e+%d' % m )) - except ValueError: - f = None - else: - if not f or f[0] < '0' or f[0] > '9': - f = None - if not f: - # infinite - maxv = m - else: - minv = m - return sigdigits, maxexp - -float_sigdigits, float_maxexp = determine_float_precision() - -# ---------------------------------------------------------------------- -# The undefined value. -# -# ECMAScript has an undefined value (similar to yet distinct from null). -# Neither Python or strict JSON have support undefined, but to allow -# JavaScript behavior we must simulate it. - -class _undefined_class(object): - """Represents the ECMAScript 'undefined' value.""" - __slots__ = [] - def __repr__(self): - return self.__module__ + '.undefined' - def __str__(self): - return 'undefined' - def __nonzero__(self): - return False -undefined = _undefined_class() -del _undefined_class - - -# ---------------------------------------------------------------------- -# Non-Numbers: NaN, Infinity, -Infinity -# -# ECMAScript has official support for non-number floats, although -# strict JSON does not. Python doesn't either. So to support the -# full JavaScript behavior we must try to add them into Python, which -# is unfortunately a bit of black magic. If our python implementation -# happens to be built on top of IEEE 754 we can probably trick python -# into using real floats. Otherwise we must simulate it with classes. - -def _nonnumber_float_constants(): - """Try to return the Nan, Infinity, and -Infinity float values. - - This is unnecessarily complex because there is no standard - platform- independent way to do this in Python as the language - (opposed to some implementation of it) doesn't discuss - non-numbers. We try various strategies from the best to the - worst. - - If this Python interpreter uses the IEEE 754 floating point - standard then the returned values will probably be real instances - of the 'float' type. Otherwise a custom class object is returned - which will attempt to simulate the correct behavior as much as - possible. - - """ - try: - # First, try (mostly portable) float constructor. Works under - # Linux x86 (gcc) and some Unices. - nan = float('nan') - inf = float('inf') - neginf = float('-inf') - except ValueError: - try: - # Try the AIX (PowerPC) float constructors - nan = float('NaNQ') - inf = float('INF') - neginf = float('-INF') - except ValueError: - try: - # Next, try binary unpacking. Should work under - # platforms using IEEE 754 floating point. - import struct, sys - xnan = '7ff8000000000000'.decode('hex') # Quiet NaN - xinf = '7ff0000000000000'.decode('hex') - xcheck = 'bdc145651592979d'.decode('hex') # -3.14159e-11 - # Could use float.__getformat__, but it is a new python feature, - # so we use sys.byteorder. - if sys.byteorder == 'big': - nan = struct.unpack('d', xnan)[0] - inf = struct.unpack('d', xinf)[0] - check = struct.unpack('d', xcheck)[0] - else: - nan = struct.unpack('d', xnan[::-1])[0] - inf = struct.unpack('d', xinf[::-1])[0] - check = struct.unpack('d', xcheck[::-1])[0] - neginf = - inf - if check != -3.14159e-11: - raise ValueError('Unpacking raw IEEE 754 floats does not work') - except (ValueError, TypeError): - # Punt, make some fake classes to simulate. These are - # not perfect though. For instance nan * 1.0 == nan, - # as expected, but 1.0 * nan == 0.0, which is wrong. - class nan(float): - """An approximation of the NaN (not a number) floating point number.""" - def __repr__(self): return 'nan' - def __str__(self): return 'nan' - def __add__(self,x): return self - def __radd__(self,x): return self - def __sub__(self,x): return self - def __rsub__(self,x): return self - def __mul__(self,x): return self - def __rmul__(self,x): return self - def __div__(self,x): return self - def __rdiv__(self,x): return self - def __divmod__(self,x): return (self,self) - def __rdivmod__(self,x): return (self,self) - def __mod__(self,x): return self - def __rmod__(self,x): return self - def __pow__(self,exp): return self - def __rpow__(self,exp): return self - def __neg__(self): return self - def __pos__(self): return self - def __abs__(self): return self - def __lt__(self,x): return False - def __le__(self,x): return False - def __eq__(self,x): return False - def __neq__(self,x): return True - def __ge__(self,x): return False - def __gt__(self,x): return False - def __complex__(self,*a): raise NotImplementedError('NaN can not be converted to a complex') - if decimal: - nan = decimal.Decimal('NaN') - else: - nan = nan() - class inf(float): - """An approximation of the +Infinity floating point number.""" - def __repr__(self): return 'inf' - def __str__(self): return 'inf' - def __add__(self,x): return self - def __radd__(self,x): return self - def __sub__(self,x): return self - def __rsub__(self,x): return self - def __mul__(self,x): - if x is neginf or x < 0: - return neginf - elif x == 0: - return nan - else: - return self - def __rmul__(self,x): return self.__mul__(x) - def __div__(self,x): - if x == 0: - raise ZeroDivisionError('float division') - elif x < 0: - return neginf - else: - return self - def __rdiv__(self,x): - if x is inf or x is neginf or x is nan: - return nan - return 0.0 - def __divmod__(self,x): - if x == 0: - raise ZeroDivisionError('float divmod()') - elif x < 0: - return (nan,nan) - else: - return (self,self) - def __rdivmod__(self,x): - if x is inf or x is neginf or x is nan: - return (nan, nan) - return (0.0, x) - def __mod__(self,x): - if x == 0: - raise ZeroDivisionError('float modulo') - else: - return nan - def __rmod__(self,x): - if x is inf or x is neginf or x is nan: - return nan - return x - def __pow__(self, exp): - if exp == 0: - return 1.0 - else: - return self - def __rpow__(self, x): - if -1 < x < 1: return 0.0 - elif x == 1.0: return 1.0 - elif x is nan or x is neginf or x < 0: - return nan - else: - return self - def __neg__(self): return neginf - def __pos__(self): return self - def __abs__(self): return self - def __lt__(self,x): return False - def __le__(self,x): - if x is self: - return True - else: - return False - def __eq__(self,x): - if x is self: - return True - else: - return False - def __neq__(self,x): - if x is self: - return False - else: - return True - def __ge__(self,x): return True - def __gt__(self,x): return True - def __complex__(self,*a): raise NotImplementedError('Infinity can not be converted to a complex') - if decimal: - inf = decimal.Decimal('Infinity') - else: - inf = inf() - class neginf(float): - """An approximation of the -Infinity floating point number.""" - def __repr__(self): return '-inf' - def __str__(self): return '-inf' - def __add__(self,x): return self - def __radd__(self,x): return self - def __sub__(self,x): return self - def __rsub__(self,x): return self - def __mul__(self,x): - if x is self or x < 0: - return inf - elif x == 0: - return nan - else: - return self - def __rmul__(self,x): return self.__mul__(self) - def __div__(self,x): - if x == 0: - raise ZeroDivisionError('float division') - elif x < 0: - return inf - else: - return self - def __rdiv__(self,x): - if x is inf or x is neginf or x is nan: - return nan - return -0.0 - def __divmod__(self,x): - if x == 0: - raise ZeroDivisionError('float divmod()') - elif x < 0: - return (nan,nan) - else: - return (self,self) - def __rdivmod__(self,x): - if x is inf or x is neginf or x is nan: - return (nan, nan) - return (-0.0, x) - def __mod__(self,x): - if x == 0: - raise ZeroDivisionError('float modulo') - else: - return nan - def __rmod__(self,x): - if x is inf or x is neginf or x is nan: - return nan - return x - def __pow__(self,exp): - if exp == 0: - return 1.0 - else: - return self - def __rpow__(self, x): - if x is nan or x is inf or x is inf: - return nan - return 0.0 - def __neg__(self): return inf - def __pos__(self): return self - def __abs__(self): return inf - def __lt__(self,x): return True - def __le__(self,x): return True - def __eq__(self,x): - if x is self: - return True - else: - return False - def __neq__(self,x): - if x is self: - return False - else: - return True - def __ge__(self,x): - if x is self: - return True - else: - return False - def __gt__(self,x): return False - def __complex__(self,*a): raise NotImplementedError('-Infinity can not be converted to a complex') - if decimal: - neginf = decimal.Decimal('-Infinity') - else: - neginf = neginf(0) - return nan, inf, neginf - -nan, inf, neginf = _nonnumber_float_constants() -del _nonnumber_float_constants - - -# ---------------------------------------------------------------------- -# String processing helpers - -unsafe_string_chars = '"\\' + ''.join([chr(i) for i in range(0x20)]) -def skipstringsafe( s, start=0, end=None ): - i = start - #if end is None: - # end = len(s) - while i < end and s[i] not in unsafe_string_chars: - #c = s[i] - #if c in unsafe_string_chars: - # break - i += 1 - return i -def skipstringsafe_slow( s, start=0, end=None ): - i = start - if end is None: - end = len(s) - while i < end: - c = s[i] - if c == '"' or c == '\\' or ord(c) <= 0x1f: - break - i += 1 - return i - -def extend_list_with_sep( orig_seq, extension_seq, sepchar='' ): - if not sepchar: - orig_seq.extend( extension_seq ) - else: - for i, x in enumerate(extension_seq): - if i > 0: - orig_seq.append( sepchar ) - orig_seq.append( x ) - -def extend_and_flatten_list_with_sep( orig_seq, extension_seq, separator='' ): - for i, part in enumerate(extension_seq): - if i > 0 and separator: - orig_seq.append( separator ) - orig_seq.extend( part ) - - -# ---------------------------------------------------------------------- -# Unicode helpers -# -# JSON requires that all JSON implementations must support the UTF-32 -# encoding (as well as UTF-8 and UTF-16). But earlier versions of -# Python did not provide a UTF-32 codec. So we must implement UTF-32 -# ourselves in case we need it. - -def utf32le_encode( obj, errors='strict' ): - """Encodes a Unicode string into a UTF-32LE encoded byte string.""" - import struct - try: - import cStringIO as sio - except ImportError: - import StringIO as sio - f = sio.StringIO() - write = f.write - pack = struct.pack - for c in obj: - n = ord(c) - if 0xD800 <= n <= 0xDFFF: # surrogate codepoints are prohibited by UTF-32 - if errors == 'ignore': - continue - elif errors == 'replace': - n = ord('?') - else: - cname = 'U+%04X'%n - raise UnicodeError('UTF-32 can not encode surrogate characters',cname) - write( pack('L', n) ) - return f.getvalue() - - -def utf32le_decode( obj, errors='strict' ): - """Decodes a UTF-32LE byte string into a Unicode string.""" - if len(obj) % 4 != 0: - raise UnicodeError('UTF-32 decode error, data length not a multiple of 4 bytes') - import struct - unpack = struct.unpack - chars = [] - i = 0 - for i in range(0, len(obj), 4): - seq = obj[i:i+4] - n = unpack('L',seq)[0] - chars.append( unichr(n) ) - return u''.join( chars ) - - -def auto_unicode_decode( s ): - """Takes a string and tries to convert it to a Unicode string. - - This will return a Python unicode string type corresponding to the - input string (either str or unicode). The character encoding is - guessed by looking for either a Unicode BOM prefix, or by the - rules specified by RFC 4627. When in doubt it is assumed the - input is encoded in UTF-8 (the default for JSON). - - """ - if isinstance(s, unicode): - return s - if len(s) < 4: - return s.decode('utf8') # not enough bytes, assume default of utf-8 - # Look for BOM marker - import codecs - bom2 = s[:2] - bom4 = s[:4] - a, b, c, d = map(ord, s[:4]) # values of first four bytes - if bom4 == codecs.BOM_UTF32_LE: - encoding = 'utf-32le' - s = s[4:] - elif bom4 == codecs.BOM_UTF32_BE: - encoding = 'utf-32be' - s = s[4:] - elif bom2 == codecs.BOM_UTF16_LE: - encoding = 'utf-16le' - s = s[2:] - elif bom2 == codecs.BOM_UTF16_BE: - encoding = 'utf-16be' - s = s[2:] - # No BOM, so autodetect encoding used by looking at first four bytes - # according to RFC 4627 section 3. - elif a==0 and b==0 and c==0 and d!=0: # UTF-32BE - encoding = 'utf-32be' - elif a==0 and b!=0 and c==0 and d!=0: # UTF-16BE - encoding = 'utf-16be' - elif a!=0 and b==0 and c==0 and d==0: # UTF-32LE - encoding = 'utf-32le' - elif a!=0 and b==0 and c!=0 and d==0: # UTF-16LE - encoding = 'utf-16le' - else: #if a!=0 and b!=0 and c!=0 and d!=0: # UTF-8 - # JSON spec says default is UTF-8, so always guess it - # if we can't guess otherwise - encoding = 'utf8' - # Make sure the encoding is supported by Python - try: - cdk = codecs.lookup(encoding) - except LookupError: - if encoding.startswith('utf-32') \ - or encoding.startswith('ucs4') \ - or encoding.startswith('ucs-4'): - # Python doesn't natively have a UTF-32 codec, but JSON - # requires that it be supported. So we must decode these - # manually. - if encoding.endswith('le'): - unis = utf32le_decode(s) - else: - unis = utf32be_decode(s) - else: - raise JSONDecodeError('this python has no codec for this character encoding',encoding) - else: - # Convert to unicode using a standard codec - unis = s.decode(encoding) - return unis - - -def surrogate_pair_as_unicode( c1, c2 ): - """Takes a pair of unicode surrogates and returns the equivalent unicode character. - - The input pair must be a surrogate pair, with c1 in the range - U+D800 to U+DBFF and c2 in the range U+DC00 to U+DFFF. - - """ - n1, n2 = ord(c1), ord(c2) - if n1 < 0xD800 or n1 > 0xDBFF or n2 < 0xDC00 or n2 > 0xDFFF: - raise JSONDecodeError('illegal Unicode surrogate pair',(c1,c2)) - a = n1 - 0xD800 - b = n2 - 0xDC00 - v = (a << 10) | b - v += 0x10000 - return unichr(v) - - -def unicode_as_surrogate_pair( c ): - """Takes a single unicode character and returns a sequence of surrogate pairs. - - The output of this function is a tuple consisting of one or two unicode - characters, such that if the input character is outside the BMP range - then the output is a two-character surrogate pair representing that character. - - If the input character is inside the BMP then the output tuple will have - just a single character...the same one. - - """ - n = ord(c) - if n < 0x10000: - return (unichr(n),) # in BMP, surrogate pair not required - v = n - 0x10000 - vh = (v >> 10) & 0x3ff # highest 10 bits - vl = v & 0x3ff # lowest 10 bits - w1 = 0xD800 | vh - w2 = 0xDC00 | vl - return (unichr(w1), unichr(w2)) - - -# ---------------------------------------------------------------------- -# Type identification - -def isnumbertype( obj ): - """Is the object of a Python number type (excluding complex)?""" - return isinstance(obj, (int,long,float)) \ - and not isinstance(obj, bool) \ - or obj is nan or obj is inf or obj is neginf - - -def isstringtype( obj ): - """Is the object of a Python string type?""" - if isinstance(obj, basestring): - return True - # Must also check for some other pseudo-string types - import types, UserString - return isinstance(obj, types.StringTypes) \ - or isinstance(obj, UserString.UserString) \ - or isinstance(obj, UserString.MutableString) - - -# ---------------------------------------------------------------------- -# Numeric helpers - -def decode_hex( hexstring ): - """Decodes a hexadecimal string into it's integer value.""" - # We don't use the builtin 'hex' codec in python since it can - # not handle odd numbers of digits, nor raise the same type - # of exceptions we want to. - n = 0 - for c in hexstring: - if '0' <= c <= '9': - d = ord(c) - ord('0') - elif 'a' <= c <= 'f': - d = ord(c) - ord('a') + 10 - elif 'A' <= c <= 'F': - d = ord(c) - ord('A') + 10 - else: - raise JSONDecodeError('not a hexadecimal number',hexstring) - # Could use ((n << 4 ) | d), but python 2.3 issues a FutureWarning. - n = (n * 16) + d - return n - - -def decode_octal( octalstring ): - """Decodes an octal string into it's integer value.""" - n = 0 - for c in octalstring: - if '0' <= c <= '7': - d = ord(c) - ord('0') - else: - raise JSONDecodeError('not an octal number',octalstring) - # Could use ((n << 3 ) | d), but python 2.3 issues a FutureWarning. - n = (n * 8) + d - return n - - -# ---------------------------------------------------------------------- -# Exception classes. - -class JSONError(ValueError): - """Our base class for all JSON-related errors. - - """ - def pretty_description(self): - err = self.args[0] - if len(self.args) > 1: - err += ': ' - for anum, a in enumerate(self.args[1:]): - if anum > 1: - err += ', ' - astr = repr(a) - if len(astr) > 20: - astr = astr[:20] + '...' - err += astr - return err - -class JSONDecodeError(JSONError): - """An exception class raised when a JSON decoding error (syntax error) occurs.""" - - -class JSONEncodeError(JSONError): - """An exception class raised when a python object can not be encoded as a JSON string.""" - - -#---------------------------------------------------------------------- -# The main JSON encoder/decoder class. - -class JSON(object): - """An encoder/decoder for JSON data streams. - - Usually you will call the encode() or decode() methods. The other - methods are for lower-level processing. - - Whether the JSON parser runs in strict mode (which enforces exact - compliance with the JSON spec) or the more forgiving non-string mode - can be affected by setting the 'strict' argument in the object's - initialization; or by assigning True or False to the 'strict' - property of the object. - - You can also adjust a finer-grained control over strictness by - allowing or preventing specific behaviors. You can get a list of - all the available behaviors by accessing the 'behaviors' property. - Likewise the allowed_behaviors and prevented_behaviors list which - behaviors will be allowed and which will not. Call the allow() - or prevent() methods to adjust these. - - """ - _escapes_json = { # character escapes in JSON - '"': '"', - '/': '/', - '\\': '\\', - 'b': '\b', - 'f': '\f', - 'n': '\n', - 'r': '\r', - 't': '\t', - } - - _escapes_js = { # character escapes in Javascript - '"': '"', - '\'': '\'', - '\\': '\\', - 'b': '\b', - 'f': '\f', - 'n': '\n', - 'r': '\r', - 't': '\t', - 'v': '\v', - '0': '\x00' - } - - # Following is a reverse mapping of escape characters, used when we - # output JSON. Only those escapes which are always safe (e.g., in JSON) - # are here. It won't hurt if we leave questionable ones out. - _rev_escapes = {'\n': '\\n', - '\t': '\\t', - '\b': '\\b', - '\r': '\\r', - '\f': '\\f', - '"': '\\"', - '\\': '\\\\'} - - def __init__(self, strict=False, compactly=True, escape_unicode=False): - """Creates a JSON encoder/decoder object. - - If 'strict' is set to True, then only strictly-conforming JSON - output will be produced. Note that this means that some types - of values may not be convertable and will result in a - JSONEncodeError exception. - - If 'compactly' is set to True, then the resulting string will - have all extraneous white space removed; if False then the - string will be "pretty printed" with whitespace and indentation - added to make it more readable. - - If 'escape_unicode' is set to True, then all non-ASCII characters - will be represented as a unicode escape sequence; if False then - the actual real unicode character will be inserted if possible. - - The 'escape_unicode' can also be a function, which when called - with a single argument of a unicode character will return True - if the character should be escaped or False if it should not. - - If you wish to extend the encoding to ba able to handle - additional types, you should subclass this class and override - the encode_default() method. - - """ - import sys - self._set_strictness(strict) - self._encode_compactly = compactly - try: - # see if we were passed a predicate function - b = escape_unicode(u'A') - self._encode_unicode_as_escapes = escape_unicode - except (ValueError, NameError, TypeError): - # Just set to True or False. We could use lambda x:True - # to make it more consistent (always a function), but it - # will be too slow, so we'll make explicit tests later. - self._encode_unicode_as_escapes = bool(escape_unicode) - self._sort_dictionary_keys = True - - # The following is a boolean map of the first 256 characters - # which will quickly tell us which of those characters never - # need to be escaped. - - self._asciiencodable = [32 <= c < 128 and not self._rev_escapes.has_key(chr(c)) - for c in range(0,255)] - - def _set_strictness(self, strict): - """Changes the strictness behavior. - - Pass True to be very strict about JSON syntax, or False to be looser. - """ - self._allow_any_type_at_start = not strict - self._allow_all_numeric_signs = not strict - self._allow_comments = not strict - self._allow_control_char_in_string = not strict - self._allow_hex_numbers = not strict - self._allow_initial_decimal_point = not strict - self._allow_js_string_escapes = not strict - self._allow_non_numbers = not strict - self._allow_nonescape_characters = not strict # "\z" -> "z" - self._allow_nonstring_keys = not strict - self._allow_omitted_array_elements = not strict - self._allow_single_quoted_strings = not strict - self._allow_trailing_comma_in_literal = not strict - self._allow_undefined_values = not strict - self._allow_unicode_format_control_chars = not strict - self._allow_unicode_whitespace = not strict - # Always disable this by default - self._allow_octal_numbers = False - - def allow(self, behavior): - """Allow the specified behavior (turn off a strictness check). - - The list of all possible behaviors is available in the behaviors property. - You can see which behaviors are currently allowed by accessing the - allowed_behaviors property. - - """ - p = '_allow_' + behavior - if hasattr(self, p): - setattr(self, p, True) - else: - raise AttributeError('Behavior is not known',behavior) - - def prevent(self, behavior): - """Prevent the specified behavior (turn on a strictness check). - - The list of all possible behaviors is available in the behaviors property. - You can see which behaviors are currently prevented by accessing the - prevented_behaviors property. - - """ - p = '_allow_' + behavior - if hasattr(self, p): - setattr(self, p, False) - else: - raise AttributeError('Behavior is not known',behavior) - - def _get_behaviors(self): - return sorted([ n[len('_allow_'):] for n in self.__dict__ \ - if n.startswith('_allow_')]) - behaviors = property(_get_behaviors, - doc='List of known behaviors that can be passed to allow() or prevent() methods') - - def _get_allowed_behaviors(self): - return sorted([ n[len('_allow_'):] for n in self.__dict__ \ - if n.startswith('_allow_') and getattr(self,n)]) - allowed_behaviors = property(_get_allowed_behaviors, - doc='List of known behaviors that are currently allowed') - - def _get_prevented_behaviors(self): - return sorted([ n[len('_allow_'):] for n in self.__dict__ \ - if n.startswith('_allow_') and not getattr(self,n)]) - prevented_behaviors = property(_get_prevented_behaviors, - doc='List of known behaviors that are currently prevented') - - def _is_strict(self): - return not self.allowed_behaviors - strict = property(_is_strict, _set_strictness, - doc='True if adherence to RFC 4627 syntax is strict, or False is more generous ECMAScript syntax is permitted') - - - def isws(self, c): - """Determines if the given character is considered as white space. - - Note that Javscript is much more permissive on what it considers - to be whitespace than does JSON. - - Ref. ECMAScript section 7.2 - - """ - if not self._allow_unicode_whitespace: - return c in ' \t\n\r' - else: - if not isinstance(c,unicode): - c = unicode(c) - if c in u' \t\n\r\f\v': - return True - import unicodedata - return unicodedata.category(c) == 'Zs' - - def islineterm(self, c): - """Determines if the given character is considered a line terminator. - - Ref. ECMAScript section 7.3 - - """ - if c == '\r' or c == '\n': - return True - if c == u'\u2028' or c == u'\u2029': # unicodedata.category(c) in ['Zl', 'Zp'] - return True - return False - - def strip_format_control_chars(self, txt): - """Filters out all Unicode format control characters from the string. - - ECMAScript permits any Unicode "format control characters" to - appear at any place in the source code. They are to be - ignored as if they are not there before any other lexical - tokenization occurs. Note that JSON does not allow them. - - Ref. ECMAScript section 7.1. - - """ - import unicodedata - txt2 = filter( lambda c: unicodedata.category(unicode(c)) != 'Cf', - txt ) - return txt2 - - - def decode_null(self, s, i=0): - """Intermediate-level decoder for ECMAScript 'null' keyword. - - Takes a string and a starting index, and returns a Python - None object and the index of the next unparsed character. - - """ - if i < len(s) and s[i:i+4] == 'null': - return None, i+4 - raise JSONDecodeError('literal is not the JSON "null" keyword', s) - - def encode_undefined(self): - """Produces the ECMAScript 'undefined' keyword.""" - return 'undefined' - - def encode_null(self): - """Produces the JSON 'null' keyword.""" - return 'null' - - def decode_boolean(self, s, i=0): - """Intermediate-level decode for JSON boolean literals. - - Takes a string and a starting index, and returns a Python bool - (True or False) and the index of the next unparsed character. - - """ - if s[i:i+4] == 'true': - return True, i+4 - elif s[i:i+5] == 'false': - return False, i+5 - raise JSONDecodeError('literal value is not a JSON boolean keyword',s) - - def encode_boolean(self, b): - """Encodes the Python boolean into a JSON Boolean literal.""" - if bool(b): - return 'true' - return 'false' - - def decode_number(self, s, i=0, imax=None): - """Intermediate-level decoder for JSON numeric literals. - - Takes a string and a starting index, and returns a Python - suitable numeric type and the index of the next unparsed character. - - The returned numeric type can be either of a Python int, - long, or float. In addition some special non-numbers may - also be returned such as nan, inf, and neginf (technically - which are Python floats, but have no numeric value.) - - Ref. ECMAScript section 8.5. - - """ - if imax is None: - imax = len(s) - # Detect initial sign character(s) - if not self._allow_all_numeric_signs: - if s[i] == '+' or (s[i] == '-' and i+1 < imax and \ - s[i+1] in '+-'): - raise JSONDecodeError('numbers in strict JSON may only have a single "-" as a sign prefix',s[i:]) - sign = +1 - j = i # j will point after the sign prefix - while j < imax and s[j] in '+-': - if s[j] == '-': sign = sign * -1 - j += 1 - # Check for ECMAScript symbolic non-numbers - if s[j:j+3] == 'NaN': - if self._allow_non_numbers: - return nan, j+3 - else: - raise JSONDecodeError('NaN literals are not allowed in strict JSON') - elif s[j:j+8] == 'Infinity': - if self._allow_non_numbers: - if sign < 0: - return neginf, j+8 - else: - return inf, j+8 - else: - raise JSONDecodeError('Infinity literals are not allowed in strict JSON') - elif s[j:j+2] in ('0x','0X'): - if self._allow_hex_numbers: - k = j+2 - while k < imax and s[k] in hexdigits: - k += 1 - n = sign * decode_hex( s[j+2:k] ) - return n, k - else: - raise JSONDecodeError('hexadecimal literals are not allowed in strict JSON',s[i:]) - else: - # Decimal (or octal) number, find end of number. - # General syntax is: \d+[\.\d+][e[+-]?\d+] - k = j # will point to end of digit sequence - could_be_octal = ( k+1 < imax and s[k] == '0' ) # first digit is 0 - decpt = None # index into number of the decimal point, if any - ept = None # index into number of the e|E exponent start, if any - esign = '+' # sign of exponent - sigdigits = 0 # number of significant digits (approx, counts end zeros) - while k < imax and (s[k].isdigit() or s[k] in '.+-eE'): - c = s[k] - if c not in octaldigits: - could_be_octal = False - if c == '.': - if decpt is not None or ept is not None: - break - else: - decpt = k-j - elif c in 'eE': - if ept is not None: - break - else: - ept = k-j - elif c in '+-': - if not ept: - break - esign = c - else: #digit - if not ept: - sigdigits += 1 - k += 1 - number = s[j:k] # The entire number as a string - #print 'NUMBER IS: ', repr(number), ', sign', sign, ', esign', esign, \ - # ', sigdigits', sigdigits, \ - # ', decpt', decpt, ', ept', ept - - # Handle octal integers first as an exception. If octal - # is not enabled (the ECMAScipt standard) then just do - # nothing and treat the string as a decimal number. - if could_be_octal and self._allow_octal_numbers: - n = sign * decode_octal( number ) - return n, k - - # A decimal number. Do a quick check on JSON syntax restrictions. - if number[0] == '.' and not self._allow_initial_decimal_point: - raise JSONDecodeError('numbers in strict JSON must have at least one digit before the decimal point',s[i:]) - elif number[0] == '0' and \ - len(number) > 1 and number[1].isdigit(): - if self._allow_octal_numbers: - raise JSONDecodeError('initial zero digit is only allowed for octal integers',s[i:]) - else: - raise JSONDecodeError('initial zero digit must not be followed by other digits (octal numbers are not permitted)',s[i:]) - # Make sure decimal point is followed by a digit - if decpt is not None: - if decpt+1 >= len(number) or not number[decpt+1].isdigit(): - raise JSONDecodeError('decimal point must be followed by at least one digit',s[i:]) - # Determine the exponential part - if ept is not None: - if ept+1 >= len(number): - raise JSONDecodeError('exponent in number is truncated',s[i:]) - try: - exponent = int(number[ept+1:]) - except ValueError: - raise JSONDecodeError('not a valid exponent in number',s[i:]) - ##print 'EXPONENT', exponent - else: - exponent = 0 - # Try to make an int/long first. - if decpt is None and exponent >= 0: - # An integer - if ept: - n = int(number[:ept]) - else: - n = int(number) - n *= sign - if exponent: - n *= 10**exponent - if n == 0 and sign < 0: - # minus zero, must preserve negative sign so make a float - n = -0.0 - else: - try: - if decimal and (abs(exponent) > float_maxexp or sigdigits > float_sigdigits): - try: - n = decimal.Decimal(number) - n = n.normalize() - except decimal.Overflow: - if sign<0: - n = neginf - else: - n = inf - else: - n *= sign - else: - n = float(number) * sign - except ValueError: - raise JSONDecodeError('not a valid JSON numeric literal', s[i:j]) - return n, k - - def encode_number(self, n): - """Encodes a Python numeric type into a JSON numeric literal. - - The special non-numeric values of float('nan'), float('inf') - and float('-inf') are translated into appropriate JSON - literals. - - Note that Python complex types are not handled, as there is no - ECMAScript equivalent type. - - """ - if isinstance(n, complex): - if n.imag: - raise JSONEncodeError('Can not encode a complex number that has a non-zero imaginary part',n) - n = n.real - if isinstance(n, (int,long)): - return str(n) - if decimal and isinstance(n, decimal.Decimal): - return str(n) - global nan, inf, neginf - if n is nan: - return 'NaN' - elif n is inf: - return 'Infinity' - elif n is neginf: - return '-Infinity' - elif isinstance(n, float): - # Check for non-numbers. - # In python nan == inf == -inf, so must use repr() to distinguish - reprn = repr(n).lower() - if ('inf' in reprn and '-' in reprn) or n == neginf: - return '-Infinity' - elif 'inf' in reprn or n is inf: - return 'Infinity' - elif 'nan' in reprn or n is nan: - return 'NaN' - return repr(n) - else: - raise TypeError('encode_number expected an integral, float, or decimal number type',type(n)) - - def decode_string(self, s, i=0, imax=None): - """Intermediate-level decoder for JSON string literals. - - Takes a string and a starting index, and returns a Python - string (or unicode string) and the index of the next unparsed - character. - - """ - if imax is None: - imax = len(s) - if imax < i+2 or s[i] not in '"\'': - raise JSONDecodeError('string literal must be properly quoted',s[i:]) - closer = s[i] - if closer == '\'' and not self._allow_single_quoted_strings: - raise JSONDecodeError('string literals must use double quotation marks in strict JSON',s[i:]) - i += 1 # skip quote - if self._allow_js_string_escapes: - escapes = self._escapes_js - else: - escapes = self._escapes_json - ccallowed = self._allow_control_char_in_string - chunks = [] - _append = chunks.append - done = False - high_surrogate = None - while i < imax: - c = s[i] - # Make sure a high surrogate is immediately followed by a low surrogate - if high_surrogate and (i+1 >= imax or s[i:i+2] != '\\u'): - raise JSONDecodeError('High unicode surrogate must be followed by a low surrogate',s[i:]) - if c == closer: - i += 1 # skip end quote - done = True - break - elif c == '\\': - # Escaped character - i += 1 - if i >= imax: - raise JSONDecodeError('escape in string literal is incomplete',s[i-1:]) - c = s[i] - - if '0' <= c <= '7' and self._allow_octal_numbers: - # Handle octal escape codes first so special \0 doesn't kick in yet. - # Follow Annex B.1.2 of ECMAScript standard. - if '0' <= c <= '3': - maxdigits = 3 - else: - maxdigits = 2 - for k in range(i, i+maxdigits+1): - if k >= imax or s[k] not in octaldigits: - break - n = decode_octal(s[i:k]) - if n < 128: - _append( chr(n) ) - else: - _append( unichr(n) ) - i = k - continue - - if escapes.has_key(c): - _append(escapes[c]) - i += 1 - elif c == 'u' or c == 'x': - i += 1 - if c == 'u': - digits = 4 - else: # c== 'x' - if not self._allow_js_string_escapes: - raise JSONDecodeError(r'string literals may not use the \x hex-escape in strict JSON',s[i-1:]) - digits = 2 - if i+digits >= imax: - raise JSONDecodeError('numeric character escape sequence is truncated',s[i-1:]) - n = decode_hex( s[i:i+digits] ) - if high_surrogate: - # Decode surrogate pair and clear high surrogate - _append( surrogate_pair_as_unicode( high_surrogate, unichr(n) ) ) - high_surrogate = None - elif n < 128: - # ASCII chars always go in as a str - _append( chr(n) ) - elif 0xd800 <= n <= 0xdbff: # high surrogate - if imax < i + digits + 2 or s[i+digits] != '\\' or s[i+digits+1] != 'u': - raise JSONDecodeError('High unicode surrogate must be followed by a low surrogate',s[i-2:]) - high_surrogate = unichr(n) # remember until we get to the low surrogate - elif 0xdc00 <= n <= 0xdfff: # low surrogate - raise JSONDecodeError('Low unicode surrogate must be proceeded by a high surrogate',s[i-2:]) - else: - # Other chars go in as a unicode char - _append( unichr(n) ) - i += digits - else: - # Unknown escape sequence - if self._allow_nonescape_characters: - _append( c ) - i += 1 - else: - raise JSONDecodeError('unsupported escape code in JSON string literal',s[i-1:]) - elif ord(c) <= 0x1f: # A control character - if self.islineterm(c): - raise JSONDecodeError('line terminator characters must be escaped inside string literals',s[i:]) - elif ccallowed: - _append( c ) - i += 1 - else: - raise JSONDecodeError('control characters must be escaped inside JSON string literals',s[i:]) - else: # A normal character; not an escape sequence or end-quote. - # Find a whole sequence of "safe" characters so we can append them - # all at once rather than one a time, for speed. - j = i - i += 1 - while i < imax and s[i] not in unsafe_string_chars and s[i] != closer: - i += 1 - _append(s[j:i]) - if not done: - raise JSONDecodeError('string literal is not terminated with a quotation mark',s) - s = ''.join( chunks ) - return s, i - - def encode_string(self, s): - """Encodes a Python string into a JSON string literal. - - """ - # Must handle instances of UserString specially in order to be - # able to use ord() on it's simulated "characters". - import UserString - if isinstance(s, (UserString.UserString, UserString.MutableString)): - def tochar(c): - return c.data - else: - # Could use "lambda c:c", but that is too slow. So we set to None - # and use an explicit if test inside the loop. - tochar = None - - chunks = [] - chunks.append('"') - revesc = self._rev_escapes - asciiencodable = self._asciiencodable - encunicode = self._encode_unicode_as_escapes - i = 0 - imax = len(s) - while i < imax: - if tochar: - c = tochar(s[i]) - else: - c = s[i] - cord = ord(c) - if cord < 256 and asciiencodable[cord] and isinstance(encunicode, bool): - # Contiguous runs of plain old printable ASCII can be copied - # directly to the JSON output without worry (unless the user - # has supplied a custom is-encodable function). - j = i - i += 1 - while i < imax: - if tochar: - c = tochar(s[i]) - else: - c = s[i] - cord = ord(c) - if cord < 256 and asciiencodable[cord]: - i += 1 - else: - break - chunks.append( unicode(s[j:i]) ) - elif revesc.has_key(c): - # Has a shortcut escape sequence, like "\n" - chunks.append(revesc[c]) - i += 1 - elif cord <= 0x1F: - # Always unicode escape ASCII-control characters - chunks.append(r'\u%04x' % cord) - i += 1 - elif 0xD800 <= cord <= 0xDFFF: - # A raw surrogate character! This should never happen - # and there's no way to include it in the JSON output. - # So all we can do is complain. - cname = 'U+%04X' % cord - raise JSONEncodeError('can not include or escape a Unicode surrogate character',cname) - elif cord <= 0xFFFF: - # Other BMP Unicode character - if isinstance(encunicode, bool): - doesc = encunicode - else: - doesc = encunicode( c ) - if doesc: - chunks.append(r'\u%04x' % cord) - else: - chunks.append( c ) - i += 1 - else: # ord(c) >= 0x10000 - # Non-BMP Unicode - if isinstance(encunicode, bool): - doesc = encunicode - else: - doesc = encunicode( c ) - if doesc: - for surrogate in unicode_as_surrogate_pair(c): - chunks.append(r'\u%04x' % ord(surrogate)) - else: - chunks.append( c ) - i += 1 - chunks.append('"') - return ''.join( chunks ) - - def skip_comment(self, txt, i=0): - """Skips an ECMAScript comment, either // or /* style. - - The contents of the comment are returned as a string, as well - as the index of the character immediately after the comment. - - """ - if i+1 >= len(txt) or txt[i] != '/' or txt[i+1] not in '/*': - return None, i - if not self._allow_comments: - raise JSONDecodeError('comments are not allowed in strict JSON',txt[i:]) - multiline = (txt[i+1] == '*') - istart = i - i += 2 - while i < len(txt): - if multiline: - if txt[i] == '*' and i+1 < len(txt) and txt[i+1] == '/': - j = i+2 - break - elif txt[i] == '/' and i+1 < len(txt) and txt[i+1] == '*': - raise JSONDecodeError('multiline /* */ comments may not nest',txt[istart:i+1]) - else: - if self.islineterm(txt[i]): - j = i # line terminator is not part of comment - break - i += 1 - - if i >= len(txt): - if not multiline: - j = len(txt) # // comment terminated by end of file is okay - else: - raise JSONDecodeError('comment was never terminated',txt[istart:]) - return txt[istart:j], j - - def skipws(self, txt, i=0, imax=None, skip_comments=True): - """Skips whitespace. - """ - if not self._allow_comments and not self._allow_unicode_whitespace: - if imax is None: - imax = len(txt) - while i < imax and txt[i] in ' \r\n\t': - i += 1 - return i - else: - return self.skipws_any(txt, i, imax, skip_comments) - - def skipws_any(self, txt, i=0, imax=None, skip_comments=True): - """Skips all whitespace, including comments and unicode whitespace - - Takes a string and a starting index, and returns the index of the - next non-whitespace character. - - If skip_comments is True and not running in strict JSON mode, then - comments will be skipped over just like whitespace. - - """ - if imax is None: - imax = len(txt) - while i < imax: - if txt[i] == '/': - cmt, i = self.skip_comment(txt, i) - if i < imax and self.isws(txt[i]): - i += 1 - else: - break - return i - - def decode_composite(self, txt, i=0, imax=None): - """Intermediate-level JSON decoder for composite literal types (array and object). - - Takes text and a starting index, and returns either a Python list or - dictionary and the index of the next unparsed character. - - """ - if imax is None: - imax = len(txt) - i = self.skipws(txt, i, imax) - starti = i - if i >= imax or txt[i] not in '{[': - raise JSONDecodeError('composite object must start with "[" or "{"',txt[i:]) - if txt[i] == '[': - isdict = False - closer = ']' - obj = [] - else: - isdict = True - closer = '}' - obj = {} - i += 1 # skip opener - i = self.skipws(txt, i, imax) - - if i < imax and txt[i] == closer: - # empty composite - i += 1 - done = True - else: - saw_value = False # set to false at beginning and after commas - done = False - while i < imax: - i = self.skipws(txt, i, imax) - if i < imax and (txt[i] == ',' or txt[i] == closer): - c = txt[i] - i += 1 - if c == ',': - if not saw_value: - # no preceeding value, an elided (omitted) element - if isdict: - raise JSONDecodeError('can not omit elements of an object (dictionary)') - if self._allow_omitted_array_elements: - if self._allow_undefined_values: - obj.append( undefined ) - else: - obj.append( None ) - else: - raise JSONDecodeError('strict JSON does not permit omitted array (list) elements',txt[i:]) - saw_value = False - continue - else: # c == closer - if not saw_value and not self._allow_trailing_comma_in_literal: - if isdict: - raise JSONDecodeError('strict JSON does not allow a final comma in an object (dictionary) literal',txt[i-2:]) - else: - raise JSONDecodeError('strict JSON does not allow a final comma in an array (list) literal',txt[i-2:]) - done = True - break - - # Decode the item - if isdict and self._allow_nonstring_keys: - r = self.decodeobj(txt, i, identifier_as_string=True) - else: - r = self.decodeobj(txt, i, identifier_as_string=False) - if r: - if saw_value: - # two values without a separating comma - raise JSONDecodeError('values must be separated by a comma', txt[i:r[1]]) - saw_value = True - i = self.skipws(txt, r[1], imax) - if isdict: - key = r[0] # Ref 11.1.5 - if not isstringtype(key): - if isnumbertype(key): - if not self._allow_nonstring_keys: - raise JSONDecodeError('strict JSON only permits string literals as object properties (dictionary keys)',txt[starti:]) - else: - raise JSONDecodeError('object properties (dictionary keys) must be either string literals or numbers',txt[starti:]) - if i >= imax or txt[i] != ':': - raise JSONDecodeError('object property (dictionary key) has no value, expected ":"',txt[starti:]) - i += 1 - i = self.skipws(txt, i, imax) - rval = self.decodeobj(txt, i) - if rval: - i = self.skipws(txt, rval[1], imax) - obj[key] = rval[0] - else: - raise JSONDecodeError('object property (dictionary key) has no value',txt[starti:]) - else: # list - obj.append( r[0] ) - else: # not r - if isdict: - raise JSONDecodeError('expected a value, or "}"',txt[i:]) - elif not self._allow_omitted_array_elements: - raise JSONDecodeError('expected a value or "]"',txt[i:]) - else: - raise JSONDecodeError('expected a value, "," or "]"',txt[i:]) - # end while - if not done: - if isdict: - raise JSONDecodeError('object literal (dictionary) is not terminated',txt[starti:]) - else: - raise JSONDecodeError('array literal (list) is not terminated',txt[starti:]) - return obj, i - - def decode_javascript_identifier(self, name): - """Convert a JavaScript identifier into a Python string object. - - This method can be overriden by a subclass to redefine how JavaScript - identifiers are turned into Python objects. By default this just - converts them into strings. - - """ - return name - - def decodeobj(self, txt, i=0, imax=None, identifier_as_string=False, only_object_or_array=False): - """Intermediate-level JSON decoder. - - Takes a string and a starting index, and returns a two-tuple consting - of a Python object and the index of the next unparsed character. - - If there is no value at all (empty string, etc), the None is - returned instead of a tuple. - - """ - if imax is None: - imax = len(txt) - obj = None - i = self.skipws(txt, i, imax) - if i >= imax: - raise JSONDecodeError('Unexpected end of input') - c = txt[i] - - if c == '[' or c == '{': - obj, i = self.decode_composite(txt, i, imax) - elif only_object_or_array: - raise JSONDecodeError('JSON document must start with an object or array type only', txt[i:i+20]) - elif c == '"' or c == '\'': - obj, i = self.decode_string(txt, i, imax) - elif c.isdigit() or c in '.+-': - obj, i = self.decode_number(txt, i, imax) - elif c.isalpha() or c in'_$': - j = i - while j < imax and (txt[j].isalnum() or txt[j] in '_$'): - j += 1 - kw = txt[i:j] - if kw == 'null': - obj, i = None, j - elif kw == 'true': - obj, i = True, j - elif kw == 'false': - obj, i = False, j - elif kw == 'undefined': - if self._allow_undefined_values: - obj, i = undefined, j - else: - raise JSONDecodeError('strict JSON does not allow undefined elements',txt[i:]) - elif kw == 'NaN' or kw == 'Infinity': - obj, i = self.decode_number(txt, i) - else: - if identifier_as_string: - obj, i = self.decode_javascript_identifier(kw), j - else: - raise JSONDecodeError('unknown keyword or identifier',kw) - else: - raise JSONDecodeError('can not decode value',txt[i:]) - return obj, i - - - - def decode(self, txt): - """Decodes a JSON-endoded string into a Python object.""" - if self._allow_unicode_format_control_chars: - txt = self.strip_format_control_chars(txt) - r = self.decodeobj(txt, 0, only_object_or_array=not self._allow_any_type_at_start) - if not r: - raise JSONDecodeError('can not decode value',txt) - else: - obj, i = r - i = self.skipws(txt, i) - if i < len(txt): - raise JSONDecodeError('unexpected or extra text',txt[i:]) - return obj - - def encode(self, obj, nest_level=0): - """Encodes the Python object into a JSON string representation. - - This method will first attempt to encode an object by seeing - if it has a json_equivalent() method. If so than it will - call that method and then recursively attempt to encode - the object resulting from that call. - - Next it will attempt to determine if the object is a native - type or acts like a squence or dictionary. If so it will - encode that object directly. - - Finally, if no other strategy for encoding the object of that - type exists, it will call the encode_default() method. That - method currently raises an error, but it could be overridden - by subclasses to provide a hook for extending the types which - can be encoded. - - """ - chunks = [] - self.encode_helper(chunks, obj, nest_level) - return ''.join( chunks ) - - def encode_helper(self, chunklist, obj, nest_level): - #print 'encode_helper(chunklist=%r, obj=%r, nest_level=%r)'%(chunklist,obj,nest_level) - if hasattr(obj, 'json_equivalent'): - json = self.encode_equivalent( obj, nest_level=nest_level ) - if json is not None: - chunklist.append( json ) - return - if obj is None: - chunklist.append( self.encode_null() ) - elif obj is undefined: - if self._allow_undefined_values: - chunklist.append( self.encode_undefined() ) - else: - raise JSONEncodeError('strict JSON does not permit "undefined" values') - elif isinstance(obj, bool): - chunklist.append( self.encode_boolean(obj) ) - elif isinstance(obj, (int,long,float,complex)) or \ - (decimal and isinstance(obj, decimal.Decimal)): - chunklist.append( self.encode_number(obj) ) - elif isinstance(obj, basestring) or isstringtype(obj): - chunklist.append( self.encode_string(obj) ) - else: - self.encode_composite(chunklist, obj, nest_level) - - def encode_composite(self, chunklist, obj, nest_level): - """Encodes just dictionaries, lists, or sequences. - - Basically handles any python type for which iter() can create - an iterator object. - - This method is not intended to be called directly. Use the - encode() method instead. - - """ - #print 'encode_complex_helper(chunklist=%r, obj=%r, nest_level=%r)'%(chunklist,obj,nest_level) - try: - # Is it a dictionary or UserDict? Try iterkeys method first. - it = obj.iterkeys() - except AttributeError: - try: - # Is it a sequence? Try to make an iterator for it. - it = iter(obj) - except TypeError: - it = None - if it is not None: - # Does it look like a dictionary? Check for a minimal dict or - # UserDict interface. - isdict = hasattr(obj, '__getitem__') and hasattr(obj, 'keys') - compactly = self._encode_compactly - if isdict: - chunklist.append('{') - if compactly: - dictcolon = ':' - else: - dictcolon = ' : ' - else: - chunklist.append('[') - #print nest_level, 'opening sequence:', repr(chunklist) - if not compactly: - indent0 = ' ' * nest_level - indent = ' ' * (nest_level+1) - chunklist.append(' ') - sequence_chunks = [] # use this to allow sorting afterwards if dict - try: # while not StopIteration - numitems = 0 - while True: - obj2 = it.next() - if obj2 is obj: - raise JSONEncodeError('trying to encode an infinite sequence',obj) - if isdict and not isstringtype(obj2): - # Check JSON restrictions on key types - if isnumbertype(obj2): - if not self._allow_nonstring_keys: - raise JSONEncodeError('object properties (dictionary keys) must be strings in strict JSON',obj2) - else: - raise JSONEncodeError('object properties (dictionary keys) can only be strings or numbers in ECMAScript',obj2) - - # Encode this item in the sequence and put into item_chunks - item_chunks = [] - self.encode_helper( item_chunks, obj2, nest_level=nest_level+1 ) - if isdict: - item_chunks.append(dictcolon) - obj3 = obj[obj2] - self.encode_helper(item_chunks, obj3, nest_level=nest_level+2) - - #print nest_level, numitems, 'item:', repr(obj2) - #print nest_level, numitems, 'sequence_chunks:', repr(sequence_chunks) - #print nest_level, numitems, 'item_chunks:', repr(item_chunks) - #extend_list_with_sep(sequence_chunks, item_chunks) - sequence_chunks.append(item_chunks) - #print nest_level, numitems, 'new sequence_chunks:', repr(sequence_chunks) - numitems += 1 - except StopIteration: - pass - - if isdict and self._sort_dictionary_keys: - sequence_chunks.sort() # Note sorts by JSON repr, not original Python object - if compactly: - sep = ',' - else: - sep = ',\n' + indent - - #print nest_level, 'closing sequence' - #print nest_level, 'chunklist:', repr(chunklist) - #print nest_level, 'sequence_chunks:', repr(sequence_chunks) - extend_and_flatten_list_with_sep( chunklist, sequence_chunks, sep ) - #print nest_level, 'new chunklist:', repr(chunklist) - - if not compactly: - if numitems > 1: - chunklist.append('\n' + indent0) - else: - chunklist.append(' ') - if isdict: - chunklist.append('}') - else: - chunklist.append(']') - else: # Can't create an iterator for the object - json2 = self.encode_default( obj, nest_level=nest_level ) - chunklist.append( json2 ) - - def encode_equivalent( self, obj, nest_level=0 ): - """This method is used to encode user-defined class objects. - - The object being encoded should have a json_equivalent() - method defined which returns another equivalent object which - is easily JSON-encoded. If the object in question has no - json_equivalent() method available then None is returned - instead of a string so that the encoding will attempt the next - strategy. - - If a caller wishes to disable the calling of json_equivalent() - methods, then subclass this class and override this method - to just return None. - - """ - if hasattr(obj, 'json_equivalent') \ - and callable(getattr(obj,'json_equivalent')): - obj2 = obj.json_equivalent() - if obj2 is obj: - # Try to prevent careless infinite recursion - raise JSONEncodeError('object has a json_equivalent() method that returns itself',obj) - json2 = self.encode( obj2, nest_level=nest_level ) - return json2 - else: - return None - - def encode_default( self, obj, nest_level=0 ): - """This method is used to encode objects into JSON which are not straightforward. - - This method is intended to be overridden by subclasses which wish - to extend this encoder to handle additional types. - - """ - raise JSONEncodeError('can not encode object into a JSON representation',obj) - - -# ------------------------------ - -def encode( obj, strict=False, compactly=True, escape_unicode=False, encoding=None ): - """Encodes a Python object into a JSON-encoded string. - - If 'strict' is set to True, then only strictly-conforming JSON - output will be produced. Note that this means that some types - of values may not be convertable and will result in a - JSONEncodeError exception. - - If 'compactly' is set to True, then the resulting string will - have all extraneous white space removed; if False then the - string will be "pretty printed" with whitespace and indentation - added to make it more readable. - - If 'escape_unicode' is set to True, then all non-ASCII characters - will be represented as a unicode escape sequence; if False then - the actual real unicode character will be inserted. - - If no encoding is specified (encoding=None) then the output will - either be a Python string (if entirely ASCII) or a Python unicode - string type. - - However if an encoding name is given then the returned value will - be a python string which is the byte sequence encoding the JSON - value. As the default/recommended encoding for JSON is UTF-8, - you should almost always pass in encoding='utf8'. - - """ - import sys - encoder = None # Custom codec encoding function - bom = None # Byte order mark to prepend to final output - cdk = None # Codec to use - if encoding is not None: - import codecs - try: - cdk = codecs.lookup(encoding) - except LookupError: - cdk = None - - if cdk: - pass - elif not cdk: - # No built-in codec was found, see if it is something we - # can do ourself. - encoding = encoding.lower() - if encoding.startswith('utf-32') or encoding.startswith('utf32') \ - or encoding.startswith('ucs4') \ - or encoding.startswith('ucs-4'): - # Python doesn't natively have a UTF-32 codec, but JSON - # requires that it be supported. So we must decode these - # manually. - if encoding.endswith('le'): - encoder = utf32le_encode - elif encoding.endswith('be'): - encoder = utf32be_encode - else: - encoder = utf32be_encode - bom = codecs.BOM_UTF32_BE - elif encoding.startswith('ucs2') or encoding.startswith('ucs-2'): - # Python has no UCS-2, but we can simulate with - # UTF-16. We just need to force us to not try to - # encode anything past the BMP. - encoding = 'utf-16' - if not escape_unicode and not callable(escape_unicode): - escape_unicode = lambda c: (0xD800 <= ord(c) <= 0xDFFF) or ord(c) >= 0x10000 - else: - raise JSONEncodeError('this python has no codec for this character encoding',encoding) - - if not escape_unicode and not callable(escape_unicode): - if encoding and encoding.startswith('utf'): - # All UTF-x encodings can do the whole Unicode repertoire, so - # do nothing special. - pass - else: - # Even though we don't want to escape all unicode chars, - # the encoding being used may force us to do so anyway. - # We must pass in a function which says which characters - # the encoding can handle and which it can't. - def in_repertoire( c, encoding_func ): - try: - x = encoding_func( c, errors='strict' ) - except UnicodeError: - return False - return True - if encoder: - escape_unicode = lambda c: not in_repertoire(c, encoder) - elif cdk: - escape_unicode = lambda c: not in_repertoire(c, cdk[0]) - else: - pass # Let the JSON object deal with it - - j = JSON( strict=strict, compactly=compactly, escape_unicode=escape_unicode ) - - unitxt = j.encode( obj ) - if encoder: - txt = encoder( unitxt ) - elif encoding is not None: - txt = unitxt.encode( encoding ) - else: - txt = unitxt - if bom: - txt = bom + txt - return txt - - -def decode( txt, strict=False, encoding=None, **kw ): - """Decodes a JSON-encoded string into a Python object. - - If 'strict' is set to True, then those strings that are not - entirely strictly conforming to JSON will result in a - JSONDecodeError exception. - - The input string can be either a python string or a python unicode - string. If it is already a unicode string, then it is assumed - that no character set decoding is required. - - However, if you pass in a non-Unicode text string (i.e., a python - type 'str') then an attempt will be made to auto-detect and decode - the character encoding. This will be successful if the input was - encoded in any of UTF-8, UTF-16 (BE or LE), or UTF-32 (BE or LE), - and of course plain ASCII works too. - - Note though that if you know the character encoding, then you - should convert to a unicode string yourself, or pass it the name - of the 'encoding' to avoid the guessing made by the auto - detection, as with - - python_object = demjson.decode( input_bytes, encoding='utf8' ) - - Optional keywords arguments must be of the form - allow_xxxx=True/False - or - prevent_xxxx=True/False - where each will allow or prevent the specific behavior, after the - evaluation of the 'strict' argument. For example, if strict=True - then by also passing 'allow_comments=True' then comments will be - allowed. If strict=False then prevent_comments=True will allow - everything except comments. - - """ - # Initialize the JSON object - j = JSON( strict=strict ) - for keyword, value in kw.items(): - if keyword.startswith('allow_'): - behavior = keyword[6:] - allow = bool(value) - elif keyword.startswith('prevent_'): - behavior = keyword[8:] - allow = not bool(value) - else: - raise ValueError('unknown keyword argument', keyword) - if allow: - j.allow(behavior) - else: - j.prevent(behavior) - - # Convert the input string into unicode if needed. - if isinstance(txt,unicode): - unitxt = txt - else: - if encoding is None: - unitxt = auto_unicode_decode( txt ) - else: - cdk = None # codec - decoder = None - import codecs - try: - cdk = codecs.lookup(encoding) - except LookupError: - encoding = encoding.lower() - decoder = None - if encoding.startswith('utf-32') \ - or encoding.startswith('ucs4') \ - or encoding.startswith('ucs-4'): - # Python doesn't natively have a UTF-32 codec, but JSON - # requires that it be supported. So we must decode these - # manually. - if encoding.endswith('le'): - decoder = utf32le_decode - elif encoding.endswith('be'): - decoder = utf32be_decode - else: - if txt.startswith( codecs.BOM_UTF32_BE ): - decoder = utf32be_decode - txt = txt[4:] - elif txt.startswith( codecs.BOM_UTF32_LE ): - decoder = utf32le_decode - txt = txt[4:] - else: - if encoding.startswith('ucs'): - raise JSONDecodeError('UCS-4 encoded string must start with a BOM') - decoder = utf32be_decode # Default BE for UTF, per unicode spec - elif encoding.startswith('ucs2') or encoding.startswith('ucs-2'): - # Python has no UCS-2, but we can simulate with - # UTF-16. We just need to force us to not try to - # encode anything past the BMP. - encoding = 'utf-16' - - if decoder: - unitxt = decoder(txt) - elif encoding: - unitxt = txt.decode(encoding) - else: - raise JSONDecodeError('this python has no codec for this character encoding',encoding) - - # Check that the decoding seems sane. Per RFC 4627 section 3: - # "Since the first two characters of a JSON text will - # always be ASCII characters [RFC0020], ..." - # - # This check is probably not necessary, but it allows us to - # raise a suitably descriptive error rather than an obscure - # syntax error later on. - # - # Note that the RFC requirements of two ASCII characters seems - # to be an incorrect statement as a JSON string literal may - # have as it's first character any unicode character. Thus - # the first two characters will always be ASCII, unless the - # first character is a quotation mark. And in non-strict - # mode we can also have a few other characters too. - if len(unitxt) > 2: - first, second = unitxt[:2] - if first in '"\'': - pass # second can be anything inside string literal - else: - if ((ord(first) < 0x20 or ord(first) > 0x7f) or \ - (ord(second) < 0x20 or ord(second) > 0x7f)) and \ - (not j.isws(first) and not j.isws(second)): - # Found non-printable ascii, must check unicode - # categories to see if the character is legal. - # Only whitespace, line and paragraph separators, - # and format control chars are legal here. - import unicodedata - catfirst = unicodedata.category(unicode(first)) - catsecond = unicodedata.category(unicode(second)) - if catfirst not in ('Zs','Zl','Zp','Cf') or \ - catsecond not in ('Zs','Zl','Zp','Cf'): - raise JSONDecodeError('the decoded string is gibberish, is the encoding correct?',encoding) - # Now ready to do the actual decoding - obj = j.decode( unitxt ) - return obj - -# end file diff --git a/cgi-bin/load_question.py b/cgi-bin/load_question.py index 1dc26abdf..b61f46562 100755 --- a/cgi-bin/load_question.py +++ b/cgi-bin/load_question.py @@ -1,4 +1,4 @@ -#!/usr/bin/python2.5 +#!/usr/bin/python2.6 # Online Python Tutor # https://github.com/pgbovine/OnlinePythonTutor/ diff --git a/cgi-bin/pg_logger.py b/cgi-bin/pg_logger.py index 80eab9784..673c3dbf6 100644 --- a/cgi-bin/pg_logger.py +++ b/cgi-bin/pg_logger.py @@ -28,7 +28,7 @@ # Python debugger imported via the bdb module), printing out the values # of all in-scope data structures after each executed instruction. -# Note that I've only tested this logger on Python 2.5, so it will +# Note that I've only tested this logger on Python 2.6, so it will # probably fail in subtle ways on other Python 2.X (and will DEFINITELY # fail on Python 3.X). diff --git a/cgi-bin/web_exec.py b/cgi-bin/web_exec.py index b7c397865..9debc60ec 100755 --- a/cgi-bin/web_exec.py +++ b/cgi-bin/web_exec.py @@ -1,4 +1,4 @@ -#!/usr/bin/python2.5 +#!/usr/bin/python2.6 # Online Python Tutor # https://github.com/pgbovine/OnlinePythonTutor/ @@ -31,8 +31,8 @@ # # Returns a complete JSON execution trace to the front-end. # -# This version uses Python 2.5 on the MIT CSAIL servers. -# (note that Python 2.4 doesn't work on CSAIL, but Python 2.5 does) +# This version uses Python 2.6 on the MIT CSAIL servers. +# (note that Python 2.4 doesn't work on CSAIL, but Python 2.6 does) # # If you want to run this script, then you'll need to change the # shebang line at the top of this file to point to your system's Python. @@ -50,9 +50,7 @@ import cgi import pg_logger -# Python 2.5 doesn't have a built-in json module, so I'm using a -# 3rd-party module. I think you can do 'import json' in Python >= 2.6 -import demjson +import json if LOG_QUERIES: import os, time, db_common @@ -60,7 +58,7 @@ def web_finalizer(output_lst): # use compactly=False to produce human-readable JSON, # except at the expense of being a LARGER download - output_json = demjson.encode(output_lst, compactly=True) + output_json = json.dumps(output_lst) # query logging is optional if LOG_QUERIES: diff --git a/cgi-bin/web_run_test.py b/cgi-bin/web_run_test.py index 6c67ebd5a..4d932f37a 100755 --- a/cgi-bin/web_run_test.py +++ b/cgi-bin/web_run_test.py @@ -1,4 +1,4 @@ -#!/usr/bin/python2.5 +#!/usr/bin/python2.6 # Online Python Tutor # https://github.com/pgbovine/OnlinePythonTutor/ @@ -33,9 +33,7 @@ import cgi import pg_logger -# Python 2.5 doesn't have a built-in json module, so I'm using a -# 3rd-party module. I think you can do 'import json' in Python >= 2.6 -import demjson +import json user_trace = None # the FULL user trace (without any IDs, though) expect_trace_final_entry = None @@ -67,7 +65,7 @@ def expect_script_finalizer(output_lst): # Crucial first line to make sure that Apache serves this data # correctly - DON'T FORGET THE EXTRA NEWLINES!!!: print "Content-type: text/plain; charset=iso-8859-1\n\n" - output_json = demjson.encode(ret, compactly=True) + output_json = json.dumps(ret) print output_json else: diff --git a/question.html b/question.html index 16fd8bf78..3a21e8cfd 100644 --- a/question.html +++ b/question.html @@ -202,7 +202,7 @@

This application supports the core Python 2.5 language, with no +href="http://docs.python.org/release/2.6/">Python 2.6 language, with no module imports or file I/O. It's meant to be used as a platform for creating programming tutorials, not for running or debugging production code. diff --git a/tutor.html b/tutor.html index 2027c9de5..33e9b8ec5 100644 --- a/tutor.html +++ b/tutor.html @@ -197,7 +197,7 @@

This application supports the core Python 2.5 language, with no +href="http://docs.python.org/release/2.6/">Python 2.6 language, with no module imports or file I/O. It's meant to be used as a platform for creating programming tutorials, not for running or debugging production code. From 588a148b40a4f3f7039546f8d7ad4ef403cb3490 Mon Sep 17 00:00:00 2001 From: Philip Guo Date: Mon, 16 Jul 2012 21:30:37 -0700 Subject: [PATCH 005/502] get rid of jquery.textarea.js --- jquery.textarea.js | 260 --------------------------------------------- question.html | 2 - tutor.html | 2 - 3 files changed, 264 deletions(-) delete mode 100644 jquery.textarea.js diff --git a/jquery.textarea.js b/jquery.textarea.js deleted file mode 100644 index cd8acd5e4..000000000 --- a/jquery.textarea.js +++ /dev/null @@ -1,260 +0,0 @@ -// include this file AFTER including jQuery - -/* - * Tabby jQuery plugin version 0.12 - * - * Ted Devito - http://teddevito.com/demos/textarea.html - * - * You should have received a copy of the GNU General Public License - * along with Easy Widgets. If not, see - * - * Plugin development pattern based on: http://www.learningjquery.com/2007/10/a-plugin-development-pattern - * - */ - -// create closure - -(function($) { - - // plugin definition - - $.fn.tabby = function(options) { - //debug(this); - // build main options before element iteration - var opts = $.extend({}, $.fn.tabby.defaults, options); - var pressed = $.fn.tabby.pressed; - - // iterate and reformat each matched element - return this.each(function() { - $this = $(this); - - // build element specific options - var options = $.meta ? $.extend({}, opts, $this.data()) : opts; - - $this.bind('keydown',function (e) { - var kc = $.fn.tabby.catch_kc(e); - if (16 == kc) pressed.shft = true; - /* - because both CTRL+TAB and ALT+TAB default to an event (changing tab/window) that - will prevent js from capturing the keyup event, we'll set a timer on releasing them. - */ - if (17 == kc) {pressed.ctrl = true; setTimeout("$.fn.tabby.pressed.ctrl = false;",1000);} - if (18 == kc) {pressed.alt = true; setTimeout("$.fn.tabby.pressed.alt = false;",1000);} - - if (9 == kc && !pressed.ctrl && !pressed.alt) { - e.preventDefault; // does not work in O9.63 ?? - pressed.last = kc; setTimeout("$.fn.tabby.pressed.last = null;",0); - process_keypress ($(e.target).get(0), pressed.shft, options); - return false; - } - - }).bind('keyup',function (e) { - if (16 == $.fn.tabby.catch_kc(e)) pressed.shft = false; - }).bind('blur',function (e) { // workaround for Opera -- http://www.webdeveloper.com/forum/showthread.php?p=806588 - if (9 == pressed.last) $(e.target).one('focus',function (e) {pressed.last = null;}).get(0).focus(); - }); - - }); - }; - - // define and expose any extra methods - $.fn.tabby.catch_kc = function(e) { return e.keyCode ? e.keyCode : e.charCode ? e.charCode : e.which; }; - $.fn.tabby.pressed = {shft : false, ctrl : false, alt : false, last: null}; - - // private function for debugging - function debug($obj) { - if (window.console && window.console.log) - window.console.log('textarea count: ' + $obj.size()); - }; - - function process_keypress (o,shft,options) { - var scrollTo = o.scrollTop; - //var tabString = String.fromCharCode(9); - - // gecko; o.setSelectionRange is only available when the text box has focus - if (o.setSelectionRange) gecko_tab (o, shft, options); - - // ie; document.selection is always available - else if (document.selection) ie_tab (o, shft, options); - - o.scrollTop = scrollTo; - } - - // plugin defaults - //$.fn.tabby.defaults = {tabString : String.fromCharCode(9)}; - // modified by pgbovine: - $.fn.tabby.defaults = {tabString : ' '}; - - function gecko_tab (o, shft, options) { - var ss = o.selectionStart; - var es = o.selectionEnd; - - // when there's no selection and we're just working with the caret, we'll add/remove the tabs at the caret, providing more control - if(ss == es) { - // SHIFT+TAB - if (shft) { - // check to the left of the caret first - //if ("\t" == o.value.substring(ss-options.tabString.length, ss)) { - // modified by pgbovine: - if (" " == o.value.substring(ss-options.tabString.length, ss)) { - o.value = o.value.substring(0, ss-options.tabString.length) + o.value.substring(ss); // put it back together omitting one character to the left - o.focus(); - o.setSelectionRange(ss - options.tabString.length, ss - options.tabString.length); - } - // then check to the right of the caret - else if ("\t" == o.value.substring(ss, ss + options.tabString.length)) { - o.value = o.value.substring(0, ss) + o.value.substring(ss + options.tabString.length); // put it back together omitting one character to the right - o.focus(); - o.setSelectionRange(ss,ss); - } - } - // TAB - else { - o.value = o.value.substring(0, ss) + options.tabString + o.value.substring(ss); - o.focus(); - o.setSelectionRange(ss + options.tabString.length, ss + options.tabString.length); - } - } - // selections will always add/remove tabs from the start of the line - else { - // split the textarea up into lines and figure out which lines are included in the selection - var lines = o.value.split("\n"); - var indices = new Array(); - var sl = 0; // start of the line - var el = 0; // end of the line - var sel = false; - for (var i in lines) { - el = sl + lines[i].length; - indices.push({start: sl, end: el, selected: (sl <= ss && el > ss) || (el >= es && sl < es) || (sl > ss && el < es)}); - sl = el + 1;// for "\n" - } - - // walk through the array of lines (indices) and add tabs where appropriate - var modifier = 0; - for (var i in indices) { - if (indices[i].selected) { - var pos = indices[i].start + modifier; // adjust for tabs already inserted/removed - // SHIFT+TAB - if (shft && options.tabString == o.value.substring(pos,pos+options.tabString.length)) { // only SHIFT+TAB if there's a tab at the start of the line - o.value = o.value.substring(0,pos) + o.value.substring(pos + options.tabString.length); // omit the tabstring to the right - modifier -= options.tabString.length; - } - // TAB - else if (!shft) { - o.value = o.value.substring(0,pos) + options.tabString + o.value.substring(pos); // insert the tabstring - modifier += options.tabString.length; - } - } - } - o.focus(); - var ns = ss + ((modifier > 0) ? options.tabString.length : (modifier < 0) ? -options.tabString.length : 0); - var ne = es + modifier; - o.setSelectionRange(ns,ne); - } - } - - function ie_tab (o, shft, options) { - var range = document.selection.createRange(); - - if (o == range.parentElement()) { - // when there's no selection and we're just working with the caret, we'll add/remove the tabs at the caret, providing more control - if ('' == range.text) { - // SHIFT+TAB - if (shft) { - var bookmark = range.getBookmark(); - //first try to the left by moving opening up our empty range to the left - range.moveStart('character', -options.tabString.length); - if (options.tabString == range.text) { - range.text = ''; - } else { - // if that didn't work then reset the range and try opening it to the right - range.moveToBookmark(bookmark); - range.moveEnd('character', options.tabString.length); - if (options.tabString == range.text) - range.text = ''; - } - // move the pointer to the start of them empty range and select it - range.collapse(true); - range.select(); - } - - else { - // very simple here. just insert the tab into the range and put the pointer at the end - range.text = options.tabString; - range.collapse(false); - range.select(); - } - } - // selections will always add/remove tabs from the start of the line - else { - - var selection_text = range.text; - var selection_len = selection_text.length; - var selection_arr = selection_text.split("\r\n"); - - var before_range = document.body.createTextRange(); - before_range.moveToElementText(o); - before_range.setEndPoint("EndToStart", range); - var before_text = before_range.text; - var before_arr = before_text.split("\r\n"); - var before_len = before_text.length; // - before_arr.length + 1; - - var after_range = document.body.createTextRange(); - after_range.moveToElementText(o); - after_range.setEndPoint("StartToEnd", range); - var after_text = after_range.text; // we can accurately calculate distance to the end because we're not worried about MSIE trimming a \r\n - - var end_range = document.body.createTextRange(); - end_range.moveToElementText(o); - end_range.setEndPoint("StartToEnd", before_range); - var end_text = end_range.text; // we can accurately calculate distance to the end because we're not worried about MSIE trimming a \r\n - - var check_html = $(o).html(); - $("#r3").text(before_len + " + " + selection_len + " + " + after_text.length + " = " + check_html.length); - if((before_len + end_text.length) < check_html.length) { - before_arr.push(""); - before_len += 2; // for the \r\n that was trimmed - if (shft && options.tabString == selection_arr[0].substring(0,options.tabString.length)) - selection_arr[0] = selection_arr[0].substring(options.tabString.length); - else if (!shft) selection_arr[0] = options.tabString + selection_arr[0]; - } else { - if (shft && options.tabString == before_arr[before_arr.length-1].substring(0,options.tabString.length)) - before_arr[before_arr.length-1] = before_arr[before_arr.length-1].substring(options.tabString.length); - else if (!shft) before_arr[before_arr.length-1] = options.tabString + before_arr[before_arr.length-1]; - } - - for (var i = 1; i < selection_arr.length; i++) { - if (shft && options.tabString == selection_arr[i].substring(0,options.tabString.length)) - selection_arr[i] = selection_arr[i].substring(options.tabString.length); - else if (!shft) selection_arr[i] = options.tabString + selection_arr[i]; - } - - if (1 == before_arr.length && 0 == before_len) { - if (shft && options.tabString == selection_arr[0].substring(0,options.tabString.length)) - selection_arr[0] = selection_arr[0].substring(options.tabString.length); - else if (!shft) selection_arr[0] = options.tabString + selection_arr[0]; - } - - if ((before_len + selection_len + after_text.length) < check_html.length) { - selection_arr.push(""); - selection_len += 2; // for the \r\n that was trimmed - } - - before_range.text = before_arr.join("\r\n"); - range.text = selection_arr.join("\r\n"); - - var new_range = document.body.createTextRange(); - new_range.moveToElementText(o); - - if (0 < before_len) new_range.setEndPoint("StartToEnd", before_range); - else new_range.setEndPoint("StartToStart", before_range); - new_range.setEndPoint("EndToEnd", range); - - new_range.select(); - - } - } - } - -// end of closure -})(jQuery); diff --git a/question.html b/question.html index 3a21e8cfd..59ac818b9 100644 --- a/question.html +++ b/question.html @@ -47,8 +47,6 @@ - - diff --git a/tutor.html b/tutor.html index 33e9b8ec5..2fe743869 100644 --- a/tutor.html +++ b/tutor.html @@ -52,8 +52,6 @@ - - From 7219a428a96c5b77a94efb88b7faa243e96ab286 Mon Sep 17 00:00:00 2001 From: Philip Guo Date: Mon, 16 Jul 2012 21:35:23 -0700 Subject: [PATCH 006/502] minor --- edu-python-tutor.js | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/edu-python-tutor.js b/edu-python-tutor.js index 66cf4e84e..7793f7818 100644 --- a/edu-python-tutor.js +++ b/edu-python-tutor.js @@ -47,7 +47,8 @@ function enterVisualizeMode(traceData) { $(document).ready(function() { eduPythonCommonInit(); // must call this first! - $("#pyInput").tabby(); // recognize TAB and SHIFT-TAB + // this doesn't work since we need jquery.textarea.js ... + //$("#pyInput").tabby(); // recognize TAB and SHIFT-TAB // be friendly to the browser's forward and back buttons From 43b6cc269a8290760583957816795cafe57360e7 Mon Sep 17 00:00:00 2001 From: Philip Guo Date: Mon, 16 Jul 2012 21:38:47 -0700 Subject: [PATCH 007/502] eliminated tabby calls --- edu-python-questions.js | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/edu-python-questions.js b/edu-python-questions.js index 545caab1f..7c1933a21 100644 --- a/edu-python-questions.js +++ b/edu-python-questions.js @@ -59,8 +59,9 @@ function resetTestResults() { $(document).ready(function() { eduPythonCommonInit(); // must call this first! - $("#actualCodeInput").tabby(); // recognize TAB and SHIFT-TAB - $("#testCodeInput").tabby(); // recognize TAB and SHIFT-TAB + // this doesn't work since we need jquery.textarea.js ... + //$("#actualCodeInput").tabby(); // recognize TAB and SHIFT-TAB + //$("#testCodeInput").tabby(); // recognize TAB and SHIFT-TAB // be friendly to the browser's forward and back buttons From 3a26ed29b853c99e5a29a0f46d46919c92868fc2 Mon Sep 17 00:00:00 2001 From: Philip Guo Date: Mon, 16 Jul 2012 21:41:12 -0700 Subject: [PATCH 008/502] more getting rid of demjson --- cgi-bin/load_question.py | 4 ++-- cgi-bin/run_tests.py | 3 +-- cgi-bin/web_run_test.py | 2 +- 3 files changed, 4 insertions(+), 5 deletions(-) diff --git a/cgi-bin/load_question.py b/cgi-bin/load_question.py index b61f46562..38a42f827 100755 --- a/cgi-bin/load_question.py +++ b/cgi-bin/load_question.py @@ -31,7 +31,7 @@ from parse_questions import parseQuestionsFile -import cgi, os, demjson +import cgi, os form = cgi.FieldStorage() question_file = form['question_file'].value @@ -43,4 +43,4 @@ # Crucial first line to make sure that Apache serves this data # correctly - DON'T FORGET THE EXTRA NEWLINES!!!: print "Content-type: text/plain; charset=iso-8859-1\n\n" -print demjson.encode(parseQuestionsFile(fn)) +print json.dumps(parseQuestionsFile(fn)) diff --git a/cgi-bin/run_tests.py b/cgi-bin/run_tests.py index dc8f084d1..221bea85e 100644 --- a/cgi-bin/run_tests.py +++ b/cgi-bin/run_tests.py @@ -30,7 +30,6 @@ import os, sys, re, shutil, filecmp, optparse, difflib import pg_logger -import demjson # all tests are found in this directory: @@ -42,7 +41,7 @@ def execute(test_script): def my_finalizer(output_lst): outfile = open(test_script[:-3] + '.out', 'w') - output_json = demjson.encode(output_lst, compactly=False) + output_json = json.dumps(output_lst) print >> outfile, output_json pg_logger.exec_script_str(open(test_script).read(), my_finalizer, True) diff --git a/cgi-bin/web_run_test.py b/cgi-bin/web_run_test.py index 4d932f37a..abe4592a6 100755 --- a/cgi-bin/web_run_test.py +++ b/cgi-bin/web_run_test.py @@ -127,7 +127,7 @@ def really_finalize(): # Crucial first line to make sure that Apache serves this data # correctly - DON'T FORGET THE EXTRA NEWLINES!!!: print "Content-type: text/plain; charset=iso-8859-1\n\n" - output_json = demjson.encode(ret, compactly=True) + output_json = json.dumps(ret) print output_json From 83110c770f175956b152310408432b23392df15c Mon Sep 17 00:00:00 2001 From: Philip Guo Date: Mon, 16 Jul 2012 21:45:48 -0700 Subject: [PATCH 009/502] bah --- cgi-bin/load_question.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/cgi-bin/load_question.py b/cgi-bin/load_question.py index 38a42f827..14d6522f8 100755 --- a/cgi-bin/load_question.py +++ b/cgi-bin/load_question.py @@ -31,7 +31,7 @@ from parse_questions import parseQuestionsFile -import cgi, os +import cgi, os, json form = cgi.FieldStorage() question_file = form['question_file'].value From 1b7086736220832c998410d0fb20bc6845389a07 Mon Sep 17 00:00:00 2001 From: Philip Guo Date: Mon, 16 Jul 2012 21:49:46 -0700 Subject: [PATCH 010/502] updated comments --- question.html | 2 +- tutor.html | 1 - 2 files changed, 1 insertion(+), 2 deletions(-) diff --git a/question.html b/question.html index 59ac818b9..a60214513 100644 --- a/question.html +++ b/question.html @@ -211,7 +211,7 @@ repository and send bug reports, feedback, and suggestions to philip@pgbovine.net

-Copyright © 2010-2011 Philip Guo. All rights reserved. +Copyright © 2010-2012 Philip Guo. All rights reserved. diff --git a/tutor.html b/tutor.html index 2fe743869..6a39233d0 100644 --- a/tutor.html +++ b/tutor.html @@ -218,4 +218,3 @@ - From 76780996103149625d4ece3b4356c61f0f5136bf Mon Sep 17 00:00:00 2001 From: Philip Guo Date: Fri, 20 Jul 2012 21:59:18 -0700 Subject: [PATCH 011/502] added some porting notes --- Python3-porting.txt | 88 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 88 insertions(+) create mode 100644 Python3-porting.txt diff --git a/Python3-porting.txt b/Python3-porting.txt new file mode 100644 index 000000000..49f383a27 --- /dev/null +++ b/Python3-porting.txt @@ -0,0 +1,88 @@ +Notes from Peter Wentworth about porting to Python 3 +''' +Hi Philip - a bug in the code I sent you [NB, see: python3_viz.zip]! I +really kludged how I tested for classes vs instances in the file +p3_encoder that I sent you. At line 77 of that file, I used str(dat) +to convert the object to a string, and then did some hackish substring +searching. But if the user provides a __str__ method in the class, it +gets called instead, leading to trouble. + +My quick hack was to change the str(dat) call to repr(dat) (which won't +dispatch to user-written methods), but it doesn't solve the key issue +that I have not taken proper care to cleanly categorize +types/objects/classes in Python 3. + +Peter + +-----Original Message----- +From: George Wells +Sent: 21 September 2011 03:47 PM +To: Peter Wentworth +Subject: Python visualiser + +Hi Peter + +I just tried a simple example of a class in the visualiser and it is +generating an error for some reason (the code runs fine in the +interpreter). It was working fine until I added the second method +(__str__). + +The code is: + +-----8<----- +class Point: + def __init__ (self, x=0, y=0): + self.x=x + self.y=y + def __str__ (self): + return '({0}, {1})'.format(self.x, self.y) + +pt=Point(3,4) +print(pt) +-----8<----- + +Cheers, +George. +''' + +''' +Hi Philip + +And my last bug report was even sloppy. I use str(dat) at three +different places in that file, so it needs to be refactored a little +before changing the str() to repr() +''' + +Regarding how to port to Python 3 ... +''' +HI Philip + +I don't have anything to recommend. My experience is that there are +very few (end-user) things that are quite widely talked about in various +forums. Key ones for me is that print is now a function; range is +inherently lazy (like P2 xrange used to be), strings are no longer +ascii – they are all Unicode, input takes on the semantics of P2 +rawinput, and some methods to iterate over dictionaries are different. + +In the context of the visualizer, changing Python 2 to Python 3 wasn't +particularly complicated, except for the class/instance hurdle. P3 has +a more unified class-based type system, immediately evident if you ask +type(123) -- it now returns . Classes are themselves +instances of some MetaClass, with a thing called 'type' at the top of +the hierarchy. ('type' is an instance of 'type') So there isn't +really an easy end-user way to ask "is this a class or an instance?" – +it is both at the same time! There is some library that can expose +detailed internal attributes of things, but I chose not to use that. +Rather, if you ask for repr(obj) it turns it into some external string +that always has the word 'instance' in it for instances! So I got repr +to do the internal inspection and I made the decision with some string +matching. + +One of the more interesting new features in Python 3 is a function +annotation mechanism. The compiler ignores annotations. The idea +seems to be "lets allow annotations and see what creative things the +third-party tools do with them". See +http://www.python.org/dev/peps/pep-3107/ where they use annotations for +type signatures etc. +''' + From 252b10416a5725819fb3380644ca44e596bf4da2 Mon Sep 17 00:00:00 2001 From: Philip Guo Date: Fri, 20 Jul 2012 22:29:02 -0700 Subject: [PATCH 012/502] bam --- Python3-porting.txt | 3 + cgi-bin/p4_encoder.py | 192 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 195 insertions(+) create mode 100755 cgi-bin/p4_encoder.py diff --git a/Python3-porting.txt b/Python3-porting.txt index 49f383a27..f03f55535 100644 --- a/Python3-porting.txt +++ b/Python3-porting.txt @@ -1,3 +1,6 @@ +See cgi-bin/p4_encoder.py for some proposed changes + + Notes from Peter Wentworth about porting to Python 3 ''' Hi Philip - a bug in the code I sent you [NB, see: python3_viz.zip]! I diff --git a/cgi-bin/p4_encoder.py b/cgi-bin/p4_encoder.py new file mode 100755 index 000000000..4c28ac3de --- /dev/null +++ b/cgi-bin/p4_encoder.py @@ -0,0 +1,192 @@ +#!/usr/bin/python3 -u + +# Python 3 version of encoder by David Pritchard, built upon work by Peter Wentworth +# (diff with pg_encoder.py, which is for Python 2) + + +# given an arbitrary piece of Python data, encode it in such a manner +# that it can be later encoded into JSON. +# http://json.org/ +# +# Format: +# * None, int, float, str, bool - unchanged (long is removed in Python 3) +# (json.dumps encodes these fine verbatim) +# * list - ['LIST', unique_id, elt1, elt2, elt3, ..., eltN] +# * tuple - ['TUPLE', unique_id, elt1, elt2, elt3, ..., eltN] +# * set - ['SET', unique_id, elt1, elt2, elt3, ..., eltN] +# * dict - ['DICT', unique_id, [key1, value1], [key2, value2], ..., [keyN, valueN]] +# * instance - ['INSTANCE', class name, unique_id, [attr1, value1], [attr2, value2], ..., [attrN, valueN]] +# * class - ['CLASS', class name, unique_id, [list of superclass names], [attr1, value1], [attr2, value2], ..., [attrN, valueN]] +# * circular reference - ['CIRCULAR_REF', unique_id] +# * other - [, unique_id, string representation of object] +# +# +# the unique_id is derived from id(), which allows us to explicitly +# capture aliasing of compound values + +# Key: real ID from id() +# Value: a small integer for greater readability, set by cur_small_id +real_to_small_IDs = {} +cur_small_id = 1 + +import re, types +#typeRE = re.compile("") # not used in Python 3 +classRE = re.compile("") +functionRE = re.compile("") # new case for Python 3 + +# When we find a and x is in this list, don't confuse the beginner by listing the inner details +native_types = ['int', 'float', 'str', 'tuple', 'list', 'set', 'dict', 'bool', 'NoneType', 'bytes', 'type', 'object'] + +def encode(dat, ignore_id=False): + + def append_attributes(ret, new_compound_obj_ids, dict): + """ Put attributes onto ret. """ + # traverse the __dict__ to grab attributes + # (filter out useless-seeming ones): + + user_attrs = sorted([e for e in dict.keys() + if e not in {'__doc__', '__module__', '__return__', '__locals__', + '__weakref__', '__dict__'} + ]) + for attr in user_attrs: + foo = [encode_helper(attr, new_compound_obj_ids), + encode_helper(dict[attr], new_compound_obj_ids)] + ret.append(foo) + + def encode_helper(dat, compound_obj_ids): + # primitive type + if dat is None or type(dat) in (int, float, str, bool): + return dat + # compound type + else: + my_id = id(dat) + + global cur_small_id + if my_id not in real_to_small_IDs: + if ignore_id: + real_to_small_IDs[my_id] = 99999 + else: + real_to_small_IDs[my_id] = cur_small_id + cur_small_id += 1 + + if my_id in compound_obj_ids: + return ['CIRCULAR_REF', real_to_small_IDs[my_id]] + + new_compound_obj_ids = compound_obj_ids.union([my_id]) + + typ = type(dat) + obj_as_string = object.__repr__(dat) + + my_small_id = real_to_small_IDs[my_id] + + if typ == list: + ret = ['LIST', my_small_id] + for e in dat: ret.append(encode_helper(e, new_compound_obj_ids)) + elif typ == tuple: + ret = ['TUPLE', my_small_id] + for e in dat: ret.append(encode_helper(e, new_compound_obj_ids)) + elif typ == set: + ret = ['SET', my_small_id] + for e in dat: ret.append(encode_helper(e, new_compound_obj_ids)) + elif typ == dict: + ret = ['DICT', my_small_id] + append_attributes(ret, new_compound_obj_ids, dat) + + elif typ == type: # its a class. What a mess they made of it! + superclass_names = [e.__name__ for e in dat.__bases__] + ret = ['CLASS', dat.__name__, my_small_id, superclass_names] + if dat.__name__ not in native_types: + if hasattr(dat, '__dict__'): + append_attributes(ret, new_compound_obj_ids, dat.__dict__) + + elif repr(typ)[:6] == "= 0: # is it an instance? + ret = ['INSTANCE', dat.__class__.__name__, my_small_id] + if hasattr(dat, '__dict__'): + append_attributes(ret, new_compound_obj_ids, dat.__dict__) + + else: + typeStr = repr(typ) + m = classRE.match(typeStr) + assert m, typ + ret = [m.group(1), my_small_id , obj_as_string] + + return ret + + return encode_helper(dat, set()) + + +if __name__ == '__main__': + + def test(actual, expected=0): + """ Compare the actual to the expected value, and print a suitable message. """ + import sys + linenum = sys._getframe(1).f_lineno # get the caller's line number. + if (expected == actual): + msg = "Test on line %s passed." % (linenum) + else: + msg = "Test on line %s failed. Expected '%s', but got '%s'." % (linenum, expected, actual) + print(msg) + + class P(): + p_attr1 = 123 + def p_method(self, x): + return 2*x + + class Q(P): + pass + + p1 = P() + q1 = Q() + + addr = 1 + + test(encode("hello"),"hello") + test(encode(123),123) + test(encode(123.45),123.45) + test(encode(132432134423143132432134423143),132432134423143132432134423143) + test(encode(False),False) + test(encode(None),None) + + + test(encode((1,2)), ['TUPLE', addr, 1, 2]) + + addr += 1 + test(encode([1,2]), ['LIST', addr, 1, 2]) + + addr += 1 + test(encode({1:'mon'}), ['DICT', addr, [1, 'mon']]) + + addr += 1 + test(encode(test), ['function', addr, 'test']) + + addr += 1 + test(encode(P), ['CLASS', 'P', addr, ['object'], ['p_attr1', 123], ['p_method', ['function', addr+1, 'p_method']]]) + + addr += 2 + test(encode(Q), ['CLASS', 'Q', addr, ['P']]) + + addr += 1 + test(encode(p1), ['INSTANCE', 'P', addr]) + + addr += 1 + test(encode(q1), ['INSTANCE', 'Q', addr]) + + addr += 1 + test(encode(min), ['builtin_function_or_method', addr, ''] ) + + addr += 1 + test(encode(range(1,3)), ['range', addr, 'range(1, 3)']) + + addr += 1 + test(encode({1,2}), ['SET', addr, 1, 2]) + + addr += 1 + p = [1,2,3] + p.append(p) # make a circular reference + + test(encode(p), ['LIST', addr, 1, 2, 3, ['CIRCULAR_REF', addr]]) + +# Need some new tests for z = type(123) + + + print(encode({"stdout": "", "func_name": "", "globals": {"sum": 0, "friends": ["LIST", 1, "Joe", "Bill"], "length": 3, "f": "Joe"}, "stack_locals": [], "line": 7, "event": "step_line"})) From cd12aff59f1d399910775c0db148ec494f2eb106 Mon Sep 17 00:00:00 2001 From: Philip Guo Date: Mon, 23 Jul 2012 21:23:46 -0700 Subject: [PATCH 013/502] added john's comments --- Python3-porting.txt | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/Python3-porting.txt b/Python3-porting.txt index f03f55535..dca80e0fa 100644 --- a/Python3-porting.txt +++ b/Python3-porting.txt @@ -1,5 +1,15 @@ See cgi-bin/p4_encoder.py for some proposed changes +John DeNero's comments on 2012-07-23 +''' +Distinguishing whether +some x is a class or not in Python 3 should be performed via: + +isinstance(x, type) + +I don't think any sort of hack or repr comparison is required. +''' + Notes from Peter Wentworth about porting to Python 3 ''' From bdeda19540e3c318ddbbf070392628f382e12794 Mon Sep 17 00:00:00 2001 From: Philip Guo Date: Fri, 3 Aug 2012 22:29:16 -0700 Subject: [PATCH 014/502] checked in rudimentary "3.0" version of OPT, hosted on Google App Engine --- PyTutorGAE/app.yaml | 23 + PyTutorGAE/css/codemirror.css | 169 + PyTutorGAE/css/edu-python.css | 693 ++++ .../smoothness/jquery-ui-1.8.21.custom.css | 310 ++ .../ui-bg_diagonals-thick_18_b81900_40x40.png | Bin 0 -> 260 bytes .../ui-bg_diagonals-thick_20_666666_40x40.png | Bin 0 -> 251 bytes .../images/ui-bg_flat_10_000000_40x100.png | Bin 0 -> 178 bytes .../images/ui-bg_glass_100_f6f6f6_1x400.png | Bin 0 -> 104 bytes .../images/ui-bg_glass_100_fdf5ce_1x400.png | Bin 0 -> 125 bytes .../images/ui-bg_glass_65_ffffff_1x400.png | Bin 0 -> 105 bytes .../ui-bg_gloss-wave_35_f6a828_500x100.png | Bin 0 -> 3762 bytes .../ui-bg_highlight-soft_100_eeeeee_1x100.png | Bin 0 -> 90 bytes .../ui-bg_highlight-soft_75_ffe45c_1x100.png | Bin 0 -> 129 bytes .../images/ui-icons_222222_256x240.png | Bin 0 -> 4369 bytes .../images/ui-icons_228ef1_256x240.png | Bin 0 -> 4369 bytes .../images/ui-icons_ef8c08_256x240.png | Bin 0 -> 4369 bytes .../images/ui-icons_ffd27a_256x240.png | Bin 0 -> 4369 bytes .../images/ui-icons_ffffff_256x240.png | Bin 0 -> 4369 bytes .../ui-lightness/jquery-ui-1.8.21.custom.css | 310 ++ PyTutorGAE/example-code | 1 + PyTutorGAE/js/codemirror/codemirror.js | 3231 +++++++++++++++++ PyTutorGAE/js/codemirror/python.js | 338 ++ PyTutorGAE/js/d3.v2.min.js | 4 + PyTutorGAE/js/edu-python-tutor.js | 343 ++ PyTutorGAE/js/edu-python.js | 2534 +++++++++++++ PyTutorGAE/js/jquery-1.3.2.min.js | 19 + PyTutorGAE/js/jquery-ui-1.8.21.custom.min.js | 21 + PyTutorGAE/js/jquery.ba-bbq.min.js | 18 + .../js/jquery.jsPlumb-1.3.10-all-min.js | 1 + PyTutorGAE/pg_encoder.py | 174 + PyTutorGAE/pg_logger.py | 516 +++ PyTutorGAE/pythontutor.py | 67 + PyTutorGAE/tutor.html | 234 ++ example-code/aliasing.txt | 4 +- example-code/aliasing/aliasing1.txt | 2 + example-code/aliasing/aliasing2.txt | 2 + example-code/aliasing/aliasing3.txt | 7 + example-code/aliasing/aliasing4.txt | 2 + example-code/aliasing/aliasing5.txt | 3 + example-code/aliasing/aliasing6.txt | 7 + example-code/aliasing/aliasing7.txt | 5 + example-code/closures/closure1.txt | 7 + example-code/closures/closure2.txt | 15 + example-code/closures/closure3.txt | 10 + example-code/closures/closure4.txt | 8 + example-code/closures/closure5.txt | 10 + example-code/linked-lists/ll1.txt | 10 + example-code/linked-lists/ll2.txt | 15 + 48 files changed, 9111 insertions(+), 2 deletions(-) create mode 100644 PyTutorGAE/app.yaml create mode 100644 PyTutorGAE/css/codemirror.css create mode 100644 PyTutorGAE/css/edu-python.css create mode 100644 PyTutorGAE/css/smoothness/jquery-ui-1.8.21.custom.css create mode 100644 PyTutorGAE/css/ui-lightness/images/ui-bg_diagonals-thick_18_b81900_40x40.png create mode 100644 PyTutorGAE/css/ui-lightness/images/ui-bg_diagonals-thick_20_666666_40x40.png create mode 100644 PyTutorGAE/css/ui-lightness/images/ui-bg_flat_10_000000_40x100.png create mode 100644 PyTutorGAE/css/ui-lightness/images/ui-bg_glass_100_f6f6f6_1x400.png create mode 100644 PyTutorGAE/css/ui-lightness/images/ui-bg_glass_100_fdf5ce_1x400.png create mode 100644 PyTutorGAE/css/ui-lightness/images/ui-bg_glass_65_ffffff_1x400.png create mode 100644 PyTutorGAE/css/ui-lightness/images/ui-bg_gloss-wave_35_f6a828_500x100.png create mode 100644 PyTutorGAE/css/ui-lightness/images/ui-bg_highlight-soft_100_eeeeee_1x100.png create mode 100644 PyTutorGAE/css/ui-lightness/images/ui-bg_highlight-soft_75_ffe45c_1x100.png create mode 100644 PyTutorGAE/css/ui-lightness/images/ui-icons_222222_256x240.png create mode 100644 PyTutorGAE/css/ui-lightness/images/ui-icons_228ef1_256x240.png create mode 100644 PyTutorGAE/css/ui-lightness/images/ui-icons_ef8c08_256x240.png create mode 100644 PyTutorGAE/css/ui-lightness/images/ui-icons_ffd27a_256x240.png create mode 100644 PyTutorGAE/css/ui-lightness/images/ui-icons_ffffff_256x240.png create mode 100644 PyTutorGAE/css/ui-lightness/jquery-ui-1.8.21.custom.css create mode 120000 PyTutorGAE/example-code create mode 100644 PyTutorGAE/js/codemirror/codemirror.js create mode 100644 PyTutorGAE/js/codemirror/python.js create mode 100644 PyTutorGAE/js/d3.v2.min.js create mode 100644 PyTutorGAE/js/edu-python-tutor.js create mode 100644 PyTutorGAE/js/edu-python.js create mode 100644 PyTutorGAE/js/jquery-1.3.2.min.js create mode 100644 PyTutorGAE/js/jquery-ui-1.8.21.custom.min.js create mode 100644 PyTutorGAE/js/jquery.ba-bbq.min.js create mode 100644 PyTutorGAE/js/jquery.jsPlumb-1.3.10-all-min.js create mode 100644 PyTutorGAE/pg_encoder.py create mode 100644 PyTutorGAE/pg_logger.py create mode 100644 PyTutorGAE/pythontutor.py create mode 100644 PyTutorGAE/tutor.html create mode 100644 example-code/aliasing/aliasing1.txt create mode 100644 example-code/aliasing/aliasing2.txt create mode 100644 example-code/aliasing/aliasing3.txt create mode 100644 example-code/aliasing/aliasing4.txt create mode 100644 example-code/aliasing/aliasing5.txt create mode 100644 example-code/aliasing/aliasing6.txt create mode 100644 example-code/aliasing/aliasing7.txt create mode 100644 example-code/closures/closure1.txt create mode 100644 example-code/closures/closure2.txt create mode 100644 example-code/closures/closure3.txt create mode 100644 example-code/closures/closure4.txt create mode 100644 example-code/closures/closure5.txt create mode 100644 example-code/linked-lists/ll1.txt create mode 100644 example-code/linked-lists/ll2.txt diff --git a/PyTutorGAE/app.yaml b/PyTutorGAE/app.yaml new file mode 100644 index 000000000..82d6eeb57 --- /dev/null +++ b/PyTutorGAE/app.yaml @@ -0,0 +1,23 @@ +application: google.com:pythontutor +version: 1 +runtime: python27 +api_version: 1 +threadsafe: false + +libraries: +- name: jinja2 + version: latest + +handlers: +- url: /js + static_dir: js + +- url: /css + static_dir: css + +- url: /example-code + static_dir: example-code + +- url: /.* + script: pythontutor.app + diff --git a/PyTutorGAE/css/codemirror.css b/PyTutorGAE/css/codemirror.css new file mode 100644 index 000000000..fb5b6d544 --- /dev/null +++ b/PyTutorGAE/css/codemirror.css @@ -0,0 +1,169 @@ +.CodeMirror { + line-height: 1em; + font-family: monospace; + + /* Necessary so the scrollbar can be absolutely positioned within the wrapper on Lion. */ + position: relative; + /* This prevents unwanted scrollbars from showing up on the body and wrapper in IE. */ + overflow: hidden; +} + +.CodeMirror-scroll { + overflow-x: auto; + overflow-y: hidden; + height: 300px; + /* This is needed to prevent an IE[67] bug where the scrolled content + is visible outside of the scrolling box. */ + position: relative; + outline: none; +} + +/* Vertical scrollbar */ +.CodeMirror-scrollbar { + float: right; + overflow-x: hidden; + overflow-y: scroll; + + /* This corrects for the 1px gap introduced to the left of the scrollbar + by the rule for .CodeMirror-scrollbar-inner. */ + margin-left: -1px; +} +.CodeMirror-scrollbar-inner { + /* This needs to have a nonzero width in order for the scrollbar to appear + in Firefox and IE9. */ + width: 1px; +} +.CodeMirror-scrollbar.cm-sb-overlap { + /* Ensure that the scrollbar appears in Lion, and that it overlaps the content + rather than sitting to the right of it. */ + position: absolute; + z-index: 1; + float: none; + right: 0; + min-width: 12px; +} +.CodeMirror-scrollbar.cm-sb-nonoverlap { + min-width: 12px; +} +.CodeMirror-scrollbar.cm-sb-ie7 { + min-width: 18px; +} + +.CodeMirror-gutter { + position: absolute; left: 0; top: 0; + z-index: 10; + background-color: #f7f7f7; + border-right: 1px solid #eee; + min-width: 2em; + height: 100%; +} +.CodeMirror-gutter-text { + color: #aaa; + text-align: right; + padding: .4em .2em .4em .4em; + white-space: pre !important; + cursor: default; +} +.CodeMirror-lines { + padding: .4em; + white-space: pre; + cursor: text; +} +.CodeMirror-lines * { + /* Necessary for throw-scrolling to decelerate properly on Safari. */ + pointer-events: none; +} + +.CodeMirror pre { + -moz-border-radius: 0; + -webkit-border-radius: 0; + -o-border-radius: 0; + border-radius: 0; + border-width: 0; margin: 0; padding: 0; background: transparent; + font-family: inherit; + font-size: inherit; + padding: 0; margin: 0; + white-space: pre; + word-wrap: normal; + line-height: inherit; + color: inherit; +} + +.CodeMirror-wrap pre { + word-wrap: break-word; + white-space: pre-wrap; + word-break: normal; +} +.CodeMirror-wrap .CodeMirror-scroll 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background: rgba(255, 255, 0, .4); +} + +/* Default theme */ + +.cm-s-default span.cm-keyword {color: #708;} +.cm-s-default span.cm-atom {color: #219;} +.cm-s-default span.cm-number {color: #164;} +.cm-s-default span.cm-def {color: #00f;} +.cm-s-default span.cm-variable {color: black;} +.cm-s-default span.cm-variable-2 {color: #05a;} +.cm-s-default span.cm-variable-3 {color: #085;} +.cm-s-default span.cm-property {color: black;} +.cm-s-default span.cm-operator {color: black;} +.cm-s-default span.cm-comment {color: #a50;} +.cm-s-default span.cm-string {color: #a11;} +.cm-s-default span.cm-string-2 {color: #f50;} +.cm-s-default span.cm-meta {color: #555;} +.cm-s-default span.cm-error {color: #f00;} +.cm-s-default span.cm-qualifier {color: #555;} +.cm-s-default span.cm-builtin {color: #30a;} +.cm-s-default span.cm-bracket {color: #cc7;} +.cm-s-default span.cm-tag {color: #170;} +.cm-s-default span.cm-attribute {color: #00c;} +.cm-s-default span.cm-header {color: blue;} +.cm-s-default span.cm-quote {color: #090;} +.cm-s-default span.cm-hr {color: #999;} +.cm-s-default span.cm-link {color: #00c;} + +span.cm-header, span.cm-strong {font-weight: bold;} +span.cm-em {font-style: italic;} +span.cm-emstrong {font-style: italic; font-weight: bold;} +span.cm-link {text-decoration: underline;} + +div.CodeMirror span.CodeMirror-matchingbracket {color: #0f0;} +div.CodeMirror span.CodeMirror-nonmatchingbracket {color: #f22;} diff --git a/PyTutorGAE/css/edu-python.css b/PyTutorGAE/css/edu-python.css new file mode 100644 index 000000000..7cb665972 --- /dev/null +++ b/PyTutorGAE/css/edu-python.css @@ -0,0 +1,693 @@ +/* + +Online Python Tutor +https://github.com/pgbovine/OnlinePythonTutor/ + +Copyright (C) 2010-2012 Philip J. Guo (philip@pgbovine.net) + +Permission is hereby granted, free of charge, to any person obtaining a +copy of this software and associated documentation files (the +"Software"), to deal in the Software without restriction, including +without limitation the rights to use, copy, modify, merge, publish, +distribute, sublicense, and/or sell copies of the Software, and to +permit persons to whom the Software is furnished to do so, subject to +the following conditions: + +The above copyright notice and this permission notice shall be included +in all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. +IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY +CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, +TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE +SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + +*/ + + +/* +Color scheme ideas: + +Current scheme: pastel blue and yellow with a hint of red: + http://colorschemedesigner.com/#3N32mmmuew0w0 + +Primary Color: + 3D58A2 41507A 142B69 6F89D1 899CD1 +Secondary Color A: + EBF048 B1B456 989C17 F4F776 F5F798 +Secondary Color B: + F15149 B55B56 9D1E18 F87D76 F89D99 + + +Alternates: + +pastel green, yellow, and purple: + http://colorschemedesigner.com/#2P32PbX--w0w0 + + Primary Color: + A0FFA0 8ABF8A 34A634 B8FFB8 CBFFCB + Secondary Color A: + FFEFA0 BFB68A A69234 FFF3B8 FFF6CB + Secondary Color B: + BFABFF 9B90BF 5237A6 CFC0FF DCD1FF + + +pastel blue and yellow: + http://colorschemedesigner.com/#0W21TjruJw0w0 + +Primary Color: + F5C260 B89B64 9F741F FAD388 FADEA6 +Complementary Color: + 4A67A4 49597B 18326A 7C97D1 93A7D1 + + +*/ + +h1 { + font-weight: normal; + font-size: 20pt; + font-family: georgia, serif; + line-height: 1em; /* enforce single spacing so that Georgia works */ + + margin-top: 0px; + margin-bottom: 8px; +} + +h2 { + font-size: 12pt; + font-weight: normal; + font-family: georgia, serif; + line-height: 1.1em; /* enforce single spacing so that Georgia works */ + + margin-top: 2px; + margin-bottom: 20px; +} + + +body { + background-color: white; + font-family: verdana, arial, helvetica, sans-serif; + font-size: 10pt; +} + +a { + color: #3D58A2; +} + +a:visited { + color: #3D58A2; +} + +a:hover { + color: #3D58A2; +} + +span { + padding: 0px; +} + +#pyInputPane { + margin-top: 20px; + margin-bottom: 20px; + + max-width: 700px; + /* center align */ + margin-left: auto; + margin-right: auto; +} + +#codeInputPane { + margin-top: 5px; + font-size: 12pt; +} + +td#stack_td, +td#heap_td { + vertical-align:top; + font-size: 12pt; +} + +table#pyOutputPane { + padding: 15px; +} + +#dataViz { + margin-left: 30px; +} + +table.frameDataViz { + border-spacing: 0px; + font-size: 12pt; + margin-top: 5px; + margin-left: 15px; + background-color: #dddddd; + padding: 5px; +} + +table.frameDataViz td.varname { + text-align: right; + padding: 5px; + padding-right: 8px; + border-right: 1px dashed #888888; +} + +table.frameDataViz td.val { + padding-left: 8px; + padding-right: 5px; + + padding-top: 8px; + padding-bottom: 8px; +} + +div#pyCodeOutputDiv { + max-width: 550px; + max-height: 620px; + overflow: auto; + /*margin-bottom: 4px;*/ +} + +table#pyCodeOutput { + font-family: Andale mono, monospace; + font-size:12pt; + line-height:1.1em; + border-spacing: 0px; + border-top: 1px solid #999999; + padding-top: 3px; + border-bottom: 1px solid #999999; + margin-top: 6px; +} + +/* don't wrap lines within code output ... FORCE scrollbars to appear */ +table#pyCodeOutput td { + white-space: nowrap; +} + +table#pyCodeOutput .lineNo { + background-color:#FFFFFF; + color:#AAAAAA; + margin:0; + padding:0.2em; + padding-right:0.5em; + text-align:right; + width:2.1em; +} + +table#pyCodeOutput .cod { + /*font-weight: bold;*/ + margin-left: 3px; + padding-left: 7px; + text-align: left; /* necessary or else doesn't work properly in IE */ +} + +div#editCodeLinkDiv { + text-align: center; + margin-top: 12px; + margin-bottom: 4px; +} + +#editCodeLinkOnError { + color: #142B69; +} + + +#errorOutput { + background-color: #F87D76; + font-size: 12pt; + padding: 2px; + line-height: 1.5em; + margin-bottom: 4px; +} + +button.bigBtn { + font-size: 12pt; + padding: 5px; +} + +button.medBtn { + font-size: 12pt; + padding: 3px; +} + +button.smallBtn { + font-size: 10pt; + padding: 3px; +} + + + +/* VCR control buttons for stepping through execution */ + +#vcrControls { + margin-top: 10px; + margin-bottom: 15px; +} + +#vcrControls button { + margin-left: 5px; + margin-right: 5px; +} + +#pyStdout { + border: 1px solid #999999; + font-size: 12pt; + padding: 4px; + font-family: Andale mono, monospace; +} + + +.vizFrame { + margin-bottom: 20px; + padding-left: 8px; + border-left: 2px solid #cccccc; +} + + +/* Python data value rendering */ + +.nullObj { + color: #555555; + font-size: 9pt; +} + +.numberObj { + font-size: 10pt; +} + +.boolObj { + font-size: 10pt; +} + +.stringObj { + /* don't add a color since strings need to be rendered against various backgrounds */ + font-family: Andale mono, monospace; + font-size: 10pt; +} + +.keyObj { + font-size: 10pt; +} + +.customObj { + font-family: Andale mono, monospace; + /*font-style: italic;*/ + font-size: 10pt; +} + +.funcObj { + font-family: Andale mono, monospace; + /*font-style: italic;*/ + font-size: 10pt; +} + +.retval, +.returnWarning { + font-size: 9pt; +} + +.returnWarning { + padding-top: 10px; + color: #9d1e18; +} + + +table.listTbl { + border: 0px solid black; + background-color: #F5F798; + border-spacing: 0px; +} + + +table.listTbl td.listHeader, +table.tupleTbl td.tupleHeader { + padding-left: 5px; + padding-top: 3px; + font-size: 8pt; + color: #666666; + text-align: left; + border-left: 1px solid #555555; +} + +table.tupleTbl { + background-color: #F5F798; + border-spacing: 0px; + color: black; + + border-bottom: 1px solid #555555; /* must match td.tupleHeader border */ + border-top: 1px solid #555555; /* must match td.tupleHeader border */ + border-right: 1px solid #555555; /* must match td.tupleHeader border */ +} + + +table.listTbl td.listElt { + border-bottom: 1px solid #555555; /* must match td.listHeader border */ + border-left: 1px solid #555555; /* must match td.listHeader border */ +} + +table.tupleTbl td.tupleElt { + border-left: 1px solid #555555; /* must match td.tupleHeader border */ +} + +table.listTbl td.listElt, +table.tupleTbl td.tupleElt { + padding-top: 0px; + padding-bottom: 8px; + padding-left: 10px; + padding-right: 10px; + vertical-align: bottom; +} + +table.setTbl { + border: 1px solid #555555; + background-color: #F5F798; + border-spacing: 0px; + text-align: center; +} + +table.setTbl td.setElt { + padding: 8px; +} + + +table.dictTbl { + border: 1px solid #555555; + border-collapse: collapse; + border-spacing: 1px; +} + +table.dictTbl tr.dictEntry { + border: 1px #111111 solid; +} + +table.dictTbl td.dictKey, +table.instTbl td.instKey { + background-color: #ffffff; +} + +table.dictTbl, +table.dictTbl td.dictVal, +table.instTbl, +table.instTbl td.instVal { + background-color: #F5F798; +} + + +table.dictTbl td.dictKey, +table.classTbl td.classKey, +table.instTbl td.instKey { + padding-top: 8px; + padding-bottom: 8px; + padding-left: 8px; + padding-right: 8px; + + text-align: right; + vertical-align: center; +} + +table.classTbl td.classKey { + color: #dddddd; +} + +table.classTbl { + background-color: #dddddd; + border-collapse: collapse; + border-spacing: 1px; +} + +table.classTbl tr.classEntry { + border: 1px #777777 solid; +} + +table.classTbl td.classKey { + background-color: #222222; +} + +table.classTbl td.classVal { + background-color: #ffffff; +} + + +table.instTbl { + border-collapse: collapse; + border-spacing: 1px; +} + +table.instTbl tr.instEntry { + border: 1px #555555 solid; +} + + +table.dictTbl td.dictVal, +table.classTbl td.classVal, +table.instTbl td.instVal { + padding-top: 10px; + padding-bottom: 10px; + padding-right: 10px; + padding-left: 8px; + vertical-align: center; +} + + + + +.typeLabel { + font-size: 8pt; + color: #222222; + margin-bottom: 1px; +} + +td.dictKey .typeLabel { + color: #eeeeee; +} + +.aliasLabel { + font-size: 10pt; + color: #222222; +} + +#footer { + color: #666666; + font-size: 9pt; + border-top: 1px solid #bbbbbb; + padding-top: 5px; + margin-top: 5px; + + max-width: 700px; + /* center align */ + margin-left: auto; + margin-right: auto; +} + + +/* new stuff added for Online Python Tutor "2.0" release */ + +div#stack { + float: left; + padding-left: 10px; + padding-right: 30px; + border-right: 1px dashed #bbbbbb; +} + +div.stackFrame, div.zombieStackFrame { + background-color: #ffffff; + margin-bottom: 15px; + padding: 2px; + padding-left: 6px; + padding-right: 6px; + padding-bottom: 4px; + font-size: 11pt; + border-left: 2px solid #666666; +} + +div.zombieStackFrame { + border-left: 1px dotted #aaaaaa; /* make zombie borders thinner */ + color: #aaaaaa; +} + +div.highlightedStackFrame { + background-color: #dddddd; + border-left: 2px solid #F15149; +} + +div.stackFrameHeader { + font-family: Andale mono, monospace; + font-size: 10pt; + margin-top: 4px; + margin-bottom: 3px; +} + +td.stackFrameVar { + text-align: right; + padding-right: 8px; + padding-top: 3px; + padding-bottom: 3px; +} + +td.stackFrameValue { + text-align: left; + border-bottom: 1px solid #aaaaaa; + border-left: 1px solid #aaaaaa; + + padding-top: 3px; + padding-left: 3px; + padding-bottom: 3px; +} + +.stackFrameVarTable tr { + +} + +.stackFrameVarTable { + text-align: right; + padding-top: 3px; + + /* right-align the table */ + margin-left: auto; + margin-right: 0px; +} + +div#heap { + float: left; + padding-left: 30px; +} + +td.toplevelHeapObject { + padding-left: 0px; + padding-right: 20px; +} + +table.heapRow { + margin-bottom: 10px; +} + +div.heapObject { + padding-left: 2px; /* leave a TINY amount of room for connector endpoints */ +} + +div#stackHeader { + margin-bottom: 15px; + text-align: right; +} + +div#heapHeader { + /*margin-top: 2px; + margin-bottom: 13px;*/ + margin-bottom: 15px; +} + +div#stackHeader, +div#heapHeader { + color: #333333; + font-size: 10pt; +} + + +/* styles for Online Python Tutor questions site */ + +#questionsHeaderPane { + text-align: left; + margin-bottom: 15px; + width: 650px; + border-bottom: 1px solid #bbbbbb; +} + +.questionsHeaderStmt { + margin-bottom: 5px; +} + +.questionsHeaderTitle { + margin-bottom: 5px; + font-weight: bold; + font-size: 12pt; +} + +#submittedCodeRO { + font-size: 10pt; + font-family: Andale mono, monospace; + padding: 4px; + margin-top: 5px; +} + +table#gradeMatrix { + margin-top: 12px; +} + +table#gradeMatrix thead { + font-weight: bold; + border: solid; +} + +table#gradeMatrix thead td.statusCell { + padding-left: 18px; /* to line up with smiley faces */ +} + +table#gradeMatrix td.testInputCell, +table#gradeMatrix td.testOutputCell { + padding-right: 25px; + padding-bottom: 10px; + vertical-align: middle; +} + +table#gradeMatrix tbody td.statusCell, +table#gradeMatrix tbody td.expectedCell { + padding-left: 12px; + padding-bottom: 10px; + vertical-align: middle; +} + +td.testInputVarnameCell, +td.testOutputVarnameCell { + padding-right: 2px; + text-align: right; +} + +td.testInputValCell, +td.testOutputValCell { + padding-right: 5px; +} + +pre#submittedCodePRE { + font-size: 10pt; + font-family: Andale mono, monospace; + background-color: #dddddd; + padding: 5px; +} + +div#submittedSolutionDisplay { + width: 650px; /* to line up with questionsHeaderPane */ + text-align: left; + font-size: 12pt; + margin-bottom: 20px; +} + +#gradeSummary { + margin-top: 12px; +} + +#pyGradingPane { + margin-bottom: 20px; +} + + +#executionSlider { + /*width: 900px;*/ + width: 500px; + margin-top: 10px; + margin-bottom: 5px; +} + +#executionSliderCaption { + font-size: 8pt; + color: #666666; + margin-top: 15px; +} + +#executionSliderFooter { + margin-top: -7px; /* make it butt up against #executionSlider */ +} + +#sliderOverlay { + fill: #F15149; +} + diff --git a/PyTutorGAE/css/smoothness/jquery-ui-1.8.21.custom.css b/PyTutorGAE/css/smoothness/jquery-ui-1.8.21.custom.css new file mode 100644 index 000000000..737a94d4f --- /dev/null +++ b/PyTutorGAE/css/smoothness/jquery-ui-1.8.21.custom.css @@ -0,0 +1,310 @@ +/*! + * jQuery UI CSS Framework 1.8.21 + * + * Copyright 2012, AUTHORS.txt (http://jqueryui.com/about) + * Dual licensed under the MIT or GPL Version 2 licenses. + * http://jquery.org/license + * + * http://docs.jquery.com/UI/Theming/API + */ + +/* Layout helpers +----------------------------------*/ +.ui-helper-hidden { display: none; } +.ui-helper-hidden-accessible { position: absolute !important; clip: rect(1px 1px 1px 1px); clip: rect(1px,1px,1px,1px); } +.ui-helper-reset { margin: 0; padding: 0; border: 0; outline: 0; line-height: 1.3; text-decoration: none; font-size: 100%; list-style: none; } +.ui-helper-clearfix:before, .ui-helper-clearfix:after { content: ""; display: table; } +.ui-helper-clearfix:after { clear: both; } +.ui-helper-clearfix { zoom: 1; } +.ui-helper-zfix { width: 100%; height: 100%; top: 0; left: 0; position: absolute; opacity: 0; filter:Alpha(Opacity=0); } + + +/* Interaction Cues +----------------------------------*/ +.ui-state-disabled { cursor: default !important; } + + +/* Icons +----------------------------------*/ + +/* states and images */ +.ui-icon { display: block; text-indent: -99999px; overflow: hidden; background-repeat: no-repeat; } + + +/* Misc visuals +----------------------------------*/ + +/* Overlays */ +.ui-widget-overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; } + + +/*! + * jQuery UI CSS Framework 1.8.21 + * + * Copyright 2012, AUTHORS.txt (http://jqueryui.com/about) + * Dual licensed under the MIT or GPL Version 2 licenses. + * http://jquery.org/license + * + * http://docs.jquery.com/UI/Theming/API + * + * To view and modify this theme, visit http://jqueryui.com/themeroller/?ffDefault=Verdana,Arial,sans-serif&fwDefault=normal&fsDefault=1.1em&cornerRadius=4px&bgColorHeader=cccccc&bgTextureHeader=03_highlight_soft.png&bgImgOpacityHeader=75&borderColorHeader=aaaaaa&fcHeader=222222&iconColorHeader=222222&bgColorContent=ffffff&bgTextureContent=01_flat.png&bgImgOpacityContent=75&borderColorContent=aaaaaa&fcContent=222222&iconColorContent=222222&bgColorDefault=e6e6e6&bgTextureDefault=02_glass.png&bgImgOpacityDefault=75&borderColorDefault=d3d3d3&fcDefault=555555&iconColorDefault=888888&bgColorHover=dadada&bgTextureHover=02_glass.png&bgImgOpacityHover=75&borderColorHover=999999&fcHover=212121&iconColorHover=454545&bgColorActive=ffffff&bgTextureActive=02_glass.png&bgImgOpacityActive=65&borderColorActive=aaaaaa&fcActive=212121&iconColorActive=454545&bgColorHighlight=fbf9ee&bgTextureHighlight=02_glass.png&bgImgOpacityHighlight=55&borderColorHighlight=fcefa1&fcHighlight=363636&iconColorHighlight=2e83ff&bgColorError=fef1ec&bgTextureError=02_glass.png&bgImgOpacityError=95&borderColorError=cd0a0a&fcError=cd0a0a&iconColorError=cd0a0a&bgColorOverlay=aaaaaa&bgTextureOverlay=01_flat.png&bgImgOpacityOverlay=0&opacityOverlay=30&bgColorShadow=aaaaaa&bgTextureShadow=01_flat.png&bgImgOpacityShadow=0&opacityShadow=30&thicknessShadow=8px&offsetTopShadow=-8px&offsetLeftShadow=-8px&cornerRadiusShadow=8px + */ + + +/* Component containers +----------------------------------*/ +.ui-widget { font-family: Verdana,Arial,sans-serif; font-size: 1.1em; } +.ui-widget .ui-widget { font-size: 1em; } +.ui-widget input, .ui-widget select, .ui-widget textarea, .ui-widget button { font-family: Verdana,Arial,sans-serif; font-size: 1em; } +.ui-widget-content { border: 1px solid #aaaaaa; background: #ffffff url(images/ui-bg_flat_75_ffffff_40x100.png) 50% 50% repeat-x; color: #222222; } +.ui-widget-content a { color: #222222; } +.ui-widget-header { border: 1px solid #aaaaaa; background: #cccccc url(images/ui-bg_highlight-soft_75_cccccc_1x100.png) 50% 50% repeat-x; color: #222222; font-weight: bold; } +.ui-widget-header a { color: #222222; } + +/* Interaction states +----------------------------------*/ +.ui-state-default, .ui-widget-content .ui-state-default, .ui-widget-header .ui-state-default { border: 1px solid #d3d3d3; background: #e6e6e6 url(images/ui-bg_glass_75_e6e6e6_1x400.png) 50% 50% repeat-x; font-weight: normal; color: #555555; } +.ui-state-default a, .ui-state-default a:link, .ui-state-default a:visited { color: #555555; text-decoration: none; } +.ui-state-hover, .ui-widget-content .ui-state-hover, .ui-widget-header .ui-state-hover, .ui-state-focus, .ui-widget-content .ui-state-focus, .ui-widget-header .ui-state-focus { border: 1px solid #999999; background: #dadada url(images/ui-bg_glass_75_dadada_1x400.png) 50% 50% repeat-x; font-weight: normal; color: #212121; } +.ui-state-hover a, .ui-state-hover a:hover { color: #212121; text-decoration: none; } +.ui-state-active, .ui-widget-content .ui-state-active, .ui-widget-header .ui-state-active { border: 1px solid #aaaaaa; background: #ffffff url(images/ui-bg_glass_65_ffffff_1x400.png) 50% 50% repeat-x; font-weight: normal; color: #212121; } +.ui-state-active a, .ui-state-active a:link, .ui-state-active a:visited { color: #212121; text-decoration: none; } +.ui-widget :active { outline: none; } + +/* Interaction Cues +----------------------------------*/ +.ui-state-highlight, .ui-widget-content .ui-state-highlight, .ui-widget-header .ui-state-highlight {border: 1px solid #fcefa1; background: #fbf9ee url(images/ui-bg_glass_55_fbf9ee_1x400.png) 50% 50% repeat-x; color: #363636; } +.ui-state-highlight a, .ui-widget-content .ui-state-highlight a,.ui-widget-header .ui-state-highlight a { color: #363636; } +.ui-state-error, .ui-widget-content .ui-state-error, .ui-widget-header .ui-state-error {border: 1px solid #cd0a0a; background: #fef1ec url(images/ui-bg_glass_95_fef1ec_1x400.png) 50% 50% repeat-x; color: #cd0a0a; } +.ui-state-error a, .ui-widget-content .ui-state-error a, .ui-widget-header .ui-state-error a { color: #cd0a0a; } +.ui-state-error-text, .ui-widget-content .ui-state-error-text, .ui-widget-header .ui-state-error-text { color: #cd0a0a; } +.ui-priority-primary, .ui-widget-content .ui-priority-primary, .ui-widget-header .ui-priority-primary { font-weight: bold; } +.ui-priority-secondary, .ui-widget-content .ui-priority-secondary, .ui-widget-header .ui-priority-secondary { opacity: .7; filter:Alpha(Opacity=70); font-weight: normal; } +.ui-state-disabled, .ui-widget-content .ui-state-disabled, .ui-widget-header .ui-state-disabled { opacity: .35; filter:Alpha(Opacity=35); background-image: none; } + +/* Icons +----------------------------------*/ + +/* states and images */ +.ui-icon { width: 16px; height: 16px; background-image: url(images/ui-icons_222222_256x240.png); } +.ui-widget-content .ui-icon {background-image: url(images/ui-icons_222222_256x240.png); } +.ui-widget-header .ui-icon {background-image: url(images/ui-icons_222222_256x240.png); } +.ui-state-default .ui-icon { background-image: url(images/ui-icons_888888_256x240.png); } +.ui-state-hover .ui-icon, .ui-state-focus .ui-icon {background-image: url(images/ui-icons_454545_256x240.png); } +.ui-state-active .ui-icon {background-image: url(images/ui-icons_454545_256x240.png); } +.ui-state-highlight .ui-icon {background-image: url(images/ui-icons_2e83ff_256x240.png); } +.ui-state-error .ui-icon, .ui-state-error-text .ui-icon {background-image: url(images/ui-icons_cd0a0a_256x240.png); } + +/* positioning */ +.ui-icon-carat-1-n { background-position: 0 0; } +.ui-icon-carat-1-ne { background-position: -16px 0; } +.ui-icon-carat-1-e { background-position: -32px 0; } +.ui-icon-carat-1-se { background-position: -48px 0; } +.ui-icon-carat-1-s { background-position: -64px 0; } +.ui-icon-carat-1-sw { background-position: -80px 0; } +.ui-icon-carat-1-w { background-position: -96px 0; } +.ui-icon-carat-1-nw { background-position: -112px 0; } +.ui-icon-carat-2-n-s { background-position: -128px 0; } +.ui-icon-carat-2-e-w { background-position: -144px 0; } +.ui-icon-triangle-1-n { background-position: 0 -16px; } +.ui-icon-triangle-1-ne { background-position: -16px -16px; } +.ui-icon-triangle-1-e { background-position: -32px -16px; } +.ui-icon-triangle-1-se { background-position: -48px -16px; } +.ui-icon-triangle-1-s { background-position: -64px -16px; } +.ui-icon-triangle-1-sw { background-position: -80px -16px; } +.ui-icon-triangle-1-w { background-position: -96px -16px; } +.ui-icon-triangle-1-nw { background-position: -112px -16px; } +.ui-icon-triangle-2-n-s { background-position: -128px -16px; } +.ui-icon-triangle-2-e-w { background-position: -144px -16px; } +.ui-icon-arrow-1-n { background-position: 0 -32px; } +.ui-icon-arrow-1-ne { background-position: -16px -32px; } +.ui-icon-arrow-1-e { background-position: -32px -32px; } +.ui-icon-arrow-1-se { background-position: -48px -32px; } +.ui-icon-arrow-1-s { background-position: -64px -32px; } +.ui-icon-arrow-1-sw { background-position: -80px -32px; } +.ui-icon-arrow-1-w { background-position: -96px -32px; } +.ui-icon-arrow-1-nw { background-position: -112px -32px; } +.ui-icon-arrow-2-n-s { background-position: -128px -32px; } +.ui-icon-arrow-2-ne-sw { background-position: -144px -32px; } +.ui-icon-arrow-2-e-w { background-position: -160px -32px; } +.ui-icon-arrow-2-se-nw { background-position: -176px -32px; } +.ui-icon-arrowstop-1-n { background-position: -192px -32px; } +.ui-icon-arrowstop-1-e { background-position: -208px -32px; } +.ui-icon-arrowstop-1-s { background-position: -224px -32px; } +.ui-icon-arrowstop-1-w { background-position: -240px -32px; } +.ui-icon-arrowthick-1-n { background-position: 0 -48px; } +.ui-icon-arrowthick-1-ne { background-position: -16px -48px; } +.ui-icon-arrowthick-1-e { background-position: -32px -48px; } +.ui-icon-arrowthick-1-se { background-position: -48px -48px; } +.ui-icon-arrowthick-1-s { background-position: -64px -48px; } +.ui-icon-arrowthick-1-sw { background-position: -80px -48px; } +.ui-icon-arrowthick-1-w { background-position: -96px -48px; } +.ui-icon-arrowthick-1-nw { background-position: -112px -48px; } +.ui-icon-arrowthick-2-n-s { background-position: -128px -48px; } +.ui-icon-arrowthick-2-ne-sw { background-position: -144px -48px; } +.ui-icon-arrowthick-2-e-w { background-position: -160px -48px; } +.ui-icon-arrowthick-2-se-nw { background-position: -176px -48px; } +.ui-icon-arrowthickstop-1-n { background-position: -192px -48px; } +.ui-icon-arrowthickstop-1-e { background-position: -208px -48px; } +.ui-icon-arrowthickstop-1-s { background-position: -224px -48px; } +.ui-icon-arrowthickstop-1-w { background-position: -240px -48px; } +.ui-icon-arrowreturnthick-1-w { background-position: 0 -64px; } +.ui-icon-arrowreturnthick-1-n { background-position: -16px -64px; } +.ui-icon-arrowreturnthick-1-e { background-position: -32px -64px; } +.ui-icon-arrowreturnthick-1-s { background-position: -48px -64px; } +.ui-icon-arrowreturn-1-w { background-position: -64px -64px; } +.ui-icon-arrowreturn-1-n { background-position: -80px -64px; } +.ui-icon-arrowreturn-1-e { background-position: -96px -64px; } +.ui-icon-arrowreturn-1-s { background-position: -112px -64px; } +.ui-icon-arrowrefresh-1-w { background-position: -128px -64px; } +.ui-icon-arrowrefresh-1-n { background-position: -144px -64px; } +.ui-icon-arrowrefresh-1-e { background-position: -160px -64px; } +.ui-icon-arrowrefresh-1-s { background-position: -176px -64px; } +.ui-icon-arrow-4 { background-position: 0 -80px; } +.ui-icon-arrow-4-diag { background-position: -16px -80px; } +.ui-icon-extlink { background-position: -32px -80px; } +.ui-icon-newwin { background-position: -48px -80px; } +.ui-icon-refresh { background-position: -64px -80px; } +.ui-icon-shuffle { background-position: -80px -80px; } +.ui-icon-transfer-e-w { background-position: -96px -80px; } +.ui-icon-transferthick-e-w { background-position: -112px -80px; } +.ui-icon-folder-collapsed { background-position: 0 -96px; } +.ui-icon-folder-open { background-position: -16px -96px; } +.ui-icon-document { background-position: -32px -96px; } +.ui-icon-document-b { background-position: -48px -96px; } +.ui-icon-note { background-position: -64px -96px; } +.ui-icon-mail-closed { background-position: -80px -96px; } +.ui-icon-mail-open { background-position: -96px -96px; } +.ui-icon-suitcase { background-position: -112px -96px; } +.ui-icon-comment { background-position: -128px -96px; } +.ui-icon-person { background-position: -144px -96px; } +.ui-icon-print { background-position: -160px -96px; } +.ui-icon-trash { background-position: -176px -96px; } +.ui-icon-locked { background-position: -192px -96px; } +.ui-icon-unlocked { background-position: -208px -96px; } +.ui-icon-bookmark { background-position: -224px -96px; } +.ui-icon-tag { background-position: -240px -96px; } +.ui-icon-home { background-position: 0 -112px; } +.ui-icon-flag { background-position: -16px -112px; } +.ui-icon-calendar { background-position: -32px -112px; } +.ui-icon-cart { background-position: -48px -112px; } +.ui-icon-pencil { background-position: -64px -112px; } +.ui-icon-clock { background-position: -80px -112px; } +.ui-icon-disk { background-position: -96px -112px; } +.ui-icon-calculator { background-position: -112px -112px; } +.ui-icon-zoomin { background-position: -128px -112px; } +.ui-icon-zoomout { background-position: -144px -112px; } +.ui-icon-search { background-position: -160px -112px; } +.ui-icon-wrench { background-position: -176px -112px; } +.ui-icon-gear { background-position: -192px -112px; } +.ui-icon-heart { background-position: -208px -112px; } +.ui-icon-star { background-position: -224px -112px; } +.ui-icon-link { background-position: -240px -112px; } +.ui-icon-cancel { background-position: 0 -128px; } +.ui-icon-plus { background-position: -16px -128px; } +.ui-icon-plusthick { background-position: -32px -128px; } +.ui-icon-minus { background-position: -48px -128px; } +.ui-icon-minusthick { background-position: -64px -128px; } +.ui-icon-close { background-position: -80px -128px; } +.ui-icon-closethick { background-position: -96px -128px; } +.ui-icon-key { background-position: -112px -128px; } +.ui-icon-lightbulb { background-position: -128px -128px; } +.ui-icon-scissors { background-position: -144px -128px; } +.ui-icon-clipboard { background-position: -160px -128px; } +.ui-icon-copy { background-position: -176px -128px; } +.ui-icon-contact { background-position: -192px -128px; } +.ui-icon-image { background-position: -208px -128px; } +.ui-icon-video { background-position: -224px -128px; } +.ui-icon-script { background-position: -240px -128px; } +.ui-icon-alert { background-position: 0 -144px; } +.ui-icon-info { background-position: -16px -144px; } +.ui-icon-notice { background-position: -32px -144px; } +.ui-icon-help { background-position: -48px -144px; } +.ui-icon-check { background-position: -64px -144px; } +.ui-icon-bullet { background-position: -80px -144px; } +.ui-icon-radio-off { background-position: -96px -144px; } +.ui-icon-radio-on { background-position: -112px -144px; } +.ui-icon-pin-w { background-position: -128px -144px; } +.ui-icon-pin-s { background-position: -144px -144px; } +.ui-icon-play { background-position: 0 -160px; } +.ui-icon-pause { background-position: -16px -160px; } +.ui-icon-seek-next { background-position: -32px -160px; } +.ui-icon-seek-prev { background-position: -48px -160px; } +.ui-icon-seek-end { background-position: -64px -160px; } +.ui-icon-seek-start { background-position: -80px -160px; } +/* ui-icon-seek-first is deprecated, use ui-icon-seek-start instead */ +.ui-icon-seek-first { background-position: -80px -160px; } +.ui-icon-stop { background-position: -96px -160px; } +.ui-icon-eject { background-position: -112px -160px; } +.ui-icon-volume-off { background-position: -128px -160px; } +.ui-icon-volume-on { background-position: -144px -160px; } +.ui-icon-power { background-position: 0 -176px; } +.ui-icon-signal-diag { background-position: -16px -176px; } +.ui-icon-signal { background-position: -32px -176px; } +.ui-icon-battery-0 { background-position: -48px -176px; } +.ui-icon-battery-1 { background-position: -64px -176px; } +.ui-icon-battery-2 { background-position: -80px -176px; } +.ui-icon-battery-3 { background-position: -96px -176px; } +.ui-icon-circle-plus { background-position: 0 -192px; } +.ui-icon-circle-minus { background-position: -16px -192px; } +.ui-icon-circle-close { background-position: -32px -192px; } +.ui-icon-circle-triangle-e { background-position: -48px -192px; } +.ui-icon-circle-triangle-s { background-position: -64px -192px; } +.ui-icon-circle-triangle-w { background-position: -80px -192px; } +.ui-icon-circle-triangle-n { background-position: -96px -192px; } +.ui-icon-circle-arrow-e { background-position: -112px -192px; } +.ui-icon-circle-arrow-s { background-position: -128px -192px; } +.ui-icon-circle-arrow-w { background-position: -144px -192px; } +.ui-icon-circle-arrow-n { background-position: -160px -192px; } +.ui-icon-circle-zoomin { background-position: -176px -192px; } +.ui-icon-circle-zoomout { background-position: -192px -192px; } +.ui-icon-circle-check { background-position: -208px -192px; } +.ui-icon-circlesmall-plus { background-position: 0 -208px; } +.ui-icon-circlesmall-minus { background-position: -16px -208px; } +.ui-icon-circlesmall-close { background-position: -32px -208px; } +.ui-icon-squaresmall-plus { background-position: -48px -208px; } +.ui-icon-squaresmall-minus { background-position: -64px -208px; } +.ui-icon-squaresmall-close { background-position: -80px -208px; } +.ui-icon-grip-dotted-vertical { background-position: 0 -224px; } +.ui-icon-grip-dotted-horizontal { background-position: -16px -224px; } +.ui-icon-grip-solid-vertical { background-position: -32px -224px; } +.ui-icon-grip-solid-horizontal { background-position: -48px -224px; } +.ui-icon-gripsmall-diagonal-se { background-position: -64px -224px; } +.ui-icon-grip-diagonal-se { background-position: -80px -224px; } + + +/* Misc visuals +----------------------------------*/ + +/* Corner radius */ +.ui-corner-all, .ui-corner-top, .ui-corner-left, .ui-corner-tl { -moz-border-radius-topleft: 4px; -webkit-border-top-left-radius: 4px; -khtml-border-top-left-radius: 4px; border-top-left-radius: 4px; } +.ui-corner-all, .ui-corner-top, .ui-corner-right, .ui-corner-tr { -moz-border-radius-topright: 4px; -webkit-border-top-right-radius: 4px; -khtml-border-top-right-radius: 4px; border-top-right-radius: 4px; } +.ui-corner-all, .ui-corner-bottom, .ui-corner-left, .ui-corner-bl { -moz-border-radius-bottomleft: 4px; -webkit-border-bottom-left-radius: 4px; -khtml-border-bottom-left-radius: 4px; border-bottom-left-radius: 4px; } +.ui-corner-all, .ui-corner-bottom, .ui-corner-right, .ui-corner-br { -moz-border-radius-bottomright: 4px; -webkit-border-bottom-right-radius: 4px; -khtml-border-bottom-right-radius: 4px; border-bottom-right-radius: 4px; } + +/* Overlays */ +.ui-widget-overlay { background: #aaaaaa url(images/ui-bg_flat_0_aaaaaa_40x100.png) 50% 50% repeat-x; opacity: .30;filter:Alpha(Opacity=30); } +.ui-widget-shadow { margin: -8px 0 0 -8px; padding: 8px; background: #aaaaaa url(images/ui-bg_flat_0_aaaaaa_40x100.png) 50% 50% repeat-x; opacity: .30;filter:Alpha(Opacity=30); -moz-border-radius: 8px; -khtml-border-radius: 8px; -webkit-border-radius: 8px; border-radius: 8px; }/*! + * jQuery UI Slider 1.8.21 + * + * Copyright 2012, AUTHORS.txt (http://jqueryui.com/about) + * Dual licensed under the MIT or GPL Version 2 licenses. + * http://jquery.org/license + * + * http://docs.jquery.com/UI/Slider#theming + */ +.ui-slider { position: relative; text-align: left; } +.ui-slider .ui-slider-handle { position: absolute; z-index: 2; width: 1.2em; height: 1.2em; cursor: default; } +.ui-slider .ui-slider-range { position: absolute; z-index: 1; font-size: .7em; display: block; border: 0; background-position: 0 0; } + +.ui-slider-horizontal { height: .8em; } +.ui-slider-horizontal .ui-slider-handle { top: -.3em; margin-left: -.6em; } +.ui-slider-horizontal .ui-slider-range { top: 0; height: 100%; } +.ui-slider-horizontal .ui-slider-range-min { left: 0; } +.ui-slider-horizontal .ui-slider-range-max { right: 0; } + 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100%; list-style: none; } +.ui-helper-clearfix:before, .ui-helper-clearfix:after { content: ""; display: table; } +.ui-helper-clearfix:after { clear: both; } +.ui-helper-clearfix { zoom: 1; } +.ui-helper-zfix { width: 100%; height: 100%; top: 0; left: 0; position: absolute; opacity: 0; filter:Alpha(Opacity=0); } + + +/* Interaction Cues +----------------------------------*/ +.ui-state-disabled { cursor: default !important; } + + +/* Icons +----------------------------------*/ + +/* states and images */ +.ui-icon { display: block; text-indent: -99999px; overflow: hidden; background-repeat: no-repeat; } + + +/* Misc visuals +----------------------------------*/ + +/* Overlays */ +.ui-widget-overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; } + + +/*! + * jQuery UI CSS Framework 1.8.21 + * + * Copyright 2012, AUTHORS.txt (http://jqueryui.com/about) + * Dual licensed under the MIT or GPL Version 2 licenses. + * http://jquery.org/license + * + * http://docs.jquery.com/UI/Theming/API + * + * To view and modify this theme, visit http://jqueryui.com/themeroller/?ffDefault=Trebuchet%20MS,%20Tahoma,%20Verdana,%20Arial,%20sans-serif&fwDefault=bold&fsDefault=1.1em&cornerRadius=4px&bgColorHeader=f6a828&bgTextureHeader=12_gloss_wave.png&bgImgOpacityHeader=35&borderColorHeader=e78f08&fcHeader=ffffff&iconColorHeader=ffffff&bgColorContent=eeeeee&bgTextureContent=03_highlight_soft.png&bgImgOpacityContent=100&borderColorContent=dddddd&fcContent=333333&iconColorContent=222222&bgColorDefault=f6f6f6&bgTextureDefault=02_glass.png&bgImgOpacityDefault=100&borderColorDefault=cccccc&fcDefault=1c94c4&iconColorDefault=ef8c08&bgColorHover=fdf5ce&bgTextureHover=02_glass.png&bgImgOpacityHover=100&borderColorHover=fbcb09&fcHover=c77405&iconColorHover=ef8c08&bgColorActive=ffffff&bgTextureActive=02_glass.png&bgImgOpacityActive=65&borderColorActive=fbd850&fcActive=eb8f00&iconColorActive=ef8c08&bgColorHighlight=ffe45c&bgTextureHighlight=03_highlight_soft.png&bgImgOpacityHighlight=75&borderColorHighlight=fed22f&fcHighlight=363636&iconColorHighlight=228ef1&bgColorError=b81900&bgTextureError=08_diagonals_thick.png&bgImgOpacityError=18&borderColorError=cd0a0a&fcError=ffffff&iconColorError=ffd27a&bgColorOverlay=666666&bgTextureOverlay=08_diagonals_thick.png&bgImgOpacityOverlay=20&opacityOverlay=50&bgColorShadow=000000&bgTextureShadow=01_flat.png&bgImgOpacityShadow=10&opacityShadow=20&thicknessShadow=5px&offsetTopShadow=-5px&offsetLeftShadow=-5px&cornerRadiusShadow=5px + */ + + +/* Component containers +----------------------------------*/ +.ui-widget { font-family: Trebuchet MS, Tahoma, Verdana, Arial, sans-serif; font-size: 1.1em; } +.ui-widget .ui-widget { font-size: 1em; } +.ui-widget input, .ui-widget select, .ui-widget textarea, .ui-widget button { font-family: Trebuchet MS, Tahoma, Verdana, Arial, sans-serif; font-size: 1em; } +.ui-widget-content { border: 1px solid #dddddd; background: #eeeeee url(images/ui-bg_highlight-soft_100_eeeeee_1x100.png) 50% top repeat-x; color: #333333; } +.ui-widget-content a { color: #333333; } +.ui-widget-header { border: 1px solid #e78f08; background: #f6a828 url(images/ui-bg_gloss-wave_35_f6a828_500x100.png) 50% 50% repeat-x; color: #ffffff; font-weight: bold; } +.ui-widget-header a { color: #ffffff; } + +/* Interaction states +----------------------------------*/ +.ui-state-default, .ui-widget-content .ui-state-default, .ui-widget-header .ui-state-default { border: 1px solid #cccccc; background: #f6f6f6 url(images/ui-bg_glass_100_f6f6f6_1x400.png) 50% 50% repeat-x; font-weight: bold; color: #1c94c4; } +.ui-state-default a, .ui-state-default a:link, .ui-state-default a:visited { color: #1c94c4; text-decoration: none; } +.ui-state-hover, .ui-widget-content .ui-state-hover, .ui-widget-header .ui-state-hover, .ui-state-focus, .ui-widget-content .ui-state-focus, .ui-widget-header .ui-state-focus { border: 1px solid #fbcb09; background: #fdf5ce url(images/ui-bg_glass_100_fdf5ce_1x400.png) 50% 50% repeat-x; font-weight: bold; color: #c77405; } +.ui-state-hover a, .ui-state-hover a:hover { color: #c77405; text-decoration: none; } +.ui-state-active, .ui-widget-content .ui-state-active, .ui-widget-header .ui-state-active { border: 1px solid #fbd850; background: #ffffff url(images/ui-bg_glass_65_ffffff_1x400.png) 50% 50% repeat-x; font-weight: bold; color: #eb8f00; } +.ui-state-active a, .ui-state-active a:link, .ui-state-active a:visited { color: #eb8f00; text-decoration: none; } +.ui-widget :active { outline: none; } + +/* Interaction Cues +----------------------------------*/ +.ui-state-highlight, .ui-widget-content .ui-state-highlight, .ui-widget-header .ui-state-highlight {border: 1px solid #fed22f; background: #ffe45c url(images/ui-bg_highlight-soft_75_ffe45c_1x100.png) 50% top repeat-x; color: #363636; } +.ui-state-highlight a, .ui-widget-content .ui-state-highlight a,.ui-widget-header .ui-state-highlight a { color: #363636; } +.ui-state-error, .ui-widget-content .ui-state-error, .ui-widget-header .ui-state-error {border: 1px solid #cd0a0a; background: #b81900 url(images/ui-bg_diagonals-thick_18_b81900_40x40.png) 50% 50% repeat; color: #ffffff; } +.ui-state-error a, .ui-widget-content .ui-state-error a, .ui-widget-header .ui-state-error a { color: #ffffff; } +.ui-state-error-text, .ui-widget-content .ui-state-error-text, .ui-widget-header .ui-state-error-text { color: #ffffff; } +.ui-priority-primary, .ui-widget-content .ui-priority-primary, .ui-widget-header .ui-priority-primary { font-weight: bold; } +.ui-priority-secondary, .ui-widget-content .ui-priority-secondary, .ui-widget-header .ui-priority-secondary { opacity: .7; filter:Alpha(Opacity=70); font-weight: normal; } +.ui-state-disabled, .ui-widget-content .ui-state-disabled, .ui-widget-header .ui-state-disabled { opacity: .35; filter:Alpha(Opacity=35); background-image: none; } + +/* Icons +----------------------------------*/ + +/* states and images */ +.ui-icon { width: 16px; height: 16px; background-image: url(images/ui-icons_222222_256x240.png); } +.ui-widget-content .ui-icon {background-image: url(images/ui-icons_222222_256x240.png); } +.ui-widget-header .ui-icon {background-image: url(images/ui-icons_ffffff_256x240.png); } +.ui-state-default .ui-icon { background-image: url(images/ui-icons_ef8c08_256x240.png); } +.ui-state-hover .ui-icon, .ui-state-focus .ui-icon {background-image: url(images/ui-icons_ef8c08_256x240.png); } +.ui-state-active .ui-icon {background-image: url(images/ui-icons_ef8c08_256x240.png); } +.ui-state-highlight .ui-icon {background-image: url(images/ui-icons_228ef1_256x240.png); } +.ui-state-error .ui-icon, .ui-state-error-text .ui-icon {background-image: url(images/ui-icons_ffd27a_256x240.png); } + +/* positioning */ +.ui-icon-carat-1-n { background-position: 0 0; } +.ui-icon-carat-1-ne { background-position: -16px 0; } +.ui-icon-carat-1-e { background-position: -32px 0; } +.ui-icon-carat-1-se { background-position: -48px 0; } +.ui-icon-carat-1-s { background-position: -64px 0; } +.ui-icon-carat-1-sw { background-position: -80px 0; } +.ui-icon-carat-1-w { background-position: -96px 0; } +.ui-icon-carat-1-nw { background-position: -112px 0; } +.ui-icon-carat-2-n-s { background-position: -128px 0; } +.ui-icon-carat-2-e-w { background-position: -144px 0; } +.ui-icon-triangle-1-n { background-position: 0 -16px; } +.ui-icon-triangle-1-ne { background-position: -16px -16px; } +.ui-icon-triangle-1-e { background-position: -32px -16px; } +.ui-icon-triangle-1-se { background-position: -48px -16px; } +.ui-icon-triangle-1-s { background-position: -64px -16px; } +.ui-icon-triangle-1-sw { background-position: -80px -16px; } +.ui-icon-triangle-1-w { background-position: -96px -16px; } +.ui-icon-triangle-1-nw { background-position: -112px -16px; } +.ui-icon-triangle-2-n-s { background-position: -128px -16px; } +.ui-icon-triangle-2-e-w { background-position: -144px -16px; } +.ui-icon-arrow-1-n { background-position: 0 -32px; } +.ui-icon-arrow-1-ne { background-position: -16px -32px; } +.ui-icon-arrow-1-e { background-position: -32px -32px; } +.ui-icon-arrow-1-se { background-position: -48px -32px; } +.ui-icon-arrow-1-s { background-position: -64px -32px; } +.ui-icon-arrow-1-sw { background-position: -80px -32px; } +.ui-icon-arrow-1-w { background-position: -96px -32px; } +.ui-icon-arrow-1-nw { background-position: -112px -32px; } +.ui-icon-arrow-2-n-s { background-position: -128px -32px; } +.ui-icon-arrow-2-ne-sw { background-position: -144px -32px; } +.ui-icon-arrow-2-e-w { background-position: -160px -32px; } +.ui-icon-arrow-2-se-nw { background-position: -176px -32px; } +.ui-icon-arrowstop-1-n { background-position: -192px -32px; } +.ui-icon-arrowstop-1-e { background-position: -208px -32px; } +.ui-icon-arrowstop-1-s { background-position: -224px -32px; } +.ui-icon-arrowstop-1-w { background-position: -240px -32px; } +.ui-icon-arrowthick-1-n { background-position: 0 -48px; } +.ui-icon-arrowthick-1-ne { background-position: -16px -48px; } +.ui-icon-arrowthick-1-e { background-position: -32px -48px; } +.ui-icon-arrowthick-1-se { background-position: -48px -48px; } +.ui-icon-arrowthick-1-s { background-position: -64px -48px; } +.ui-icon-arrowthick-1-sw { background-position: -80px -48px; } +.ui-icon-arrowthick-1-w { background-position: -96px -48px; } +.ui-icon-arrowthick-1-nw { background-position: -112px -48px; } +.ui-icon-arrowthick-2-n-s { background-position: -128px -48px; } +.ui-icon-arrowthick-2-ne-sw { background-position: -144px -48px; } +.ui-icon-arrowthick-2-e-w { background-position: -160px -48px; } +.ui-icon-arrowthick-2-se-nw { background-position: -176px -48px; } +.ui-icon-arrowthickstop-1-n { background-position: -192px -48px; } +.ui-icon-arrowthickstop-1-e { background-position: -208px -48px; } +.ui-icon-arrowthickstop-1-s { background-position: -224px -48px; } +.ui-icon-arrowthickstop-1-w { background-position: -240px -48px; } +.ui-icon-arrowreturnthick-1-w { background-position: 0 -64px; } +.ui-icon-arrowreturnthick-1-n { background-position: -16px -64px; } +.ui-icon-arrowreturnthick-1-e { background-position: -32px -64px; } +.ui-icon-arrowreturnthick-1-s { background-position: -48px -64px; } +.ui-icon-arrowreturn-1-w { background-position: -64px -64px; } +.ui-icon-arrowreturn-1-n { background-position: -80px -64px; } +.ui-icon-arrowreturn-1-e { background-position: -96px -64px; } +.ui-icon-arrowreturn-1-s { background-position: -112px -64px; } +.ui-icon-arrowrefresh-1-w { background-position: -128px -64px; } +.ui-icon-arrowrefresh-1-n { background-position: -144px -64px; } +.ui-icon-arrowrefresh-1-e { background-position: -160px -64px; } +.ui-icon-arrowrefresh-1-s { background-position: -176px -64px; } +.ui-icon-arrow-4 { background-position: 0 -80px; } +.ui-icon-arrow-4-diag { background-position: -16px -80px; } +.ui-icon-extlink { background-position: -32px -80px; } +.ui-icon-newwin { background-position: -48px -80px; } +.ui-icon-refresh { background-position: -64px -80px; } +.ui-icon-shuffle { background-position: -80px -80px; } +.ui-icon-transfer-e-w { background-position: -96px -80px; } +.ui-icon-transferthick-e-w { background-position: -112px -80px; } +.ui-icon-folder-collapsed { background-position: 0 -96px; } +.ui-icon-folder-open { background-position: -16px -96px; } +.ui-icon-document { background-position: -32px -96px; } +.ui-icon-document-b { background-position: -48px -96px; } +.ui-icon-note { background-position: -64px -96px; } +.ui-icon-mail-closed { background-position: -80px -96px; } +.ui-icon-mail-open { background-position: -96px -96px; } +.ui-icon-suitcase { background-position: -112px -96px; } +.ui-icon-comment { background-position: -128px -96px; } +.ui-icon-person { background-position: -144px -96px; } +.ui-icon-print { background-position: -160px -96px; } +.ui-icon-trash { background-position: -176px -96px; } +.ui-icon-locked { background-position: -192px -96px; } +.ui-icon-unlocked { background-position: -208px -96px; } +.ui-icon-bookmark { background-position: -224px -96px; } +.ui-icon-tag { background-position: -240px -96px; } +.ui-icon-home { background-position: 0 -112px; } +.ui-icon-flag { background-position: -16px -112px; } +.ui-icon-calendar { background-position: -32px -112px; } +.ui-icon-cart { background-position: -48px -112px; } +.ui-icon-pencil { background-position: -64px -112px; } +.ui-icon-clock { background-position: -80px -112px; } +.ui-icon-disk { background-position: -96px -112px; } +.ui-icon-calculator { background-position: -112px -112px; } +.ui-icon-zoomin { background-position: -128px -112px; } +.ui-icon-zoomout { background-position: -144px -112px; } +.ui-icon-search { background-position: -160px -112px; } +.ui-icon-wrench { background-position: -176px -112px; } +.ui-icon-gear { background-position: -192px -112px; } +.ui-icon-heart { background-position: -208px -112px; } +.ui-icon-star { background-position: -224px -112px; } +.ui-icon-link { background-position: -240px -112px; } +.ui-icon-cancel { background-position: 0 -128px; } +.ui-icon-plus { background-position: -16px -128px; } +.ui-icon-plusthick { background-position: -32px -128px; } +.ui-icon-minus { background-position: -48px -128px; } +.ui-icon-minusthick { background-position: -64px -128px; } +.ui-icon-close { background-position: -80px -128px; } +.ui-icon-closethick { background-position: -96px -128px; } +.ui-icon-key { background-position: -112px -128px; } +.ui-icon-lightbulb { background-position: -128px -128px; } +.ui-icon-scissors { background-position: -144px -128px; } +.ui-icon-clipboard { background-position: -160px -128px; } +.ui-icon-copy { background-position: -176px -128px; } +.ui-icon-contact { background-position: -192px -128px; } +.ui-icon-image { background-position: -208px -128px; } +.ui-icon-video { background-position: -224px -128px; } +.ui-icon-script { background-position: -240px -128px; } +.ui-icon-alert { background-position: 0 -144px; } +.ui-icon-info { background-position: -16px -144px; } +.ui-icon-notice { background-position: -32px -144px; } +.ui-icon-help { background-position: -48px -144px; } +.ui-icon-check { background-position: -64px -144px; } +.ui-icon-bullet { background-position: -80px -144px; } +.ui-icon-radio-off { background-position: -96px -144px; } +.ui-icon-radio-on { background-position: -112px -144px; } +.ui-icon-pin-w { background-position: -128px -144px; } +.ui-icon-pin-s { background-position: -144px -144px; } +.ui-icon-play { background-position: 0 -160px; } +.ui-icon-pause { background-position: -16px -160px; } +.ui-icon-seek-next { background-position: -32px -160px; } +.ui-icon-seek-prev { background-position: -48px -160px; } +.ui-icon-seek-end { background-position: -64px -160px; } +.ui-icon-seek-start { background-position: -80px -160px; } +/* ui-icon-seek-first is deprecated, use ui-icon-seek-start instead */ +.ui-icon-seek-first { background-position: -80px -160px; } +.ui-icon-stop { background-position: -96px -160px; } +.ui-icon-eject { background-position: -112px -160px; } +.ui-icon-volume-off { background-position: -128px -160px; } +.ui-icon-volume-on { background-position: -144px -160px; } +.ui-icon-power { background-position: 0 -176px; } +.ui-icon-signal-diag { background-position: -16px -176px; } +.ui-icon-signal { background-position: -32px -176px; } +.ui-icon-battery-0 { background-position: -48px -176px; } +.ui-icon-battery-1 { background-position: -64px -176px; } +.ui-icon-battery-2 { background-position: -80px -176px; } +.ui-icon-battery-3 { background-position: -96px -176px; } +.ui-icon-circle-plus { background-position: 0 -192px; } +.ui-icon-circle-minus { background-position: -16px -192px; } +.ui-icon-circle-close { background-position: -32px -192px; } +.ui-icon-circle-triangle-e { background-position: -48px -192px; } +.ui-icon-circle-triangle-s { background-position: -64px -192px; } +.ui-icon-circle-triangle-w { background-position: -80px -192px; } +.ui-icon-circle-triangle-n { background-position: -96px -192px; } +.ui-icon-circle-arrow-e { background-position: -112px -192px; } +.ui-icon-circle-arrow-s { background-position: -128px -192px; } +.ui-icon-circle-arrow-w { background-position: -144px -192px; } +.ui-icon-circle-arrow-n { background-position: -160px -192px; } +.ui-icon-circle-zoomin { background-position: -176px -192px; } +.ui-icon-circle-zoomout { background-position: -192px -192px; } +.ui-icon-circle-check { background-position: -208px -192px; } +.ui-icon-circlesmall-plus { background-position: 0 -208px; } +.ui-icon-circlesmall-minus { background-position: -16px -208px; } +.ui-icon-circlesmall-close { background-position: -32px -208px; } +.ui-icon-squaresmall-plus { background-position: -48px -208px; } +.ui-icon-squaresmall-minus { background-position: -64px -208px; } +.ui-icon-squaresmall-close { background-position: -80px -208px; } +.ui-icon-grip-dotted-vertical { background-position: 0 -224px; } +.ui-icon-grip-dotted-horizontal { background-position: -16px -224px; } +.ui-icon-grip-solid-vertical { background-position: -32px -224px; } +.ui-icon-grip-solid-horizontal { background-position: -48px -224px; } +.ui-icon-gripsmall-diagonal-se { background-position: -64px -224px; } +.ui-icon-grip-diagonal-se { background-position: -80px -224px; } + + +/* Misc visuals +----------------------------------*/ + +/* Corner radius */ +.ui-corner-all, .ui-corner-top, .ui-corner-left, .ui-corner-tl { -moz-border-radius-topleft: 4px; -webkit-border-top-left-radius: 4px; -khtml-border-top-left-radius: 4px; border-top-left-radius: 4px; } +.ui-corner-all, .ui-corner-top, .ui-corner-right, .ui-corner-tr { -moz-border-radius-topright: 4px; -webkit-border-top-right-radius: 4px; -khtml-border-top-right-radius: 4px; border-top-right-radius: 4px; } +.ui-corner-all, .ui-corner-bottom, .ui-corner-left, .ui-corner-bl { -moz-border-radius-bottomleft: 4px; -webkit-border-bottom-left-radius: 4px; -khtml-border-bottom-left-radius: 4px; border-bottom-left-radius: 4px; } +.ui-corner-all, .ui-corner-bottom, .ui-corner-right, .ui-corner-br { -moz-border-radius-bottomright: 4px; -webkit-border-bottom-right-radius: 4px; -khtml-border-bottom-right-radius: 4px; border-bottom-right-radius: 4px; } + +/* Overlays */ +.ui-widget-overlay { background: #666666 url(images/ui-bg_diagonals-thick_20_666666_40x40.png) 50% 50% repeat; opacity: .50;filter:Alpha(Opacity=50); } +.ui-widget-shadow { margin: -5px 0 0 -5px; padding: 5px; background: #000000 url(images/ui-bg_flat_10_000000_40x100.png) 50% 50% repeat-x; opacity: .20;filter:Alpha(Opacity=20); -moz-border-radius: 5px; -khtml-border-radius: 5px; -webkit-border-radius: 5px; border-radius: 5px; }/*! + * jQuery UI Slider 1.8.21 + * + * Copyright 2012, AUTHORS.txt (http://jqueryui.com/about) + * Dual licensed under the MIT or GPL Version 2 licenses. + * http://jquery.org/license + * + * http://docs.jquery.com/UI/Slider#theming + */ +.ui-slider { position: relative; text-align: left; } +.ui-slider .ui-slider-handle { position: absolute; z-index: 2; width: 1.2em; height: 1.2em; cursor: default; } +.ui-slider .ui-slider-range { position: absolute; z-index: 1; font-size: .7em; display: block; border: 0; background-position: 0 0; } + +.ui-slider-horizontal { height: .8em; } +.ui-slider-horizontal .ui-slider-handle { top: -.3em; margin-left: -.6em; } +.ui-slider-horizontal .ui-slider-range { top: 0; height: 100%; } +.ui-slider-horizontal .ui-slider-range-min { left: 0; } +.ui-slider-horizontal .ui-slider-range-max { right: 0; } + +.ui-slider-vertical { width: .8em; height: 100px; } +.ui-slider-vertical .ui-slider-handle { left: -.3em; margin-left: 0; margin-bottom: -.6em; } +.ui-slider-vertical .ui-slider-range { left: 0; width: 100%; } +.ui-slider-vertical .ui-slider-range-min { bottom: 0; } +.ui-slider-vertical .ui-slider-range-max { top: 0; } \ No newline at end of file diff --git a/PyTutorGAE/example-code b/PyTutorGAE/example-code new file mode 120000 index 000000000..153b6e23a --- /dev/null +++ b/PyTutorGAE/example-code @@ -0,0 +1 @@ +../example-code \ No newline at end of file diff --git a/PyTutorGAE/js/codemirror/codemirror.js b/PyTutorGAE/js/codemirror/codemirror.js new file mode 100644 index 000000000..532dd8974 --- /dev/null +++ b/PyTutorGAE/js/codemirror/codemirror.js @@ -0,0 +1,3231 @@ +// CodeMirror version 2.32 +// +// All functions that need access to the editor's state live inside +// the CodeMirror function. Below that, at the bottom of the file, +// some utilities are defined. + +// CodeMirror is the only global var we claim +var CodeMirror = (function() { + // This is the function that produces an editor instance. Its + // closure is used to store the editor state. + function CodeMirror(place, givenOptions) { + // Determine effective options based on given values and defaults. + var options = {}, defaults = CodeMirror.defaults; + for (var opt in defaults) + if (defaults.hasOwnProperty(opt)) + options[opt] = (givenOptions && givenOptions.hasOwnProperty(opt) ? givenOptions : defaults)[opt]; + + // The element in which the editor lives. + var wrapper = document.createElement("div"); + wrapper.className = "CodeMirror" + (options.lineWrapping ? " CodeMirror-wrap" : ""); + // This mess creates the base DOM structure for the editor. + wrapper.innerHTML = + '

' + // Wraps and hides input textarea + '
' + + '
' + // The vertical scrollbar. Horizontal scrolling is handled by the scroller itself. + '
' + // The empty scrollbar content, used solely for managing the scrollbar thumb. + '
' + // This must be before the scroll area because it's float-right. + '
' + + '
' + // Set to the height of the text, causes scrolling + '
' + // Moved around its parent to cover visible view + '
' + + // Provides positioning relative to (visible) text origin + '
' + + // Used to measure text size + '
' + + '
 
' + // Absolutely positioned blinky cursor + '' + // Used to force a width + '
' + // DIVs containing the selection and the actual code + '
'; + if (place.appendChild) place.appendChild(wrapper); else place(wrapper); + // I've never seen more elegant code in my life. + var inputDiv = wrapper.firstChild, input = inputDiv.firstChild, + scroller = wrapper.lastChild, code = scroller.firstChild, + mover = code.firstChild, gutter = mover.firstChild, gutterText = gutter.firstChild, + lineSpace = gutter.nextSibling.firstChild, measure = lineSpace.firstChild, + cursor = measure.nextSibling, widthForcer = cursor.nextSibling, + selectionDiv = widthForcer.nextSibling, lineDiv = selectionDiv.nextSibling, + scrollbar = inputDiv.nextSibling, scrollbarInner = scrollbar.firstChild; + themeChanged(); keyMapChanged(); + // Needed to hide big blue blinking cursor on Mobile Safari + if (ios) input.style.width = "0px"; + if (!webkit) scroller.draggable = true; + lineSpace.style.outline = "none"; + if (options.tabindex != null) input.tabIndex = options.tabindex; + if (options.autofocus) focusInput(); + if (!options.gutter && !options.lineNumbers) gutter.style.display = "none"; + // Needed to handle Tab key in KHTML + if (khtml) inputDiv.style.height = "1px", inputDiv.style.position = "absolute"; + + // Check for OS X >= 10.7. If so, we need to force a width on the scrollbar, and + // make it overlap the content. (But we only do this if the scrollbar doesn't already + // have a natural width. If the mouse is plugged in or the user sets the system pref + // to always show scrollbars, the scrollbar shouldn't overlap.) + if (mac_geLion) { + scrollbar.className += (overlapScrollbars() ? " cm-sb-overlap" : " cm-sb-nonoverlap"); + } else if (ie_lt8) { + // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8). + scrollbar.className += " cm-sb-ie7"; + } + + // Check for problem with IE innerHTML not working when we have a + // P (or similar) parent node. + try { stringWidth("x"); } + catch (e) { + if (e.message.match(/runtime/i)) + e = new Error("A CodeMirror inside a P-style element does not work in Internet Explorer. (innerHTML bug)"); + throw e; + } + + // Delayed object wrap timeouts, making sure only one is active. blinker holds an interval. + var poll = new Delayed(), highlight = new Delayed(), blinker; + + // mode holds a mode API object. doc is the tree of Line objects, + // work an array of lines that should be parsed, and history the + // undo history (instance of History constructor). + var mode, doc = new BranchChunk([new LeafChunk([new Line("")])]), work, focused; + loadMode(); + // The selection. These are always maintained to point at valid + // positions. Inverted is used to remember that the user is + // selecting bottom-to-top. + var sel = {from: {line: 0, ch: 0}, to: {line: 0, ch: 0}, inverted: false}; + // Selection-related flags. shiftSelecting obviously tracks + // whether the user is holding shift. + var shiftSelecting, lastClick, lastDoubleClick, lastScrollTop = 0, lastScrollLeft = 0, draggingText, + overwrite = false, suppressEdits = false; + // Variables used by startOperation/endOperation to track what + // happened during the operation. + var updateInput, userSelChange, changes, textChanged, selectionChanged, leaveInputAlone, + gutterDirty, callbacks; + // Current visible range (may be bigger than the view window). + var displayOffset = 0, showingFrom = 0, showingTo = 0, lastSizeC = 0; + // bracketHighlighted is used to remember that a bracket has been + // marked. + var bracketHighlighted; + // Tracks the maximum line length so that the horizontal scrollbar + // can be kept static when scrolling. + var maxLine = "", updateMaxLine = false, maxLineChanged = true; + var tabCache = {}; + + // Initialize the content. + operation(function(){setValue(options.value || ""); updateInput = false;})(); + var history = new History(); + + // Register our event handlers. + connect(scroller, "mousedown", operation(onMouseDown)); + connect(scroller, "dblclick", operation(onDoubleClick)); + connect(lineSpace, "selectstart", e_preventDefault); + // Gecko browsers fire contextmenu *after* opening the menu, at + // which point we can't mess with it anymore. Context menu is + // handled in onMouseDown for Gecko. + if (!gecko) connect(scroller, "contextmenu", onContextMenu); + connect(scroller, "scroll", onScroll); + connect(scrollbar, "scroll", onScroll); + connect(scrollbar, "mousedown", function() {if (focused) setTimeout(focusInput, 0);}); + connect(scroller, "mousewheel", onMouseWheel); + connect(scroller, "DOMMouseScroll", onMouseWheel); + connect(window, "resize", function() {updateDisplay(true);}); + connect(input, "keyup", operation(onKeyUp)); + connect(input, "input", fastPoll); + connect(input, "keydown", operation(onKeyDown)); + connect(input, "keypress", operation(onKeyPress)); + connect(input, "focus", onFocus); + connect(input, "blur", onBlur); + + if (options.dragDrop) { + connect(scroller, "dragstart", onDragStart); + function drag_(e) { + if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return; + e_stop(e); + } + connect(scroller, "dragenter", drag_); + connect(scroller, "dragover", drag_); + connect(scroller, "drop", operation(onDrop)); + } + connect(scroller, "paste", function(){focusInput(); fastPoll();}); + connect(input, "paste", fastPoll); + connect(input, "cut", operation(function(){ + if (!options.readOnly) replaceSelection(""); + })); + + // Needed to handle Tab key in KHTML + if (khtml) connect(code, "mouseup", function() { + if (document.activeElement == input) input.blur(); + focusInput(); + }); + + // IE throws unspecified error in certain cases, when + // trying to access activeElement before onload + var hasFocus; try { hasFocus = (document.activeElement == input); } catch(e) { } + if (hasFocus || options.autofocus) setTimeout(onFocus, 20); + else onBlur(); + + function isLine(l) {return l >= 0 && l < doc.size;} + // The instance object that we'll return. Mostly calls out to + // local functions in the CodeMirror function. Some do some extra + // range checking and/or clipping. operation is used to wrap the + // call so that changes it makes are tracked, and the display is + // updated afterwards. + var instance = wrapper.CodeMirror = { + getValue: getValue, + setValue: operation(setValue), + getSelection: getSelection, + replaceSelection: operation(replaceSelection), + focus: function(){window.focus(); focusInput(); onFocus(); fastPoll();}, + setOption: function(option, value) { + var oldVal = options[option]; + options[option] = value; + if (option == "mode" || option == "indentUnit") loadMode(); + else if (option == "readOnly" && value == "nocursor") {onBlur(); input.blur();} + else if (option == "readOnly" && !value) {resetInput(true);} + else if (option == "theme") themeChanged(); + else if (option == "lineWrapping" && oldVal != value) operation(wrappingChanged)(); + else if (option == "tabSize") updateDisplay(true); + else if (option == "keyMap") keyMapChanged(); + if (option == "lineNumbers" || option == "gutter" || option == "firstLineNumber" || option == "theme") { + gutterChanged(); + updateDisplay(true); + } + }, + getOption: function(option) {return options[option];}, + undo: operation(undo), + redo: operation(redo), + indentLine: operation(function(n, dir) { + if (typeof dir != "string") { + if (dir == null) dir = options.smartIndent ? "smart" : "prev"; + else dir = dir ? "add" : "subtract"; + } + if (isLine(n)) indentLine(n, dir); + }), + indentSelection: operation(indentSelected), + historySize: function() {return {undo: history.done.length, redo: history.undone.length};}, + clearHistory: function() {history = new History();}, + setHistory: function(histData) { + history = new History(); + history.done = histData.done; + history.undone = histData.undone; + }, + getHistory: function() { + history.time = 0; + return {done: history.done.concat([]), undone: history.undone.concat([])}; + }, + matchBrackets: operation(function(){matchBrackets(true);}), + getTokenAt: operation(function(pos) { + pos = clipPos(pos); + return getLine(pos.line).getTokenAt(mode, getStateBefore(pos.line), pos.ch); + }), + getStateAfter: function(line) { + line = clipLine(line == null ? doc.size - 1: line); + return getStateBefore(line + 1); + }, + cursorCoords: function(start, mode) { + if (start == null) start = sel.inverted; + return this.charCoords(start ? sel.from : sel.to, mode); + }, + charCoords: function(pos, mode) { + pos = clipPos(pos); + if (mode == "local") return localCoords(pos, false); + if (mode == "div") return localCoords(pos, true); + return pageCoords(pos); + }, + coordsChar: function(coords) { + var off = eltOffset(lineSpace); + return coordsChar(coords.x - off.left, coords.y - off.top); + }, + markText: operation(markText), + setBookmark: setBookmark, + findMarksAt: findMarksAt, + setMarker: operation(addGutterMarker), + clearMarker: operation(removeGutterMarker), + setLineClass: operation(setLineClass), + hideLine: operation(function(h) {return setLineHidden(h, true);}), + showLine: operation(function(h) {return setLineHidden(h, false);}), + onDeleteLine: function(line, f) { + if (typeof line == "number") { + if (!isLine(line)) return null; + line = getLine(line); + } + (line.handlers || (line.handlers = [])).push(f); + return line; + }, + lineInfo: lineInfo, + addWidget: function(pos, node, scroll, vert, horiz) { + pos = localCoords(clipPos(pos)); + var top = pos.yBot, left = pos.x; + node.style.position = "absolute"; + code.appendChild(node); + if (vert == "over") top = pos.y; + else if (vert == "near") { + var vspace = Math.max(scroller.offsetHeight, doc.height * textHeight()), + hspace = Math.max(code.clientWidth, lineSpace.clientWidth) - paddingLeft(); + if (pos.yBot + node.offsetHeight > vspace && pos.y > node.offsetHeight) + top = pos.y - node.offsetHeight; + if (left + node.offsetWidth > hspace) + left = hspace - node.offsetWidth; + } + node.style.top = (top + paddingTop()) + "px"; + node.style.left = node.style.right = ""; + if (horiz == "right") { + left = code.clientWidth - node.offsetWidth; + node.style.right = "0px"; + } else { + if (horiz == "left") left = 0; + else if (horiz == "middle") left = (code.clientWidth - node.offsetWidth) / 2; + node.style.left = (left + paddingLeft()) + "px"; + } + if (scroll) + scrollIntoView(left, top, left + node.offsetWidth, top + node.offsetHeight); + }, + + lineCount: function() {return doc.size;}, + clipPos: clipPos, + getCursor: function(start) { + if (start == null) start = sel.inverted; + return copyPos(start ? sel.from : sel.to); + }, + somethingSelected: function() {return !posEq(sel.from, sel.to);}, + setCursor: operation(function(line, ch, user) { + if (ch == null && typeof line.line == "number") setCursor(line.line, line.ch, user); + else setCursor(line, ch, user); + }), + setSelection: operation(function(from, to, user) { + (user ? setSelectionUser : setSelection)(clipPos(from), clipPos(to || from)); + }), + getLine: function(line) {if (isLine(line)) return getLine(line).text;}, + getLineHandle: function(line) {if (isLine(line)) return getLine(line);}, + setLine: operation(function(line, text) { + if (isLine(line)) replaceRange(text, {line: line, ch: 0}, {line: line, ch: getLine(line).text.length}); + }), + removeLine: operation(function(line) { + if (isLine(line)) replaceRange("", {line: line, ch: 0}, clipPos({line: line+1, ch: 0})); + }), + replaceRange: operation(replaceRange), + getRange: function(from, to, lineSep) {return getRange(clipPos(from), clipPos(to), lineSep);}, + + triggerOnKeyDown: operation(onKeyDown), + execCommand: function(cmd) {return commands[cmd](instance);}, + // Stuff used by commands, probably not much use to outside code. + moveH: operation(moveH), + deleteH: operation(deleteH), + moveV: operation(moveV), + toggleOverwrite: function() { + if(overwrite){ + overwrite = false; + cursor.className = cursor.className.replace(" CodeMirror-overwrite", ""); + } else { + overwrite = true; + cursor.className += " CodeMirror-overwrite"; + } + }, + + posFromIndex: function(off) { + var lineNo = 0, ch; + doc.iter(0, doc.size, function(line) { + var sz = line.text.length + 1; + if (sz > off) { ch = off; return true; } + off -= sz; + ++lineNo; + }); + return clipPos({line: lineNo, ch: ch}); + }, + indexFromPos: function (coords) { + if (coords.line < 0 || coords.ch < 0) return 0; + var index = coords.ch; + doc.iter(0, coords.line, function (line) { + index += line.text.length + 1; + }); + return index; + }, + scrollTo: function(x, y) { + if (x != null) scroller.scrollLeft = x; + if (y != null) scrollbar.scrollTop = y; + updateDisplay([]); + }, + getScrollInfo: function() { + return {x: scroller.scrollLeft, y: scrollbar.scrollTop, + height: scrollbar.scrollHeight, width: scroller.scrollWidth}; + }, + setSize: function(width, height) { + function interpret(val) { + val = String(val); + return /^\d+$/.test(val) ? val + "px" : val; + } + if (width != null) wrapper.style.width = interpret(width); + if (height != null) scroller.style.height = interpret(height); + }, + + operation: function(f){return operation(f)();}, + compoundChange: function(f){return compoundChange(f);}, + refresh: function(){ + updateDisplay(true, null, lastScrollTop); + if (scrollbar.scrollHeight > lastScrollTop) + scrollbar.scrollTop = lastScrollTop; + }, + getInputField: function(){return input;}, + getWrapperElement: function(){return wrapper;}, + getScrollerElement: function(){return scroller;}, + getGutterElement: function(){return gutter;} + }; + + function getLine(n) { return getLineAt(doc, n); } + function updateLineHeight(line, height) { + gutterDirty = true; + var diff = height - line.height; + for (var n = line; n; n = n.parent) n.height += diff; + } + + function setValue(code) { + var top = {line: 0, ch: 0}; + updateLines(top, {line: doc.size - 1, ch: getLine(doc.size-1).text.length}, + splitLines(code), top, top); + updateInput = true; + } + function getValue(lineSep) { + var text = []; + doc.iter(0, doc.size, function(line) { text.push(line.text); }); + return text.join(lineSep || "\n"); + } + + function onScroll(e) { + if (scroller.scrollTop) { + scrollbar.scrollTop += scroller.scrollTop; + scroller.scrollTop = 0; + } + if (lastScrollTop != scrollbar.scrollTop || lastScrollLeft != scroller.scrollLeft) { + lastScrollTop = scrollbar.scrollTop; + lastScrollLeft = scroller.scrollLeft; + updateDisplay([]); + if (options.fixedGutter) gutter.style.left = scroller.scrollLeft + "px"; + if (options.onScroll) options.onScroll(instance); + } + } + + function onMouseDown(e) { + setShift(e_prop(e, "shiftKey")); + // Check whether this is a click in a widget + for (var n = e_target(e); n != wrapper; n = n.parentNode) + if (n.parentNode == code && n != mover) return; + + // See if this is a click in the gutter + for (var n = e_target(e); n != wrapper; n = n.parentNode) + if (n.parentNode == gutterText) { + if (options.onGutterClick) + options.onGutterClick(instance, indexOf(gutterText.childNodes, n) + showingFrom, e); + return e_preventDefault(e); + } + + var start = posFromMouse(e); + + switch (e_button(e)) { + case 3: + if (gecko) onContextMenu(e); + return; + case 2: + if (start) setCursor(start.line, start.ch, true); + setTimeout(focusInput, 20); + e_preventDefault(e); + return; + } + // For button 1, if it was clicked inside the editor + // (posFromMouse returning non-null), we have to adjust the + // selection. + if (!start) {if (e_target(e) == scroller) e_preventDefault(e); return;} + + if (!focused) onFocus(); + + var now = +new Date, type = "single"; + if (lastDoubleClick && lastDoubleClick.time > now - 400 && posEq(lastDoubleClick.pos, start)) { + type = "triple"; + e_preventDefault(e); + setTimeout(focusInput, 20); + selectLine(start.line); + } else if (lastClick && lastClick.time > now - 400 && posEq(lastClick.pos, start)) { + type = "double"; + lastDoubleClick = {time: now, pos: start}; + e_preventDefault(e); + var word = findWordAt(start); + setSelectionUser(word.from, word.to); + } else { lastClick = {time: now, pos: start}; } + + var last = start, going; + if (options.dragDrop && dragAndDrop && !options.readOnly && !posEq(sel.from, sel.to) && + !posLess(start, sel.from) && !posLess(sel.to, start) && type == "single") { + // Let the drag handler handle this. + if (webkit) scroller.draggable = true; + function dragEnd(e2) { + if (webkit) scroller.draggable = false; + draggingText = false; + up(); drop(); + if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) { + e_preventDefault(e2); + setCursor(start.line, start.ch, true); + focusInput(); + } + } + var up = connect(document, "mouseup", operation(dragEnd), true); + var drop = connect(scroller, "drop", operation(dragEnd), true); + draggingText = true; + // IE's approach to draggable + if (scroller.dragDrop) scroller.dragDrop(); + return; + } + e_preventDefault(e); + if (type == "single") setCursor(start.line, start.ch, true); + + var startstart = sel.from, startend = sel.to; + + function doSelect(cur) { + if (type == "single") { + setSelectionUser(start, cur); + } else if (type == "double") { + var word = findWordAt(cur); + if (posLess(cur, startstart)) setSelectionUser(word.from, startend); + else setSelectionUser(startstart, word.to); + } else if (type == "triple") { + if (posLess(cur, startstart)) setSelectionUser(startend, clipPos({line: cur.line, ch: 0})); + else setSelectionUser(startstart, clipPos({line: cur.line + 1, ch: 0})); + } + } + + function extend(e) { + var cur = posFromMouse(e, true); + if (cur && !posEq(cur, last)) { + if (!focused) onFocus(); + last = cur; + doSelect(cur); + updateInput = false; + var visible = visibleLines(); + if (cur.line >= visible.to || cur.line < visible.from) + going = setTimeout(operation(function(){extend(e);}), 150); + } + } + + function done(e) { + clearTimeout(going); + var cur = posFromMouse(e); + if (cur) doSelect(cur); + e_preventDefault(e); + focusInput(); + updateInput = true; + move(); up(); + } + var move = connect(document, "mousemove", operation(function(e) { + clearTimeout(going); + e_preventDefault(e); + if (!ie && !e_button(e)) done(e); + else extend(e); + }), true); + var up = connect(document, "mouseup", operation(done), true); + } + function onDoubleClick(e) { + for (var n = e_target(e); n != wrapper; n = n.parentNode) + if (n.parentNode == gutterText) return e_preventDefault(e); + e_preventDefault(e); + } + function onDrop(e) { + if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return; + e.preventDefault(); + var pos = posFromMouse(e, true), files = e.dataTransfer.files; + if (!pos || options.readOnly) return; + if (files && files.length && window.FileReader && window.File) { + function loadFile(file, i) { + var reader = new FileReader; + reader.onload = function() { + text[i] = reader.result; + if (++read == n) { + pos = clipPos(pos); + operation(function() { + var end = replaceRange(text.join(""), pos, pos); + setSelectionUser(pos, end); + })(); + } + }; + reader.readAsText(file); + } + var n = files.length, text = Array(n), read = 0; + for (var i = 0; i < n; ++i) loadFile(files[i], i); + } else { + // Don't do a replace if the drop happened inside of the selected text. + if (draggingText && !(posLess(pos, sel.from) || posLess(sel.to, pos))) return; + try { + var text = e.dataTransfer.getData("Text"); + if (text) { + compoundChange(function() { + var curFrom = sel.from, curTo = sel.to; + setSelectionUser(pos, pos); + if (draggingText) replaceRange("", curFrom, curTo); + replaceSelection(text); + focusInput(); + }); + } + } + catch(e){} + } + } + function onDragStart(e) { + var txt = getSelection(); + e.dataTransfer.setData("Text", txt); + + // Use dummy image instead of default browsers image. + if (gecko || chrome || opera) { + var img = document.createElement('img'); + img.scr = 'data:image/gif;base64,R0lGODdhAgACAIAAAAAAAP///ywAAAAAAgACAAACAoRRADs='; //1x1 image + e.dataTransfer.setDragImage(img, 0, 0); + } + } + + function doHandleBinding(bound, dropShift) { + if (typeof bound == "string") { + bound = commands[bound]; + if (!bound) return false; + } + var prevShift = shiftSelecting; + try { + if (options.readOnly) suppressEdits = true; + if (dropShift) shiftSelecting = null; + bound(instance); + } catch(e) { + if (e != Pass) throw e; + return false; + } finally { + shiftSelecting = prevShift; + suppressEdits = false; + } + return true; + } + function handleKeyBinding(e) { + // Handle auto keymap transitions + var startMap = getKeyMap(options.keyMap), next = startMap.auto; + clearTimeout(maybeTransition); + if (next && !isModifierKey(e)) maybeTransition = setTimeout(function() { + if (getKeyMap(options.keyMap) == startMap) { + options.keyMap = (next.call ? next.call(null, instance) : next); + } + }, 50); + + var name = keyNames[e_prop(e, "keyCode")], handled = false; + if (name == null || e.altGraphKey) return false; + if (e_prop(e, "altKey")) name = "Alt-" + name; + if (e_prop(e, "ctrlKey")) name = "Ctrl-" + name; + if (e_prop(e, "metaKey")) name = "Cmd-" + name; + + var stopped = false; + function stop() { stopped = true; } + + if (e_prop(e, "shiftKey")) { + handled = lookupKey("Shift-" + name, options.extraKeys, options.keyMap, + function(b) {return doHandleBinding(b, true);}, stop) + || lookupKey(name, options.extraKeys, options.keyMap, function(b) { + if (typeof b == "string" && /^go[A-Z]/.test(b)) return doHandleBinding(b); + }, stop); + } else { + handled = lookupKey(name, options.extraKeys, options.keyMap, doHandleBinding, stop); + } + if (stopped) handled = false; + if (handled) { + e_preventDefault(e); + restartBlink(); + if (ie) { e.oldKeyCode = e.keyCode; e.keyCode = 0; } + } + return handled; + } + function handleCharBinding(e, ch) { + var handled = lookupKey("'" + ch + "'", options.extraKeys, + options.keyMap, function(b) { return doHandleBinding(b, true); }); + if (handled) { + e_preventDefault(e); + restartBlink(); + } + return handled; + } + + var lastStoppedKey = null, maybeTransition; + function onKeyDown(e) { + if (!focused) onFocus(); + if (ie && e.keyCode == 27) { e.returnValue = false; } + if (pollingFast) { if (readInput()) pollingFast = false; } + if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return; + var code = e_prop(e, "keyCode"); + // IE does strange things with escape. + setShift(code == 16 || e_prop(e, "shiftKey")); + // First give onKeyEvent option a chance to handle this. + var handled = handleKeyBinding(e); + if (opera) { + lastStoppedKey = handled ? code : null; + // Opera has no cut event... we try to at least catch the key combo + if (!handled && code == 88 && e_prop(e, mac ? "metaKey" : "ctrlKey")) + replaceSelection(""); + } + } + function onKeyPress(e) { + if (pollingFast) readInput(); + if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return; + var keyCode = e_prop(e, "keyCode"), charCode = e_prop(e, "charCode"); + if (opera && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return;} + if (((opera && (!e.which || e.which < 10)) || khtml) && handleKeyBinding(e)) return; + var ch = String.fromCharCode(charCode == null ? keyCode : charCode); + if (options.electricChars && mode.electricChars && options.smartIndent && !options.readOnly) { + if (mode.electricChars.indexOf(ch) > -1) + setTimeout(operation(function() {indentLine(sel.to.line, "smart");}), 75); + } + if (handleCharBinding(e, ch)) return; + fastPoll(); + } + function onKeyUp(e) { + if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return; + if (e_prop(e, "keyCode") == 16) shiftSelecting = null; + } + + function onFocus() { + if (options.readOnly == "nocursor") return; + if (!focused) { + if (options.onFocus) options.onFocus(instance); + focused = true; + if (scroller.className.search(/\bCodeMirror-focused\b/) == -1) + scroller.className += " CodeMirror-focused"; + if (!leaveInputAlone) resetInput(true); + } + slowPoll(); + restartBlink(); + } + function onBlur() { + if (focused) { + if (options.onBlur) options.onBlur(instance); + focused = false; + if (bracketHighlighted) + operation(function(){ + if (bracketHighlighted) { bracketHighlighted(); bracketHighlighted = null; } + })(); + scroller.className = scroller.className.replace(" CodeMirror-focused", ""); + } + clearInterval(blinker); + setTimeout(function() {if (!focused) shiftSelecting = null;}, 150); + } + + function chopDelta(delta) { + // Make sure we always scroll a little bit for any nonzero delta. + if (delta > 0.0 && delta < 1.0) return 1; + else if (delta > -1.0 && delta < 0.0) return -1; + else return Math.round(delta); + } + + function onMouseWheel(e) { + var deltaX = 0, deltaY = 0; + if (e.type == "DOMMouseScroll") { // Firefox + var delta = -e.detail * 8.0; + if (e.axis == e.HORIZONTAL_AXIS) deltaX = delta; + else if (e.axis == e.VERTICAL_AXIS) deltaY = delta; + } else if (e.wheelDeltaX !== undefined && e.wheelDeltaY !== undefined) { // WebKit + deltaX = e.wheelDeltaX / 3.0; + deltaY = e.wheelDeltaY / 3.0; + } else if (e.wheelDelta !== undefined) { // IE or Opera + deltaY = e.wheelDelta / 3.0; + } + + var scrolled = false; + deltaX = chopDelta(deltaX); + deltaY = chopDelta(deltaY); + if ((deltaX > 0 && scroller.scrollLeft > 0) || + (deltaX < 0 && scroller.scrollLeft + scroller.clientWidth < scroller.scrollWidth)) { + scroller.scrollLeft -= deltaX; + scrolled = true; + } + if ((deltaY > 0 && scrollbar.scrollTop > 0) || + (deltaY < 0 && scrollbar.scrollTop + scrollbar.clientHeight < scrollbar.scrollHeight)) { + scrollbar.scrollTop -= deltaY; + scrolled = true; + } + if (scrolled) e_stop(e); + } + + // Replace the range from from to to by the strings in newText. + // Afterwards, set the selection to selFrom, selTo. + function updateLines(from, to, newText, selFrom, selTo) { + if (suppressEdits) return; + if (history) { + var old = []; + doc.iter(from.line, to.line + 1, function(line) { old.push(line.text); }); + history.addChange(from.line, newText.length, old); + while (history.done.length > options.undoDepth) history.done.shift(); + } + updateLinesNoUndo(from, to, newText, selFrom, selTo); + } + function unredoHelper(from, to) { + if (!from.length) return; + var set = from.pop(), out = []; + for (var i = set.length - 1; i >= 0; i -= 1) { + var change = set[i]; + var replaced = [], end = change.start + change.added; + doc.iter(change.start, end, function(line) { replaced.push(line.text); }); + out.push({start: change.start, added: change.old.length, old: replaced}); + var pos = {line: change.start + change.old.length - 1, + ch: editEnd(replaced[replaced.length-1], change.old[change.old.length-1])}; + updateLinesNoUndo({line: change.start, ch: 0}, {line: end - 1, ch: getLine(end-1).text.length}, change.old, pos, pos); + } + updateInput = true; + to.push(out); + } + function undo() {unredoHelper(history.done, history.undone);} + function redo() {unredoHelper(history.undone, history.done);} + + function updateLinesNoUndo(from, to, newText, selFrom, selTo) { + if (suppressEdits) return; + var recomputeMaxLength = false, maxLineLength = maxLine.length; + if (!options.lineWrapping) + doc.iter(from.line, to.line + 1, function(line) { + if (!line.hidden && line.text.length == maxLineLength) {recomputeMaxLength = true; return true;} + }); + if (from.line != to.line || newText.length > 1) gutterDirty = true; + + var nlines = to.line - from.line, firstLine = getLine(from.line), lastLine = getLine(to.line); + // First adjust the line structure, taking some care to leave highlighting intact. + if (from.ch == 0 && to.ch == 0 && newText[newText.length - 1] == "") { + // This is a whole-line replace. Treated specially to make + // sure line objects move the way they are supposed to. + var added = [], prevLine = null; + if (from.line) { + prevLine = getLine(from.line - 1); + prevLine.fixMarkEnds(lastLine); + } else lastLine.fixMarkStarts(); + for (var i = 0, e = newText.length - 1; i < e; ++i) + added.push(Line.inheritMarks(newText[i], prevLine)); + if (nlines) doc.remove(from.line, nlines, callbacks); + if (added.length) doc.insert(from.line, added); + } else if (firstLine == lastLine) { + if (newText.length == 1) + firstLine.replace(from.ch, to.ch, newText[0]); + else { + lastLine = firstLine.split(to.ch, newText[newText.length-1]); + firstLine.replace(from.ch, null, newText[0]); + firstLine.fixMarkEnds(lastLine); + var added = []; + for (var i = 1, e = newText.length - 1; i < e; ++i) + added.push(Line.inheritMarks(newText[i], firstLine)); + added.push(lastLine); + doc.insert(from.line + 1, added); + } + } else if (newText.length == 1) { + firstLine.replace(from.ch, null, newText[0]); + lastLine.replace(null, to.ch, ""); + firstLine.append(lastLine); + doc.remove(from.line + 1, nlines, callbacks); + } else { + var added = []; + firstLine.replace(from.ch, null, newText[0]); + lastLine.replace(null, to.ch, newText[newText.length-1]); + firstLine.fixMarkEnds(lastLine); + for (var i = 1, e = newText.length - 1; i < e; ++i) + added.push(Line.inheritMarks(newText[i], firstLine)); + if (nlines > 1) doc.remove(from.line + 1, nlines - 1, callbacks); + doc.insert(from.line + 1, added); + } + if (options.lineWrapping) { + var perLine = Math.max(5, scroller.clientWidth / charWidth() - 3); + doc.iter(from.line, from.line + newText.length, function(line) { + if (line.hidden) return; + var guess = Math.ceil(line.text.length / perLine) || 1; + if (guess != line.height) updateLineHeight(line, guess); + }); + } else { + doc.iter(from.line, from.line + newText.length, function(line) { + var l = line.text; + if (!line.hidden && l.length > maxLineLength) { + maxLine = l; maxLineLength = l.length; maxLineChanged = true; + recomputeMaxLength = false; + } + }); + if (recomputeMaxLength) updateMaxLine = true; + } + + // Add these lines to the work array, so that they will be + // highlighted. Adjust work lines if lines were added/removed. + var newWork = [], lendiff = newText.length - nlines - 1; + for (var i = 0, l = work.length; i < l; ++i) { + var task = work[i]; + if (task < from.line) newWork.push(task); + else if (task > to.line) newWork.push(task + lendiff); + } + var hlEnd = from.line + Math.min(newText.length, 500); + highlightLines(from.line, hlEnd); + newWork.push(hlEnd); + work = newWork; + startWorker(100); + // Remember that these lines changed, for updating the display + changes.push({from: from.line, to: to.line + 1, diff: lendiff}); + var changeObj = {from: from, to: to, text: newText}; + if (textChanged) { + for (var cur = textChanged; cur.next; cur = cur.next) {} + cur.next = changeObj; + } else textChanged = changeObj; + + // Update the selection + function updateLine(n) {return n <= Math.min(to.line, to.line + lendiff) ? n : n + lendiff;} + setSelection(clipPos(selFrom), clipPos(selTo), + updateLine(sel.from.line), updateLine(sel.to.line)); + } + + function needsScrollbar() { + var realHeight = doc.height * textHeight() + 2 * paddingTop(); + return realHeight - 1 > scroller.offsetHeight ? realHeight : false; + } + + function updateVerticalScroll(scrollTop) { + var scrollHeight = needsScrollbar(); + scrollbar.style.display = scrollHeight ? "block" : "none"; + if (scrollHeight) { + scrollbarInner.style.height = scrollHeight + "px"; + scrollbar.style.height = scroller.offsetHeight + "px"; + if (scrollTop != null) scrollbar.scrollTop = scrollTop; + } + // Position the mover div to align with the current virtual scroll position + mover.style.top = (displayOffset * textHeight() - scrollbar.scrollTop) + "px"; + } + + // On Mac OS X Lion and up, detect whether the mouse is plugged in by measuring + // the width of a div with a scrollbar in it. If the width is <= 1, then + // the mouse isn't plugged in and scrollbars should overlap the content. + function overlapScrollbars() { + var tmpSb = document.createElement('div'), + tmpSbInner = document.createElement('div'); + tmpSb.className = "CodeMirror-scrollbar"; + tmpSb.style.cssText = "position: absolute; left: -9999px; height: 100px;"; + tmpSbInner.className = "CodeMirror-scrollbar-inner"; + tmpSbInner.style.height = "200px"; + tmpSb.appendChild(tmpSbInner); + + document.body.appendChild(tmpSb); + var result = (tmpSb.offsetWidth <= 1); + document.body.removeChild(tmpSb); + return result; + } + + function computeMaxLength() { + var maxLineLength = 0; + maxLine = ""; maxLineChanged = true; + doc.iter(0, doc.size, function(line) { + var l = line.text; + if (!line.hidden && l.length > maxLineLength) { + maxLineLength = l.length; maxLine = l; + } + }); + updateMaxLine = false; + } + + function replaceRange(code, from, to) { + from = clipPos(from); + if (!to) to = from; else to = clipPos(to); + code = splitLines(code); + function adjustPos(pos) { + if (posLess(pos, from)) return pos; + if (!posLess(to, pos)) return end; + var line = pos.line + code.length - (to.line - from.line) - 1; + var ch = pos.ch; + if (pos.line == to.line) + ch += code[code.length-1].length - (to.ch - (to.line == from.line ? from.ch : 0)); + return {line: line, ch: ch}; + } + var end; + replaceRange1(code, from, to, function(end1) { + end = end1; + return {from: adjustPos(sel.from), to: adjustPos(sel.to)}; + }); + return end; + } + function replaceSelection(code, collapse) { + replaceRange1(splitLines(code), sel.from, sel.to, function(end) { + if (collapse == "end") return {from: end, to: end}; + else if (collapse == "start") return {from: sel.from, to: sel.from}; + else return {from: sel.from, to: end}; + }); + } + function replaceRange1(code, from, to, computeSel) { + var endch = code.length == 1 ? code[0].length + from.ch : code[code.length-1].length; + var newSel = computeSel({line: from.line + code.length - 1, ch: endch}); + updateLines(from, to, code, newSel.from, newSel.to); + } + + function getRange(from, to, lineSep) { + var l1 = from.line, l2 = to.line; + if (l1 == l2) return getLine(l1).text.slice(from.ch, to.ch); + var code = [getLine(l1).text.slice(from.ch)]; + doc.iter(l1 + 1, l2, function(line) { code.push(line.text); }); + code.push(getLine(l2).text.slice(0, to.ch)); + return code.join(lineSep || "\n"); + } + function getSelection(lineSep) { + return getRange(sel.from, sel.to, lineSep); + } + + var pollingFast = false; // Ensures slowPoll doesn't cancel fastPoll + function slowPoll() { + if (pollingFast) return; + poll.set(options.pollInterval, function() { + startOperation(); + readInput(); + if (focused) slowPoll(); + endOperation(); + }); + } + function fastPoll() { + var missed = false; + pollingFast = true; + function p() { + startOperation(); + var changed = readInput(); + if (!changed && !missed) {missed = true; poll.set(60, p);} + else {pollingFast = false; slowPoll();} + endOperation(); + } + poll.set(20, p); + } + + // Previnput is a hack to work with IME. If we reset the textarea + // on every change, that breaks IME. So we look for changes + // compared to the previous content instead. (Modern browsers have + // events that indicate IME taking place, but these are not widely + // supported or compatible enough yet to rely on.) + var prevInput = ""; + function readInput() { + if (leaveInputAlone || !focused || hasSelection(input) || options.readOnly) return false; + var text = input.value; + if (text == prevInput) return false; + shiftSelecting = null; + var same = 0, l = Math.min(prevInput.length, text.length); + while (same < l && prevInput[same] == text[same]) ++same; + if (same < prevInput.length) + sel.from = {line: sel.from.line, ch: sel.from.ch - (prevInput.length - same)}; + else if (overwrite && posEq(sel.from, sel.to)) + sel.to = {line: sel.to.line, ch: Math.min(getLine(sel.to.line).text.length, sel.to.ch + (text.length - same))}; + replaceSelection(text.slice(same), "end"); + if (text.length > 1000) { input.value = prevInput = ""; } + else prevInput = text; + return true; + } + function resetInput(user) { + if (!posEq(sel.from, sel.to)) { + prevInput = ""; + input.value = getSelection(); + selectInput(input); + } else if (user) prevInput = input.value = ""; + } + + function focusInput() { + if (options.readOnly != "nocursor") input.focus(); + } + + function scrollEditorIntoView() { + var rect = cursor.getBoundingClientRect(); + // IE returns bogus coordinates when the instance sits inside of an iframe and the cursor is hidden + if (ie && rect.top == rect.bottom) return; + var winH = window.innerHeight || Math.max(document.body.offsetHeight, document.documentElement.offsetHeight); + if (rect.top < 0 || rect.bottom > winH) scrollCursorIntoView(); + } + function scrollCursorIntoView() { + var coords = calculateCursorCoords(); + return scrollIntoView(coords.x, coords.y, coords.x, coords.yBot); + } + function calculateCursorCoords() { + var cursor = localCoords(sel.inverted ? sel.from : sel.to); + var x = options.lineWrapping ? Math.min(cursor.x, lineSpace.offsetWidth) : cursor.x; + return {x: x, y: cursor.y, yBot: cursor.yBot}; + } + function scrollIntoView(x1, y1, x2, y2) { + var scrollPos = calculateScrollPos(x1, y1, x2, y2), scrolled = false; + if (scrollPos.scrollLeft != null) {scroller.scrollLeft = scrollPos.scrollLeft; scrolled = true;} + if (scrollPos.scrollTop != null) {scrollbar.scrollTop = scrollPos.scrollTop; scrolled = true;} + if (scrolled && options.onScroll) options.onScroll(instance); + } + function calculateScrollPos(x1, y1, x2, y2) { + var pl = paddingLeft(), pt = paddingTop(); + y1 += pt; y2 += pt; x1 += pl; x2 += pl; + var screen = scroller.clientHeight, screentop = scrollbar.scrollTop, result = {}; + var docBottom = scroller.scrollHeight; + var atTop = y1 < pt + 10, atBottom = y2 + pt > docBottom - 10;; + if (y1 < screentop) result.scrollTop = atTop ? 0 : Math.max(0, y1); + else if (y2 > screentop + screen) result.scrollTop = (atBottom ? docBottom : y2) - screen; + + var screenw = scroller.clientWidth, screenleft = scroller.scrollLeft; + var gutterw = options.fixedGutter ? gutter.clientWidth : 0; + var atLeft = x1 < gutterw + pl + 10; + if (x1 < screenleft + gutterw || atLeft) { + if (atLeft) x1 = 0; + result.scrollLeft = Math.max(0, x1 - 10 - gutterw); + } else if (x2 > screenw + screenleft - 3) { + result.scrollLeft = x2 + 10 - screenw; + } + return result; + } + + function visibleLines(scrollTop) { + var lh = textHeight(), top = (scrollTop != null ? scrollTop : scrollbar.scrollTop) - paddingTop(); + var fromHeight = Math.max(0, Math.floor(top / lh)); + var toHeight = Math.ceil((top + scroller.clientHeight) / lh); + return {from: lineAtHeight(doc, fromHeight), + to: lineAtHeight(doc, toHeight)}; + } + // Uses a set of changes plus the current scroll position to + // determine which DOM updates have to be made, and makes the + // updates. + function updateDisplay(changes, suppressCallback, scrollTop) { + if (!scroller.clientWidth) { + showingFrom = showingTo = displayOffset = 0; + return; + } + // Compute the new visible window + // If scrollTop is specified, use that to determine which lines + // to render instead of the current scrollbar position. + var visible = visibleLines(scrollTop); + // Bail out if the visible area is already rendered and nothing changed. + if (changes !== true && changes.length == 0 && visible.from > showingFrom && visible.to < showingTo) { + updateVerticalScroll(scrollTop); + return; + } + var from = Math.max(visible.from - 100, 0), to = Math.min(doc.size, visible.to + 100); + if (showingFrom < from && from - showingFrom < 20) from = showingFrom; + if (showingTo > to && showingTo - to < 20) to = Math.min(doc.size, showingTo); + + // Create a range of theoretically intact lines, and punch holes + // in that using the change info. + var intact = changes === true ? [] : + computeIntact([{from: showingFrom, to: showingTo, domStart: 0}], changes); + // Clip off the parts that won't be visible + var intactLines = 0; + for (var i = 0; i < intact.length; ++i) { + var range = intact[i]; + if (range.from < from) {range.domStart += (from - range.from); range.from = from;} + if (range.to > to) range.to = to; + if (range.from >= range.to) intact.splice(i--, 1); + else intactLines += range.to - range.from; + } + if (intactLines == to - from && from == showingFrom && to == showingTo) { + updateVerticalScroll(scrollTop); + return; + } + intact.sort(function(a, b) {return a.domStart - b.domStart;}); + + var th = textHeight(), gutterDisplay = gutter.style.display; + lineDiv.style.display = "none"; + patchDisplay(from, to, intact); + lineDiv.style.display = gutter.style.display = ""; + + var different = from != showingFrom || to != showingTo || lastSizeC != scroller.clientHeight + th; + // This is just a bogus formula that detects when the editor is + // resized or the font size changes. + if (different) lastSizeC = scroller.clientHeight + th; + showingFrom = from; showingTo = to; + displayOffset = heightAtLine(doc, from); + + // Since this is all rather error prone, it is honoured with the + // only assertion in the whole file. + if (lineDiv.childNodes.length != showingTo - showingFrom) + throw new Error("BAD PATCH! " + JSON.stringify(intact) + " size=" + (showingTo - showingFrom) + + " nodes=" + lineDiv.childNodes.length); + + function checkHeights() { + var curNode = lineDiv.firstChild, heightChanged = false; + doc.iter(showingFrom, showingTo, function(line) { + if (!line.hidden) { + var height = Math.round(curNode.offsetHeight / th) || 1; + if (line.height != height) { + updateLineHeight(line, height); + gutterDirty = heightChanged = true; + } + } + curNode = curNode.nextSibling; + }); + return heightChanged; + } + + if (options.lineWrapping) { + checkHeights(); + var scrollHeight = needsScrollbar(); + var shouldHaveScrollbar = scrollHeight ? "block" : "none"; + if (scrollbar.style.display != shouldHaveScrollbar) { + scrollbar.style.display = shouldHaveScrollbar; + if (scrollHeight) scrollbarInner.style.height = scrollHeight + "px"; + checkHeights(); + } + } + + gutter.style.display = gutterDisplay; + if (different || gutterDirty) { + // If the gutter grew in size, re-check heights. If those changed, re-draw gutter. + updateGutter() && options.lineWrapping && checkHeights() && updateGutter(); + } + updateVerticalScroll(scrollTop); + updateSelection(); + if (!suppressCallback && options.onUpdate) options.onUpdate(instance); + return true; + } + + function computeIntact(intact, changes) { + for (var i = 0, l = changes.length || 0; i < l; ++i) { + var change = changes[i], intact2 = [], diff = change.diff || 0; + for (var j = 0, l2 = intact.length; j < l2; ++j) { + var range = intact[j]; + if (change.to <= range.from && change.diff) + intact2.push({from: range.from + diff, to: range.to + diff, + domStart: range.domStart}); + else if (change.to <= range.from || change.from >= range.to) + intact2.push(range); + else { + if (change.from > range.from) + intact2.push({from: range.from, to: change.from, domStart: range.domStart}); + if (change.to < range.to) + intact2.push({from: change.to + diff, to: range.to + diff, + domStart: range.domStart + (change.to - range.from)}); + } + } + intact = intact2; + } + return intact; + } + + function patchDisplay(from, to, intact) { + // The first pass removes the DOM nodes that aren't intact. + if (!intact.length) lineDiv.innerHTML = ""; + else { + function killNode(node) { + var tmp = node.nextSibling; + node.parentNode.removeChild(node); + return tmp; + } + var domPos = 0, curNode = lineDiv.firstChild, n; + for (var i = 0; i < intact.length; ++i) { + var cur = intact[i]; + while (cur.domStart > domPos) {curNode = killNode(curNode); domPos++;} + for (var j = 0, e = cur.to - cur.from; j < e; ++j) {curNode = curNode.nextSibling; domPos++;} + } + while (curNode) curNode = killNode(curNode); + } + // This pass fills in the lines that actually changed. + var nextIntact = intact.shift(), curNode = lineDiv.firstChild, j = from; + var scratch = document.createElement("div"); + doc.iter(from, to, function(line) { + if (nextIntact && nextIntact.to == j) nextIntact = intact.shift(); + if (!nextIntact || nextIntact.from > j) { + if (line.hidden) var html = scratch.innerHTML = "
";
+          else {
+            var html = ''
+              + line.getHTML(makeTab) + '';
+            // Kludge to make sure the styled element lies behind the selection (by z-index)
+            if (line.bgClassName)
+              html = '
 
' + html + "
";
+          }
+          scratch.innerHTML = html;
+          lineDiv.insertBefore(scratch.firstChild, curNode);
+        } else {
+          curNode = curNode.nextSibling;
+        }
+        ++j;
+      });
+    }
+
+    function updateGutter() {
+      if (!options.gutter && !options.lineNumbers) return;
+      var hText = mover.offsetHeight, hEditor = scroller.clientHeight;
+      gutter.style.height = (hText - hEditor < 2 ? hEditor : hText) + "px";
+      var html = [], i = showingFrom, normalNode;
+      doc.iter(showingFrom, Math.max(showingTo, showingFrom + 1), function(line) {
+        if (line.hidden) {
+          html.push("
");
+        } else {
+          var marker = line.gutterMarker;
+          var text = options.lineNumbers ? options.lineNumberFormatter(i + options.firstLineNumber) : null;
+          if (marker && marker.text)
+            text = marker.text.replace("%N%", text != null ? text : "");
+          else if (text == null)
+            text = "\u00a0";
+          html.push((marker && marker.style ? '
' : "
"), text);
+          for (var j = 1; j < line.height; ++j) html.push("
 ");
+          html.push("
");
+          if (!marker) normalNode = i;
+        }
+        ++i;
+      });
+      gutter.style.display = "none";
+      gutterText.innerHTML = html.join("");
+      // Make sure scrolling doesn't cause number gutter size to pop
+      if (normalNode != null && options.lineNumbers) {
+        var node = gutterText.childNodes[normalNode - showingFrom];
+        var minwidth = String(doc.size).length, val = eltText(node.firstChild), pad = "";
+        while (val.length + pad.length < minwidth) pad += "\u00a0";
+        if (pad) node.insertBefore(document.createTextNode(pad), node.firstChild);
+      }
+      gutter.style.display = "";
+      var resized = Math.abs((parseInt(lineSpace.style.marginLeft) || 0) - gutter.offsetWidth) > 2;
+      lineSpace.style.marginLeft = gutter.offsetWidth + "px";
+      gutterDirty = false;
+      return resized;
+    }
+    function updateSelection() {
+      var collapsed = posEq(sel.from, sel.to);
+      var fromPos = localCoords(sel.from, true);
+      var toPos = collapsed ? fromPos : localCoords(sel.to, true);
+      var headPos = sel.inverted ? fromPos : toPos, th = textHeight();
+      var wrapOff = eltOffset(wrapper), lineOff = eltOffset(lineDiv);
+      inputDiv.style.top = Math.max(0, Math.min(scroller.offsetHeight, headPos.y + lineOff.top - wrapOff.top)) + "px";
+      inputDiv.style.left = Math.max(0, Math.min(scroller.offsetWidth, headPos.x + lineOff.left - wrapOff.left)) + "px";
+      if (collapsed) {
+        cursor.style.top = headPos.y + "px";
+        cursor.style.left = (options.lineWrapping ? Math.min(headPos.x, lineSpace.offsetWidth) : headPos.x) + "px";
+        cursor.style.display = "";
+        selectionDiv.style.display = "none";
+      } else {
+        var sameLine = fromPos.y == toPos.y, html = "";
+        var clientWidth = lineSpace.clientWidth || lineSpace.offsetWidth;
+        var clientHeight = lineSpace.clientHeight || lineSpace.offsetHeight;
+        function add(left, top, right, height) {
+          var rstyle = quirksMode ? "width: " + (!right ? clientWidth : clientWidth - right - left) + "px"
+                                  : "right: " + right + "px";
+          html += '
';
+        }
+        if (sel.from.ch && fromPos.y >= 0) {
+          var right = sameLine ? clientWidth - toPos.x : 0;
+          add(fromPos.x, fromPos.y, right, th);
+        }
+        var middleStart = Math.max(0, fromPos.y + (sel.from.ch ? th : 0));
+        var middleHeight = Math.min(toPos.y, clientHeight) - middleStart;
+        if (middleHeight > 0.2 * th)
+          add(0, middleStart, 0, middleHeight);
+        if ((!sameLine || !sel.from.ch) && toPos.y < clientHeight - .5 * th)
+          add(0, toPos.y, clientWidth - toPos.x, th);
+        selectionDiv.innerHTML = html;
+        cursor.style.display = "none";
+        selectionDiv.style.display = "";
+      }
+    }
+
+    function setShift(val) {
+      if (val) shiftSelecting = shiftSelecting || (sel.inverted ? sel.to : sel.from);
+      else shiftSelecting = null;
+    }
+    function setSelectionUser(from, to) {
+      var sh = shiftSelecting && clipPos(shiftSelecting);
+      if (sh) {
+        if (posLess(sh, from)) from = sh;
+        else if (posLess(to, sh)) to = sh;
+      }
+      setSelection(from, to);
+      userSelChange = true;
+    }
+    // Update the selection. Last two args are only used by
+    // updateLines, since they have to be expressed in the line
+    // numbers before the update.
+    function setSelection(from, to, oldFrom, oldTo) {
+      goalColumn = null;
+      if (oldFrom == null) {oldFrom = sel.from.line; oldTo = sel.to.line;}
+      if (posEq(sel.from, from) && posEq(sel.to, to)) return;
+      if (posLess(to, from)) {var tmp = to; to = from; from = tmp;}
+
+      // Skip over hidden lines.
+      if (from.line != oldFrom) {
+        var from1 = skipHidden(from, oldFrom, sel.from.ch);
+        // If there is no non-hidden line left, force visibility on current line
+        if (!from1) setLineHidden(from.line, false);
+        else from = from1;
+      }
+      if (to.line != oldTo) to = skipHidden(to, oldTo, sel.to.ch);
+
+      if (posEq(from, to)) sel.inverted = false;
+      else if (posEq(from, sel.to)) sel.inverted = false;
+      else if (posEq(to, sel.from)) sel.inverted = true;
+
+      if (options.autoClearEmptyLines && posEq(sel.from, sel.to)) {
+        var head = sel.inverted ? from : to;
+        if (head.line != sel.from.line && sel.from.line < doc.size) {
+          var oldLine = getLine(sel.from.line);
+          if (/^\s+$/.test(oldLine.text))
+            setTimeout(operation(function() {
+              if (oldLine.parent && /^\s+$/.test(oldLine.text)) {
+                var no = lineNo(oldLine);
+                replaceRange("", {line: no, ch: 0}, {line: no, ch: oldLine.text.length});
+              }
+            }, 10));
+        }
+      }
+
+      sel.from = from; sel.to = to;
+      selectionChanged = true;
+    }
+    function skipHidden(pos, oldLine, oldCh) {
+      function getNonHidden(dir) {
+        var lNo = pos.line + dir, end = dir == 1 ? doc.size : -1;
+        while (lNo != end) {
+          var line = getLine(lNo);
+          if (!line.hidden) {
+            var ch = pos.ch;
+            if (toEnd || ch > oldCh || ch > line.text.length) ch = line.text.length;
+            return {line: lNo, ch: ch};
+          }
+          lNo += dir;
+        }
+      }
+      var line = getLine(pos.line);
+      var toEnd = pos.ch == line.text.length && pos.ch != oldCh;
+      if (!line.hidden) return pos;
+      if (pos.line >= oldLine) return getNonHidden(1) || getNonHidden(-1);
+      else return getNonHidden(-1) || getNonHidden(1);
+    }
+    function setCursor(line, ch, user) {
+      var pos = clipPos({line: line, ch: ch || 0});
+      (user ? setSelectionUser : setSelection)(pos, pos);
+    }
+
+    function clipLine(n) {return Math.max(0, Math.min(n, doc.size-1));}
+    function clipPos(pos) {
+      if (pos.line < 0) return {line: 0, ch: 0};
+      if (pos.line >= doc.size) return {line: doc.size-1, ch: getLine(doc.size-1).text.length};
+      var ch = pos.ch, linelen = getLine(pos.line).text.length;
+      if (ch == null || ch > linelen) return {line: pos.line, ch: linelen};
+      else if (ch < 0) return {line: pos.line, ch: 0};
+      else return pos;
+    }
+
+    function findPosH(dir, unit) {
+      var end = sel.inverted ? sel.from : sel.to, line = end.line, ch = end.ch;
+      var lineObj = getLine(line);
+      function findNextLine() {
+        for (var l = line + dir, e = dir < 0 ? -1 : doc.size; l != e; l += dir) {
+          var lo = getLine(l);
+          if (!lo.hidden) { line = l; lineObj = lo; return true; }
+        }
+      }
+      function moveOnce(boundToLine) {
+        if (ch == (dir < 0 ? 0 : lineObj.text.length)) {
+          if (!boundToLine && findNextLine()) ch = dir < 0 ? lineObj.text.length : 0;
+          else return false;
+        } else ch += dir;
+        return true;
+      }
+      if (unit == "char") moveOnce();
+      else if (unit == "column") moveOnce(true);
+      else if (unit == "word") {
+        var sawWord = false;
+        for (;;) {
+          if (dir < 0) if (!moveOnce()) break;
+          if (isWordChar(lineObj.text.charAt(ch))) sawWord = true;
+          else if (sawWord) {if (dir < 0) {dir = 1; moveOnce();} break;}
+          if (dir > 0) if (!moveOnce()) break;
+        }
+      }
+      return {line: line, ch: ch};
+    }
+    function moveH(dir, unit) {
+      var pos = dir < 0 ? sel.from : sel.to;
+      if (shiftSelecting || posEq(sel.from, sel.to)) pos = findPosH(dir, unit);
+      setCursor(pos.line, pos.ch, true);
+    }
+    function deleteH(dir, unit) {
+      if (!posEq(sel.from, sel.to)) replaceRange("", sel.from, sel.to);
+      else if (dir < 0) replaceRange("", findPosH(dir, unit), sel.to);
+      else replaceRange("", sel.from, findPosH(dir, unit));
+      userSelChange = true;
+    }
+    var goalColumn = null;
+    function moveV(dir, unit) {
+      var dist = 0, pos = localCoords(sel.inverted ? sel.from : sel.to, true);
+      if (goalColumn != null) pos.x = goalColumn;
+      if (unit == "page") dist = Math.min(scroller.clientHeight, window.innerHeight || document.documentElement.clientHeight);
+      else if (unit == "line") dist = textHeight();
+      var target = coordsChar(pos.x, pos.y + dist * dir + 2);
+      if (unit == "page") scrollbar.scrollTop += localCoords(target, true).y - pos.y;
+      setCursor(target.line, target.ch, true);
+      goalColumn = pos.x;
+    }
+
+    function findWordAt(pos) {
+      var line = getLine(pos.line).text;
+      var start = pos.ch, end = pos.ch;
+      var check = isWordChar(line.charAt(start < line.length ? start : start - 1)) ?
+        isWordChar : function(ch) {return !isWordChar(ch);};
+      while (start > 0 && check(line.charAt(start - 1))) --start;
+      while (end < line.length && check(line.charAt(end))) ++end;
+      return {from: {line: pos.line, ch: start}, to: {line: pos.line, ch: end}};
+    }
+    function selectLine(line) {
+      setSelectionUser({line: line, ch: 0}, clipPos({line: line + 1, ch: 0}));
+    }
+    function indentSelected(mode) {
+      if (posEq(sel.from, sel.to)) return indentLine(sel.from.line, mode);
+      var e = sel.to.line - (sel.to.ch ? 0 : 1);
+      for (var i = sel.from.line; i <= e; ++i) indentLine(i, mode);
+    }
+
+    function indentLine(n, how) {
+      if (!how) how = "add";
+      if (how == "smart") {
+        if (!mode.indent) how = "prev";
+        else var state = getStateBefore(n);
+      }
+
+      var line = getLine(n), curSpace = line.indentation(options.tabSize),
+          curSpaceString = line.text.match(/^\s*/)[0], indentation;
+      if (how == "smart") {
+        indentation = mode.indent(state, line.text.slice(curSpaceString.length), line.text);
+        if (indentation == Pass) how = "prev";
+      }
+      if (how == "prev") {
+        if (n) indentation = getLine(n-1).indentation(options.tabSize);
+        else indentation = 0;
+      }
+      else if (how == "add") indentation = curSpace + options.indentUnit;
+      else if (how == "subtract") indentation = curSpace - options.indentUnit;
+      indentation = Math.max(0, indentation);
+      var diff = indentation - curSpace;
+
+      var indentString = "", pos = 0;
+      if (options.indentWithTabs)
+        for (var i = Math.floor(indentation / options.tabSize); i; --i) {pos += options.tabSize; indentString += "\t";}
+      while (pos < indentation) {++pos; indentString += " ";}
+
+      replaceRange(indentString, {line: n, ch: 0}, {line: n, ch: curSpaceString.length});
+    }
+
+    function loadMode() {
+      mode = CodeMirror.getMode(options, options.mode);
+      doc.iter(0, doc.size, function(line) { line.stateAfter = null; });
+      work = [0];
+      startWorker();
+    }
+    function gutterChanged() {
+      var visible = options.gutter || options.lineNumbers;
+      gutter.style.display = visible ? "" : "none";
+      if (visible) gutterDirty = true;
+      else lineDiv.parentNode.style.marginLeft = 0;
+    }
+    function wrappingChanged(from, to) {
+      if (options.lineWrapping) {
+        wrapper.className += " CodeMirror-wrap";
+        var perLine = scroller.clientWidth / charWidth() - 3;
+        doc.iter(0, doc.size, function(line) {
+          if (line.hidden) return;
+          var guess = Math.ceil(line.text.length / perLine) || 1;
+          if (guess != 1) updateLineHeight(line, guess);
+        });
+        lineSpace.style.width = code.style.width = "";
+        widthForcer.style.left = "";
+      } else {
+        wrapper.className = wrapper.className.replace(" CodeMirror-wrap", "");
+        maxLine = ""; maxLineChanged = true;
+        doc.iter(0, doc.size, function(line) {
+          if (line.height != 1 && !line.hidden) updateLineHeight(line, 1);
+          if (line.text.length > maxLine.length) maxLine = line.text;
+        });
+      }
+      changes.push({from: 0, to: doc.size});
+    }
+    function makeTab(col) {
+      var w = options.tabSize - col % options.tabSize, cached = tabCache[w];
+      if (cached) return cached;
+      for (var str = '', i = 0; i < w; ++i) str += " ";
+      return (tabCache[w] = {html: str + "", width: w});
+    }
+    function themeChanged() {
+      scroller.className = scroller.className.replace(/\s*cm-s-\S+/g, "") +
+        options.theme.replace(/(^|\s)\s*/g, " cm-s-");
+    }
+    function keyMapChanged() {
+      var style = keyMap[options.keyMap].style;
+      wrapper.className = wrapper.className.replace(/\s*cm-keymap-\S+/g, "") +
+        (style ? " cm-keymap-" + style : "");
+    }
+
+    function TextMarker() { this.set = []; }
+    TextMarker.prototype.clear = operation(function() {
+      var min = Infinity, max = -Infinity;
+      for (var i = 0, e = this.set.length; i < e; ++i) {
+        var line = this.set[i], mk = line.marked;
+        if (!mk || !line.parent) continue;
+        var lineN = lineNo(line);
+        min = Math.min(min, lineN); max = Math.max(max, lineN);
+        for (var j = 0; j < mk.length; ++j)
+          if (mk[j].marker == this) mk.splice(j--, 1);
+      }
+      if (min != Infinity)
+        changes.push({from: min, to: max + 1});
+    });
+    TextMarker.prototype.find = function() {
+      var from, to;
+      for (var i = 0, e = this.set.length; i < e; ++i) {
+        var line = this.set[i], mk = line.marked;
+        for (var j = 0; j < mk.length; ++j) {
+          var mark = mk[j];
+          if (mark.marker == this) {
+            if (mark.from != null || mark.to != null) {
+              var found = lineNo(line);
+              if (found != null) {
+                if (mark.from != null) from = {line: found, ch: mark.from};
+                if (mark.to != null) to = {line: found, ch: mark.to};
+              }
+            }
+          }
+        }
+      }
+      return {from: from, to: to};
+    };
+
+    function markText(from, to, className) {
+      from = clipPos(from); to = clipPos(to);
+      var tm = new TextMarker();
+      if (!posLess(from, to)) return tm;
+      function add(line, from, to, className) {
+        getLine(line).addMark(new MarkedText(from, to, className, tm));
+      }
+      if (from.line == to.line) add(from.line, from.ch, to.ch, className);
+      else {
+        add(from.line, from.ch, null, className);
+        for (var i = from.line + 1, e = to.line; i < e; ++i)
+          add(i, null, null, className);
+        add(to.line, null, to.ch, className);
+      }
+      changes.push({from: from.line, to: to.line + 1});
+      return tm;
+    }
+
+    function setBookmark(pos) {
+      pos = clipPos(pos);
+      var bm = new Bookmark(pos.ch);
+      getLine(pos.line).addMark(bm);
+      return bm;
+    }
+
+    function findMarksAt(pos) {
+      pos = clipPos(pos);
+      var markers = [], marked = getLine(pos.line).marked;
+      if (!marked) return markers;
+      for (var i = 0, e = marked.length; i < e; ++i) {
+        var m = marked[i];
+        if ((m.from == null || m.from <= pos.ch) &&
+            (m.to == null || m.to >= pos.ch))
+          markers.push(m.marker || m);
+      }
+      return markers;
+    }
+
+    function addGutterMarker(line, text, className) {
+      if (typeof line == "number") line = getLine(clipLine(line));
+      line.gutterMarker = {text: text, style: className};
+      gutterDirty = true;
+      return line;
+    }
+    function removeGutterMarker(line) {
+      if (typeof line == "number") line = getLine(clipLine(line));
+      line.gutterMarker = null;
+      gutterDirty = true;
+    }
+
+    function changeLine(handle, op) {
+      var no = handle, line = handle;
+      if (typeof handle == "number") line = getLine(clipLine(handle));
+      else no = lineNo(handle);
+      if (no == null) return null;
+      if (op(line, no)) changes.push({from: no, to: no + 1});
+      else return null;
+      return line;
+    }
+    function setLineClass(handle, className, bgClassName) {
+      return changeLine(handle, function(line) {
+        if (line.className != className || line.bgClassName != bgClassName) {
+          line.className = className;
+          line.bgClassName = bgClassName;
+          return true;
+        }
+      });
+    }
+    function setLineHidden(handle, hidden) {
+      return changeLine(handle, function(line, no) {
+        if (line.hidden != hidden) {
+          line.hidden = hidden;
+          if (!options.lineWrapping) {
+            var l = line.text;
+            if (hidden && l.length == maxLine.length) {
+              updateMaxLine = true;
+            } else if (!hidden && l.length > maxLine.length) {
+              maxLine = l; updateMaxLine = false;
+            }
+          }
+          updateLineHeight(line, hidden ? 0 : 1);
+          var fline = sel.from.line, tline = sel.to.line;
+          if (hidden && (fline == no || tline == no)) {
+            var from = fline == no ? skipHidden({line: fline, ch: 0}, fline, 0) : sel.from;
+            var to = tline == no ? skipHidden({line: tline, ch: 0}, tline, 0) : sel.to;
+            // Can't hide the last visible line, we'd have no place to put the cursor
+            if (!to) return;
+            setSelection(from, to);
+          }
+          return (gutterDirty = true);
+        }
+      });
+    }
+
+    function lineInfo(line) {
+      if (typeof line == "number") {
+        if (!isLine(line)) return null;
+        var n = line;
+        line = getLine(line);
+        if (!line) return null;
+      } else {
+        var n = lineNo(line);
+        if (n == null) return null;
+      }
+      var marker = line.gutterMarker;
+      return {line: n, handle: line, text: line.text, markerText: marker && marker.text,
+              markerClass: marker && marker.style, lineClass: line.className, bgClass: line.bgClassName};
+    }
+
+    function stringWidth(str) {
+      measure.innerHTML = "
x
";
+      measure.firstChild.firstChild.firstChild.nodeValue = str;
+      return measure.firstChild.firstChild.offsetWidth || 10;
+    }
+    // These are used to go from pixel positions to character
+    // positions, taking varying character widths into account.
+    function charFromX(line, x) {
+      if (x <= 0) return 0;
+      var lineObj = getLine(line), text = lineObj.text;
+      function getX(len) {
+        return measureLine(lineObj, len).left;
+      }
+      var from = 0, fromX = 0, to = text.length, toX;
+      // Guess a suitable upper bound for our search.
+      var estimated = Math.min(to, Math.ceil(x / charWidth()));
+      for (;;) {
+        var estX = getX(estimated);
+        if (estX <= x && estimated < to) estimated = Math.min(to, Math.ceil(estimated * 1.2));
+        else {toX = estX; to = estimated; break;}
+      }
+      if (x > toX) return to;
+      // Try to guess a suitable lower bound as well.
+      estimated = Math.floor(to * 0.8); estX = getX(estimated);
+      if (estX < x) {from = estimated; fromX = estX;}
+      // Do a binary search between these bounds.
+      for (;;) {
+        if (to - from <= 1) return (toX - x > x - fromX) ? from : to;
+        var middle = Math.ceil((from + to) / 2), middleX = getX(middle);
+        if (middleX > x) {to = middle; toX = middleX;}
+        else {from = middle; fromX = middleX;}
+      }
+    }
+
+    var tempId = "CodeMirror-temp-" + Math.floor(Math.random() * 0xffffff).toString(16);
+    function measureLine(line, ch) {
+      if (ch == 0) return {top: 0, left: 0};
+      var wbr = options.lineWrapping && ch < line.text.length &&
+                spanAffectsWrapping.test(line.text.slice(ch - 1, ch + 1));
+      measure.innerHTML = "
" + line.getHTML(makeTab, ch, tempId, wbr) + "
";
+      var elt = document.getElementById(tempId);
+      var top = elt.offsetTop, left = elt.offsetLeft;
+      // Older IEs report zero offsets for spans directly after a wrap
+      if (ie && top == 0 && left == 0) {
+        var backup = document.createElement("span");
+        backup.innerHTML = "x";
+        elt.parentNode.insertBefore(backup, elt.nextSibling);
+        top = backup.offsetTop;
+      }
+      return {top: top, left: left};
+    }
+    function localCoords(pos, inLineWrap) {
+      var x, lh = textHeight(), y = lh * (heightAtLine(doc, pos.line) - (inLineWrap ? displayOffset : 0));
+      if (pos.ch == 0) x = 0;
+      else {
+        var sp = measureLine(getLine(pos.line), pos.ch);
+        x = sp.left;
+        if (options.lineWrapping) y += Math.max(0, sp.top);
+      }
+      return {x: x, y: y, yBot: y + lh};
+    }
+    // Coords must be lineSpace-local
+    function coordsChar(x, y) {
+      if (y < 0) y = 0;
+      var th = textHeight(), cw = charWidth(), heightPos = displayOffset + Math.floor(y / th);
+      var lineNo = lineAtHeight(doc, heightPos);
+      if (lineNo >= doc.size) return {line: doc.size - 1, ch: getLine(doc.size - 1).text.length};
+      var lineObj = getLine(lineNo), text = lineObj.text;
+      var tw = options.lineWrapping, innerOff = tw ? heightPos - heightAtLine(doc, lineNo) : 0;
+      if (x <= 0 && innerOff == 0) return {line: lineNo, ch: 0};
+      function getX(len) {
+        var sp = measureLine(lineObj, len);
+        if (tw) {
+          var off = Math.round(sp.top / th);
+          return Math.max(0, sp.left + (off - innerOff) * scroller.clientWidth);
+        }
+        return sp.left;
+      }
+      var from = 0, fromX = 0, to = text.length, toX;
+      // Guess a suitable upper bound for our search.
+      var estimated = Math.min(to, Math.ceil((x + innerOff * scroller.clientWidth * .9) / cw));
+      for (;;) {
+        var estX = getX(estimated);
+        if (estX <= x && estimated < to) estimated = Math.min(to, Math.ceil(estimated * 1.2));
+        else {toX = estX; to = estimated; break;}
+      }
+      if (x > toX) return {line: lineNo, ch: to};
+      // Try to guess a suitable lower bound as well.
+      estimated = Math.floor(to * 0.8); estX = getX(estimated);
+      if (estX < x) {from = estimated; fromX = estX;}
+      // Do a binary search between these bounds.
+      for (;;) {
+        if (to - from <= 1) return {line: lineNo, ch: (toX - x > x - fromX) ? from : to};
+        var middle = Math.ceil((from + to) / 2), middleX = getX(middle);
+        if (middleX > x) {to = middle; toX = middleX;}
+        else {from = middle; fromX = middleX;}
+      }
+    }
+    function pageCoords(pos) {
+      var local = localCoords(pos, true), off = eltOffset(lineSpace);
+      return {x: off.left + local.x, y: off.top + local.y, yBot: off.top + local.yBot};
+    }
+
+    var cachedHeight, cachedHeightFor, measureText;
+    function textHeight() {
+      if (measureText == null) {
+        measureText = "
";
+        for (var i = 0; i < 49; ++i) measureText += "x
";
+        measureText += "x
";
+      }
+      var offsetHeight = lineDiv.clientHeight;
+      if (offsetHeight == cachedHeightFor) return cachedHeight;
+      cachedHeightFor = offsetHeight;
+      measure.innerHTML = measureText;
+      cachedHeight = measure.firstChild.offsetHeight / 50 || 1;
+      measure.innerHTML = "";
+      return cachedHeight;
+    }
+    var cachedWidth, cachedWidthFor = 0;
+    function charWidth() {
+      if (scroller.clientWidth == cachedWidthFor) return cachedWidth;
+      cachedWidthFor = scroller.clientWidth;
+      return (cachedWidth = stringWidth("x"));
+    }
+    function paddingTop() {return lineSpace.offsetTop;}
+    function paddingLeft() {return lineSpace.offsetLeft;}
+
+    function posFromMouse(e, liberal) {
+      var offW = eltOffset(scroller, true), x, y;
+      // Fails unpredictably on IE[67] when mouse is dragged around quickly.
+      try { x = e.clientX; y = e.clientY; } catch (e) { return null; }
+      // This is a mess of a heuristic to try and determine whether a
+      // scroll-bar was clicked or not, and to return null if one was
+      // (and !liberal).
+      if (!liberal && (x - offW.left > scroller.clientWidth || y - offW.top > scroller.clientHeight))
+        return null;
+      var offL = eltOffset(lineSpace, true);
+      return coordsChar(x - offL.left, y - offL.top);
+    }
+    function onContextMenu(e) {
+      var pos = posFromMouse(e), scrollPos = scrollbar.scrollTop;
+      if (!pos || opera) return; // Opera is difficult.
+      if (posEq(sel.from, sel.to) || posLess(pos, sel.from) || !posLess(pos, sel.to))
+        operation(setCursor)(pos.line, pos.ch);
+
+      var oldCSS = input.style.cssText;
+      inputDiv.style.position = "absolute";
+      input.style.cssText = "position: fixed; width: 30px; height: 30px; top: " + (e.clientY - 5) +
+        "px; left: " + (e.clientX - 5) + "px; z-index: 1000; background: white; " +
+        "border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
+      leaveInputAlone = true;
+      var val = input.value = getSelection();
+      focusInput();
+      selectInput(input);
+      function rehide() {
+        var newVal = splitLines(input.value).join("\n");
+        if (newVal != val && !options.readOnly) operation(replaceSelection)(newVal, "end");
+        inputDiv.style.position = "relative";
+        input.style.cssText = oldCSS;
+        if (ie_lt9) scrollbar.scrollTop = scrollPos;
+        leaveInputAlone = false;
+        resetInput(true);
+        slowPoll();
+      }
+
+      if (gecko) {
+        e_stop(e);
+        var mouseup = connect(window, "mouseup", function() {
+          mouseup();
+          setTimeout(rehide, 20);
+        }, true);
+      } else {
+        setTimeout(rehide, 50);
+      }
+    }
+
+    // Cursor-blinking
+    function restartBlink() {
+      clearInterval(blinker);
+      var on = true;
+      cursor.style.visibility = "";
+      blinker = setInterval(function() {
+        cursor.style.visibility = (on = !on) ? "" : "hidden";
+      }, 650);
+    }
+
+    var matching = {"(": ")>", ")": "(<", "[": "]>", "]": "[<", "{": "}>", "}": "{<"};
+    function matchBrackets(autoclear) {
+      var head = sel.inverted ? sel.from : sel.to, line = getLine(head.line), pos = head.ch - 1;
+      var match = (pos >= 0 && matching[line.text.charAt(pos)]) || matching[line.text.charAt(++pos)];
+      if (!match) return;
+      var ch = match.charAt(0), forward = match.charAt(1) == ">", d = forward ? 1 : -1, st = line.styles;
+      for (var off = pos + 1, i = 0, e = st.length; i < e; i+=2)
+        if ((off -= st[i].length) <= 0) {var style = st[i+1]; break;}
+
+      var stack = [line.text.charAt(pos)], re = /[(){}[\]]/;
+      function scan(line, from, to) {
+        if (!line.text) return;
+        var st = line.styles, pos = forward ? 0 : line.text.length - 1, cur;
+        for (var i = forward ? 0 : st.length - 2, e = forward ? st.length : -2; i != e; i += 2*d) {
+          var text = st[i];
+          if (st[i+1] != style) {pos += d * text.length; continue;}
+          for (var j = forward ? 0 : text.length - 1, te = forward ? text.length : -1; j != te; j += d, pos+=d) {
+            if (pos >= from && pos < to && re.test(cur = text.charAt(j))) {
+              var match = matching[cur];
+              if (match.charAt(1) == ">" == forward) stack.push(cur);
+              else if (stack.pop() != match.charAt(0)) return {pos: pos, match: false};
+              else if (!stack.length) return {pos: pos, match: true};
+            }
+          }
+        }
+      }
+      for (var i = head.line, e = forward ? Math.min(i + 100, doc.size) : Math.max(-1, i - 100); i != e; i+=d) {
+        var line = getLine(i), first = i == head.line;
+        var found = scan(line, first && forward ? pos + 1 : 0, first && !forward ? pos : line.text.length);
+        if (found) break;
+      }
+      if (!found) found = {pos: null, match: false};
+      var style = found.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket";
+      var one = markText({line: head.line, ch: pos}, {line: head.line, ch: pos+1}, style),
+          two = found.pos != null && markText({line: i, ch: found.pos}, {line: i, ch: found.pos + 1}, style);
+      var clear = operation(function(){one.clear(); two && two.clear();});
+      if (autoclear) setTimeout(clear, 800);
+      else bracketHighlighted = clear;
+    }
+
+    // Finds the line to start with when starting a parse. Tries to
+    // find a line with a stateAfter, so that it can start with a
+    // valid state. If that fails, it returns the line with the
+    // smallest indentation, which tends to need the least context to
+    // parse correctly.
+    function findStartLine(n) {
+      var minindent, minline;
+      for (var search = n, lim = n - 40; search > lim; --search) {
+        if (search == 0) return 0;
+        var line = getLine(search-1);
+        if (line.stateAfter) return search;
+        var indented = line.indentation(options.tabSize);
+        if (minline == null || minindent > indented) {
+          minline = search - 1;
+          minindent = indented;
+        }
+      }
+      return minline;
+    }
+    function getStateBefore(n) {
+      var start = findStartLine(n), state = start && getLine(start-1).stateAfter;
+      if (!state) state = startState(mode);
+      else state = copyState(mode, state);
+      doc.iter(start, n, function(line) {
+        line.highlight(mode, state, options.tabSize);
+        line.stateAfter = copyState(mode, state);
+      });
+      if (start < n) changes.push({from: start, to: n});
+      if (n < doc.size && !getLine(n).stateAfter) work.push(n);
+      return state;
+    }
+    function highlightLines(start, end) {
+      var state = getStateBefore(start);
+      doc.iter(start, end, function(line) {
+        line.highlight(mode, state, options.tabSize);
+        line.stateAfter = copyState(mode, state);
+      });
+    }
+    function highlightWorker() {
+      var end = +new Date + options.workTime;
+      var foundWork = work.length;
+      while (work.length) {
+        if (!getLine(showingFrom).stateAfter) var task = showingFrom;
+        else var task = work.pop();
+        if (task >= doc.size) continue;
+        var start = findStartLine(task), state = start && getLine(start-1).stateAfter;
+        if (state) state = copyState(mode, state);
+        else state = startState(mode);
+
+        var unchanged = 0, compare = mode.compareStates, realChange = false,
+            i = start, bail = false;
+        doc.iter(i, doc.size, function(line) {
+          var hadState = line.stateAfter;
+          if (+new Date > end) {
+            work.push(i);
+            startWorker(options.workDelay);
+            if (realChange) changes.push({from: task, to: i + 1});
+            return (bail = true);
+          }
+          var changed = line.highlight(mode, state, options.tabSize);
+          if (changed) realChange = true;
+          line.stateAfter = copyState(mode, state);
+          var done = null;
+          if (compare) {
+            var same = hadState && compare(hadState, state);
+            if (same != Pass) done = !!same;
+          }
+          if (done == null) {
+            if (changed !== false || !hadState) unchanged = 0;
+            else if (++unchanged > 3 && (!mode.indent || mode.indent(hadState, "") == mode.indent(state, "")))
+              done = true;
+          }
+          if (done) return true;
+          ++i;
+        });
+        if (bail) return;
+        if (realChange) changes.push({from: task, to: i + 1});
+      }
+      if (foundWork && options.onHighlightComplete)
+        options.onHighlightComplete(instance);
+    }
+    function startWorker(time) {
+      if (!work.length) return;
+      highlight.set(time, operation(highlightWorker));
+    }
+
+    // Operations are used to wrap changes in such a way that each
+    // change won't have to update the cursor and display (which would
+    // be awkward, slow, and error-prone), but instead updates are
+    // batched and then all combined and executed at once.
+    function startOperation() {
+      updateInput = userSelChange = textChanged = null;
+      changes = []; selectionChanged = false; callbacks = [];
+    }
+    function endOperation() {
+      if (updateMaxLine) computeMaxLength();
+      if (maxLineChanged && !options.lineWrapping) {
+        var cursorWidth = widthForcer.offsetWidth, left = stringWidth(maxLine);
+        widthForcer.style.left = left + "px";
+        lineSpace.style.minWidth = (left + cursorWidth) + "px";
+        maxLineChanged = false;
+      }
+      var newScrollPos, updated;
+      if (selectionChanged) {
+        var coords = calculateCursorCoords();
+        newScrollPos = calculateScrollPos(coords.x, coords.y, coords.x, coords.yBot);
+      }
+      if (changes.length) updated = updateDisplay(changes, true, (newScrollPos ? newScrollPos.scrollTop : null));
+      else {
+        if (selectionChanged) updateSelection();
+        if (gutterDirty) updateGutter();
+      }
+      if (newScrollPos) scrollCursorIntoView();
+      if (selectionChanged) {scrollEditorIntoView(); restartBlink();}
+
+      if (focused && !leaveInputAlone &&
+          (updateInput === true || (updateInput !== false && selectionChanged)))
+        resetInput(userSelChange);
+
+      if (selectionChanged && options.matchBrackets)
+        setTimeout(operation(function() {
+          if (bracketHighlighted) {bracketHighlighted(); bracketHighlighted = null;}
+          if (posEq(sel.from, sel.to)) matchBrackets(false);
+        }), 20);
+      var sc = selectionChanged, cbs = callbacks; // these can be reset by callbacks
+      if (textChanged && options.onChange && instance)
+        options.onChange(instance, textChanged);
+      if (sc && options.onCursorActivity)
+        options.onCursorActivity(instance);
+      for (var i = 0; i < cbs.length; ++i) cbs[i](instance);
+      if (updated && options.onUpdate) options.onUpdate(instance);
+    }
+    var nestedOperation = 0;
+    function operation(f) {
+      return function() {
+        if (!nestedOperation++) startOperation();
+        try {var result = f.apply(this, arguments);}
+        finally {if (!--nestedOperation) endOperation();}
+        return result;
+      };
+    }
+
+    function compoundChange(f) {
+      history.startCompound();
+      try { return f(); } finally { history.endCompound(); }
+    }
+
+    for (var ext in extensions)
+      if (extensions.propertyIsEnumerable(ext) &&
+          !instance.propertyIsEnumerable(ext))
+        instance[ext] = extensions[ext];
+    return instance;
+  } // (end of function CodeMirror)
+
+  // The default configuration options.
+  CodeMirror.defaults = {
+    value: "",
+    mode: null,
+    theme: "default",
+    indentUnit: 2,
+    indentWithTabs: false,
+    smartIndent: true,
+    tabSize: 4,
+    keyMap: "default",
+    extraKeys: null,
+    electricChars: true,
+    autoClearEmptyLines: false,
+    onKeyEvent: null,
+    onDragEvent: null,
+    lineWrapping: false,
+    lineNumbers: false,
+    gutter: false,
+    fixedGutter: false,
+    firstLineNumber: 1,
+    readOnly: false,
+    dragDrop: true,
+    onChange: null,
+    onCursorActivity: null,
+    onGutterClick: null,
+    onHighlightComplete: null,
+    onUpdate: null,
+    onFocus: null, onBlur: null, onScroll: null,
+    matchBrackets: false,
+    workTime: 100,
+    workDelay: 200,
+    pollInterval: 100,
+    undoDepth: 40,
+    tabindex: null,
+    autofocus: null,
+    lineNumberFormatter: function(integer) { return integer; }
+  };
+
+  var ios = /AppleWebKit/.test(navigator.userAgent) && /Mobile\/\w+/.test(navigator.userAgent);
+  var mac = ios || /Mac/.test(navigator.platform);
+  var win = /Win/.test(navigator.platform);
+
+  // Known modes, by name and by MIME
+  var modes = CodeMirror.modes = {}, mimeModes = CodeMirror.mimeModes = {};
+  CodeMirror.defineMode = function(name, mode) {
+    if (!CodeMirror.defaults.mode && name != "null") CodeMirror.defaults.mode = name;
+    if (arguments.length > 2) {
+      mode.dependencies = [];
+      for (var i = 2; i < arguments.length; ++i) mode.dependencies.push(arguments[i]);
+    }
+    modes[name] = mode;
+  };
+  CodeMirror.defineMIME = function(mime, spec) {
+    mimeModes[mime] = spec;
+  };
+  CodeMirror.resolveMode = function(spec) {
+    if (typeof spec == "string" && mimeModes.hasOwnProperty(spec))
+      spec = mimeModes[spec];
+    else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec))
+      return CodeMirror.resolveMode("application/xml");
+    if (typeof spec == "string") return {name: spec};
+    else return spec || {name: "null"};
+  };
+  CodeMirror.getMode = function(options, spec) {
+    var spec = CodeMirror.resolveMode(spec);
+    var mfactory = modes[spec.name];
+    if (!mfactory) return CodeMirror.getMode(options, "text/plain");
+    return mfactory(options, spec);
+  };
+  CodeMirror.listModes = function() {
+    var list = [];
+    for (var m in modes)
+      if (modes.propertyIsEnumerable(m)) list.push(m);
+    return list;
+  };
+  CodeMirror.listMIMEs = function() {
+    var list = [];
+    for (var m in mimeModes)
+      if (mimeModes.propertyIsEnumerable(m)) list.push({mime: m, mode: mimeModes[m]});
+    return list;
+  };
+
+  var extensions = CodeMirror.extensions = {};
+  CodeMirror.defineExtension = function(name, func) {
+    extensions[name] = func;
+  };
+
+  var commands = CodeMirror.commands = {
+    selectAll: function(cm) {cm.setSelection({line: 0, ch: 0}, {line: cm.lineCount() - 1});},
+    killLine: function(cm) {
+      var from = cm.getCursor(true), to = cm.getCursor(false), sel = !posEq(from, to);
+      if (!sel && cm.getLine(from.line).length == from.ch) cm.replaceRange("", from, {line: from.line + 1, ch: 0});
+      else cm.replaceRange("", from, sel ? to : {line: from.line});
+    },
+    deleteLine: function(cm) {var l = cm.getCursor().line; cm.replaceRange("", {line: l, ch: 0}, {line: l});},
+    undo: function(cm) {cm.undo();},
+    redo: function(cm) {cm.redo();},
+    goDocStart: function(cm) {cm.setCursor(0, 0, true);},
+    goDocEnd: function(cm) {cm.setSelection({line: cm.lineCount() - 1}, null, true);},
+    goLineStart: function(cm) {cm.setCursor(cm.getCursor().line, 0, true);},
+    goLineStartSmart: function(cm) {
+      var cur = cm.getCursor();
+      var text = cm.getLine(cur.line), firstNonWS = Math.max(0, text.search(/\S/));
+      cm.setCursor(cur.line, cur.ch <= firstNonWS && cur.ch ? 0 : firstNonWS, true);
+    },
+    goLineEnd: function(cm) {cm.setSelection({line: cm.getCursor().line}, null, true);},
+    goLineUp: function(cm) {cm.moveV(-1, "line");},
+    goLineDown: function(cm) {cm.moveV(1, "line");},
+    goPageUp: function(cm) {cm.moveV(-1, "page");},
+    goPageDown: function(cm) {cm.moveV(1, "page");},
+    goCharLeft: function(cm) {cm.moveH(-1, "char");},
+    goCharRight: function(cm) {cm.moveH(1, "char");},
+    goColumnLeft: function(cm) {cm.moveH(-1, "column");},
+    goColumnRight: function(cm) {cm.moveH(1, "column");},
+    goWordLeft: function(cm) {cm.moveH(-1, "word");},
+    goWordRight: function(cm) {cm.moveH(1, "word");},
+    delCharLeft: function(cm) {cm.deleteH(-1, "char");},
+    delCharRight: function(cm) {cm.deleteH(1, "char");},
+    delWordLeft: function(cm) {cm.deleteH(-1, "word");},
+    delWordRight: function(cm) {cm.deleteH(1, "word");},
+    indentAuto: function(cm) {cm.indentSelection("smart");},
+    indentMore: function(cm) {cm.indentSelection("add");},
+    indentLess: function(cm) {cm.indentSelection("subtract");},
+    insertTab: function(cm) {cm.replaceSelection("\t", "end");},
+    defaultTab: function(cm) {
+      if (cm.somethingSelected()) cm.indentSelection("add");
+      else cm.replaceSelection("\t", "end");
+    },
+    transposeChars: function(cm) {
+      var cur = cm.getCursor(), line = cm.getLine(cur.line);
+      if (cur.ch > 0 && cur.ch < line.length - 1)
+        cm.replaceRange(line.charAt(cur.ch) + line.charAt(cur.ch - 1),
+                        {line: cur.line, ch: cur.ch - 1}, {line: cur.line, ch: cur.ch + 1});
+    },
+    newlineAndIndent: function(cm) {
+      cm.replaceSelection("\n", "end");
+      cm.indentLine(cm.getCursor().line);
+    },
+    toggleOverwrite: function(cm) {cm.toggleOverwrite();}
+  };
+
+  var keyMap = CodeMirror.keyMap = {};
+  keyMap.basic = {
+    "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
+    "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
+    "Delete": "delCharRight", "Backspace": "delCharLeft", "Tab": "defaultTab", "Shift-Tab": "indentAuto",
+    "Enter": "newlineAndIndent", "Insert": "toggleOverwrite"
+  };
+  // Note that the save and find-related commands aren't defined by
+  // default. Unknown commands are simply ignored.
+  keyMap.pcDefault = {
+    "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
+    "Ctrl-Home": "goDocStart", "Alt-Up": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Down": "goDocEnd",
+    "Ctrl-Left": "goWordLeft", "Ctrl-Right": "goWordRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
+    "Ctrl-Backspace": "delWordLeft", "Ctrl-Delete": "delWordRight", "Ctrl-S": "save", "Ctrl-F": "find",
+    "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
+    "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
+    fallthrough: "basic"
+  };
+  keyMap.macDefault = {
+    "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
+    "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goWordLeft",
+    "Alt-Right": "goWordRight", "Cmd-Left": "goLineStart", "Cmd-Right": "goLineEnd", "Alt-Backspace": "delWordLeft",
+    "Ctrl-Alt-Backspace": "delWordRight", "Alt-Delete": "delWordRight", "Cmd-S": "save", "Cmd-F": "find",
+    "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
+    "Cmd-[": "indentLess", "Cmd-]": "indentMore",
+    fallthrough: ["basic", "emacsy"]
+  };
+  keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;
+  keyMap.emacsy = {
+    "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
+    "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
+    "Ctrl-V": "goPageUp", "Shift-Ctrl-V": "goPageDown", "Ctrl-D": "delCharRight", "Ctrl-H": "delCharLeft",
+    "Alt-D": "delWordRight", "Alt-Backspace": "delWordLeft", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars"
+  };
+
+  function getKeyMap(val) {
+    if (typeof val == "string") return keyMap[val];
+    else return val;
+  }
+  function lookupKey(name, extraMap, map, handle, stop) {
+    function lookup(map) {
+      map = getKeyMap(map);
+      var found = map[name];
+      if (found != null && handle(found)) return true;
+      if (map.nofallthrough) {
+        if (stop) stop();
+        return true;
+      }
+      var fallthrough = map.fallthrough;
+      if (fallthrough == null) return false;
+      if (Object.prototype.toString.call(fallthrough) != "[object Array]")
+        return lookup(fallthrough);
+      for (var i = 0, e = fallthrough.length; i < e; ++i) {
+        if (lookup(fallthrough[i])) return true;
+      }
+      return false;
+    }
+    if (extraMap && lookup(extraMap)) return true;
+    return lookup(map);
+  }
+  function isModifierKey(event) {
+    var name = keyNames[e_prop(event, "keyCode")];
+    return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod";
+  }
+
+  CodeMirror.fromTextArea = function(textarea, options) {
+    if (!options) options = {};
+    options.value = textarea.value;
+    if (!options.tabindex && textarea.tabindex)
+      options.tabindex = textarea.tabindex;
+    if (options.autofocus == null && textarea.getAttribute("autofocus") != null)
+      options.autofocus = true;
+
+    function save() {textarea.value = instance.getValue();}
+    if (textarea.form) {
+      // Deplorable hack to make the submit method do the right thing.
+      var rmSubmit = connect(textarea.form, "submit", save, true);
+      if (typeof textarea.form.submit == "function") {
+        var realSubmit = textarea.form.submit;
+        function wrappedSubmit() {
+          save();
+          textarea.form.submit = realSubmit;
+          textarea.form.submit();
+          textarea.form.submit = wrappedSubmit;
+        }
+        textarea.form.submit = wrappedSubmit;
+      }
+    }
+
+    textarea.style.display = "none";
+    var instance = CodeMirror(function(node) {
+      textarea.parentNode.insertBefore(node, textarea.nextSibling);
+    }, options);
+    instance.save = save;
+    instance.getTextArea = function() { return textarea; };
+    instance.toTextArea = function() {
+      save();
+      textarea.parentNode.removeChild(instance.getWrapperElement());
+      textarea.style.display = "";
+      if (textarea.form) {
+        rmSubmit();
+        if (typeof textarea.form.submit == "function")
+          textarea.form.submit = realSubmit;
+      }
+    };
+    return instance;
+  };
+
+  // Utility functions for working with state. Exported because modes
+  // sometimes need to do this.
+  function copyState(mode, state) {
+    if (state === true) return state;
+    if (mode.copyState) return mode.copyState(state);
+    var nstate = {};
+    for (var n in state) {
+      var val = state[n];
+      if (val instanceof Array) val = val.concat([]);
+      nstate[n] = val;
+    }
+    return nstate;
+  }
+  CodeMirror.copyState = copyState;
+  function startState(mode, a1, a2) {
+    return mode.startState ? mode.startState(a1, a2) : true;
+  }
+  CodeMirror.startState = startState;
+
+  // The character stream used by a mode's parser.
+  function StringStream(string, tabSize) {
+    this.pos = this.start = 0;
+    this.string = string;
+    this.tabSize = tabSize || 8;
+  }
+  StringStream.prototype = {
+    eol: function() {return this.pos >= this.string.length;},
+    sol: function() {return this.pos == 0;},
+    peek: function() {return this.string.charAt(this.pos);},
+    next: function() {
+      if (this.pos < this.string.length)
+        return this.string.charAt(this.pos++);
+    },
+    eat: function(match) {
+      var ch = this.string.charAt(this.pos);
+      if (typeof match == "string") var ok = ch == match;
+      else var ok = ch && (match.test ? match.test(ch) : match(ch));
+      if (ok) {++this.pos; return ch;}
+    },
+    eatWhile: function(match) {
+      var start = this.pos;
+      while (this.eat(match)){}
+      return this.pos > start;
+    },
+    eatSpace: function() {
+      var start = this.pos;
+      while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos;
+      return this.pos > start;
+    },
+    skipToEnd: function() {this.pos = this.string.length;},
+    skipTo: function(ch) {
+      var found = this.string.indexOf(ch, this.pos);
+      if (found > -1) {this.pos = found; return true;}
+    },
+    backUp: function(n) {this.pos -= n;},
+    column: function() {return countColumn(this.string, this.start, this.tabSize);},
+    indentation: function() {return countColumn(this.string, null, this.tabSize);},
+    match: function(pattern, consume, caseInsensitive) {
+      if (typeof pattern == "string") {
+        function cased(str) {return caseInsensitive ? str.toLowerCase() : str;}
+        if (cased(this.string).indexOf(cased(pattern), this.pos) == this.pos) {
+          if (consume !== false) this.pos += pattern.length;
+          return true;
+        }
+      } else {
+        var match = this.string.slice(this.pos).match(pattern);
+        if (match && consume !== false) this.pos += match[0].length;
+        return match;
+      }
+    },
+    current: function(){return this.string.slice(this.start, this.pos);}
+  };
+  CodeMirror.StringStream = StringStream;
+
+  function MarkedText(from, to, className, marker) {
+    this.from = from; this.to = to; this.style = className; this.marker = marker;
+  }
+  MarkedText.prototype = {
+    attach: function(line) { this.marker.set.push(line); },
+    detach: function(line) {
+      var ix = indexOf(this.marker.set, line);
+      if (ix > -1) this.marker.set.splice(ix, 1);
+    },
+    split: function(pos, lenBefore) {
+      if (this.to <= pos && this.to != null) return null;
+      var from = this.from < pos || this.from == null ? null : this.from - pos + lenBefore;
+      var to = this.to == null ? null : this.to - pos + lenBefore;
+      return new MarkedText(from, to, this.style, this.marker);
+    },
+    dup: function() { return new MarkedText(null, null, this.style, this.marker); },
+    clipTo: function(fromOpen, from, toOpen, to, diff) {
+      if (fromOpen && to > this.from && (to < this.to || this.to == null))
+        this.from = null;
+      else if (this.from != null && this.from >= from)
+        this.from = Math.max(to, this.from) + diff;
+      if (toOpen && (from < this.to || this.to == null) && (from > this.from || this.from == null))
+        this.to = null;
+      else if (this.to != null && this.to > from)
+        this.to = to < this.to ? this.to + diff : from;
+    },
+    isDead: function() { return this.from != null && this.to != null && this.from >= this.to; },
+    sameSet: function(x) { return this.marker == x.marker; }
+  };
+
+  function Bookmark(pos) {
+    this.from = pos; this.to = pos; this.line = null;
+  }
+  Bookmark.prototype = {
+    attach: function(line) { this.line = line; },
+    detach: function(line) { if (this.line == line) this.line = null; },
+    split: function(pos, lenBefore) {
+      if (pos < this.from) {
+        this.from = this.to = (this.from - pos) + lenBefore;
+        return this;
+      }
+    },
+    isDead: function() { return this.from > this.to; },
+    clipTo: function(fromOpen, from, toOpen, to, diff) {
+      if ((fromOpen || from < this.from) && (toOpen || to > this.to)) {
+        this.from = 0; this.to = -1;
+      } else if (this.from > from) {
+        this.from = this.to = Math.max(to, this.from) + diff;
+      }
+    },
+    sameSet: function(x) { return false; },
+    find: function() {
+      if (!this.line || !this.line.parent) return null;
+      return {line: lineNo(this.line), ch: this.from};
+    },
+    clear: function() {
+      if (this.line) {
+        var found = indexOf(this.line.marked, this);
+        if (found != -1) this.line.marked.splice(found, 1);
+        this.line = null;
+      }
+    }
+  };
+
+  // Line objects. These hold state related to a line, including
+  // highlighting info (the styles array).
+  function Line(text, styles) {
+    this.styles = styles || [text, null];
+    this.text = text;
+    this.height = 1;
+    this.marked = this.gutterMarker = this.className = this.bgClassName = this.handlers = null;
+    this.stateAfter = this.parent = this.hidden = null;
+  }
+  Line.inheritMarks = function(text, orig) {
+    var ln = new Line(text), mk = orig && orig.marked;
+    if (mk) {
+      for (var i = 0; i < mk.length; ++i) {
+        if (mk[i].to == null && mk[i].style) {
+          var newmk = ln.marked || (ln.marked = []), mark = mk[i];
+          var nmark = mark.dup(); newmk.push(nmark); nmark.attach(ln);
+        }
+      }
+    }
+    return ln;
+  }
+  Line.prototype = {
+    // Replace a piece of a line, keeping the styles around it intact.
+    replace: function(from, to_, text) {
+      var st = [], mk = this.marked, to = to_ == null ? this.text.length : to_;
+      copyStyles(0, from, this.styles, st);
+      if (text) st.push(text, null);
+      copyStyles(to, this.text.length, this.styles, st);
+      this.styles = st;
+      this.text = this.text.slice(0, from) + text + this.text.slice(to);
+      this.stateAfter = null;
+      if (mk) {
+        var diff = text.length - (to - from);
+        for (var i = 0; i < mk.length; ++i) {
+          var mark = mk[i];
+          mark.clipTo(from == null, from || 0, to_ == null, to, diff);
+          if (mark.isDead()) {mark.detach(this); mk.splice(i--, 1);}
+        }
+      }
+    },
+    // Split a part off a line, keeping styles and markers intact.
+    split: function(pos, textBefore) {
+      var st = [textBefore, null], mk = this.marked;
+      copyStyles(pos, this.text.length, this.styles, st);
+      var taken = new Line(textBefore + this.text.slice(pos), st);
+      if (mk) {
+        for (var i = 0; i < mk.length; ++i) {
+          var mark = mk[i];
+          var newmark = mark.split(pos, textBefore.length);
+          if (newmark) {
+            if (!taken.marked) taken.marked = [];
+            taken.marked.push(newmark); newmark.attach(taken);
+            if (newmark == mark) mk.splice(i--, 1);
+          }
+        }
+      }
+      return taken;
+    },
+    append: function(line) {
+      var mylen = this.text.length, mk = line.marked, mymk = this.marked;
+      this.text += line.text;
+      copyStyles(0, line.text.length, line.styles, this.styles);
+      if (mymk) {
+        for (var i = 0; i < mymk.length; ++i)
+          if (mymk[i].to == null) mymk[i].to = mylen;
+      }
+      if (mk && mk.length) {
+        if (!mymk) this.marked = mymk = [];
+        outer: for (var i = 0; i < mk.length; ++i) {
+          var mark = mk[i];
+          if (!mark.from) {
+            for (var j = 0; j < mymk.length; ++j) {
+              var mymark = mymk[j];
+              if (mymark.to == mylen && mymark.sameSet(mark)) {
+                mymark.to = mark.to == null ? null : mark.to + mylen;
+                if (mymark.isDead()) {
+                  mymark.detach(this);
+                  mk.splice(i--, 1);
+                }
+                continue outer;
+              }
+            }
+          }
+          mymk.push(mark);
+          mark.attach(this);
+          mark.from += mylen;
+          if (mark.to != null) mark.to += mylen;
+        }
+      }
+    },
+    fixMarkEnds: function(other) {
+      var mk = this.marked, omk = other.marked;
+      if (!mk) return;
+      outer: for (var i = 0; i < mk.length; ++i) {
+        var mark = mk[i], close = mark.to == null;
+        if (close && omk) {
+          for (var j = 0; j < omk.length; ++j) {
+            var om = omk[j];
+            if (!om.sameSet(mark) || om.from != null) continue
+            if (mark.from == this.text.length && om.to == 0) {
+              omk.splice(j, 1);
+              mk.splice(i--, 1);
+              continue outer;
+            } else {
+              close = false; break;
+            }
+          }
+        }
+        if (close) mark.to = this.text.length;
+      }
+    },
+    fixMarkStarts: function() {
+      var mk = this.marked;
+      if (!mk) return;
+      for (var i = 0; i < mk.length; ++i)
+        if (mk[i].from == null) mk[i].from = 0;
+    },
+    addMark: function(mark) {
+      mark.attach(this);
+      if (this.marked == null) this.marked = [];
+      this.marked.push(mark);
+      this.marked.sort(function(a, b){return (a.from || 0) - (b.from || 0);});
+    },
+    // Run the given mode's parser over a line, update the styles
+    // array, which contains alternating fragments of text and CSS
+    // classes.
+    highlight: function(mode, state, tabSize) {
+      var stream = new StringStream(this.text, tabSize), st = this.styles, pos = 0;
+      var changed = false, curWord = st[0], prevWord;
+      if (this.text == "" && mode.blankLine) mode.blankLine(state);
+      while (!stream.eol()) {
+        var style = mode.token(stream, state);
+        var substr = this.text.slice(stream.start, stream.pos);
+        stream.start = stream.pos;
+        if (pos && st[pos-1] == style)
+          st[pos-2] += substr;
+        else if (substr) {
+          if (!changed && (st[pos+1] != style || (pos && st[pos-2] != prevWord))) changed = true;
+          st[pos++] = substr; st[pos++] = style;
+          prevWord = curWord; curWord = st[pos];
+        }
+        // Give up when line is ridiculously long
+        if (stream.pos > 5000) {
+          st[pos++] = this.text.slice(stream.pos); st[pos++] = null;
+          break;
+        }
+      }
+      if (st.length != pos) {st.length = pos; changed = true;}
+      if (pos && st[pos-2] != prevWord) changed = true;
+      // Short lines with simple highlights return null, and are
+      // counted as changed by the driver because they are likely to
+      // highlight the same way in various contexts.
+      return changed || (st.length < 5 && this.text.length < 10 ? null : false);
+    },
+    // Fetch the parser token for a given character. Useful for hacks
+    // that want to inspect the mode state (say, for completion).
+    getTokenAt: function(mode, state, ch) {
+      var txt = this.text, stream = new StringStream(txt);
+      while (stream.pos < ch && !stream.eol()) {
+        stream.start = stream.pos;
+        var style = mode.token(stream, state);
+      }
+      return {start: stream.start,
+              end: stream.pos,
+              string: stream.current(),
+              className: style || null,
+              state: state};
+    },
+    indentation: function(tabSize) {return countColumn(this.text, null, tabSize);},
+    // Produces an HTML fragment for the line, taking selection,
+    // marking, and highlighting into account.
+    getHTML: function(makeTab, wrapAt, wrapId, wrapWBR) {
+      var html = [], first = true, col = 0;
+      function span_(text, style) {
+        if (!text) return;
+        // Work around a bug where, in some compat modes, IE ignores leading spaces
+        if (first && ie && text.charAt(0) == " ") text = "\u00a0" + text.slice(1);
+        first = false;
+        if (text.indexOf("\t") == -1) {
+          col += text.length;
+          var escaped = htmlEscape(text);
+        } else {
+          var escaped = "";
+          for (var pos = 0;;) {
+            var idx = text.indexOf("\t", pos);
+            if (idx == -1) {
+              escaped += htmlEscape(text.slice(pos));
+              col += text.length - pos;
+              break;
+            } else {
+              col += idx - pos;
+              var tab = makeTab(col);
+              escaped += htmlEscape(text.slice(pos, idx)) + tab.html;
+              col += tab.width;
+              pos = idx + 1;
+            }
+          }
+        }
+        if (style) html.push('', escaped, "");
+        else html.push(escaped);
+      }
+      var span = span_;
+      if (wrapAt != null) {
+        var outPos = 0, open = "";
+        span = function(text, style) {
+          var l = text.length;
+          if (wrapAt >= outPos && wrapAt < outPos + l) {
+            if (wrapAt > outPos) {
+              span_(text.slice(0, wrapAt - outPos), style);
+              // See comment at the definition of spanAffectsWrapping
+              if (wrapWBR) html.push("");
+            }
+            html.push(open);
+            var cut = wrapAt - outPos;
+            span_(opera ? text.slice(cut, cut + 1) : text.slice(cut), style);
+            html.push("");
+            if (opera) span_(text.slice(cut + 1), style);
+            wrapAt--;
+            outPos += l;
+          } else {
+            outPos += l;
+            span_(text, style);
+            // Output empty wrapper when at end of line
+            // (Gecko and IE8+ do strange wrapping when adding a space
+            // to the end of the line. Other browsers don't react well
+            // to zero-width spaces. So we do hideous browser sniffing
+            // to determine which to use.)
+            if (outPos == wrapAt && outPos == len)
+              html.push(open + (gecko || (ie && !ie_lt8) ? "​" : " ") + "");
+            // Stop outputting HTML when gone sufficiently far beyond measure
+            else if (outPos > wrapAt + 10 && /\s/.test(text)) span = function(){};
+          }
+        }
+      }
+
+      var st = this.styles, allText = this.text, marked = this.marked;
+      var len = allText.length;
+      function styleToClass(style) {
+        if (!style) return null;
+        return "cm-" + style.replace(/ +/g, " cm-");
+      }
+
+      if (!allText && wrapAt == null) {
+        span(" ");
+      } else if (!marked || !marked.length) {
+        for (var i = 0, ch = 0; ch < len; i+=2) {
+          var str = st[i], style = st[i+1], l = str.length;
+          if (ch + l > len) str = str.slice(0, len - ch);
+          ch += l;
+          span(str, styleToClass(style));
+        }
+      } else {
+        var pos = 0, i = 0, text = "", style, sg = 0;
+        var nextChange = marked[0].from || 0, marks = [], markpos = 0;
+        function advanceMarks() {
+          var m;
+          while (markpos < marked.length &&
+                 ((m = marked[markpos]).from == pos || m.from == null)) {
+            if (m.style != null) marks.push(m);
+            ++markpos;
+          }
+          nextChange = markpos < marked.length ? marked[markpos].from : Infinity;
+          for (var i = 0; i < marks.length; ++i) {
+            var to = marks[i].to;
+            if (to == null) to = Infinity;
+            if (to == pos) marks.splice(i--, 1);
+            else nextChange = Math.min(to, nextChange);
+          }
+        }
+        var m = 0;
+        while (pos < len) {
+          if (nextChange == pos) advanceMarks();
+          var upto = Math.min(len, nextChange);
+          while (true) {
+            if (text) {
+              var end = pos + text.length;
+              var appliedStyle = style;
+              for (var j = 0; j < marks.length; ++j)
+                appliedStyle = (appliedStyle ? appliedStyle + " " : "") + marks[j].style;
+              span(end > upto ? text.slice(0, upto - pos) : text, appliedStyle);
+              if (end >= upto) {text = text.slice(upto - pos); pos = upto; break;}
+              pos = end;
+            }
+            text = st[i++]; style = styleToClass(st[i++]);
+          }
+        }
+      }
+      return html.join("");
+    },
+    cleanUp: function() {
+      this.parent = null;
+      if (this.marked)
+        for (var i = 0, e = this.marked.length; i < e; ++i) this.marked[i].detach(this);
+    }
+  };
+  // Utility used by replace and split above
+  function copyStyles(from, to, source, dest) {
+    for (var i = 0, pos = 0, state = 0; pos < to; i+=2) {
+      var part = source[i], end = pos + part.length;
+      if (state == 0) {
+        if (end > from) dest.push(part.slice(from - pos, Math.min(part.length, to - pos)), source[i+1]);
+        if (end >= from) state = 1;
+      } else if (state == 1) {
+        if (end > to) dest.push(part.slice(0, to - pos), source[i+1]);
+        else dest.push(part, source[i+1]);
+      }
+      pos = end;
+    }
+  }
+
+  // Data structure that holds the sequence of lines.
+  function LeafChunk(lines) {
+    this.lines = lines;
+    this.parent = null;
+    for (var i = 0, e = lines.length, height = 0; i < e; ++i) {
+      lines[i].parent = this;
+      height += lines[i].height;
+    }
+    this.height = height;
+  }
+  LeafChunk.prototype = {
+    chunkSize: function() { return this.lines.length; },
+    remove: function(at, n, callbacks) {
+      for (var i = at, e = at + n; i < e; ++i) {
+        var line = this.lines[i];
+        this.height -= line.height;
+        line.cleanUp();
+        if (line.handlers)
+          for (var j = 0; j < line.handlers.length; ++j) callbacks.push(line.handlers[j]);
+      }
+      this.lines.splice(at, n);
+    },
+    collapse: function(lines) {
+      lines.splice.apply(lines, [lines.length, 0].concat(this.lines));
+    },
+    insertHeight: function(at, lines, height) {
+      this.height += height;
+      this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
+      for (var i = 0, e = lines.length; i < e; ++i) lines[i].parent = this;
+    },
+    iterN: function(at, n, op) {
+      for (var e = at + n; at < e; ++at)
+        if (op(this.lines[at])) return true;
+    }
+  };
+  function BranchChunk(children) {
+    this.children = children;
+    var size = 0, height = 0;
+    for (var i = 0, e = children.length; i < e; ++i) {
+      var ch = children[i];
+      size += ch.chunkSize(); height += ch.height;
+      ch.parent = this;
+    }
+    this.size = size;
+    this.height = height;
+    this.parent = null;
+  }
+  BranchChunk.prototype = {
+    chunkSize: function() { return this.size; },
+    remove: function(at, n, callbacks) {
+      this.size -= n;
+      for (var i = 0; i < this.children.length; ++i) {
+        var child = this.children[i], sz = child.chunkSize();
+        if (at < sz) {
+          var rm = Math.min(n, sz - at), oldHeight = child.height;
+          child.remove(at, rm, callbacks);
+          this.height -= oldHeight - child.height;
+          if (sz == rm) { this.children.splice(i--, 1); child.parent = null; }
+          if ((n -= rm) == 0) break;
+          at = 0;
+        } else at -= sz;
+      }
+      if (this.size - n < 25) {
+        var lines = [];
+        this.collapse(lines);
+        this.children = [new LeafChunk(lines)];
+        this.children[0].parent = this;
+      }
+    },
+    collapse: function(lines) {
+      for (var i = 0, e = this.children.length; i < e; ++i) this.children[i].collapse(lines);
+    },
+    insert: function(at, lines) {
+      var height = 0;
+      for (var i = 0, e = lines.length; i < e; ++i) height += lines[i].height;
+      this.insertHeight(at, lines, height);
+    },
+    insertHeight: function(at, lines, height) {
+      this.size += lines.length;
+      this.height += height;
+      for (var i = 0, e = this.children.length; i < e; ++i) {
+        var child = this.children[i], sz = child.chunkSize();
+        if (at <= sz) {
+          child.insertHeight(at, lines, height);
+          if (child.lines && child.lines.length > 50) {
+            while (child.lines.length > 50) {
+              var spilled = child.lines.splice(child.lines.length - 25, 25);
+              var newleaf = new LeafChunk(spilled);
+              child.height -= newleaf.height;
+              this.children.splice(i + 1, 0, newleaf);
+              newleaf.parent = this;
+            }
+            this.maybeSpill();
+          }
+          break;
+        }
+        at -= sz;
+      }
+    },
+    maybeSpill: function() {
+      if (this.children.length <= 10) return;
+      var me = this;
+      do {
+        var spilled = me.children.splice(me.children.length - 5, 5);
+        var sibling = new BranchChunk(spilled);
+        if (!me.parent) { // Become the parent node
+          var copy = new BranchChunk(me.children);
+          copy.parent = me;
+          me.children = [copy, sibling];
+          me = copy;
+        } else {
+          me.size -= sibling.size;
+          me.height -= sibling.height;
+          var myIndex = indexOf(me.parent.children, me);
+          me.parent.children.splice(myIndex + 1, 0, sibling);
+        }
+        sibling.parent = me.parent;
+      } while (me.children.length > 10);
+      me.parent.maybeSpill();
+    },
+    iter: function(from, to, op) { this.iterN(from, to - from, op); },
+    iterN: function(at, n, op) {
+      for (var i = 0, e = this.children.length; i < e; ++i) {
+        var child = this.children[i], sz = child.chunkSize();
+        if (at < sz) {
+          var used = Math.min(n, sz - at);
+          if (child.iterN(at, used, op)) return true;
+          if ((n -= used) == 0) break;
+          at = 0;
+        } else at -= sz;
+      }
+    }
+  };
+
+  function getLineAt(chunk, n) {
+    while (!chunk.lines) {
+      for (var i = 0;; ++i) {
+        var child = chunk.children[i], sz = child.chunkSize();
+        if (n < sz) { chunk = child; break; }
+        n -= sz;
+      }
+    }
+    return chunk.lines[n];
+  }
+  function lineNo(line) {
+    if (line.parent == null) return null;
+    var cur = line.parent, no = indexOf(cur.lines, line);
+    for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
+      for (var i = 0, e = chunk.children.length; ; ++i) {
+        if (chunk.children[i] == cur) break;
+        no += chunk.children[i].chunkSize();
+      }
+    }
+    return no;
+  }
+  function lineAtHeight(chunk, h) {
+    var n = 0;
+    outer: do {
+      for (var i = 0, e = chunk.children.length; i < e; ++i) {
+        var child = chunk.children[i], ch = child.height;
+        if (h < ch) { chunk = child; continue outer; }
+        h -= ch;
+        n += child.chunkSize();
+      }
+      return n;
+    } while (!chunk.lines);
+    for (var i = 0, e = chunk.lines.length; i < e; ++i) {
+      var line = chunk.lines[i], lh = line.height;
+      if (h < lh) break;
+      h -= lh;
+    }
+    return n + i;
+  }
+  function heightAtLine(chunk, n) {
+    var h = 0;
+    outer: do {
+      for (var i = 0, e = chunk.children.length; i < e; ++i) {
+        var child = chunk.children[i], sz = child.chunkSize();
+        if (n < sz) { chunk = child; continue outer; }
+        n -= sz;
+        h += child.height;
+      }
+      return h;
+    } while (!chunk.lines);
+    for (var i = 0; i < n; ++i) h += chunk.lines[i].height;
+    return h;
+  }
+
+  // The history object 'chunks' changes that are made close together
+  // and at almost the same time into bigger undoable units.
+  function History() {
+    this.time = 0;
+    this.done = []; this.undone = [];
+    this.compound = 0;
+    this.closed = false;
+  }
+  History.prototype = {
+    addChange: function(start, added, old) {
+      this.undone.length = 0;
+      var time = +new Date, cur = this.done[this.done.length - 1], last = cur && cur[cur.length - 1];
+      var dtime = time - this.time;
+
+      if (this.compound && cur && !this.closed) {
+        cur.push({start: start, added: added, old: old});
+      } else if (dtime > 400 || !last || this.closed ||
+                 last.start > start + old.length || last.start + last.added < start) {
+        this.done.push([{start: start, added: added, old: old}]);
+        this.closed = false;
+      } else {
+        var startBefore = Math.max(0, last.start - start),
+            endAfter = Math.max(0, (start + old.length) - (last.start + last.added));
+        for (var i = startBefore; i > 0; --i) last.old.unshift(old[i - 1]);
+        for (var i = endAfter; i > 0; --i) last.old.push(old[old.length - i]);
+        if (startBefore) last.start = start;
+        last.added += added - (old.length - startBefore - endAfter);
+      }
+      this.time = time;
+    },
+    startCompound: function() {
+      if (!this.compound++) this.closed = true;
+    },
+    endCompound: function() {
+      if (!--this.compound) this.closed = true;
+    }
+  };
+
+  function stopMethod() {e_stop(this);}
+  // Ensure an event has a stop method.
+  function addStop(event) {
+    if (!event.stop) event.stop = stopMethod;
+    return event;
+  }
+
+  function e_preventDefault(e) {
+    if (e.preventDefault) e.preventDefault();
+    else e.returnValue = false;
+  }
+  function e_stopPropagation(e) {
+    if (e.stopPropagation) e.stopPropagation();
+    else e.cancelBubble = true;
+  }
+  function e_stop(e) {e_preventDefault(e); e_stopPropagation(e);}
+  CodeMirror.e_stop = e_stop;
+  CodeMirror.e_preventDefault = e_preventDefault;
+  CodeMirror.e_stopPropagation = e_stopPropagation;
+
+  function e_target(e) {return e.target || e.srcElement;}
+  function e_button(e) {
+    var b = e.which;
+    if (b == null) {
+      if (e.button & 1) b = 1;
+      else if (e.button & 2) b = 3;
+      else if (e.button & 4) b = 2;
+    }
+    if (mac && e.ctrlKey && b == 1) b = 3;
+    return b;
+  }
+
+  // Allow 3rd-party code to override event properties by adding an override
+  // object to an event object.
+  function e_prop(e, prop) {
+    var overridden = e.override && e.override.hasOwnProperty(prop);
+    return overridden ? e.override[prop] : e[prop];
+  }
+
+  // Event handler registration. If disconnect is true, it'll return a
+  // function that unregisters the handler.
+  function connect(node, type, handler, disconnect) {
+    if (typeof node.addEventListener == "function") {
+      node.addEventListener(type, handler, false);
+      if (disconnect) return function() {node.removeEventListener(type, handler, false);};
+    } else {
+      var wrapHandler = function(event) {handler(event || window.event);};
+      node.attachEvent("on" + type, wrapHandler);
+      if (disconnect) return function() {node.detachEvent("on" + type, wrapHandler);};
+    }
+  }
+  CodeMirror.connect = connect;
+
+  function Delayed() {this.id = null;}
+  Delayed.prototype = {set: function(ms, f) {clearTimeout(this.id); this.id = setTimeout(f, ms);}};
+
+  var Pass = CodeMirror.Pass = {toString: function(){return "CodeMirror.Pass";}};
+
+  var gecko = /gecko\/\d{7}/i.test(navigator.userAgent);
+  var ie = /MSIE \d/.test(navigator.userAgent);
+  var ie_lt8 = /MSIE [1-7]\b/.test(navigator.userAgent);
+  var ie_lt9 = /MSIE [1-8]\b/.test(navigator.userAgent);
+  var quirksMode = ie && document.documentMode == 5;
+  var webkit = /WebKit\//.test(navigator.userAgent);
+  var chrome = /Chrome\//.test(navigator.userAgent);
+  var opera = /Opera\//.test(navigator.userAgent);
+  var safari = /Apple Computer/.test(navigator.vendor);
+  var khtml = /KHTML\//.test(navigator.userAgent);
+  var mac_geLion = /Mac OS X 10\D([7-9]|\d\d)\D/.test(navigator.userAgent);
+
+  // Detect drag-and-drop
+  var dragAndDrop = function() {
+    // There is *some* kind of drag-and-drop support in IE6-8, but I
+    // couldn't get it to work yet.
+    if (ie_lt9) return false;
+    var div = document.createElement('div');
+    return "draggable" in div || "dragDrop" in div;
+  }();
+
+  // Feature-detect whether newlines in textareas are converted to \r\n
+  var lineSep = function () {
+    var te = document.createElement("textarea");
+    te.value = "foo\nbar";
+    if (te.value.indexOf("\r") > -1) return "\r\n";
+    return "\n";
+  }();
+
+  // For a reason I have yet to figure out, some browsers disallow
+  // word wrapping between certain characters *only* if a new inline
+  // element is started between them. This makes it hard to reliably
+  // measure the position of things, since that requires inserting an
+  // extra span. This terribly fragile set of regexps matches the
+  // character combinations that suffer from this phenomenon on the
+  // various browsers.
+  var spanAffectsWrapping = /^$/; // Won't match any two-character string
+  if (gecko) spanAffectsWrapping = /$'/;
+  else if (safari) spanAffectsWrapping = /\-[^ \-?]|\?[^ !'\"\),.\-\/:;\?\]\}]/;
+  else if (chrome) spanAffectsWrapping = /\-[^ \-\.?]|\?[^ \-\.?\]\}:;!'\"\),\/]|[\.!\"#&%\)*+,:;=>\]|\}~][\(\{\[<]|\$'/;
+
+  // Counts the column offset in a string, taking tabs into account.
+  // Used mostly to find indentation.
+  function countColumn(string, end, tabSize) {
+    if (end == null) {
+      end = string.search(/[^\s\u00a0]/);
+      if (end == -1) end = string.length;
+    }
+    for (var i = 0, n = 0; i < end; ++i) {
+      if (string.charAt(i) == "\t") n += tabSize - (n % tabSize);
+      else ++n;
+    }
+    return n;
+  }
+
+  function computedStyle(elt) {
+    if (elt.currentStyle) return elt.currentStyle;
+    return window.getComputedStyle(elt, null);
+  }
+
+  function eltOffset(node, screen) {
+    // Take the parts of bounding client rect that we are interested in so we are able to edit if need be,
+    // since the returned value cannot be changed externally (they are kept in sync as the element moves within the page)
+    try { var box = node.getBoundingClientRect(); box = { top: box.top, left: box.left }; }
+    catch(e) { box = {top: 0, left: 0}; }
+    if (!screen) {
+      // Get the toplevel scroll, working around browser differences.
+      if (window.pageYOffset == null) {
+        var t = document.documentElement || document.body.parentNode;
+        if (t.scrollTop == null) t = document.body;
+        box.top += t.scrollTop; box.left += t.scrollLeft;
+      } else {
+        box.top += window.pageYOffset; box.left += window.pageXOffset;
+      }
+    }
+    return box;
+  }
+
+  // Get a node's text content.
+  function eltText(node) {
+    return node.textContent || node.innerText || node.nodeValue || "";
+  }
+  function selectInput(node) {
+    if (ios) { // Mobile Safari apparently has a bug where select() is broken.
+      node.selectionStart = 0;
+      node.selectionEnd = node.value.length;
+    } else node.select();
+  }
+
+  // Operations on {line, ch} objects.
+  function posEq(a, b) {return a.line == b.line && a.ch == b.ch;}
+  function posLess(a, b) {return a.line < b.line || (a.line == b.line && a.ch < b.ch);}
+  function copyPos(x) {return {line: x.line, ch: x.ch};}
+
+  var escapeElement = document.createElement("pre");
+  function htmlEscape(str) {
+    escapeElement.textContent = str;
+    return escapeElement.innerHTML;
+  }
+  // Recent (late 2011) Opera betas insert bogus newlines at the start
+  // of the textContent, so we strip those.
+  if (htmlEscape("a") == "\na") {
+    htmlEscape = function(str) {
+      escapeElement.textContent = str;
+      return escapeElement.innerHTML.slice(1);
+    };
+  // Some IEs don't preserve tabs through innerHTML
+  } else if (htmlEscape("\t") != "\t") {
+    htmlEscape = function(str) {
+      escapeElement.innerHTML = "";
+      escapeElement.appendChild(document.createTextNode(str));
+      return escapeElement.innerHTML;
+    };
+  }
+  CodeMirror.htmlEscape = htmlEscape;
+
+  // Used to position the cursor after an undo/redo by finding the
+  // last edited character.
+  function editEnd(from, to) {
+    if (!to) return 0;
+    if (!from) return to.length;
+    for (var i = from.length, j = to.length; i >= 0 && j >= 0; --i, --j)
+      if (from.charAt(i) != to.charAt(j)) break;
+    return j + 1;
+  }
+
+  function indexOf(collection, elt) {
+    if (collection.indexOf) return collection.indexOf(elt);
+    for (var i = 0, e = collection.length; i < e; ++i)
+      if (collection[i] == elt) return i;
+    return -1;
+  }
+  function isWordChar(ch) {
+    return /\w/.test(ch) || ch.toUpperCase() != ch.toLowerCase();
+  }
+
+  // See if "".split is the broken IE version, if so, provide an
+  // alternative way to split lines.
+  var splitLines = "\n\nb".split(/\n/).length != 3 ? function(string) {
+    var pos = 0, result = [], l = string.length;
+    while (pos <= l) {
+      var nl = string.indexOf("\n", pos);
+      if (nl == -1) nl = string.length;
+      var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);
+      var rt = line.indexOf("\r");
+      if (rt != -1) {
+        result.push(line.slice(0, rt));
+        pos += rt + 1;
+      } else {
+        result.push(line);
+        pos = nl + 1;
+      }
+    }
+    return result;
+  } : function(string){return string.split(/\r\n?|\n/);};
+  CodeMirror.splitLines = splitLines;
+
+  var hasSelection = window.getSelection ? function(te) {
+    try { return te.selectionStart != te.selectionEnd; }
+    catch(e) { return false; }
+  } : function(te) {
+    try {var range = te.ownerDocument.selection.createRange();}
+    catch(e) {}
+    if (!range || range.parentElement() != te) return false;
+    return range.compareEndPoints("StartToEnd", range) != 0;
+  };
+
+  CodeMirror.defineMode("null", function() {
+    return {token: function(stream) {stream.skipToEnd();}};
+  });
+  CodeMirror.defineMIME("text/plain", "null");
+
+  var keyNames = {3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
+                  19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
+                  36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
+                  46: "Delete", 59: ";", 91: "Mod", 92: "Mod", 93: "Mod", 109: "-", 107: "=", 127: "Delete",
+                  186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
+                  221: "]", 222: "'", 63276: "PageUp", 63277: "PageDown", 63275: "End", 63273: "Home",
+                  63234: "Left", 63232: "Up", 63235: "Right", 63233: "Down", 63302: "Insert", 63272: "Delete"};
+  CodeMirror.keyNames = keyNames;
+  (function() {
+    // Number keys
+    for (var i = 0; i < 10; i++) keyNames[i + 48] = String(i);
+    // Alphabetic keys
+    for (var i = 65; i <= 90; i++) keyNames[i] = String.fromCharCode(i);
+    // Function keys
+    for (var i = 1; i <= 12; i++) keyNames[i + 111] = keyNames[i + 63235] = "F" + i;
+  })();
+
+  return CodeMirror;
+})();
diff --git a/PyTutorGAE/js/codemirror/python.js b/PyTutorGAE/js/codemirror/python.js
new file mode 100644
index 000000000..d6888e8e5
--- /dev/null
+++ b/PyTutorGAE/js/codemirror/python.js
@@ -0,0 +1,338 @@
+CodeMirror.defineMode("python", function(conf, parserConf) {
+    var ERRORCLASS = 'error';
+    
+    function wordRegexp(words) {
+        return new RegExp("^((" + words.join(")|(") + "))\\b");
+    }
+    
+    var singleOperators = new RegExp("^[\\+\\-\\*/%&|\\^~<>!]");
+    var singleDelimiters = new RegExp('^[\\(\\)\\[\\]\\{\\}@,:`=;\\.]');
+    var doubleOperators = new RegExp("^((==)|(!=)|(<=)|(>=)|(<>)|(<<)|(>>)|(//)|(\\*\\*))");
+    var doubleDelimiters = new RegExp("^((\\+=)|(\\-=)|(\\*=)|(%=)|(/=)|(&=)|(\\|=)|(\\^=))");
+    var tripleDelimiters = new RegExp("^((//=)|(>>=)|(<<=)|(\\*\\*=))");
+    var identifiers = new RegExp("^[_A-Za-z][_A-Za-z0-9]*");
+
+    var wordOperators = wordRegexp(['and', 'or', 'not', 'is', 'in']);
+    var commonkeywords = ['as', 'assert', 'break', 'class', 'continue',
+                          'def', 'del', 'elif', 'else', 'except', 'finally',
+                          'for', 'from', 'global', 'if', 'import',
+                          'lambda', 'pass', 'raise', 'return',
+                          'try', 'while', 'with', 'yield'];
+    var commonBuiltins = ['abs', 'all', 'any', 'bin', 'bool', 'bytearray', 'callable', 'chr',
+                          'classmethod', 'compile', 'complex', 'delattr', 'dict', 'dir', 'divmod',
+                          'enumerate', 'eval', 'filter', 'float', 'format', 'frozenset',
+                          'getattr', 'globals', 'hasattr', 'hash', 'help', 'hex', 'id',
+                          'input', 'int', 'isinstance', 'issubclass', 'iter', 'len',
+                          'list', 'locals', 'map', 'max', 'memoryview', 'min', 'next',
+                          'object', 'oct', 'open', 'ord', 'pow', 'property', 'range',
+                          'repr', 'reversed', 'round', 'set', 'setattr', 'slice',
+                          'sorted', 'staticmethod', 'str', 'sum', 'super', 'tuple',
+                          'type', 'vars', 'zip', '__import__', 'NotImplemented',
+                          'Ellipsis', '__debug__'];
+    var py2 = {'builtins': ['apply', 'basestring', 'buffer', 'cmp', 'coerce', 'execfile',
+                            'file', 'intern', 'long', 'raw_input', 'reduce', 'reload',
+                            'unichr', 'unicode', 'xrange', 'False', 'True', 'None'],
+               'keywords': ['exec', 'print']};
+    var py3 = {'builtins': ['ascii', 'bytes', 'exec', 'print'],
+               'keywords': ['nonlocal', 'False', 'True', 'None']};
+
+    if (!!parserConf.version && parseInt(parserConf.version, 10) === 3) {
+        commonkeywords = commonkeywords.concat(py3.keywords);
+        commonBuiltins = commonBuiltins.concat(py3.builtins);
+        var stringPrefixes = new RegExp("^(([rb]|(br))?('{3}|\"{3}|['\"]))", "i");
+    } else {
+        commonkeywords = commonkeywords.concat(py2.keywords);
+        commonBuiltins = commonBuiltins.concat(py2.builtins);
+        var stringPrefixes = new RegExp("^(([rub]|(ur)|(br))?('{3}|\"{3}|['\"]))", "i");
+    }
+    var keywords = wordRegexp(commonkeywords);
+    var builtins = wordRegexp(commonBuiltins);
+
+    var indentInfo = null;
+
+    // tokenizers
+    function tokenBase(stream, state) {
+        // Handle scope changes
+        if (stream.sol()) {
+            var scopeOffset = state.scopes[0].offset;
+            if (stream.eatSpace()) {
+                var lineOffset = stream.indentation();
+                if (lineOffset > scopeOffset) {
+                    indentInfo = 'indent';
+                } else if (lineOffset < scopeOffset) {
+                    indentInfo = 'dedent';
+                }
+                return null;
+            } else {
+                if (scopeOffset > 0) {
+                    dedent(stream, state);
+                }
+            }
+        }
+        if (stream.eatSpace()) {
+            return null;
+        }
+        
+        var ch = stream.peek();
+        
+        // Handle Comments
+        if (ch === '#') {
+            stream.skipToEnd();
+            return 'comment';
+        }
+        
+        // Handle Number Literals
+        if (stream.match(/^[0-9\.]/, false)) {
+            var floatLiteral = false;
+            // Floats
+            if (stream.match(/^\d*\.\d+(e[\+\-]?\d+)?/i)) { floatLiteral = true; }
+            if (stream.match(/^\d+\.\d*/)) { floatLiteral = true; }
+            if (stream.match(/^\.\d+/)) { floatLiteral = true; }
+            if (floatLiteral) {
+                // Float literals may be "imaginary"
+                stream.eat(/J/i);
+                return 'number';
+            }
+            // Integers
+            var intLiteral = false;
+            // Hex
+            if (stream.match(/^0x[0-9a-f]+/i)) { intLiteral = true; }
+            // Binary
+            if (stream.match(/^0b[01]+/i)) { intLiteral = true; }
+            // Octal
+            if (stream.match(/^0o[0-7]+/i)) { intLiteral = true; }
+            // Decimal
+            if (stream.match(/^[1-9]\d*(e[\+\-]?\d+)?/)) {
+                // Decimal literals may be "imaginary"
+                stream.eat(/J/i);
+                // TODO - Can you have imaginary longs?
+                intLiteral = true;
+            }
+            // Zero by itself with no other piece of number.
+            if (stream.match(/^0(?![\dx])/i)) { intLiteral = true; }
+            if (intLiteral) {
+                // Integer literals may be "long"
+                stream.eat(/L/i);
+                return 'number';
+            }
+        }
+        
+        // Handle Strings
+        if (stream.match(stringPrefixes)) {
+            state.tokenize = tokenStringFactory(stream.current());
+            return state.tokenize(stream, state);
+        }
+        
+        // Handle operators and Delimiters
+        if (stream.match(tripleDelimiters) || stream.match(doubleDelimiters)) {
+            return null;
+        }
+        if (stream.match(doubleOperators)
+            || stream.match(singleOperators)
+            || stream.match(wordOperators)) {
+            return 'operator';
+        }
+        if (stream.match(singleDelimiters)) {
+            return null;
+        }
+        
+        if (stream.match(keywords)) {
+            return 'keyword';
+        }
+        
+        if (stream.match(builtins)) {
+            return 'builtin';
+        }
+        
+        if (stream.match(identifiers)) {
+            return 'variable';
+        }
+        
+        // Handle non-detected items
+        stream.next();
+        return ERRORCLASS;
+    }
+    
+    function tokenStringFactory(delimiter) {
+        while ('rub'.indexOf(delimiter.charAt(0).toLowerCase()) >= 0) {
+            delimiter = delimiter.substr(1);
+        }
+        var singleline = delimiter.length == 1;
+        var OUTCLASS = 'string';
+        
+        return function tokenString(stream, state) {
+            while (!stream.eol()) {
+                stream.eatWhile(/[^'"\\]/);
+                if (stream.eat('\\')) {
+                    stream.next();
+                    if (singleline && stream.eol()) {
+                        return OUTCLASS;
+                    }
+                } else if (stream.match(delimiter)) {
+                    state.tokenize = tokenBase;
+                    return OUTCLASS;
+                } else {
+                    stream.eat(/['"]/);
+                }
+            }
+            if (singleline) {
+                if (parserConf.singleLineStringErrors) {
+                    return ERRORCLASS;
+                } else {
+                    state.tokenize = tokenBase;
+                }
+            }
+            return OUTCLASS;
+        };
+    }
+    
+    function indent(stream, state, type) {
+        type = type || 'py';
+        var indentUnit = 0;
+        if (type === 'py') {
+            if (state.scopes[0].type !== 'py') {
+                state.scopes[0].offset = stream.indentation();
+                return;
+            }
+            for (var i = 0; i < state.scopes.length; ++i) {
+                if (state.scopes[i].type === 'py') {
+                    indentUnit = state.scopes[i].offset + conf.indentUnit;
+                    break;
+                }
+            }
+        } else {
+            indentUnit = stream.column() + stream.current().length;
+        }
+        state.scopes.unshift({
+            offset: indentUnit,
+            type: type
+        });
+    }
+    
+    function dedent(stream, state, type) {
+        type = type || 'py';
+        if (state.scopes.length == 1) return;
+        if (state.scopes[0].type === 'py') {
+            var _indent = stream.indentation();
+            var _indent_index = -1;
+            for (var i = 0; i < state.scopes.length; ++i) {
+                if (_indent === state.scopes[i].offset) {
+                    _indent_index = i;
+                    break;
+                }
+            }
+            if (_indent_index === -1) {
+                return true;
+            }
+            while (state.scopes[0].offset !== _indent) {
+                state.scopes.shift();
+            }
+            return false
+        } else {
+            if (type === 'py') {
+                state.scopes[0].offset = stream.indentation();
+                return false;
+            } else {
+                if (state.scopes[0].type != type) {
+                    return true;
+                }
+                state.scopes.shift();
+                return false;
+            }
+        }
+    }
+
+    function tokenLexer(stream, state) {
+        indentInfo = null;
+        var style = state.tokenize(stream, state);
+        var current = stream.current();
+
+        // Handle '.' connected identifiers
+        if (current === '.') {
+            style = stream.match(identifiers, false) ? null : ERRORCLASS;
+            if (style === null && state.lastToken === 'meta') {
+                // Apply 'meta' style to '.' connected identifiers when
+                // appropriate.
+                style = 'meta';
+            }
+            return style;
+        }
+        
+        // Handle decorators
+        if (current === '@') {
+            return stream.match(identifiers, false) ? 'meta' : ERRORCLASS;
+        }
+
+        if ((style === 'variable' || style === 'builtin')
+            && state.lastToken === 'meta') {
+            style = 'meta';
+        }
+        
+        // Handle scope changes.
+        if (current === 'pass' || current === 'return') {
+            state.dedent += 1;
+        }
+        if (current === 'lambda') state.lambda = true;
+        if ((current === ':' && !state.lambda && state.scopes[0].type == 'py')
+            || indentInfo === 'indent') {
+            indent(stream, state);
+        }
+        var delimiter_index = '[({'.indexOf(current);
+        if (delimiter_index !== -1) {
+            indent(stream, state, '])}'.slice(delimiter_index, delimiter_index+1));
+        }
+        if (indentInfo === 'dedent') {
+            if (dedent(stream, state)) {
+                return ERRORCLASS;
+            }
+        }
+        delimiter_index = '])}'.indexOf(current);
+        if (delimiter_index !== -1) {
+            if (dedent(stream, state, current)) {
+                return ERRORCLASS;
+            }
+        }
+        if (state.dedent > 0 && stream.eol() && state.scopes[0].type == 'py') {
+            if (state.scopes.length > 1) state.scopes.shift();
+            state.dedent -= 1;
+        }
+        
+        return style;
+    }
+
+    var external = {
+        startState: function(basecolumn) {
+            return {
+              tokenize: tokenBase,
+              scopes: [{offset:basecolumn || 0, type:'py'}],
+              lastToken: null,
+              lambda: false,
+              dedent: 0
+          };
+        },
+        
+        token: function(stream, state) {
+            var style = tokenLexer(stream, state);
+            
+            state.lastToken = style;
+            
+            if (stream.eol() && stream.lambda) {
+                state.lambda = false;
+            }
+            
+            return style;
+        },
+        
+        indent: function(state, textAfter) {
+            if (state.tokenize != tokenBase) {
+                return 0;
+            }
+            
+            return state.scopes[0].offset;
+        }
+        
+    };
+    return external;
+});
+
+CodeMirror.defineMIME("text/x-python", "python");
diff --git a/PyTutorGAE/js/d3.v2.min.js b/PyTutorGAE/js/d3.v2.min.js
new file mode 100644
index 000000000..2a1e13110
--- /dev/null
+++ b/PyTutorGAE/js/d3.v2.min.js
@@ -0,0 +1,4 @@
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\ No newline at end of file
diff --git a/PyTutorGAE/js/edu-python-tutor.js b/PyTutorGAE/js/edu-python-tutor.js
new file mode 100644
index 000000000..3dd644b7d
--- /dev/null
+++ b/PyTutorGAE/js/edu-python-tutor.js
@@ -0,0 +1,343 @@
+/*
+
+Online Python Tutor
+https://github.com/pgbovine/OnlinePythonTutor/
+
+Copyright (C) 2010-2012 Philip J. Guo (philip@pgbovine.net)
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+*/
+
+
+// Pre-reqs: edu-python.js and jquery.ba-bbq.min.js should be imported BEFORE this file
+
+
+function enterEditMode() {
+  $.bbq.pushState({ mode: 'edit' }, 2 /* completely override other hash strings to keep URL clean */);
+}
+
+function enterVisualizeMode(traceData, inputCode) {
+  // set gross globals, then let jQuery BBQ take care of the rest
+  curTrace = traceData;
+  curInputCode = inputCode;
+
+  renderPyCodeOutput(inputCode);
+
+  $.bbq.pushState({ mode: 'visualize' }, 2 /* completely override other hash strings to keep URL clean */);
+}
+
+
+var pyInputCodeMirror; // CodeMirror object that contains the input text
+
+function setCodeMirrorVal(dat) {
+  pyInputCodeMirror.setValue(dat);
+}
+
+
+$(document).ready(function() {
+  eduPythonCommonInit(); // must call this first!
+
+  pyInputCodeMirror = CodeMirror(document.getElementById('codeInputPane'), {
+    mode: 'python',
+    lineNumbers: true,
+    tabSize: 2,
+  });
+
+  pyInputCodeMirror.setSize(null, '450px');
+
+
+
+  // be friendly to the browser's forward and back buttons
+  // thanks to http://benalman.com/projects/jquery-bbq-plugin/
+  $(window).bind("hashchange", function(e) {
+    appMode = $.bbq.getState('mode'); // assign this to the GLOBAL appMode
+
+    // globals defined in edu-python.js
+    preseededCode = $.bbq.getState('code');
+
+    if (!preseededCurInstr) { // TODO: kinda gross hack
+      preseededCurInstr = Number($.bbq.getState('curInstr'));
+    }
+
+    // default mode is 'edit'
+    if (appMode == undefined) {
+      appMode = 'edit';
+    }
+
+    // if there's no curTrace, then default to edit mode since there's
+    // nothing to visualize:
+    if (!curTrace) {
+      appMode = 'edit';
+
+      if (preseededCode) {
+        // if you've pre-seeded 'code' and 'curInstr' params in the URL hash,
+        // then punt for now ...
+      }
+      else {
+        $.bbq.pushState({ mode: 'edit' }, 2 /* completely override other hash strings to keep URL clean */);
+      }
+    }
+
+
+    if (appMode == 'edit') {
+      $("#pyInputPane").show();
+      $("#pyOutputPane").hide();
+    }
+    else if (appMode == 'visualize') {
+      $("#pyInputPane").hide();
+      $("#pyOutputPane").show();
+
+      $('#executeBtn').html("Visualize execution");
+      $('#executeBtn').attr('disabled', false);
+
+
+      // do this AFTER making #pyOutputPane visible, or else
+      // jsPlumb connectors won't render properly
+      processTrace(false);
+    }
+    else {
+      assert(false);
+    }
+  });
+
+  // From: http://benalman.com/projects/jquery-bbq-plugin/
+  //   Since the event is only triggered when the hash changes, we need
+  //   to trigger the event now, to handle the hash the page may have
+  //   loaded with.
+  $(window).trigger( "hashchange" );
+
+
+  $("#executeBtn").attr('disabled', false);
+  $("#executeBtn").click(function() {
+    $('#executeBtn').html("Please wait ... processing your code");
+    $('#executeBtn').attr('disabled', true);
+    $("#pyOutputPane").hide();
+
+    // TODO: is GET or POST best here?
+    $.get("exec",
+           {user_script : pyInputCodeMirror.getValue()},
+           function(traceData) {
+             enterVisualizeMode(traceData, pyInputCodeMirror.getValue());
+           },
+           "json");
+  });
+
+
+  $("#editBtn").click(function() {
+    enterEditMode();
+  });
+
+
+  // canned examples
+
+  $("#tutorialExampleLink").click(function() {
+    $.get("example-code/py_tutorial.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#strtokExampleLink").click(function() {
+    $.get("example-code/strtok.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#fibonacciExampleLink").click(function() {
+    $.get("example-code/fib.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#memoFibExampleLink").click(function() {
+    $.get("example-code/memo_fib.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#factExampleLink").click(function() {
+    $.get("example-code/fact.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#filterExampleLink").click(function() {
+    $.get("example-code/filter.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#insSortExampleLink").click(function() {
+    $.get("example-code/ins_sort.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#aliasExampleLink").click(function() {
+    $.get("example-code/aliasing.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#newtonExampleLink").click(function() {
+    $.get("example-code/sqrt.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#oopSmallExampleLink").click(function() {
+    $.get("example-code/oop_small.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#mapExampleLink").click(function() {
+    $.get("example-code/map.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#oop1ExampleLink").click(function() {
+    $.get("example-code/oop_1.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#oop2ExampleLink").click(function() {
+    $.get("example-code/oop_2.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#inheritanceExampleLink").click(function() {
+    $.get("example-code/oop_inherit.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#sumExampleLink").click(function() {
+    $.get("example-code/sum.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#pwGcdLink").click(function() {
+    $.get("example-code/wentworth_gcd.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#pwSumListLink").click(function() {
+    $.get("example-code/wentworth_sumList.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#towersOfHanoiLink").click(function() {
+    $.get("example-code/towers_of_hanoi.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#pwTryFinallyLink").click(function() {
+    $.get("example-code/wentworth_try_finally.txt", setCodeMirrorVal);
+    return false;
+  });
+
+
+  $('#closure1Link').click(function() {
+    $.get("example-code/closures/closure1.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#closure2Link').click(function() {
+    $.get("example-code/closures/closure2.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#closure3Link').click(function() {
+    $.get("example-code/closures/closure3.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#closure4Link').click(function() {
+    $.get("example-code/closures/closure4.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#closure5Link').click(function() {
+    $.get("example-code/closures/closure5.txt", setCodeMirrorVal);
+    return false;
+  });
+
+
+  $('#aliasing1Link').click(function() {
+    $.get("example-code/aliasing/aliasing1.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#aliasing2Link').click(function() {
+    $.get("example-code/aliasing/aliasing2.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#aliasing3Link').click(function() {
+    $.get("example-code/aliasing/aliasing3.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#aliasing4Link').click(function() {
+    $.get("example-code/aliasing/aliasing4.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#aliasing5Link').click(function() {
+    $.get("example-code/aliasing/aliasing5.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#aliasing6Link').click(function() {
+    $.get("example-code/aliasing/aliasing6.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#aliasing7Link').click(function() {
+    $.get("example-code/aliasing/aliasing7.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $('#ll1Link').click(function() {
+    $.get("example-code/linked-lists/ll1.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#ll2Link').click(function() {
+    $.get("example-code/linked-lists/ll2.txt", setCodeMirrorVal);
+    return false;
+  });
+
+
+  if (preseededCode) {
+    setCodeMirrorVal(preseededCode);
+
+    if ($.bbq.getState('mode') != 'edit') {
+      $("#executeBtn").trigger('click');
+    }
+  }
+  else {
+    // select a canned example on start-up:
+    $("#aliasExampleLink").trigger('click');
+  }
+
+
+  // TODO: refactor so that it applies to edu-python-questions.js as well ...
+
+  $('#executionSlider').bind('slide', function(evt, ui) {
+    // this is SUPER subtle. if this value was changed programmatically,
+    // then evt.originalEvent will be undefined. however, if this value
+    // was changed by a user-initiated event, then this code should be
+    // executed ...
+    if (evt.originalEvent) {
+      curInstr = ui.value;
+      updateOutput(true); // need to pass 'true' here to prevent infinite loop
+    }
+  });
+
+
+  $('#genUrlBtn').bind('click', function() {
+    // override mode with 'visualize' ...
+    var urlStr = jQuery.param.fragment(window.location.href, {code: curInputCode, curInstr: curInstr}, 2);
+
+    $('#urlOutput').val(urlStr);
+  });
+
+});
+
diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
new file mode 100644
index 000000000..c719544fd
--- /dev/null
+++ b/PyTutorGAE/js/edu-python.js
@@ -0,0 +1,2534 @@
+/*
+
+Online Python Tutor
+https://github.com/pgbovine/OnlinePythonTutor/
+
+Copyright (C) 2010-2012 Philip J. Guo (philip@pgbovine.net)
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+*/
+
+
+// TODO: look into using the d3.map class instead of direct object operations in js,
+// since the latter might exhibit funny behavior for certain reserved keywords
+
+
+// code that is common to all Online Python Tutor pages
+
+var appMode = 'edit'; // 'edit', 'visualize', or 'grade' (only for question.html)
+
+
+/* colors - see edu-python.css */
+var lightYellow = '#F5F798';
+var lightLineColor = '#FFFFCC';
+var errorColor = '#F87D76';
+var visitedLineColor = '#3D58A2';
+
+var lightGray = "#cccccc";
+//var lightGray = "#dddddd";
+var darkBlue = "#3D58A2";
+var lightBlue = "#899CD1";
+var pinkish = "#F15149";
+var lightPink = "#F89D99";
+var darkRed = "#9D1E18";
+
+var breakpointColor = pinkish;
+
+
+var keyStuckDown = false;
+
+
+// ugh globals! should really refactor into a "current state" object or
+// something like that ...
+var curTrace = null;
+var curInputCode = null;
+var curInstr = 0;
+
+var preseededCode = null;     // if you passed in a 'code=' in the URL, then set this var
+var preseededCurInstr = null; // if you passed in a 'curInstr=' in the URL, then set this var
+
+
+// an array of objects with the following fields:
+//   'text' - the text of the line of code
+//   'lineNumber' - one-indexed (always the array index + 1)
+//   'executionPoints' - an ordered array of zero-indexed execution points where this line was executed
+//   'backgroundColor' - current code output line background color
+//   'breakpointHere' - has a breakpoint been set here?
+var codeOutputLines = [];
+
+var visitedLinesSet = {} // YUCKY GLOBAL!
+
+
+
+// true iff trace ended prematurely since maximum instruction limit has
+// been reached
+var instrLimitReached = false;
+
+function assert(cond) {
+  if (!cond) {
+    alert("Error: ASSERTION FAILED");
+  }
+}
+
+// taken from http://www.toao.net/32-my-htmlspecialchars-function-for-javascript
+function htmlspecialchars(str) {
+  if (typeof(str) == "string") {
+    str = str.replace(/&/g, "&"); /* must do & first */
+
+    // ignore these for now ...
+    //str = str.replace(/"/g, """);
+    //str = str.replace(/'/g, "'");
+
+    str = str.replace(//g, ">");
+
+    // replace spaces:
+    str = str.replace(/ /g, " ");
+  }
+  return str;
+}
+
+function processTrace(jumpToEnd) {
+  curInstr = 0;
+
+  // only do this at most ONCE, and then clear out preseededCurInstr
+  if (preseededCurInstr && preseededCurInstr < curTrace.length) { // NOP anyways if preseededCurInstr is 0
+    curInstr = preseededCurInstr;
+    preseededCurInstr = null;
+  }
+
+  // delete all stale output
+  $("#pyStdout").val('');
+
+  if (curTrace.length > 0) {
+    var lastEntry = curTrace[curTrace.length - 1];
+
+    // GLOBAL!
+    instrLimitReached = (lastEntry.event == 'instruction_limit_reached');
+
+    if (instrLimitReached) {
+      curTrace.pop() // kill last entry
+      var warningMsg = lastEntry.exception_msg;
+      $("#errorOutput").html(htmlspecialchars(warningMsg));
+      $("#errorOutput").show();
+    }
+    // as imran suggests, for a (non-error) one-liner, SNIP off the
+    // first instruction so that we start after the FIRST instruction
+    // has been executed ...
+    else if (curTrace.length == 2) {
+      curTrace.shift();
+    }
+
+
+    if (jumpToEnd) {
+      // if there's an exception, then jump to the FIRST occurrence of
+      // that exception.  otherwise, jump to the very end of execution.
+      curInstr = curTrace.length - 1;
+
+      for (var i = 0; i < curTrace.length; i++) {
+        var curEntry = curTrace[i];
+        if (curEntry.event == 'exception' ||
+            curEntry.event == 'uncaught_exception') {
+          curInstr = i;
+          break;
+        }
+      }
+    }
+
+  }
+
+
+  // remove any existing sliders
+  $('#executionSlider').slider('destroy');
+  $('#executionSlider').empty();
+
+  $('#executionSlider').slider({
+    min: 0,
+    max: curTrace.length - 1,
+    step: 1
+
+  });
+
+  //disable keyboard actions on the slider itself (to prevent double-firing of events)
+  $("#executionSlider .ui-slider-handle").unbind('keydown');
+  // make skinnier and taller
+  $("#executionSlider .ui-slider-handle").css('width', '0.8em');
+  $("#executionSlider .ui-slider-handle").css('height', '1.4em');
+
+  $(".ui-widget-content").css('font-size', '0.9em');
+ 
+  updateOutput();
+}
+
+function highlightCodeLine(curLine, hasError, isTerminated) {
+  d3.selectAll('#pyCodeOutputDiv td.lineNo')
+    .attr('id', function(d) {return 'lineNo' + d.lineNumber;})
+    .style('color', function(d)
+      {return d.breakpointHere ? breakpointColor : (visitedLinesSet[d.lineNumber] ? visitedLineColor : null);})
+    .style('font-weight', function(d)
+      {return d.breakpointHere ? 'bold' : (visitedLinesSet[d.lineNumber] ? 'bold' : null);});
+
+  d3.selectAll('#pyCodeOutputDiv td.cod')
+    .style('background-color', function(d) {
+      if (d.lineNumber == curLine) {
+        if (hasError) {
+          d.backgroundColor = errorColor;
+        }
+        else if (isTerminated) {
+          d.backgroundColor = lightBlue;
+        }
+        else {
+          d.backgroundColor = lightLineColor;
+        }
+      }
+      else {
+        d.backgroundColor = null;
+      }
+
+      return d.backgroundColor;
+    })
+    .style('border-top', function(d) {
+      if ((d.lineNumber == curLine) && !hasError && !isTerminated) {
+        return '1px solid #F87D76';
+      }
+      else {
+        // put a default white top border to keep space usage consistent
+        return '1px solid #ffffff';
+      }
+    });
+
+  // smoothly scroll code display
+  if (!isOutputLineVisible(curLine)) {
+    scrollCodeOutputToLine(curLine);
+  }
+}
+
+
+// smoothly scroll pyCodeOutputDiv so that the given line is at the center
+function scrollCodeOutputToLine(lineNo) {
+  var lineNoTd = $('#lineNo' + lineNo);
+  var LO = lineNoTd.offset().top;
+
+  var codeOutputDiv = $('#pyCodeOutputDiv');
+  var PO = codeOutputDiv.offset().top;
+  var ST = codeOutputDiv.scrollTop();
+  var H = codeOutputDiv.height();
+
+  codeOutputDiv.animate({scrollTop: (ST + (LO - PO - (Math.round(H / 2))))}, 300);
+}
+
+
+// returns True iff lineNo is visible in pyCodeOutputDiv
+function isOutputLineVisible(lineNo) {
+  var lineNoTd = $('#lineNo' + lineNo);
+  var LO = lineNoTd.offset().top;
+
+  var codeOutputDiv = $('#pyCodeOutputDiv');
+  var PO = codeOutputDiv.offset().top;
+  var ST = codeOutputDiv.scrollTop();
+  var H = codeOutputDiv.height();
+
+  // add a few pixels of fudge factor on the bottom end due to bottom scrollbar
+  return (PO <= LO) && (LO < (PO + H - 15));
+}
+
+
+
+// relies on curTrace and curInstr globals
+function updateOutput() {
+  if (!curTrace) {
+    return;
+  }
+
+  $('#urlOutput').val(''); // blank out
+
+  var curEntry = curTrace[curInstr];
+  var hasError = false;
+
+  // render VCR controls:
+  var totalInstrs = curTrace.length;
+
+  // to be user-friendly, if we're on the LAST instruction, print "Program has terminated"
+  // and DON'T highlight any lines of code in the code display
+  if (curInstr == (totalInstrs-1)) {
+    if (instrLimitReached) {
+      $("#vcrControls #curInstr").html("Instruction limit reached");
+    }
+    else {
+      $("#vcrControls #curInstr").html("Program has terminated");
+    }
+  }
+  else {
+    $("#vcrControls #curInstr").html("About to run step " + (curInstr + 1) + " of " + (totalInstrs-1));
+  }
+
+
+  // PROGRAMMATICALLY change the value, so evt.originalEvent should be undefined
+  $('#executionSlider').slider('value', curInstr);
+
+
+  // render error (if applicable):
+  if (curEntry.event == 'exception' ||
+      curEntry.event == 'uncaught_exception') {
+    assert(curEntry.exception_msg);
+
+    if (curEntry.exception_msg == "Unknown error") {
+      $("#errorOutput").html('Unknown error: Please email a bug report to philip@pgbovine.net');
+    }
+    else {
+      $("#errorOutput").html(htmlspecialchars(curEntry.exception_msg));
+    }
+
+    $("#errorOutput").show();
+
+    hasError = true;
+  }
+  else {
+    if (!instrLimitReached) { // ugly, I know :/
+      $("#errorOutput").hide();
+    }
+  }
+
+
+  // render code output:
+  if (curEntry.line) {
+    // calculate all lines that have been 'visited' 
+    // by execution up to (but NOT INCLUDING) curInstr:
+    visitedLinesSet = {} // GLOBAL!
+    for (var i = 0; i < curInstr; i++) {
+      if (curTrace[i].line) {
+        visitedLinesSet[curTrace[i].line] = true;
+      }
+    }
+
+    highlightCodeLine(curEntry.line, hasError,
+                      /* if instrLimitReached, then treat like a normal non-terminating line */
+                      (!instrLimitReached && (curInstr == (totalInstrs-1))));
+  }
+
+
+  // render stdout:
+
+  // keep original horizontal scroll level:
+  var oldLeft = $("#pyStdout").scrollLeft();
+  $("#pyStdout").val(curEntry.stdout);
+
+  $("#pyStdout").scrollLeft(oldLeft);
+  // scroll to bottom, though:
+  $("#pyStdout").scrollTop($("#pyStdout")[0].scrollHeight);
+
+
+  // finally, render all the data structures!!!
+  renderDataStructures(curEntry, "#dataViz");
+}
+
+
+// make sure varname doesn't contain any weird
+// characters that are illegal for CSS ID's ...
+//
+// I know for a fact that iterator tmp variables named '_[1]'
+// are NOT legal names for CSS ID's.
+// I also threw in '{', '}', '(', ')', '<', '>' as illegal characters.
+//
+// TODO: what other characters are illegal???
+var lbRE = new RegExp('\\[|{|\\(|<', 'g');
+var rbRE = new RegExp('\\]|}|\\)|>', 'g');
+function varnameToCssID(varname) {
+  return varname.replace(lbRE, 'LeftB_').replace(rbRE, '_RightB');
+}
+
+
+// compare two JSON-encoded compound objects for structural equivalence:
+function structurallyEquivalent(obj1, obj2) {
+  // punt if either isn't a compound type
+  if (isPrimitiveType(obj1) || isPrimitiveType(obj2)) {
+    return false;
+  }
+
+  // must be the same compound type
+  if (obj1[0] != obj2[0]) {
+    return false;
+  }
+
+  // must have the same number of elements or fields
+  if (obj1.length != obj2.length) {
+    return false;
+  }
+
+  // for a list or tuple, same size (e.g., a cons cell is a list/tuple of size 2)
+  if (obj1[0] == 'LIST' || obj1[0] == 'TUPLE') {
+    return true;
+  }
+  else {
+    var startingInd = -1;
+
+    if (obj1[0] == 'DICT') {
+      startingInd = 2;
+    }
+    else if (obj1[0] == 'INSTANCE') {
+      startingInd = 3;
+    }
+    else {
+      return false;
+    }
+
+    var obj1fields = {};
+
+    // for a dict or object instance, same names of fields (ordering doesn't matter)
+    for (var i = startingInd; i < obj1.length; i++) {
+      obj1fields[obj1[i][0]] = 1; // use as a set
+    }
+
+    for (var i = startingInd; i < obj2.length; i++) {
+      if (obj1fields[obj2[i][0]] == undefined) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+}
+
+
+
+// Renders the current trace entry (curEntry) into the div named by vizDiv
+//
+// The "3.0" version of renderDataStructures renders variables in
+// a stack, values in a separate heap, and draws line connectors
+// to represent both stack->heap object references and, more importantly,
+// heap->heap references. This version was created in August 2012.
+//
+// The "2.0" version of renderDataStructures renders variables in
+// a stack and values in a separate heap, with data structure aliasing
+// explicitly represented via line connectors (thanks to jsPlumb lib).
+// This version was created in September 2011.
+//
+// The ORIGINAL "1.0" version of renderDataStructures
+// was created in January 2010 and rendered variables and values
+// INLINE within each stack frame without any explicit representation
+// of data structure aliasing. That is, aliased objects were rendered
+// multiple times, and a unique ID label was used to identify aliases.
+function renderDataStructures(curEntry, vizDiv) {
+
+  // VERY VERY IMPORTANT --- and reset ALL jsPlumb state to prevent
+  // weird mis-behavior!!!
+  jsPlumb.reset();
+
+  $(vizDiv).empty(); // jQuery empty() is better than .html('')
+
+
+  // create a tabular layout for stack and heap side-by-side
+  // TODO: figure out how to do this using CSS in a robust way!
+  $(vizDiv).html('
');
+
+  $(vizDiv + " #stack").append('
Frames
');
+
+
+  // merge zombie_stack_locals and stack_locals into one master
+  // ordered list using some simple rules for aesthetics
+  var stack_to_render = [];
+
+  // first push all regular stack entries backwards
+  if (curEntry.stack_locals) {
+    for (var i = curEntry.stack_locals.length - 1; i >= 0; i--) {
+      var entry = curEntry.stack_locals[i];
+      entry.is_zombie = false;
+      entry.is_highlighted = (i == 0);
+      stack_to_render.push(entry);
+    }
+  }
+
+  // zombie stack consists of exited functions that have returned nested functions
+  // push zombie stack entries at the BEGINNING of stack_to_render,
+  // EXCEPT put zombie entries BEHIND regular entries that are their parents
+  if (curEntry.zombie_stack_locals) {
+
+    for (var i = curEntry.zombie_stack_locals.length - 1; i >= 0; i--) {
+      var entry = curEntry.zombie_stack_locals[i];
+      entry.is_zombie = true;
+      entry.is_highlighted = false; // never highlight zombie entries
+
+      // j should be 0 most of the time, so we're always inserting new
+      // elements to the front of stack_to_render (which is why we are
+      // iterating backwards over zombie_stack_locals).
+      var j = 0;
+      for (j = 0; j < stack_to_render.length; j++) {
+        if ($.inArray(stack_to_render[j].frame_id, entry.parent_frame_id_list) >= 0) {
+          continue;
+        }
+        break;
+      }
+
+      stack_to_render.splice(j, 0, entry);
+    }
+
+  }
+
+
+  // first build up a list of lists representing the locations of TOP-LEVEL heap objects to be rendered.
+  // doing so decouples the data format of curEntry from the nitty-gritty HTML rendering code,
+  // which gives us more flexibility in experimenting with layout strategies.
+  //
+  // each outer list represents a "row" in the heap layout (represented via, say, div elements)
+  // and each inner list represents "columns" within a row (represented via, say, table td elements)
+  var toplevelHeapLayout = [];
+  var toplevelHeapLayoutIDs = {}; // set of IDs contained within toplevelHeapLayout
+  var alreadyLaidObjectIDs = {};  // set of IDs of objects that have already been laid out
+                                  // (not necessarily just in toplevelHeapLayout since some elements
+                                  //  are EMBEDDED within other heap objects)
+
+
+  function layoutHeapObject(ref) {
+
+    function layoutHeapObjectHelper(id, row /* list of IDs */, isTopLevel) {
+      if (alreadyLaidObjectIDs[id] == undefined) {
+
+        // Only push to row if isTopLevel since it only stores top-level objects ...
+        if (isTopLevel) {
+          row.push(id);
+        }
+
+        // but ALWAYS record that this object has already been laid out, no matter what 
+        alreadyLaidObjectIDs[id] = 1;
+
+        // heuristic for laying out 1-D linked data structures: check for enclosing elements that are
+        // structurally identical and then lay them out as siblings in the same "row"
+        var heapObj = curEntry.heap[id];
+        assert(heapObj);
+
+        if (heapObj[0] == 'LIST' || heapObj[0] == 'TUPLE') {
+          jQuery.each(heapObj, function(ind, child) {
+            if (ind < 1) return; // skip type tag
+
+            if (!isPrimitiveType(child)) {
+              var childID = getRefID(child);
+              if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
+                layoutHeapObjectHelper(childID, row, true);
+              }
+              else {
+                layoutHeapObjectHelper(childID, null, false /* render embedded within heapObj */);
+              }
+            }
+          });
+        }
+        else if (heapObj[0] == 'SET') {
+          jQuery.each(heapObj, function(ind, child) {
+            if (ind < 1) return; // skip type tag
+            if (!isPrimitiveType(child)) {
+              layoutHeapObjectHelper(getRefID(child), null, false /* render embedded within heapObj */);
+            }
+          });
+        }
+        else if (heapObj[0] == 'DICT') {
+          jQuery.each(heapObj, function(ind, child) {
+            if (ind < 1) return; // skip type tag
+
+            var dictKey = child[0];
+            if (!isPrimitiveType(dictKey)) {
+              layoutHeapObjectHelper(getRefID(dictKey), null, false /* render embedded within heapObj */);
+            }
+
+            var dictVal = child[1];
+            if (!isPrimitiveType(dictVal)) {
+              var childID = getRefID(dictVal);
+              if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
+                layoutHeapObjectHelper(childID, row, true);
+              }
+              else {
+                layoutHeapObjectHelper(childID, null, false /* render embedded within heapObj */);
+              }
+            }
+          });
+        }
+        else if (heapObj[0] == 'INSTANCE') {
+          jQuery.each(heapObj, function(ind, child) {
+            if (ind < 2) return; // skip type tag and class name
+
+            // instance keys are always strings, so no need to recurse
+            assert(typeof child[0] == "string");
+
+            var instVal = child[1];
+            if (!isPrimitiveType(instVal)) {
+              var childID = getRefID(instVal);
+              if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
+                layoutHeapObjectHelper(childID, row, true);
+              }
+              else {
+                layoutHeapObjectHelper(childID, null, false /* render embedded within heapObj */);
+              }
+            }
+          });
+        }
+        else if (heapObj[0] == 'CLASS') {
+          jQuery.each(heapObj, function(ind, child) {
+            if (ind < 3) return; // skip type tag, class name, and superclass names
+            // class attr keys are always strings, so no need to recurse
+
+            var classAttrVal = child[1];
+            if (!isPrimitiveType(classAttrVal)) {
+              layoutHeapObjectHelper(getRefID(classAttrVal), null, false /* render embedded within heapObj */);
+            }
+          });
+        }
+      }
+    }
+
+    var id = getRefID(ref);
+    var newRow = [];
+
+    layoutHeapObjectHelper(id, newRow, true);
+    if (newRow.length > 0) {
+      toplevelHeapLayout.push(newRow);
+      $.each(newRow, function(i, e) {
+        toplevelHeapLayoutIDs[e] = 1;
+      });
+    }
+  }
+
+
+  // variables are displayed in the following order, so lay out heap objects in the same order:
+  //   - globals
+  //   - stack entries (regular and zombies)
+  $.each(curEntry.ordered_globals, function(i, varname) {
+    var val = curEntry.globals[varname];
+    // (use '!==' to do an EXACT match against undefined)
+    if (val !== undefined) { // might not be defined at this line, which is OKAY!
+      if (!isPrimitiveType(val)) {
+        layoutHeapObject(val);
+        console.log('global:', varname, getRefID(val));
+      }
+    }
+  });
+
+  $.each(stack_to_render, function(i, frame) {
+    if (frame.ordered_varnames.length > 0) {
+      $.each(frame.ordered_varnames, function(xxx, varname) {
+        var val = frame.encoded_locals[varname];
+
+        // ignore return values for zombie frames
+        if (frame.is_zombie && varname == '__return__') {
+          return;
+        }
+
+        if (!isPrimitiveType(val)) {
+          layoutHeapObject(val);
+          console.log(frame.func_name + ':', varname, getRefID(val));
+        }
+      });
+    }
+  });
+
+
+  // print toplevelHeapLayout
+  $.each(toplevelHeapLayout, function(i, elt) {
+    console.log(elt);
+  });
+  console.log('---');
+
+
+  var renderedObjectIDs = {}; // set (TODO: refactor all sets to use d3.map)
+
+  // count all toplevelHeapLayoutIDs as already rendered since we will render them
+  // in the d3 .each() statement labeled 'FOOBAR' (might be confusing!)
+  $.each(toplevelHeapLayoutIDs, function(k, v) {
+    renderedObjectIDs[k] = v;
+  });
+
+
+  // render the heap by mapping toplevelHeapLayout into  and ');
+          headerTr.find('td:last').append(ind - 1);
+
+          contentTr.append('');
+          renderNestedObject(val, contentTr.find('td:last'));
+        });
+      }
+    }
+    else if (obj[0] == 'SET') {
+
+    }
+    else if (obj[0] == 'DICT') {
+
+    }
+    else if (obj[0] == 'INSTANCE') {
+    }
+    else if (obj[0] == 'CLASS') {
+    }
+    else if (obj[0] == 'FUNCTION') {
+    }
+    else {
+      // render custom data type
+    }
+  }
+
+
+
+  // prepend heap header after all the dust settles:
+  $(vizDiv + ' #heap').prepend('
Objects
');
+
+  return;
+
+  // Key:   CSS ID of the div element representing the variable
+  //        (or heap object, for heap->heap connections, where the
+  //        format is: 'heap_pointer_src_')
+  // Value: CSS ID of the div element representing the value rendered in the heap
+  //        (the format is: 'heap_object_')
+  var connectionEndpointIDs = {};
+  var heapConnectionEndpointIDs = {}; // subset of connectionEndpointIDs for heap->heap connections
+
+  var heap_pointer_src_id = 1; // increment this to be unique for each heap_pointer_src_*
+
+
+  // nested helper functions are SUPER-helpful!
+
+  // render the JS data object obj inside of jDomElt,
+  // which is a jQuery wrapped DOM object
+  // (obj is in a format encoded by pg_encoder.py on the backend)
+  // isTopLevel is true only if this is a top-level heap object (rather
+  // than a nested sub-object)
+  function renderData(obj, jDomElt, isTopLevel) {
+    var typ = typeof obj;
+    var oID = getObjectID(obj);
+
+    if (isPrimitiveType(obj)) {
+      // only wrap primitive types in heap objects if they are at the
+      // TOP-LEVEL (otherwise just render them inline within other data
+      // structures)
+      if (isTopLevel) {
+        jDomElt.append('
');
+        jDomElt = $('#heap_object_' + oID);
+      }
+
+      if (obj == null) {
+        jDomElt.append('None');
+      }
+      else if (typ == "number") {
+        jDomElt.append('' + obj + '');
+      }
+      else if (typ == "boolean") {
+        if (obj) {
+          jDomElt.append('True');
+        }
+        else {
+          jDomElt.append('False');
+        }
+      }
+      else if (typ == "string") {
+        // escape using htmlspecialchars to prevent HTML/script injection
+        var literalStr = htmlspecialchars(obj);
+
+        // print as a double-quoted string literal
+        literalStr = literalStr.replace(new RegExp('\"', 'g'), '\\"'); // replace ALL
+        literalStr = '"' + literalStr + '"';
+
+        jDomElt.append('' + literalStr + '');
+      }
+    }
+    else {
+      assert(typ == "object");
+      assert($.isArray(obj));
+
+      if ((compound_objects_already_rendered[oID] !== undefined) ||
+          (obj[0] == 'CIRCULAR_REF')) {
+        // render heap->heap connection
+        if (!isTopLevel) {
+          // add a stub so that we can connect it with a connector later.
+          // IE needs this div to be NON-EMPTY in order to properly
+          // render jsPlumb endpoints, so that's why we add an " "!
+
+          var srcDivID = 'heap_pointer_src_' + heap_pointer_src_id;
+          heap_pointer_src_id++; // just make sure each source has a UNIQUE ID
+          jDomElt.append('
 
');
+
+          assert(connectionEndpointIDs[srcDivID] === undefined);
+          connectionEndpointIDs[srcDivID] = 'heap_object_' + oID;
+
+          assert(heapConnectionEndpointIDs[srcDivID] === undefined);
+          heapConnectionEndpointIDs[srcDivID] = 'heap_object_' + oID;
+        }
+      }
+      else {
+        // wrap compound objects in a heapObject div so that jsPlumb
+        // connectors can point to it:
+        jDomElt.append('
');
+        jDomElt = $('#heap_object_' + oID);
+        
+        if (obj[0] == 'LIST') {
+          assert(obj.length >= 2);
+          if (obj.length == 2) {
+            jDomElt.append('
empty list
');
+          }
+          else {
+            jDomElt.append('
list
');
+
+            jDomElt.append('
 elements using d3
+  d3.select(vizDiv + ' #heap')
+    .selectAll('table')
+    .data(toplevelHeapLayout)
+    .enter().append('table')
+    .attr('class', 'heapRow')
+    .selectAll('td')
+    .data(function(d, i) {return d;}) // map over each row ...
+    .enter().append('td')
+    .attr('class', 'toplevelHeapObject')
+    .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;})
+    .append('div')
+    .attr('class', 'heapObject')
+    .attr('id', function(d, i) {return 'heap_object_' + d;})
+    .each(function(objID, i) {
+      renderCompoundObject(objID, $(this), true); // label FOOBAR (see renderedObjectIDs)
+    });
+
+
+  function renderNestedObject(obj, d3DomElement) {
+    if (isPrimitiveType(obj)) {
+      renderPrimitiveObject(obj, d3DomElement, false);
+    }
+    else {
+      renderCompoundObject(getRefID(obj), d3DomElement, false);
+    }
+  }
+
+
+  function renderPrimitiveObject(obj, d3DomElement) {
+    var typ = typeof obj;
+
+    if (obj == null) {
+      d3DomElement.append('None');
+    }
+    else if (typ == "number") {
+      d3DomElement.append('' + obj + '');
+    }
+    else if (typ == "boolean") {
+      if (obj) {
+        d3DomElement.append('True');
+      }
+      else {
+        d3DomElement.append('False');
+      }
+    }
+    else if (typ == "string") {
+      // escape using htmlspecialchars to prevent HTML/script injection
+      var literalStr = htmlspecialchars(obj);
+
+      // print as a double-quoted string literal
+      literalStr = literalStr.replace(new RegExp('\"', 'g'), '\\"'); // replace ALL
+      literalStr = '"' + literalStr + '"';
+
+      d3DomElement.append('' + literalStr + '');
+    }
+    else {
+      assert(false);
+    }
+  }
+
+
+  function renderCompoundObject(objID, d3DomElement, isTopLevel) {
+    if (!isTopLevel && (renderedObjectIDs[objID] != undefined)) {
+      // TODO: render jsPlumb arrow source since this heap object has already been rendered
+
+      return; // early return!
+    }
+
+    renderedObjectIDs[objID] = 1;
+
+    var obj = curEntry.heap[objID];
+    assert($.isArray(obj));
+
+    if (obj[0] == 'LIST' || obj[0] == 'TUPLE') {
+      var label = obj[0] == 'LIST' ? 'list' : 'tuple';
+
+      assert(obj.length >= 1);
+      if (obj.length == 1) {
+        d3DomElement.append('
empty ' + label + '
');
+      }
+      else {
+        d3DomElement.append('
' + label + '
');
+        d3DomElement.append('
');
+        var tbl = d3DomElement.children('table');
+        var headerTr = tbl.find('tr:first');
+        var contentTr = tbl.find('tr:last');
+        $.each(obj, function(ind, val) {
+          if (ind < 1) return; // skip type tag and ID entry
+
+          // add a new column and then pass in that newly-added column
+          // as d3DomElement to the recursive call to child:
+          headerTr.append('
');
+            var tbl = jDomElt.children('table');
+            var headerTr = tbl.find('tr:first');
+            var contentTr = tbl.find('tr:last');
+            jQuery.each(obj, function(ind, val) {
+              if (ind < 2) return; // skip 'LIST' tag and ID entry
+
+              // add a new column and then pass in that newly-added column
+              // as jDomElt to the recursive call to child:
+              headerTr.append('');
+              headerTr.find('td:last').append(ind - 2);
+
+              contentTr.append('');
+
+              // heuristic for rendering top-level 1-D linked data structures as separate top-level objects
+              // (and then drawing an arrow to the next element using a regular renderData() call)
+              if (isTopLevel && structurallyEquivalent(obj, val)) {
+                var childHeapObjectID = 'toplevel_heap_object_' + getObjectID(val);
+
+                var enclosingTr = jDomElt.parent().parent();
+                enclosingTr.append('');
+                renderData(val, enclosingTr.find('#' + childHeapObjectID), true /* isTopLevel */);
+              }
+
+              renderData(val, contentTr.find('td:last'), false);
+            });
+          }
+        }
+        else if (obj[0] == 'TUPLE') {
+          assert(obj.length >= 2);
+          if (obj.length == 2) {
+            jDomElt.append('
empty tuple
');
+          }
+          else {
+            jDomElt.append('
tuple
');
+            jDomElt.append('
');
+            var tbl = jDomElt.children('table');
+            var headerTr = tbl.find('tr:first');
+            var contentTr = tbl.find('tr:last');
+            jQuery.each(obj, function(ind, val) {
+              if (ind < 2) return; // skip 'TUPLE' tag and ID entry
+
+              // add a new column and then pass in that newly-added column
+              // as jDomElt to the recursive call to child:
+              headerTr.append('');
+              headerTr.find('td:last').append(ind - 2);
+
+              contentTr.append('');
+
+              // heuristic for rendering top-level 1-D linked data structures as separate top-level objects
+              // (and then drawing an arrow to the next element using a regular renderData() call)
+              if (isTopLevel && structurallyEquivalent(obj, val)) {
+                var childHeapObjectID = 'toplevel_heap_object_' + getObjectID(val);
+
+                var enclosingTr = jDomElt.parent().parent();
+                enclosingTr.append('');
+                renderData(val, enclosingTr.find('#' + childHeapObjectID), true /* isTopLevel */);
+              }
+
+              renderData(val, contentTr.find('td:last'), false);
+            });
+          }
+        }
+        else if (obj[0] == 'SET') {
+          assert(obj.length >= 2);
+          if (obj.length == 2) {
+            jDomElt.append('
empty set
');
+          }
+          else {
+            jDomElt.append('
set
');
+            jDomElt.append('
');
+            var tbl = jDomElt.children('table');
+            // create an R x C matrix:
+            var numElts = obj.length - 2;
+            // gives roughly a 3x5 rectangular ratio, square is too, err,
+            // 'square' and boring
+            var numRows = Math.round(Math.sqrt(numElts));
+            if (numRows > 3) {
+              numRows -= 1;
+            }
+
+            var numCols = Math.round(numElts / numRows);
+            // round up if not a perfect multiple:
+            if (numElts % numRows) {
+              numCols += 1;
+            }
+
+            jQuery.each(obj, function(ind, val) {
+              if (ind < 2) return; // skip 'SET' tag and ID entry
+
+              if (((ind - 2) % numCols) == 0) {
+                tbl.append('');
+              }
+
+              var curTr = tbl.find('tr:last');
+              curTr.append('');
+              renderData(val, curTr.find('td:last'), false);
+            });
+          }
+        }
+        else if (obj[0] == 'DICT') {
+          assert(obj.length >= 2);
+          if (obj.length == 2) {
+            jDomElt.append('
empty dict
');
+          }
+          else {
+            jDomElt.append('
dict
');
+            jDomElt.append('
');
+            var tbl = jDomElt.children('table');
+            $.each(obj, function(ind, kvPair) {
+              if (ind < 2) return; // skip 'DICT' tag and ID entry
+
+              tbl.append('');
+              var newRow = tbl.find('tr:last');
+              var keyTd = newRow.find('td:first');
+              var valTd = newRow.find('td:last');
+
+              var key = kvPair[0];
+              var val = kvPair[1];
+
+              renderData(key, keyTd, false);
+
+              // heuristic for rendering top-level 1-D linked data structures as separate top-level objects
+              // (and then drawing an arrow to the next element using a regular renderData() call)
+              if (isTopLevel && structurallyEquivalent(obj, val)) {
+                var childHeapObjectID = 'toplevel_heap_object_' + getObjectID(val);
+
+                var enclosingTr = jDomElt.parent().parent();
+                enclosingTr.append('');
+                renderData(val, enclosingTr.find('#' + childHeapObjectID), true /* isTopLevel */);
+              }
+
+              renderData(val, valTd, false);
+            });
+          }
+        }
+        else if (obj[0] == 'INSTANCE') {
+          assert(obj.length >= 3);
+          jDomElt.append('
' + obj[1] + ' instance
');
+
+          if (obj.length > 3) {
+            jDomElt.append('
');
+            var tbl = jDomElt.children('table');
+            $.each(obj, function(ind, kvPair) {
+              if (ind < 3) return; // skip type tag, class name, and ID entry
+
+              tbl.append('');
+              var newRow = tbl.find('tr:last');
+              var keyTd = newRow.find('td:first');
+              var valTd = newRow.find('td:last');
+
+              // the keys should always be strings, so render them directly (and without quotes):
+              assert(typeof kvPair[0] == "string");
+              var attrnameStr = htmlspecialchars(kvPair[0]);
+              keyTd.append('' + attrnameStr + '');
+
+              // values can be arbitrary objects, so recurse:
+              var val = kvPair[1];
+
+              // heuristic for rendering top-level 1-D linked data structures as separate top-level objects
+              // (and then drawing an arrow to the next element using a regular renderData() call)
+              if (isTopLevel && structurallyEquivalent(obj, val)) {
+                var childHeapObjectID = 'toplevel_heap_object_' + getObjectID(val);
+
+                var enclosingTr = jDomElt.parent().parent();
+                enclosingTr.append('');
+                renderData(val, enclosingTr.find('#' + childHeapObjectID), true /* isTopLevel */);
+              }
+
+              renderData(val, valTd, false);
+            });
+          }
+        }
+        else if (obj[0] == 'CLASS') {
+          assert(obj.length >= 4);
+          var superclassStr = '';
+          if (obj[3].length > 0) {
+            superclassStr += ('[extends ' + obj[3].join(',') + '] ');
+          }
+
+          jDomElt.append('
' + obj[1] + ' class ' + superclassStr + '
');
+
+          if (obj.length > 4) {
+            jDomElt.append('
');
+            var tbl = jDomElt.children('table');
+            $.each(obj, function(ind, kvPair) {
+              if (ind < 4) return; // skip type tag, class name, ID, and superclasses entries
+
+              tbl.append('');
+              var newRow = tbl.find('tr:last');
+              var keyTd = newRow.find('td:first');
+              var valTd = newRow.find('td:last');
+
+              // the keys should always be strings, so render them directly (and without quotes):
+              assert(typeof kvPair[0] == "string");
+              var attrnameStr = htmlspecialchars(kvPair[0]);
+              keyTd.append('' + attrnameStr + '');
+
+              // values can be arbitrary objects, so recurse:
+              renderData(kvPair[1], valTd, false);
+            });
+          }
+        }
+        else if (obj[0] == 'FUNCTION') {
+          assert(obj.length == 4);
+          id = obj[1];
+          funcName = htmlspecialchars(obj[2]); // for displaying names like ''
+          parentFrameID = obj[3]; // optional
+
+          if (parentFrameID) {
+            jDomElt.append('
function ' + funcName + ' [parent=f'+ parentFrameID + ']
');
+          }
+          else {
+            jDomElt.append('
function ' + funcName + '
');
+          }
+
+        }
+        else {
+          // render custom data type
+          assert(obj.length == 3);
+          typeName = obj[0];
+          id = obj[1];
+          strRepr = obj[2];
+
+          // if obj[2] is like ' at 0x84760>',
+          // then display an abbreviated version rather than the gory details
+          noStrReprRE = /<.* at 0x.*>/;
+          if (noStrReprRE.test(strRepr)) {
+            jDomElt.append('' + typeName + '');
+          }
+          else {
+            strRepr = htmlspecialchars(strRepr); // escape strings!
+
+            // warning: we're overloading tuple elts for custom data types
+            jDomElt.append('
' + typeName + '
');
+            jDomElt.append('
' + strRepr + '
');
+          }
+        }
+
+        compound_objects_already_rendered[oID] = 1; // add to set
+      }
+    }
+  }
+
+
+  function renderGlobals() {
+    // render all global variables IN THE ORDER they were created by the program,
+    // in order to ensure continuity:
+    if (curEntry.ordered_globals.length > 0) {
+      $(vizDiv + " #stack").append('
Global variables
');
+
+      $(vizDiv + " #stack #globals").append('
');
+
+      var tbl = $(vizDiv + " #global_table");
+      // iterate IN ORDER (it's possible that not all vars are in curEntry.globals)
+      $.each(curEntry.ordered_globals, function(i, varname) {
+        var val = curEntry.globals[varname];
+        // (use '!==' to do an EXACT match against undefined)
+        if (val !== undefined) { // might not be defined at this line, which is OKAY!
+          tbl.append('' + varname + '');
+          var curTr = tbl.find('tr:last');
+
+          if (renderInline(val)) {
+            renderData(val, curTr.find("td.stackFrameValue"), false /* don't wrap it in a .heapObject div */);
+          }
+          else{
+            // add a stub so that we can connect it with a connector later.
+            // IE needs this div to be NON-EMPTY in order to properly
+            // render jsPlumb endpoints, so that's why we add an " "!
+
+            // make sure varname doesn't contain any weird
+            // characters that are illegal for CSS ID's ...
+            var varDivID = 'global__' + varnameToCssID(varname);
+            curTr.find("td.stackFrameValue").append('
 
');
+
+            assert(connectionEndpointIDs[varDivID] === undefined);
+            var heapObjID = 'heap_object_' + getObjectID(val);
+            connectionEndpointIDs[varDivID] = heapObjID;
+          }
+        }
+      });
+    }
+  }
+
+  function renderStackFrame(frame, ind, is_zombie) {
+    var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
+    var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
+
+    // optional (btw, this isn't a CSS id)
+    var parentFrameID = null;
+    if (frame.parent_frame_id_list.length > 0) {
+      parentFrameID = frame.parent_frame_id_list[0];
+    }
+
+    var localVars = frame.encoded_locals
+
+    // the stackFrame div's id is simply its index ("stack")
+
+    var divClass, divID, headerDivID;
+    if (is_zombie) {
+      divClass = 'zombieStackFrame';
+      divID = "zombie_stack" + ind;
+      headerDivID = "zombie_stack_header" + ind;
+    }
+    else {
+      divClass = 'stackFrame';
+      divID = "stack" + ind;
+      headerDivID = "stack_header" + ind;
+    }
+
+    $(vizDiv + " #stack").append('
');
+
+    var headerLabel = funcName + '()';
+    if (frameID) {
+      headerLabel = 'f' + frameID + ': ' + headerLabel;
+    }
+    if (parentFrameID) {
+      headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
+    }
+    $(vizDiv + " #stack #" + divID).append('
' + headerLabel + '
');
+
+
+    if (frame.ordered_varnames.length > 0) {
+      var tableID = divID + '_table';
+      $(vizDiv + " #stack #" + divID).append('
');
+
+      var tbl = $(vizDiv + " #" + tableID);
+
+      $.each(frame.ordered_varnames, function(xxx, varname) {
+        var val = localVars[varname];
+
+        // don't render return values for zombie frames
+        if (is_zombie && varname == '__return__') {
+          return;
+        }
+
+        // special treatment for displaying return value and indicating
+        // that the function is about to return to its caller
+        //
+        // DON'T do this for zombie frames
+        if (varname == '__return__' && !is_zombie) {
+          assert(curEntry.event == 'return'); // sanity check
+
+          tbl.append('About to return');
+          tbl.append('Return value:');
+        }
+        else {
+          tbl.append('' + varname + '');
+        }
+
+        var curTr = tbl.find('tr:last');
+
+        if (renderInline(val)) {
+          renderData(val, curTr.find("td.stackFrameValue"), false /* don't wrap it in a .heapObject div */);
+        }
+        else {
+          // add a stub so that we can connect it with a connector later.
+          // IE needs this div to be NON-EMPTY in order to properly
+          // render jsPlumb endpoints, so that's why we add an " "!
+
+          // make sure varname doesn't contain any weird
+          // characters that are illegal for CSS ID's ...
+          var varDivID = divID + '__' + varnameToCssID(varname);
+          curTr.find("td.stackFrameValue").append('
 
');
+
+          assert(connectionEndpointIDs[varDivID] === undefined);
+          var heapObjID = 'heap_object_' + getObjectID(val);
+          connectionEndpointIDs[varDivID] = heapObjID;
+        }
+      });
+
+    }
+
+  }
+
+
+  // first render the stack (and global vars)
+  renderGlobals();
+
+  // merge zombie_stack_locals and stack_locals into one master
+  // ordered list using some simple rules for aesthetics
+  var stack_to_render = [];
+
+  // first push all regular stack entries backwards
+  if (curEntry.stack_locals) {
+    for (var i = curEntry.stack_locals.length - 1; i >= 0; i--) {
+      var entry = curEntry.stack_locals[i];
+      entry.is_zombie = false;
+      entry.is_highlighted = (i == 0);
+      stack_to_render.push(entry);
+    }
+  }
+
+  // zombie stack consists of exited functions that have returned nested functions
+  // push zombie stack entries at the BEGINNING of stack_to_render,
+  // EXCEPT put zombie entries BEHIND regular entries that are their parents
+  if (curEntry.zombie_stack_locals) {
+
+    for (var i = curEntry.zombie_stack_locals.length - 1; i >= 0; i--) {
+      var entry = curEntry.zombie_stack_locals[i];
+      entry.is_zombie = true;
+      entry.is_highlighted = false; // never highlight zombie entries
+
+      // j should be 0 most of the time, so we're always inserting new
+      // elements to the front of stack_to_render (which is why we are
+      // iterating backwards over zombie_stack_locals).
+      var j = 0;
+      for (j = 0; j < stack_to_render.length; j++) {
+        if ($.inArray(stack_to_render[j].frame_id, entry.parent_frame_id_list) >= 0) {
+          continue;
+        }
+        break;
+      }
+
+      stack_to_render.splice(j, 0, entry);
+    }
+
+  }
+
+
+  $.each(stack_to_render, function(i, e) {
+    renderStackFrame(e, i, e.is_zombie);
+  });
+
+
+  // then render the heap
+
+  alreadyRenderedObjectIDs = {}; // set of object IDs that have already been rendered
+
+  // if addToEnd is true, then APPEND to the end of the heap,
+  // otherwise PREPEND to the front
+  function renderHeapObjectDEPRECATED(obj, addToEnd) {
+    var objectID = getObjectID(obj);
+
+    if (alreadyRenderedObjectIDs[objectID] === undefined) {
+      var toplevelHeapObjID = 'toplevel_heap_object_' + objectID;
+      var newDiv = '
';
+
+      if (addToEnd) {
+        $(vizDiv + ' #heap').append(newDiv);
+      }
+      else {
+        $(vizDiv + ' #heap').prepend(newDiv);
+      }
+      renderData(obj, $(vizDiv + ' #heap #' + toplevelHeapObjID), true);
+
+      alreadyRenderedObjectIDs[objectID] = 1;
+    }
+  }
+
+
+  // if there are multiple aliases to the same object, we want to render
+  // the one deepest in the stack, so that we can hopefully prevent
+  // objects from jumping around as functions are called and returned.
+  // e.g., if a list L appears as a global variable and as a local in a
+  // function, we want to render L when rendering the global frame.
+
+  // this is straightforward: just go through globals first and then
+  // each stack frame in order :)
+
+  $.each(curEntry.ordered_globals, function(i, varname) {
+    var val = curEntry.globals[varname];
+    if (!renderInline(val)) {
+      renderHeapObject(val, true); // APPEND
+    }
+  });
+
+
+  $.each(stack_to_render, function(i, frame) {
+    var localVars = frame.encoded_locals;
+
+    $.each(frame.ordered_varnames, function(i2, varname) {
+
+      // don't render return values for zombie frames
+      if (frame.is_zombie && varname == '__return__') {
+        return;
+      }
+
+      var val = localVars[varname];
+      if (!renderInline(val)) {
+        renderHeapObject(val, true); // APPEND
+      }
+    });
+  });
+
+  
+  // prepend heap header after all the dust settles:
+  $(vizDiv + ' #heap').prepend('
Objects
');
+
+
+  // finally connect stack variables to heap objects via connectors
+  for (varID in connectionEndpointIDs) {
+    var valueID = connectionEndpointIDs[varID];
+    jsPlumb.connect({source: varID, target: valueID});
+  }
+
+
+  function highlight_frame(frameID) {
+    var allConnections = jsPlumb.getConnections();
+    for (var i = 0; i < allConnections.length; i++) {
+      var c = allConnections[i];
+
+      // this is VERY VERY fragile code, since it assumes that going up
+      // five layers of parent() calls will get you from the source end
+      // of the connector to the enclosing stack frame
+      var stackFrameDiv = c.source.parent().parent().parent().parent().parent();
+
+      // if this connector starts in the selected stack frame ...
+      if (stackFrameDiv.attr('id') == frameID) {
+        // then HIGHLIGHT IT!
+        c.setPaintStyle({lineWidth:1, strokeStyle: darkBlue});
+        c.endpoints[0].setPaintStyle({fillStyle: darkBlue});
+        c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
+
+        // ... and move it to the VERY FRONT
+        $(c.canvas).css("z-index", 1000);
+      }
+      // for heap->heap connectors
+      else if (heapConnectionEndpointIDs[c.endpoints[0].elementId] !== undefined) {
+        // then HIGHLIGHT IT!
+        c.setPaintStyle({lineWidth:1, strokeStyle: darkBlue}); // make thinner
+        c.endpoints[0].setPaintStyle({fillStyle: darkBlue});
+        c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
+        //c.setConnector([ "Bezier", {curviness: 80} ]); // make it more curvy
+        c.setConnector([ "StateMachine" ]);
+        c.addOverlay([ "Arrow", { length: 10, width:7, foldback:0.55, location:1 }]);
+      }
+      else {
+        // else unhighlight it
+        c.setPaintStyle({lineWidth:1, strokeStyle: lightGray});
+        c.endpoints[0].setPaintStyle({fillStyle: lightGray});
+        c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
+        $(c.canvas).css("z-index", 0);
+      }
+    }
+
+    // clear everything, then just activate $(this) one ...
+    $(".stackFrame").removeClass("highlightedStackFrame");
+    $('#' + frameID).addClass("highlightedStackFrame");
+  }
+
+
+  // highlight the top-most non-zombie stack frame or, if not available, globals
+  var frame_already_highlighted = false;
+  $.each(stack_to_render, function(i, e) {
+    if (e.is_highlighted) {
+      highlight_frame('stack' + i);
+      frame_already_highlighted = true;
+    }
+  });
+
+  if (!frame_already_highlighted) {
+    highlight_frame('globals');
+  }
+
+}
+
+
+// DEPRECATED!
+function renderDataStructuresV2(curEntry, vizDiv) {
+
+  // VERY VERY IMPORTANT --- and reset ALL jsPlumb state to prevent
+  // weird mis-behavior!!!
+  jsPlumb.reset();
+
+
+  // store a set of IDs of compound objects that have already been
+  // rendered in this particular call
+  var compound_objects_already_rendered = {};
+
+
+  $(vizDiv).empty(); // jQuery empty() is better than .html('')
+
+
+  // create a tabular layout for stack and heap side-by-side
+  // TODO: figure out how to do this using CSS in a robust way!
+  $(vizDiv).html('
');
+
+  $(vizDiv + " #stack").append('
Frames
');
+
+
+  var nonEmptyGlobals = false;
+  var curGlobalFields = {};
+  if (curEntry.globals != undefined) {
+    // use plain ole' iteration rather than jQuery $.each() since
+    // the latter breaks when a variable is named "length"
+    for (varname in curEntry.globals) {
+      curGlobalFields[varname] = true;
+      nonEmptyGlobals = true;
+    }
+  }
+
+  // Key:   CSS ID of the div element representing the variable
+  //        (or heap object, for heap->heap connections, where the
+  //        format is: 'heap_pointer_src_')
+  // Value: CSS ID of the div element representing the value rendered in the heap
+  //        (the format is: 'heap_object_')
+  var connectionEndpointIDs = {};
+  var heapConnectionEndpointIDs = {}; // subset of connectionEndpointIDs for heap->heap connections
+
+  var heap_pointer_src_id = 1; // increment this to be unique for each heap_pointer_src_*
+
+
+  // nested helper functions are SUPER-helpful!
+
+  // render the JS data object obj inside of jDomElt,
+  // which is a jQuery wrapped DOM object
+  // (obj is in a format encoded by pg_encoder.py on the backend)
+  // isTopLevel is true only if this is a top-level heap object (rather
+  // than a nested sub-object)
+  function renderData(obj, jDomElt, isTopLevel) {
+    var typ = typeof obj;
+    var oID = getObjectID(obj);
+
+    if (isPrimitiveType(obj)) {
+      // only wrap primitive types in heap objects if they are at the
+      // TOP-LEVEL (otherwise just render them inline within other data
+      // structures)
+      if (isTopLevel) {
+        jDomElt.append('
');
+        jDomElt = $('#heap_object_' + oID);
+      }
+
+      if (obj == null) {
+        jDomElt.append('None');
+      }
+      else if (typ == "number") {
+        jDomElt.append('' + obj + '');
+      }
+      else if (typ == "boolean") {
+        if (obj) {
+          jDomElt.append('True');
+        }
+        else {
+          jDomElt.append('False');
+        }
+      }
+      else if (typ == "string") {
+        // escape using htmlspecialchars to prevent HTML/script injection
+        var literalStr = htmlspecialchars(obj);
+
+        // print as a double-quoted string literal
+        literalStr = literalStr.replace(new RegExp('\"', 'g'), '\\"'); // replace ALL
+        literalStr = '"' + literalStr + '"';
+
+        jDomElt.append('' + literalStr + '');
+      }
+    }
+    else {
+      assert(typ == "object");
+      assert($.isArray(obj));
+
+      if ((compound_objects_already_rendered[oID] !== undefined) ||
+          (obj[0] == 'CIRCULAR_REF')) {
+        // render heap->heap connection
+        if (!isTopLevel) {
+          // add a stub so that we can connect it with a connector later.
+          // IE needs this div to be NON-EMPTY in order to properly
+          // render jsPlumb endpoints, so that's why we add an " "!
+
+          var srcDivID = 'heap_pointer_src_' + heap_pointer_src_id;
+          heap_pointer_src_id++; // just make sure each source has a UNIQUE ID
+          jDomElt.append('
 
');
+
+          assert(connectionEndpointIDs[srcDivID] === undefined);
+          connectionEndpointIDs[srcDivID] = 'heap_object_' + oID;
+
+          assert(heapConnectionEndpointIDs[srcDivID] === undefined);
+          heapConnectionEndpointIDs[srcDivID] = 'heap_object_' + oID;
+        }
+      }
+      else {
+        // wrap compound objects in a heapObject div so that jsPlumb
+        // connectors can point to it:
+        jDomElt.append('
');
+        jDomElt = $('#heap_object_' + oID);
+        
+        if (obj[0] == 'LIST') {
+          assert(obj.length >= 2);
+          if (obj.length == 2) {
+            jDomElt.append('
empty list
');
+          }
+          else {
+            jDomElt.append('
list
');
+
+            jDomElt.append('
');
+            var tbl = jDomElt.children('table');
+            var headerTr = tbl.find('tr:first');
+            var contentTr = tbl.find('tr:last');
+            jQuery.each(obj, function(ind, val) {
+              if (ind < 2) return; // skip 'LIST' tag and ID entry
+
+              // add a new column and then pass in that newly-added column
+              // as jDomElt to the recursive call to child:
+              headerTr.append('');
+              headerTr.find('td:last').append(ind - 2);
+
+              contentTr.append('');
+
+              // heuristic for rendering top-level 1-D linked data structures as separate top-level objects
+              // (and then drawing an arrow to the next element using a regular renderData() call)
+              if (isTopLevel && structurallyEquivalent(obj, val)) {
+                var childHeapObjectID = 'toplevel_heap_object_' + getObjectID(val);
+
+                var enclosingTr = jDomElt.parent().parent();
+                enclosingTr.append('');
+                renderData(val, enclosingTr.find('#' + childHeapObjectID), true /* isTopLevel */);
+              }
+
+              renderData(val, contentTr.find('td:last'), false);
+            });
+          }
+        }
+        else if (obj[0] == 'TUPLE') {
+          assert(obj.length >= 2);
+          if (obj.length == 2) {
+            jDomElt.append('
empty tuple
');
+          }
+          else {
+            jDomElt.append('
tuple
');
+            jDomElt.append('
');
+            var tbl = jDomElt.children('table');
+            var headerTr = tbl.find('tr:first');
+            var contentTr = tbl.find('tr:last');
+            jQuery.each(obj, function(ind, val) {
+              if (ind < 2) return; // skip 'TUPLE' tag and ID entry
+
+              // add a new column and then pass in that newly-added column
+              // as jDomElt to the recursive call to child:
+              headerTr.append('');
+              headerTr.find('td:last').append(ind - 2);
+
+              contentTr.append('');
+
+              // heuristic for rendering top-level 1-D linked data structures as separate top-level objects
+              // (and then drawing an arrow to the next element using a regular renderData() call)
+              if (isTopLevel && structurallyEquivalent(obj, val)) {
+                var childHeapObjectID = 'toplevel_heap_object_' + getObjectID(val);
+
+                var enclosingTr = jDomElt.parent().parent();
+                enclosingTr.append('');
+                renderData(val, enclosingTr.find('#' + childHeapObjectID), true /* isTopLevel */);
+              }
+
+              renderData(val, contentTr.find('td:last'), false);
+            });
+          }
+        }
+        else if (obj[0] == 'SET') {
+          assert(obj.length >= 2);
+          if (obj.length == 2) {
+            jDomElt.append('
empty set
');
+          }
+          else {
+            jDomElt.append('
set
');
+            jDomElt.append('
');
+            var tbl = jDomElt.children('table');
+            // create an R x C matrix:
+            var numElts = obj.length - 2;
+            // gives roughly a 3x5 rectangular ratio, square is too, err,
+            // 'square' and boring
+            var numRows = Math.round(Math.sqrt(numElts));
+            if (numRows > 3) {
+              numRows -= 1;
+            }
+
+            var numCols = Math.round(numElts / numRows);
+            // round up if not a perfect multiple:
+            if (numElts % numRows) {
+              numCols += 1;
+            }
+
+            jQuery.each(obj, function(ind, val) {
+              if (ind < 2) return; // skip 'SET' tag and ID entry
+
+              if (((ind - 2) % numCols) == 0) {
+                tbl.append('');
+              }
+
+              var curTr = tbl.find('tr:last');
+              curTr.append('');
+              renderData(val, curTr.find('td:last'), false);
+            });
+          }
+        }
+        else if (obj[0] == 'DICT') {
+          assert(obj.length >= 2);
+          if (obj.length == 2) {
+            jDomElt.append('
empty dict
');
+          }
+          else {
+            jDomElt.append('
dict
');
+            jDomElt.append('
');
+            var tbl = jDomElt.children('table');
+            $.each(obj, function(ind, kvPair) {
+              if (ind < 2) return; // skip 'DICT' tag and ID entry
+
+              tbl.append('');
+              var newRow = tbl.find('tr:last');
+              var keyTd = newRow.find('td:first');
+              var valTd = newRow.find('td:last');
+
+              var key = kvPair[0];
+              var val = kvPair[1];
+
+              renderData(key, keyTd, false);
+
+              // heuristic for rendering top-level 1-D linked data structures as separate top-level objects
+              // (and then drawing an arrow to the next element using a regular renderData() call)
+              if (isTopLevel && structurallyEquivalent(obj, val)) {
+                var childHeapObjectID = 'toplevel_heap_object_' + getObjectID(val);
+
+                var enclosingTr = jDomElt.parent().parent();
+                enclosingTr.append('');
+                renderData(val, enclosingTr.find('#' + childHeapObjectID), true /* isTopLevel */);
+              }
+
+              renderData(val, valTd, false);
+            });
+          }
+        }
+        else if (obj[0] == 'INSTANCE') {
+          assert(obj.length >= 3);
+          jDomElt.append('
' + obj[1] + ' instance
');
+
+          if (obj.length > 3) {
+            jDomElt.append('
');
+            var tbl = jDomElt.children('table');
+            $.each(obj, function(ind, kvPair) {
+              if (ind < 3) return; // skip type tag, class name, and ID entry
+
+              tbl.append('');
+              var newRow = tbl.find('tr:last');
+              var keyTd = newRow.find('td:first');
+              var valTd = newRow.find('td:last');
+
+              // the keys should always be strings, so render them directly (and without quotes):
+              assert(typeof kvPair[0] == "string");
+              var attrnameStr = htmlspecialchars(kvPair[0]);
+              keyTd.append('' + attrnameStr + '');
+
+              // values can be arbitrary objects, so recurse:
+              var val = kvPair[1];
+
+              // heuristic for rendering top-level 1-D linked data structures as separate top-level objects
+              // (and then drawing an arrow to the next element using a regular renderData() call)
+              if (isTopLevel && structurallyEquivalent(obj, val)) {
+                var childHeapObjectID = 'toplevel_heap_object_' + getObjectID(val);
+
+                var enclosingTr = jDomElt.parent().parent();
+                enclosingTr.append('');
+                renderData(val, enclosingTr.find('#' + childHeapObjectID), true /* isTopLevel */);
+              }
+
+              renderData(val, valTd, false);
+            });
+          }
+        }
+        else if (obj[0] == 'CLASS') {
+          assert(obj.length >= 4);
+          var superclassStr = '';
+          if (obj[3].length > 0) {
+            superclassStr += ('[extends ' + obj[3].join(',') + '] ');
+          }
+
+          jDomElt.append('
' + obj[1] + ' class ' + superclassStr + '
');
+
+          if (obj.length > 4) {
+            jDomElt.append('
');
+            var tbl = jDomElt.children('table');
+            $.each(obj, function(ind, kvPair) {
+              if (ind < 4) return; // skip type tag, class name, ID, and superclasses entries
+
+              tbl.append('');
+              var newRow = tbl.find('tr:last');
+              var keyTd = newRow.find('td:first');
+              var valTd = newRow.find('td:last');
+
+              // the keys should always be strings, so render them directly (and without quotes):
+              assert(typeof kvPair[0] == "string");
+              var attrnameStr = htmlspecialchars(kvPair[0]);
+              keyTd.append('' + attrnameStr + '');
+
+              // values can be arbitrary objects, so recurse:
+              renderData(kvPair[1], valTd, false);
+            });
+          }
+        }
+        else if (obj[0] == 'FUNCTION') {
+          assert(obj.length == 4);
+          id = obj[1];
+          funcName = htmlspecialchars(obj[2]); // for displaying names like ''
+          parentFrameID = obj[3]; // optional
+
+          if (parentFrameID) {
+            jDomElt.append('
function ' + funcName + ' [parent=f'+ parentFrameID + ']
');
+          }
+          else {
+            jDomElt.append('
function ' + funcName + '
');
+          }
+
+        }
+        else {
+          // render custom data type
+          assert(obj.length == 3);
+          typeName = obj[0];
+          id = obj[1];
+          strRepr = obj[2];
+
+          // if obj[2] is like ' at 0x84760>',
+          // then display an abbreviated version rather than the gory details
+          noStrReprRE = /<.* at 0x.*>/;
+          if (noStrReprRE.test(strRepr)) {
+            jDomElt.append('' + typeName + '');
+          }
+          else {
+            strRepr = htmlspecialchars(strRepr); // escape strings!
+
+            // warning: we're overloading tuple elts for custom data types
+            jDomElt.append('
' + typeName + '
');
+            jDomElt.append('
' + strRepr + '
');
+          }
+        }
+
+        compound_objects_already_rendered[oID] = 1; // add to set
+      }
+    }
+  }
+
+
+  function renderGlobals() {
+    // render all global variables IN THE ORDER they were created by the program,
+    // in order to ensure continuity:
+    if (curEntry.ordered_globals.length > 0) {
+      $(vizDiv + " #stack").append('
Global variables
');
+
+      $(vizDiv + " #stack #globals").append('
');
+
+      var tbl = $(vizDiv + " #global_table");
+      // iterate IN ORDER (it's possible that not all vars are in curEntry.globals)
+      $.each(curEntry.ordered_globals, function(i, varname) {
+        var val = curEntry.globals[varname];
+        // (use '!==' to do an EXACT match against undefined)
+        if (val !== undefined) { // might not be defined at this line, which is OKAY!
+          tbl.append('' + varname + '');
+          var curTr = tbl.find('tr:last');
+
+          if (renderInline(val)) {
+            renderData(val, curTr.find("td.stackFrameValue"), false /* don't wrap it in a .heapObject div */);
+          }
+          else{
+            // add a stub so that we can connect it with a connector later.
+            // IE needs this div to be NON-EMPTY in order to properly
+            // render jsPlumb endpoints, so that's why we add an " "!
+
+            // make sure varname doesn't contain any weird
+            // characters that are illegal for CSS ID's ...
+            var varDivID = 'global__' + varnameToCssID(varname);
+            curTr.find("td.stackFrameValue").append('
 
');
+
+            assert(connectionEndpointIDs[varDivID] === undefined);
+            var heapObjID = 'heap_object_' + getObjectID(val);
+            connectionEndpointIDs[varDivID] = heapObjID;
+          }
+        }
+      });
+    }
+  }
+
+  function renderStackFrame(frame, ind, is_zombie) {
+    var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
+    var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
+
+    // optional (btw, this isn't a CSS id)
+    var parentFrameID = null;
+    if (frame.parent_frame_id_list.length > 0) {
+      parentFrameID = frame.parent_frame_id_list[0];
+    }
+
+    var localVars = frame.encoded_locals
+
+    // the stackFrame div's id is simply its index ("stack")
+
+    var divClass, divID, headerDivID;
+    if (is_zombie) {
+      divClass = 'zombieStackFrame';
+      divID = "zombie_stack" + ind;
+      headerDivID = "zombie_stack_header" + ind;
+    }
+    else {
+      divClass = 'stackFrame';
+      divID = "stack" + ind;
+      headerDivID = "stack_header" + ind;
+    }
+
+    $(vizDiv + " #stack").append('
');
+
+    var headerLabel = funcName + '()';
+    if (frameID) {
+      headerLabel = 'f' + frameID + ': ' + headerLabel;
+    }
+    if (parentFrameID) {
+      headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
+    }
+    $(vizDiv + " #stack #" + divID).append('
' + headerLabel + '
');
+
+
+    if (frame.ordered_varnames.length > 0) {
+      var tableID = divID + '_table';
+      $(vizDiv + " #stack #" + divID).append('
');
+
+      var tbl = $(vizDiv + " #" + tableID);
+
+      $.each(frame.ordered_varnames, function(xxx, varname) {
+        var val = localVars[varname];
+
+        // don't render return values for zombie frames
+        if (is_zombie && varname == '__return__') {
+          return;
+        }
+
+        // special treatment for displaying return value and indicating
+        // that the function is about to return to its caller
+        //
+        // DON'T do this for zombie frames
+        if (varname == '__return__' && !is_zombie) {
+          assert(curEntry.event == 'return'); // sanity check
+
+          tbl.append('About to return');
+          tbl.append('Return value:');
+        }
+        else {
+          tbl.append('' + varname + '');
+        }
+
+        var curTr = tbl.find('tr:last');
+
+        if (renderInline(val)) {
+          renderData(val, curTr.find("td.stackFrameValue"), false /* don't wrap it in a .heapObject div */);
+        }
+        else {
+          // add a stub so that we can connect it with a connector later.
+          // IE needs this div to be NON-EMPTY in order to properly
+          // render jsPlumb endpoints, so that's why we add an " "!
+
+          // make sure varname doesn't contain any weird
+          // characters that are illegal for CSS ID's ...
+          var varDivID = divID + '__' + varnameToCssID(varname);
+          curTr.find("td.stackFrameValue").append('
 
');
+
+          assert(connectionEndpointIDs[varDivID] === undefined);
+          var heapObjID = 'heap_object_' + getObjectID(val);
+          connectionEndpointIDs[varDivID] = heapObjID;
+        }
+      });
+
+    }
+
+  }
+
+
+  // first render the stack (and global vars)
+  renderGlobals();
+
+  // merge zombie_stack_locals and stack_locals into one master
+  // ordered list using some simple rules for aesthetics
+  var stack_to_render = [];
+
+  // first push all regular stack entries backwards
+  if (curEntry.stack_locals) {
+    for (var i = curEntry.stack_locals.length - 1; i >= 0; i--) {
+      var entry = curEntry.stack_locals[i];
+      entry.is_zombie = false;
+      entry.is_highlighted = (i == 0);
+      stack_to_render.push(entry);
+    }
+  }
+
+  // zombie stack consists of exited functions that have returned nested functions
+  // push zombie stack entries at the BEGINNING of stack_to_render,
+  // EXCEPT put zombie entries BEHIND regular entries that are their parents
+  if (curEntry.zombie_stack_locals) {
+
+    for (var i = curEntry.zombie_stack_locals.length - 1; i >= 0; i--) {
+      var entry = curEntry.zombie_stack_locals[i];
+      entry.is_zombie = true;
+      entry.is_highlighted = false; // never highlight zombie entries
+
+      // j should be 0 most of the time, so we're always inserting new
+      // elements to the front of stack_to_render (which is why we are
+      // iterating backwards over zombie_stack_locals).
+      var j = 0;
+      for (j = 0; j < stack_to_render.length; j++) {
+        if ($.inArray(stack_to_render[j].frame_id, entry.parent_frame_id_list) >= 0) {
+          continue;
+        }
+        break;
+      }
+
+      stack_to_render.splice(j, 0, entry);
+    }
+
+  }
+
+
+  $.each(stack_to_render, function(i, e) {
+    renderStackFrame(e, i, e.is_zombie);
+  });
+
+
+  // then render the heap
+
+  alreadyRenderedObjectIDs = {}; // set of object IDs that have already been rendered
+
+  // if addToEnd is true, then APPEND to the end of the heap,
+  // otherwise PREPEND to the front
+  function renderHeapObject(obj, addToEnd) {
+    var objectID = getObjectID(obj);
+
+    if (alreadyRenderedObjectIDs[objectID] === undefined) {
+      var toplevelHeapObjID = 'toplevel_heap_object_' + objectID;
+      var newDiv = '
';
+
+      if (addToEnd) {
+        $(vizDiv + ' #heap').append(newDiv);
+      }
+      else {
+        $(vizDiv + ' #heap').prepend(newDiv);
+      }
+      renderData(obj, $(vizDiv + ' #heap #' + toplevelHeapObjID), true);
+
+      alreadyRenderedObjectIDs[objectID] = 1;
+    }
+  }
+
+
+  // if there are multiple aliases to the same object, we want to render
+  // the one deepest in the stack, so that we can hopefully prevent
+  // objects from jumping around as functions are called and returned.
+  // e.g., if a list L appears as a global variable and as a local in a
+  // function, we want to render L when rendering the global frame.
+
+  // this is straightforward: just go through globals first and then
+  // each stack frame in order :)
+
+  $.each(curEntry.ordered_globals, function(i, varname) {
+    var val = curEntry.globals[varname];
+    if (!renderInline(val)) {
+      renderHeapObject(val, true); // APPEND
+    }
+  });
+
+
+  $.each(stack_to_render, function(i, frame) {
+    var localVars = frame.encoded_locals;
+
+    $.each(frame.ordered_varnames, function(i2, varname) {
+
+      // don't render return values for zombie frames
+      if (frame.is_zombie && varname == '__return__') {
+        return;
+      }
+
+      var val = localVars[varname];
+      if (!renderInline(val)) {
+        renderHeapObject(val, true); // APPEND
+      }
+    });
+  });
+
+  
+  // prepend heap header after all the dust settles:
+  $(vizDiv + ' #heap').prepend('
Objects
');
+
+
+  // finally connect stack variables to heap objects via connectors
+  for (varID in connectionEndpointIDs) {
+    var valueID = connectionEndpointIDs[varID];
+    jsPlumb.connect({source: varID, target: valueID});
+  }
+
+
+  function highlight_frame(frameID) {
+    var allConnections = jsPlumb.getConnections();
+    for (var i = 0; i < allConnections.length; i++) {
+      var c = allConnections[i];
+
+      // this is VERY VERY fragile code, since it assumes that going up
+      // five layers of parent() calls will get you from the source end
+      // of the connector to the enclosing stack frame
+      var stackFrameDiv = c.source.parent().parent().parent().parent().parent();
+
+      // if this connector starts in the selected stack frame ...
+      if (stackFrameDiv.attr('id') == frameID) {
+        // then HIGHLIGHT IT!
+        c.setPaintStyle({lineWidth:1, strokeStyle: darkBlue});
+        c.endpoints[0].setPaintStyle({fillStyle: darkBlue});
+        c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
+
+        // ... and move it to the VERY FRONT
+        $(c.canvas).css("z-index", 1000);
+      }
+      // for heap->heap connectors
+      else if (heapConnectionEndpointIDs[c.endpoints[0].elementId] !== undefined) {
+        // then HIGHLIGHT IT!
+        c.setPaintStyle({lineWidth:1, strokeStyle: darkBlue}); // make thinner
+        c.endpoints[0].setPaintStyle({fillStyle: darkBlue});
+        c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
+        //c.setConnector([ "Bezier", {curviness: 80} ]); // make it more curvy
+        c.setConnector([ "StateMachine" ]);
+        c.addOverlay([ "Arrow", { length: 10, width:7, foldback:0.55, location:1 }]);
+      }
+      else {
+        // else unhighlight it
+        c.setPaintStyle({lineWidth:1, strokeStyle: lightGray});
+        c.endpoints[0].setPaintStyle({fillStyle: lightGray});
+        c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
+        $(c.canvas).css("z-index", 0);
+      }
+    }
+
+    // clear everything, then just activate $(this) one ...
+    $(".stackFrame").removeClass("highlightedStackFrame");
+    $('#' + frameID).addClass("highlightedStackFrame");
+  }
+
+
+  // highlight the top-most non-zombie stack frame or, if not available, globals
+  var frame_already_highlighted = false;
+  $.each(stack_to_render, function(i, e) {
+    if (e.is_highlighted) {
+      highlight_frame('stack' + i);
+      frame_already_highlighted = true;
+    }
+  });
+
+  if (!frame_already_highlighted) {
+    highlight_frame('globals');
+  }
+
+}
+
+function isPrimitiveType(obj) {
+  var typ = typeof obj;
+  return ((obj == null) || (typ != "object"));
+}
+
+function getRefID(obj) {
+  assert(obj[0] == 'REF');
+  return obj[1];
+}
+
+/*
+function renderInline(obj) {
+  return isPrimitiveType(obj) && (typeof obj != 'string');
+}
+*/
+
+// Key is a primitive value (e.g., 'hello', 3.14159, true)
+// Value is a unique primitive ID (starting with 'p' to disambiguate
+// from regular object IDs)
+var primitive_IDs = {null: 'p0', true: 'p1', false: 'p2'};
+var cur_pID = 3;
+
+function getObjectID(obj) {
+  if (isPrimitiveType(obj)) {
+    // primitive objects get IDs starting with 'p' ...
+    // this renders aliases as 'interned' for simplicity
+    var pID = primitive_IDs[obj];
+    if (pID !== undefined) {
+      return pID;
+    }
+    else {
+      var new_pID = 'p' + cur_pID;
+      primitive_IDs[obj] = new_pID;
+      cur_pID++;
+      return new_pID;
+    }
+    return obj;
+  }
+  else {
+    assert($.isArray(obj));
+
+    if ((obj[0] == 'INSTANCE') || (obj[0] == 'CLASS')) {
+      return obj[2];
+    }
+    else {
+      return obj[1];
+    }
+  }
+}
+
+
+
+String.prototype.rtrim = function() {
+  return this.replace(/\s*$/g, "");
+}
+
+
+function renderPyCodeOutput(codeStr) {
+  clearSliderBreakpoints(); // start fresh!
+
+  var lines = codeStr.rtrim().split('\n');
+
+  // reset it!
+  codeOutputLines = [];
+  $.each(lines, function(i, cod) {
+    var n = {};
+    n.text = cod;
+    n.lineNumber = i + 1;
+    n.executionPoints = [];
+    n.backgroundColor = null;
+    n.breakpointHere = false;
+
+
+    $.each(curTrace, function(i, elt) {
+      if (elt.line == n.lineNumber) {
+        n.executionPoints.push(i);
+      }
+    });
+
+
+    // if there is a comment containing 'breakpoint' and this line was actually executed,
+    // then set a breakpoint on this line
+    var breakpointInComment = false;
+    toks = cod.split('#');
+    for (var j = 1 /* start at index 1, not 0 */; j < toks.length; j++) {
+      if (toks[j].indexOf('breakpoint') != -1) {
+        breakpointInComment = true;
+      }
+    }
+
+    if (breakpointInComment && n.executionPoints.length > 0) {
+      n.breakpointHere = true;
+      addToBreakpoints(n.executionPoints);
+    }
+
+    codeOutputLines.push(n);
+  });
+
+
+  $("#pyCodeOutputDiv").empty(); // jQuery empty() is better than .html('')
+
+
+  // maps codeOutputLines to both table columns
+  d3.select('#pyCodeOutputDiv')
+    .append('table')
+    .attr('id', 'pyCodeOutput')
+    .selectAll('tr')
+    .data(codeOutputLines)
+    .enter().append('tr')
+    .selectAll('td')
+    .data(function(e, i){return [e, e];}) // bind an alias of the element to both table columns
+    .enter().append('td')
+    .attr('class', function(d, i) {return (i == 0) ? 'lineNo' : 'cod';})
+    .style('cursor', function(d, i) {return 'pointer'})
+    .html(function(d, i) {
+      if (i == 0) {
+        return d.lineNumber;
+      }
+      else {
+        return htmlspecialchars(d.text);
+      }
+     })
+    .on('mouseover', function() {
+      setBreakpoint(this);
+     })
+    .on('mouseout', function() {
+      var breakpointHere = d3.select(this).datum().breakpointHere;
+
+      if (!breakpointHere) {
+        unsetBreakpoint(this);
+      }
+     })
+    .on('mousedown', function() {
+      // don't do anything if exePts is empty
+      // (i.e., this line was never executed)
+      var exePts = d3.select(this).datum().executionPoints;
+      if (!exePts || exePts.length == 0) {
+        return;
+      }
+
+      // toggle breakpoint
+      d3.select(this).datum().breakpointHere = !d3.select(this).datum().breakpointHere;
+
+      var breakpointHere = d3.select(this).datum().breakpointHere;
+      if (breakpointHere) {
+        setBreakpoint(this);
+      }
+      else {
+        unsetBreakpoint(this);
+      }
+     });
+
+  renderSliderBreakpoints(); // renders breakpoints written in as code comments
+}
+
+
+
+var breakpointLines = {}; // set of lines to set as breakpoints
+var sortedBreakpointsList = []; // sorted and synced with breakpointLines
+
+
+function _getSortedBreakpointsList() {
+  var ret = [];
+  for (var k in breakpointLines) {
+    ret.push(Number(k)); // these should be NUMBERS, not strings
+  }
+  ret.sort(function(x,y){return x-y}); // WTF, javascript sort is lexicographic by default!
+  return ret;
+}
+
+function addToBreakpoints(executionPoints) {
+  $.each(executionPoints, function(i, e) {
+    breakpointLines[e] = 1;
+  });
+
+  sortedBreakpointsList = _getSortedBreakpointsList();
+}
+
+function removeFromBreakpoints(executionPoints) {
+  $.each(executionPoints, function(i, e) {
+    delete breakpointLines[e];
+  });
+
+  sortedBreakpointsList = _getSortedBreakpointsList();
+}
+
+// find the previous/next breakpoint to c or return -1 if it doesn't exist
+function findPrevBreakpoint(c) {
+  if (sortedBreakpointsList.length == 0) {
+    return -1;
+  }
+  else {
+    for (var i = 1; i < sortedBreakpointsList.length; i++) {
+      var prev = sortedBreakpointsList[i-1];
+      var cur = sortedBreakpointsList[i];
+
+      if (c <= prev) {
+        return -1;
+      }
+
+      if (cur >= c) {
+        return prev;
+      }
+    }
+
+    // final edge case:
+    var lastElt = sortedBreakpointsList[sortedBreakpointsList.length - 1];
+    return (lastElt < c) ? lastElt : -1;
+  }
+}
+
+function findNextBreakpoint(c) {
+  if (sortedBreakpointsList.length == 0) {
+    return -1;
+  }
+  else {
+    for (var i = 0; i < sortedBreakpointsList.length - 1; i++) {
+      var cur = sortedBreakpointsList[i];
+      var next = sortedBreakpointsList[i+1];
+
+      if (c < cur) {
+        return cur;
+      }
+
+      if (cur <= c && c < next) { // subtle
+        return next;
+      }
+    }
+
+    // final edge case:
+    var lastElt = sortedBreakpointsList[sortedBreakpointsList.length - 1];
+    return (lastElt > c) ? lastElt : -1;
+  }
+}
+
+
+function setBreakpoint(t) {
+  var exePts = d3.select(t).datum().executionPoints;
+
+  // don't do anything if exePts is empty
+  // (i.e., this line was never executed)
+  if (!exePts || exePts.length == 0) {
+    return;
+  }
+
+  addToBreakpoints(exePts);
+
+  d3.select(t.parentNode).select('td.lineNo').style('color', breakpointColor);
+  d3.select(t.parentNode).select('td.lineNo').style('font-weight', 'bold');
+
+  renderSliderBreakpoints();
+}
+
+function unsetBreakpoint(t) {
+  var exePts = d3.select(t).datum().executionPoints;
+
+  // don't do anything if exePts is empty
+  // (i.e., this line was never executed)
+  if (!exePts || exePts.length == 0) {
+    return;
+  }
+
+  removeFromBreakpoints(exePts);
+
+
+  var lineNo = d3.select(t).datum().lineNumber;
+
+  if (visitedLinesSet[lineNo]) {
+    d3.select(t.parentNode).select('td.lineNo').style('color', visitedLineColor);
+    d3.select(t.parentNode).select('td.lineNo').style('font-weight', 'bold');
+  }
+  else {
+    d3.select(t.parentNode).select('td.lineNo').style('color', '');
+    d3.select(t.parentNode).select('td.lineNo').style('font-weight', '');
+  }
+
+  renderSliderBreakpoints();
+}
+
+
+// depends on sortedBreakpointsList global
+function renderSliderBreakpoints() {
+  $("#executionSliderFooter").empty(); // jQuery empty() is better than .html('')
+
+  // I originally didn't want to delete and re-create this overlay every time,
+  // but if I don't do so, there are weird flickering artifacts with clearing
+  // the SVG container; so it's best to just delete and re-create the container each time
+  var sliderOverlay = d3.select('#executionSliderFooter')
+    .append('svg')
+    .attr('id', 'sliderOverlay')
+    .attr('width', $('#executionSlider').width())
+    .attr('height', 12);
+
+  var xrange = d3.scale.linear()
+    .domain([0, curTrace.length - 1])
+    .range([0, $('#executionSlider').width()]);
+
+  sliderOverlay.selectAll('rect')
+      .data(sortedBreakpointsList)
+    .enter().append('rect')
+      .attr('x', function(d, i) {
+        // make the edge cases look decent
+        if (d == 0) {
+          return 0;
+        }
+        else {
+          return xrange(d) - 3;
+        }
+      })
+      .attr('y', 0)
+      .attr('width', 2)
+      .attr('height', 12);
+}
+
+
+function clearSliderBreakpoints() {
+  breakpointLines = {};
+  sortedBreakpointsList = [];
+  renderSliderBreakpoints();
+}
+
+
+
+// initialization function that should be called when the page is loaded
+function eduPythonCommonInit() {
+  // set some sensible jsPlumb defaults
+  jsPlumb.Defaults.Endpoint = ["Dot", {radius:3}];
+  //jsPlumb.Defaults.Endpoint = ["Rectangle", {width:3, height:3}];
+  jsPlumb.Defaults.EndpointStyle = {fillStyle: lightGray};
+
+  jsPlumb.Defaults.Anchors = ["RightMiddle", "LeftMiddle"]; // for aesthetics!
+
+  jsPlumb.Defaults.PaintStyle = {lineWidth:1, strokeStyle: lightGray};
+
+  // bezier curve style:
+  //jsPlumb.Defaults.Connector = [ "Bezier", { curviness:15 }]; /* too much 'curviness' causes lines to run together */
+  //jsPlumb.Defaults.Overlays = [[ "Arrow", { length: 14, width:10, foldback:0.55, location:0.35 }]]
+
+  // state machine curve style:
+  jsPlumb.Defaults.Connector = [ "StateMachine" ];
+  jsPlumb.Defaults.Overlays = [[ "Arrow", { length: 10, width:7, foldback:0.55, location:1 }]];
+
+
+  jsPlumb.Defaults.EndpointHoverStyle = {fillStyle: pinkish};
+  jsPlumb.Defaults.HoverPaintStyle = {lineWidth:2, strokeStyle: pinkish};
+
+
+  // set keyboard event listeners ...
+  $(document).keydown(function(k) {
+    // ONLY capture keys if we're in 'visualize code' mode:
+    if (appMode == 'visualize' && !keyStuckDown) {
+      if (k.keyCode == 37) { // left arrow
+        if (curInstr > 0) {
+          // if there is a prev breakpoint, then jump to it ...
+          if (sortedBreakpointsList.length > 0) {
+            var prevBreakpoint = findPrevBreakpoint(curInstr);
+            if (prevBreakpoint != -1) {
+              curInstr = prevBreakpoint;
+            }
+          }
+          else {
+            curInstr -= 1;
+          }
+          updateOutput();
+        }
+
+        k.preventDefault(); // don't horizontally scroll the display
+
+        keyStuckDown = true;
+      }
+      else if (k.keyCode == 39) { // right arrow
+        if (curInstr < curTrace.length - 1) {
+          // if there is a next breakpoint, then jump to it ...
+          if (sortedBreakpointsList.length > 0) {
+            var nextBreakpoint = findNextBreakpoint(curInstr);
+            if (nextBreakpoint != -1) {
+              curInstr = nextBreakpoint;
+            }
+          }
+          else {
+            curInstr += 1;
+          }
+          updateOutput();
+        }
+
+        k.preventDefault(); // don't horizontally scroll the display
+
+        keyStuckDown = true;
+      }
+    }
+  });
+
+  $(document).keyup(function(k) {
+    keyStuckDown = false;
+  });
+
+
+  // redraw everything on window resize so that connectors are in the
+  // right place
+  // TODO: can be SLOW on older browsers!!!
+  $(window).resize(function() {
+    if (appMode == 'visualize') {
+      updateOutput();
+    }
+  });
+
+  $("#classicModeCheckbox").click(function() {
+    if (appMode == 'visualize') {
+      updateOutput();
+    }
+  });
+
+
+  // log a generic AJAX error handler
+  $(document).ajaxError(function() {
+    alert("Uh oh, the server returned an error, boo :(  Please reload the page and try executing a different Python script.");
+  });
+
+}
+
diff --git a/PyTutorGAE/js/jquery-1.3.2.min.js b/PyTutorGAE/js/jquery-1.3.2.min.js
new file mode 100644
index 000000000..b1ae21d8b
--- /dev/null
+++ b/PyTutorGAE/js/jquery-1.3.2.min.js
@@ -0,0 +1,19 @@
+/*
+ * jQuery JavaScript Library v1.3.2
+ * http://jquery.com/
+ *
+ * Copyright (c) 2009 John Resig
+ * Dual licensed under the MIT and GPL licenses.
+ * http://docs.jquery.com/License
+ *
+ * Date: 2009-02-19 17:34:21 -0500 (Thu, 19 Feb 2009)
+ * Revision: 6246
+ */
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diff --git a/PyTutorGAE/js/jquery-ui-1.8.21.custom.min.js b/PyTutorGAE/js/jquery-ui-1.8.21.custom.min.js
new file mode 100644
index 000000000..e060fdcf4
--- /dev/null
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@@ -0,0 +1,21 @@
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\ No newline at end of file
diff --git a/PyTutorGAE/js/jquery.ba-bbq.min.js b/PyTutorGAE/js/jquery.ba-bbq.min.js
new file mode 100644
index 000000000..bcbf24834
--- /dev/null
+++ b/PyTutorGAE/js/jquery.ba-bbq.min.js
@@ -0,0 +1,18 @@
+/*
+ * jQuery BBQ: Back Button & Query Library - v1.2.1 - 2/17/2010
+ * http://benalman.com/projects/jquery-bbq-plugin/
+ * 
+ * Copyright (c) 2010 "Cowboy" Ben Alman
+ * Dual licensed under the MIT and GPL licenses.
+ * http://benalman.com/about/license/
+ */
+(function($,p){var i,m=Array.prototype.slice,r=decodeURIComponent,a=$.param,c,l,v,b=$.bbq=$.bbq||{},q,u,j,e=$.event.special,d="hashchange",A="querystring",D="fragment",y="elemUrlAttr",g="location",k="href",t="src",x=/^.*\?|#.*$/g,w=/^.*\#/,h,C={};function E(F){return typeof F==="string"}function B(G){var F=m.call(arguments,1);return function(){return G.apply(this,F.concat(m.call(arguments)))}}function n(F){return F.replace(/^[^#]*#?(.*)$/,"$1")}function o(F){return F.replace(/(?:^[^?#]*\?([^#]*).*$)?.*/,"$1")}function f(H,M,F,I,G){var O,L,K,N,J;if(I!==i){K=F.match(H?/^([^#]*)\#?(.*)$/:/^([^#?]*)\??([^#]*)(#?.*)/);J=K[3]||"";if(G===2&&E(I)){L=I.replace(H?w:x,"")}else{N=l(K[2]);I=E(I)?l[H?D:A](I):I;L=G===2?I:G===1?$.extend({},I,N):$.extend({},N,I);L=a(L);if(H){L=L.replace(h,r)}}O=K[1]+(H?"#":L||!K[1]?"?":"")+L+J}else{O=M(F!==i?F:p[g][k])}return O}a[A]=B(f,0,o);a[D]=c=B(f,1,n);c.noEscape=function(G){G=G||"";var F=$.map(G.split(""),encodeURIComponent);h=new RegExp(F.join("|"),"g")};c.noEscape(",/");$.deparam=l=function(I,F){var H={},G={"true":!0,"false":!1,"null":null};$.each(I.replace(/\+/g," ").split("&"),function(L,Q){var K=Q.split("="),P=r(K[0]),J,O=H,M=0,R=P.split("]["),N=R.length-1;if(/\[/.test(R[0])&&/\]$/.test(R[N])){R[N]=R[N].replace(/\]$/,"");R=R.shift().split("[").concat(R);N=R.length-1}else{N=0}if(K.length===2){J=r(K[1]);if(F){J=J&&!isNaN(J)?+J:J==="undefined"?i:G[J]!==i?G[J]:J}if(N){for(;M<=N;M++){P=R[M]===""?O.length:R[M];O=O[P]=M').hide().insertAfter("body")[0].contentWindow;q=function(){return a(n.document[c][l])};o=function(u,s){if(u!==s){var t=n.document;t.open().close();t[c].hash="#"+u}};o(a())}}m.start=function(){if(r){return}var t=a();o||p();(function s(){var v=a(),u=q(t);if(v!==t){o(t=v,u);$(i).trigger(d)}else{if(u!==t){i[c][l]=i[c][l].replace(/#.*/,"")+"#"+u}}r=setTimeout(s,$[d+"Delay"])})()};m.stop=function(){if(!n){r&&clearTimeout(r);r=0}};return m})()})(jQuery,this);
\ No newline at end of file
diff --git a/PyTutorGAE/js/jquery.jsPlumb-1.3.10-all-min.js b/PyTutorGAE/js/jquery.jsPlumb-1.3.10-all-min.js
new file mode 100644
index 000000000..3171abe1b
--- /dev/null
+++ b/PyTutorGAE/js/jquery.jsPlumb-1.3.10-all-min.js
@@ -0,0 +1 @@
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bJ=p.CurrentLibrary.getOffset(bB);bw[bE][bz]={id:bz,offset:{left:bJ.left-bC.left,top:bJ.top-bC.top}}}break}bA=bA.parentNode}};this.endpointDeleted=function(bA){if(bv[bA.elementId]){bv[bA.elementId]--;if(bv[bA.elementId]<=0){for(var bz in bw){delete bw[bz][bA.elementId]}}}};this.getElementsForDraggable=function(bz){return bw[bz]};this.reset=function(){by={};bx=[];bw={};bv={}}};bn.dragManager=new aV();var ax=function(bN){var bG=this,bx=true;bG.idPrefix="_jsplumb_c_";bG.defaultLabelLocation=0.5;bG.defaultOverlayKeys=["Overlays","ConnectionOverlays"];this.parent=bN.parent;z.apply(this,arguments);this.isVisible=function(){return bx};this.setVisible=function(bP){bx=bP;bG[bP?"showOverlays":"hideOverlays"]();if(bG.connector&&bG.connector.canvas){bG.connector.canvas.style.display=bP?"block":"none"}};this.source=F(bN.source);this.target=F(bN.target);if(bN.sourceEndpoint){this.source=bN.sourceEndpoint.endpointWillMoveTo||bN.sourceEndpoint.getElement()}if(bN.targetEndpoint){this.target=bN.targetEndpoint.getElement()}bG.previousConnection=bN.previousConnection;var bD=bN.cost;bG.getCost=function(){return bD};bG.setCost=function(bP){bD=bP};var bB=bN.bidirectional===false?false:true;bG.isBidirectional=function(){return bB};this.sourceId=d(this.source,"id");this.targetId=d(this.target,"id");this.getAttachedElements=function(){return bG.endpoints};this.scope=bN.scope;this.endpoints=[];this.endpointStyles=[];var bM=function(bQ,bP){if(bQ){return bn.makeAnchor(bQ,bP,bn)}},bK=function(bP,bV,bQ,bS,bT,bR,bU){if(bP){bG.endpoints[bV]=bP;bP.addConnection(bG)}else{if(!bQ.endpoints){bQ.endpoints=[null,null]}var b1=bQ.endpoints[bV]||bQ.endpoint||bn.Defaults.Endpoints[bV]||p.Defaults.Endpoints[bV]||bn.Defaults.Endpoint||p.Defaults.Endpoint;if(!bQ.endpointStyles){bQ.endpointStyles=[null,null]}if(!bQ.endpointHoverStyles){bQ.endpointHoverStyles=[null,null]}var bZ=bQ.endpointStyles[bV]||bQ.endpointStyle||bn.Defaults.EndpointStyles[bV]||p.Defaults.EndpointStyles[bV]||bn.Defaults.EndpointStyle||p.Defaults.EndpointStyle;if(bZ.fillStyle==null&&bR!=null){bZ.fillStyle=bR.strokeStyle}if(bZ.outlineColor==null&&bR!=null){bZ.outlineColor=bR.outlineColor}if(bZ.outlineWidth==null&&bR!=null){bZ.outlineWidth=bR.outlineWidth}var bY=bQ.endpointHoverStyles[bV]||bQ.endpointHoverStyle||bn.Defaults.EndpointHoverStyles[bV]||p.Defaults.EndpointHoverStyles[bV]||bn.Defaults.EndpointHoverStyle||p.Defaults.EndpointHoverStyle;if(bU!=null){if(bY==null){bY={}}if(bY.fillStyle==null){bY.fillStyle=bU.strokeStyle}}var bX=bQ.anchors?bQ.anchors[bV]:bQ.anchor?bQ.anchor:bM(bn.Defaults.Anchors[bV],bT)||bM(p.Defaults.Anchors[bV],bT)||bM(bn.Defaults.Anchor,bT)||bM(p.Defaults.Anchor,bT),b0=bQ.uuids?bQ.uuids[bV]:null,bW=aF({paintStyle:bZ,hoverPaintStyle:bY,endpoint:b1,connections:[bG],uuid:b0,anchor:bX,source:bS,scope:bQ.scope,container:bQ.container,reattach:bQ.reattach,detachable:bQ.detachable});bG.endpoints[bV]=bW;if(bQ.drawEndpoints===false){bW.setVisible(false,true,true)}return bW}};var bI=bK(bN.sourceEndpoint,0,bN,bG.source,bG.sourceId,bN.paintStyle,bN.hoverPaintStyle);if(bI){V(aT,this.sourceId,bI)}var by=((bG.sourceId==bG.targetId)&&bN.targetEndpoint==null)?bI:bN.targetEndpoint,bH=bK(by,1,bN,bG.target,bG.targetId,bN.paintStyle,bN.hoverPaintStyle);if(bH){V(aT,this.targetId,bH)}if(!this.scope){this.scope=this.endpoints[0].scope}if(bN.deleteEndpointsOnDetach){bG.endpointsToDeleteOnDetach=[bI,bH]}var bw=bn.Defaults.ConnectionsDetachable;if(bN.detachable===false){bw=false}if(bG.endpoints[0].connectionsDetachable===false){bw=false}if(bG.endpoints[1].connectionsDetachable===false){bw=false}if(bD==null){bD=bG.endpoints[0].getConnectionCost()}if(bN.bidirectional==null){bB=bG.endpoints[0].areConnectionsBidirectional()}this.isDetachable=function(){return bw===true};this.setDetachable=function(bP){bw=bP===true};var bO=p.extend({},this.endpoints[0].getParameters());p.extend(bO,this.endpoints[1].getParameters());p.extend(bO,bG.getParameters());bG.setParameters(bO);var bE=bG.setHover;bG.setHover=function(bP){bG.connector.setHover.apply(bG.connector,arguments);bE.apply(bG,arguments)};var bL=function(bP){if(x==null){bG.setHover(bP,false)}};this.setConnector=function(bP,bQ){if(bG.connector!=null){aX(bG.connector.getDisplayElements(),bG.parent)}var bR={_jsPlumb:bG._jsPlumb,parent:bN.parent,cssClass:bN.cssClass,container:bN.container,tooltip:bG.tooltip};if(C(bP)){this.connector=new p.Connectors[X][bP](bR)}else{if(n(bP)){this.connector=new p.Connectors[X][bP[0]](p.extend(bP[1],bR))}}bG.canvas=bG.connector.canvas;G(bG.connector,bG,bL);if(!bQ){bG.repaint()}};bG.setConnector(this.endpoints[0].connector||this.endpoints[1].connector||bN.connector||bn.Defaults.Connector||p.Defaults.Connector,true);this.setPaintStyle(this.endpoints[0].connectorStyle||this.endpoints[1].connectorStyle||bN.paintStyle||bn.Defaults.PaintStyle||p.Defaults.PaintStyle,true);this.setHoverPaintStyle(this.endpoints[0].connectorHoverStyle||this.endpoints[1].connectorHoverStyle||bN.hoverPaintStyle||bn.Defaults.HoverPaintStyle||p.Defaults.HoverPaintStyle,true);this.paintStyleInUse=this.getPaintStyle();this.moveParent=function(bS){var bR=p.CurrentLibrary,bQ=bR.getParent(bG.connector.canvas);if(bG.connector.bgCanvas){bR.removeElement(bG.connector.bgCanvas,bQ);bR.appendElement(bG.connector.bgCanvas,bS)}bR.removeElement(bG.connector.canvas,bQ);bR.appendElement(bG.connector.canvas,bS);for(var bP=0;bP0){bO.connections[0].setHover(b2,false)}else{bO.setHover(b2)}};G(bO.endpoint,bO,b1);this.setPaintStyle(b0.paintStyle||b0.style||bn.Defaults.EndpointStyle||p.Defaults.EndpointStyle,true);this.setHoverPaintStyle(b0.hoverPaintStyle||bn.Defaults.EndpointHoverStyle||p.Defaults.EndpointHoverStyle,true);this.paintStyleInUse=this.getPaintStyle();var bJ=this.getPaintStyle();this.connectorStyle=b0.connectorStyle;this.connectorHoverStyle=b0.connectorHoverStyle;this.connectorOverlays=b0.connectorOverlays;this.connector=b0.connector;this.connectorTooltip=b0.connectorTooltip;this.isSource=b0.isSource||false;this.isTarget=b0.isTarget||false;var bU=b0.maxConnections||bn.Defaults.MaxConnections;this.getAttachedElements=function(){return bO.connections};this.canvas=this.endpoint.canvas;this.connections=b0.connections||[];this.scope=b0.scope||Q;this.timestamp=null;bO.isReattach=b0.reattach||false;bO.connectionsDetachable=bn.Defaults.ConnectionsDetachable;if(b0.connectionsDetachable===false||b0.detachable===false){bO.connectionsDetachable=false}var bI=b0.dragAllowedWhenFull||true;this.computeAnchor=function(b2){return bO.anchor.compute(b2)};this.addConnection=function(b2){bO.connections.push(b2)};this.detach=function(b3,b8,b4,cb,b2){var ca=i(bO.connections,function(cd){return cd.id==b3.id}),b9=false;cb=(cb!==false);if(ca>=0){if(b4||b3._forceDetach||b3.isDetachable()||b3.isDetachAllowed(b3)){var cc=b3.endpoints[0]==bO?b3.endpoints[1]:b3.endpoints[0];if(b4||b3._forceDetach||(bO.isDetachAllowed(b3))){bO.connections.splice(ca,1);if(!b8){cc.detach(b3,true,b4);if(b3.endpointsToDeleteOnDetach){for(var b7=0;b70){bO.detach(bO.connections[0],false,true,b3,b2)}};this.detachFrom=function(b5,b4,b2){var b6=[];for(var b3=0;b3=0){bO.connections.splice(b2,1)}};this.getElement=function(){return bN};this.setElement=function(b5,b2){var b7=K(b5);D(aT[bO.elementId],function(b8){return b8.id==bO.id});bN=F(b5);bF=K(bN);bO.elementId=bF;var b6=aw({source:b7,container:b2}),b4=bz.getParent(bO.canvas);bz.removeElement(bO.canvas,b4);bz.appendElement(bO.canvas,b6);for(var b3=0;b30){var ce=bK(b5.elementWithPrecedence),cg=ce.endpoints[0]==bO?1:0,b7=cg==0?ce.sourceId:ce.targetId,cd=ah[b7],cf=ae[b7];b4.txy=[cd.left,cd.top];b4.twh=cf;b4.tElement=ce.endpoints[cg]}b8=bO.anchor.compute(b4)}var cc=bL.compute(b8,bO.anchor.getOrientation(bO),bO.paintStyleInUse,b6||bO.paintStyleInUse);bL.paint(cc,bO.paintStyleInUse,bO.anchor);bO.timestamp=cb;for(var b9=0;b90?t:m+t:t*m;return jsPlumbUtil.pointOnLine({x:h,y:g},{x:d,y:c},s)}}};this.gradientAtPoint=function(s){return e};this.pointAlongPathFrom=function(s,w,v){var u=r.pointOnPath(s,v),t=s==1?{x:h+((d-h)*10),y:g+((g-c)*10)}:{x:d,y:c};return jsPlumbUtil.pointOnLine(u,t,w)}};jsPlumb.Connectors.Bezier=function(v){var p=this;v=v||{};this.majorAnchor=v.curviness||150;this.minorAnchor=10;var t=null;this.type="Bezier";this._findControlPoint=function(H,w,C,x,A,F,y){var E=F.getOrientation(x),G=y.getOrientation(A),B=E[0]!=G[0]||E[1]==G[1],z=[],I=p.majorAnchor,D=p.minorAnchor;if(!B){if(E[0]==0){z.push(w[0]u){u=C}if(F<0){s+=F;var H=Math.abs(F);u+=H;q[0]+=H;f+=H;o+=H;l[0]+=H}var P=Math.min(e,n),N=Math.min(q[1],l[1]),B=Math.min(P,N),G=Math.max(e,n),E=Math.max(q[1],l[1]),y=Math.max(G,E);if(y>d){d=y}if(B<0){r+=B;var D=Math.abs(B);d+=D;q[1]+=D;e+=D;n+=D;l[1]+=D}if(L&&u0?0:1,w)}return w};this.pointOnPath=function(w,y){var x=c();w=m(x,w,y);return jsBezier.pointOnCurve(x,w)};this.gradientAtPoint=function(w,y){var x=c();w=m(x,w,y);return jsBezier.gradientAtPoint(x,w)};this.pointAlongPathFrom=function(w,z,y){var x=c();w=m(x,w,y);return jsBezier.pointAlongCurveFrom(x,w,z)}};jsPlumb.Connectors.Flowchart=function(v){this.type="Flowchart";v=v||{};var n=this,c=v.stub||v.minStubLength||30,f=jsPlumbUtil.isArray(c)?c[0]:c,k=jsPlumbUtil.isArray(c)?c[1]:c,p=v.gap||0,q=[],i=0,d=[],m=[],r=[],o,l,u=-Infinity,s=-Infinity,w=Infinity,t=Infinity,x=function(z,y,D,C){var B=0;for(var A=0;A0?A/i:(i+A)/i}var y=d.length-1,z=1;for(var B=0;B=A){y=B;z=(A-d[B][0])/m[B];break}}return{segment:q[y],proportion:z,index:y}};this.compute=function(W,ak,z,Q,av,K,U,P,ap,am){q=[];d=[];i=0;m=[];u=s=-Infinity;w=t=Infinity;o=ak[0]au?0:1,ae=[1,0][ac];N=[];aw=[];N[ac]=W[ac]>ak[ac]?-1:1;aw[ac]=W[ac]>ak[ac]?1:-1;N[ae]=0;aw[ae]=0}if(al(f+k),X=Math.abs(H-aq)>(f+k),ah=Z+((L-Z)/2),af=Y+((J-Y)/2),O=((N[0]*aw[0])+(N[1]*aw[1])),ab=O==-1,ad=O==0,C=O==1;aj-=E;ai-=D;r=[aj,ai,al,au,I,H,ar,aq];var ao=[];var S=N[0]==0?"y":"x",M=ab?"opposite":C?"orthogonal":"perpendicular",F=jsPlumbUtil.segment([I,H],[ar,aq]),ag=N[S=="x"?0:1]==-1,R={x:[null,4,3,2,1],y:[null,2,1,4,3]};if(ag){F=R[S][F]}g(Z,Y,I,H,ar,aq);var T=function(az,ay,y,ax){return az+(ay*((1-y)*ax)+Math.max(f,k))},G={oppositex:function(){if(z.elementId==Q.elementId){var y=Y+((1-av.y)*ap.height)+Math.max(f,k);return[[Z,y],[L,y]]}else{if(V&&(F==1||F==2)){return[[ah,H],[ah,aq]]}else{return[[Z,af],[L,af]]}}},orthogonalx:function(){if(F==1||F==2){return[[L,Y]]}else{return[[Z,J]]}},perpendicularx:function(){var y=(aq+H)/2;if((F==1&&aw[1]==1)||(F==2&&aw[1]==-1)){if(Math.abs(ar-I)>Math.max(f,k)){return[[L,Y]]}else{return[[Z,Y],[Z,y],[L,y]]}}else{if((F==3&&aw[1]==-1)||(F==4&&aw[1]==1)){return[[Z,y],[L,y]]}else{if((F==3&&aw[1]==1)||(F==4&&aw[1]==-1)){return[[Z,J]]}else{if((F==1&&aw[1]==-1)||(F==2&&aw[1]==1)){if(Math.abs(ar-I)>Math.max(f,k)){return[[ah,Y],[ah,J]]}else{return[[Z,J]]}}}}}},oppositey:function(){if(z.elementId==Q.elementId){var y=Z+((1-av.x)*ap.width)+Math.max(f,k);return[[y,Y],[y,J]]}else{if(X&&(F==2||F==3)){return[[I,af],[ar,af]]}else{return[[ah,Y],[ah,J]]}}},orthogonaly:function(){if(F==2||F==3){return[[Z,J]]}else{return[[L,Y]]}},perpendiculary:function(){var y=(ar+I)/2;if((F==2&&aw[0]==-1)||(F==3&&aw[0]==1)){if(Math.abs(ar-I)>Math.max(f,k)){return[[Z,J]]}else{return[[Z,af],[L,af]]}}else{if((F==1&&aw[0]==-1)||(F==4&&aw[0]==1)){var y=(ar+I)/2;return[[y,Y],[y,J]]}else{if((F==1&&aw[0]==1)||(F==4&&aw[0]==-1)){return[[L,Y]]}else{if((F==2&&aw[0]==1)||(F==3&&aw[0]==-1)){if(Math.abs(aq-H)>Math.max(f,k)){return[[Z,af],[L,af]]}else{return[[L,Y]]}}}}}}};var an=G[M+S]();if(an){for(var at=0;atr[3]){r[3]=s+(U*2)}if(u>r[2]){r[2]=u+(U*2)}return r};this.pointOnPath=function(y,z){return n.pointAlongPathFrom(y,0,z)};this.gradientAtPoint=function(y,z){return q[e(y,z)["index"]][4]};this.pointAlongPathFrom=function(F,y,E){var G=e(F,E),C=G.segment,z=G.proportion,B=q[G.index][5],A=q[G.index][4];var 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\ No newline at end of file
diff --git a/PyTutorGAE/pg_encoder.py b/PyTutorGAE/pg_encoder.py
new file mode 100644
index 000000000..0445ae03c
--- /dev/null
+++ b/PyTutorGAE/pg_encoder.py
@@ -0,0 +1,174 @@
+# Online Python Tutor
+# https://github.com/pgbovine/OnlinePythonTutor/
+# 
+# Copyright (C) 2010-2012 Philip J. Guo (philip@pgbovine.net)
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+# Given an arbitrary piece of Python data, encode it in such a manner
+# that it can be later encoded into JSON.
+#   http://json.org/
+#
+# We use this function to encode run-time traces of data structures
+# to send to the front-end.
+#
+# Format:
+#   Primitives:
+#   * None, int, long, float, str, bool - unchanged
+#     (json.dumps encodes these fine verbatim)
+#
+#   Compound objects:
+#   * list     - ['LIST', elt1, elt2, elt3, ..., eltN]
+#   * tuple    - ['TUPLE', elt1, elt2, elt3, ..., eltN]
+#   * set      - ['SET', elt1, elt2, elt3, ..., eltN]
+#   * dict     - ['DICT', [key1, value1], [key2, value2], ..., [keyN, valueN]]
+#   * instance - ['INSTANCE', class name, [attr1, value1], [attr2, value2], ..., [attrN, valueN]]
+#   * class    - ['CLASS', class name, [list of superclass names], [attr1, value1], [attr2, value2], ..., [attrN, valueN]]
+#   * function - ['FUNCTION', function name, parent frame ID (for nested functions)]
+#   * other    - [, string representation of object]
+#   * compound object reference - ['REF', target object's unique_id]
+#
+# the unique_id is derived from id(), which allows us to capture aliasing
+
+
+import re, types
+typeRE = re.compile("")
+classRE = re.compile("")
+
+import inspect
+
+
+# Note that this might BLOAT MEMORY CONSUMPTION since we're holding on
+# to every reference ever created by the program without ever releasing
+# anything!
+class ObjectEncoder:
+  def __init__(self):
+    # Key: canonicalized small ID
+    # Value: encoded (compound) heap object
+    self.encoded_heap_objects = {}
+
+    self.id_to_small_IDs = {}
+    self.cur_small_ID = 1
+
+
+  def get_heap(self):
+    return self.encoded_heap_objects
+
+
+  def reset_heap(self):
+    # VERY IMPORTANT to reassign to an empty dict rather than just
+    # clearing the existing dict, since get_heap() could have been
+    # called earlier to return a reference to a previous heap state
+    self.encoded_heap_objects = {}
+
+  def set_function_parent_frame_ID(self, ref_obj, enclosing_frame_id):
+    assert ref_obj[0] == 'REF'
+    func_obj = self.encoded_heap_objects[ref_obj[1]]
+    assert func_obj[0] == 'FUNCTION'
+    func_obj[-1] = enclosing_frame_id
+
+
+  # return either a primitive object or an object reference;
+  # and as a side effect, update encoded_heap_objects
+  def encode(self, dat):
+    # primitive type
+    if dat is None or \
+       type(dat) in (int, long, float, str, bool):
+      return dat
+
+    # compound type - return an object reference and update encoded_heap_objects
+    else:
+      my_id = id(dat)
+
+      try:
+        my_small_id = self.id_to_small_IDs[my_id]
+      except KeyError:
+        my_small_id = self.cur_small_ID
+        self.id_to_small_IDs[my_id] = self.cur_small_ID
+        self.cur_small_ID += 1
+
+      del my_id # to prevent bugs later in this function
+
+      ret = ['REF', my_small_id]
+
+      # punt early if you've already encoded this object
+      if my_small_id in self.encoded_heap_objects:
+        return ret
+
+
+      # major side-effect!
+      new_obj = []
+      self.encoded_heap_objects[my_small_id] = new_obj
+
+      typ = type(dat)
+
+      if typ == list:
+        new_obj.append('LIST')
+        for e in dat: new_obj.append(self.encode(e))
+      elif typ == tuple:
+        new_obj.append('TUPLE')
+        for e in dat: new_obj.append(self.encode(e))
+      elif typ == set:
+        new_obj.append('SET')
+        for e in dat: new_obj.append(self.encode(e))
+      elif typ == dict:
+        new_obj.append('DICT')
+        for (k, v) in dat.iteritems():
+          # don't display some built-in locals ...
+          if k not in ('__module__', '__return__'):
+            new_obj.append([self.encode(k), self.encode(v)])
+
+      elif typ in (types.InstanceType, types.ClassType, types.TypeType) or \
+           classRE.match(str(typ)):
+        # ugh, classRE match is a bit of a hack :(
+        if typ == types.InstanceType or classRE.match(str(typ)):
+          new_obj.extend(['INSTANCE', dat.__class__.__name__])
+        else:
+          superclass_names = [e.__name__ for e in dat.__bases__]
+          new_obj.extend(['CLASS', dat.__name__, superclass_names])
+
+        # traverse inside of its __dict__ to grab attributes
+        # (filter out useless-seeming ones):
+        user_attrs = sorted([e for e in dat.__dict__.keys() 
+                             if e not in ('__doc__', '__module__', '__return__')])
+
+        for attr in user_attrs:
+          new_obj.append([self.encode(attr), self.encode(dat.__dict__[attr])])
+      elif typ in (types.FunctionType, types.MethodType):
+        # NB: In Python 3.0, getargspec is deprecated in favor of getfullargspec
+        argspec = inspect.getargspec(dat)
+
+        printed_args = [e for e in argspec.args]
+        if argspec.varargs:
+          printed_args.extend(['*' + e for e in argspec.varargs])
+        if argspec.keywords:
+          printed_args.extend(['**' + e for e in argspec.keywords])
+
+        pretty_name = dat.__name__ + '(' + ', '.join(printed_args) + ')'
+        new_obj.extend(['FUNCTION', pretty_name, None]) # the final element will be filled in later
+      else:
+        typeStr = str(typ)
+        m = typeRE.match(typeStr)
+        assert m, typ
+        new_obj.extend([m.group(1), str(dat)])
+
+      return ret
+
diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
new file mode 100644
index 000000000..c5608218c
--- /dev/null
+++ b/PyTutorGAE/pg_logger.py
@@ -0,0 +1,516 @@
+# Online Python Tutor
+# https://github.com/pgbovine/OnlinePythonTutor/
+# 
+# Copyright (C) 2010-2012 Philip J. Guo (philip@pgbovine.net)
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+# This is the meat of the Online Python Tutor back-end.  It implements a
+# full logger for Python program execution (based on pdb, the standard
+# Python debugger imported via the bdb module), printing out the values
+# of all in-scope data structures after each executed instruction.
+
+
+
+import sys
+import bdb # the KEY import here!
+import re
+import traceback
+import types
+
+import cStringIO
+import pg_encoder
+
+
+# TODO: not threadsafe:
+
+# upper-bound on the number of executed lines, in order to guard against
+# infinite loops
+MAX_EXECUTED_LINES = 300
+
+#DEBUG = False
+DEBUG = True
+
+
+IGNORE_VARS = set(('__user_stdout__', '__builtins__', '__name__', '__exception__', '__doc__'))
+
+def get_user_stdout(frame):
+  return frame.f_globals['__user_stdout__'].getvalue()
+
+def get_user_globals(frame):
+  d = filter_var_dict(frame.f_globals)
+  # also filter out __return__ for globals only, but NOT for locals
+  if '__return__' in d:
+    del d['__return__']
+  return d
+
+def get_user_locals(frame):
+  return filter_var_dict(frame.f_locals)
+
+def filter_var_dict(d):
+  ret = {}
+  for (k,v) in d.iteritems():
+    if k not in IGNORE_VARS:
+      ret[k] = v
+  return ret
+
+
+class PGLogger(bdb.Bdb):
+
+    def __init__(self, finalizer_func):
+        bdb.Bdb.__init__(self)
+        self.mainpyfile = ''
+        self._wait_for_mainpyfile = 0
+
+        # a function that takes the output trace as a parameter and
+        # processes it
+        self.finalizer_func = finalizer_func
+
+        # each entry contains a dict with the information for a single
+        # executed line
+        self.trace = []
+
+        #http://stackoverflow.com/questions/2112396/in-python-in-google-app-engine-how-do-you-capture-output-produced-by-the-print
+        self.GAE_STDOUT = sys.stdout
+
+        # Key:   function object
+        # Value: parent frame
+        self.closures = {}
+                 
+        # List of frames to KEEP AROUND after the function exits,
+        # because nested functions were defined in those frames.
+        # ORDER matters for aesthetics.
+        self.zombie_frames = []
+
+        # all globals that ever appeared in the program, in the order in
+        # which they appeared. note that this might be a superset of all
+        # the globals that exist at any particular execution point,
+        # since globals might have been deleted (using, say, 'del')
+        self.all_globals_in_order = []
+
+        # very important for this single object to persist throughout
+        # execution, or else canonical small IDs won't be consistent.
+        self.encoder = pg_encoder.ObjectEncoder()
+
+
+    # Returns the (lexical) parent frame of the function that was called
+    # to create the stack frame 'frame'.
+    #
+    # OKAY, this is a SUPER hack, but I don't see a way around it
+    # since it's impossible to tell exactly which function
+    # ('closure') object was called to create 'frame'.
+    #
+    # The Python interpreter doesn't maintain this information,
+    # so unless we hack the interpreter, we will simply have
+    # to make an educated guess based on the contents of local
+    # variables inherited from possible parent frame candidates.
+    def get_parent_frame(self, frame):
+      for (func_obj, parent_frame) in self.closures.iteritems():
+        # ok, there's a possible match, but let's compare the
+        # local variables in parent_frame to those of frame
+        # to make sure. this is a hack that happens to work because in
+        # Python, each stack frame inherits ('inlines') a copy of the
+        # variables from its (lexical) parent frame.
+        if func_obj.__code__ == frame.f_code:
+          all_matched = True
+          for k in parent_frame.f_locals:
+            if k != '__return__' and k in frame.f_locals:
+              if parent_frame.f_locals[k] != frame.f_locals[k]:
+                all_matched = False
+                break
+          
+          if all_matched:
+            return parent_frame
+
+      return None
+
+
+    def get_zombie_frame_id(self, f):
+      # should be None unless this is a zombie frame
+      try:
+        # make the frame id's one-indexed for clarity
+        # (and to prevent possible confusion with None)
+        return self.zombie_frames.index(f) + 1
+      except ValueError:
+        pass
+      return None
+
+    def lookup_zombie_frame_by_id(self, idx):
+      # remember this is one-indexed
+      return self.zombie_frames[idx - 1]
+
+
+    # unused ...
+    #def reset(self):
+    #    bdb.Bdb.reset(self)
+    #    self.forget()
+
+
+    def forget(self):
+        self.lineno = None
+        self.stack = []
+        self.curindex = 0
+        self.curframe = None
+
+    def setup(self, f, t):
+        self.forget()
+        self.stack, self.curindex = self.get_stack(f, t)
+        self.curframe = self.stack[self.curindex][0]
+
+
+    # Override Bdb methods
+
+    def user_call(self, frame, argument_list):
+        """This method is called when there is the remote possibility
+        that we ever need to stop in this function."""
+        if self._wait_for_mainpyfile:
+            return
+        if self.stop_here(frame):
+            self.interaction(frame, None, 'call')
+
+    def user_line(self, frame):
+        """This function is called when we stop or break at this line."""
+        if self._wait_for_mainpyfile:
+            if (self.canonic(frame.f_code.co_filename) != "" or 
+                frame.f_lineno <= 0):
+                return
+            self._wait_for_mainpyfile = 0
+        self.interaction(frame, None, 'step_line')
+
+    def user_return(self, frame, return_value):
+        """This function is called when a return trap is set here."""
+        frame.f_locals['__return__'] = return_value
+        self.interaction(frame, None, 'return')
+
+    def user_exception(self, frame, exc_info):
+        exc_type, exc_value, exc_traceback = exc_info
+        """This function is called if an exception occurs,
+        but only if we are to stop at or just below this level."""
+        frame.f_locals['__exception__'] = exc_type, exc_value
+        if type(exc_type) == type(''):
+            exc_type_name = exc_type
+        else: exc_type_name = exc_type.__name__
+        self.interaction(frame, exc_traceback, 'exception')
+
+
+    # General interaction function
+
+    def interaction(self, frame, traceback, event_type):
+        self.setup(frame, traceback)
+        tos = self.stack[self.curindex]
+        top_frame = tos[0]
+        lineno = tos[1]
+
+        self.encoder.reset_heap() # VERY VERY VERY IMPORTANT,
+                                  # or else we won't properly capture heap object mutations in the trace!
+
+
+        # only render zombie frames that are NO LONGER on the stack
+        cur_stack_frames = [e[0] for e in self.stack]
+        zombie_frames_to_render = [e for e in self.zombie_frames if e not in cur_stack_frames]
+
+
+        # each element is a pair of (function name, ENCODED locals dict)
+        encoded_stack_locals = []
+
+
+        # returns a dict with keys: function name, frame id, id of parent frame, encoded_locals dict
+        def create_encoded_stack_entry(cur_frame):
+          ret = {}
+
+
+          # your immediate parent frame ID is parent_frame_id_list[0]
+          # and all other members are your further ancestors
+          parent_frame_id_list = []
+
+          f = cur_frame
+          while True:
+            p = self.get_parent_frame(f)
+            if p:
+              pid = self.get_zombie_frame_id(p)
+              assert pid
+              parent_frame_id_list.append(pid)
+              f = p
+            else:
+              break
+
+
+          cur_name = cur_frame.f_code.co_name
+
+          # special case for lambdas - grab their line numbers too
+          if cur_name == '':
+            cur_name = ''
+          elif cur_name == '':
+            cur_name = 'unnamed function'
+
+          # encode in a JSON-friendly format now, in order to prevent ill
+          # effects of aliasing later down the line ...
+          encoded_locals = {}
+
+          for (k, v) in get_user_locals(cur_frame).iteritems():
+            is_in_parent_frame = False
+
+            # don't display locals that appear in your parents' stack frames,
+            # since that's redundant
+            for pid in parent_frame_id_list:
+              parent_frame = self.lookup_zombie_frame_by_id(pid)
+              if k in parent_frame.f_locals:
+                # ignore __return__
+                if k != '__return__':
+                  # these values SHOULD BE ALIASES
+                  # (don't do an 'is' check since it might not fire for primitives)
+                  assert parent_frame.f_locals[k] == v
+                  is_in_parent_frame = True
+
+            if is_in_parent_frame:
+              continue
+
+            # don't display some built-in locals ...
+            if k == '__module__':
+              continue
+
+            encoded_val = self.encoder.encode(v)
+
+            # UGH, this is SUPER ugly but needed for nested function defs
+            if type(v) in (types.FunctionType, types.MethodType):
+              try:
+                enclosing_frame = self.closures[v]
+                enclosing_frame_id = self.get_zombie_frame_id(enclosing_frame)
+                self.encoder.set_function_parent_frame_ID(encoded_val, enclosing_frame_id)
+              except KeyError:
+                pass
+            encoded_locals[k] = encoded_val
+
+
+          # order the variable names in a sensible way:
+
+          # Let's start with co_varnames, since it (often) contains all
+          # variables in this frame, some of which might not exist yet.
+          ordered_varnames = []
+          for e in cur_frame.f_code.co_varnames:
+            if e in encoded_locals:
+              ordered_varnames.append(e)
+
+          # sometimes co_varnames doesn't contain all of the true local
+          # variables: e.g., when executing a 'class' definition.  in that
+          # case, iterate over encoded_locals and push them onto the end
+          # of ordered_varnames in alphabetical order
+          for e in sorted(encoded_locals.keys()):
+            if e != '__return__' and e not in ordered_varnames:
+              ordered_varnames.append(e)
+
+          # finally, put __return__ at the very end
+          if '__return__' in encoded_locals:
+            ordered_varnames.append('__return__')
+
+          # crucial sanity checks!
+          assert len(ordered_varnames) == len(encoded_locals)
+          for e in ordered_varnames:
+            assert e in encoded_locals
+
+          return dict(func_name=cur_name,
+                      frame_id=self.get_zombie_frame_id(cur_frame),
+                      parent_frame_id_list=parent_frame_id_list,
+                      encoded_locals=encoded_locals,
+                      ordered_varnames=ordered_varnames)
+
+
+        i = self.curindex
+
+        # look for whether a nested function has been defined during
+        # this particular call:
+        if i > 1: # i == 1 implies that there's only a global scope visible
+          for (k, v) in get_user_locals(top_frame).iteritems():
+            if (type(v) in (types.FunctionType, types.MethodType) and \
+                v not in self.closures):
+              self.closures[v] = top_frame
+              if not top_frame in self.zombie_frames:
+                self.zombie_frames.append(top_frame)
+
+
+        # climb up until you find '', which is (hopefully) the global scope
+        while True:
+          cur_frame = self.stack[i][0]
+          cur_name = cur_frame.f_code.co_name
+          if cur_name == '':
+            break
+
+          encoded_stack_locals.append(create_encoded_stack_entry(cur_frame))
+          i -= 1
+
+        zombie_encoded_stack_locals = [create_encoded_stack_entry(e) for e in zombie_frames_to_render]
+
+
+        # encode in a JSON-friendly format now, in order to prevent ill
+        # effects of aliasing later down the line ...
+        encoded_globals = {}
+        for (k, v) in get_user_globals(tos[0]).iteritems():
+          encoded_val = self.encoder.encode(v)
+
+          # UGH, this is SUPER ugly but needed for nested function defs
+          if type(v) in (types.FunctionType, types.MethodType):
+            try:
+              enclosing_frame = self.closures[v]
+              enclosing_frame_id = self.get_zombie_frame_id(enclosing_frame)
+              self.encoder.set_function_parent_frame_ID(encoded_val, enclosing_frame_id)
+            except KeyError:
+              pass
+          encoded_globals[k] = encoded_val
+
+          if k not in self.all_globals_in_order:
+            self.all_globals_in_order.append(k)
+
+        # filter out globals that don't exist at this execution point
+        # (because they've been, say, deleted with 'del')
+        ordered_globals = [e for e in self.all_globals_in_order if e in encoded_globals]
+        assert len(ordered_globals) == len(encoded_globals)
+
+        trace_entry = dict(line=lineno,
+                           event=event_type,
+                           func_name=tos[0].f_code.co_name,
+                           globals=encoded_globals,
+                           ordered_globals=ordered_globals,
+                           stack_locals=encoded_stack_locals,
+                           zombie_stack_locals=zombie_encoded_stack_locals,
+                           heap=self.encoder.get_heap(),
+                           stdout=get_user_stdout(tos[0]))
+
+        # if there's an exception, then record its info:
+        if event_type == 'exception':
+          # always check in f_locals
+          exc = frame.f_locals['__exception__']
+          trace_entry['exception_msg'] = exc[0].__name__ + ': ' + str(exc[1])
+
+        self.trace.append(trace_entry)
+
+        if len(self.trace) >= MAX_EXECUTED_LINES:
+          self.trace.append(dict(event='instruction_limit_reached', exception_msg='(stopped after ' + str(MAX_EXECUTED_LINES) + ' steps to prevent possible infinite loop)'))
+          self.force_terminate()
+
+        self.forget()
+
+
+    def _runscript(self, script_str):
+        # When bdb sets tracing, a number of call and line events happens
+        # BEFORE debugger even reaches user's code (and the exact sequence of
+        # events depends on python version). So we take special measures to
+        # avoid stopping before we reach the main script (see user_line and
+        # user_call for details).
+        self._wait_for_mainpyfile = 1
+
+
+        # I think Google App Engine takes care of sandboxing, but maybe
+        # we should do some extra sandboxing ourselves ...
+        '''
+        # ok, let's try to sorta 'sandbox' the user script by not
+        # allowing certain potentially dangerous operations:
+        user_builtins = {}
+        for (k,v) in __builtins__.iteritems():
+          if k in ('reload', 'input', 'apply', 'open', 'compile', 
+                   '__import__', 'file', 'eval', 'execfile',
+                   'exit', 'quit', 'raw_input', 
+                   'dir', 'globals', 'locals', 'vars',
+                   'compile'):
+            continue
+          user_builtins[k] = v
+        '''
+
+
+        user_stdout = cStringIO.StringIO()
+
+        sys.stdout = user_stdout
+        user_globals = {"__name__"    : "__main__",
+                        "__builtins__" : __builtins__,
+                        "__user_stdout__" : user_stdout}
+
+        try:
+          self.run(script_str, user_globals, user_globals)
+        # sys.exit ...
+        except SystemExit:
+          #sys.exit(0)
+          raise bdb.BdbQuit
+        except:
+          if DEBUG:
+            traceback.print_exc()
+
+          trace_entry = dict(event='uncaught_exception')
+
+          exc = sys.exc_info()[1]
+          if hasattr(exc, 'lineno'):
+            trace_entry['line'] = exc.lineno
+          if hasattr(exc, 'offset'):
+            trace_entry['offset'] = exc.offset
+
+          if hasattr(exc, 'msg'):
+            trace_entry['exception_msg'] = "Error: " + exc.msg
+          else:
+            trace_entry['exception_msg'] = "Unknown error"
+
+          self.trace.append(trace_entry)
+          #self.finalize()
+          raise bdb.BdbQuit # need to forceably STOP execution
+
+
+    def force_terminate(self):
+      #self.finalize()
+      raise bdb.BdbQuit # need to forceably STOP execution
+
+
+    def finalize(self):
+      sys.stdout = self.GAE_STDOUT # very important!
+
+      assert len(self.trace) <= (MAX_EXECUTED_LINES + 1)
+
+      # filter all entries after 'return' from '', since they
+      # seem extraneous:
+      res = []
+      for e in self.trace:
+        res.append(e)
+        if e['event'] == 'return' and e['func_name'] == '':
+          break
+
+      # another hack: if the SECOND to last entry is an 'exception'
+      # and the last entry is return from , then axe the last
+      # entry, for aesthetic reasons :)
+      if len(res) >= 2 and \
+         res[-2]['event'] == 'exception' and \
+         res[-1]['event'] == 'return' and res[-1]['func_name'] == '':
+        res.pop()
+
+      self.trace = res
+
+      #for e in self.trace: print >> sys.stderr, e
+
+      self.finalizer_func(self.trace)
+
+
+
+# the MAIN meaty function!!!
+def exec_script_str(script_str, finalizer_func):
+  logger = PGLogger(finalizer_func)
+
+  try:
+    logger._runscript(script_str)
+  except bdb.BdbQuit:
+    pass
+  finally:
+    logger.finalize()
+
diff --git a/PyTutorGAE/pythontutor.py b/PyTutorGAE/pythontutor.py
new file mode 100644
index 000000000..1e1e1c132
--- /dev/null
+++ b/PyTutorGAE/pythontutor.py
@@ -0,0 +1,67 @@
+# Online Python Tutor
+# https://github.com/pgbovine/OnlinePythonTutor/
+# 
+# Copyright (C) 2010-2012 Philip J. Guo (philip@pgbovine.net)
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+# TODO: if we want to enable concurrent requests, then make sure this is threadsafe (e.g., no mutable globals)
+# then add this string to app.yaml: 'threadsafe: true'
+
+import webapp2
+import pg_logger
+import json
+import jinja2, os
+import sys
+
+
+# TODO: this croaks for some reason ...
+TEST_STR = "import os\nos.chdir('/')"
+
+
+JINJA_ENVIRONMENT = jinja2.Environment(loader=jinja2.FileSystemLoader(os.path.dirname(__file__)))
+
+
+class TutorPage(webapp2.RequestHandler):
+
+  def get(self):
+    self.response.headers['Content-Type'] = 'text/html'
+    template = JINJA_ENVIRONMENT.get_template('tutor.html')
+    self.response.out.write(template.render())
+
+
+class ExecScript(webapp2.RequestHandler):
+
+  def json_finalizer(self, output_lst):
+    json_output = json.dumps(output_lst, indent=None) # use indent=None for most compact repr
+    self.response.out.write(json_output)
+
+  def get(self):
+    self.response.headers['Content-Type'] = 'application/json'
+    self.response.headers['Cache-Control'] = 'no-cache'
+    pg_logger.exec_script_str(self.request.get('user_script'), self.json_finalizer)
+    #pg_logger.exec_script_str(TEST_STR, self.json_finalizer)
+
+
+app = webapp2.WSGIApplication([('/', TutorPage),
+                               ('/exec', ExecScript)],
+                              debug=True)
+
diff --git a/PyTutorGAE/tutor.html b/PyTutorGAE/tutor.html
new file mode 100644
index 000000000..f211de028
--- /dev/null
+++ b/PyTutorGAE/tutor.html
@@ -0,0 +1,234 @@
+
+
+
+
+
+
+  Online Python Tutor (v3)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

+
+Write your Python code here:
+

+
+
 
+
+

+
+
+
+

+
+
Try these small examples:

+
+aliasing |
+intro |
+factorial |
+fibonacci |
+memoized fib |
+square root |
+insertion sort
+

+filter |
+tokenize |
+OOP |
+gcd |
+sumList |
+towers of hanoi |
+exceptions
+
+

+
+
From MIT's 6.01 course:

+
+list map |
+summation |
+OOP 1 |
+OOP 2 |
+inheritance
+
+

+
+
Nested functions:
+

+
+closure 1 |
+closure 2 |
+closure 3 |
+closure 4 |
+closure 5
+
+

+
+
Aliasing:
+

+
+aliasing 1 |
+aliasing 2 |
+aliasing 3 |
+aliasing 4 |
+aliasing 5 |
+aliasing 6 |
+aliasing 7
+
+

+
+
Linked lists:
+

+
+LL 1 |
+LL 2
+
+

+
+
+

+
+
+
+
+
+  
+
+
+
+
+
+
+

+    
+  

+
+

+
+

+
+

+
+
+
+

+
+
Use the slider or the left and right arrow keys to step through execution.
+
Click on code to set breakpoints.

+
+

+

+
+

+  
+

+
+
+

+
+
+

+
+Program output:
+

+
+
+

+ 
+

+
+
+		
+
+

+
+

+
+
 
+
+
+
+
+
+
diff --git a/example-code/aliasing.txt b/example-code/aliasing.txt
index e866323d5..174ba2ec4 100644
--- a/example-code/aliasing.txt
+++ b/example-code/aliasing.txt
@@ -8,11 +8,11 @@ x.append(6)
 y.append(7)
 y = "hello"
 
-def foo(lst):
+def foo(lst): # breakpoint
     lst.append("hello")
     bar(lst)
 
-def bar(myLst):
+def bar(myLst): # breakpoint
     print myLst
 
 foo(x)
diff --git a/example-code/aliasing/aliasing1.txt b/example-code/aliasing/aliasing1.txt
new file mode 100644
index 000000000..f6d9efea8
--- /dev/null
+++ b/example-code/aliasing/aliasing1.txt
@@ -0,0 +1,2 @@
+a = (1, (2, (3, None)))
+b = a[1]
diff --git a/example-code/aliasing/aliasing2.txt b/example-code/aliasing/aliasing2.txt
new file mode 100644
index 000000000..57984f2ff
--- /dev/null
+++ b/example-code/aliasing/aliasing2.txt
@@ -0,0 +1,2 @@
+c = (1, (2, None))
+d = (1, c)
diff --git a/example-code/aliasing/aliasing3.txt b/example-code/aliasing/aliasing3.txt
new file mode 100644
index 000000000..fcb9e9c63
--- /dev/null
+++ b/example-code/aliasing/aliasing3.txt
@@ -0,0 +1,7 @@
+l1, l2, l3, l4 = 1, 2, 3, 4
+
+t1 = (l1, l2)
+t2 = (l3, l4)
+t = (t1, t2)
+u = ((1, 2), (3, 4))
+v = u[0]
diff --git a/example-code/aliasing/aliasing4.txt b/example-code/aliasing/aliasing4.txt
new file mode 100644
index 000000000..7ca952d22
--- /dev/null
+++ b/example-code/aliasing/aliasing4.txt
@@ -0,0 +1,2 @@
+x = [1, 2, 3]
+x.append(x)
diff --git a/example-code/aliasing/aliasing5.txt b/example-code/aliasing/aliasing5.txt
new file mode 100644
index 000000000..232486f7c
--- /dev/null
+++ b/example-code/aliasing/aliasing5.txt
@@ -0,0 +1,3 @@
+x = None
+for i in range(5, 0, -1):
+  x = (i, x)
diff --git a/example-code/aliasing/aliasing6.txt b/example-code/aliasing/aliasing6.txt
new file mode 100644
index 000000000..5f9c1e8b5
--- /dev/null
+++ b/example-code/aliasing/aliasing6.txt
@@ -0,0 +1,7 @@
+# wow, this looks gross :)
+t1 = (1, 2)
+t2 = (3, 4)
+t = [t1, t2]
+u = [t, t, t]
+u[1] = u
+t[0] = u
diff --git a/example-code/aliasing/aliasing7.txt b/example-code/aliasing/aliasing7.txt
new file mode 100644
index 000000000..6e709dafc
--- /dev/null
+++ b/example-code/aliasing/aliasing7.txt
@@ -0,0 +1,5 @@
+x = (3, {'joe': 'M', 'jane': 'F'})
+y = (2, x)
+z = (1, y)
+w = (x, y, z)
+
diff --git a/example-code/closures/closure1.txt b/example-code/closures/closure1.txt
new file mode 100644
index 000000000..674c82bb2
--- /dev/null
+++ b/example-code/closures/closure1.txt
@@ -0,0 +1,7 @@
+def foo(y):
+ def bar(x):
+   return x + y
+ return bar
+
+b = foo(1)
+b(2)
diff --git a/example-code/closures/closure2.txt b/example-code/closures/closure2.txt
new file mode 100644
index 000000000..dee3a5fd6
--- /dev/null
+++ b/example-code/closures/closure2.txt
@@ -0,0 +1,15 @@
+def foo(y):
+  def bar(x):
+    return x + y
+  return bar
+
+def foo_deux(y):
+  def bar_deux(x):
+    return x + y
+  return bar_deux
+
+b = foo(1)
+b_deux = foo_deux(1000)
+
+b(2)    
+b_deux(2000)
diff --git a/example-code/closures/closure3.txt b/example-code/closures/closure3.txt
new file mode 100644
index 000000000..7e3eb523a
--- /dev/null
+++ b/example-code/closures/closure3.txt
@@ -0,0 +1,10 @@
+def foo(x):
+ def bar(y):
+   def baz(z):
+     return len(x) + len(y) + len(z)
+   return baz
+ return bar([4,5,6,7])
+
+l = [1,2,3]
+x = foo(l)
+x([8,9,10,11,12])
diff --git a/example-code/closures/closure4.txt b/example-code/closures/closure4.txt
new file mode 100644
index 000000000..2947e96be
--- /dev/null
+++ b/example-code/closures/closure4.txt
@@ -0,0 +1,8 @@
+def f(x):
+  def g(y):
+    return x + y
+  return g
+
+g1 = f(1)
+g2 = f(2)
+g1(3) + g2(4)
diff --git a/example-code/closures/closure5.txt b/example-code/closures/closure5.txt
new file mode 100644
index 000000000..9484abcb0
--- /dev/null
+++ b/example-code/closures/closure5.txt
@@ -0,0 +1,10 @@
+def f(x):
+  def g(y, z):
+    if z == 0:
+      return y
+    return g(x+y+z, z-1)
+  return lambda: g(0, x)
+
+foo = f(3)
+bar = f(4)
+baz = foo() + bar()
diff --git a/example-code/linked-lists/ll1.txt b/example-code/linked-lists/ll1.txt
new file mode 100644
index 000000000..db8b48fc0
--- /dev/null
+++ b/example-code/linked-lists/ll1.txt
@@ -0,0 +1,10 @@
+# use lists
+x = None
+for i in range(6, 0, -1):
+  x = [i, x]
+
+# use tuples
+y = None
+for i in range(6, 0, -1):
+  y = (i, y)
+
diff --git a/example-code/linked-lists/ll2.txt b/example-code/linked-lists/ll2.txt
new file mode 100644
index 000000000..3a1181499
--- /dev/null
+++ b/example-code/linked-lists/ll2.txt
@@ -0,0 +1,15 @@
+# use dicts
+x = None
+for i in range(6, 0, -1):
+  x = {'data': i, 'next': x}
+
+# use objects
+class Node:
+  def __init__(self, data, next):
+    self.data = data
+    self.next = next
+
+y = None
+for i in range(6, 0, -1):
+  y = Node(i, y)
+

From 1231fb584c53a15eb3fc4433cfc48546da395280 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 4 Aug 2012 10:22:48 -0700
Subject: [PATCH 015/502] test commit

---
 PyTutorGAE/js/edu-python.js | 1 -
 1 file changed, 1 deletion(-)

diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index c719544fd..82d345546 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -43,7 +43,6 @@ var errorColor = '#F87D76';
 var visitedLineColor = '#3D58A2';
 
 var lightGray = "#cccccc";
-//var lightGray = "#dddddd";
 var darkBlue = "#3D58A2";
 var lightBlue = "#899CD1";
 var pinkish = "#F15149";

From e60e7443a30454427055124a2c296e34902dc90f Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 4 Aug 2012 11:37:23 -0700
Subject: [PATCH 016/502] more refactoring action

---
 PyTutorGAE/css/edu-python.css |  15 +-
 PyTutorGAE/js/edu-python.js   | 459 +++++++++-------------------------
 2 files changed, 128 insertions(+), 346 deletions(-)

diff --git a/PyTutorGAE/css/edu-python.css b/PyTutorGAE/css/edu-python.css
index 7cb665972..a43b74240 100644
--- a/PyTutorGAE/css/edu-python.css
+++ b/PyTutorGAE/css/edu-python.css
@@ -126,7 +126,7 @@ span {
 td#stack_td,
 td#heap_td {
   vertical-align:top;
-  font-size: 12pt;
+  font-size: 10pt; /* don't make fonts in the heap so big! */
 }
 
 table#pyOutputPane {
@@ -286,19 +286,16 @@ button.smallBtn {
 }
 
 .keyObj {
-  font-size: 10pt;
 }
 
 .customObj {
   font-family: Andale mono, monospace;
   /*font-style: italic;*/
-  font-size: 10pt;
 }
 
 .funcObj {
   font-family: Andale mono, monospace;
   /*font-style: italic;*/
-  font-size: 10pt;
 }
 
 .retval,
@@ -349,6 +346,16 @@ table.tupleTbl td.tupleElt {
   border-left: 1px solid #555555; /* must match td.tupleHeader border */
 }
 
+table.customObjTbl {
+  background-color: white;
+  color: black;
+  border: 1px solid black;
+}
+
+table.customObjTbl td.customObjElt {
+  padding: 5px;
+}
+
 table.listTbl td.listElt,
 table.tupleTbl td.tupleElt {
   padding-top: 0px;
diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 82d345546..443d1e934 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -726,8 +726,9 @@ function renderDataStructures(curEntry, vizDiv) {
     var obj = curEntry.heap[objID];
     assert($.isArray(obj));
 
-    if (obj[0] == 'LIST' || obj[0] == 'TUPLE') {
-      var label = obj[0] == 'LIST' ? 'list' : 'tuple';
+
+    if (obj[0] == 'LIST' || obj[0] == 'TUPLE' || obj[0] == 'SET' || obj[0] == 'DICT') {
+      var label = obj[0].toLowerCase();
 
       assert(obj.length >= 1);
       if (obj.length == 1) {
@@ -735,383 +736,157 @@ function renderDataStructures(curEntry, vizDiv) {
       }
       else {
         d3DomElement.append('
' + label + '
');
-        d3DomElement.append('
');
+        d3DomElement.append('
');
         var tbl = d3DomElement.children('table');
-        var headerTr = tbl.find('tr:first');
-        var contentTr = tbl.find('tr:last');
-        $.each(obj, function(ind, val) {
-          if (ind < 1) return; // skip type tag and ID entry
-
-          // add a new column and then pass in that newly-added column
-          // as d3DomElement to the recursive call to child:
-          headerTr.append('');
-          headerTr.find('td:last').append(ind - 1);
-
-          contentTr.append('');
-          renderNestedObject(val, contentTr.find('td:last'));
-        });
-      }
-    }
-    else if (obj[0] == 'SET') {
-
-    }
-    else if (obj[0] == 'DICT') {
-
-    }
-    else if (obj[0] == 'INSTANCE') {
-    }
-    else if (obj[0] == 'CLASS') {
-    }
-    else if (obj[0] == 'FUNCTION') {
-    }
-    else {
-      // render custom data type
-    }
-  }
-
-
-
-  // prepend heap header after all the dust settles:
-  $(vizDiv + ' #heap').prepend('
Objects
');
-
-  return;
-
-  // Key:   CSS ID of the div element representing the variable
-  //        (or heap object, for heap->heap connections, where the
-  //        format is: 'heap_pointer_src_')
-  // Value: CSS ID of the div element representing the value rendered in the heap
-  //        (the format is: 'heap_object_')
-  var connectionEndpointIDs = {};
-  var heapConnectionEndpointIDs = {}; // subset of connectionEndpointIDs for heap->heap connections
-
-  var heap_pointer_src_id = 1; // increment this to be unique for each heap_pointer_src_*
-
-
-  // nested helper functions are SUPER-helpful!
-
-  // render the JS data object obj inside of jDomElt,
-  // which is a jQuery wrapped DOM object
-  // (obj is in a format encoded by pg_encoder.py on the backend)
-  // isTopLevel is true only if this is a top-level heap object (rather
-  // than a nested sub-object)
-  function renderData(obj, jDomElt, isTopLevel) {
-    var typ = typeof obj;
-    var oID = getObjectID(obj);
-
-    if (isPrimitiveType(obj)) {
-      // only wrap primitive types in heap objects if they are at the
-      // TOP-LEVEL (otherwise just render them inline within other data
-      // structures)
-      if (isTopLevel) {
-        jDomElt.append('
');
-        jDomElt = $('#heap_object_' + oID);
-      }
-
-      if (obj == null) {
-        jDomElt.append('None');
-      }
-      else if (typ == "number") {
-        jDomElt.append('' + obj + '');
-      }
-      else if (typ == "boolean") {
-        if (obj) {
-          jDomElt.append('True');
-        }
-        else {
-          jDomElt.append('False');
-        }
-      }
-      else if (typ == "string") {
-        // escape using htmlspecialchars to prevent HTML/script injection
-        var literalStr = htmlspecialchars(obj);
-
-        // print as a double-quoted string literal
-        literalStr = literalStr.replace(new RegExp('\"', 'g'), '\\"'); // replace ALL
-        literalStr = '"' + literalStr + '"';
-
-        jDomElt.append('' + literalStr + '');
-      }
-    }
-    else {
-      assert(typ == "object");
-      assert($.isArray(obj));
-
-      if ((compound_objects_already_rendered[oID] !== undefined) ||
-          (obj[0] == 'CIRCULAR_REF')) {
-        // render heap->heap connection
-        if (!isTopLevel) {
-          // add a stub so that we can connect it with a connector later.
-          // IE needs this div to be NON-EMPTY in order to properly
-          // render jsPlumb endpoints, so that's why we add an " "!
 
-          var srcDivID = 'heap_pointer_src_' + heap_pointer_src_id;
-          heap_pointer_src_id++; // just make sure each source has a UNIQUE ID
-          jDomElt.append('
 
');
+        if (obj[0] == 'LIST' || obj[0] == 'TUPLE') {
+          tbl.append('');
+          var headerTr = tbl.find('tr:first');
+          var contentTr = tbl.find('tr:last');
+          $.each(obj, function(ind, val) {
+            if (ind < 1) return; // skip type tag and ID entry
 
-          assert(connectionEndpointIDs[srcDivID] === undefined);
-          connectionEndpointIDs[srcDivID] = 'heap_object_' + oID;
+            // add a new column and then pass in that newly-added column
+            // as d3DomElement to the recursive call to child:
+            headerTr.append('');
+            headerTr.find('td:last').append(ind - 1);
 
-          assert(heapConnectionEndpointIDs[srcDivID] === undefined);
-          heapConnectionEndpointIDs[srcDivID] = 'heap_object_' + oID;
+            contentTr.append('');
+            renderNestedObject(val, contentTr.find('td:last'));
+          });
         }
-      }
-      else {
-        // wrap compound objects in a heapObject div so that jsPlumb
-        // connectors can point to it:
-        jDomElt.append('
');
-        jDomElt = $('#heap_object_' + oID);
-        
-        if (obj[0] == 'LIST') {
-          assert(obj.length >= 2);
-          if (obj.length == 2) {
-            jDomElt.append('
empty list
');
+        else if (obj[0] == 'SET') {
+          // create an R x C matrix:
+          var numElts = obj.length - 1;
+
+          // gives roughly a 3x5 rectangular ratio, square is too, err,
+          // 'square' and boring
+          var numRows = Math.round(Math.sqrt(numElts));
+          if (numRows > 3) {
+            numRows -= 1;
           }
-          else {
-            jDomElt.append('
list
');
-
-            jDomElt.append('
');
-            var tbl = jDomElt.children('table');
-            var headerTr = tbl.find('tr:first');
-            var contentTr = tbl.find('tr:last');
-            jQuery.each(obj, function(ind, val) {
-              if (ind < 2) return; // skip 'LIST' tag and ID entry
-
-              // add a new column and then pass in that newly-added column
-              // as jDomElt to the recursive call to child:
-              headerTr.append('');
-              headerTr.find('td:last').append(ind - 2);
-
-              contentTr.append('');
-
-              // heuristic for rendering top-level 1-D linked data structures as separate top-level objects
-              // (and then drawing an arrow to the next element using a regular renderData() call)
-              if (isTopLevel && structurallyEquivalent(obj, val)) {
-                var childHeapObjectID = 'toplevel_heap_object_' + getObjectID(val);
-
-                var enclosingTr = jDomElt.parent().parent();
-                enclosingTr.append('');
-                renderData(val, enclosingTr.find('#' + childHeapObjectID), true /* isTopLevel */);
-              }
 
-              renderData(val, contentTr.find('td:last'), false);
-            });
-          }
-        }
-        else if (obj[0] == 'TUPLE') {
-          assert(obj.length >= 2);
-          if (obj.length == 2) {
-            jDomElt.append('
empty tuple
');
+          var numCols = Math.round(numElts / numRows);
+          // round up if not a perfect multiple:
+          if (numElts % numRows) {
+            numCols += 1;
           }
-          else {
-            jDomElt.append('
tuple
');
-            jDomElt.append('
');
-            var tbl = jDomElt.children('table');
-            var headerTr = tbl.find('tr:first');
-            var contentTr = tbl.find('tr:last');
-            jQuery.each(obj, function(ind, val) {
-              if (ind < 2) return; // skip 'TUPLE' tag and ID entry
 
-              // add a new column and then pass in that newly-added column
-              // as jDomElt to the recursive call to child:
-              headerTr.append('');
-              headerTr.find('td:last').append(ind - 2);
+          jQuery.each(obj, function(ind, val) {
+            if (ind < 1) return; // skip 'SET' tag
 
-              contentTr.append('');
-
-              // heuristic for rendering top-level 1-D linked data structures as separate top-level objects
-              // (and then drawing an arrow to the next element using a regular renderData() call)
-              if (isTopLevel && structurallyEquivalent(obj, val)) {
-                var childHeapObjectID = 'toplevel_heap_object_' + getObjectID(val);
-
-                var enclosingTr = jDomElt.parent().parent();
-                enclosingTr.append('');
-                renderData(val, enclosingTr.find('#' + childHeapObjectID), true /* isTopLevel */);
-              }
-
-              renderData(val, contentTr.find('td:last'), false);
-            });
-          }
-        }
-        else if (obj[0] == 'SET') {
-          assert(obj.length >= 2);
-          if (obj.length == 2) {
-            jDomElt.append('
empty set
');
-          }
-          else {
-            jDomElt.append('
set
');
-            jDomElt.append('
');
-            var tbl = jDomElt.children('table');
-            // create an R x C matrix:
-            var numElts = obj.length - 2;
-            // gives roughly a 3x5 rectangular ratio, square is too, err,
-            // 'square' and boring
-            var numRows = Math.round(Math.sqrt(numElts));
-            if (numRows > 3) {
-              numRows -= 1;
+            if (((ind - 1) % numCols) == 0) {
+              tbl.append('');
             }
 
-            var numCols = Math.round(numElts / numRows);
-            // round up if not a perfect multiple:
-            if (numElts % numRows) {
-              numCols += 1;
-            }
-
-            jQuery.each(obj, function(ind, val) {
-              if (ind < 2) return; // skip 'SET' tag and ID entry
-
-              if (((ind - 2) % numCols) == 0) {
-                tbl.append('');
-              }
-
-              var curTr = tbl.find('tr:last');
-              curTr.append('');
-              renderData(val, curTr.find('td:last'), false);
-            });
-          }
+            var curTr = tbl.find('tr:last');
+            curTr.append('');
+            renderNestedObject(val, curTr.find('td:last'));
+          });
         }
         else if (obj[0] == 'DICT') {
-          assert(obj.length >= 2);
-          if (obj.length == 2) {
-            jDomElt.append('
empty dict
');
-          }
-          else {
-            jDomElt.append('
dict
');
-            jDomElt.append('
');
-            var tbl = jDomElt.children('table');
-            $.each(obj, function(ind, kvPair) {
-              if (ind < 2) return; // skip 'DICT' tag and ID entry
+          $.each(obj, function(ind, kvPair) {
+            if (ind < 1) return; // skip 'DICT' tag
 
-              tbl.append('');
-              var newRow = tbl.find('tr:last');
-              var keyTd = newRow.find('td:first');
-              var valTd = newRow.find('td:last');
-
-              var key = kvPair[0];
-              var val = kvPair[1];
+            tbl.append('');
+            var newRow = tbl.find('tr:last');
+            var keyTd = newRow.find('td:first');
+            var valTd = newRow.find('td:last');
 
-              renderData(key, keyTd, false);
+            var key = kvPair[0];
+            var val = kvPair[1];
 
-              // heuristic for rendering top-level 1-D linked data structures as separate top-level objects
-              // (and then drawing an arrow to the next element using a regular renderData() call)
-              if (isTopLevel && structurallyEquivalent(obj, val)) {
-                var childHeapObjectID = 'toplevel_heap_object_' + getObjectID(val);
+            renderNestedObject(key, keyTd);
+            renderNestedObject(val, valTd);
+          });
+        }
+      }
+    }
+    else if (obj[0] == 'INSTANCE' || obj[0] == 'CLASS') {
+      var isInstance = (obj[0] == 'INSTANCE');
+      var headerLength = isInstance ? 2 : 3;
 
-                var enclosingTr = jDomElt.parent().parent();
-                enclosingTr.append('');
-                renderData(val, enclosingTr.find('#' + childHeapObjectID), true /* isTopLevel */);
-              }
+      assert(obj.length >= headerLength);
 
-              renderData(val, valTd, false);
-            });
-          }
+      if (isInstance) {
+        d3DomElement.append('
' + obj[1] + ' instance
');
+      }
+      else {
+        var superclassStr = '';
+        if (obj[2].length > 0) {
+          superclassStr += ('[extends ' + obj[2].join(',') + '] ');
         }
-        else if (obj[0] == 'INSTANCE') {
-          assert(obj.length >= 3);
-          jDomElt.append('
' + obj[1] + ' instance
');
+        d3DomElement.append('
' + obj[1] + ' class ' + superclassStr + '
');
+      }
 
-          if (obj.length > 3) {
-            jDomElt.append('
');
-            var tbl = jDomElt.children('table');
-            $.each(obj, function(ind, kvPair) {
-              if (ind < 3) return; // skip type tag, class name, and ID entry
+      if (obj.length > headerLength) {
+        var lab = isInstance ? 'inst' : 'class';
+        d3DomElement.append('
');
 
-              tbl.append('');
-              var newRow = tbl.find('tr:last');
-              var keyTd = newRow.find('td:first');
-              var valTd = newRow.find('td:last');
+        var tbl = d3DomElement.children('table');
 
-              // the keys should always be strings, so render them directly (and without quotes):
-              assert(typeof kvPair[0] == "string");
-              var attrnameStr = htmlspecialchars(kvPair[0]);
-              keyTd.append('' + attrnameStr + '');
+        $.each(obj, function(ind, kvPair) {
+          if (ind < headerLength) return; // skip header tags
 
-              // values can be arbitrary objects, so recurse:
-              var val = kvPair[1];
+          tbl.append('');
 
-              // heuristic for rendering top-level 1-D linked data structures as separate top-level objects
-              // (and then drawing an arrow to the next element using a regular renderData() call)
-              if (isTopLevel && structurallyEquivalent(obj, val)) {
-                var childHeapObjectID = 'toplevel_heap_object_' + getObjectID(val);
+          var newRow = tbl.find('tr:last');
+          var keyTd = newRow.find('td:first');
+          var valTd = newRow.find('td:last');
 
-                var enclosingTr = jDomElt.parent().parent();
-                enclosingTr.append('');
-                renderData(val, enclosingTr.find('#' + childHeapObjectID), true /* isTopLevel */);
-              }
+          // the keys should always be strings, so render them directly (and without quotes):
+          assert(typeof kvPair[0] == "string");
+          var attrnameStr = htmlspecialchars(kvPair[0]);
+          keyTd.append('' + attrnameStr + '');
 
-              renderData(val, valTd, false);
-            });
-          }
-        }
-        else if (obj[0] == 'CLASS') {
-          assert(obj.length >= 4);
-          var superclassStr = '';
-          if (obj[3].length > 0) {
-            superclassStr += ('[extends ' + obj[3].join(',') + '] ');
-          }
+          // values can be arbitrary objects, so recurse:
+          renderNestedObject(kvPair[1], valTd);
+        });
+      }
+    }
+    else if (obj[0] == 'FUNCTION') {
+      assert(obj.length == 3);
 
-          jDomElt.append('
' + obj[1] + ' class ' + superclassStr + '
');
+      var funcName = htmlspecialchars(obj[1]); // for displaying weird names like ''
+      var parentFrameID = obj[2]; // optional
 
-          if (obj.length > 4) {
-            jDomElt.append('
');
-            var tbl = jDomElt.children('table');
-            $.each(obj, function(ind, kvPair) {
-              if (ind < 4) return; // skip type tag, class name, ID, and superclasses entries
+      if (parentFrameID) {
+        d3DomElement.append('
function ' + funcName + ' [parent=f'+ parentFrameID + ']
');
+      }
+      else {
+        d3DomElement.append('
function ' + funcName + '
');
+      }
+    }
+    else {
+      // render custom data type
+      assert(obj.length == 2);
 
-              tbl.append('');
-              var newRow = tbl.find('tr:last');
-              var keyTd = newRow.find('td:first');
-              var valTd = newRow.find('td:last');
+      var typeName = obj[0];
+      var strRepr = obj[1];
 
-              // the keys should always be strings, so render them directly (and without quotes):
-              assert(typeof kvPair[0] == "string");
-              var attrnameStr = htmlspecialchars(kvPair[0]);
-              keyTd.append('' + attrnameStr + '');
+      strRepr = htmlspecialchars(strRepr); // escape strings!
 
-              // values can be arbitrary objects, so recurse:
-              renderData(kvPair[1], valTd, false);
-            });
-          }
-        }
-        else if (obj[0] == 'FUNCTION') {
-          assert(obj.length == 4);
-          id = obj[1];
-          funcName = htmlspecialchars(obj[2]); // for displaying names like ''
-          parentFrameID = obj[3]; // optional
+      d3DomElement.append('
' + typeName + '
');
+      d3DomElement.append('
' + strRepr + '
');
+    }
+  }
 
-          if (parentFrameID) {
-            jDomElt.append('
function ' + funcName + ' [parent=f'+ parentFrameID + ']
');
-          }
-          else {
-            jDomElt.append('
function ' + funcName + '
');
-          }
 
-        }
-        else {
-          // render custom data type
-          assert(obj.length == 3);
-          typeName = obj[0];
-          id = obj[1];
-          strRepr = obj[2];
+  // prepend heap header after all the dust settles:
+  $(vizDiv + ' #heap').prepend('
Objects
');
 
-          // if obj[2] is like ' at 0x84760>',
-          // then display an abbreviated version rather than the gory details
-          noStrReprRE = /<.* at 0x.*>/;
-          if (noStrReprRE.test(strRepr)) {
-            jDomElt.append('' + typeName + '');
-          }
-          else {
-            strRepr = htmlspecialchars(strRepr); // escape strings!
+  return;
 
-            // warning: we're overloading tuple elts for custom data types
-            jDomElt.append('
' + typeName + '
');
-            jDomElt.append('
' + strRepr + '
');
-          }
-        }
 
-        compound_objects_already_rendered[oID] = 1; // add to set
-      }
-    }
-  }
+  // Key:   CSS ID of the div element representing the variable
+  //        (or heap object, for heap->heap connections, where the
+  //        format is: 'heap_pointer_src_')
+  // Value: CSS ID of the div element representing the value rendered in the heap
+  //        (the format is: 'heap_object_')
+  var connectionEndpointIDs = {};
+  var heapConnectionEndpointIDs = {}; // subset of connectionEndpointIDs for heap->heap connections
+
+  var heap_pointer_src_id = 1; // increment this to be unique for each heap_pointer_src_*
 
 
   function renderGlobals() {

From d93927b4d0f038755d1299ff45704aecced4e82f Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 4 Aug 2012 13:22:36 -0700
Subject: [PATCH 017/502] yay

---
 PyTutorGAE/js/edu-python.js | 218 ++++++++++--------------------------
 1 file changed, 59 insertions(+), 159 deletions(-)

diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 443d1e934..c4b58be25 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -603,16 +603,27 @@ function renderDataStructures(curEntry, vizDiv) {
   }
 
 
+
   // variables are displayed in the following order, so lay out heap objects in the same order:
   //   - globals
   //   - stack entries (regular and zombies)
+
+  // if there are multiple aliases to the same object, we want to render
+  // the one "deepest" in the stack, so that we can hopefully prevent
+  // objects from jumping around as functions are called and returned.
+  // e.g., if a list L appears as a global variable and as a local in a
+  // function, we want to render L when rendering the global frame.
+  //
+  // this is straightforward: just go through globals first and then
+  // each stack frame in order :)
+
   $.each(curEntry.ordered_globals, function(i, varname) {
     var val = curEntry.globals[varname];
     // (use '!==' to do an EXACT match against undefined)
     if (val !== undefined) { // might not be defined at this line, which is OKAY!
       if (!isPrimitiveType(val)) {
         layoutHeapObject(val);
-        console.log('global:', varname, getRefID(val));
+        //console.log('global:', varname, getRefID(val));
       }
     }
   });
@@ -629,7 +640,7 @@ function renderDataStructures(curEntry, vizDiv) {
 
         if (!isPrimitiveType(val)) {
           layoutHeapObject(val);
-          console.log(frame.func_name + ':', varname, getRefID(val));
+          //console.log(frame.func_name + ':', varname, getRefID(val));
         }
       });
     }
@@ -637,10 +648,12 @@ function renderDataStructures(curEntry, vizDiv) {
 
 
   // print toplevelHeapLayout
+  /*
   $.each(toplevelHeapLayout, function(i, elt) {
     console.log(elt);
   });
   console.log('---');
+  */
 
 
   var renderedObjectIDs = {}; // set (TODO: refactor all sets to use d3.map)
@@ -673,7 +686,7 @@ function renderDataStructures(curEntry, vizDiv) {
 
   function renderNestedObject(obj, d3DomElement) {
     if (isPrimitiveType(obj)) {
-      renderPrimitiveObject(obj, d3DomElement, false);
+      renderPrimitiveObject(obj, d3DomElement);
     }
     else {
       renderCompoundObject(getRefID(obj), d3DomElement, false);
@@ -814,7 +827,7 @@ function renderDataStructures(curEntry, vizDiv) {
       else {
         var superclassStr = '';
         if (obj[2].length > 0) {
-          superclassStr += ('[extends ' + obj[2].join(',') + '] ');
+          superclassStr += ('[extends ' + obj[2].join(', ') + '] ');
         }
         d3DomElement.append('
' + obj[1] + ' class ' + superclassStr + '
');
       }
@@ -875,12 +888,11 @@ function renderDataStructures(curEntry, vizDiv) {
   // prepend heap header after all the dust settles:
   $(vizDiv + ' #heap').prepend('
Objects
');
 
-  return;
 
 
-  // Key:   CSS ID of the div element representing the variable
-  //        (or heap object, for heap->heap connections, where the
-  //        format is: 'heap_pointer_src_')
+  // Key:   CSS ID of the div element representing the stack frame variable
+  //        (for stack->heap connections) or heap object (for heap->heap connections)
+  //        the format is: 'heap_pointer_src_'
   // Value: CSS ID of the div element representing the value rendered in the heap
   //        (the format is: 'heap_object_')
   var connectionEndpointIDs = {};
@@ -889,45 +901,50 @@ function renderDataStructures(curEntry, vizDiv) {
   var heap_pointer_src_id = 1; // increment this to be unique for each heap_pointer_src_*
 
 
-  function renderGlobals() {
-    // render all global variables IN THE ORDER they were created by the program,
-    // in order to ensure continuity:
-    if (curEntry.ordered_globals.length > 0) {
-      $(vizDiv + " #stack").append('
Global variables
');
+  // Render globals and then stack frames:
 
-      $(vizDiv + " #stack #globals").append('
');
+  // render all global variables IN THE ORDER they were created by the program,
+  // in order to ensure continuity:
+  if (curEntry.ordered_globals.length > 0) {
+    $(vizDiv + " #stack").append('
Global variables
');
+    $(vizDiv + " #stack #globals").append('
');
 
-      var tbl = $(vizDiv + " #global_table");
-      // iterate IN ORDER (it's possible that not all vars are in curEntry.globals)
-      $.each(curEntry.ordered_globals, function(i, varname) {
-        var val = curEntry.globals[varname];
-        // (use '!==' to do an EXACT match against undefined)
-        if (val !== undefined) { // might not be defined at this line, which is OKAY!
-          tbl.append('' + varname + '');
-          var curTr = tbl.find('tr:last');
+    var tbl = $(vizDiv + " #global_table");
 
-          if (renderInline(val)) {
-            renderData(val, curTr.find("td.stackFrameValue"), false /* don't wrap it in a .heapObject div */);
-          }
-          else{
-            // add a stub so that we can connect it with a connector later.
-            // IE needs this div to be NON-EMPTY in order to properly
-            // render jsPlumb endpoints, so that's why we add an " "!
+    $.each(curEntry.ordered_globals, function(i, varname) {
+      var val = curEntry.globals[varname];
+      // (use '!==' to do an EXACT match against undefined)
+      if (val !== undefined) { // might not be defined at this line, which is OKAY!
+        tbl.append('' + varname + '');
+        var curTr = tbl.find('tr:last');
 
-            // make sure varname doesn't contain any weird
-            // characters that are illegal for CSS ID's ...
-            var varDivID = 'global__' + varnameToCssID(varname);
-            curTr.find("td.stackFrameValue").append('
 
');
+        if (isPrimitiveType(val)) {
+          renderPrimitiveObject(val, curTr.find("td.stackFrameValue"));
+        }
+        else{
+          // add a stub so that we can connect it with a connector later.
+          // IE needs this div to be NON-EMPTY in order to properly
+          // render jsPlumb endpoints, so that's why we add an " "!
 
-            assert(connectionEndpointIDs[varDivID] === undefined);
-            var heapObjID = 'heap_object_' + getObjectID(val);
-            connectionEndpointIDs[varDivID] = heapObjID;
-          }
+          // make sure varname doesn't contain any weird
+          // characters that are illegal for CSS ID's ...
+          var varDivID = 'global__' + varnameToCssID(varname);
+          curTr.find("td.stackFrameValue").append('
 
');
+
+          assert(connectionEndpointIDs[varDivID] === undefined);
+          var heapObjID = 'heap_object_' + getRefID(val);
+          connectionEndpointIDs[varDivID] = heapObjID;
         }
-      });
-    }
+      }
+    });
   }
 
+
+  $.each(stack_to_render, function(i, e) {
+    renderStackFrame(e, i, e.is_zombie);
+  });
+
+
   function renderStackFrame(frame, ind, is_zombie) {
     var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
     var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
@@ -965,7 +982,6 @@ function renderDataStructures(curEntry, vizDiv) {
     }
     $(vizDiv + " #stack #" + divID).append('
' + headerLabel + '
');
 
-
     if (frame.ordered_varnames.length > 0) {
       var tableID = divID + '_table';
       $(vizDiv + " #stack #" + divID).append('
');
@@ -996,8 +1012,8 @@ function renderDataStructures(curEntry, vizDiv) {
 
         var curTr = tbl.find('tr:last');
 
-        if (renderInline(val)) {
-          renderData(val, curTr.find("td.stackFrameValue"), false /* don't wrap it in a .heapObject div */);
+        if (isPrimitiveType(val)) {
+          renderPrimitiveObject(val, curTr.find("td.stackFrameValue"));
         }
         else {
           // add a stub so that we can connect it with a connector later.
@@ -1014,127 +1030,11 @@ function renderDataStructures(curEntry, vizDiv) {
           connectionEndpointIDs[varDivID] = heapObjID;
         }
       });
-
-    }
-
-  }
-
-
-  // first render the stack (and global vars)
-  renderGlobals();
-
-  // merge zombie_stack_locals and stack_locals into one master
-  // ordered list using some simple rules for aesthetics
-  var stack_to_render = [];
-
-  // first push all regular stack entries backwards
-  if (curEntry.stack_locals) {
-    for (var i = curEntry.stack_locals.length - 1; i >= 0; i--) {
-      var entry = curEntry.stack_locals[i];
-      entry.is_zombie = false;
-      entry.is_highlighted = (i == 0);
-      stack_to_render.push(entry);
-    }
-  }
-
-  // zombie stack consists of exited functions that have returned nested functions
-  // push zombie stack entries at the BEGINNING of stack_to_render,
-  // EXCEPT put zombie entries BEHIND regular entries that are their parents
-  if (curEntry.zombie_stack_locals) {
-
-    for (var i = curEntry.zombie_stack_locals.length - 1; i >= 0; i--) {
-      var entry = curEntry.zombie_stack_locals[i];
-      entry.is_zombie = true;
-      entry.is_highlighted = false; // never highlight zombie entries
-
-      // j should be 0 most of the time, so we're always inserting new
-      // elements to the front of stack_to_render (which is why we are
-      // iterating backwards over zombie_stack_locals).
-      var j = 0;
-      for (j = 0; j < stack_to_render.length; j++) {
-        if ($.inArray(stack_to_render[j].frame_id, entry.parent_frame_id_list) >= 0) {
-          continue;
-        }
-        break;
-      }
-
-      stack_to_render.splice(j, 0, entry);
     }
-
   }
 
 
-  $.each(stack_to_render, function(i, e) {
-    renderStackFrame(e, i, e.is_zombie);
-  });
-
-
-  // then render the heap
-
-  alreadyRenderedObjectIDs = {}; // set of object IDs that have already been rendered
-
-  // if addToEnd is true, then APPEND to the end of the heap,
-  // otherwise PREPEND to the front
-  function renderHeapObjectDEPRECATED(obj, addToEnd) {
-    var objectID = getObjectID(obj);
-
-    if (alreadyRenderedObjectIDs[objectID] === undefined) {
-      var toplevelHeapObjID = 'toplevel_heap_object_' + objectID;
-      var newDiv = '
';
-
-      if (addToEnd) {
-        $(vizDiv + ' #heap').append(newDiv);
-      }
-      else {
-        $(vizDiv + ' #heap').prepend(newDiv);
-      }
-      renderData(obj, $(vizDiv + ' #heap #' + toplevelHeapObjID), true);
-
-      alreadyRenderedObjectIDs[objectID] = 1;
-    }
-  }
-
-
-  // if there are multiple aliases to the same object, we want to render
-  // the one deepest in the stack, so that we can hopefully prevent
-  // objects from jumping around as functions are called and returned.
-  // e.g., if a list L appears as a global variable and as a local in a
-  // function, we want to render L when rendering the global frame.
-
-  // this is straightforward: just go through globals first and then
-  // each stack frame in order :)
-
-  $.each(curEntry.ordered_globals, function(i, varname) {
-    var val = curEntry.globals[varname];
-    if (!renderInline(val)) {
-      renderHeapObject(val, true); // APPEND
-    }
-  });
-
-
-  $.each(stack_to_render, function(i, frame) {
-    var localVars = frame.encoded_locals;
-
-    $.each(frame.ordered_varnames, function(i2, varname) {
-
-      // don't render return values for zombie frames
-      if (frame.is_zombie && varname == '__return__') {
-        return;
-      }
-
-      var val = localVars[varname];
-      if (!renderInline(val)) {
-        renderHeapObject(val, true); // APPEND
-      }
-    });
-  });
-
-  
-  // prepend heap header after all the dust settles:
-  $(vizDiv + ' #heap').prepend('
Objects
');
-
-
-  // finally connect stack variables to heap objects via connectors
+  // finally add all the connectors!
   for (varID in connectionEndpointIDs) {
     var valueID = connectionEndpointIDs[varID];
     jsPlumb.connect({source: varID, target: valueID});

From 82fae2921f1b4101be68b795310f30b131333ba8 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 4 Aug 2012 14:10:54 -0700
Subject: [PATCH 018/502] OK I THINK IT WORKS FOR NOW!

---
 PyTutorGAE/js/edu-python.js | 734 ++----------------------------------
 1 file changed, 35 insertions(+), 699 deletions(-)

diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index c4b58be25..fc86f592e 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -656,6 +656,20 @@ function renderDataStructures(curEntry, vizDiv) {
   */
 
 
+  // Heap object rendering phase:
+
+
+  // Key:   CSS ID of the div element representing the stack frame variable
+  //        (for stack->heap connections) or heap object (for heap->heap connections)
+  //        the format is: 'heap_pointer_src_'
+  // Value: CSS ID of the div element representing the value rendered in the heap
+  //        (the format is: 'heap_object_')
+  var connectionEndpointIDs = {};
+  var heapConnectionEndpointIDs = {}; // subset of connectionEndpointIDs for heap->heap connections
+
+  var heap_pointer_src_id = 1; // increment this to be unique for each heap_pointer_src_*
+
+
   var renderedObjectIDs = {}; // set (TODO: refactor all sets to use d3.map)
 
   // count all toplevelHeapLayoutIDs as already rendered since we will render them
@@ -676,9 +690,6 @@ function renderDataStructures(curEntry, vizDiv) {
     .enter().append('td')
     .attr('class', 'toplevelHeapObject')
     .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;})
-    .append('div')
-    .attr('class', 'heapObject')
-    .attr('id', function(d, i) {return 'heap_object_' + d;})
     .each(function(objID, i) {
       renderCompoundObject(objID, $(this), true); // label FOOBAR (see renderedObjectIDs)
     });
@@ -731,9 +742,30 @@ function renderDataStructures(curEntry, vizDiv) {
     if (!isTopLevel && (renderedObjectIDs[objID] != undefined)) {
       // TODO: render jsPlumb arrow source since this heap object has already been rendered
 
+      // add a stub so that we can connect it with a connector later.
+      // IE needs this div to be NON-EMPTY in order to properly
+      // render jsPlumb endpoints, so that's why we add an " "!
+
+      var srcDivID = 'heap_pointer_src_' + heap_pointer_src_id;
+      heap_pointer_src_id++; // just make sure each source has a UNIQUE ID
+      d3DomElement.append('
 
');
+
+      assert(connectionEndpointIDs[srcDivID] === undefined);
+      connectionEndpointIDs[srcDivID] = 'heap_object_' + objID;
+
+      assert(heapConnectionEndpointIDs[srcDivID] === undefined);
+      heapConnectionEndpointIDs[srcDivID] = 'heap_object_' + objID;
+
       return; // early return!
     }
 
+
+    // wrap ALL compound objects in a heapObject div so that jsPlumb
+    // connectors can point to it:
+    d3DomElement.append('
');
+    d3DomElement = $('#heap_object_' + objID);
+
+
     renderedObjectIDs[objID] = 1;
 
     var obj = curEntry.heap[objID];
@@ -889,18 +921,6 @@ function renderDataStructures(curEntry, vizDiv) {
   $(vizDiv + ' #heap').prepend('
Objects
');
 
 
-
-  // Key:   CSS ID of the div element representing the stack frame variable
-  //        (for stack->heap connections) or heap object (for heap->heap connections)
-  //        the format is: 'heap_pointer_src_'
-  // Value: CSS ID of the div element representing the value rendered in the heap
-  //        (the format is: 'heap_object_')
-  var connectionEndpointIDs = {};
-  var heapConnectionEndpointIDs = {}; // subset of connectionEndpointIDs for heap->heap connections
-
-  var heap_pointer_src_id = 1; // increment this to be unique for each heap_pointer_src_*
-
-
   // Render globals and then stack frames:
 
   // render all global variables IN THE ORDER they were created by the program,
@@ -1102,690 +1122,6 @@ function renderDataStructures(curEntry, vizDiv) {
 }
 
 
-// DEPRECATED!
-function renderDataStructuresV2(curEntry, vizDiv) {
-
-  // VERY VERY IMPORTANT --- and reset ALL jsPlumb state to prevent
-  // weird mis-behavior!!!
-  jsPlumb.reset();
-
-
-  // store a set of IDs of compound objects that have already been
-  // rendered in this particular call
-  var compound_objects_already_rendered = {};
-
-
-  $(vizDiv).empty(); // jQuery empty() is better than .html('')
-
-
-  // create a tabular layout for stack and heap side-by-side
-  // TODO: figure out how to do this using CSS in a robust way!
-  $(vizDiv).html('
');
-
-  $(vizDiv + " #stack").append('
Frames
');
-
-
-  var nonEmptyGlobals = false;
-  var curGlobalFields = {};
-  if (curEntry.globals != undefined) {
-    // use plain ole' iteration rather than jQuery $.each() since
-    // the latter breaks when a variable is named "length"
-    for (varname in curEntry.globals) {
-      curGlobalFields[varname] = true;
-      nonEmptyGlobals = true;
-    }
-  }
-
-  // Key:   CSS ID of the div element representing the variable
-  //        (or heap object, for heap->heap connections, where the
-  //        format is: 'heap_pointer_src_')
-  // Value: CSS ID of the div element representing the value rendered in the heap
-  //        (the format is: 'heap_object_')
-  var connectionEndpointIDs = {};
-  var heapConnectionEndpointIDs = {}; // subset of connectionEndpointIDs for heap->heap connections
-
-  var heap_pointer_src_id = 1; // increment this to be unique for each heap_pointer_src_*
-
-
-  // nested helper functions are SUPER-helpful!
-
-  // render the JS data object obj inside of jDomElt,
-  // which is a jQuery wrapped DOM object
-  // (obj is in a format encoded by pg_encoder.py on the backend)
-  // isTopLevel is true only if this is a top-level heap object (rather
-  // than a nested sub-object)
-  function renderData(obj, jDomElt, isTopLevel) {
-    var typ = typeof obj;
-    var oID = getObjectID(obj);
-
-    if (isPrimitiveType(obj)) {
-      // only wrap primitive types in heap objects if they are at the
-      // TOP-LEVEL (otherwise just render them inline within other data
-      // structures)
-      if (isTopLevel) {
-        jDomElt.append('
');
-        jDomElt = $('#heap_object_' + oID);
-      }
-
-      if (obj == null) {
-        jDomElt.append('None');
-      }
-      else if (typ == "number") {
-        jDomElt.append('' + obj + '');
-      }
-      else if (typ == "boolean") {
-        if (obj) {
-          jDomElt.append('True');
-        }
-        else {
-          jDomElt.append('False');
-        }
-      }
-      else if (typ == "string") {
-        // escape using htmlspecialchars to prevent HTML/script injection
-        var literalStr = htmlspecialchars(obj);
-
-        // print as a double-quoted string literal
-        literalStr = literalStr.replace(new RegExp('\"', 'g'), '\\"'); // replace ALL
-        literalStr = '"' + literalStr + '"';
-
-        jDomElt.append('' + literalStr + '');
-      }
-    }
-    else {
-      assert(typ == "object");
-      assert($.isArray(obj));
-
-      if ((compound_objects_already_rendered[oID] !== undefined) ||
-          (obj[0] == 'CIRCULAR_REF')) {
-        // render heap->heap connection
-        if (!isTopLevel) {
-          // add a stub so that we can connect it with a connector later.
-          // IE needs this div to be NON-EMPTY in order to properly
-          // render jsPlumb endpoints, so that's why we add an " "!
-
-          var srcDivID = 'heap_pointer_src_' + heap_pointer_src_id;
-          heap_pointer_src_id++; // just make sure each source has a UNIQUE ID
-          jDomElt.append('
 
');
-
-          assert(connectionEndpointIDs[srcDivID] === undefined);
-          connectionEndpointIDs[srcDivID] = 'heap_object_' + oID;
-
-          assert(heapConnectionEndpointIDs[srcDivID] === undefined);
-          heapConnectionEndpointIDs[srcDivID] = 'heap_object_' + oID;
-        }
-      }
-      else {
-        // wrap compound objects in a heapObject div so that jsPlumb
-        // connectors can point to it:
-        jDomElt.append('
');
-        jDomElt = $('#heap_object_' + oID);
-        
-        if (obj[0] == 'LIST') {
-          assert(obj.length >= 2);
-          if (obj.length == 2) {
-            jDomElt.append('
empty list
');
-          }
-          else {
-            jDomElt.append('
list
');
-
-            jDomElt.append('
');
-            var tbl = jDomElt.children('table');
-            var headerTr = tbl.find('tr:first');
-            var contentTr = tbl.find('tr:last');
-            jQuery.each(obj, function(ind, val) {
-              if (ind < 2) return; // skip 'LIST' tag and ID entry
-
-              // add a new column and then pass in that newly-added column
-              // as jDomElt to the recursive call to child:
-              headerTr.append('');
-              headerTr.find('td:last').append(ind - 2);
-
-              contentTr.append('');
-
-              // heuristic for rendering top-level 1-D linked data structures as separate top-level objects
-              // (and then drawing an arrow to the next element using a regular renderData() call)
-              if (isTopLevel && structurallyEquivalent(obj, val)) {
-                var childHeapObjectID = 'toplevel_heap_object_' + getObjectID(val);
-
-                var enclosingTr = jDomElt.parent().parent();
-                enclosingTr.append('');
-                renderData(val, enclosingTr.find('#' + childHeapObjectID), true /* isTopLevel */);
-              }
-
-              renderData(val, contentTr.find('td:last'), false);
-            });
-          }
-        }
-        else if (obj[0] == 'TUPLE') {
-          assert(obj.length >= 2);
-          if (obj.length == 2) {
-            jDomElt.append('
empty tuple
');
-          }
-          else {
-            jDomElt.append('
tuple
');
-            jDomElt.append('
');
-            var tbl = jDomElt.children('table');
-            var headerTr = tbl.find('tr:first');
-            var contentTr = tbl.find('tr:last');
-            jQuery.each(obj, function(ind, val) {
-              if (ind < 2) return; // skip 'TUPLE' tag and ID entry
-
-              // add a new column and then pass in that newly-added column
-              // as jDomElt to the recursive call to child:
-              headerTr.append('');
-              headerTr.find('td:last').append(ind - 2);
-
-              contentTr.append('');
-
-              // heuristic for rendering top-level 1-D linked data structures as separate top-level objects
-              // (and then drawing an arrow to the next element using a regular renderData() call)
-              if (isTopLevel && structurallyEquivalent(obj, val)) {
-                var childHeapObjectID = 'toplevel_heap_object_' + getObjectID(val);
-
-                var enclosingTr = jDomElt.parent().parent();
-                enclosingTr.append('');
-                renderData(val, enclosingTr.find('#' + childHeapObjectID), true /* isTopLevel */);
-              }
-
-              renderData(val, contentTr.find('td:last'), false);
-            });
-          }
-        }
-        else if (obj[0] == 'SET') {
-          assert(obj.length >= 2);
-          if (obj.length == 2) {
-            jDomElt.append('
empty set
');
-          }
-          else {
-            jDomElt.append('
set
');
-            jDomElt.append('
');
-            var tbl = jDomElt.children('table');
-            // create an R x C matrix:
-            var numElts = obj.length - 2;
-            // gives roughly a 3x5 rectangular ratio, square is too, err,
-            // 'square' and boring
-            var numRows = Math.round(Math.sqrt(numElts));
-            if (numRows > 3) {
-              numRows -= 1;
-            }
-
-            var numCols = Math.round(numElts / numRows);
-            // round up if not a perfect multiple:
-            if (numElts % numRows) {
-              numCols += 1;
-            }
-
-            jQuery.each(obj, function(ind, val) {
-              if (ind < 2) return; // skip 'SET' tag and ID entry
-
-              if (((ind - 2) % numCols) == 0) {
-                tbl.append('');
-              }
-
-              var curTr = tbl.find('tr:last');
-              curTr.append('');
-              renderData(val, curTr.find('td:last'), false);
-            });
-          }
-        }
-        else if (obj[0] == 'DICT') {
-          assert(obj.length >= 2);
-          if (obj.length == 2) {
-            jDomElt.append('
empty dict
');
-          }
-          else {
-            jDomElt.append('
dict
');
-            jDomElt.append('
');
-            var tbl = jDomElt.children('table');
-            $.each(obj, function(ind, kvPair) {
-              if (ind < 2) return; // skip 'DICT' tag and ID entry
-
-              tbl.append('');
-              var newRow = tbl.find('tr:last');
-              var keyTd = newRow.find('td:first');
-              var valTd = newRow.find('td:last');
-
-              var key = kvPair[0];
-              var val = kvPair[1];
-
-              renderData(key, keyTd, false);
-
-              // heuristic for rendering top-level 1-D linked data structures as separate top-level objects
-              // (and then drawing an arrow to the next element using a regular renderData() call)
-              if (isTopLevel && structurallyEquivalent(obj, val)) {
-                var childHeapObjectID = 'toplevel_heap_object_' + getObjectID(val);
-
-                var enclosingTr = jDomElt.parent().parent();
-                enclosingTr.append('');
-                renderData(val, enclosingTr.find('#' + childHeapObjectID), true /* isTopLevel */);
-              }
-
-              renderData(val, valTd, false);
-            });
-          }
-        }
-        else if (obj[0] == 'INSTANCE') {
-          assert(obj.length >= 3);
-          jDomElt.append('
' + obj[1] + ' instance
');
-
-          if (obj.length > 3) {
-            jDomElt.append('
');
-            var tbl = jDomElt.children('table');
-            $.each(obj, function(ind, kvPair) {
-              if (ind < 3) return; // skip type tag, class name, and ID entry
-
-              tbl.append('');
-              var newRow = tbl.find('tr:last');
-              var keyTd = newRow.find('td:first');
-              var valTd = newRow.find('td:last');
-
-              // the keys should always be strings, so render them directly (and without quotes):
-              assert(typeof kvPair[0] == "string");
-              var attrnameStr = htmlspecialchars(kvPair[0]);
-              keyTd.append('' + attrnameStr + '');
-
-              // values can be arbitrary objects, so recurse:
-              var val = kvPair[1];
-
-              // heuristic for rendering top-level 1-D linked data structures as separate top-level objects
-              // (and then drawing an arrow to the next element using a regular renderData() call)
-              if (isTopLevel && structurallyEquivalent(obj, val)) {
-                var childHeapObjectID = 'toplevel_heap_object_' + getObjectID(val);
-
-                var enclosingTr = jDomElt.parent().parent();
-                enclosingTr.append('');
-                renderData(val, enclosingTr.find('#' + childHeapObjectID), true /* isTopLevel */);
-              }
-
-              renderData(val, valTd, false);
-            });
-          }
-        }
-        else if (obj[0] == 'CLASS') {
-          assert(obj.length >= 4);
-          var superclassStr = '';
-          if (obj[3].length > 0) {
-            superclassStr += ('[extends ' + obj[3].join(',') + '] ');
-          }
-
-          jDomElt.append('
' + obj[1] + ' class ' + superclassStr + '
');
-
-          if (obj.length > 4) {
-            jDomElt.append('
');
-            var tbl = jDomElt.children('table');
-            $.each(obj, function(ind, kvPair) {
-              if (ind < 4) return; // skip type tag, class name, ID, and superclasses entries
-
-              tbl.append('');
-              var newRow = tbl.find('tr:last');
-              var keyTd = newRow.find('td:first');
-              var valTd = newRow.find('td:last');
-
-              // the keys should always be strings, so render them directly (and without quotes):
-              assert(typeof kvPair[0] == "string");
-              var attrnameStr = htmlspecialchars(kvPair[0]);
-              keyTd.append('' + attrnameStr + '');
-
-              // values can be arbitrary objects, so recurse:
-              renderData(kvPair[1], valTd, false);
-            });
-          }
-        }
-        else if (obj[0] == 'FUNCTION') {
-          assert(obj.length == 4);
-          id = obj[1];
-          funcName = htmlspecialchars(obj[2]); // for displaying names like ''
-          parentFrameID = obj[3]; // optional
-
-          if (parentFrameID) {
-            jDomElt.append('
function ' + funcName + ' [parent=f'+ parentFrameID + ']
');
-          }
-          else {
-            jDomElt.append('
function ' + funcName + '
');
-          }
-
-        }
-        else {
-          // render custom data type
-          assert(obj.length == 3);
-          typeName = obj[0];
-          id = obj[1];
-          strRepr = obj[2];
-
-          // if obj[2] is like ' at 0x84760>',
-          // then display an abbreviated version rather than the gory details
-          noStrReprRE = /<.* at 0x.*>/;
-          if (noStrReprRE.test(strRepr)) {
-            jDomElt.append('' + typeName + '');
-          }
-          else {
-            strRepr = htmlspecialchars(strRepr); // escape strings!
-
-            // warning: we're overloading tuple elts for custom data types
-            jDomElt.append('
' + typeName + '
');
-            jDomElt.append('
' + strRepr + '
');
-          }
-        }
-
-        compound_objects_already_rendered[oID] = 1; // add to set
-      }
-    }
-  }
-
-
-  function renderGlobals() {
-    // render all global variables IN THE ORDER they were created by the program,
-    // in order to ensure continuity:
-    if (curEntry.ordered_globals.length > 0) {
-      $(vizDiv + " #stack").append('
Global variables
');
-
-      $(vizDiv + " #stack #globals").append('
');
-
-      var tbl = $(vizDiv + " #global_table");
-      // iterate IN ORDER (it's possible that not all vars are in curEntry.globals)
-      $.each(curEntry.ordered_globals, function(i, varname) {
-        var val = curEntry.globals[varname];
-        // (use '!==' to do an EXACT match against undefined)
-        if (val !== undefined) { // might not be defined at this line, which is OKAY!
-          tbl.append('' + varname + '');
-          var curTr = tbl.find('tr:last');
-
-          if (renderInline(val)) {
-            renderData(val, curTr.find("td.stackFrameValue"), false /* don't wrap it in a .heapObject div */);
-          }
-          else{
-            // add a stub so that we can connect it with a connector later.
-            // IE needs this div to be NON-EMPTY in order to properly
-            // render jsPlumb endpoints, so that's why we add an " "!
-
-            // make sure varname doesn't contain any weird
-            // characters that are illegal for CSS ID's ...
-            var varDivID = 'global__' + varnameToCssID(varname);
-            curTr.find("td.stackFrameValue").append('
 
');
-
-            assert(connectionEndpointIDs[varDivID] === undefined);
-            var heapObjID = 'heap_object_' + getObjectID(val);
-            connectionEndpointIDs[varDivID] = heapObjID;
-          }
-        }
-      });
-    }
-  }
-
-  function renderStackFrame(frame, ind, is_zombie) {
-    var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
-    var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
-
-    // optional (btw, this isn't a CSS id)
-    var parentFrameID = null;
-    if (frame.parent_frame_id_list.length > 0) {
-      parentFrameID = frame.parent_frame_id_list[0];
-    }
-
-    var localVars = frame.encoded_locals
-
-    // the stackFrame div's id is simply its index ("stack")
-
-    var divClass, divID, headerDivID;
-    if (is_zombie) {
-      divClass = 'zombieStackFrame';
-      divID = "zombie_stack" + ind;
-      headerDivID = "zombie_stack_header" + ind;
-    }
-    else {
-      divClass = 'stackFrame';
-      divID = "stack" + ind;
-      headerDivID = "stack_header" + ind;
-    }
-
-    $(vizDiv + " #stack").append('
');
-
-    var headerLabel = funcName + '()';
-    if (frameID) {
-      headerLabel = 'f' + frameID + ': ' + headerLabel;
-    }
-    if (parentFrameID) {
-      headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
-    }
-    $(vizDiv + " #stack #" + divID).append('
' + headerLabel + '
');
-
-
-    if (frame.ordered_varnames.length > 0) {
-      var tableID = divID + '_table';
-      $(vizDiv + " #stack #" + divID).append('
');
-
-      var tbl = $(vizDiv + " #" + tableID);
-
-      $.each(frame.ordered_varnames, function(xxx, varname) {
-        var val = localVars[varname];
-
-        // don't render return values for zombie frames
-        if (is_zombie && varname == '__return__') {
-          return;
-        }
-
-        // special treatment for displaying return value and indicating
-        // that the function is about to return to its caller
-        //
-        // DON'T do this for zombie frames
-        if (varname == '__return__' && !is_zombie) {
-          assert(curEntry.event == 'return'); // sanity check
-
-          tbl.append('About to return');
-          tbl.append('Return value:');
-        }
-        else {
-          tbl.append('' + varname + '');
-        }
-
-        var curTr = tbl.find('tr:last');
-
-        if (renderInline(val)) {
-          renderData(val, curTr.find("td.stackFrameValue"), false /* don't wrap it in a .heapObject div */);
-        }
-        else {
-          // add a stub so that we can connect it with a connector later.
-          // IE needs this div to be NON-EMPTY in order to properly
-          // render jsPlumb endpoints, so that's why we add an " "!
-
-          // make sure varname doesn't contain any weird
-          // characters that are illegal for CSS ID's ...
-          var varDivID = divID + '__' + varnameToCssID(varname);
-          curTr.find("td.stackFrameValue").append('
 
');
-
-          assert(connectionEndpointIDs[varDivID] === undefined);
-          var heapObjID = 'heap_object_' + getObjectID(val);
-          connectionEndpointIDs[varDivID] = heapObjID;
-        }
-      });
-
-    }
-
-  }
-
-
-  // first render the stack (and global vars)
-  renderGlobals();
-
-  // merge zombie_stack_locals and stack_locals into one master
-  // ordered list using some simple rules for aesthetics
-  var stack_to_render = [];
-
-  // first push all regular stack entries backwards
-  if (curEntry.stack_locals) {
-    for (var i = curEntry.stack_locals.length - 1; i >= 0; i--) {
-      var entry = curEntry.stack_locals[i];
-      entry.is_zombie = false;
-      entry.is_highlighted = (i == 0);
-      stack_to_render.push(entry);
-    }
-  }
-
-  // zombie stack consists of exited functions that have returned nested functions
-  // push zombie stack entries at the BEGINNING of stack_to_render,
-  // EXCEPT put zombie entries BEHIND regular entries that are their parents
-  if (curEntry.zombie_stack_locals) {
-
-    for (var i = curEntry.zombie_stack_locals.length - 1; i >= 0; i--) {
-      var entry = curEntry.zombie_stack_locals[i];
-      entry.is_zombie = true;
-      entry.is_highlighted = false; // never highlight zombie entries
-
-      // j should be 0 most of the time, so we're always inserting new
-      // elements to the front of stack_to_render (which is why we are
-      // iterating backwards over zombie_stack_locals).
-      var j = 0;
-      for (j = 0; j < stack_to_render.length; j++) {
-        if ($.inArray(stack_to_render[j].frame_id, entry.parent_frame_id_list) >= 0) {
-          continue;
-        }
-        break;
-      }
-
-      stack_to_render.splice(j, 0, entry);
-    }
-
-  }
-
-
-  $.each(stack_to_render, function(i, e) {
-    renderStackFrame(e, i, e.is_zombie);
-  });
-
-
-  // then render the heap
-
-  alreadyRenderedObjectIDs = {}; // set of object IDs that have already been rendered
-
-  // if addToEnd is true, then APPEND to the end of the heap,
-  // otherwise PREPEND to the front
-  function renderHeapObject(obj, addToEnd) {
-    var objectID = getObjectID(obj);
-
-    if (alreadyRenderedObjectIDs[objectID] === undefined) {
-      var toplevelHeapObjID = 'toplevel_heap_object_' + objectID;
-      var newDiv = '
';
-
-      if (addToEnd) {
-        $(vizDiv + ' #heap').append(newDiv);
-      }
-      else {
-        $(vizDiv + ' #heap').prepend(newDiv);
-      }
-      renderData(obj, $(vizDiv + ' #heap #' + toplevelHeapObjID), true);
-
-      alreadyRenderedObjectIDs[objectID] = 1;
-    }
-  }
-
-
-  // if there are multiple aliases to the same object, we want to render
-  // the one deepest in the stack, so that we can hopefully prevent
-  // objects from jumping around as functions are called and returned.
-  // e.g., if a list L appears as a global variable and as a local in a
-  // function, we want to render L when rendering the global frame.
-
-  // this is straightforward: just go through globals first and then
-  // each stack frame in order :)
-
-  $.each(curEntry.ordered_globals, function(i, varname) {
-    var val = curEntry.globals[varname];
-    if (!renderInline(val)) {
-      renderHeapObject(val, true); // APPEND
-    }
-  });
-
-
-  $.each(stack_to_render, function(i, frame) {
-    var localVars = frame.encoded_locals;
-
-    $.each(frame.ordered_varnames, function(i2, varname) {
-
-      // don't render return values for zombie frames
-      if (frame.is_zombie && varname == '__return__') {
-        return;
-      }
-
-      var val = localVars[varname];
-      if (!renderInline(val)) {
-        renderHeapObject(val, true); // APPEND
-      }
-    });
-  });
-
-  
-  // prepend heap header after all the dust settles:
-  $(vizDiv + ' #heap').prepend('
Objects
');
-
-
-  // finally connect stack variables to heap objects via connectors
-  for (varID in connectionEndpointIDs) {
-    var valueID = connectionEndpointIDs[varID];
-    jsPlumb.connect({source: varID, target: valueID});
-  }
-
-
-  function highlight_frame(frameID) {
-    var allConnections = jsPlumb.getConnections();
-    for (var i = 0; i < allConnections.length; i++) {
-      var c = allConnections[i];
-
-      // this is VERY VERY fragile code, since it assumes that going up
-      // five layers of parent() calls will get you from the source end
-      // of the connector to the enclosing stack frame
-      var stackFrameDiv = c.source.parent().parent().parent().parent().parent();
-
-      // if this connector starts in the selected stack frame ...
-      if (stackFrameDiv.attr('id') == frameID) {
-        // then HIGHLIGHT IT!
-        c.setPaintStyle({lineWidth:1, strokeStyle: darkBlue});
-        c.endpoints[0].setPaintStyle({fillStyle: darkBlue});
-        c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
-
-        // ... and move it to the VERY FRONT
-        $(c.canvas).css("z-index", 1000);
-      }
-      // for heap->heap connectors
-      else if (heapConnectionEndpointIDs[c.endpoints[0].elementId] !== undefined) {
-        // then HIGHLIGHT IT!
-        c.setPaintStyle({lineWidth:1, strokeStyle: darkBlue}); // make thinner
-        c.endpoints[0].setPaintStyle({fillStyle: darkBlue});
-        c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
-        //c.setConnector([ "Bezier", {curviness: 80} ]); // make it more curvy
-        c.setConnector([ "StateMachine" ]);
-        c.addOverlay([ "Arrow", { length: 10, width:7, foldback:0.55, location:1 }]);
-      }
-      else {
-        // else unhighlight it
-        c.setPaintStyle({lineWidth:1, strokeStyle: lightGray});
-        c.endpoints[0].setPaintStyle({fillStyle: lightGray});
-        c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
-        $(c.canvas).css("z-index", 0);
-      }
-    }
-
-    // clear everything, then just activate $(this) one ...
-    $(".stackFrame").removeClass("highlightedStackFrame");
-    $('#' + frameID).addClass("highlightedStackFrame");
-  }
-
-
-  // highlight the top-most non-zombie stack frame or, if not available, globals
-  var frame_already_highlighted = false;
-  $.each(stack_to_render, function(i, e) {
-    if (e.is_highlighted) {
-      highlight_frame('stack' + i);
-      frame_already_highlighted = true;
-    }
-  });
-
-  if (!frame_already_highlighted) {
-    highlight_frame('globals');
-  }
-
-}
-
 function isPrimitiveType(obj) {
   var typ = typeof obj;
   return ((obj == null) || (typ != "object"));

From 40cddd860a03231328a110292908317974745d9d Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 4 Aug 2012 15:16:55 -0700
Subject: [PATCH 019/502] added VCR controls back

---
 PyTutorGAE/css/edu-python.css |  2 +-
 PyTutorGAE/js/edu-python.js   | 53 +++++++++++++++++++++++++++++++++++
 PyTutorGAE/tutor.html         |  6 +++-
 3 files changed, 59 insertions(+), 2 deletions(-)

diff --git a/PyTutorGAE/css/edu-python.css b/PyTutorGAE/css/edu-python.css
index a43b74240..a9869b153 100644
--- a/PyTutorGAE/css/edu-python.css
+++ b/PyTutorGAE/css/edu-python.css
@@ -240,7 +240,7 @@ button.smallBtn {
 /* VCR control buttons for stepping through execution */
 
 #vcrControls {
-  margin-top: 10px;
+  margin-top: 15px;
   margin-bottom: 15px;
 }
 
diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index fc86f592e..392086b76 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -280,6 +280,23 @@ function updateOutput() {
   }
 
 
+  $("#vcrControls #jmpFirstInstr").attr("disabled", false);
+  $("#vcrControls #jmpStepBack").attr("disabled", false);
+  $("#vcrControls #jmpStepFwd").attr("disabled", false);
+  $("#vcrControls #jmpLastInstr").attr("disabled", false);
+
+  if (curInstr == 0) {
+    $("#vcrControls #jmpFirstInstr").attr("disabled", true);
+    $("#vcrControls #jmpStepBack").attr("disabled", true);
+  }
+  if (curInstr == (totalInstrs-1)) {
+    $("#vcrControls #jmpLastInstr").attr("disabled", true);
+    $("#vcrControls #jmpStepFwd").attr("disabled", true);
+  }
+
+
+
+
   // PROGRAMMATICALLY change the value, so evt.originalEvent should be undefined
   $('#executionSlider').slider('value', curInstr);
 
@@ -921,7 +938,10 @@ function renderDataStructures(curEntry, vizDiv) {
   $(vizDiv + ' #heap').prepend('
Objects
');
 
 
+
   // Render globals and then stack frames:
+  // TODO: could convert to using d3 to map globals and stack frames directly into stack frame divs
+  // (which might make it easier to do smooth transitions)
 
   // render all global variables IN THE ORDER they were created by the program,
   // in order to ensure continuity:
@@ -1447,6 +1467,39 @@ function clearSliderBreakpoints() {
 
 // initialization function that should be called when the page is loaded
 function eduPythonCommonInit() {
+
+  $("#jmpFirstInstr").click(function() {
+    curInstr = 0;
+    updateOutput();
+  });
+
+  $("#jmpLastInstr").click(function() {
+    curInstr = curTrace.length - 1;
+    updateOutput();
+  });
+
+  $("#jmpStepBack").click(function() {
+    if (curInstr > 0) {
+      curInstr -= 1;
+      updateOutput();
+    }
+  });
+
+  $("#jmpStepFwd").click(function() {
+    if (curInstr < curTrace.length - 1) {
+      curInstr += 1;
+      updateOutput();
+    }
+  });
+
+  // disable controls initially ...
+  $("#vcrControls #jmpFirstInstr").attr("disabled", true);
+  $("#vcrControls #jmpStepBack").attr("disabled", true);
+  $("#vcrControls #jmpStepFwd").attr("disabled", true);
+  $("#vcrControls #jmpLastInstr").attr("disabled", true);
+
+
+
   // set some sensible jsPlumb defaults
   jsPlumb.Defaults.Endpoint = ["Dot", {radius:3}];
   //jsPlumb.Defaults.Endpoint = ["Rectangle", {width:3, height:3}];
diff --git a/PyTutorGAE/tutor.html b/PyTutorGAE/tutor.html
index f211de028..5265362f8 100644
--- a/PyTutorGAE/tutor.html
+++ b/PyTutorGAE/tutor.html
@@ -172,7 +172,11 @@
 

 
 

-  
+  
+  
+  Step ? of ?
+  
+  
 

 
 

From a709e60626ac0be6886cfc185c92e359325a6c20 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 4 Aug 2012 16:17:34 -0700
Subject: [PATCH 020/502] display syntax errors in edit mode without jumping to
 viz mode

---
 PyTutorGAE/css/edu-python.css     |  4 ++++
 PyTutorGAE/js/edu-python-tutor.js | 35 +++++++++++++++++++++++++------
 2 files changed, 33 insertions(+), 6 deletions(-)

diff --git a/PyTutorGAE/css/edu-python.css b/PyTutorGAE/css/edu-python.css
index a9869b153..33718fb00 100644
--- a/PyTutorGAE/css/edu-python.css
+++ b/PyTutorGAE/css/edu-python.css
@@ -698,3 +698,7 @@ div#submittedSolutionDisplay {
   fill: #F15149;
 }
 
+
+/* necessary for CodeMirror line highlighting to work! */
+.CodeMirror .errorLine { background: #F89D99 !important; }
+
diff --git a/PyTutorGAE/js/edu-python-tutor.js b/PyTutorGAE/js/edu-python-tutor.js
index 3dd644b7d..8dcb226fa 100644
--- a/PyTutorGAE/js/edu-python-tutor.js
+++ b/PyTutorGAE/js/edu-python-tutor.js
@@ -58,7 +58,7 @@ $(document).ready(function() {
   pyInputCodeMirror = CodeMirror(document.getElementById('codeInputPane'), {
     mode: 'python',
     lineNumbers: true,
-    tabSize: 2,
+    tabSize: 2
   });
 
   pyInputCodeMirror.setSize(null, '450px');
@@ -133,11 +133,34 @@ $(document).ready(function() {
 
     // TODO: is GET or POST best here?
     $.get("exec",
-           {user_script : pyInputCodeMirror.getValue()},
-           function(traceData) {
-             enterVisualizeMode(traceData, pyInputCodeMirror.getValue());
-           },
-           "json");
+          {user_script : pyInputCodeMirror.getValue()},
+          function(traceData) {
+            // don't enter visualize mode if there are killer errors:
+            if (!traceData ||
+                ((traceData.length == 1) && traceData[0].event == 'uncaught_exception')) {
+              var errorLineNo = traceData[0].line - 1; /* CodeMirror lines are zero-indexed */
+              if (errorLineNo !== undefined) {
+                // highlight the faulting line in pyInputCodeMirror
+                pyInputCodeMirror.focus();
+                pyInputCodeMirror.setCursor(errorLineNo, 0);
+                pyInputCodeMirror.setLineClass(errorLineNo, null, 'errorLine');
+
+                pyInputCodeMirror.setOption('onChange', function() {
+                  pyInputCodeMirror.setLineClass(errorLineNo, null, null); // reset line back to normal
+                  pyInputCodeMirror.setOption('onChange', null); // cancel
+                });
+              }
+
+              alert(traceData[0].exception_msg);
+
+              $('#executeBtn').html("Visualize execution");
+              $('#executeBtn').attr('disabled', false);
+            }
+            else {
+              enterVisualizeMode(traceData, pyInputCodeMirror.getValue());
+            }
+          },
+          "json");
   });
 
 

From 403a285a06535f0fc975bcb7678ca3269422bfcf Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 4 Aug 2012 16:23:20 -0700
Subject: [PATCH 021/502] bleh

---
 PyTutorGAE/js/edu-python.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 392086b76..fc98d99e2 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -1590,7 +1590,10 @@ function eduPythonCommonInit() {
 
   // log a generic AJAX error handler
   $(document).ajaxError(function() {
-    alert("Uh oh, the server returned an error, boo :(  Please reload the page and try executing a different Python script.");
+    alert("Server error (possibly due to memory/resource overload).");
+
+    $('#executeBtn').html("Visualize execution");
+    $('#executeBtn').attr('disabled', false);
   });
 
 }

From 4497ce9025af54c88a7838576c92f4d112ba20ea Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 4 Aug 2012 17:10:52 -0700
Subject: [PATCH 022/502] separate hover and clicked breakpoints

---
 PyTutorGAE/css/edu-python.css |  4 ---
 PyTutorGAE/js/edu-python.js   | 50 ++++++++++++++++++++++++++++++-----
 2 files changed, 43 insertions(+), 11 deletions(-)

diff --git a/PyTutorGAE/css/edu-python.css b/PyTutorGAE/css/edu-python.css
index 33718fb00..13667623e 100644
--- a/PyTutorGAE/css/edu-python.css
+++ b/PyTutorGAE/css/edu-python.css
@@ -694,10 +694,6 @@ div#submittedSolutionDisplay {
   margin-top: -7px; /* make it butt up against #executionSlider */
 }
 
-#sliderOverlay {
-  fill: #F15149;
-}
-
 
 /* necessary for CodeMirror line highlighting to work! */
 .CodeMirror .errorLine { background: #F89D99 !important; }
diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index fc98d99e2..95a2fd330 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -44,12 +44,15 @@ var visitedLineColor = '#3D58A2';
 
 var lightGray = "#cccccc";
 var darkBlue = "#3D58A2";
+var medBlue = "#41507A";
+var medLightBlue = "#6F89D1";
 var lightBlue = "#899CD1";
 var pinkish = "#F15149";
 var lightPink = "#F89D99";
 var darkRed = "#9D1E18";
 
 var breakpointColor = pinkish;
+var hoverBreakpointColor = medLightBlue;
 
 
 var keyStuckDown = false;
@@ -1265,14 +1268,18 @@ function renderPyCodeOutput(codeStr) {
       }
      })
     .on('mouseover', function() {
-      setBreakpoint(this);
+      setHoverBreakpoint(this);
      })
     .on('mouseout', function() {
+      hoverBreakpoints = {};
+
       var breakpointHere = d3.select(this).datum().breakpointHere;
 
       if (!breakpointHere) {
         unsetBreakpoint(this);
       }
+
+      renderSliderBreakpoints(); // get rid of hover breakpoint colors
      })
     .on('mousedown', function() {
       // don't do anything if exePts is empty
@@ -1299,13 +1306,14 @@ function renderPyCodeOutput(codeStr) {
 
 
 
-var breakpointLines = {}; // set of lines to set as breakpoints
+var breakpoints = {}; // set of execution points to set as breakpoints
 var sortedBreakpointsList = []; // sorted and synced with breakpointLines
+var hoverBreakpoints = {}; // set of breakpoints because we're HOVERING over a given line
 
 
 function _getSortedBreakpointsList() {
   var ret = [];
-  for (var k in breakpointLines) {
+  for (var k in breakpoints) {
     ret.push(Number(k)); // these should be NUMBERS, not strings
   }
   ret.sort(function(x,y){return x-y}); // WTF, javascript sort is lexicographic by default!
@@ -1314,7 +1322,7 @@ function _getSortedBreakpointsList() {
 
 function addToBreakpoints(executionPoints) {
   $.each(executionPoints, function(i, e) {
-    breakpointLines[e] = 1;
+    breakpoints[e] = 1;
   });
 
   sortedBreakpointsList = _getSortedBreakpointsList();
@@ -1322,7 +1330,7 @@ function addToBreakpoints(executionPoints) {
 
 function removeFromBreakpoints(executionPoints) {
   $.each(executionPoints, function(i, e) {
-    delete breakpointLines[e];
+    delete breakpoints[e];
   });
 
   sortedBreakpointsList = _getSortedBreakpointsList();
@@ -1378,6 +1386,25 @@ function findNextBreakpoint(c) {
 }
 
 
+function setHoverBreakpoint(t) {
+  var exePts = d3.select(t).datum().executionPoints;
+
+  // don't do anything if exePts is empty
+  // (i.e., this line was never executed)
+  if (!exePts || exePts.length == 0) {
+    return;
+  }
+
+  hoverBreakpoints = {};
+  $.each(exePts, function(i, e) {
+    hoverBreakpoints[e] = 1;
+  });
+
+  addToBreakpoints(exePts);
+  renderSliderBreakpoints();
+}
+
+
 function setBreakpoint(t) {
   var exePts = d3.select(t).datum().executionPoints;
 
@@ -1453,13 +1480,22 @@ function renderSliderBreakpoints() {
       })
       .attr('y', 0)
       .attr('width', 2)
-      .attr('height', 12);
+      .attr('height', 12)
+      .style('fill', function(d) {
+         if (hoverBreakpoints[d] === undefined) {
+           return breakpointColor;
+         }
+         else {
+           return hoverBreakpointColor;
+         }
+       });
 }
 
 
 function clearSliderBreakpoints() {
-  breakpointLines = {};
+  breakpoints = {};
   sortedBreakpointsList = [];
+  hoverBreakpoints = {};
   renderSliderBreakpoints();
 }
 

From ad6bf8787d50317bfecae747788412e406273772 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 4 Aug 2012 17:13:58 -0700
Subject: [PATCH 023/502] subtle usability improvement for LEFT and RIGHT
 arrows

---
 PyTutorGAE/js/edu-python.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 95a2fd330..15699281d 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -1570,6 +1570,9 @@ function eduPythonCommonInit() {
             if (prevBreakpoint != -1) {
               curInstr = prevBreakpoint;
             }
+            else {
+              curInstr -= 1; // prevent keyboard keys from "getting stuck" on a solitary breakpoint
+            }
           }
           else {
             curInstr -= 1;
@@ -1589,6 +1592,9 @@ function eduPythonCommonInit() {
             if (nextBreakpoint != -1) {
               curInstr = nextBreakpoint;
             }
+            else {
+              curInstr += 1; // prevent keyboard keys from "getting stuck" on a solitary breakpoint
+            }
           }
           else {
             curInstr += 1;

From a070709bc7bf9a66d05a92fd2112fec613841b0b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 4 Aug 2012 17:26:47 -0700
Subject: [PATCH 024/502] minor

---
 PyTutorGAE/css/edu-python.css | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/PyTutorGAE/css/edu-python.css b/PyTutorGAE/css/edu-python.css
index 13667623e..6cb3807f5 100644
--- a/PyTutorGAE/css/edu-python.css
+++ b/PyTutorGAE/css/edu-python.css
@@ -383,13 +383,10 @@ table.dictTbl {
   border-spacing: 1px;
 }
 
-table.dictTbl tr.dictEntry {
-  border: 1px #111111 solid;
-}
 
 table.dictTbl td.dictKey,
 table.instTbl td.instKey {
-  background-color: #ffffff;
+  background-color: white;
 }
 
 table.dictTbl,
@@ -440,6 +437,7 @@ table.instTbl {
   border-spacing: 1px;
 }
 
+table.dictTbl tr.dictEntry,
 table.instTbl tr.instEntry {
   border: 1px #555555 solid;
 }

From f31edd99a1fc4e3193c6abe0f56a39b441d79282 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 4 Aug 2012 23:02:27 -0700
Subject: [PATCH 025/502] try some experimental D3 stuff

---
 PyTutorGAE/js/tmp-mess-with-d3/edu-python.js | 1684 ++++++++++++++++++
 PyTutorGAE/js/tmp-mess-with-d3/tutor.html    |  255 +++
 2 files changed, 1939 insertions(+)
 create mode 100644 PyTutorGAE/js/tmp-mess-with-d3/edu-python.js
 create mode 100644 PyTutorGAE/js/tmp-mess-with-d3/tutor.html

diff --git a/PyTutorGAE/js/tmp-mess-with-d3/edu-python.js b/PyTutorGAE/js/tmp-mess-with-d3/edu-python.js
new file mode 100644
index 000000000..947f9f568
--- /dev/null
+++ b/PyTutorGAE/js/tmp-mess-with-d3/edu-python.js
@@ -0,0 +1,1684 @@
+/*
+
+Online Python Tutor
+https://github.com/pgbovine/OnlinePythonTutor/
+
+Copyright (C) 2010-2012 Philip J. Guo (philip@pgbovine.net)
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+*/
+
+
+// TODO: look into using the d3.map class instead of direct object operations in js,
+// since the latter might exhibit funny behavior for certain reserved keywords
+
+
+// code that is common to all Online Python Tutor pages
+
+var appMode = 'edit'; // 'edit', 'visualize', or 'grade' (only for question.html)
+
+
+/* colors - see edu-python.css */
+var lightYellow = '#F5F798';
+var lightLineColor = '#FFFFCC';
+var errorColor = '#F87D76';
+var visitedLineColor = '#3D58A2';
+
+var lightGray = "#cccccc";
+var darkBlue = "#3D58A2";
+var medBlue = "#41507A";
+var medLightBlue = "#6F89D1";
+var lightBlue = "#899CD1";
+var pinkish = "#F15149";
+var lightPink = "#F89D99";
+var darkRed = "#9D1E18";
+
+var breakpointColor = pinkish;
+var hoverBreakpointColor = medLightBlue;
+
+
+var keyStuckDown = false;
+
+
+// ugh globals! should really refactor into a "current state" object or
+// something like that ...
+var curTrace = null;
+var curInputCode = null;
+var curInstr = 0;
+
+var preseededCode = null;     // if you passed in a 'code=' in the URL, then set this var
+var preseededCurInstr = null; // if you passed in a 'curInstr=' in the URL, then set this var
+
+
+// an array of objects with the following fields:
+//   'text' - the text of the line of code
+//   'lineNumber' - one-indexed (always the array index + 1)
+//   'executionPoints' - an ordered array of zero-indexed execution points where this line was executed
+//   'backgroundColor' - current code output line background color
+//   'breakpointHere' - has a breakpoint been set here?
+var codeOutputLines = [];
+
+var visitedLinesSet = {} // YUCKY GLOBAL!
+
+
+
+// true iff trace ended prematurely since maximum instruction limit has
+// been reached
+var instrLimitReached = false;
+
+function assert(cond) {
+  if (!cond) {
+    alert("Error: ASSERTION FAILED");
+  }
+}
+
+// taken from http://www.toao.net/32-my-htmlspecialchars-function-for-javascript
+function htmlspecialchars(str) {
+  if (typeof(str) == "string") {
+    str = str.replace(/&/g, "&"); /* must do & first */
+
+    // ignore these for now ...
+    //str = str.replace(/"/g, """);
+    //str = str.replace(/'/g, "'");
+
+    str = str.replace(//g, ">");
+
+    // replace spaces:
+    str = str.replace(/ /g, " ");
+  }
+  return str;
+}
+
+function processTrace(jumpToEnd) {
+  curInstr = 0;
+
+  // only do this at most ONCE, and then clear out preseededCurInstr
+  if (preseededCurInstr && preseededCurInstr < curTrace.length) { // NOP anyways if preseededCurInstr is 0
+    curInstr = preseededCurInstr;
+    preseededCurInstr = null;
+  }
+
+  // delete all stale output
+  $("#pyStdout").val('');
+
+  if (curTrace.length > 0) {
+    var lastEntry = curTrace[curTrace.length - 1];
+
+    // GLOBAL!
+    instrLimitReached = (lastEntry.event == 'instruction_limit_reached');
+
+    if (instrLimitReached) {
+      curTrace.pop() // kill last entry
+      var warningMsg = lastEntry.exception_msg;
+      $("#errorOutput").html(htmlspecialchars(warningMsg));
+      $("#errorOutput").show();
+    }
+    // as imran suggests, for a (non-error) one-liner, SNIP off the
+    // first instruction so that we start after the FIRST instruction
+    // has been executed ...
+    else if (curTrace.length == 2) {
+      curTrace.shift();
+    }
+
+
+    if (jumpToEnd) {
+      // if there's an exception, then jump to the FIRST occurrence of
+      // that exception.  otherwise, jump to the very end of execution.
+      curInstr = curTrace.length - 1;
+
+      for (var i = 0; i < curTrace.length; i++) {
+        var curEntry = curTrace[i];
+        if (curEntry.event == 'exception' ||
+            curEntry.event == 'uncaught_exception') {
+          curInstr = i;
+          break;
+        }
+      }
+    }
+
+  }
+
+
+  // remove any existing sliders
+  $('#executionSlider').slider('destroy');
+  $('#executionSlider').empty();
+
+  $('#executionSlider').slider({
+    min: 0,
+    max: curTrace.length - 1,
+    step: 1
+
+  });
+
+  //disable keyboard actions on the slider itself (to prevent double-firing of events)
+  $("#executionSlider .ui-slider-handle").unbind('keydown');
+  // make skinnier and taller
+  $("#executionSlider .ui-slider-handle").css('width', '0.8em');
+  $("#executionSlider .ui-slider-handle").css('height', '1.4em');
+
+  $(".ui-widget-content").css('font-size', '0.9em');
+ 
+  updateOutput();
+}
+
+function highlightCodeLine(curLine, hasError, isTerminated) {
+  d3.selectAll('#pyCodeOutputDiv td.lineNo')
+    .attr('id', function(d) {return 'lineNo' + d.lineNumber;})
+    .style('color', function(d)
+      {return d.breakpointHere ? breakpointColor : (visitedLinesSet[d.lineNumber] ? visitedLineColor : null);})
+    .style('font-weight', function(d)
+      {return d.breakpointHere ? 'bold' : (visitedLinesSet[d.lineNumber] ? 'bold' : null);});
+
+  d3.selectAll('#pyCodeOutputDiv td.cod')
+    .style('background-color', function(d) {
+      if (d.lineNumber == curLine) {
+        if (hasError) {
+          d.backgroundColor = errorColor;
+        }
+        else if (isTerminated) {
+          d.backgroundColor = lightBlue;
+        }
+        else {
+          d.backgroundColor = lightLineColor;
+        }
+      }
+      else {
+        d.backgroundColor = null;
+      }
+
+      return d.backgroundColor;
+    })
+    .style('border-top', function(d) {
+      if ((d.lineNumber == curLine) && !hasError && !isTerminated) {
+        return '1px solid #F87D76';
+      }
+      else {
+        // put a default white top border to keep space usage consistent
+        return '1px solid #ffffff';
+      }
+    });
+
+  // smoothly scroll code display
+  if (!isOutputLineVisible(curLine)) {
+    scrollCodeOutputToLine(curLine);
+  }
+}
+
+
+// smoothly scroll pyCodeOutputDiv so that the given line is at the center
+function scrollCodeOutputToLine(lineNo) {
+  var lineNoTd = $('#lineNo' + lineNo);
+  var LO = lineNoTd.offset().top;
+
+  var codeOutputDiv = $('#pyCodeOutputDiv');
+  var PO = codeOutputDiv.offset().top;
+  var ST = codeOutputDiv.scrollTop();
+  var H = codeOutputDiv.height();
+
+  codeOutputDiv.animate({scrollTop: (ST + (LO - PO - (Math.round(H / 2))))}, 300);
+}
+
+
+// returns True iff lineNo is visible in pyCodeOutputDiv
+function isOutputLineVisible(lineNo) {
+  var lineNoTd = $('#lineNo' + lineNo);
+  var LO = lineNoTd.offset().top;
+
+  var codeOutputDiv = $('#pyCodeOutputDiv');
+  var PO = codeOutputDiv.offset().top;
+  var ST = codeOutputDiv.scrollTop();
+  var H = codeOutputDiv.height();
+
+  // add a few pixels of fudge factor on the bottom end due to bottom scrollbar
+  return (PO <= LO) && (LO < (PO + H - 15));
+}
+
+
+
+// relies on curTrace and curInstr globals
+function updateOutput() {
+  if (!curTrace) {
+    return;
+  }
+
+  $('#urlOutput').val(''); // blank out
+
+  var curEntry = curTrace[curInstr];
+  var hasError = false;
+
+  // render VCR controls:
+  var totalInstrs = curTrace.length;
+
+  // to be user-friendly, if we're on the LAST instruction, print "Program has terminated"
+  // and DON'T highlight any lines of code in the code display
+  if (curInstr == (totalInstrs-1)) {
+    if (instrLimitReached) {
+      $("#vcrControls #curInstr").html("Instruction limit reached");
+    }
+    else {
+      $("#vcrControls #curInstr").html("Program has terminated");
+    }
+  }
+  else {
+    $("#vcrControls #curInstr").html("About to run step " + (curInstr + 1) + " of " + (totalInstrs-1));
+  }
+
+
+  $("#vcrControls #jmpFirstInstr").attr("disabled", false);
+  $("#vcrControls #jmpStepBack").attr("disabled", false);
+  $("#vcrControls #jmpStepFwd").attr("disabled", false);
+  $("#vcrControls #jmpLastInstr").attr("disabled", false);
+
+  if (curInstr == 0) {
+    $("#vcrControls #jmpFirstInstr").attr("disabled", true);
+    $("#vcrControls #jmpStepBack").attr("disabled", true);
+  }
+  if (curInstr == (totalInstrs-1)) {
+    $("#vcrControls #jmpLastInstr").attr("disabled", true);
+    $("#vcrControls #jmpStepFwd").attr("disabled", true);
+  }
+
+
+
+
+  // PROGRAMMATICALLY change the value, so evt.originalEvent should be undefined
+  $('#executionSlider').slider('value', curInstr);
+
+
+  // render error (if applicable):
+  if (curEntry.event == 'exception' ||
+      curEntry.event == 'uncaught_exception') {
+    assert(curEntry.exception_msg);
+
+    if (curEntry.exception_msg == "Unknown error") {
+      $("#errorOutput").html('Unknown error: Please email a bug report to philip@pgbovine.net');
+    }
+    else {
+      $("#errorOutput").html(htmlspecialchars(curEntry.exception_msg));
+    }
+
+    $("#errorOutput").show();
+
+    hasError = true;
+  }
+  else {
+    if (!instrLimitReached) { // ugly, I know :/
+      $("#errorOutput").hide();
+    }
+  }
+
+
+  // render code output:
+  if (curEntry.line) {
+    // calculate all lines that have been 'visited' 
+    // by execution up to (but NOT INCLUDING) curInstr:
+    visitedLinesSet = {} // GLOBAL!
+    for (var i = 0; i < curInstr; i++) {
+      if (curTrace[i].line) {
+        visitedLinesSet[curTrace[i].line] = true;
+      }
+    }
+
+    highlightCodeLine(curEntry.line, hasError,
+                      /* if instrLimitReached, then treat like a normal non-terminating line */
+                      (!instrLimitReached && (curInstr == (totalInstrs-1))));
+  }
+
+
+  // render stdout:
+
+  // keep original horizontal scroll level:
+  var oldLeft = $("#pyStdout").scrollLeft();
+  $("#pyStdout").val(curEntry.stdout);
+
+  $("#pyStdout").scrollLeft(oldLeft);
+  // scroll to bottom, though:
+  $("#pyStdout").scrollTop($("#pyStdout")[0].scrollHeight);
+
+
+  // finally, render all the data structures!!!
+  renderDataStructures(curEntry, "#dataViz");
+}
+
+
+// make sure varname doesn't contain any weird
+// characters that are illegal for CSS ID's ...
+//
+// I know for a fact that iterator tmp variables named '_[1]'
+// are NOT legal names for CSS ID's.
+// I also threw in '{', '}', '(', ')', '<', '>' as illegal characters.
+//
+// TODO: what other characters are illegal???
+var lbRE = new RegExp('\\[|{|\\(|<', 'g');
+var rbRE = new RegExp('\\]|}|\\)|>', 'g');
+function varnameToCssID(varname) {
+  return varname.replace(lbRE, 'LeftB_').replace(rbRE, '_RightB');
+}
+
+
+// compare two JSON-encoded compound objects for structural equivalence:
+function structurallyEquivalent(obj1, obj2) {
+  // punt if either isn't a compound type
+  if (isPrimitiveType(obj1) || isPrimitiveType(obj2)) {
+    return false;
+  }
+
+  // must be the same compound type
+  if (obj1[0] != obj2[0]) {
+    return false;
+  }
+
+  // must have the same number of elements or fields
+  if (obj1.length != obj2.length) {
+    return false;
+  }
+
+  // for a list or tuple, same size (e.g., a cons cell is a list/tuple of size 2)
+  if (obj1[0] == 'LIST' || obj1[0] == 'TUPLE') {
+    return true;
+  }
+  else {
+    var startingInd = -1;
+
+    if (obj1[0] == 'DICT') {
+      startingInd = 2;
+    }
+    else if (obj1[0] == 'INSTANCE') {
+      startingInd = 3;
+    }
+    else {
+      return false;
+    }
+
+    var obj1fields = {};
+
+    // for a dict or object instance, same names of fields (ordering doesn't matter)
+    for (var i = startingInd; i < obj1.length; i++) {
+      obj1fields[obj1[i][0]] = 1; // use as a set
+    }
+
+    for (var i = startingInd; i < obj2.length; i++) {
+      if (obj1fields[obj2[i][0]] == undefined) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+}
+
+
+
+// Renders the current trace entry (curEntry) into the div named by vizDiv
+//
+// The "3.0" version of renderDataStructures renders variables in
+// a stack, values in a separate heap, and draws line connectors
+// to represent both stack->heap object references and, more importantly,
+// heap->heap references. This version was created in August 2012.
+//
+// The "2.0" version of renderDataStructures renders variables in
+// a stack and values in a separate heap, with data structure aliasing
+// explicitly represented via line connectors (thanks to jsPlumb lib).
+// This version was created in September 2011.
+//
+// The ORIGINAL "1.0" version of renderDataStructures
+// was created in January 2010 and rendered variables and values
+// INLINE within each stack frame without any explicit representation
+// of data structure aliasing. That is, aliased objects were rendered
+// multiple times, and a unique ID label was used to identify aliases.
+function renderDataStructures(curEntry, vizDiv) {
+
+  // VERY VERY IMPORTANT --- and reset ALL jsPlumb state to prevent
+  // weird mis-behavior!!!
+  jsPlumb.reset();
+
+
+  // create a tabular layout for stack and heap side-by-side
+  // TODO: figure out how to do this using CSS in a robust way!
+
+  $(vizDiv + " #stack").empty(); // clear the stack and redraw it from scratch
+                                 // (but don't clear the heap, since we
+                                 // want it to be persistent for use with d3)
+
+  $(vizDiv + " #stack").append('
Frames
');
+
+
+  // merge zombie_stack_locals and stack_locals into one master
+  // ordered list using some simple rules for aesthetics
+  var stack_to_render = [];
+
+  // first push all regular stack entries backwards
+  if (curEntry.stack_locals) {
+    for (var i = curEntry.stack_locals.length - 1; i >= 0; i--) {
+      var entry = curEntry.stack_locals[i];
+      entry.is_zombie = false;
+      entry.is_highlighted = (i == 0);
+      stack_to_render.push(entry);
+    }
+  }
+
+  // zombie stack consists of exited functions that have returned nested functions
+  // push zombie stack entries at the BEGINNING of stack_to_render,
+  // EXCEPT put zombie entries BEHIND regular entries that are their parents
+  if (curEntry.zombie_stack_locals) {
+
+    for (var i = curEntry.zombie_stack_locals.length - 1; i >= 0; i--) {
+      var entry = curEntry.zombie_stack_locals[i];
+      entry.is_zombie = true;
+      entry.is_highlighted = false; // never highlight zombie entries
+
+      // j should be 0 most of the time, so we're always inserting new
+      // elements to the front of stack_to_render (which is why we are
+      // iterating backwards over zombie_stack_locals).
+      var j = 0;
+      for (j = 0; j < stack_to_render.length; j++) {
+        if ($.inArray(stack_to_render[j].frame_id, entry.parent_frame_id_list) >= 0) {
+          continue;
+        }
+        break;
+      }
+
+      stack_to_render.splice(j, 0, entry);
+    }
+
+  }
+
+
+  // first build up a list of lists representing the locations of TOP-LEVEL heap objects to be rendered.
+  // doing so decouples the data format of curEntry from the nitty-gritty HTML rendering code,
+  // which gives us more flexibility in experimenting with layout strategies.
+  //
+  // each outer list represents a "row" in the heap layout (represented via, say, div elements)
+  // and each inner list represents "columns" within a row (represented via, say, table td elements)
+  var toplevelHeapLayout = [];
+  var toplevelHeapLayoutIDs = {}; // set of IDs contained within toplevelHeapLayout
+  var alreadyLaidObjectIDs = {};  // set of IDs of objects that have already been laid out
+                                  // (not necessarily just in toplevelHeapLayout since some elements
+                                  //  are EMBEDDED within other heap objects)
+
+
+  function layoutHeapObject(ref) {
+
+    function layoutHeapObjectHelper(id, row /* list of IDs */, isTopLevel) {
+      if (alreadyLaidObjectIDs[id] == undefined) {
+
+        // Only push to row if isTopLevel since it only stores top-level objects ...
+        if (isTopLevel) {
+          row.push(id);
+        }
+
+        // but ALWAYS record that this object has already been laid out, no matter what 
+        alreadyLaidObjectIDs[id] = 1;
+
+        // heuristic for laying out 1-D linked data structures: check for enclosing elements that are
+        // structurally identical and then lay them out as siblings in the same "row"
+        var heapObj = curEntry.heap[id];
+        assert(heapObj);
+
+        if (heapObj[0] == 'LIST' || heapObj[0] == 'TUPLE') {
+          jQuery.each(heapObj, function(ind, child) {
+            if (ind < 1) return; // skip type tag
+
+            if (!isPrimitiveType(child)) {
+              var childID = getRefID(child);
+              if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
+                layoutHeapObjectHelper(childID, row, true);
+              }
+              else {
+                layoutHeapObjectHelper(childID, null, false /* render embedded within heapObj */);
+              }
+            }
+          });
+        }
+        else if (heapObj[0] == 'SET') {
+          jQuery.each(heapObj, function(ind, child) {
+            if (ind < 1) return; // skip type tag
+            if (!isPrimitiveType(child)) {
+              layoutHeapObjectHelper(getRefID(child), null, false /* render embedded within heapObj */);
+            }
+          });
+        }
+        else if (heapObj[0] == 'DICT') {
+          jQuery.each(heapObj, function(ind, child) {
+            if (ind < 1) return; // skip type tag
+
+            var dictKey = child[0];
+            if (!isPrimitiveType(dictKey)) {
+              layoutHeapObjectHelper(getRefID(dictKey), null, false /* render embedded within heapObj */);
+            }
+
+            var dictVal = child[1];
+            if (!isPrimitiveType(dictVal)) {
+              var childID = getRefID(dictVal);
+              if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
+                layoutHeapObjectHelper(childID, row, true);
+              }
+              else {
+                layoutHeapObjectHelper(childID, null, false /* render embedded within heapObj */);
+              }
+            }
+          });
+        }
+        else if (heapObj[0] == 'INSTANCE') {
+          jQuery.each(heapObj, function(ind, child) {
+            if (ind < 2) return; // skip type tag and class name
+
+            // instance keys are always strings, so no need to recurse
+            assert(typeof child[0] == "string");
+
+            var instVal = child[1];
+            if (!isPrimitiveType(instVal)) {
+              var childID = getRefID(instVal);
+              if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
+                layoutHeapObjectHelper(childID, row, true);
+              }
+              else {
+                layoutHeapObjectHelper(childID, null, false /* render embedded within heapObj */);
+              }
+            }
+          });
+        }
+        else if (heapObj[0] == 'CLASS') {
+          jQuery.each(heapObj, function(ind, child) {
+            if (ind < 3) return; // skip type tag, class name, and superclass names
+            // class attr keys are always strings, so no need to recurse
+
+            var classAttrVal = child[1];
+            if (!isPrimitiveType(classAttrVal)) {
+              layoutHeapObjectHelper(getRefID(classAttrVal), null, false /* render embedded within heapObj */);
+            }
+          });
+        }
+      }
+    }
+
+    var id = getRefID(ref);
+    var newRow = [];
+
+    layoutHeapObjectHelper(id, newRow, true);
+    if (newRow.length > 0) {
+      toplevelHeapLayout.push(newRow);
+      $.each(newRow, function(i, e) {
+        toplevelHeapLayoutIDs[e] = 1;
+      });
+    }
+  }
+
+
+
+  // variables are displayed in the following order, so lay out heap objects in the same order:
+  //   - globals
+  //   - stack entries (regular and zombies)
+
+  // if there are multiple aliases to the same object, we want to render
+  // the one "deepest" in the stack, so that we can hopefully prevent
+  // objects from jumping around as functions are called and returned.
+  // e.g., if a list L appears as a global variable and as a local in a
+  // function, we want to render L when rendering the global frame.
+  //
+  // this is straightforward: just go through globals first and then
+  // each stack frame in order :)
+
+  $.each(curEntry.ordered_globals, function(i, varname) {
+    var val = curEntry.globals[varname];
+    // (use '!==' to do an EXACT match against undefined)
+    if (val !== undefined) { // might not be defined at this line, which is OKAY!
+      if (!isPrimitiveType(val)) {
+        layoutHeapObject(val);
+        //console.log('global:', varname, getRefID(val));
+      }
+    }
+  });
+
+  $.each(stack_to_render, function(i, frame) {
+    if (frame.ordered_varnames.length > 0) {
+      $.each(frame.ordered_varnames, function(xxx, varname) {
+        var val = frame.encoded_locals[varname];
+
+        // ignore return values for zombie frames
+        if (frame.is_zombie && varname == '__return__') {
+          return;
+        }
+
+        if (!isPrimitiveType(val)) {
+          layoutHeapObject(val);
+          //console.log(frame.func_name + ':', varname, getRefID(val));
+        }
+      });
+    }
+  });
+
+
+  // print toplevelHeapLayout
+  /*
+  $.each(toplevelHeapLayout, function(i, elt) {
+    console.log(elt);
+  });
+  console.log('---');
+  */
+
+
+  // Heap object rendering phase:
+
+
+  // Key:   CSS ID of the div element representing the stack frame variable
+  //        (for stack->heap connections) or heap object (for heap->heap connections)
+  //        the format is: 'heap_pointer_src_'
+  // Value: CSS ID of the div element representing the value rendered in the heap
+  //        (the format is: 'heap_object_')
+  var connectionEndpointIDs = {};
+  var heapConnectionEndpointIDs = {}; // subset of connectionEndpointIDs for heap->heap connections
+
+  var heap_pointer_src_id = 1; // increment this to be unique for each heap_pointer_src_*
+
+
+  var renderedObjectIDs = {}; // set (TODO: refactor all sets to use d3.map)
+
+  // count all toplevelHeapLayoutIDs as already rendered since we will render them
+  // in the d3 .each() statement labeled 'FOOBAR' (might be confusing!)
+  $.each(toplevelHeapLayoutIDs, function(k, v) {
+    renderedObjectIDs[k] = v;
+  });
+
+
+  // render the heap by mapping toplevelHeapLayout into  and
+  // ');
+          var headerTr = tbl.find('tr:first');
+          var contentTr = tbl.find('tr:last');
+          $.each(obj, function(ind, val) {
+            if (ind < 1) return; // skip type tag and ID entry
+
+            // add a new column and then pass in that newly-added column
+            // as d3DomElement to the recursive call to child:
+            headerTr.append('');
+            headerTr.find('td:last').append(ind - 1);
+
+            contentTr.append('');
+            renderNestedObject(val, contentTr.find('td:last'));
+          });
+        }
+        else if (obj[0] == 'SET') {
+          // create an R x C matrix:
+          var numElts = obj.length - 1;
+
+          // gives roughly a 3x5 rectangular ratio, square is too, err,
+          // 'square' and boring
+          var numRows = Math.round(Math.sqrt(numElts));
+          if (numRows > 3) {
+            numRows -= 1;
+          }
+
+          var numCols = Math.round(numElts / numRows);
+          // round up if not a perfect multiple:
+          if (numElts % numRows) {
+            numCols += 1;
+          }
+
+          jQuery.each(obj, function(ind, val) {
+            if (ind < 1) return; // skip 'SET' tag
+
+            if (((ind - 1) % numCols) == 0) {
+              tbl.append('');
+            }
+
+            var curTr = tbl.find('tr:last');
+            curTr.append('');
+            renderNestedObject(val, curTr.find('td:last'));
+          });
+        }
+        else if (obj[0] == 'DICT') {
+          $.each(obj, function(ind, kvPair) {
+            if (ind < 1) return; // skip 'DICT' tag
+
+            tbl.append('');
+            var newRow = tbl.find('tr:last');
+            var keyTd = newRow.find('td:first');
+            var valTd = newRow.find('td:last');
+
+            var key = kvPair[0];
+            var val = kvPair[1];
+
+            renderNestedObject(key, keyTd);
+            renderNestedObject(val, valTd);
+          });
+        }
+      }
+    }
+    else if (obj[0] == 'INSTANCE' || obj[0] == 'CLASS') {
+      var isInstance = (obj[0] == 'INSTANCE');
+      var headerLength = isInstance ? 2 : 3;
+
+      assert(obj.length >= headerLength);
+
+      if (isInstance) {
+        d3DomElement.append('
' + obj[1] + ' instance
');
+      }
+      else {
+        var superclassStr = '';
+        if (obj[2].length > 0) {
+          superclassStr += ('[extends ' + obj[2].join(', ') + '] ');
+        }
+        d3DomElement.append('
' + obj[1] + ' class ' + superclassStr + '
');
+      }
+
+      if (obj.length > headerLength) {
+        var lab = isInstance ? 'inst' : 'class';
+        d3DomElement.append('
 elements using d3.
+  //
+  // TODO: look into doing smooth transitions!
+
+  var heapRows = d3.select(vizDiv + ' #heap')
+    .selectAll('table.heapRow')
+    .data(toplevelHeapLayout,
+          function(objLst) {
+            /* convert list into string to create a unique key for object constancy */
+            return String(objLst);
+    })
+
+
+  // update existing heap row
+  heapRows.each(function(objLst, i) { console.log('UPDATE ROW:', objLst, i); })
+    .selectAll('td')
+    .data(function(d, i) {return d;}, /* map over each row */
+          function(objID) {return String(objID);} /* each object ID is unique for constancy */)
+    .each(function(objID, i) {
+      console.log('UPDATE ELT', objID);
+      // TODO: how do we sensibly render an UPDATE to an element?
+    })
+    .enter().append('td')
+    .attr('class', 'toplevelHeapObject')
+    .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;})
+    .each(function(objID, i) {
+      console.log('NEW ELT', objID);
+      renderCompoundObject(objID, $(this), true); // label FOOBAR (see renderedObjectIDs)
+    })
+
+    //.exit()
+    //.each(function(objID, i) {console.log('DEL ELT:', objID, i);})
+    //.remove()
+
+
+
+  // insert new heap rows
+  heapRows.enter().append('table')
+    .each(function(objLst, i) {console.log('NEW ROW:', objLst, i);})
+    .attr('class', 'heapRow')
+    .selectAll('td')
+    .data(function(d, i) {return d;}, /* map over each row and REMOVE HEADER LIST TAG (TODO) */
+          function(objID) {return String(objID);} /* each object ID is unique for constancy */)
+    .each(function(objID, i) {
+      console.log('UPDATE ELT', objID);
+      // TODO: how do we sensibly render an UPDATE to an element?
+    })
+    .enter().append('td')
+    .attr('class', 'toplevelHeapObject')
+    .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;})
+    .each(function(objID, i) {
+      console.log('NEW ELT', objID);
+      renderCompoundObject(objID, $(this), true); // label FOOBAR (see renderedObjectIDs)
+    });
+
+  // remove deleted rows
+  heapRows.exit()
+    .each(function(objLst, i) {console.log('DEL ROW:', objLst, i);})
+    .remove();
+ 
+
+  function renderNestedObject(obj, d3DomElement) {
+    if (isPrimitiveType(obj)) {
+      renderPrimitiveObject(obj, d3DomElement);
+    }
+    else {
+      renderCompoundObject(getRefID(obj), d3DomElement, false);
+    }
+  }
+
+
+  function renderPrimitiveObject(obj, d3DomElement) {
+    var typ = typeof obj;
+
+    if (obj == null) {
+      d3DomElement.append('None');
+    }
+    else if (typ == "number") {
+      d3DomElement.append('' + obj + '');
+    }
+    else if (typ == "boolean") {
+      if (obj) {
+        d3DomElement.append('True');
+      }
+      else {
+        d3DomElement.append('False');
+      }
+    }
+    else if (typ == "string") {
+      // escape using htmlspecialchars to prevent HTML/script injection
+      var literalStr = htmlspecialchars(obj);
+
+      // print as a double-quoted string literal
+      literalStr = literalStr.replace(new RegExp('\"', 'g'), '\\"'); // replace ALL
+      literalStr = '"' + literalStr + '"';
+
+      d3DomElement.append('' + literalStr + '');
+    }
+    else {
+      assert(false);
+    }
+  }
+
+
+  function renderCompoundObject(objID, d3DomElement, isTopLevel) {
+    if (!isTopLevel && (renderedObjectIDs[objID] != undefined)) {
+      // TODO: render jsPlumb arrow source since this heap object has already been rendered
+
+      // add a stub so that we can connect it with a connector later.
+      // IE needs this div to be NON-EMPTY in order to properly
+      // render jsPlumb endpoints, so that's why we add an " "!
+
+      var srcDivID = 'heap_pointer_src_' + heap_pointer_src_id;
+      heap_pointer_src_id++; // just make sure each source has a UNIQUE ID
+      d3DomElement.append('
 
');
+
+      assert(connectionEndpointIDs[srcDivID] === undefined);
+      connectionEndpointIDs[srcDivID] = 'heap_object_' + objID;
+
+      assert(heapConnectionEndpointIDs[srcDivID] === undefined);
+      heapConnectionEndpointIDs[srcDivID] = 'heap_object_' + objID;
+
+      return; // early return!
+    }
+
+
+    // wrap ALL compound objects in a heapObject div so that jsPlumb
+    // connectors can point to it:
+    d3DomElement.append('
');
+    d3DomElement = $('#heap_object_' + objID);
+
+
+    renderedObjectIDs[objID] = 1;
+
+    var obj = curEntry.heap[objID];
+    assert($.isArray(obj));
+
+
+    if (obj[0] == 'LIST' || obj[0] == 'TUPLE' || obj[0] == 'SET' || obj[0] == 'DICT') {
+      var label = obj[0].toLowerCase();
+
+      assert(obj.length >= 1);
+      if (obj.length == 1) {
+        d3DomElement.append('
empty ' + label + '
');
+      }
+      else {
+        d3DomElement.append('
' + label + '
');
+        d3DomElement.append('
');
+        var tbl = d3DomElement.children('table');
+
+        if (obj[0] == 'LIST' || obj[0] == 'TUPLE') {
+          tbl.append('
');
+
+        var tbl = d3DomElement.children('table');
+
+        $.each(obj, function(ind, kvPair) {
+          if (ind < headerLength) return; // skip header tags
+
+          tbl.append('');
+
+          var newRow = tbl.find('tr:last');
+          var keyTd = newRow.find('td:first');
+          var valTd = newRow.find('td:last');
+
+          // the keys should always be strings, so render them directly (and without quotes):
+          assert(typeof kvPair[0] == "string");
+          var attrnameStr = htmlspecialchars(kvPair[0]);
+          keyTd.append('' + attrnameStr + '');
+
+          // values can be arbitrary objects, so recurse:
+          renderNestedObject(kvPair[1], valTd);
+        });
+      }
+    }
+    else if (obj[0] == 'FUNCTION') {
+      assert(obj.length == 3);
+
+      var funcName = htmlspecialchars(obj[1]); // for displaying weird names like ''
+      var parentFrameID = obj[2]; // optional
+
+      if (parentFrameID) {
+        d3DomElement.append('
function ' + funcName + ' [parent=f'+ parentFrameID + ']
');
+      }
+      else {
+        d3DomElement.append('
function ' + funcName + '
');
+      }
+    }
+    else {
+      // render custom data type
+      assert(obj.length == 2);
+
+      var typeName = obj[0];
+      var strRepr = obj[1];
+
+      strRepr = htmlspecialchars(strRepr); // escape strings!
+
+      d3DomElement.append('
' + typeName + '
');
+      d3DomElement.append('
' + strRepr + '
');
+    }
+  }
+
+
+  // Render globals and then stack frames:
+  // TODO: could convert to using d3 to map globals and stack frames directly into stack frame divs
+  // (which might make it easier to do smooth transitions)
+
+  // render all global variables IN THE ORDER they were created by the program,
+  // in order to ensure continuity:
+  if (curEntry.ordered_globals.length > 0) {
+    $(vizDiv + " #stack").append('
Global variables
');
+    $(vizDiv + " #stack #globals").append('
');
+
+    var tbl = $(vizDiv + " #global_table");
+
+    $.each(curEntry.ordered_globals, function(i, varname) {
+      var val = curEntry.globals[varname];
+      // (use '!==' to do an EXACT match against undefined)
+      if (val !== undefined) { // might not be defined at this line, which is OKAY!
+        tbl.append('' + varname + '');
+        var curTr = tbl.find('tr:last');
+
+        if (isPrimitiveType(val)) {
+          renderPrimitiveObject(val, curTr.find("td.stackFrameValue"));
+        }
+        else{
+          // add a stub so that we can connect it with a connector later.
+          // IE needs this div to be NON-EMPTY in order to properly
+          // render jsPlumb endpoints, so that's why we add an " "!
+
+          // make sure varname doesn't contain any weird
+          // characters that are illegal for CSS ID's ...
+          var varDivID = 'global__' + varnameToCssID(varname);
+          curTr.find("td.stackFrameValue").append('
 
');
+
+          assert(connectionEndpointIDs[varDivID] === undefined);
+          var heapObjID = 'heap_object_' + getRefID(val);
+          connectionEndpointIDs[varDivID] = heapObjID;
+        }
+      }
+    });
+  }
+
+
+  $.each(stack_to_render, function(i, e) {
+    renderStackFrame(e, i, e.is_zombie);
+  });
+
+
+  function renderStackFrame(frame, ind, is_zombie) {
+    var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
+    var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
+
+    // optional (btw, this isn't a CSS id)
+    var parentFrameID = null;
+    if (frame.parent_frame_id_list.length > 0) {
+      parentFrameID = frame.parent_frame_id_list[0];
+    }
+
+    var localVars = frame.encoded_locals
+
+    // the stackFrame div's id is simply its index ("stack")
+
+    var divClass, divID, headerDivID;
+    if (is_zombie) {
+      divClass = 'zombieStackFrame';
+      divID = "zombie_stack" + ind;
+      headerDivID = "zombie_stack_header" + ind;
+    }
+    else {
+      divClass = 'stackFrame';
+      divID = "stack" + ind;
+      headerDivID = "stack_header" + ind;
+    }
+
+    $(vizDiv + " #stack").append('
');
+
+    var headerLabel = funcName + '()';
+    if (frameID) {
+      headerLabel = 'f' + frameID + ': ' + headerLabel;
+    }
+    if (parentFrameID) {
+      headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
+    }
+    $(vizDiv + " #stack #" + divID).append('
' + headerLabel + '
');
+
+    if (frame.ordered_varnames.length > 0) {
+      var tableID = divID + '_table';
+      $(vizDiv + " #stack #" + divID).append('
');
+
+      var tbl = $(vizDiv + " #" + tableID);
+
+      $.each(frame.ordered_varnames, function(xxx, varname) {
+        var val = localVars[varname];
+
+        // don't render return values for zombie frames
+        if (is_zombie && varname == '__return__') {
+          return;
+        }
+
+        // special treatment for displaying return value and indicating
+        // that the function is about to return to its caller
+        //
+        // DON'T do this for zombie frames
+        if (varname == '__return__' && !is_zombie) {
+          assert(curEntry.event == 'return'); // sanity check
+
+          tbl.append('About to return');
+          tbl.append('Return value:');
+        }
+        else {
+          tbl.append('' + varname + '');
+        }
+
+        var curTr = tbl.find('tr:last');
+
+        if (isPrimitiveType(val)) {
+          renderPrimitiveObject(val, curTr.find("td.stackFrameValue"));
+        }
+        else {
+          // add a stub so that we can connect it with a connector later.
+          // IE needs this div to be NON-EMPTY in order to properly
+          // render jsPlumb endpoints, so that's why we add an " "!
+
+          // make sure varname doesn't contain any weird
+          // characters that are illegal for CSS ID's ...
+          var varDivID = divID + '__' + varnameToCssID(varname);
+          curTr.find("td.stackFrameValue").append('
 
');
+
+          assert(connectionEndpointIDs[varDivID] === undefined);
+          var heapObjID = 'heap_object_' + getObjectID(val);
+          connectionEndpointIDs[varDivID] = heapObjID;
+        }
+      });
+    }
+  }
+
+
+  // finally add all the connectors!
+  for (varID in connectionEndpointIDs) {
+    var valueID = connectionEndpointIDs[varID];
+    jsPlumb.connect({source: varID, target: valueID});
+  }
+
+
+  function highlight_frame(frameID) {
+    var allConnections = jsPlumb.getConnections();
+    for (var i = 0; i < allConnections.length; i++) {
+      var c = allConnections[i];
+
+      // this is VERY VERY fragile code, since it assumes that going up
+      // five layers of parent() calls will get you from the source end
+      // of the connector to the enclosing stack frame
+      var stackFrameDiv = c.source.parent().parent().parent().parent().parent();
+
+      // if this connector starts in the selected stack frame ...
+      if (stackFrameDiv.attr('id') == frameID) {
+        // then HIGHLIGHT IT!
+        c.setPaintStyle({lineWidth:1, strokeStyle: darkBlue});
+        c.endpoints[0].setPaintStyle({fillStyle: darkBlue});
+        c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
+
+        // ... and move it to the VERY FRONT
+        $(c.canvas).css("z-index", 1000);
+      }
+      // for heap->heap connectors
+      else if (heapConnectionEndpointIDs[c.endpoints[0].elementId] !== undefined) {
+        // then HIGHLIGHT IT!
+        c.setPaintStyle({lineWidth:1, strokeStyle: darkBlue}); // make thinner
+        c.endpoints[0].setPaintStyle({fillStyle: darkBlue});
+        c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
+        //c.setConnector([ "Bezier", {curviness: 80} ]); // make it more curvy
+        c.setConnector([ "StateMachine" ]);
+        c.addOverlay([ "Arrow", { length: 10, width:7, foldback:0.55, location:1 }]);
+      }
+      else {
+        // else unhighlight it
+        c.setPaintStyle({lineWidth:1, strokeStyle: lightGray});
+        c.endpoints[0].setPaintStyle({fillStyle: lightGray});
+        c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
+        $(c.canvas).css("z-index", 0);
+      }
+    }
+
+    // clear everything, then just activate $(this) one ...
+    $(".stackFrame").removeClass("highlightedStackFrame");
+    $('#' + frameID).addClass("highlightedStackFrame");
+  }
+
+
+  // highlight the top-most non-zombie stack frame or, if not available, globals
+  var frame_already_highlighted = false;
+  $.each(stack_to_render, function(i, e) {
+    if (e.is_highlighted) {
+      highlight_frame('stack' + i);
+      frame_already_highlighted = true;
+    }
+  });
+
+  if (!frame_already_highlighted) {
+    highlight_frame('globals');
+  }
+
+}
+
+
+function isPrimitiveType(obj) {
+  var typ = typeof obj;
+  return ((obj == null) || (typ != "object"));
+}
+
+function getRefID(obj) {
+  assert(obj[0] == 'REF');
+  return obj[1];
+}
+
+/*
+function renderInline(obj) {
+  return isPrimitiveType(obj) && (typeof obj != 'string');
+}
+*/
+
+// Key is a primitive value (e.g., 'hello', 3.14159, true)
+// Value is a unique primitive ID (starting with 'p' to disambiguate
+// from regular object IDs)
+var primitive_IDs = {null: 'p0', true: 'p1', false: 'p2'};
+var cur_pID = 3;
+
+function getObjectID(obj) {
+  if (isPrimitiveType(obj)) {
+    // primitive objects get IDs starting with 'p' ...
+    // this renders aliases as 'interned' for simplicity
+    var pID = primitive_IDs[obj];
+    if (pID !== undefined) {
+      return pID;
+    }
+    else {
+      var new_pID = 'p' + cur_pID;
+      primitive_IDs[obj] = new_pID;
+      cur_pID++;
+      return new_pID;
+    }
+    return obj;
+  }
+  else {
+    assert($.isArray(obj));
+
+    if ((obj[0] == 'INSTANCE') || (obj[0] == 'CLASS')) {
+      return obj[2];
+    }
+    else {
+      return obj[1];
+    }
+  }
+}
+
+
+
+String.prototype.rtrim = function() {
+  return this.replace(/\s*$/g, "");
+}
+
+
+function renderPyCodeOutput(codeStr) {
+  clearSliderBreakpoints(); // start fresh!
+
+  var lines = codeStr.rtrim().split('\n');
+
+  // reset it!
+  codeOutputLines = [];
+  $.each(lines, function(i, cod) {
+    var n = {};
+    n.text = cod;
+    n.lineNumber = i + 1;
+    n.executionPoints = [];
+    n.backgroundColor = null;
+    n.breakpointHere = false;
+
+
+    $.each(curTrace, function(i, elt) {
+      if (elt.line == n.lineNumber) {
+        n.executionPoints.push(i);
+      }
+    });
+
+
+    // if there is a comment containing 'breakpoint' and this line was actually executed,
+    // then set a breakpoint on this line
+    var breakpointInComment = false;
+    toks = cod.split('#');
+    for (var j = 1 /* start at index 1, not 0 */; j < toks.length; j++) {
+      if (toks[j].indexOf('breakpoint') != -1) {
+        breakpointInComment = true;
+      }
+    }
+
+    if (breakpointInComment && n.executionPoints.length > 0) {
+      n.breakpointHere = true;
+      addToBreakpoints(n.executionPoints);
+    }
+
+    codeOutputLines.push(n);
+  });
+
+
+  $("#pyCodeOutputDiv").empty(); // jQuery empty() is better than .html('')
+
+
+  // maps codeOutputLines to both table columns
+  d3.select('#pyCodeOutputDiv')
+    .append('table')
+    .attr('id', 'pyCodeOutput')
+    .selectAll('tr')
+    .data(codeOutputLines)
+    .enter().append('tr')
+    .selectAll('td')
+    .data(function(e, i){return [e, e];}) // bind an alias of the element to both table columns
+    .enter().append('td')
+    .attr('class', function(d, i) {return (i == 0) ? 'lineNo' : 'cod';})
+    .style('cursor', function(d, i) {return 'pointer'})
+    .html(function(d, i) {
+      if (i == 0) {
+        return d.lineNumber;
+      }
+      else {
+        return htmlspecialchars(d.text);
+      }
+     })
+    .on('mouseover', function() {
+      setHoverBreakpoint(this);
+     })
+    .on('mouseout', function() {
+      hoverBreakpoints = {};
+
+      var breakpointHere = d3.select(this).datum().breakpointHere;
+
+      if (!breakpointHere) {
+        unsetBreakpoint(this);
+      }
+
+      renderSliderBreakpoints(); // get rid of hover breakpoint colors
+     })
+    .on('mousedown', function() {
+      // don't do anything if exePts is empty
+      // (i.e., this line was never executed)
+      var exePts = d3.select(this).datum().executionPoints;
+      if (!exePts || exePts.length == 0) {
+        return;
+      }
+
+      // toggle breakpoint
+      d3.select(this).datum().breakpointHere = !d3.select(this).datum().breakpointHere;
+
+      var breakpointHere = d3.select(this).datum().breakpointHere;
+      if (breakpointHere) {
+        setBreakpoint(this);
+      }
+      else {
+        unsetBreakpoint(this);
+      }
+     });
+
+  renderSliderBreakpoints(); // renders breakpoints written in as code comments
+}
+
+
+
+var breakpoints = {}; // set of execution points to set as breakpoints
+var sortedBreakpointsList = []; // sorted and synced with breakpointLines
+var hoverBreakpoints = {}; // set of breakpoints because we're HOVERING over a given line
+
+
+function _getSortedBreakpointsList() {
+  var ret = [];
+  for (var k in breakpoints) {
+    ret.push(Number(k)); // these should be NUMBERS, not strings
+  }
+  ret.sort(function(x,y){return x-y}); // WTF, javascript sort is lexicographic by default!
+  return ret;
+}
+
+function addToBreakpoints(executionPoints) {
+  $.each(executionPoints, function(i, e) {
+    breakpoints[e] = 1;
+  });
+
+  sortedBreakpointsList = _getSortedBreakpointsList();
+}
+
+function removeFromBreakpoints(executionPoints) {
+  $.each(executionPoints, function(i, e) {
+    delete breakpoints[e];
+  });
+
+  sortedBreakpointsList = _getSortedBreakpointsList();
+}
+
+// find the previous/next breakpoint to c or return -1 if it doesn't exist
+function findPrevBreakpoint(c) {
+  if (sortedBreakpointsList.length == 0) {
+    return -1;
+  }
+  else {
+    for (var i = 1; i < sortedBreakpointsList.length; i++) {
+      var prev = sortedBreakpointsList[i-1];
+      var cur = sortedBreakpointsList[i];
+
+      if (c <= prev) {
+        return -1;
+      }
+
+      if (cur >= c) {
+        return prev;
+      }
+    }
+
+    // final edge case:
+    var lastElt = sortedBreakpointsList[sortedBreakpointsList.length - 1];
+    return (lastElt < c) ? lastElt : -1;
+  }
+}
+
+function findNextBreakpoint(c) {
+  if (sortedBreakpointsList.length == 0) {
+    return -1;
+  }
+  else {
+    for (var i = 0; i < sortedBreakpointsList.length - 1; i++) {
+      var cur = sortedBreakpointsList[i];
+      var next = sortedBreakpointsList[i+1];
+
+      if (c < cur) {
+        return cur;
+      }
+
+      if (cur <= c && c < next) { // subtle
+        return next;
+      }
+    }
+
+    // final edge case:
+    var lastElt = sortedBreakpointsList[sortedBreakpointsList.length - 1];
+    return (lastElt > c) ? lastElt : -1;
+  }
+}
+
+
+function setHoverBreakpoint(t) {
+  var exePts = d3.select(t).datum().executionPoints;
+
+  // don't do anything if exePts is empty
+  // (i.e., this line was never executed)
+  if (!exePts || exePts.length == 0) {
+    return;
+  }
+
+  hoverBreakpoints = {};
+  $.each(exePts, function(i, e) {
+    hoverBreakpoints[e] = 1;
+  });
+
+  addToBreakpoints(exePts);
+  renderSliderBreakpoints();
+}
+
+
+function setBreakpoint(t) {
+  var exePts = d3.select(t).datum().executionPoints;
+
+  // don't do anything if exePts is empty
+  // (i.e., this line was never executed)
+  if (!exePts || exePts.length == 0) {
+    return;
+  }
+
+  addToBreakpoints(exePts);
+
+  d3.select(t.parentNode).select('td.lineNo').style('color', breakpointColor);
+  d3.select(t.parentNode).select('td.lineNo').style('font-weight', 'bold');
+
+  renderSliderBreakpoints();
+}
+
+function unsetBreakpoint(t) {
+  var exePts = d3.select(t).datum().executionPoints;
+
+  // don't do anything if exePts is empty
+  // (i.e., this line was never executed)
+  if (!exePts || exePts.length == 0) {
+    return;
+  }
+
+  removeFromBreakpoints(exePts);
+
+
+  var lineNo = d3.select(t).datum().lineNumber;
+
+  if (visitedLinesSet[lineNo]) {
+    d3.select(t.parentNode).select('td.lineNo').style('color', visitedLineColor);
+    d3.select(t.parentNode).select('td.lineNo').style('font-weight', 'bold');
+  }
+  else {
+    d3.select(t.parentNode).select('td.lineNo').style('color', '');
+    d3.select(t.parentNode).select('td.lineNo').style('font-weight', '');
+  }
+
+  renderSliderBreakpoints();
+}
+
+
+// depends on sortedBreakpointsList global
+function renderSliderBreakpoints() {
+  $("#executionSliderFooter").empty(); // jQuery empty() is better than .html('')
+
+  // I originally didn't want to delete and re-create this overlay every time,
+  // but if I don't do so, there are weird flickering artifacts with clearing
+  // the SVG container; so it's best to just delete and re-create the container each time
+  var sliderOverlay = d3.select('#executionSliderFooter')
+    .append('svg')
+    .attr('id', 'sliderOverlay')
+    .attr('width', $('#executionSlider').width())
+    .attr('height', 12);
+
+  var xrange = d3.scale.linear()
+    .domain([0, curTrace.length - 1])
+    .range([0, $('#executionSlider').width()]);
+
+  sliderOverlay.selectAll('rect')
+      .data(sortedBreakpointsList)
+    .enter().append('rect')
+      .attr('x', function(d, i) {
+        // make the edge cases look decent
+        if (d == 0) {
+          return 0;
+        }
+        else {
+          return xrange(d) - 3;
+        }
+      })
+      .attr('y', 0)
+      .attr('width', 2)
+      .attr('height', 12)
+      .style('fill', function(d) {
+         if (hoverBreakpoints[d] === undefined) {
+           return breakpointColor;
+         }
+         else {
+           return hoverBreakpointColor;
+         }
+       });
+}
+
+
+function clearSliderBreakpoints() {
+  breakpoints = {};
+  sortedBreakpointsList = [];
+  hoverBreakpoints = {};
+  renderSliderBreakpoints();
+}
+
+
+
+// initialization function that should be called when the page is loaded
+function eduPythonCommonInit() {
+
+  $("#jmpFirstInstr").click(function() {
+    curInstr = 0;
+    updateOutput();
+  });
+
+  $("#jmpLastInstr").click(function() {
+    curInstr = curTrace.length - 1;
+    updateOutput();
+  });
+
+  $("#jmpStepBack").click(function() {
+    if (curInstr > 0) {
+      curInstr -= 1;
+      updateOutput();
+    }
+  });
+
+  $("#jmpStepFwd").click(function() {
+    if (curInstr < curTrace.length - 1) {
+      curInstr += 1;
+      updateOutput();
+    }
+  });
+
+  // disable controls initially ...
+  $("#vcrControls #jmpFirstInstr").attr("disabled", true);
+  $("#vcrControls #jmpStepBack").attr("disabled", true);
+  $("#vcrControls #jmpStepFwd").attr("disabled", true);
+  $("#vcrControls #jmpLastInstr").attr("disabled", true);
+
+
+
+  // set some sensible jsPlumb defaults
+  jsPlumb.Defaults.Endpoint = ["Dot", {radius:3}];
+  //jsPlumb.Defaults.Endpoint = ["Rectangle", {width:3, height:3}];
+  jsPlumb.Defaults.EndpointStyle = {fillStyle: lightGray};
+
+  jsPlumb.Defaults.Anchors = ["RightMiddle", "LeftMiddle"]; // for aesthetics!
+
+  jsPlumb.Defaults.PaintStyle = {lineWidth:1, strokeStyle: lightGray};
+
+  // bezier curve style:
+  //jsPlumb.Defaults.Connector = [ "Bezier", { curviness:15 }]; /* too much 'curviness' causes lines to run together */
+  //jsPlumb.Defaults.Overlays = [[ "Arrow", { length: 14, width:10, foldback:0.55, location:0.35 }]]
+
+  // state machine curve style:
+  jsPlumb.Defaults.Connector = [ "StateMachine" ];
+  jsPlumb.Defaults.Overlays = [[ "Arrow", { length: 10, width:7, foldback:0.55, location:1 }]];
+
+
+  jsPlumb.Defaults.EndpointHoverStyle = {fillStyle: pinkish};
+  jsPlumb.Defaults.HoverPaintStyle = {lineWidth:2, strokeStyle: pinkish};
+
+
+  // set keyboard event listeners ...
+  $(document).keydown(function(k) {
+    // ONLY capture keys if we're in 'visualize code' mode:
+    if (appMode == 'visualize' && !keyStuckDown) {
+      if (k.keyCode == 37) { // left arrow
+        if (curInstr > 0) {
+          // if there is a prev breakpoint, then jump to it ...
+          if (sortedBreakpointsList.length > 0) {
+            var prevBreakpoint = findPrevBreakpoint(curInstr);
+            if (prevBreakpoint != -1) {
+              curInstr = prevBreakpoint;
+            }
+            else {
+              curInstr -= 1; // prevent keyboard keys from "getting stuck" on a solitary breakpoint
+            }
+          }
+          else {
+            curInstr -= 1;
+          }
+          updateOutput();
+        }
+
+        k.preventDefault(); // don't horizontally scroll the display
+
+        keyStuckDown = true;
+      }
+      else if (k.keyCode == 39) { // right arrow
+        if (curInstr < curTrace.length - 1) {
+          // if there is a next breakpoint, then jump to it ...
+          if (sortedBreakpointsList.length > 0) {
+            var nextBreakpoint = findNextBreakpoint(curInstr);
+            if (nextBreakpoint != -1) {
+              curInstr = nextBreakpoint;
+            }
+            else {
+              curInstr += 1; // prevent keyboard keys from "getting stuck" on a solitary breakpoint
+            }
+          }
+          else {
+            curInstr += 1;
+          }
+          updateOutput();
+        }
+
+        k.preventDefault(); // don't horizontally scroll the display
+
+        keyStuckDown = true;
+      }
+    }
+  });
+
+  $(document).keyup(function(k) {
+    keyStuckDown = false;
+  });
+
+
+  // redraw everything on window resize so that connectors are in the
+  // right place
+  // TODO: can be SLOW on older browsers!!!
+  $(window).resize(function() {
+    if (appMode == 'visualize') {
+      updateOutput();
+    }
+  });
+
+  $("#classicModeCheckbox").click(function() {
+    if (appMode == 'visualize') {
+      updateOutput();
+    }
+  });
+
+
+  // log a generic AJAX error handler
+  $(document).ajaxError(function() {
+    alert("Server error (possibly due to memory/resource overload).");
+
+    $('#executeBtn').html("Visualize execution");
+    $('#executeBtn').attr('disabled', false);
+  });
+
+}
+
diff --git a/PyTutorGAE/js/tmp-mess-with-d3/tutor.html b/PyTutorGAE/js/tmp-mess-with-d3/tutor.html
new file mode 100644
index 000000000..94c76d900
--- /dev/null
+++ b/PyTutorGAE/js/tmp-mess-with-d3/tutor.html
@@ -0,0 +1,255 @@
+
+
+
+
+
+
+  Online Python Tutor (v3)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

+
+Write your Python code here:
+

+
+
 
+
+

+
+
+
+

+
+
Try these small examples:

+
+aliasing |
+intro |
+factorial |
+fibonacci |
+memoized fib |
+square root |
+insertion sort
+

+filter |
+tokenize |
+OOP |
+gcd |
+sumList |
+towers of hanoi |
+exceptions
+
+

+
+
From MIT's 6.01 course:

+
+list map |
+summation |
+OOP 1 |
+OOP 2 |
+inheritance
+
+

+
+
Nested functions:
+

+
+closure 1 |
+closure 2 |
+closure 3 |
+closure 4 |
+closure 5
+
+

+
+
Aliasing:
+

+
+aliasing 1 |
+aliasing 2 |
+aliasing 3 |
+aliasing 4 |
+aliasing 5 |
+aliasing 6 |
+aliasing 7
+
+

+
+
Linked lists:
+

+
+LL 1 |
+LL 2
+
+

+
+
+

+
+
+
+
+
+  
+
+
+
+
+
+
+

+    
+  

+
+

+
+

+
+

+
+
+
+

+
+
Use the slider or the left and right arrow keys to step through execution.
+
Click on code to set breakpoints.

+
+

+

+
+

+  
+  
+  Step ? of ?
+  
+  
+

+
+
+

+
+
+

+
+Program output:
+

+
+
+

+ 
+

+
+
+		
+
+

+
+  
+    
+      
+      
+    
+  

+        

+          
Frames

+        

+      		
+        

+          
Objects

+        

+      

+
+

+
+

+
+
 
+
+
+
+
+
+

From 94bb372934a62392a5f72d4e8a128298d0244da6 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 5 Aug 2012 10:08:58 -0700
Subject: [PATCH 026/502] started implementing krazy kode for pre-computing
 stable layouts

---
 PyTutorGAE/js/edu-python.js | 165 ++++++++++++++++++++++++++++++++++++
 1 file changed, 165 insertions(+)

diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 15699281d..d428adcb5 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -254,6 +254,171 @@ function isOutputLineVisible(lineNo) {
 
 
 
+// Pre-compute the layout of top-level heap objects for ALL execution
+// points as soon as a trace is first loaded. The reason why we want to
+// do this is so that when the user steps through execution points, the
+// heap objects don't "jiggle around" (i.e., preserving positional
+// invariance). Also, if we set up the layout objects properly, then we
+// can take full advantage of d3 to perform rendering and transitions.
+
+
+// curTraceLayouts is a list of top-level heap layout "objects" with the
+// same length as curTrace after it's been fully initialized. Each
+// element of curTraceLayouts is computed from the contents of its
+// immediate predecessor, thus ensuring that objects don't "jiggle
+// around" between consecutive execution points.
+//
+// Each top-level heap layout "object" is itself a LIST of LISTS of
+// object IDs, where each element of the outer list represents a row,
+// and each element of the inner list represents columns within a
+// particular row. Each row can have a different number of columns. Most
+// rows have exactly ONE column (representing ONE object ID), but rows
+// containing 1-D linked data structures have multiple columns. Each
+// inner list element looks something like ['row1', 3, 2, 1] where the
+// first element is a unique row ID tag, which is used as a key for d3 to
+// preserve "object constancy" for updates, transitions, etc. The row ID
+// is derived from the FIRST object ID inserted into the row. Since all
+// object IDs are unique, all row IDs will also be unique.
+var curTraceLayouts = null;
+
+/* This is a good, simple example to test whether objects "jiggle"
+
+x = [1, [2, [3, None]]]
+y = [4, [5, [6, None]]]
+
+x[1][1] = y[1]
+
+*/
+
+
+function precomputeCurTraceLayouts() {
+  curTraceLayouts = [];
+  curTraceLayouts.push([]); // pre-seed with an empty sentinel to simplify the code
+
+  assert(curTrace.length > 0);
+
+ 
+  $.each(curTrace, function(i, elt) {
+    var prevLayout = curTraceLayouts[curTraceLayouts.length - 1];
+
+    // make a DEEP COPY of prevLayout to use as the basis for curLine
+    var curLayout = $.extend(true /* deep copy */ , [], prevLayout);
+
+    // initialize with all IDs from curLayout
+    var idsToRemove = d3.map();
+    $.each(curLayout, function(i, row) {
+      for (var j = 1 /* ignore row ID tag */; j < row.length; j++) {
+        idsToRemove.set(row[j], 1);
+      }
+    });
+
+
+    function curLayoutIndexOf(id) {
+      for (var i = 0; i < curLayout.length; i++) {
+        var row = curLayout[i];
+        var index = row.indexOf(id);
+        if (index > 0) { // index of 0 is impossible since it's the row ID tag
+          return {row: row, index: index}
+        }
+      }
+      return null;
+    }
+
+
+    // a krazy function!
+    // id     - the new object ID to be inserted somewhere in curLayout
+    //          (if it's not already in there)
+    // curRow - a row within curLayout where new linked list
+    //          elements can be appended onto (might be null)
+    // newRow - a new row that might be spliced into curRow or appended
+    //          as a new row in curLayout
+    function updateCurLayout(id, curRow, newRow) {
+      var curLayoutLoc = curLayoutIndexOf(id);
+
+      // if id is already in curLayout ...
+      if (curLayoutLoc) {
+        var foundRow = curLayoutLoc.row;
+        var foundIndex = curLayoutLoc.index;
+
+        // splice the contents of newRow right BEFORE foundIndex.
+        // (Think about when you're trying to insert in id=3 into ['row1', 2, 1]
+        //  to represent a linked list 3->2->1. You want to splice the 3
+        //  entry right before the 2 to form ['row1', 3, 2, 1])
+        if (newRow.length > 1) {
+          var args = [foundIndex - 1, 0];
+          for (var i = 1; i < newRow.length; i++) { // ignore row ID tag
+            args.push(newRow[i]);
+            idsToRemove.remove(newRow[i]);
+          }
+          foundRow.splice.apply(args);
+
+          // remove ALL elements from newRow since they've all been accounted for
+          // (but don't reassign it away to an empty list, since the
+          // CALLER checks its value. TODO: get rid of this gross hack?!?)
+          newRow.splice(0, newRow.length);
+        }
+
+        // recurse to find more top-level linked entries to append onto curRow
+        //   updateCurLayout(child ID, foundRow, [])
+
+      }
+      else {
+        // push id into newRow ...
+        if (newRow.length == 0) {
+          newRow.push('row' + id); // unique row ID (since IDs are unique)
+        }
+        newRow.push(id);
+
+        // RECURSE to find possible top-level linked entries
+        //   updateCurLayout(child ID, curRow, newRow)
+
+
+        // if newRow hasn't been spliced into an existing row yet during
+        // a child recursive call ...
+        if (newRow.length > 0) {
+          if (curRow && curRow.length > 0) {
+            // append onto the END of curRow if it exists
+            for (var i = 1; i < newRow.length; i++) { // ignore row ID tag
+              curRow.push(newRow[i]);
+            }
+          }
+          else {
+            // otherwise push to curLayout as a new row
+            curLayout.push(newRow);
+          }
+
+          // regardless, newRow is now accounted for, so clear it
+          for (var i = 1; i < newRow.length; i++) { // ignore row ID tag
+            idsToRemove.remove(newRow[i]);
+          }
+          newRow.splice(0, newRow.length);
+        }
+
+      }
+    }
+
+
+    // iterate through all globals and ordered stack frames
+    //   and then call updateCurLayout(id, null, []);
+
+
+    // iterate through remaining elements of idsToRemove and REMOVE them
+    // from curLayout
+    idsToRemove.forEach(function(id, xxx) {
+      var ind = row.indexOf(id);
+      if (ind > 0) { // remember that index 0 of the row is the row ID tag
+        row.splice(ind, 1);
+      }
+    });
+
+    curTraceLayouts.push(curLayout);
+  });
+
+  curTraceLayouts.splice(0, 1); // remove seeded empty sentinel element
+  assert (curTrace.length == curTraceLayouts.length);
+}
+
+
 // relies on curTrace and curInstr globals
 function updateOutput() {
   if (!curTrace) {

From f64fd7e38290878c2ca3ddd5a80aa3c05d3ed70e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 5 Aug 2012 16:16:26 -0700
Subject: [PATCH 027/502] move stack_to_render computation to BACKEND

---
 PyTutorGAE/backend_test.py  |  9 ++++++
 PyTutorGAE/js/edu-python.js | 57 ++-----------------------------------
 PyTutorGAE/pg_logger.py     | 47 ++++++++++++++++++++++++++++--
 3 files changed, 57 insertions(+), 56 deletions(-)
 create mode 100644 PyTutorGAE/backend_test.py

diff --git a/PyTutorGAE/backend_test.py b/PyTutorGAE/backend_test.py
new file mode 100644
index 000000000..885972ec9
--- /dev/null
+++ b/PyTutorGAE/backend_test.py
@@ -0,0 +1,9 @@
+import pg_logger, pprint
+
+pp = pprint.PrettyPrinter()
+
+def pprint_finalizer(trace):
+  for e in trace:
+    pp.pprint(e)
+
+pg_logger.exec_script_str(open('example-code/closures/closure3.txt').read(), pprint_finalizer)
diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index d428adcb5..5a6c7ed0d 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -626,47 +626,6 @@ function renderDataStructures(curEntry, vizDiv) {
   $(vizDiv + " #stack").append('
Frames
');
 
 
-  // merge zombie_stack_locals and stack_locals into one master
-  // ordered list using some simple rules for aesthetics
-  var stack_to_render = [];
-
-  // first push all regular stack entries backwards
-  if (curEntry.stack_locals) {
-    for (var i = curEntry.stack_locals.length - 1; i >= 0; i--) {
-      var entry = curEntry.stack_locals[i];
-      entry.is_zombie = false;
-      entry.is_highlighted = (i == 0);
-      stack_to_render.push(entry);
-    }
-  }
-
-  // zombie stack consists of exited functions that have returned nested functions
-  // push zombie stack entries at the BEGINNING of stack_to_render,
-  // EXCEPT put zombie entries BEHIND regular entries that are their parents
-  if (curEntry.zombie_stack_locals) {
-
-    for (var i = curEntry.zombie_stack_locals.length - 1; i >= 0; i--) {
-      var entry = curEntry.zombie_stack_locals[i];
-      entry.is_zombie = true;
-      entry.is_highlighted = false; // never highlight zombie entries
-
-      // j should be 0 most of the time, so we're always inserting new
-      // elements to the front of stack_to_render (which is why we are
-      // iterating backwards over zombie_stack_locals).
-      var j = 0;
-      for (j = 0; j < stack_to_render.length; j++) {
-        if ($.inArray(stack_to_render[j].frame_id, entry.parent_frame_id_list) >= 0) {
-          continue;
-        }
-        break;
-      }
-
-      stack_to_render.splice(j, 0, entry);
-    }
-
-  }
-
-
   // first build up a list of lists representing the locations of TOP-LEVEL heap objects to be rendered.
   // doing so decouples the data format of curEntry from the nitty-gritty HTML rendering code,
   // which gives us more flexibility in experimenting with layout strategies.
@@ -813,16 +772,11 @@ function renderDataStructures(curEntry, vizDiv) {
     }
   });
 
-  $.each(stack_to_render, function(i, frame) {
+  $.each(curEntry.stack_to_render, function(i, frame) {
     if (frame.ordered_varnames.length > 0) {
       $.each(frame.ordered_varnames, function(xxx, varname) {
         var val = frame.encoded_locals[varname];
 
-        // ignore return values for zombie frames
-        if (frame.is_zombie && varname == '__return__') {
-          return;
-        }
-
         if (!isPrimitiveType(val)) {
           layoutHeapObject(val);
           //console.log(frame.func_name + ':', varname, getRefID(val));
@@ -1148,7 +1102,7 @@ function renderDataStructures(curEntry, vizDiv) {
   }
 
 
-  $.each(stack_to_render, function(i, e) {
+  $.each(curEntry.stack_to_render, function(i, e) {
     renderStackFrame(e, i, e.is_zombie);
   });
 
@@ -1199,11 +1153,6 @@ function renderDataStructures(curEntry, vizDiv) {
       $.each(frame.ordered_varnames, function(xxx, varname) {
         var val = localVars[varname];
 
-        // don't render return values for zombie frames
-        if (is_zombie && varname == '__return__') {
-          return;
-        }
-
         // special treatment for displaying return value and indicating
         // that the function is about to return to its caller
         //
@@ -1296,7 +1245,7 @@ function renderDataStructures(curEntry, vizDiv) {
 
   // highlight the top-most non-zombie stack frame or, if not available, globals
   var frame_already_highlighted = false;
-  $.each(stack_to_render, function(i, e) {
+  $.each(curEntry.stack_to_render, function(i, e) {
     if (e.is_highlighted) {
       highlight_frame('stack' + i);
       frame_already_highlighted = true;
diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index c5608218c..f0cf5c67c 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -383,13 +383,56 @@ def create_encoded_stack_entry(cur_frame):
         ordered_globals = [e for e in self.all_globals_in_order if e in encoded_globals]
         assert len(ordered_globals) == len(encoded_globals)
 
+
+        # merge zombie_encoded_stack_locals and encoded_stack_locals
+        # into one master ordered list using some simple rules for
+        # making it look aesthetically pretty
+        stack_to_render = [];
+
+        # first push all regular stack entries BACKWARDS
+        if encoded_stack_locals:
+          stack_to_render = encoded_stack_locals[::-1]
+          for e in stack_to_render:
+            e['is_zombie'] = False
+            e['is_highlighted'] = False
+
+          stack_to_render[-1]['is_highlighted'] = True
+
+
+        # zombie_encoded_stack_locals consists of exited functions that have returned
+        # nested functions. Push zombie stack entries at the BEGINNING of stack_to_render,
+        # EXCEPT put zombie entries BEHIND regular entries that are their parents
+        for e in zombie_encoded_stack_locals[::-1]:
+          # don't display return value for zombie frames
+          try:
+            e['ordered_varnames'].remove('__return__')
+          except ValueError:
+            pass
+
+          e['is_zombie'] = True
+          e['is_highlighted'] = False # never highlight zombie entries
+
+          # j should be 0 most of the time, so we're always inserting new
+          # elements to the front of stack_to_render (which is why we are
+          # iterating backwards over zombie_stack_locals).
+          j = 0
+          while j < len(stack_to_render):
+            if stack_to_render[j]['frame_id'] in e['parent_frame_id_list']:
+              j += 1
+              continue
+            break
+
+          stack_to_render.insert(j, e)
+
+
         trace_entry = dict(line=lineno,
                            event=event_type,
                            func_name=tos[0].f_code.co_name,
                            globals=encoded_globals,
                            ordered_globals=ordered_globals,
-                           stack_locals=encoded_stack_locals,
-                           zombie_stack_locals=zombie_encoded_stack_locals,
+                           #stack_locals=encoded_stack_locals,               # DEPRECATED in favor of stack_to_render
+                           #zombie_stack_locals=zombie_encoded_stack_locals, # DEPRECATED in favor of stack_to_render
+                           stack_to_render=stack_to_render,
                            heap=self.encoder.get_heap(),
                            stdout=get_user_stdout(tos[0]))
 

From ee24c7135dba2c6ecc445b582a79bbea1a880c77 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 5 Aug 2012 18:40:12 -0700
Subject: [PATCH 028/502] added new aliasing example

---
 PyTutorGAE/js/edu-python-tutor.js   | 5 +++++
 PyTutorGAE/tutor.html               | 3 ++-
 example-code/aliasing/aliasing8.txt | 8 ++++++++
 3 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 example-code/aliasing/aliasing8.txt

diff --git a/PyTutorGAE/js/edu-python-tutor.js b/PyTutorGAE/js/edu-python-tutor.js
index 8dcb226fa..b6955788d 100644
--- a/PyTutorGAE/js/edu-python-tutor.js
+++ b/PyTutorGAE/js/edu-python-tutor.js
@@ -317,6 +317,11 @@ $(document).ready(function() {
     $.get("example-code/aliasing/aliasing7.txt", setCodeMirrorVal);
     return false;
   });
+  $('#aliasing8Link').click(function() {
+    $.get("example-code/aliasing/aliasing8.txt", setCodeMirrorVal);
+    return false;
+  });
+
 
   $('#ll1Link').click(function() {
     $.get("example-code/linked-lists/ll1.txt", setCodeMirrorVal);
diff --git a/PyTutorGAE/tutor.html b/PyTutorGAE/tutor.html
index 5265362f8..3da922e43 100644
--- a/PyTutorGAE/tutor.html
+++ b/PyTutorGAE/tutor.html
@@ -128,7 +128,8 @@
 aliasing 4 |
 aliasing 5 |
 aliasing 6 |
-aliasing 7
+aliasing 7 |
+aliasing 8
 
 

 
diff --git a/example-code/aliasing/aliasing8.txt b/example-code/aliasing/aliasing8.txt
new file mode 100644
index 000000000..707d5196f
--- /dev/null
+++ b/example-code/aliasing/aliasing8.txt
@@ -0,0 +1,8 @@
+# test whether heap objects "jiggle" between steps
+x = [1, [2, [3, None]]]
+y = [4, [5, [6, None]]]
+
+x[1][1] = y[1] # hopefully no jiggle!
+
+x = set(['apple', 'banana', 'carrot'])
+

From 95472de6f7264366756c88d8f382b527ec393432 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 5 Aug 2012 21:32:54 -0700
Subject: [PATCH 029/502] bammy

---
 PyTutorGAE/js/edu-python-tutor.js |   2 +
 PyTutorGAE/js/edu-python.js       | 127 ++++++++++++++++++++++++++----
 2 files changed, 113 insertions(+), 16 deletions(-)

diff --git a/PyTutorGAE/js/edu-python-tutor.js b/PyTutorGAE/js/edu-python-tutor.js
index b6955788d..9ffc054b7 100644
--- a/PyTutorGAE/js/edu-python-tutor.js
+++ b/PyTutorGAE/js/edu-python-tutor.js
@@ -39,6 +39,8 @@ function enterVisualizeMode(traceData, inputCode) {
   curTrace = traceData;
   curInputCode = inputCode;
 
+  precomputeCurTraceLayouts(); // bam!
+
   renderPyCodeOutput(inputCode);
 
   $.bbq.pushState({ mode: 'visualize' }, 2 /* completely override other hash strings to keep URL clean */);
diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 5a6c7ed0d..4f6449516 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -298,7 +298,7 @@ function precomputeCurTraceLayouts() {
   assert(curTrace.length > 0);
 
  
-  $.each(curTrace, function(i, elt) {
+  $.each(curTrace, function(i, curEntry) {
     var prevLayout = curTraceLayouts[curTraceLayouts.length - 1];
 
     // make a DEEP COPY of prevLayout to use as the basis for curLine
@@ -325,6 +325,56 @@ function precomputeCurTraceLayouts() {
     }
 
 
+    function recurseIntoObject(id, curRow, newRow) {
+      // heuristic for laying out 1-D linked data structures: check for enclosing elements that are
+      // structurally identical and then lay them out as siblings in the same "row"
+      var heapObj = curEntry.heap[id];
+      assert(heapObj);
+
+      if (heapObj[0] == 'LIST' || heapObj[0] == 'TUPLE') {
+        $.each(heapObj, function(ind, child) {
+          if (ind < 1) return; // skip type tag
+
+          if (!isPrimitiveType(child)) {
+            var childID = getRefID(child);
+            if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
+              updateCurLayout(childID, curRow, newRow);
+            }
+          }
+        });
+      }
+      else if (heapObj[0] == 'DICT') {
+        $.each(heapObj, function(ind, child) {
+          if (ind < 1) return; // skip type tag
+
+          var dictVal = child[1];
+          if (!isPrimitiveType(dictVal)) {
+            var childID = getRefID(dictVal);
+            if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
+              updateCurLayout(childID, curRow, newRow);
+            }
+          }
+        });
+      }
+      else if (heapObj[0] == 'INSTANCE') {
+        jQuery.each(heapObj, function(ind, child) {
+          if (ind < 2) return; // skip type tag and class name
+
+          // instance keys are always strings, so no need to recurse
+          assert(typeof child[0] == "string");
+
+          var instVal = child[1];
+          if (!isPrimitiveType(instVal)) {
+            var childID = getRefID(instVal);
+            if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
+              updateCurLayout(childID, curRow, newRow);
+            }
+          }
+        });
+      }
+    }
+
+
     // a krazy function!
     // id     - the new object ID to be inserted somewhere in curLayout
     //          (if it's not already in there)
@@ -335,11 +385,15 @@ function precomputeCurTraceLayouts() {
     function updateCurLayout(id, curRow, newRow) {
       var curLayoutLoc = curLayoutIndexOf(id);
 
+      console.log('updateCurLayout', id, curRow, newRow, curLayoutLoc);
+
       // if id is already in curLayout ...
       if (curLayoutLoc) {
         var foundRow = curLayoutLoc.row;
         var foundIndex = curLayoutLoc.index;
 
+        idsToRemove.remove(id); // this id is already accounted for!
+
         // splice the contents of newRow right BEFORE foundIndex.
         // (Think about when you're trying to insert in id=3 into ['row1', 2, 1]
         //  to represent a linked list 3->2->1. You want to splice the 3
@@ -358,9 +412,8 @@ function precomputeCurTraceLayouts() {
           newRow.splice(0, newRow.length);
         }
 
-        // recurse to find more top-level linked entries to append onto curRow
-        //   updateCurLayout(child ID, foundRow, [])
-
+        // recurse to find more top-level linked entries to append onto foundRow
+        recurseIntoObject(id, foundRow, []);
       }
       else {
         // push id into newRow ...
@@ -369,8 +422,8 @@ function precomputeCurTraceLayouts() {
         }
         newRow.push(id);
 
-        // RECURSE to find possible top-level linked entries
-        //   updateCurLayout(child ID, curRow, newRow)
+        // recurse to find more top-level linked entries ...
+        recurseIntoObject(id, curRow, newRow);
 
 
         // if newRow hasn't been spliced into an existing row yet during
@@ -384,34 +437,76 @@ function precomputeCurTraceLayouts() {
           }
           else {
             // otherwise push to curLayout as a new row
-            curLayout.push(newRow);
+            //
+            // TODO: this might not always look the best, since we might
+            // sometimes want to splice newRow in the MIDDLE of
+            // curLayout. Consider this example:
+            //
+            // x = [1,2,3]
+            // y = [4,5,6]
+            // x = [7,8,9]
+            //
+            // when the third line is executed, the arrows for x and y
+            // will be crossed (ugly!) since the new row for the [7,8,9]
+            // object is pushed to the end (bottom) of curLayout. The
+            // proper behavior is to push it to the beginning of
+            // curLayout where the old row for 'x' used to be.
+            curLayout.push($.extend(true /* make a deep copy */ , [], newRow));
           }
 
           // regardless, newRow is now accounted for, so clear it
           for (var i = 1; i < newRow.length; i++) { // ignore row ID tag
             idsToRemove.remove(newRow[i]);
           }
-          newRow.splice(0, newRow.length);
+          newRow.splice(0, newRow.length); // kill it!
         }
 
       }
     }
 
+    console.log('BEG precomputeCurTraceLayouts', i);
 
-    // iterate through all globals and ordered stack frames
-    //   and then call updateCurLayout(id, null, []);
 
+    // iterate through all globals and ordered stack frames and call updateCurLayout
+    $.each(curEntry.ordered_globals, function(i, varname) {
+      var val = curEntry.globals[varname];
+      if (val !== undefined) { // might not be defined at this line, which is OKAY!
+        if (!isPrimitiveType(val)) {
+          var id = getRefID(val);
+          updateCurLayout(id, null, []);
+        }
+      }
+    });
+
+    $.each(curEntry.stack_to_render, function(i, frame) {
+      $.each(frame.ordered_varnames, function(xxx, varname) {
+        var val = frame.encoded_locals[varname];
 
-    // iterate through remaining elements of idsToRemove and REMOVE them
-    // from curLayout
+        if (!isPrimitiveType(val)) {
+          var id = getRefID(val);
+          updateCurLayout(id, null, []);
+        }
+      });
+    });
+
+
+    // iterate through remaining elements of idsToRemove and REMOVE them from curLayout
     idsToRemove.forEach(function(id, xxx) {
-      var ind = row.indexOf(id);
-      if (ind > 0) { // remember that index 0 of the row is the row ID tag
-        row.splice(ind, 1);
-      }
+      id = Number(id); // keys are stored as strings, so convert!!!
+      $.each(curLayout, function(rownum, row) {
+        var ind = row.indexOf(id);
+        if (ind > 0) { // remember that index 0 of the row is the row ID tag
+          row.splice(ind, 1);
+        }
+      });
     });
 
+    // now remove empty rows (i.e., those with only a row ID tag) from curLayout
+    curLayout = curLayout.filter(function(row) {return row.length > 1});
+
     curTraceLayouts.push(curLayout);
+    console.log('END precomputeCurTraceLayouts', i);
+    idsToRemove.forEach(function (id, xxx) {console.log('  idsToRemove:', id);});
   });
 
   curTraceLayouts.splice(0, 1); // remove seeded empty sentinel element

From 2133ac8cf984332e819be07b9402cae8f3d52de1 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 5 Aug 2012 22:18:30 -0700
Subject: [PATCH 030/502] some subtle renamings

---
 PyTutorGAE/js/edu-python-tutor.js | 30 +++++++++++++++++++++-----
 PyTutorGAE/js/edu-python.js       | 35 +++++++++++--------------------
 2 files changed, 37 insertions(+), 28 deletions(-)

diff --git a/PyTutorGAE/js/edu-python-tutor.js b/PyTutorGAE/js/edu-python-tutor.js
index 9ffc054b7..c38154af2 100644
--- a/PyTutorGAE/js/edu-python-tutor.js
+++ b/PyTutorGAE/js/edu-python-tutor.js
@@ -34,15 +34,35 @@ function enterEditMode() {
   $.bbq.pushState({ mode: 'edit' }, 2 /* completely override other hash strings to keep URL clean */);
 }
 
-function enterVisualizeMode(traceData, inputCode) {
+function preprocessBackendResult(traceData, inputCode) {
   // set gross globals, then let jQuery BBQ take care of the rest
   curTrace = traceData;
   curInputCode = inputCode;
 
-  precomputeCurTraceLayouts(); // bam!
-
   renderPyCodeOutput(inputCode);
 
+
+  // must postprocess traceData prior to running precomputeCurTraceLayouts() ...
+  var lastEntry = curTrace[curTrace.length - 1];
+
+  // GLOBAL!
+  instrLimitReached = (lastEntry.event == 'instruction_limit_reached');
+
+  if (instrLimitReached) {
+    curTrace.pop() // kill last entry
+    var warningMsg = lastEntry.exception_msg;
+    $("#errorOutput").html(htmlspecialchars(warningMsg));
+    $("#errorOutput").show();
+  }
+  // as imran suggests, for a (non-error) one-liner, SNIP off the
+  // first instruction so that we start after the FIRST instruction
+  // has been executed ...
+  else if (curTrace.length == 2) {
+    curTrace.shift();
+  }
+
+  precomputeCurTraceLayouts(); // bam!
+
   $.bbq.pushState({ mode: 'visualize' }, 2 /* completely override other hash strings to keep URL clean */);
 }
 
@@ -113,7 +133,7 @@ $(document).ready(function() {
 
       // do this AFTER making #pyOutputPane visible, or else
       // jsPlumb connectors won't render properly
-      processTrace(false);
+      enterVisualizeMode(false);
     }
     else {
       assert(false);
@@ -159,7 +179,7 @@ $(document).ready(function() {
               $('#executeBtn').attr('disabled', false);
             }
             else {
-              enterVisualizeMode(traceData, pyInputCodeMirror.getValue());
+              preprocessBackendResult(traceData, pyInputCodeMirror.getValue());
             }
           },
           "json");
diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 4f6449516..9aadeaa9d 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -108,7 +108,7 @@ function htmlspecialchars(str) {
   return str;
 }
 
-function processTrace(jumpToEnd) {
+function enterVisualizeMode(jumpToEnd) {
   curInstr = 0;
 
   // only do this at most ONCE, and then clear out preseededCurInstr
@@ -121,28 +121,9 @@ function processTrace(jumpToEnd) {
   $("#pyStdout").val('');
 
   if (curTrace.length > 0) {
-    var lastEntry = curTrace[curTrace.length - 1];
-
-    // GLOBAL!
-    instrLimitReached = (lastEntry.event == 'instruction_limit_reached');
-
-    if (instrLimitReached) {
-      curTrace.pop() // kill last entry
-      var warningMsg = lastEntry.exception_msg;
-      $("#errorOutput").html(htmlspecialchars(warningMsg));
-      $("#errorOutput").show();
-    }
-    // as imran suggests, for a (non-error) one-liner, SNIP off the
-    // first instruction so that we start after the FIRST instruction
-    // has been executed ...
-    else if (curTrace.length == 2) {
-      curTrace.shift();
-    }
-
-
     if (jumpToEnd) {
       // if there's an exception, then jump to the FIRST occurrence of
-      // that exception.  otherwise, jump to the very end of execution.
+      // that exception. otherwise, jump to the very end of execution.
       curInstr = curTrace.length - 1;
 
       for (var i = 0; i < curTrace.length; i++) {
@@ -165,8 +146,7 @@ function processTrace(jumpToEnd) {
   $('#executionSlider').slider({
     min: 0,
     max: curTrace.length - 1,
-    step: 1
-
+    step: 1,
   });
 
   //disable keyboard actions on the slider itself (to prevent double-firing of events)
@@ -889,6 +869,15 @@ function renderDataStructures(curEntry, vizDiv) {
   console.log('---');
   */
 
+  // VERY VERY experimental!!!
+  // when doing this for realz, convert to using d3 and use row ID tag
+  // as unique object ID for object constancy.
+  var curEntryLayout = curTraceLayouts[curInstr];
+  toplevelHeapLayout = curEntryLayout.map(function(row)
+    {return row.slice(1, row.length); // KRAZY!!! remove row ID tag for now
+  });
+
+
 
   // Heap object rendering phase:
 

From 985f65f89d7d1f783b6e9154778d6d92b24d2b6d Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 5 Aug 2012 22:43:01 -0700
Subject: [PATCH 031/502] prevent infinite loops (and fix some other buggies
 too)

---
 PyTutorGAE/js/edu-python.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 9aadeaa9d..deb50f54c 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -292,6 +292,8 @@ function precomputeCurTraceLayouts() {
       }
     });
 
+    var idsAlreadyLaidOut = d3.map(); // to prevent infinite recursion
+
 
     function curLayoutIndexOf(id) {
       for (var i = 0; i < curLayout.length; i++) {
@@ -363,6 +365,12 @@ function precomputeCurTraceLayouts() {
     // newRow - a new row that might be spliced into curRow or appended
     //          as a new row in curLayout
     function updateCurLayout(id, curRow, newRow) {
+      // if this object has already been laid out, then PUNT!!!
+      if (idsAlreadyLaidOut.has(id)) {
+        return;
+      }
+      idsAlreadyLaidOut.set(id, 1);
+
       var curLayoutLoc = curLayoutIndexOf(id);
 
       console.log('updateCurLayout', id, curRow, newRow, curLayoutLoc);

From 33e79ed8687c600b2aa776653af4251815884c69 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 6 Aug 2012 00:01:06 -0700
Subject: [PATCH 032/502] ugh more subtleties, bah

---
 PyTutorGAE/js/edu-python.js | 48 +++++++++++++++++++++----------------
 1 file changed, 27 insertions(+), 21 deletions(-)

diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index deb50f54c..3db725ebd 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -308,6 +308,10 @@ function precomputeCurTraceLayouts() {
 
 
     function recurseIntoObject(id, curRow, newRow) {
+      if (idsAlreadyLaidOut.has(id)) {
+        return;
+      }
+
       // heuristic for laying out 1-D linked data structures: check for enclosing elements that are
       // structurally identical and then lay them out as siblings in the same "row"
       var heapObj = curEntry.heap[id];
@@ -365,12 +369,6 @@ function precomputeCurTraceLayouts() {
     // newRow - a new row that might be spliced into curRow or appended
     //          as a new row in curLayout
     function updateCurLayout(id, curRow, newRow) {
-      // if this object has already been laid out, then PUNT!!!
-      if (idsAlreadyLaidOut.has(id)) {
-        return;
-      }
-      idsAlreadyLaidOut.set(id, 1);
-
       var curLayoutLoc = curLayoutIndexOf(id);
 
       console.log('updateCurLayout', id, curRow, newRow, curLayoutLoc);
@@ -382,22 +380,27 @@ function precomputeCurTraceLayouts() {
 
         idsToRemove.remove(id); // this id is already accounted for!
 
-        // splice the contents of newRow right BEFORE foundIndex.
-        // (Think about when you're trying to insert in id=3 into ['row1', 2, 1]
-        //  to represent a linked list 3->2->1. You want to splice the 3
-        //  entry right before the 2 to form ['row1', 3, 2, 1])
-        if (newRow.length > 1) {
-          var args = [foundIndex - 1, 0];
-          for (var i = 1; i < newRow.length; i++) { // ignore row ID tag
-            args.push(newRow[i]);
-            idsToRemove.remove(newRow[i]);
-          }
-          foundRow.splice.apply(args);
+        // very subtle ... if id hasn't already been handled in
+        // this iteration, then splice newRow into foundRow. otherwise
+        // (later) append newRow onto curLayout as a truly new row
+        if (!idsAlreadyLaidOut.has(id)) {
+          // splice the contents of newRow right BEFORE foundIndex.
+          // (Think about when you're trying to insert in id=3 into ['row1', 2, 1]
+          //  to represent a linked list 3->2->1. You want to splice the 3
+          //  entry right before the 2 to form ['row1', 3, 2, 1])
+          if (newRow.length > 1) {
+            var args = [foundIndex, 0];
+            for (var i = 1; i < newRow.length; i++) { // ignore row ID tag
+              args.push(newRow[i]);
+              idsToRemove.remove(newRow[i]);
+            }
+            foundRow.splice.apply(foundRow, args);
 
-          // remove ALL elements from newRow since they've all been accounted for
-          // (but don't reassign it away to an empty list, since the
-          // CALLER checks its value. TODO: get rid of this gross hack?!?)
-          newRow.splice(0, newRow.length);
+            // remove ALL elements from newRow since they've all been accounted for
+            // (but don't reassign it away to an empty list, since the
+            // CALLER checks its value. TODO: how to get rid of this gross hack?!?)
+            newRow.splice(0, newRow.length);
+          }
         }
 
         // recurse to find more top-level linked entries to append onto foundRow
@@ -450,6 +453,9 @@ function precomputeCurTraceLayouts() {
         }
 
       }
+
+      // do this at the VERY END!
+      idsAlreadyLaidOut.set(id, 1);
     }
 
     console.log('BEG precomputeCurTraceLayouts', i);

From 06485438f37f5c63fc666aede026227792237de9 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 6 Aug 2012 00:14:29 -0700
Subject: [PATCH 033/502] more subtle changes ... ughhh

---
 PyTutorGAE/js/edu-python.js | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 3db725ebd..536a48c66 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -308,10 +308,6 @@ function precomputeCurTraceLayouts() {
 
 
     function recurseIntoObject(id, curRow, newRow) {
-      if (idsAlreadyLaidOut.has(id)) {
-        return;
-      }
-
       // heuristic for laying out 1-D linked data structures: check for enclosing elements that are
       // structurally identical and then lay them out as siblings in the same "row"
       var heapObj = curEntry.heap[id];
@@ -324,7 +320,9 @@ function precomputeCurTraceLayouts() {
           if (!isPrimitiveType(child)) {
             var childID = getRefID(child);
             if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
-              updateCurLayout(childID, curRow, newRow);
+              if (!idsAlreadyLaidOut.has(childID)) { // TODO: awkward guard location
+                updateCurLayout(childID, curRow, newRow);
+              }
             }
           }
         });
@@ -337,7 +335,9 @@ function precomputeCurTraceLayouts() {
           if (!isPrimitiveType(dictVal)) {
             var childID = getRefID(dictVal);
             if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
-              updateCurLayout(childID, curRow, newRow);
+              if (!idsAlreadyLaidOut.has(childID)) { // TODO: awkward guard location
+                updateCurLayout(childID, curRow, newRow);
+              }
             }
           }
         });
@@ -353,7 +353,9 @@ function precomputeCurTraceLayouts() {
           if (!isPrimitiveType(instVal)) {
             var childID = getRefID(instVal);
             if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
-              updateCurLayout(childID, curRow, newRow);
+              if (!idsAlreadyLaidOut.has(childID)) { // TODO: awkward guard location
+                updateCurLayout(childID, curRow, newRow);
+              }
             }
           }
         });
@@ -373,6 +375,9 @@ function precomputeCurTraceLayouts() {
 
       console.log('updateCurLayout', id, curRow, newRow, curLayoutLoc);
 
+      var alreadyLaidOut = idsAlreadyLaidOut.has(id);
+      idsAlreadyLaidOut.set(id, 1); // unconditionally set now
+
       // if id is already in curLayout ...
       if (curLayoutLoc) {
         var foundRow = curLayoutLoc.row;
@@ -383,7 +388,7 @@ function precomputeCurTraceLayouts() {
         // very subtle ... if id hasn't already been handled in
         // this iteration, then splice newRow into foundRow. otherwise
         // (later) append newRow onto curLayout as a truly new row
-        if (!idsAlreadyLaidOut.has(id)) {
+        if (!alreadyLaidOut) {
           // splice the contents of newRow right BEFORE foundIndex.
           // (Think about when you're trying to insert in id=3 into ['row1', 2, 1]
           //  to represent a linked list 3->2->1. You want to splice the 3
@@ -453,9 +458,6 @@ function precomputeCurTraceLayouts() {
         }
 
       }
-
-      // do this at the VERY END!
-      idsAlreadyLaidOut.set(id, 1);
     }
 
     console.log('BEG precomputeCurTraceLayouts', i);

From 0479387d97bf5bbdd1d1259f96e1ccc0a5a7812e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 6 Aug 2012 14:35:26 -0700
Subject: [PATCH 034/502] more robust error handling

---
 PyTutorGAE/js/edu-python-tutor.js | 33 +++++++++++++++++++------------
 1 file changed, 20 insertions(+), 13 deletions(-)

diff --git a/PyTutorGAE/js/edu-python-tutor.js b/PyTutorGAE/js/edu-python-tutor.js
index c38154af2..43d1cb2a0 100644
--- a/PyTutorGAE/js/edu-python-tutor.js
+++ b/PyTutorGAE/js/edu-python-tutor.js
@@ -159,21 +159,28 @@ $(document).ready(function() {
           function(traceData) {
             // don't enter visualize mode if there are killer errors:
             if (!traceData ||
+                (traceData.length == 0) ||
                 ((traceData.length == 1) && traceData[0].event == 'uncaught_exception')) {
-              var errorLineNo = traceData[0].line - 1; /* CodeMirror lines are zero-indexed */
-              if (errorLineNo !== undefined) {
-                // highlight the faulting line in pyInputCodeMirror
-                pyInputCodeMirror.focus();
-                pyInputCodeMirror.setCursor(errorLineNo, 0);
-                pyInputCodeMirror.setLineClass(errorLineNo, null, 'errorLine');
-
-                pyInputCodeMirror.setOption('onChange', function() {
-                  pyInputCodeMirror.setLineClass(errorLineNo, null, null); // reset line back to normal
-                  pyInputCodeMirror.setOption('onChange', null); // cancel
-                });
-              }
 
-              alert(traceData[0].exception_msg);
+              if (traceData.length > 0) {
+                var errorLineNo = traceData[0].line - 1; /* CodeMirror lines are zero-indexed */
+                if (errorLineNo !== undefined) {
+                  // highlight the faulting line in pyInputCodeMirror
+                  pyInputCodeMirror.focus();
+                  pyInputCodeMirror.setCursor(errorLineNo, 0);
+                  pyInputCodeMirror.setLineClass(errorLineNo, null, 'errorLine');
+
+                  pyInputCodeMirror.setOption('onChange', function() {
+                    pyInputCodeMirror.setLineClass(errorLineNo, null, null); // reset line back to normal
+                    pyInputCodeMirror.setOption('onChange', null); // cancel
+                  });
+                }
+
+                alert(traceData[0].exception_msg);
+              }
+              else {
+                alert("Whoa, unknown error! Please reload and try again.");
+              }
 
               $('#executeBtn').html("Visualize execution");
               $('#executeBtn').attr('disabled', false);

From f0eefe1e6534ec947ea61e56304ee00d02918df0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 6 Aug 2012 14:42:02 -0700
Subject: [PATCH 035/502] continue massive refactoring to use new precomputed
 layout cod

---
 PyTutorGAE/js/edu-python.js | 190 +++---------------------------------
 1 file changed, 14 insertions(+), 176 deletions(-)

diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 536a48c66..ce64fbf43 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -717,185 +717,20 @@ function renderDataStructures(curEntry, vizDiv) {
   $(vizDiv + " #stack").append('
Frames
');
 
 
-  // first build up a list of lists representing the locations of TOP-LEVEL heap objects to be rendered.
-  // doing so decouples the data format of curEntry from the nitty-gritty HTML rendering code,
-  // which gives us more flexibility in experimenting with layout strategies.
-  //
-  // each outer list represents a "row" in the heap layout (represented via, say, div elements)
-  // and each inner list represents "columns" within a row (represented via, say, table td elements)
-  var toplevelHeapLayout = [];
-  var toplevelHeapLayoutIDs = {}; // set of IDs contained within toplevelHeapLayout
-  var alreadyLaidObjectIDs = {};  // set of IDs of objects that have already been laid out
-                                  // (not necessarily just in toplevelHeapLayout since some elements
-                                  //  are EMBEDDED within other heap objects)
-
-
-  function layoutHeapObject(ref) {
-
-    function layoutHeapObjectHelper(id, row /* list of IDs */, isTopLevel) {
-      if (alreadyLaidObjectIDs[id] == undefined) {
-
-        // Only push to row if isTopLevel since it only stores top-level objects ...
-        if (isTopLevel) {
-          row.push(id);
-        }
-
-        // but ALWAYS record that this object has already been laid out, no matter what 
-        alreadyLaidObjectIDs[id] = 1;
-
-        // heuristic for laying out 1-D linked data structures: check for enclosing elements that are
-        // structurally identical and then lay them out as siblings in the same "row"
-        var heapObj = curEntry.heap[id];
-        assert(heapObj);
-
-        if (heapObj[0] == 'LIST' || heapObj[0] == 'TUPLE') {
-          jQuery.each(heapObj, function(ind, child) {
-            if (ind < 1) return; // skip type tag
-
-            if (!isPrimitiveType(child)) {
-              var childID = getRefID(child);
-              if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
-                layoutHeapObjectHelper(childID, row, true);
-              }
-              else {
-                layoutHeapObjectHelper(childID, null, false /* render embedded within heapObj */);
-              }
-            }
-          });
-        }
-        else if (heapObj[0] == 'SET') {
-          jQuery.each(heapObj, function(ind, child) {
-            if (ind < 1) return; // skip type tag
-            if (!isPrimitiveType(child)) {
-              layoutHeapObjectHelper(getRefID(child), null, false /* render embedded within heapObj */);
-            }
-          });
-        }
-        else if (heapObj[0] == 'DICT') {
-          jQuery.each(heapObj, function(ind, child) {
-            if (ind < 1) return; // skip type tag
-
-            var dictKey = child[0];
-            if (!isPrimitiveType(dictKey)) {
-              layoutHeapObjectHelper(getRefID(dictKey), null, false /* render embedded within heapObj */);
-            }
-
-            var dictVal = child[1];
-            if (!isPrimitiveType(dictVal)) {
-              var childID = getRefID(dictVal);
-              if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
-                layoutHeapObjectHelper(childID, row, true);
-              }
-              else {
-                layoutHeapObjectHelper(childID, null, false /* render embedded within heapObj */);
-              }
-            }
-          });
-        }
-        else if (heapObj[0] == 'INSTANCE') {
-          jQuery.each(heapObj, function(ind, child) {
-            if (ind < 2) return; // skip type tag and class name
-
-            // instance keys are always strings, so no need to recurse
-            assert(typeof child[0] == "string");
-
-            var instVal = child[1];
-            if (!isPrimitiveType(instVal)) {
-              var childID = getRefID(instVal);
-              if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
-                layoutHeapObjectHelper(childID, row, true);
-              }
-              else {
-                layoutHeapObjectHelper(childID, null, false /* render embedded within heapObj */);
-              }
-            }
-          });
-        }
-        else if (heapObj[0] == 'CLASS') {
-          jQuery.each(heapObj, function(ind, child) {
-            if (ind < 3) return; // skip type tag, class name, and superclass names
-            // class attr keys are always strings, so no need to recurse
-
-            var classAttrVal = child[1];
-            if (!isPrimitiveType(classAttrVal)) {
-              layoutHeapObjectHelper(getRefID(classAttrVal), null, false /* render embedded within heapObj */);
-            }
-          });
-        }
-      }
-    }
-
-    var id = getRefID(ref);
-    var newRow = [];
-
-    layoutHeapObjectHelper(id, newRow, true);
-    if (newRow.length > 0) {
-      toplevelHeapLayout.push(newRow);
-      $.each(newRow, function(i, e) {
-        toplevelHeapLayoutIDs[e] = 1;
-      });
-    }
-  }
-
-
-
-  // variables are displayed in the following order, so lay out heap objects in the same order:
-  //   - globals
-  //   - stack entries (regular and zombies)
-
-  // if there are multiple aliases to the same object, we want to render
-  // the one "deepest" in the stack, so that we can hopefully prevent
-  // objects from jumping around as functions are called and returned.
-  // e.g., if a list L appears as a global variable and as a local in a
-  // function, we want to render L when rendering the global frame.
-  //
-  // this is straightforward: just go through globals first and then
-  // each stack frame in order :)
-
-  $.each(curEntry.ordered_globals, function(i, varname) {
-    var val = curEntry.globals[varname];
-    // (use '!==' to do an EXACT match against undefined)
-    if (val !== undefined) { // might not be defined at this line, which is OKAY!
-      if (!isPrimitiveType(val)) {
-        layoutHeapObject(val);
-        //console.log('global:', varname, getRefID(val));
-      }
-    }
-  });
-
-  $.each(curEntry.stack_to_render, function(i, frame) {
-    if (frame.ordered_varnames.length > 0) {
-      $.each(frame.ordered_varnames, function(xxx, varname) {
-        var val = frame.encoded_locals[varname];
 
-        if (!isPrimitiveType(val)) {
-          layoutHeapObject(val);
-          //console.log(frame.func_name + ':', varname, getRefID(val));
-        }
-      });
-    }
-  });
+  // Heap object rendering phase:
 
 
-  // print toplevelHeapLayout
-  /*
-  $.each(toplevelHeapLayout, function(i, elt) {
-    console.log(elt);
-  });
-  console.log('---');
-  */
 
   // VERY VERY experimental!!!
   // when doing this for realz, convert to using d3 and use row ID tag
   // as unique object ID for object constancy.
   var curEntryLayout = curTraceLayouts[curInstr];
-  toplevelHeapLayout = curEntryLayout.map(function(row)
-    {return row.slice(1, row.length); // KRAZY!!! remove row ID tag for now
-  });
-
 
+  var toplevelHeapLayout = curEntryLayout.map(function(row) {
+    return row.slice(1, row.length); // KRAZY!!! remove row ID tag for now
+  });
 
-  // Heap object rendering phase:
 
 
   // Key:   CSS ID of the div element representing the stack frame variable
@@ -909,12 +744,14 @@ function renderDataStructures(curEntry, vizDiv) {
   var heap_pointer_src_id = 1; // increment this to be unique for each heap_pointer_src_*
 
 
-  var renderedObjectIDs = {}; // set (TODO: refactor all sets to use d3.map)
+  var renderedObjectIDs = d3.map();
 
-  // count all toplevelHeapLayoutIDs as already rendered since we will render them
+  // count everything in toplevelHeapLayout as already rendered since we will render them
   // in the d3 .each() statement labeled 'FOOBAR' (might be confusing!)
-  $.each(toplevelHeapLayoutIDs, function(k, v) {
-    renderedObjectIDs[k] = v;
+  $.each(toplevelHeapLayout, function(xxx, row) {
+    for (var i = 0; i < row.length; i++) {
+      renderedObjectIDs.set(row[i], 1);
+    }
   });
 
 
@@ -978,8 +815,9 @@ function renderDataStructures(curEntry, vizDiv) {
 
 
   function renderCompoundObject(objID, d3DomElement, isTopLevel) {
-    if (!isTopLevel && (renderedObjectIDs[objID] != undefined)) {
-      // TODO: render jsPlumb arrow source since this heap object has already been rendered
+    if (!isTopLevel && renderedObjectIDs.has(objID)) {
+      // render jsPlumb arrow source since this heap object has already been rendered
+      // (or will be rendered soon)
 
       // add a stub so that we can connect it with a connector later.
       // IE needs this div to be NON-EMPTY in order to properly
@@ -1005,7 +843,7 @@ function renderDataStructures(curEntry, vizDiv) {
     d3DomElement = $('#heap_object_' + objID);
 
 
-    renderedObjectIDs[objID] = 1;
+    renderedObjectIDs.set(objID, 1);
 
     var obj = curEntry.heap[objID];
     assert($.isArray(obj));

From 91118e38f72b96fb1059b84f73a9d26c7b44e975 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 6 Aug 2012 14:51:11 -0700
Subject: [PATCH 036/502] woohoo john's example now works!

---
 example-code/linked-lists/ll1.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/example-code/linked-lists/ll1.txt b/example-code/linked-lists/ll1.txt
index db8b48fc0..223f228be 100644
--- a/example-code/linked-lists/ll1.txt
+++ b/example-code/linked-lists/ll1.txt
@@ -8,3 +8,5 @@ y = None
 for i in range(6, 0, -1):
   y = (i, y)
 
+x[1][0]=y[1][1] # courtesy of John DeNero!
+

From b71fb4e9cb2bb3950478ec74816c3865344a65e9 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 6 Aug 2012 15:47:04 -0700
Subject: [PATCH 037/502] slight code simplification

---
 PyTutorGAE/js/edu-python.js | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index ce64fbf43..9c7fcf892 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -308,6 +308,8 @@ function precomputeCurTraceLayouts() {
 
 
     function recurseIntoObject(id, curRow, newRow) {
+      console.log('recurseIntoObject', id, curRow, newRow);
+
       // heuristic for laying out 1-D linked data structures: check for enclosing elements that are
       // structurally identical and then lay them out as siblings in the same "row"
       var heapObj = curEntry.heap[id];
@@ -320,9 +322,7 @@ function precomputeCurTraceLayouts() {
           if (!isPrimitiveType(child)) {
             var childID = getRefID(child);
             if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
-              if (!idsAlreadyLaidOut.has(childID)) { // TODO: awkward guard location
-                updateCurLayout(childID, curRow, newRow);
-              }
+              updateCurLayout(childID, curRow, newRow);
             }
           }
         });
@@ -335,9 +335,7 @@ function precomputeCurTraceLayouts() {
           if (!isPrimitiveType(dictVal)) {
             var childID = getRefID(dictVal);
             if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
-              if (!idsAlreadyLaidOut.has(childID)) { // TODO: awkward guard location
-                updateCurLayout(childID, curRow, newRow);
-              }
+              updateCurLayout(childID, curRow, newRow);
             }
           }
         });
@@ -353,9 +351,7 @@ function precomputeCurTraceLayouts() {
           if (!isPrimitiveType(instVal)) {
             var childID = getRefID(instVal);
             if (structurallyEquivalent(heapObj, curEntry.heap[childID])) {
-              if (!idsAlreadyLaidOut.has(childID)) { // TODO: awkward guard location
-                updateCurLayout(childID, curRow, newRow);
-              }
+              updateCurLayout(childID, curRow, newRow);
             }
           }
         });
@@ -371,9 +367,11 @@ function precomputeCurTraceLayouts() {
     // newRow - a new row that might be spliced into curRow or appended
     //          as a new row in curLayout
     function updateCurLayout(id, curRow, newRow) {
-      var curLayoutLoc = curLayoutIndexOf(id);
+      if (idsAlreadyLaidOut.has(id)) {
+        return; // PUNT!
+      }
 
-      console.log('updateCurLayout', id, curRow, newRow, curLayoutLoc);
+      var curLayoutLoc = curLayoutIndexOf(id);
 
       var alreadyLaidOut = idsAlreadyLaidOut.has(id);
       idsAlreadyLaidOut.set(id, 1); // unconditionally set now

From 4c28331a4773bad03b8450690ee6759a4c62a0c0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 6 Aug 2012 15:47:41 -0700
Subject: [PATCH 038/502] remove printfs

---
 PyTutorGAE/js/edu-python.js | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 9c7fcf892..418158fc6 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -308,7 +308,6 @@ function precomputeCurTraceLayouts() {
 
 
     function recurseIntoObject(id, curRow, newRow) {
-      console.log('recurseIntoObject', id, curRow, newRow);
 
       // heuristic for laying out 1-D linked data structures: check for enclosing elements that are
       // structurally identical and then lay them out as siblings in the same "row"
@@ -458,8 +457,6 @@ function precomputeCurTraceLayouts() {
       }
     }
 
-    console.log('BEG precomputeCurTraceLayouts', i);
-
 
     // iterate through all globals and ordered stack frames and call updateCurLayout
     $.each(curEntry.ordered_globals, function(i, varname) {
@@ -499,8 +496,6 @@ function precomputeCurTraceLayouts() {
     curLayout = curLayout.filter(function(row) {return row.length > 1});
 
     curTraceLayouts.push(curLayout);
-    console.log('END precomputeCurTraceLayouts', i);
-    idsToRemove.forEach(function (id, xxx) {console.log('  idsToRemove:', id);});
   });
 
   curTraceLayouts.splice(0, 1); // remove seeded empty sentinel element

From 38e1b7325c3837f99e5fb4d30a8585e9366a03c3 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 6 Aug 2012 17:40:12 -0700
Subject: [PATCH 039/502] started porting over to using d3 more exclusively for
 heap rendering

---
 PyTutorGAE/js/edu-python.js | 74 +++++++++++++++++++++++++++----------
 1 file changed, 54 insertions(+), 20 deletions(-)

diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 418158fc6..6460c3198 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -605,7 +605,8 @@ function updateOutput() {
 
 
   // finally, render all the data structures!!!
-  renderDataStructures(curEntry, "#dataViz");
+  var curToplevelLayout = curTraceLayouts[curInstr];
+  renderDataStructures(curEntry, curToplevelLayout, "#dataViz");
 }
 
 
@@ -678,6 +679,7 @@ function structurallyEquivalent(obj1, obj2) {
 
 
 // Renders the current trace entry (curEntry) into the div named by vizDiv
+// using the top-level heap layout provided by toplevelHeapLayout
 //
 // The "3.0" version of renderDataStructures renders variables in
 // a stack, values in a separate heap, and draws line connectors
@@ -694,7 +696,7 @@ function structurallyEquivalent(obj1, obj2) {
 // INLINE within each stack frame without any explicit representation
 // of data structure aliasing. That is, aliased objects were rendered
 // multiple times, and a unique ID label was used to identify aliases.
-function renderDataStructures(curEntry, vizDiv) {
+function renderDataStructures(curEntry, toplevelHeapLayout, vizDiv) {
 
   // VERY VERY IMPORTANT --- and reset ALL jsPlumb state to prevent
   // weird mis-behavior!!!
@@ -714,18 +716,6 @@ function renderDataStructures(curEntry, vizDiv) {
   // Heap object rendering phase:
 
 
-
-  // VERY VERY experimental!!!
-  // when doing this for realz, convert to using d3 and use row ID tag
-  // as unique object ID for object constancy.
-  var curEntryLayout = curTraceLayouts[curInstr];
-
-  var toplevelHeapLayout = curEntryLayout.map(function(row) {
-    return row.slice(1, row.length); // KRAZY!!! remove row ID tag for now
-  });
-
-
-
   // Key:   CSS ID of the div element representing the stack frame variable
   //        (for stack->heap connections) or heap object (for heap->heap connections)
   //        the format is: 'heap_pointer_src_'
@@ -749,20 +739,64 @@ function renderDataStructures(curEntry, vizDiv) {
 
 
   // render the heap by mapping toplevelHeapLayout into  and 

From f7726f5b4d8080c6efda5a5e27f7b12e3bda98c5 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 6 Aug 2012 21:27:23 -0700
Subject: [PATCH 041/502] sorta works a bit better

---
 PyTutorGAE/js/edu-python.js | 28 ++++++----------------------
 1 file changed, 6 insertions(+), 22 deletions(-)

diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 6065b083a..d2527450d 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -756,29 +756,22 @@ function renderDataStructures(curEntry, toplevelHeapLayout, vizDiv) {
     .data(function(d, i) {return d.slice(1, d.length);}, /* map over each row, skipping row ID tag */
           function(objID) {return objID;} /* each object ID is unique for constancy */)
 
-  heapColumns.each(function(objID, i) {
-      console.log('UPDATE ELT', objID);
+  heapColumns
+    .order() // VERY IMPORTANT to put in the order corresponding to data elements
+    // d3 automatically adds NEW elements to the update selection, to prevent code duplication
+    .each(function(objID, i) {
+      console.log('NEW/UPDATE ELT', objID);
       // TODO: add a smoother transition in the future
       // Right now, just delete the old element and render a new one in its place
       $(this).empty();
       renderCompoundObject(objID, $(this), true);
     })
 
-  // the problem here is that new columns are always appended at the end of the row using append().
-  // e.g., if you have a transition from ['row1', 1] to ['row1', 2, 1], you want the column
-  // for object 2 to be inserted BEFORE than the one for object 1, but right now it's inserted AFTER.
-  // insert() allows insertion based on some constant selector, though.
-  // an alternative is to simply append() and then sort the table columns somehow in the each()?
-  heapColumns.enter().insert('td', ':first-child')
+  heapColumns.enter().append('td')
     .attr('class', 'toplevelHeapObject')
     .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;})
-    .each(function(objID, i) {
-      console.log('NEW ELT', objID);
-      renderCompoundObject(objID, $(this), true);
-    })
 
   heapColumns.exit()
-    .each(function(objID, i) {console.log('DEL ELT:', objID, i); $(this).empty();})
     .remove()
 
 
@@ -789,15 +782,6 @@ function renderDataStructures(curEntry, toplevelHeapLayout, vizDiv) {
     .selectAll('td')
     .data(function(d, i) {return d.slice(1, d.length);}, /* map over each row, skipping row ID tag */
           function(objID) {return objID;} /* each object ID is unique for constancy */)
-    // TODO: I don't think we need to handle updates to elements of NEW rows, since all of the
-    // constituent elements are going to be new by definition
-    //.each(function(objID, i) {
-    //  console.log('UPDATE ELT B', objID);
-    //  // TODO: add a smoother transition in the future
-    //  // Right now, just delete the old element and render a new one in its place
-    //  $(this).empty();
-    //  renderCompoundObject(objID, $(this), true);
-    //})
     .enter().append('td')
     .attr('class', 'toplevelHeapObject')
     .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;})

From 5f1d652977f24238f61fc95c55518d6255a7ec8b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 6 Aug 2012 21:40:19 -0700
Subject: [PATCH 042/502] woohoo removed printfs

---
 PyTutorGAE/js/edu-python.js | 35 +++++++++++++++++++++--------------
 1 file changed, 21 insertions(+), 14 deletions(-)

diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index d2527450d..7a4e5d864 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -739,9 +739,8 @@ function renderDataStructures(curEntry, toplevelHeapLayout, vizDiv) {
   });
 
 
-  // render the heap by mapping toplevelHeapLayout into 
 elements using d3
-  d3.select(vizDiv + ' #heap')
-    .selectAll('table')
-    .data(toplevelHeapLayout)
-    .enter().append('table')
+
+  // TODO: make the #heap div PERSISTENT so that d3 can know how to properly handle transitions
+
+  var heapRows = d3.select(vizDiv + ' #heap')
+    .selectAll('table.heapRow')
+    .data(toplevelHeapLayout, function(objLst) {
+      return objLst[0]; // return first element, which is the row ID tag
+  })
+
+
+  // update existing heap row
+  heapRows.each(function(objLst, i) { console.log('UPDATE ROW:', objLst, i); })
+    .selectAll('td')
+    .data(function(d, i) {return d.slice(1, d.length);}, /* map over each row, skipping row ID tag */
+          function(objID) {return objID;} /* each object ID is unique for constancy */)
+    .each(function(objID, i) {
+      console.log('UPDATE ELT', objID);
+      // TODO: how do we sensibly render an UPDATE to an element?
+    })
+    .enter().append('td')
+    .attr('class', 'toplevelHeapObject')
+    .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;})
+    .each(function(objID, i) {
+      console.log('NEW ELT', objID);
+      renderCompoundObject(objID, $(this), true);
+    })
+
+    // TODO: handle exit
+    //.exit()
+    //.each(function(objID, i) {console.log('DEL ELT:', objID, i);})
+    //.remove()
+
+
+  // insert new heap rows
+  heapRows.enter().append('table')
+    .each(function(objLst, i) {console.log('NEW ROW:', objLst, i);})
     .attr('class', 'heapRow')
     .selectAll('td')
-    .data(function(d, i) {return d;}) // map over each row ...
+    .data(function(d, i) {return d.slice(1, d.length);}, /* map over each row, skipping row ID tag */
+          function(objID) {return objID;} /* each object ID is unique for constancy */)
+    .each(function(objID, i) {
+      console.log('UPDATE ELT', objID);
+      // TODO: how do we sensibly render an UPDATE to an element?
+    })
     .enter().append('td')
     .attr('class', 'toplevelHeapObject')
     .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;})
     .each(function(objID, i) {
-      renderCompoundObject(objID, $(this), true); // label FOOBAR (see renderedObjectIDs)
+      console.log('NEW ELT', objID);
+      renderCompoundObject(objID, $(this), true);
     });
 
+  // remove deleted rows
+  heapRows.exit()
+    .each(function(objLst, i) {console.log('DEL ROW:', objLst, i);})
+    .remove();
+
+
 
   function renderNestedObject(obj, d3DomElement) {
     if (isPrimitiveType(obj)) {

From 6202b3c525ef308e3b0b638ad58e5681045acb0a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 6 Aug 2012 18:44:47 -0700
Subject: [PATCH 040/502] start playing with d3 for stuff ... aghhh

---
 PyTutorGAE/js/edu-python.js | 56 ++++++++++++++++++++++---------------
 PyTutorGAE/tutor.html       | 19 ++++++++++++-
 2 files changed, 51 insertions(+), 24 deletions(-)

diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 6460c3198..6065b083a 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -138,6 +138,10 @@ function enterVisualizeMode(jumpToEnd) {
 
   }
 
+  // clear stack and heap visualizations:
+  $('#dataViz #stack').html('
Frames
')
+  $('#dataViz #heap').html('
Objects
')
+
 
   // remove any existing sliders
   $('#executionSlider').slider('destroy');
@@ -702,13 +706,10 @@ function renderDataStructures(curEntry, toplevelHeapLayout, vizDiv) {
   // weird mis-behavior!!!
   jsPlumb.reset();
 
-  $(vizDiv).empty(); // jQuery empty() is better than .html('')
-
-
-  // create a tabular layout for stack and heap side-by-side
-  // TODO: figure out how to do this using CSS in a robust way!
-  $(vizDiv).html('
');
 
+  // clear the stack and render it from scratch.
+  // the heap must be PERSISTENT so that d3 can render heap transitions.
+  $(vizDiv + " #stack").empty();
   $(vizDiv + " #stack").append('
Frames
');
 
 
@@ -750,15 +751,25 @@ function renderDataStructures(curEntry, toplevelHeapLayout, vizDiv) {
 
 
   // update existing heap row
-  heapRows.each(function(objLst, i) { console.log('UPDATE ROW:', objLst, i); })
+  var heapColumns = heapRows.each(function(objLst, i) { console.log('UPDATE ROW:', objLst, i); })
     .selectAll('td')
     .data(function(d, i) {return d.slice(1, d.length);}, /* map over each row, skipping row ID tag */
           function(objID) {return objID;} /* each object ID is unique for constancy */)
-    .each(function(objID, i) {
+
+  heapColumns.each(function(objID, i) {
       console.log('UPDATE ELT', objID);
-      // TODO: how do we sensibly render an UPDATE to an element?
+      // TODO: add a smoother transition in the future
+      // Right now, just delete the old element and render a new one in its place
+      $(this).empty();
+      renderCompoundObject(objID, $(this), true);
     })
-    .enter().append('td')
+
+  // the problem here is that new columns are always appended at the end of the row using append().
+  // e.g., if you have a transition from ['row1', 1] to ['row1', 2, 1], you want the column
+  // for object 2 to be inserted BEFORE than the one for object 1, but right now it's inserted AFTER.
+  // insert() allows insertion based on some constant selector, though.
+  // an alternative is to simply append() and then sort the table columns somehow in the each()?
+  heapColumns.enter().insert('td', ':first-child')
     .attr('class', 'toplevelHeapObject')
     .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;})
     .each(function(objID, i) {
@@ -766,10 +777,9 @@ function renderDataStructures(curEntry, toplevelHeapLayout, vizDiv) {
       renderCompoundObject(objID, $(this), true);
     })
 
-    // TODO: handle exit
-    //.exit()
-    //.each(function(objID, i) {console.log('DEL ELT:', objID, i);})
-    //.remove()
+  heapColumns.exit()
+    .each(function(objID, i) {console.log('DEL ELT:', objID, i); $(this).empty();})
+    .remove()
 
 
   // insert new heap rows
@@ -779,10 +789,15 @@ function renderDataStructures(curEntry, toplevelHeapLayout, vizDiv) {
     .selectAll('td')
     .data(function(d, i) {return d.slice(1, d.length);}, /* map over each row, skipping row ID tag */
           function(objID) {return objID;} /* each object ID is unique for constancy */)
-    .each(function(objID, i) {
-      console.log('UPDATE ELT', objID);
-      // TODO: how do we sensibly render an UPDATE to an element?
-    })
+    // TODO: I don't think we need to handle updates to elements of NEW rows, since all of the
+    // constituent elements are going to be new by definition
+    //.each(function(objID, i) {
+    //  console.log('UPDATE ELT B', objID);
+    //  // TODO: add a smoother transition in the future
+    //  // Right now, just delete the old element and render a new one in its place
+    //  $(this).empty();
+    //  renderCompoundObject(objID, $(this), true);
+    //})
     .enter().append('td')
     .attr('class', 'toplevelHeapObject')
     .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;})
@@ -1021,11 +1036,6 @@ function renderDataStructures(curEntry, toplevelHeapLayout, vizDiv) {
   }
 
 
-  // prepend heap header after all the dust settles:
-  $(vizDiv + ' #heap').prepend('
Objects
');
-
-
-
   // Render globals and then stack frames:
   // TODO: could convert to using d3 to map globals and stack frames directly into stack frame divs
   // (which might make it easier to do smooth transitions)
diff --git a/PyTutorGAE/tutor.html b/PyTutorGAE/tutor.html
index 3da922e43..28dfdf551 100644
--- a/PyTutorGAE/tutor.html
+++ b/PyTutorGAE/tutor.html
@@ -198,7 +198,24 @@
 		
 
 
-

+

+
+  
+    
+      
+      
+    
+  

+        

+          
Frames

+        

+      		
+        

+          
Objects

+        

+      

+
+

 
 		
 
 and \
       
 elements using d3
-
-  // TODO: make the #heap div PERSISTENT so that d3 can know how to properly handle transitions
+  // use d3 to render the heap by mapping toplevelHeapLayout into 
+  // and ');
-          tbl.append('');
-        }
-        else {
-          tbl.append('');
-        }
-
-        var curTr = tbl.find('tr:last');
-
-        if (isPrimitiveType(val)) {
-          renderPrimitiveObject(val, curTr.find("td.stackFrameValue"));
-        }
-        else {
-          // add a stub so that we can connect it with a connector later.
-          // IE needs this div to be NON-EMPTY in order to properly
-          // render jsPlumb endpoints, so that's why we add an " "!
-
-          // make sure varname doesn't contain any weird
-          // characters that are illegal for CSS ID's ...
-          var varDivID = divID + '__' + varnameToCssID(varname);
-          curTr.find("td.stackFrameValue").append('
 
');
-
-          assert(connectionEndpointIDs[varDivID] === undefined);
-          var heapObjID = 'heap_object_' + getObjectID(val);
-          connectionEndpointIDs[varDivID] = heapObjID;
-        }
-      });
-    }
-  }
-
-
-  // finally add all the connectors!
-  for (varID in connectionEndpointIDs) {
-    var valueID = connectionEndpointIDs[varID];
-    jsPlumb.connect({source: varID, target: valueID});
-  }
-
-
-  function highlight_frame(frameID) {
-    var allConnections = jsPlumb.getConnections();
-    for (var i = 0; i < allConnections.length; i++) {
-      var c = allConnections[i];
-
-      // this is VERY VERY fragile code, since it assumes that going up
-      // five layers of parent() calls will get you from the source end
-      // of the connector to the enclosing stack frame
-      var stackFrameDiv = c.source.parent().parent().parent().parent().parent();
-
-      // if this connector starts in the selected stack frame ...
-      if (stackFrameDiv.attr('id') == frameID) {
-        // then HIGHLIGHT IT!
-        c.setPaintStyle({lineWidth:1, strokeStyle: darkBlue});
-        c.endpoints[0].setPaintStyle({fillStyle: darkBlue});
-        c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
-
-        // ... and move it to the VERY FRONT
-        $(c.canvas).css("z-index", 1000);
-      }
-      // for heap->heap connectors
-      else if (heapConnectionEndpointIDs[c.endpoints[0].elementId] !== undefined) {
-        // then HIGHLIGHT IT!
-        c.setPaintStyle({lineWidth:1, strokeStyle: darkBlue}); // make thinner
-        c.endpoints[0].setPaintStyle({fillStyle: darkBlue});
-        c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
-        //c.setConnector([ "Bezier", {curviness: 80} ]); // make it more curvy
-        c.setConnector([ "StateMachine" ]);
-        c.addOverlay([ "Arrow", { length: 10, width:7, foldback:0.55, location:1 }]);
-      }
-      else {
-        // else unhighlight it
-        c.setPaintStyle({lineWidth:1, strokeStyle: lightGray});
-        c.endpoints[0].setPaintStyle({fillStyle: lightGray});
-        c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
-        $(c.canvas).css("z-index", 0);
-      }
-    }
-
-    // clear everything, then just activate $(this) one ...
-    $(".stackFrame").removeClass("highlightedStackFrame");
-    $('#' + frameID).addClass("highlightedStackFrame");
-  }
-
-
-  // highlight the top-most non-zombie stack frame or, if not available, globals
-  var frame_already_highlighted = false;
-  $.each(stack_to_render, function(i, e) {
-    if (e.is_highlighted) {
-      highlight_frame('stack' + i);
-      frame_already_highlighted = true;
-    }
-  });
-
-  if (!frame_already_highlighted) {
-    highlight_frame('globals');
-  }
-
-}
-
-
-function isPrimitiveType(obj) {
-  var typ = typeof obj;
-  return ((obj == null) || (typ != "object"));
-}
-
-function getRefID(obj) {
-  assert(obj[0] == 'REF');
-  return obj[1];
-}
-
-/*
-function renderInline(obj) {
-  return isPrimitiveType(obj) && (typeof obj != 'string');
-}
-*/
-
-// Key is a primitive value (e.g., 'hello', 3.14159, true)
-// Value is a unique primitive ID (starting with 'p' to disambiguate
-// from regular object IDs)
-var primitive_IDs = {null: 'p0', true: 'p1', false: 'p2'};
-var cur_pID = 3;
-
-function getObjectID(obj) {
-  if (isPrimitiveType(obj)) {
-    // primitive objects get IDs starting with 'p' ...
-    // this renders aliases as 'interned' for simplicity
-    var pID = primitive_IDs[obj];
-    if (pID !== undefined) {
-      return pID;
-    }
-    else {
-      var new_pID = 'p' + cur_pID;
-      primitive_IDs[obj] = new_pID;
-      cur_pID++;
-      return new_pID;
-    }
-    return obj;
-  }
-  else {
-    assert($.isArray(obj));
-
-    if ((obj[0] == 'INSTANCE') || (obj[0] == 'CLASS')) {
-      return obj[2];
-    }
-    else {
-      return obj[1];
-    }
-  }
-}
-
-
-
-String.prototype.rtrim = function() {
-  return this.replace(/\s*$/g, "");
-}
-
-
-function renderPyCodeOutput(codeStr) {
-  clearSliderBreakpoints(); // start fresh!
-
-  var lines = codeStr.rtrim().split('\n');
-
-  // reset it!
-  codeOutputLines = [];
-  $.each(lines, function(i, cod) {
-    var n = {};
-    n.text = cod;
-    n.lineNumber = i + 1;
-    n.executionPoints = [];
-    n.backgroundColor = null;
-    n.breakpointHere = false;
-
-
-    $.each(curTrace, function(i, elt) {
-      if (elt.line == n.lineNumber) {
-        n.executionPoints.push(i);
-      }
-    });
-
-
-    // if there is a comment containing 'breakpoint' and this line was actually executed,
-    // then set a breakpoint on this line
-    var breakpointInComment = false;
-    toks = cod.split('#');
-    for (var j = 1 /* start at index 1, not 0 */; j < toks.length; j++) {
-      if (toks[j].indexOf('breakpoint') != -1) {
-        breakpointInComment = true;
-      }
-    }
-
-    if (breakpointInComment && n.executionPoints.length > 0) {
-      n.breakpointHere = true;
-      addToBreakpoints(n.executionPoints);
-    }
-
-    codeOutputLines.push(n);
-  });
-
-
-  $("#pyCodeOutputDiv").empty(); // jQuery empty() is better than .html('')
-
-
-  // maps codeOutputLines to both table columns
-  d3.select('#pyCodeOutputDiv')
-    .append('table')
-    .attr('id', 'pyCodeOutput')
-    .selectAll('tr')
-    .data(codeOutputLines)
-    .enter().append('tr')
-    .selectAll('td')
-    .data(function(e, i){return [e, e];}) // bind an alias of the element to both table columns
-    .enter().append('td')
-    .attr('class', function(d, i) {return (i == 0) ? 'lineNo' : 'cod';})
-    .style('cursor', function(d, i) {return 'pointer'})
-    .html(function(d, i) {
-      if (i == 0) {
-        return d.lineNumber;
-      }
-      else {
-        return htmlspecialchars(d.text);
-      }
-     })
-    .on('mouseover', function() {
-      setHoverBreakpoint(this);
-     })
-    .on('mouseout', function() {
-      hoverBreakpoints = {};
-
-      var breakpointHere = d3.select(this).datum().breakpointHere;
-
-      if (!breakpointHere) {
-        unsetBreakpoint(this);
-      }
-
-      renderSliderBreakpoints(); // get rid of hover breakpoint colors
-     })
-    .on('mousedown', function() {
-      // don't do anything if exePts is empty
-      // (i.e., this line was never executed)
-      var exePts = d3.select(this).datum().executionPoints;
-      if (!exePts || exePts.length == 0) {
-        return;
-      }
-
-      // toggle breakpoint
-      d3.select(this).datum().breakpointHere = !d3.select(this).datum().breakpointHere;
-
-      var breakpointHere = d3.select(this).datum().breakpointHere;
-      if (breakpointHere) {
-        setBreakpoint(this);
-      }
-      else {
-        unsetBreakpoint(this);
-      }
-     });
-
-  renderSliderBreakpoints(); // renders breakpoints written in as code comments
-}
-
-
-
-var breakpoints = {}; // set of execution points to set as breakpoints
-var sortedBreakpointsList = []; // sorted and synced with breakpointLines
-var hoverBreakpoints = {}; // set of breakpoints because we're HOVERING over a given line
-
-
-function _getSortedBreakpointsList() {
-  var ret = [];
-  for (var k in breakpoints) {
-    ret.push(Number(k)); // these should be NUMBERS, not strings
-  }
-  ret.sort(function(x,y){return x-y}); // WTF, javascript sort is lexicographic by default!
-  return ret;
-}
-
-function addToBreakpoints(executionPoints) {
-  $.each(executionPoints, function(i, e) {
-    breakpoints[e] = 1;
-  });
-
-  sortedBreakpointsList = _getSortedBreakpointsList();
-}
-
-function removeFromBreakpoints(executionPoints) {
-  $.each(executionPoints, function(i, e) {
-    delete breakpoints[e];
-  });
-
-  sortedBreakpointsList = _getSortedBreakpointsList();
-}
-
-// find the previous/next breakpoint to c or return -1 if it doesn't exist
-function findPrevBreakpoint(c) {
-  if (sortedBreakpointsList.length == 0) {
-    return -1;
-  }
-  else {
-    for (var i = 1; i < sortedBreakpointsList.length; i++) {
-      var prev = sortedBreakpointsList[i-1];
-      var cur = sortedBreakpointsList[i];
-
-      if (c <= prev) {
-        return -1;
-      }
-
-      if (cur >= c) {
-        return prev;
-      }
-    }
-
-    // final edge case:
-    var lastElt = sortedBreakpointsList[sortedBreakpointsList.length - 1];
-    return (lastElt < c) ? lastElt : -1;
-  }
-}
-
-function findNextBreakpoint(c) {
-  if (sortedBreakpointsList.length == 0) {
-    return -1;
-  }
-  else {
-    for (var i = 0; i < sortedBreakpointsList.length - 1; i++) {
-      var cur = sortedBreakpointsList[i];
-      var next = sortedBreakpointsList[i+1];
-
-      if (c < cur) {
-        return cur;
-      }
-
-      if (cur <= c && c < next) { // subtle
-        return next;
-      }
-    }
-
-    // final edge case:
-    var lastElt = sortedBreakpointsList[sortedBreakpointsList.length - 1];
-    return (lastElt > c) ? lastElt : -1;
-  }
-}
-
-
-function setHoverBreakpoint(t) {
-  var exePts = d3.select(t).datum().executionPoints;
-
-  // don't do anything if exePts is empty
-  // (i.e., this line was never executed)
-  if (!exePts || exePts.length == 0) {
-    return;
-  }
-
-  hoverBreakpoints = {};
-  $.each(exePts, function(i, e) {
-    hoverBreakpoints[e] = 1;
-  });
-
-  addToBreakpoints(exePts);
-  renderSliderBreakpoints();
-}
-
-
-function setBreakpoint(t) {
-  var exePts = d3.select(t).datum().executionPoints;
-
-  // don't do anything if exePts is empty
-  // (i.e., this line was never executed)
-  if (!exePts || exePts.length == 0) {
-    return;
-  }
-
-  addToBreakpoints(exePts);
-
-  d3.select(t.parentNode).select('td.lineNo').style('color', breakpointColor);
-  d3.select(t.parentNode).select('td.lineNo').style('font-weight', 'bold');
-
-  renderSliderBreakpoints();
-}
-
-function unsetBreakpoint(t) {
-  var exePts = d3.select(t).datum().executionPoints;
-
-  // don't do anything if exePts is empty
-  // (i.e., this line was never executed)
-  if (!exePts || exePts.length == 0) {
-    return;
-  }
-
-  removeFromBreakpoints(exePts);
-
-
-  var lineNo = d3.select(t).datum().lineNumber;
-
-  if (visitedLinesSet[lineNo]) {
-    d3.select(t.parentNode).select('td.lineNo').style('color', visitedLineColor);
-    d3.select(t.parentNode).select('td.lineNo').style('font-weight', 'bold');
-  }
-  else {
-    d3.select(t.parentNode).select('td.lineNo').style('color', '');
-    d3.select(t.parentNode).select('td.lineNo').style('font-weight', '');
-  }
-
-  renderSliderBreakpoints();
-}
-
-
-// depends on sortedBreakpointsList global
-function renderSliderBreakpoints() {
-  $("#executionSliderFooter").empty(); // jQuery empty() is better than .html('')
-
-  // I originally didn't want to delete and re-create this overlay every time,
-  // but if I don't do so, there are weird flickering artifacts with clearing
-  // the SVG container; so it's best to just delete and re-create the container each time
-  var sliderOverlay = d3.select('#executionSliderFooter')
-    .append('svg')
-    .attr('id', 'sliderOverlay')
-    .attr('width', $('#executionSlider').width())
-    .attr('height', 12);
-
-  var xrange = d3.scale.linear()
-    .domain([0, curTrace.length - 1])
-    .range([0, $('#executionSlider').width()]);
-
-  sliderOverlay.selectAll('rect')
-      .data(sortedBreakpointsList)
-    .enter().append('rect')
-      .attr('x', function(d, i) {
-        // make the edge cases look decent
-        if (d == 0) {
-          return 0;
-        }
-        else {
-          return xrange(d) - 3;
-        }
-      })
-      .attr('y', 0)
-      .attr('width', 2)
-      .attr('height', 12)
-      .style('fill', function(d) {
-         if (hoverBreakpoints[d] === undefined) {
-           return breakpointColor;
-         }
-         else {
-           return hoverBreakpointColor;
-         }
-       });
-}
-
-
-function clearSliderBreakpoints() {
-  breakpoints = {};
-  sortedBreakpointsList = [];
-  hoverBreakpoints = {};
-  renderSliderBreakpoints();
-}
-
-
-
-// initialization function that should be called when the page is loaded
-function eduPythonCommonInit() {
-
-  $("#jmpFirstInstr").click(function() {
-    curInstr = 0;
-    updateOutput();
-  });
-
-  $("#jmpLastInstr").click(function() {
-    curInstr = curTrace.length - 1;
-    updateOutput();
-  });
-
-  $("#jmpStepBack").click(function() {
-    if (curInstr > 0) {
-      curInstr -= 1;
-      updateOutput();
-    }
-  });
-
-  $("#jmpStepFwd").click(function() {
-    if (curInstr < curTrace.length - 1) {
-      curInstr += 1;
-      updateOutput();
-    }
-  });
-
-  // disable controls initially ...
-  $("#vcrControls #jmpFirstInstr").attr("disabled", true);
-  $("#vcrControls #jmpStepBack").attr("disabled", true);
-  $("#vcrControls #jmpStepFwd").attr("disabled", true);
-  $("#vcrControls #jmpLastInstr").attr("disabled", true);
-
-
-
-  // set some sensible jsPlumb defaults
-  jsPlumb.Defaults.Endpoint = ["Dot", {radius:3}];
-  //jsPlumb.Defaults.Endpoint = ["Rectangle", {width:3, height:3}];
-  jsPlumb.Defaults.EndpointStyle = {fillStyle: lightGray};
-
-  jsPlumb.Defaults.Anchors = ["RightMiddle", "LeftMiddle"]; // for aesthetics!
-
-  jsPlumb.Defaults.PaintStyle = {lineWidth:1, strokeStyle: lightGray};
-
-  // bezier curve style:
-  //jsPlumb.Defaults.Connector = [ "Bezier", { curviness:15 }]; /* too much 'curviness' causes lines to run together */
-  //jsPlumb.Defaults.Overlays = [[ "Arrow", { length: 14, width:10, foldback:0.55, location:0.35 }]]
-
-  // state machine curve style:
-  jsPlumb.Defaults.Connector = [ "StateMachine" ];
-  jsPlumb.Defaults.Overlays = [[ "Arrow", { length: 10, width:7, foldback:0.55, location:1 }]];
-
-
-  jsPlumb.Defaults.EndpointHoverStyle = {fillStyle: pinkish};
-  jsPlumb.Defaults.HoverPaintStyle = {lineWidth:2, strokeStyle: pinkish};
-
-
-  // set keyboard event listeners ...
-  $(document).keydown(function(k) {
-    // ONLY capture keys if we're in 'visualize code' mode:
-    if (appMode == 'visualize' && !keyStuckDown) {
-      if (k.keyCode == 37) { // left arrow
-        if (curInstr > 0) {
-          // if there is a prev breakpoint, then jump to it ...
-          if (sortedBreakpointsList.length > 0) {
-            var prevBreakpoint = findPrevBreakpoint(curInstr);
-            if (prevBreakpoint != -1) {
-              curInstr = prevBreakpoint;
-            }
-            else {
-              curInstr -= 1; // prevent keyboard keys from "getting stuck" on a solitary breakpoint
-            }
-          }
-          else {
-            curInstr -= 1;
-          }
-          updateOutput();
-        }
-
-        k.preventDefault(); // don't horizontally scroll the display
-
-        keyStuckDown = true;
-      }
-      else if (k.keyCode == 39) { // right arrow
-        if (curInstr < curTrace.length - 1) {
-          // if there is a next breakpoint, then jump to it ...
-          if (sortedBreakpointsList.length > 0) {
-            var nextBreakpoint = findNextBreakpoint(curInstr);
-            if (nextBreakpoint != -1) {
-              curInstr = nextBreakpoint;
-            }
-            else {
-              curInstr += 1; // prevent keyboard keys from "getting stuck" on a solitary breakpoint
-            }
-          }
-          else {
-            curInstr += 1;
-          }
-          updateOutput();
-        }
-
-        k.preventDefault(); // don't horizontally scroll the display
-
-        keyStuckDown = true;
-      }
-    }
-  });
-
-  $(document).keyup(function(k) {
-    keyStuckDown = false;
-  });
-
-
-  // redraw everything on window resize so that connectors are in the
-  // right place
-  // TODO: can be SLOW on older browsers!!!
-  $(window).resize(function() {
-    if (appMode == 'visualize') {
-      updateOutput();
-    }
-  });
-
-  $("#classicModeCheckbox").click(function() {
-    if (appMode == 'visualize') {
-      updateOutput();
-    }
-  });
-
-
-  // log a generic AJAX error handler
-  $(document).ajaxError(function() {
-    alert("Server error (possibly due to memory/resource overload).");
-
-    $('#executeBtn').html("Visualize execution");
-    $('#executeBtn').attr('disabled', false);
-  });
-
-}
-
diff --git a/PyTutorGAE/js/tmp-mess-with-d3/tutor.html b/PyTutorGAE/js/tmp-mess-with-d3/tutor.html
deleted file mode 100644
index 94c76d900..000000000
--- a/PyTutorGAE/js/tmp-mess-with-d3/tutor.html
+++ /dev/null
@@ -1,255 +0,0 @@
-
-
-
-
-
-
-  Online Python Tutor (v3)
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-

-
-Write your Python code here:
-

-
-
 
-
-

-
-
-
-

-
-
Try these small examples:

-
-aliasing |
-intro |
-factorial |
-fibonacci |
-memoized fib |
-square root |
-insertion sort
-

-filter |
-tokenize |
-OOP |
-gcd |
-sumList |
-towers of hanoi |
-exceptions
-
-

-
-
From MIT's 6.01 course:

-
-list map |
-summation |
-OOP 1 |
-OOP 2 |
-inheritance
-
-

-
-
Nested functions:
-

-
-closure 1 |
-closure 2 |
-closure 3 |
-closure 4 |
-closure 5
-
-

-
-
Aliasing:
-

-
-aliasing 1 |
-aliasing 2 |
-aliasing 3 |
-aliasing 4 |
-aliasing 5 |
-aliasing 6 |
-aliasing 7
-
-

-
-
Linked lists:
-

-
-LL 1 |
-LL 2
-
-

-
-
-

-
-
-
 elements
 
   var heapRows = d3.select(vizDiv + ' #heap')
     .selectAll('table.heapRow')
@@ -750,34 +749,40 @@ function renderDataStructures(curEntry, toplevelHeapLayout, vizDiv) {
   })
 
 
-  // update existing heap row
-  var heapColumns = heapRows.each(function(objLst, i) { console.log('UPDATE ROW:', objLst, i); })
+  // update an existing heap row
+  var heapColumns = heapRows
+    //.each(function(objLst, i) { console.log('UPDATE ROW:', objLst, i); })
     .selectAll('td')
     .data(function(d, i) {return d.slice(1, d.length);}, /* map over each row, skipping row ID tag */
           function(objID) {return objID;} /* each object ID is unique for constancy */)
 
+  // ENTER
+  heapColumns.enter().append('td')
+    .attr('class', 'toplevelHeapObject')
+    .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;})
+    // remember that the enter selection is added to the update
+    // selection so that we can process it later ...
+
+  // UPDATE
   heapColumns
     .order() // VERY IMPORTANT to put in the order corresponding to data elements
-    // d3 automatically adds NEW elements to the update selection, to prevent code duplication
     .each(function(objID, i) {
-      console.log('NEW/UPDATE ELT', objID);
+      //console.log('NEW/UPDATE ELT', objID);
+
       // TODO: add a smoother transition in the future
       // Right now, just delete the old element and render a new one in its place
       $(this).empty();
       renderCompoundObject(objID, $(this), true);
     })
 
-  heapColumns.enter().append('td')
-    .attr('class', 'toplevelHeapObject')
-    .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;})
-
+  // EXIT
   heapColumns.exit()
     .remove()
 
 
   // insert new heap rows
   heapRows.enter().append('table')
-    .each(function(objLst, i) {console.log('NEW ROW:', objLst, i);})
+    //.each(function(objLst, i) {console.log('NEW ROW:', objLst, i);})
     .attr('class', 'heapRow')
     .selectAll('td')
     .data(function(d, i) {return d.slice(1, d.length);}, /* map over each row, skipping row ID tag */
@@ -786,13 +791,15 @@ function renderDataStructures(curEntry, toplevelHeapLayout, vizDiv) {
     .attr('class', 'toplevelHeapObject')
     .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;})
     .each(function(objID, i) {
-      console.log('NEW ELT', objID);
+      //console.log('NEW ELT', objID);
+
+      // TODO: add a smoother transition in the future
       renderCompoundObject(objID, $(this), true);
     });
 
   // remove deleted rows
   heapRows.exit()
-    .each(function(objLst, i) {console.log('DEL ROW:', objLst, i);})
+    //.each(function(objLst, i) {console.log('DEL ROW:', objLst, i);})
     .remove();
 
 

From d12b0fe532daf6c29f9b021d2db9c411b010b725 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 6 Aug 2012 22:20:30 -0700
Subject: [PATCH 043/502] fixed weird scrolly bug :/

---
 PyTutorGAE/js/edu-python.js | 10 ++++++----
 PyTutorGAE/tutor.html       |  3 ++-
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 7a4e5d864..96118b6cf 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -138,9 +138,10 @@ function enterVisualizeMode(jumpToEnd) {
 
   }
 
+
   // clear stack and heap visualizations:
-  $('#dataViz #stack').html('
Frames
')
-  $('#dataViz #heap').html('
Objects
')
+  $('#dataViz #stack').html('
Frames
');
+  $('#dataViz #heap').html('
Objects
');
 
 
   // remove any existing sliders
@@ -1323,8 +1324,9 @@ function renderPyCodeOutput(codeStr) {
     codeOutputLines.push(n);
   });
 
-
-  $("#pyCodeOutputDiv").empty(); // jQuery empty() is better than .html('')
+  // re-create a pyCodeOutputDiv from scratch each time to prevent weird
+  // scrolling bugs ... ugh hacky
+  $('#pyCodeOutputDivWrapper').html('
');
 
 
   // maps codeOutputLines to both table columns
diff --git a/PyTutorGAE/tutor.html b/PyTutorGAE/tutor.html
index 28dfdf551..6d041f922 100644
--- a/PyTutorGAE/tutor.html
+++ b/PyTutorGAE/tutor.html
@@ -158,7 +158,8 @@
 
 

 
-

+

+

 
 

 

From 92132da511b93eb8b6d81ebcebf5cab8aebf7d6c Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 7 Aug 2012 10:36:16 -0700
Subject: [PATCH 044/502] start refactoringgg

---
 PyTutorGAE/js/edu-python-tutor.js |   1 -
 PyTutorGAE/js/edu-python.js       | 358 ++++++++++++++----------------
 PyTutorGAE/tutor.html             |  12 +-
 3 files changed, 173 insertions(+), 198 deletions(-)

diff --git a/PyTutorGAE/js/edu-python-tutor.js b/PyTutorGAE/js/edu-python-tutor.js
index 43d1cb2a0..47b28af61 100644
--- a/PyTutorGAE/js/edu-python-tutor.js
+++ b/PyTutorGAE/js/edu-python-tutor.js
@@ -375,7 +375,6 @@ $(document).ready(function() {
   }
 
 
-  // TODO: refactor so that it applies to edu-python-questions.js as well ...
 
   $('#executionSlider').bind('slide', function(evt, ui) {
     // this is SUPER subtle. if this value was changed programmatically,
diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 96118b6cf..0f35e4576 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -31,11 +31,6 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // since the latter might exhibit funny behavior for certain reserved keywords
 
 
-// code that is common to all Online Python Tutor pages
-
-var appMode = 'edit'; // 'edit', 'visualize', or 'grade' (only for question.html)
-
-
 /* colors - see edu-python.css */
 var lightYellow = '#F5F798';
 var lightLineColor = '#FFFFCC';
@@ -55,6 +50,10 @@ var breakpointColor = pinkish;
 var hoverBreakpointColor = medLightBlue;
 
 
+
+var appMode = 'edit'; // 'edit', 'visualize', or 'grade' (only for question.html)
+
+
 var keyStuckDown = false;
 
 
@@ -84,29 +83,7 @@ var visitedLinesSet = {} // YUCKY GLOBAL!
 // been reached
 var instrLimitReached = false;
 
-function assert(cond) {
-  if (!cond) {
-    alert("Error: ASSERTION FAILED");
-  }
-}
-
-// taken from http://www.toao.net/32-my-htmlspecialchars-function-for-javascript
-function htmlspecialchars(str) {
-  if (typeof(str) == "string") {
-    str = str.replace(/&/g, "&"); /* must do & first */
-
-    // ignore these for now ...
-    //str = str.replace(/"/g, """);
-    //str = str.replace(/'/g, "'");
 
-    str = str.replace(//g, ">");
-
-    // replace spaces:
-    str = str.replace(/ /g, " ");
-  }
-  return str;
-}
 
 function enterVisualizeMode(jumpToEnd) {
   curInstr = 0;
@@ -165,6 +142,7 @@ function enterVisualizeMode(jumpToEnd) {
   updateOutput();
 }
 
+
 function highlightCodeLine(curLine, hasError, isTerminated) {
   d3.selectAll('#pyCodeOutputDiv td.lineNo')
     .attr('id', function(d) {return 'lineNo' + d.lineNumber;})
@@ -202,39 +180,42 @@ function highlightCodeLine(curLine, hasError, isTerminated) {
       }
     });
 
-  // smoothly scroll code display
-  if (!isOutputLineVisible(curLine)) {
-    scrollCodeOutputToLine(curLine);
-  }
-}
 
 
-// smoothly scroll pyCodeOutputDiv so that the given line is at the center
-function scrollCodeOutputToLine(lineNo) {
-  var lineNoTd = $('#lineNo' + lineNo);
-  var LO = lineNoTd.offset().top;
+  // returns True iff lineNo is visible in pyCodeOutputDiv
+  function isOutputLineVisible(lineNo) {
+    var lineNoTd = $('#lineNo' + lineNo);
+    var LO = lineNoTd.offset().top;
 
-  var codeOutputDiv = $('#pyCodeOutputDiv');
-  var PO = codeOutputDiv.offset().top;
-  var ST = codeOutputDiv.scrollTop();
-  var H = codeOutputDiv.height();
+    var codeOutputDiv = $('#pyCodeOutputDiv');
+    var PO = codeOutputDiv.offset().top;
+    var ST = codeOutputDiv.scrollTop();
+    var H = codeOutputDiv.height();
 
-  codeOutputDiv.animate({scrollTop: (ST + (LO - PO - (Math.round(H / 2))))}, 300);
-}
+    // add a few pixels of fudge factor on the bottom end due to bottom scrollbar
+    return (PO <= LO) && (LO < (PO + H - 15));
+  }
 
 
-// returns True iff lineNo is visible in pyCodeOutputDiv
-function isOutputLineVisible(lineNo) {
-  var lineNoTd = $('#lineNo' + lineNo);
-  var LO = lineNoTd.offset().top;
+  // smoothly scroll pyCodeOutputDiv so that the given line is at the center
+  function scrollCodeOutputToLine(lineNo) {
+    var lineNoTd = $('#lineNo' + lineNo);
+    var LO = lineNoTd.offset().top;
 
-  var codeOutputDiv = $('#pyCodeOutputDiv');
-  var PO = codeOutputDiv.offset().top;
-  var ST = codeOutputDiv.scrollTop();
-  var H = codeOutputDiv.height();
+    var codeOutputDiv = $('#pyCodeOutputDiv');
+    var PO = codeOutputDiv.offset().top;
+    var ST = codeOutputDiv.scrollTop();
+    var H = codeOutputDiv.height();
 
-  // add a few pixels of fudge factor on the bottom end due to bottom scrollbar
-  return (PO <= LO) && (LO < (PO + H - 15));
+    codeOutputDiv.animate({scrollTop: (ST + (LO - PO - (Math.round(H / 2))))}, 300);
+  }
+
+
+
+  // smoothly scroll code display
+  if (!isOutputLineVisible(curLine)) {
+    scrollCodeOutputToLine(curLine);
+  }
 }
 
 
@@ -615,73 +596,6 @@ function updateOutput() {
 }
 
 
-// make sure varname doesn't contain any weird
-// characters that are illegal for CSS ID's ...
-//
-// I know for a fact that iterator tmp variables named '_[1]'
-// are NOT legal names for CSS ID's.
-// I also threw in '{', '}', '(', ')', '<', '>' as illegal characters.
-//
-// TODO: what other characters are illegal???
-var lbRE = new RegExp('\\[|{|\\(|<', 'g');
-var rbRE = new RegExp('\\]|}|\\)|>', 'g');
-function varnameToCssID(varname) {
-  return varname.replace(lbRE, 'LeftB_').replace(rbRE, '_RightB');
-}
-
-
-// compare two JSON-encoded compound objects for structural equivalence:
-function structurallyEquivalent(obj1, obj2) {
-  // punt if either isn't a compound type
-  if (isPrimitiveType(obj1) || isPrimitiveType(obj2)) {
-    return false;
-  }
-
-  // must be the same compound type
-  if (obj1[0] != obj2[0]) {
-    return false;
-  }
-
-  // must have the same number of elements or fields
-  if (obj1.length != obj2.length) {
-    return false;
-  }
-
-  // for a list or tuple, same size (e.g., a cons cell is a list/tuple of size 2)
-  if (obj1[0] == 'LIST' || obj1[0] == 'TUPLE') {
-    return true;
-  }
-  else {
-    var startingInd = -1;
-
-    if (obj1[0] == 'DICT') {
-      startingInd = 2;
-    }
-    else if (obj1[0] == 'INSTANCE') {
-      startingInd = 3;
-    }
-    else {
-      return false;
-    }
-
-    var obj1fields = {};
-
-    // for a dict or object instance, same names of fields (ordering doesn't matter)
-    for (var i = startingInd; i < obj1.length; i++) {
-      obj1fields[obj1[i][0]] = 1; // use as a set
-    }
-
-    for (var i = startingInd; i < obj2.length; i++) {
-      if (obj1fields[obj2[i][0]] == undefined) {
-        return false;
-      }
-    }
-
-    return true;
-  }
-}
-
-
 
 // Renders the current trace entry (curEntry) into the div named by vizDiv
 // using the top-level heap layout provided by toplevelHeapLayout
@@ -1150,7 +1064,7 @@ function renderDataStructures(curEntry, toplevelHeapLayout, vizDiv) {
           curTr.find("td.stackFrameValue").append('
 
');
 
           assert(connectionEndpointIDs[varDivID] === undefined);
-          var heapObjID = 'heap_object_' + getObjectID(val);
+          var heapObjID = 'heap_object_' + getRefID(val);
           connectionEndpointIDs[varDivID] = heapObjID;
         }
       });
@@ -1226,63 +1140,6 @@ function renderDataStructures(curEntry, toplevelHeapLayout, vizDiv) {
 }
 
 
-function isPrimitiveType(obj) {
-  var typ = typeof obj;
-  return ((obj == null) || (typ != "object"));
-}
-
-function getRefID(obj) {
-  assert(obj[0] == 'REF');
-  return obj[1];
-}
-
-/*
-function renderInline(obj) {
-  return isPrimitiveType(obj) && (typeof obj != 'string');
-}
-*/
-
-// Key is a primitive value (e.g., 'hello', 3.14159, true)
-// Value is a unique primitive ID (starting with 'p' to disambiguate
-// from regular object IDs)
-var primitive_IDs = {null: 'p0', true: 'p1', false: 'p2'};
-var cur_pID = 3;
-
-function getObjectID(obj) {
-  if (isPrimitiveType(obj)) {
-    // primitive objects get IDs starting with 'p' ...
-    // this renders aliases as 'interned' for simplicity
-    var pID = primitive_IDs[obj];
-    if (pID !== undefined) {
-      return pID;
-    }
-    else {
-      var new_pID = 'p' + cur_pID;
-      primitive_IDs[obj] = new_pID;
-      cur_pID++;
-      return new_pID;
-    }
-    return obj;
-  }
-  else {
-    assert($.isArray(obj));
-
-    if ((obj[0] == 'INSTANCE') || (obj[0] == 'CLASS')) {
-      return obj[2];
-    }
-    else {
-      return obj[1];
-    }
-  }
-}
-
-
-
-String.prototype.rtrim = function() {
-  return this.replace(/\s*$/g, "");
-}
-
-
 function renderPyCodeOutput(codeStr) {
   clearSliderBreakpoints(); // start fresh!
 
@@ -1353,7 +1210,7 @@ function renderPyCodeOutput(codeStr) {
       setHoverBreakpoint(this);
      })
     .on('mouseout', function() {
-      hoverBreakpoints = {};
+      hoverBreakpoints = d3.map();
 
       var breakpointHere = d3.select(this).datum().breakpointHere;
 
@@ -1388,23 +1245,23 @@ function renderPyCodeOutput(codeStr) {
 
 
 
-var breakpoints = {}; // set of execution points to set as breakpoints
+var breakpoints = d3.map(); // set of execution points to set as breakpoints
 var sortedBreakpointsList = []; // sorted and synced with breakpointLines
-var hoverBreakpoints = {}; // set of breakpoints because we're HOVERING over a given line
+var hoverBreakpoints = d3.map(); // set of breakpoints because we're HOVERING over a given line
 
 
 function _getSortedBreakpointsList() {
   var ret = [];
-  for (var k in breakpoints) {
+  breakpoints.forEach(function(k, v) {
     ret.push(Number(k)); // these should be NUMBERS, not strings
-  }
+  });
   ret.sort(function(x,y){return x-y}); // WTF, javascript sort is lexicographic by default!
   return ret;
 }
 
 function addToBreakpoints(executionPoints) {
   $.each(executionPoints, function(i, e) {
-    breakpoints[e] = 1;
+    breakpoints.set(e, 1);
   });
 
   sortedBreakpointsList = _getSortedBreakpointsList();
@@ -1412,7 +1269,7 @@ function addToBreakpoints(executionPoints) {
 
 function removeFromBreakpoints(executionPoints) {
   $.each(executionPoints, function(i, e) {
-    delete breakpoints[e];
+    breakpoints.remove(e);
   });
 
   sortedBreakpointsList = _getSortedBreakpointsList();
@@ -1477,9 +1334,9 @@ function setHoverBreakpoint(t) {
     return;
   }
 
-  hoverBreakpoints = {};
+  hoverBreakpoints = d3.map();
   $.each(exePts, function(i, e) {
-    hoverBreakpoints[e] = 1;
+    hoverBreakpoints.set(e, 1);
   });
 
   addToBreakpoints(exePts);
@@ -1564,7 +1421,7 @@ function renderSliderBreakpoints() {
       .attr('width', 2)
       .attr('height', 12)
       .style('fill', function(d) {
-         if (hoverBreakpoints[d] === undefined) {
+         if (!hoverBreakpoints.has(d)) {
            return breakpointColor;
          }
          else {
@@ -1575,9 +1432,9 @@ function renderSliderBreakpoints() {
 
 
 function clearSliderBreakpoints() {
-  breakpoints = {};
+  breakpoints = d3.map();
   sortedBreakpointsList = [];
-  hoverBreakpoints = {};
+  hoverBreakpoints = d3.map();
   renderSliderBreakpoints();
 }
 
@@ -1722,3 +1579,126 @@ function eduPythonCommonInit() {
 
 }
 
+
+
+
+
+// Utilities
+
+function assert(cond) {
+  if (!cond) {
+    alert("Error: ASSERTION FAILED");
+  }
+}
+
+// taken from http://www.toao.net/32-my-htmlspecialchars-function-for-javascript
+function htmlspecialchars(str) {
+  if (typeof(str) == "string") {
+    str = str.replace(/&/g, "&"); /* must do & first */
+
+    // ignore these for now ...
+    //str = str.replace(/"/g, """);
+    //str = str.replace(/'/g, "'");
+
+    str = str.replace(//g, ">");
+
+    // replace spaces:
+    str = str.replace(/ /g, " ");
+  }
+  return str;
+}
+
+String.prototype.rtrim = function() {
+  return this.replace(/\s*$/g, "");
+}
+
+
+// make sure varname doesn't contain any weird
+// characters that are illegal for CSS ID's ...
+//
+// I know for a fact that iterator tmp variables named '_[1]'
+// are NOT legal names for CSS ID's.
+// I also threw in '{', '}', '(', ')', '<', '>' as illegal characters.
+//
+// TODO: what other characters are illegal???
+var lbRE = new RegExp('\\[|{|\\(|<', 'g');
+var rbRE = new RegExp('\\]|}|\\)|>', 'g');
+function varnameToCssID(varname) {
+  return varname.replace(lbRE, 'LeftB_').replace(rbRE, '_RightB');
+}
+
+
+// compare two JSON-encoded compound objects for structural equivalence:
+function structurallyEquivalent(obj1, obj2) {
+  // punt if either isn't a compound type
+  if (isPrimitiveType(obj1) || isPrimitiveType(obj2)) {
+    return false;
+  }
+
+  // must be the same compound type
+  if (obj1[0] != obj2[0]) {
+    return false;
+  }
+
+  // must have the same number of elements or fields
+  if (obj1.length != obj2.length) {
+    return false;
+  }
+
+  // for a list or tuple, same size (e.g., a cons cell is a list/tuple of size 2)
+  if (obj1[0] == 'LIST' || obj1[0] == 'TUPLE') {
+    return true;
+  }
+  else {
+    var startingInd = -1;
+
+    if (obj1[0] == 'DICT') {
+      startingInd = 2;
+    }
+    else if (obj1[0] == 'INSTANCE') {
+      startingInd = 3;
+    }
+    else {
+      return false;
+    }
+
+    var obj1fields = {};
+
+    // for a dict or object instance, same names of fields (ordering doesn't matter)
+    for (var i = startingInd; i < obj1.length; i++) {
+      obj1fields[obj1[i][0]] = 1; // use as a set
+    }
+
+    for (var i = startingInd; i < obj2.length; i++) {
+      if (obj1fields[obj2[i][0]] == undefined) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+}
+
+
+function isPrimitiveType(obj) {
+  var typ = typeof obj;
+  return ((obj == null) || (typ != "object"));
+}
+
+function getRefID(obj) {
+  assert(obj[0] == 'REF');
+  return obj[1];
+}
+
+function getObjectID(obj) {
+  assert($.isArray(obj));
+
+  if ((obj[0] == 'INSTANCE') || (obj[0] == 'CLASS')) {
+    return obj[2];
+  }
+  else {
+    return obj[1];
+  }
+}
+
diff --git a/PyTutorGAE/tutor.html b/PyTutorGAE/tutor.html
index 6d041f922..b9342bd99 100644
--- a/PyTutorGAE/tutor.html
+++ b/PyTutorGAE/tutor.html
@@ -147,12 +147,6 @@
 
 
 
-
-  
-
-
 ');
-        var curTr = tbl.find('tr:last');
-
-        if (isPrimitiveType(val)) {
-          renderPrimitiveObject(val, curTr.find("td.stackFrameValue"));
-        }
-        else{
-          // add a stub so that we can connect it with a connector later.
-          // IE needs this div to be NON-EMPTY in order to properly
-          // render jsPlumb endpoints, so that's why we add an " "!
-
-          // make sure varname doesn't contain any weird
-          // characters that are illegal for CSS ID's ...
-          var varDivID = 'global__' + varnameToCssID(varname);
-          curTr.find("td.stackFrameValue").append('
 
');
-
-          assert(connectionEndpointIDs[varDivID] === undefined);
-          var heapObjID = 'heap_object_' + getRefID(val);
-          connectionEndpointIDs[varDivID] = heapObjID;
-        }
-      }
-    });
-  }
-
-
-  $.each(stack_to_render, function(i, e) {
-    renderStackFrame(e, i, e.is_zombie);
-  });
-
-
-  function renderStackFrame(frame, ind, is_zombie) {
-    var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
-    var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
-
-    // optional (btw, this isn't a CSS id)
-    var parentFrameID = null;
-    if (frame.parent_frame_id_list.length > 0) {
-      parentFrameID = frame.parent_frame_id_list[0];
-    }
-
-    var localVars = frame.encoded_locals
-
-    // the stackFrame div's id is simply its index ("stack")
-
-    var divClass, divID, headerDivID;
-    if (is_zombie) {
-      divClass = 'zombieStackFrame';
-      divID = "zombie_stack" + ind;
-      headerDivID = "zombie_stack_header" + ind;
-    }
-    else {
-      divClass = 'stackFrame';
-      divID = "stack" + ind;
-      headerDivID = "stack_header" + ind;
-    }
-
-    $(vizDiv + " #stack").append('
');
-
-    var headerLabel = funcName + '()';
-    if (frameID) {
-      headerLabel = 'f' + frameID + ': ' + headerLabel;
-    }
-    if (parentFrameID) {
-      headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
-    }
-    $(vizDiv + " #stack #" + divID).append('
' + headerLabel + '
');
-
-    if (frame.ordered_varnames.length > 0) {
-      var tableID = divID + '_table';
-      $(vizDiv + " #stack #" + divID).append('

-    
-  

 
 
@@ -167,8 +161,10 @@
 
 
 
-
Use the slider or the left and right arrow keys to step through execution.
-
Click on code to set breakpoints.

+

+  Use the left and right arrow keys to step through execution.
+  
Click on lines of code to set breakpoints.
+

 
 

 


From e8f385d43482e466f62eb98a2a17d7b2abd2d4ec Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 7 Aug 2012 10:45:47 -0700
Subject: [PATCH 045/502] more refactoring goodness

---
 PyTutorGAE/js/edu-python-tutor.js |  59 ++-------------
 PyTutorGAE/js/edu-python.js       | 118 ++++++++++++++++++++----------
 2 files changed, 86 insertions(+), 91 deletions(-)

diff --git a/PyTutorGAE/js/edu-python-tutor.js b/PyTutorGAE/js/edu-python-tutor.js
index 47b28af61..5e6d69bf4 100644
--- a/PyTutorGAE/js/edu-python-tutor.js
+++ b/PyTutorGAE/js/edu-python-tutor.js
@@ -34,38 +34,6 @@ function enterEditMode() {
   $.bbq.pushState({ mode: 'edit' }, 2 /* completely override other hash strings to keep URL clean */);
 }
 
-function preprocessBackendResult(traceData, inputCode) {
-  // set gross globals, then let jQuery BBQ take care of the rest
-  curTrace = traceData;
-  curInputCode = inputCode;
-
-  renderPyCodeOutput(inputCode);
-
-
-  // must postprocess traceData prior to running precomputeCurTraceLayouts() ...
-  var lastEntry = curTrace[curTrace.length - 1];
-
-  // GLOBAL!
-  instrLimitReached = (lastEntry.event == 'instruction_limit_reached');
-
-  if (instrLimitReached) {
-    curTrace.pop() // kill last entry
-    var warningMsg = lastEntry.exception_msg;
-    $("#errorOutput").html(htmlspecialchars(warningMsg));
-    $("#errorOutput").show();
-  }
-  // as imran suggests, for a (non-error) one-liner, SNIP off the
-  // first instruction so that we start after the FIRST instruction
-  // has been executed ...
-  else if (curTrace.length == 2) {
-    curTrace.shift();
-  }
-
-  precomputeCurTraceLayouts(); // bam!
-
-  $.bbq.pushState({ mode: 'visualize' }, 2 /* completely override other hash strings to keep URL clean */);
-}
-
 
 var pyInputCodeMirror; // CodeMirror object that contains the input text
 
@@ -153,7 +121,7 @@ $(document).ready(function() {
     $('#executeBtn').attr('disabled', true);
     $("#pyOutputPane").hide();
 
-    // TODO: is GET or POST best here?
+
     $.get("exec",
           {user_script : pyInputCodeMirror.getValue()},
           function(traceData) {
@@ -186,7 +154,7 @@ $(document).ready(function() {
               $('#executeBtn').attr('disabled', false);
             }
             else {
-              preprocessBackendResult(traceData, pyInputCodeMirror.getValue());
+              createVisualization(traceData, pyInputCodeMirror.getValue());
             }
           },
           "json");
@@ -375,24 +343,13 @@ $(document).ready(function() {
   }
 
 
+  // log a generic AJAX error handler
+  // TODO: too global!
+  $(document).ajaxError(function() {
+    alert("Server error (possibly due to memory/resource overload).");
 
-  $('#executionSlider').bind('slide', function(evt, ui) {
-    // this is SUPER subtle. if this value was changed programmatically,
-    // then evt.originalEvent will be undefined. however, if this value
-    // was changed by a user-initiated event, then this code should be
-    // executed ...
-    if (evt.originalEvent) {
-      curInstr = ui.value;
-      updateOutput(true); // need to pass 'true' here to prevent infinite loop
-    }
-  });
-
-
-  $('#genUrlBtn').bind('click', function() {
-    // override mode with 'visualize' ...
-    var urlStr = jQuery.param.fragment(window.location.href, {code: curInputCode, curInstr: curInstr}, 2);
-
-    $('#urlOutput').val(urlStr);
+    $('#executeBtn').html("Visualize execution");
+    $('#executeBtn').attr('disabled', false);
   });
 
 });
diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 0f35e4576..2a2be36f1 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -31,25 +31,6 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // since the latter might exhibit funny behavior for certain reserved keywords
 
 
-/* colors - see edu-python.css */
-var lightYellow = '#F5F798';
-var lightLineColor = '#FFFFCC';
-var errorColor = '#F87D76';
-var visitedLineColor = '#3D58A2';
-
-var lightGray = "#cccccc";
-var darkBlue = "#3D58A2";
-var medBlue = "#41507A";
-var medLightBlue = "#6F89D1";
-var lightBlue = "#899CD1";
-var pinkish = "#F15149";
-var lightPink = "#F89D99";
-var darkRed = "#9D1E18";
-
-var breakpointColor = pinkish;
-var hoverBreakpointColor = medLightBlue;
-
-
 
 var appMode = 'edit'; // 'edit', 'visualize', or 'grade' (only for question.html)
 
@@ -85,6 +66,41 @@ var instrLimitReached = false;
 
 
 
+function createVisualization(traceData, inputCode) {
+  // set gross globals, then let jQuery BBQ take care of the rest
+  curTrace = traceData;
+  curInputCode = inputCode;
+
+  renderPyCodeOutput(inputCode);
+
+
+  // must postprocess traceData prior to running precomputeCurTraceLayouts() ...
+  var lastEntry = curTrace[curTrace.length - 1];
+
+  // GLOBAL!
+  instrLimitReached = (lastEntry.event == 'instruction_limit_reached');
+
+  if (instrLimitReached) {
+    curTrace.pop() // kill last entry
+    var warningMsg = lastEntry.exception_msg;
+    $("#errorOutput").html(htmlspecialchars(warningMsg));
+    $("#errorOutput").show();
+  }
+  // as imran suggests, for a (non-error) one-liner, SNIP off the
+  // first instruction so that we start after the FIRST instruction
+  // has been executed ...
+  else if (curTrace.length == 2) {
+    curTrace.shift();
+  }
+
+  precomputeCurTraceLayouts(); // bam!
+
+  $.bbq.pushState({ mode: 'visualize' }, 2 /* completely override other hash strings to keep URL clean */);
+}
+
+
+
+
 function enterVisualizeMode(jumpToEnd) {
   curInstr = 0;
 
@@ -1443,6 +1459,27 @@ function clearSliderBreakpoints() {
 // initialization function that should be called when the page is loaded
 function eduPythonCommonInit() {
 
+  $('#executionSlider').bind('slide', function(evt, ui) {
+    // this is SUPER subtle. if this value was changed programmatically,
+    // then evt.originalEvent will be undefined. however, if this value
+    // was changed by a user-initiated event, then this code should be
+    // executed ...
+    if (evt.originalEvent) {
+      curInstr = ui.value;
+      updateOutput(true); // need to pass 'true' here to prevent infinite loop
+    }
+  });
+
+
+  $('#genUrlBtn').bind('click', function() {
+    // override mode with 'visualize' ...
+    var urlStr = jQuery.param.fragment(window.location.href, {code: curInputCode, curInstr: curInstr}, 2);
+
+    $('#urlOutput').val(urlStr);
+  });
+
+
+
   $("#jmpFirstInstr").click(function() {
     curInstr = 0;
     updateOutput();
@@ -1498,6 +1535,7 @@ function eduPythonCommonInit() {
 
 
   // set keyboard event listeners ...
+  // TODO: too global!
   $(document).keydown(function(k) {
     // ONLY capture keys if we're in 'visualize code' mode:
     if (appMode == 'visualize' && !keyStuckDown) {
@@ -1548,6 +1586,7 @@ function eduPythonCommonInit() {
     }
   });
 
+  // TODO: too global!
   $(document).keyup(function(k) {
     keyStuckDown = false;
   });
@@ -1556,6 +1595,7 @@ function eduPythonCommonInit() {
   // redraw everything on window resize so that connectors are in the
   // right place
   // TODO: can be SLOW on older browsers!!!
+  // TODO: too global!
   $(window).resize(function() {
     if (appMode == 'visualize') {
       updateOutput();
@@ -1567,27 +1607,36 @@ function eduPythonCommonInit() {
       updateOutput();
     }
   });
+}
 
 
-  // log a generic AJAX error handler
-  $(document).ajaxError(function() {
-    alert("Server error (possibly due to memory/resource overload).");
-
-    $('#executeBtn').html("Visualize execution");
-    $('#executeBtn').attr('disabled', false);
-  });
 
-}
+// Utilities
 
 
+/* colors - see edu-python.css */
+var lightYellow = '#F5F798';
+var lightLineColor = '#FFFFCC';
+var errorColor = '#F87D76';
+var visitedLineColor = '#3D58A2';
 
+var lightGray = "#cccccc";
+var darkBlue = "#3D58A2";
+var medBlue = "#41507A";
+var medLightBlue = "#6F89D1";
+var lightBlue = "#899CD1";
+var pinkish = "#F15149";
+var lightPink = "#F89D99";
+var darkRed = "#9D1E18";
 
+var breakpointColor = pinkish;
+var hoverBreakpointColor = medLightBlue;
 
-// Utilities
 
 function assert(cond) {
+  // TODO: add more precision in the error message
   if (!cond) {
-    alert("Error: ASSERTION FAILED");
+    alert("Error: ASSERTION FAILED!!!");
   }
 }
 
@@ -1691,14 +1740,3 @@ function getRefID(obj) {
   return obj[1];
 }
 
-function getObjectID(obj) {
-  assert($.isArray(obj));
-
-  if ((obj[0] == 'INSTANCE') || (obj[0] == 'CLASS')) {
-    return obj[2];
-  }
-  else {
-    return obj[1];
-  }
-}
-

From 2b8f9c219e1bbc76da64335d9dcb58c9a5fa1fee Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 7 Aug 2012 10:49:11 -0700
Subject: [PATCH 046/502] moar!

---
 PyTutorGAE/js/edu-python-tutor.js | 2 +-
 PyTutorGAE/js/edu-python.js       | 8 ++++----
 PyTutorGAE/tutor.html             | 2 +-
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/PyTutorGAE/js/edu-python-tutor.js b/PyTutorGAE/js/edu-python-tutor.js
index 5e6d69bf4..3b097d3d1 100644
--- a/PyTutorGAE/js/edu-python-tutor.js
+++ b/PyTutorGAE/js/edu-python-tutor.js
@@ -154,7 +154,7 @@ $(document).ready(function() {
               $('#executeBtn').attr('disabled', false);
             }
             else {
-              createVisualization(traceData, pyInputCodeMirror.getValue());
+              createVisualization(traceData, pyInputCodeMirror.getValue(), $('#pyOutputPane'));
             }
           },
           "json");
diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index 2a2be36f1..e5a043e7a 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -66,7 +66,9 @@ var instrLimitReached = false;
 
 
 
-function createVisualization(traceData, inputCode) {
+function createVisualization(traceData, inputCode, domRoot) {
+
+
   // set gross globals, then let jQuery BBQ take care of the rest
   curTrace = traceData;
   curInputCode = inputCode;
@@ -1197,9 +1199,7 @@ function renderPyCodeOutput(codeStr) {
     codeOutputLines.push(n);
   });
 
-  // re-create a pyCodeOutputDiv from scratch each time to prevent weird
-  // scrolling bugs ... ugh hacky
-  $('#pyCodeOutputDivWrapper').html('
');
+  $('#pyCodeOutputDiv').empty();
 
 
   // maps codeOutputLines to both table columns
diff --git a/PyTutorGAE/tutor.html b/PyTutorGAE/tutor.html
index b9342bd99..fab696160 100644
--- a/PyTutorGAE/tutor.html
+++ b/PyTutorGAE/tutor.html
@@ -152,7 +152,7 @@
 
 

 
-

+

 

 
 


From bde444f441731ca85d814be76e03acbb4df37c79 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 7 Aug 2012 11:00:26 -0700
Subject: [PATCH 047/502] moar moar!

---
 PyTutorGAE/js/edu-python-tutor.js |   8 +-
 PyTutorGAE/js/edu-python.js       | 363 ++++++++++++++++--------------
 PyTutorGAE/tutor.html             |  77 +------
 3 files changed, 204 insertions(+), 244 deletions(-)

diff --git a/PyTutorGAE/js/edu-python-tutor.js b/PyTutorGAE/js/edu-python-tutor.js
index 3b097d3d1..297133aad 100644
--- a/PyTutorGAE/js/edu-python-tutor.js
+++ b/PyTutorGAE/js/edu-python-tutor.js
@@ -29,6 +29,9 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 // Pre-reqs: edu-python.js and jquery.ba-bbq.min.js should be imported BEFORE this file
 
+var appMode = 'edit'; // 'edit', 'visualize', or 'grade' (only for question.html)
+
+
 
 function enterEditMode() {
   $.bbq.pushState({ mode: 'edit' }, 2 /* completely override other hash strings to keep URL clean */);
@@ -43,7 +46,6 @@ function setCodeMirrorVal(dat) {
 
 
 $(document).ready(function() {
-  eduPythonCommonInit(); // must call this first!
 
   pyInputCodeMirror = CodeMirror(document.getElementById('codeInputPane'), {
     mode: 'python',
@@ -161,10 +163,6 @@ $(document).ready(function() {
   });
 
 
-  $("#editBtn").click(function() {
-    enterEditMode();
-  });
-
 
   // canned examples
 
diff --git a/PyTutorGAE/js/edu-python.js b/PyTutorGAE/js/edu-python.js
index e5a043e7a..a1532e9d6 100644
--- a/PyTutorGAE/js/edu-python.js
+++ b/PyTutorGAE/js/edu-python.js
@@ -27,14 +27,6 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
 
-// TODO: look into using the d3.map class instead of direct object operations in js,
-// since the latter might exhibit funny behavior for certain reserved keywords
-
-
-
-var appMode = 'edit'; // 'edit', 'visualize', or 'grade' (only for question.html)
-
-
 var keyStuckDown = false;
 
 
@@ -68,6 +60,206 @@ var instrLimitReached = false;
 
 function createVisualization(traceData, inputCode, domRoot) {
 
+  // TODO: make less gross!
+  domRoot.html(
+  '\
+    \
+      \
+      \
+    \
+  
\
+        
\
+          
\
+          
\
+            \
+          
\
+          
\
+            Use the left and right arrow keys to step through execution.\
+            
Click on lines of code to set breakpoints.\
+          
\
+          
\
+          
\
+          
\
+            \
+            \
+            Step ? of ?\
+            \
+            \
+          
\
+          
\
+        
\
+        Program output:
\
+        \
+        
 
\
+      		\
+        
\
+          \
+            \
+              \
+              \
+            \
+          
\
+                
\
+                  
Frames
\
+                
\
+              		\
+                
\
+                  
Objects
\
+                
\
+              
\
+        
\
+      
');
+
+
+
+  $('#executionSlider').bind('slide', function(evt, ui) {
+    // this is SUPER subtle. if this value was changed programmatically,
+    // then evt.originalEvent will be undefined. however, if this value
+    // was changed by a user-initiated event, then this code should be
+    // executed ...
+    if (evt.originalEvent) {
+      curInstr = ui.value;
+      updateOutput(true); // need to pass 'true' here to prevent infinite loop
+    }
+  });
+
+
+  $('#genUrlBtn').bind('click', function() {
+    // override mode with 'visualize' ...
+    var urlStr = jQuery.param.fragment(window.location.href, {code: curInputCode, curInstr: curInstr}, 2);
+
+    $('#urlOutput').val(urlStr);
+  });
+
+  $("#editBtn").click(function() {
+    enterEditMode();
+  });
+
+
+
+  $("#jmpFirstInstr").click(function() {
+    curInstr = 0;
+    updateOutput();
+  });
+
+  $("#jmpLastInstr").click(function() {
+    curInstr = curTrace.length - 1;
+    updateOutput();
+  });
+
+  $("#jmpStepBack").click(function() {
+    if (curInstr > 0) {
+      curInstr -= 1;
+      updateOutput();
+    }
+  });
+
+  $("#jmpStepFwd").click(function() {
+    if (curInstr < curTrace.length - 1) {
+      curInstr += 1;
+      updateOutput();
+    }
+  });
+
+  // disable controls initially ...
+  $("#vcrControls #jmpFirstInstr").attr("disabled", true);
+  $("#vcrControls #jmpStepBack").attr("disabled", true);
+  $("#vcrControls #jmpStepFwd").attr("disabled", true);
+  $("#vcrControls #jmpLastInstr").attr("disabled", true);
+
+
+
+  // set some sensible jsPlumb defaults
+  jsPlumb.Defaults.Endpoint = ["Dot", {radius:3}];
+  //jsPlumb.Defaults.Endpoint = ["Rectangle", {width:3, height:3}];
+  jsPlumb.Defaults.EndpointStyle = {fillStyle: lightGray};
+
+  jsPlumb.Defaults.Anchors = ["RightMiddle", "LeftMiddle"]; // for aesthetics!
+
+  jsPlumb.Defaults.PaintStyle = {lineWidth:1, strokeStyle: lightGray};
+
+  // bezier curve style:
+  //jsPlumb.Defaults.Connector = [ "Bezier", { curviness:15 }]; /* too much 'curviness' causes lines to run together */
+  //jsPlumb.Defaults.Overlays = [[ "Arrow", { length: 14, width:10, foldback:0.55, location:0.35 }]]
+
+  // state machine curve style:
+  jsPlumb.Defaults.Connector = [ "StateMachine" ];
+  jsPlumb.Defaults.Overlays = [[ "Arrow", { length: 10, width:7, foldback:0.55, location:1 }]];
+
+
+  jsPlumb.Defaults.EndpointHoverStyle = {fillStyle: pinkish};
+  jsPlumb.Defaults.HoverPaintStyle = {lineWidth:2, strokeStyle: pinkish};
+
+
+  // set keyboard event listeners ...
+  // TODO: too global!
+  $(document).keydown(function(k) {
+    // ONLY capture keys if we're in 'visualize code' mode:
+    if (appMode == 'visualize' && !keyStuckDown) {
+      if (k.keyCode == 37) { // left arrow
+        if (curInstr > 0) {
+          // if there is a prev breakpoint, then jump to it ...
+          if (sortedBreakpointsList.length > 0) {
+            var prevBreakpoint = findPrevBreakpoint(curInstr);
+            if (prevBreakpoint != -1) {
+              curInstr = prevBreakpoint;
+            }
+            else {
+              curInstr -= 1; // prevent keyboard keys from "getting stuck" on a solitary breakpoint
+            }
+          }
+          else {
+            curInstr -= 1;
+          }
+          updateOutput();
+        }
+
+        k.preventDefault(); // don't horizontally scroll the display
+
+        keyStuckDown = true;
+      }
+      else if (k.keyCode == 39) { // right arrow
+        if (curInstr < curTrace.length - 1) {
+          // if there is a next breakpoint, then jump to it ...
+          if (sortedBreakpointsList.length > 0) {
+            var nextBreakpoint = findNextBreakpoint(curInstr);
+            if (nextBreakpoint != -1) {
+              curInstr = nextBreakpoint;
+            }
+            else {
+              curInstr += 1; // prevent keyboard keys from "getting stuck" on a solitary breakpoint
+            }
+          }
+          else {
+            curInstr += 1;
+          }
+          updateOutput();
+        }
+
+        k.preventDefault(); // don't horizontally scroll the display
+
+        keyStuckDown = true;
+      }
+    }
+  });
+
+  // TODO: too global!
+  $(document).keyup(function(k) {
+    keyStuckDown = false;
+  });
+
+
+  // redraw everything on window resize so that connectors are in the
+  // right place
+  // TODO: can be SLOW on older browsers!!!
+  // TODO: too global!
+  $(window).resize(function() {
+    if (appMode == 'visualize') {
+      updateOutput();
+    }
+  });
+
+
 
   // set gross globals, then let jQuery BBQ take care of the rest
   curTrace = traceData;
@@ -1456,161 +1648,6 @@ function clearSliderBreakpoints() {
 
 
 
-// initialization function that should be called when the page is loaded
-function eduPythonCommonInit() {
-
-  $('#executionSlider').bind('slide', function(evt, ui) {
-    // this is SUPER subtle. if this value was changed programmatically,
-    // then evt.originalEvent will be undefined. however, if this value
-    // was changed by a user-initiated event, then this code should be
-    // executed ...
-    if (evt.originalEvent) {
-      curInstr = ui.value;
-      updateOutput(true); // need to pass 'true' here to prevent infinite loop
-    }
-  });
-
-
-  $('#genUrlBtn').bind('click', function() {
-    // override mode with 'visualize' ...
-    var urlStr = jQuery.param.fragment(window.location.href, {code: curInputCode, curInstr: curInstr}, 2);
-
-    $('#urlOutput').val(urlStr);
-  });
-
-
-
-  $("#jmpFirstInstr").click(function() {
-    curInstr = 0;
-    updateOutput();
-  });
-
-  $("#jmpLastInstr").click(function() {
-    curInstr = curTrace.length - 1;
-    updateOutput();
-  });
-
-  $("#jmpStepBack").click(function() {
-    if (curInstr > 0) {
-      curInstr -= 1;
-      updateOutput();
-    }
-  });
-
-  $("#jmpStepFwd").click(function() {
-    if (curInstr < curTrace.length - 1) {
-      curInstr += 1;
-      updateOutput();
-    }
-  });
-
-  // disable controls initially ...
-  $("#vcrControls #jmpFirstInstr").attr("disabled", true);
-  $("#vcrControls #jmpStepBack").attr("disabled", true);
-  $("#vcrControls #jmpStepFwd").attr("disabled", true);
-  $("#vcrControls #jmpLastInstr").attr("disabled", true);
-
-
-
-  // set some sensible jsPlumb defaults
-  jsPlumb.Defaults.Endpoint = ["Dot", {radius:3}];
-  //jsPlumb.Defaults.Endpoint = ["Rectangle", {width:3, height:3}];
-  jsPlumb.Defaults.EndpointStyle = {fillStyle: lightGray};
-
-  jsPlumb.Defaults.Anchors = ["RightMiddle", "LeftMiddle"]; // for aesthetics!
-
-  jsPlumb.Defaults.PaintStyle = {lineWidth:1, strokeStyle: lightGray};
-
-  // bezier curve style:
-  //jsPlumb.Defaults.Connector = [ "Bezier", { curviness:15 }]; /* too much 'curviness' causes lines to run together */
-  //jsPlumb.Defaults.Overlays = [[ "Arrow", { length: 14, width:10, foldback:0.55, location:0.35 }]]
-
-  // state machine curve style:
-  jsPlumb.Defaults.Connector = [ "StateMachine" ];
-  jsPlumb.Defaults.Overlays = [[ "Arrow", { length: 10, width:7, foldback:0.55, location:1 }]];
-
-
-  jsPlumb.Defaults.EndpointHoverStyle = {fillStyle: pinkish};
-  jsPlumb.Defaults.HoverPaintStyle = {lineWidth:2, strokeStyle: pinkish};
-
-
-  // set keyboard event listeners ...
-  // TODO: too global!
-  $(document).keydown(function(k) {
-    // ONLY capture keys if we're in 'visualize code' mode:
-    if (appMode == 'visualize' && !keyStuckDown) {
-      if (k.keyCode == 37) { // left arrow
-        if (curInstr > 0) {
-          // if there is a prev breakpoint, then jump to it ...
-          if (sortedBreakpointsList.length > 0) {
-            var prevBreakpoint = findPrevBreakpoint(curInstr);
-            if (prevBreakpoint != -1) {
-              curInstr = prevBreakpoint;
-            }
-            else {
-              curInstr -= 1; // prevent keyboard keys from "getting stuck" on a solitary breakpoint
-            }
-          }
-          else {
-            curInstr -= 1;
-          }
-          updateOutput();
-        }
-
-        k.preventDefault(); // don't horizontally scroll the display
-
-        keyStuckDown = true;
-      }
-      else if (k.keyCode == 39) { // right arrow
-        if (curInstr < curTrace.length - 1) {
-          // if there is a next breakpoint, then jump to it ...
-          if (sortedBreakpointsList.length > 0) {
-            var nextBreakpoint = findNextBreakpoint(curInstr);
-            if (nextBreakpoint != -1) {
-              curInstr = nextBreakpoint;
-            }
-            else {
-              curInstr += 1; // prevent keyboard keys from "getting stuck" on a solitary breakpoint
-            }
-          }
-          else {
-            curInstr += 1;
-          }
-          updateOutput();
-        }
-
-        k.preventDefault(); // don't horizontally scroll the display
-
-        keyStuckDown = true;
-      }
-    }
-  });
-
-  // TODO: too global!
-  $(document).keyup(function(k) {
-    keyStuckDown = false;
-  });
-
-
-  // redraw everything on window resize so that connectors are in the
-  // right place
-  // TODO: can be SLOW on older browsers!!!
-  // TODO: too global!
-  $(window).resize(function() {
-    if (appMode == 'visualize') {
-      updateOutput();
-    }
-  });
-
-  $("#classicModeCheckbox").click(function() {
-    if (appMode == 'visualize') {
-      updateOutput();
-    }
-  });
-}
-
-
-
 // Utilities
 
 
diff --git a/PyTutorGAE/tutor.html b/PyTutorGAE/tutor.html
index fab696160..b17645ab1 100644
--- a/PyTutorGAE/tutor.html
+++ b/PyTutorGAE/tutor.html
@@ -142,84 +142,9 @@
 

 
 
-

+

 
 
-
-
-
-
-
-
-

-
-

-
-

-

-
-

-
-
-
-

-
-

-  Use the left and right arrow keys to step through execution.
-  
Click on lines of code to set breakpoints.
-

-
-

-

-
-

-  
-  
-  Step ? of ?
-  
-  
-

-
-
-

-
-
-

-
-Program output:
-

-
-
-

- 
-

-
-
-		
-
-

-
-  
-    
-      
-      
-    
-  

-        

-          
Frames

-        

-      		
-        

-          
Objects

-        

-      

-
-

-
-

-
-
 
-
 
' + varname + '
');
-
-      var tbl = $(vizDiv + " #" + tableID);
-
-      $.each(frame.ordered_varnames, function(xxx, varname) {
-        var val = localVars[varname];
-
-        // don't render return values for zombie frames
-        if (is_zombie && varname == '__return__') {
-          return;
-        }
-
-        // special treatment for displaying return value and indicating
-        // that the function is about to return to its caller
-        //
-        // DON'T do this for zombie frames
-        if (varname == '__return__' && !is_zombie) {
-          assert(curEntry.event == 'return'); // sanity check
-
-          tbl.append('
About to return
Return value:
' + varname + '

-
-
-  
-
-
-
-
-
-
-

-    
-  

-
-

-
-

-
-

-
-
-
-

-
-
Use the slider or the left and right arrow keys to step through execution.
-
Click on code to set breakpoints.

-
-

-

-
-

-  
-  
-  Step ? of ?
-  
-  
-

-
-
-

-
-
-

-
-Program output:
-

-
-
-

- 
-

-
-
-		
-
-

-
-  
-    
-      
-      
-    
-  

-        

-          
Frames

-        

-      		
-        

-          
Objects

-        

-      

-
-

-
-

-
- 
-
-
-
-
-
-

From f7dd82f11f2294046058a2d282bb275618391e23 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 8 Aug 2012 16:07:56 -0700
Subject: [PATCH 064/502] moar MAJOR refactoringz

---
 PyTutorGAE/backend_test.py    | 15 --------------
 PyTutorGAE/js/opt-frontend.js | 20 +++++++++---------
 PyTutorGAE/js/pytutor.js      | 38 +++++++++++++++++++++--------------
 PyTutorGAE/pg_logger.py       |  6 +++++-
 PyTutorGAE/pythontutor.py     |  6 +++---
 5 files changed, 42 insertions(+), 43 deletions(-)
 delete mode 100644 PyTutorGAE/backend_test.py

diff --git a/PyTutorGAE/backend_test.py b/PyTutorGAE/backend_test.py
deleted file mode 100644
index 5e17a9912..000000000
--- a/PyTutorGAE/backend_test.py
+++ /dev/null
@@ -1,15 +0,0 @@
-import pg_logger, pprint, json
-
-pp = pprint.PrettyPrinter()
-
-def pprint_finalizer(trace):
-  for e in trace:
-    pp.pprint(e)
-
-
-def json_finalizer(output_lst):
-  json_output = json.dumps(output_lst, indent=None) # use indent=None for most compact repr
-  print json_output
-
-
-pg_logger.exec_script_str(open('example-code/towers_of_hanoi.txt').read(), json_finalizer)
diff --git a/PyTutorGAE/js/opt-frontend.js b/PyTutorGAE/js/opt-frontend.js
index ae11c754e..f3c02959b 100644
--- a/PyTutorGAE/js/opt-frontend.js
+++ b/PyTutorGAE/js/opt-frontend.js
@@ -136,14 +136,16 @@ $(document).ready(function() {
 
     $.get("exec",
           {user_script : pyInputCodeMirror.getValue()},
-          function(traceData) {
+          function(dataFromBackend) {
+            var trace = dataFromBackend.trace;
+            
             // don't enter visualize mode if there are killer errors:
-            if (!traceData ||
-                (traceData.length == 0) ||
-                ((traceData.length == 1) && traceData[0].event == 'uncaught_exception')) {
+            if (!trace ||
+                (trace.length == 0) ||
+                ((trace.length == 1) && trace[0].event == 'uncaught_exception')) {
 
-              if (traceData.length > 0) {
-                var errorLineNo = traceData[0].line - 1; /* CodeMirror lines are zero-indexed */
+              if (trace.length > 0) {
+                var errorLineNo = trace[0].line - 1; /* CodeMirror lines are zero-indexed */
                 if (errorLineNo !== undefined) {
                   // highlight the faulting line in pyInputCodeMirror
                   pyInputCodeMirror.focus();
@@ -156,7 +158,7 @@ $(document).ready(function() {
                   });
                 }
 
-                alert(traceData[0].exception_msg);
+                alert(trace[0].exception_msg);
               }
               else {
                 alert("Whoa, unknown error! Please reload and try again.");
@@ -169,12 +171,12 @@ $(document).ready(function() {
               var startingInstruction = 0;
 
               // only do this at most ONCE, and then clear out preseededCurInstr
-              if (preseededCurInstr && preseededCurInstr < traceData.length) { // NOP anyways if preseededCurInstr is 0
+              if (preseededCurInstr && preseededCurInstr < trace.length) { // NOP anyways if preseededCurInstr is 0
                 startingInstruction = preseededCurInstr;
                 preseededCurInstr = null;
               }
 
-              myVisualizer = new ExecutionVisualizer(pyInputCodeMirror.getValue(), traceData, startingInstruction, 'pyOutputPane');
+              myVisualizer = new ExecutionVisualizer(dataFromBackend, startingInstruction, 'pyOutputPane');
 
               $.bbq.pushState({ mode: 'visualize' }, 2 /* completely override other hash strings to keep URL clean */);
             }
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 24b95d64a..606db4546 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -29,10 +29,20 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 var curVisualizerID = 1; // global to uniquely identify each ExecutionVisualizer instance
 
-function ExecutionVisualizer(inputCode, traceData, startingInstruction, domRootID) {
-  this.curInputCode = inputCode;
-  this.curTrace = traceData;
-  this.curInstr = startingInstruction;
+// domRootID is the string ID of the root element where to render this instance
+// dat is data returned by the Python Tutor backend consisting of two fields:
+//   code  - string of executed code
+//   trace - a full execution trace 
+// startingInstruction is (optional) the execution point to display upon rendering (one-indexed)
+function ExecutionVisualizer(domRootID, dat, startingInstruction /* optional */) {
+  this.curInputCode = dat.code;
+  this.curTrace = dat.trace;
+
+  this.curInstr = 0;
+
+  if (startingInstruction) {
+    this.curInstr = (startingInstruction - 1); // zero-indexed
+  }
 
   this.visualizerID = curVisualizerID;
   curVisualizerID++;
@@ -1103,9 +1113,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   //        (the format is: '__heap_object_')
   //
   // The reason we need to prepend this.visualizerID is because jsPlumb needs
-  // GLOBALLY UNIQUE IDs for use as connector endpoints. Actually this is no
-  // longer true since we can use this.jsPlumbInstance, but still it's nice
-  // to have unique div IDs
+  // GLOBALLY UNIQUE IDs for use as connector endpoints.
   var connectionEndpointIDs = d3.map();
   var heapConnectionEndpointIDs = d3.map(); // subset of connectionEndpointIDs for heap->heap connections
 
@@ -1427,10 +1435,10 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   // render all global variables IN THE ORDER they were created by the program,
   // in order to ensure continuity:
   if (curEntry.ordered_globals.length > 0) {
-    this.domRoot.find("#stack").append('
Global variables
');
-    this.domRoot.find("#stack #globals").append('
');
+    this.domRoot.find("#stack").append('
Global variables
');
+    this.domRoot.find('#stack #' + myViz.visualizerID + '__globals').append('
');
 
-    var tbl = this.domRoot.find("#global_table");
+    var tbl = this.domRoot.find('#' + myViz.visualizerID + '__global_table');
 
     $.each(curEntry.ordered_globals, function(i, varname) {
       var val = curEntry.globals[varname];
@@ -1449,7 +1457,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
           // make sure varname doesn't contain any weird
           // characters that are illegal for CSS ID's ...
-          var varDivID = 'global__' + varnameToCssID(varname);
+          var varDivID = myViz.visualizerID + '__global__' + varnameToCssID(varname);
           curTr.find("td.stackFrameValue").append('
 
');
 
           assert(!connectionEndpointIDs.has(varDivID));
@@ -1483,12 +1491,12 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     var divClass, divID, headerDivID;
     if (is_zombie) {
       divClass = 'zombieStackFrame';
-      divID = "zombie_stack" + ind;
+      divID = myViz.visualizerID + "__zombie_stack" + ind;
       headerDivID = "zombie_stack_header" + ind;
     }
     else {
       divClass = 'stackFrame';
-      divID = "stack" + ind;
+      divID = myViz.visualizerID + "__stack" + ind;
       headerDivID = "stack_header" + ind;
     }
 
@@ -1605,13 +1613,13 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   var frame_already_highlighted = false;
   $.each(curEntry.stack_to_render, function(i, e) {
     if (e.is_highlighted) {
-      highlight_frame('stack' + i);
+      highlight_frame(myViz.visualizerID + '__stack' + i);
       frame_already_highlighted = true;
     }
   });
 
   if (!frame_already_highlighted) {
-    highlight_frame('globals');
+    highlight_frame(myViz.visualizerID + '__globals');
   }
 
 }
diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index f0cf5c67c..21dbc6889 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -110,6 +110,8 @@ def __init__(self, finalizer_func):
         # execution, or else canonical small IDs won't be consistent.
         self.encoder = pg_encoder.ObjectEncoder()
 
+        self.executed_script = None # Python script to be executed!
+
 
     # Returns the (lexical) parent frame of the function that was called
     # to create the stack frame 'frame'.
@@ -452,6 +454,8 @@ def create_encoded_stack_entry(cur_frame):
 
 
     def _runscript(self, script_str):
+        self.executed_script = script_str
+
         # When bdb sets tracing, a number of call and line events happens
         # BEFORE debugger even reaches user's code (and the exact sequence of
         # events depends on python version). So we take special measures to
@@ -542,7 +546,7 @@ def finalize(self):
 
       #for e in self.trace: print >> sys.stderr, e
 
-      self.finalizer_func(self.trace)
+      self.finalizer_func(self.executed_script, self.trace)
 
 
 
diff --git a/PyTutorGAE/pythontutor.py b/PyTutorGAE/pythontutor.py
index 1e1e1c132..89e0078dc 100644
--- a/PyTutorGAE/pythontutor.py
+++ b/PyTutorGAE/pythontutor.py
@@ -50,15 +50,15 @@ def get(self):
 
 class ExecScript(webapp2.RequestHandler):
 
-  def json_finalizer(self, output_lst):
-    json_output = json.dumps(output_lst, indent=None) # use indent=None for most compact repr
+  def json_finalizer(self, input_code, output_trace):
+    ret = dict(code=input_code, trace=output_trace)
+    json_output = json.dumps(ret, indent=None) # use indent=None for most compact repr
     self.response.out.write(json_output)
 
   def get(self):
     self.response.headers['Content-Type'] = 'application/json'
     self.response.headers['Cache-Control'] = 'no-cache'
     pg_logger.exec_script_str(self.request.get('user_script'), self.json_finalizer)
-    #pg_logger.exec_script_str(TEST_STR, self.json_finalizer)
 
 
 app = webapp2.WSGIApplication([('/', TutorPage),

From 1f2b3860e9d125f61baf70be2b2bd528dc70b5a5 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 8 Aug 2012 16:24:38 -0700
Subject: [PATCH 065/502] cleanups

---
 PyTutorGAE/js/pytutor.js | 42 ++++++++++++++++++++++++++--------------
 1 file changed, 27 insertions(+), 15 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 606db4546..4025fcc2d 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -44,6 +44,7 @@ function ExecutionVisualizer(domRootID, dat, startingInstruction /* optional */)
     this.curInstr = (startingInstruction - 1); // zero-indexed
   }
 
+  // needs to be unique!
   this.visualizerID = curVisualizerID;
   curVisualizerID++;
 
@@ -95,6 +96,13 @@ function ExecutionVisualizer(domRootID, dat, startingInstruction /* optional */)
 }
 
 
+// create a unique ID, which is often necessary so that jsPlumb doesn't get confused
+// due to multiple ExecutionVisualizer instances being displayed simultaneously
+ExecutionVisualizer.prototype.generateID = function(original_id) {
+  return this.visualizerID + '__' + original_id;
+}
+
+
 ExecutionVisualizer.prototype.render = function() {
   if (this.hasRendered) {
     alert('ERROR: You should only call render() ONCE on an ExecutionVisualizer object.');
@@ -1248,11 +1256,11 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       // IE needs this div to be NON-EMPTY in order to properly
       // render jsPlumb endpoints, so that's why we add an " "!
 
-      var srcDivID = myViz.visualizerID + '__heap_pointer_src_' + heap_pointer_src_id;
+      var srcDivID = myViz.generateID('heap_pointer_src_' + heap_pointer_src_id);
       heap_pointer_src_id++; // just make sure each source has a UNIQUE ID
       d3DomElement.append('
 
');
 
-      var dstDivID = myViz.visualizerID + '__heap_object_' + objID;
+      var dstDivID = myViz.generateID('heap_object_' + objID);
 
       assert(!connectionEndpointIDs.has(srcDivID));
       connectionEndpointIDs.set(srcDivID, dstDivID);
@@ -1264,7 +1272,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     }
 
 
-    var heapObjID = myViz.visualizerID + '__heap_object_' + objID;
+    var heapObjID = myViz.generateID('heap_object_' + objID);
 
 
     // wrap ALL compound objects in a heapObject div so that jsPlumb
@@ -1435,10 +1443,14 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   // render all global variables IN THE ORDER they were created by the program,
   // in order to ensure continuity:
   if (curEntry.ordered_globals.length > 0) {
-    this.domRoot.find("#stack").append('
Global variables
');
-    this.domRoot.find('#stack #' + myViz.visualizerID + '__globals').append('
');
 
-    var tbl = this.domRoot.find('#' + myViz.visualizerID + '__global_table');
+    var globalsID = myViz.generateID('globals');
+    var globalTblID = myViz.generateID('global_table');
+
+    this.domRoot.find("#stack").append('
Global variables
');
+    this.domRoot.find('#stack #' + globalsID).append('
');
+
+    var tbl = this.domRoot.find('#' + globalTblID);
 
     $.each(curEntry.ordered_globals, function(i, varname) {
       var val = curEntry.globals[varname];
@@ -1457,11 +1469,11 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
           // make sure varname doesn't contain any weird
           // characters that are illegal for CSS ID's ...
-          var varDivID = myViz.visualizerID + '__global__' + varnameToCssID(varname);
+          var varDivID = myViz.generateID('global__' + varnameToCssID(varname));
           curTr.find("td.stackFrameValue").append('
 
');
 
           assert(!connectionEndpointIDs.has(varDivID));
-          var heapObjID = myViz.visualizerID + '__heap_object_' + getRefID(val);
+          var heapObjID = myViz.generateID('heap_object_' + getRefID(val));
           connectionEndpointIDs.set(varDivID, heapObjID);
         }
       }
@@ -1491,13 +1503,13 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     var divClass, divID, headerDivID;
     if (is_zombie) {
       divClass = 'zombieStackFrame';
-      divID = myViz.visualizerID + "__zombie_stack" + ind;
-      headerDivID = "zombie_stack_header" + ind;
+      divID = myViz.generateID("zombie_stack" + ind);
+      headerDivID = myViz.generateID("zombie_stack_header" + ind);
     }
     else {
       divClass = 'stackFrame';
-      divID = myViz.visualizerID + "__stack" + ind;
-      headerDivID = "stack_header" + ind;
+      divID = myViz.generateID("stack" + ind);
+      headerDivID = myViz.generateID("stack_header" + ind);
     }
 
     myViz.domRoot.find("#stack").append('
');
@@ -1551,7 +1563,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
           assert(!connectionEndpointIDs.has(varDivID));
 
-          var heapObjID = myViz.visualizerID + '__heap_object_' + getRefID(val);
+          var heapObjID = myViz.generateID('heap_object_' + getRefID(val));
           connectionEndpointIDs.set(varDivID, heapObjID);
         }
       });
@@ -1613,13 +1625,13 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   var frame_already_highlighted = false;
   $.each(curEntry.stack_to_render, function(i, e) {
     if (e.is_highlighted) {
-      highlight_frame(myViz.visualizerID + '__stack' + i);
+      highlight_frame(myViz.generateID('stack' + i));
       frame_already_highlighted = true;
     }
   });
 
   if (!frame_already_highlighted) {
-    highlight_frame(myViz.visualizerID + '__globals');
+    highlight_frame(myViz.generateID('globals'));
   }
 
 }

From 6b1b22c9e4a0b52aabf5f7e65c0b9bb5e8f9be8a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 8 Aug 2012 16:41:45 -0700
Subject: [PATCH 066/502] almost there!

---
 PyTutorGAE/js/opt-frontend.js |  4 +++-
 PyTutorGAE/js/pytutor.js      | 28 ++++++++++++++++++----------
 2 files changed, 21 insertions(+), 11 deletions(-)

diff --git a/PyTutorGAE/js/opt-frontend.js b/PyTutorGAE/js/opt-frontend.js
index f3c02959b..2d3c52d28 100644
--- a/PyTutorGAE/js/opt-frontend.js
+++ b/PyTutorGAE/js/opt-frontend.js
@@ -176,7 +176,9 @@ $(document).ready(function() {
                 preseededCurInstr = null;
               }
 
-              myVisualizer = new ExecutionVisualizer(dataFromBackend, startingInstruction, 'pyOutputPane');
+              myVisualizer = new ExecutionVisualizer('pyOutputPane',
+                                                     dataFromBackend,
+                                                     {startingInstruction: startingInstruction});
 
               $.bbq.pushState({ mode: 'visualize' }, 2 /* completely override other hash strings to keep URL clean */);
             }
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 4025fcc2d..e5faf249b 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -33,16 +33,16 @@ var curVisualizerID = 1; // global to uniquely identify each ExecutionVisualizer
 // dat is data returned by the Python Tutor backend consisting of two fields:
 //   code  - string of executed code
 //   trace - a full execution trace 
-// startingInstruction is (optional) the execution point to display upon rendering (one-indexed)
-function ExecutionVisualizer(domRootID, dat, startingInstruction /* optional */) {
+// params contains optional parameters, such as:
+//   startingInstruction - the (one-indexed) execution point to display upon rendering
+//   hideOutput - hide "Program output" and "Generate URL" displays
+function ExecutionVisualizer(domRootID, dat, params) {
   this.curInputCode = dat.code;
   this.curTrace = dat.trace;
 
   this.curInstr = 0;
 
-  if (startingInstruction) {
-    this.curInstr = (startingInstruction - 1); // zero-indexed
-  }
+  this.params = params;
 
   // needs to be unique!
   this.visualizerID = curVisualizerID;
@@ -137,9 +137,11 @@ ExecutionVisualizer.prototype.render = function() {
           \
           
\
         \
+        
\
         Program output:
\
         \
         
 
\
+        
\
       
\
         
\
@@ -163,6 +165,9 @@ ExecutionVisualizer.prototype.render = function() {
   
');
 
 
+  if (this.params && this.params.hideOutput) {
+    this.domRoot.find('#progOutputs').hide();
+  }
 
   this.domRoot.find('#genUrlBtn').bind('click', function() {
     var urlStr = $.param.fragment(window.location.href,
@@ -222,11 +227,10 @@ ExecutionVisualizer.prototype.render = function() {
     this.curTrace.shift();
   }
 
-  var sliderDiv = this.domRoot.find('#executionSlider');
-
   // set up slider after postprocessing curTrace
-  sliderDiv.slider({min: 0, max: this.curTrace.length - 1, step: 1});
 
+  var sliderDiv = this.domRoot.find('#executionSlider');
+  sliderDiv.slider({min: 0, max: this.curTrace.length - 1, step: 1});
   //disable keyboard actions on the slider itself (to prevent double-firing of events)
   sliderDiv.find(".ui-slider-handle").unbind('keydown');
   // make skinnier and taller
@@ -246,6 +250,12 @@ ExecutionVisualizer.prototype.render = function() {
   });
 
 
+  if (this.params && this.params.startingInstruction) {
+    assert(1 <= this.params.startingInstruction &&
+           this.params.startingInstruction <= this.curTrace.length);
+    this.curInstr = (this.params.startingInstruction - 1); // convert to zero-indexed
+  }
+
 
   this.setKeyboardBindings();
 
@@ -627,8 +637,6 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
 ExecutionVisualizer.prototype.updateOutput = function() {
   var myViz = this; // to prevent confusion of 'this' inside of nested functions
 
-  this.domRoot.find('td#left_pane').focus(); // to start accepting keyboard inputs
-
   assert(this.curTrace);
 
   this.domRoot.find('#urlOutput').val(''); // blank out

From 98e46716f8e2581c2731e957b85aedd0d854dd57 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 8 Aug 2012 16:46:18 -0700
Subject: [PATCH 067/502] embedding almost done, i think!

---
 PyTutorGAE/embedding-examples.js | 19 ++++++++++++++
 PyTutorGAE/embedding-test.html   | 45 ++++++++++++++++++++++++++++++++
 PyTutorGAE/js/pytutor.js         |  5 ++++
 3 files changed, 69 insertions(+)
 create mode 100644 PyTutorGAE/embedding-examples.js
 create mode 100644 PyTutorGAE/embedding-test.html

diff --git a/PyTutorGAE/embedding-examples.js b/PyTutorGAE/embedding-examples.js
new file mode 100644
index 000000000..5476cdd12
--- /dev/null
+++ b/PyTutorGAE/embedding-examples.js
@@ -0,0 +1,19 @@
+// Traces generated by generate_json_trace.py
+
+var aliasing = {"code": "# Example of aliasing\nx = [1, 2, 3]\ny = x\nx.append(4)\ny.append(5)\nz = [1, 2, 3, 4, 5]\nx.append(6)\ny.append(7)\ny = \"hello\"\n\ndef foo(lst): # breakpoint\n    lst.append(\"hello\")\n    bar(lst)\n\ndef bar(myLst): # breakpoint\n    print myLst\n\nfoo(x)\nfoo(z)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"x": ["REF", 1]}, "heap": {"1": ["LIST", 1, 2, 3]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["x", "y"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": ["REF", 1], "x": ["REF", 1]}, "heap": {"1": ["LIST", 1, 2, 3]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["x", "y"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": ["REF", 1], "x": ["REF", 1]}, "heap": {"1": ["LIST", 1, 2, 3, 4]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["x", "y"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": ["REF", 1], "x": ["REF", 1]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5]}, "line": 6, "event": "step_line"}, {"ordered_globals": ["x", "y", "z"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": ["REF", 1], "x": ["REF", 1], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5], "2": ["LIST", 1, 2, 3, 4, 5]}, "line": 7, "event": "step_line"}, {"ordered_globals": ["x", "y", "z"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": ["REF", 1], "x": ["REF", 1], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6], "2": ["LIST", 1, 2, 3, 4, 5]}, "line": 8, "event": "step_line"}, {"ordered_globals": ["x", "y", "z"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": ["REF", 1], "x": ["REF", 1], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7], "2": ["LIST", 1, 2, 3, 4, 5]}, "line": 9, "event": "step_line"}, {"ordered_globals": ["x", "y", "z"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": "hello", "x": ["REF", 1], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7], "2": ["LIST", 1, 2, 3, 4, 5]}, "line": 11, "event": "step_line"}, {"ordered_globals": ["x", "y", "z", "foo"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null]}, "line": 15, "event": "step_line"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 18, "event": "step_line"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "", "func_name": "foo", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 1]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 11, "event": "call"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "", "func_name": "foo", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 1]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 12, "event": "step_line"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "", "func_name": "foo", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 1]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 13, "event": "step_line"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "", "func_name": "bar", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 1]}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "bar", "is_zombie": false, "ordered_varnames": ["myLst"], "frame_id": null, "encoded_locals": {"myLst": ["REF", 1]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 15, "event": "call"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "", "func_name": "bar", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 1]}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "bar", "is_zombie": false, "ordered_varnames": ["myLst"], "frame_id": null, "encoded_locals": {"myLst": ["REF", 1]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 16, "event": "step_line"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n", "func_name": "bar", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 1]}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "bar", "is_zombie": false, "ordered_varnames": ["myLst", "__return__"], "frame_id": null, "encoded_locals": {"__return__": null, "myLst": ["REF", 1]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 16, "event": "return"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n", "func_name": "foo", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst", "__return__"], "frame_id": null, "encoded_locals": {"__return__": null, "lst": ["REF", 1]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 13, "event": "return"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n", "func_name": "", "stack_to_render": [], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 19, "event": "step_line"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n", "func_name": "foo", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 2]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 11, "event": "call"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n", "func_name": "foo", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 2]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 12, "event": "step_line"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n", "func_name": "foo", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 2]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5, "hello"], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 13, "event": "step_line"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n", "func_name": "bar", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 2]}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "bar", "is_zombie": false, "ordered_varnames": ["myLst"], "frame_id": null, "encoded_locals": {"myLst": ["REF", 2]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5, "hello"], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 15, "event": "call"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n", "func_name": "bar", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 2]}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "bar", "is_zombie": false, "ordered_varnames": ["myLst"], "frame_id": null, "encoded_locals": {"myLst": ["REF", 2]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5, "hello"], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 16, "event": "step_line"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n[1, 2, 3, 4, 5, 'hello']\n", "func_name": "bar", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 2]}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "bar", "is_zombie": false, "ordered_varnames": ["myLst", "__return__"], "frame_id": null, "encoded_locals": {"__return__": null, "myLst": ["REF", 2]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5, "hello"], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 16, "event": "return"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n[1, 2, 3, 4, 5, 'hello']\n", "func_name": "foo", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst", "__return__"], "frame_id": null, "encoded_locals": {"__return__": null, "lst": ["REF", 2]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5, "hello"], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 13, "event": "return"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n[1, 2, 3, 4, 5, 'hello']\n", "func_name": "", "stack_to_render": [], "globals": {"y": "hello", "x": ["REF", 1], "z": ["REF", 2], "bar": ["REF", 4], "foo": ["REF", 3]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5, "hello"], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 19, "event": "return"}]};
+
+var aliasing5 = {"code": "x = None\nfor i in range(5, 0, -1):\n  x = (i, x)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 1, "event": "step_line"}, {"ordered_globals": ["x"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"x": null}, "heap": {}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 5, "x": null}, "heap": {}, "line": 3, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 5, "x": ["REF", 1]}, "heap": {"1": ["TUPLE", 5, null]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 4, "x": ["REF", 1]}, "heap": {"1": ["TUPLE", 5, null]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 4, "x": ["REF", 2]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 3, "x": ["REF", 2]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 3, "x": ["REF", 3]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 2, "x": ["REF", 3]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 2, "x": ["REF", 4]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]], "4": ["TUPLE", 2, ["REF", 3]]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 1, "x": ["REF", 4]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]], "4": ["TUPLE", 2, ["REF", 3]]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 1, "x": ["REF", 5]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]], "4": ["TUPLE", 2, ["REF", 3]], "5": ["TUPLE", 1, ["REF", 4]]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 1, "x": ["REF", 5]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]], "4": ["TUPLE", 2, ["REF", 3]], "5": ["TUPLE", 1, ["REF", 4]]}, "line": 2, "event": "return"}]};
+
+var hanoi = {"code": "# move a stack of n disks from stack a to stack b,\n# using tmp as a temporary stack\ndef TowerOfHanoi(n, a, b, tmp):\n    if n == 1:\n        b.append(a.pop())\n    else:\n        TowerOfHanoi(n-1, a, tmp, b)\n        b.append(a.pop())\n        TowerOfHanoi(n-1, tmp, b, a)\n        \nstack1 = [4,3,2,1]\nstack2 = []\nstack3 = []\n      \n# transfer stack1 to stack3 using Tower of Hanoi rules\nTowerOfHanoi(len(stack1), stack1, stack3, stack2)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 3, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"TowerOfHanoi": ["REF", 1]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null]}, "line": 11, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1]}, "line": 12, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"]}, "line": 13, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 16, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 3, "event": "call"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 7, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, 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"b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 4], "a": ["REF", 2], "b": ["REF", 3], "n": 3}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", 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"TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 2, 1], "3": ["LIST"], "4": ["LIST", 4, 3]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 4], "a": ["REF", 2], "b": ["REF", 3], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 2, 1], "3": ["LIST"], "4": ["LIST", 4, 3]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 4], "a": ["REF", 2], "__return__": null, "b": ["REF", 3], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 2], "3": ["LIST", 1], "4": ["LIST", 4, 3]}, "line": 5, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 2], "3": ["LIST", 1], "4": ["LIST", 4, 3]}, "line": 8, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST", 1], "4": ["LIST", 4, 3, 2]}, "line": 9, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST", 1], "4": ["LIST", 4, 3, 2]}, "line": 3, "event": "call"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST", 1], "4": ["LIST", 4, 3, 2]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST", 1], "4": ["LIST", 4, 3, 2]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "__return__": null, "b": ["REF", 4], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 5, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "__return__": null, "b": ["REF", 4], "n": 2}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 9, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "__return__": null, "b": ["REF", 4], "n": 3}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 9, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "__return__": null, "b": ["REF", 4], "n": 4}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 9, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 16, "event": "return"}]};
+
+
+var aliasingViz = null;
+var aliasing5Viz = null;
+var hanoiViz = null;
+
+$(document).ready(function() {
+  aliasingViz = new ExecutionVisualizer('aliasingDiv', aliasing, {hideOutput: true, codeDivHeight: 150});
+  aliasing5Viz = new ExecutionVisualizer('aliasing5Div', aliasing5, {hideOutput: true});
+  hanoiViz = new ExecutionVisualizer('hanoiDiv', hanoi, {startingInstruction: 45, hideOutput: true});
+});
+
diff --git a/PyTutorGAE/embedding-test.html b/PyTutorGAE/embedding-test.html
new file mode 100644
index 000000000..1a90ad607
--- /dev/null
+++ b/PyTutorGAE/embedding-test.html
@@ -0,0 +1,45 @@
+
+
+
+
+  Online Python Tutor embedding test
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
Aliasing:

+
+

+
+
Aliasing 5:

+
+

+
+
Towers of Hanoi:

+
+

+
+
+
+
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index e5faf249b..e4b4b25bb 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -36,6 +36,7 @@ var curVisualizerID = 1; // global to uniquely identify each ExecutionVisualizer
 // params contains optional parameters, such as:
 //   startingInstruction - the (one-indexed) execution point to display upon rendering
 //   hideOutput - hide "Program output" and "Generate URL" displays
+//   codeDivHeight - maximum height of #pyCodeOutputDiv (in pixels)
 function ExecutionVisualizer(domRootID, dat, params) {
   this.curInputCode = dat.code;
   this.curTrace = dat.trace;
@@ -164,6 +165,10 @@ ExecutionVisualizer.prototype.render = function() {
     \
   ');
 
+  if (this.params && this.params.codeDivHeight) {
+    this.domRoot.find('#pyCodeOutputDiv').css('max-height', this.params.codeDivHeight);
+  }
+
 
   if (this.params && this.params.hideOutput) {
     this.domRoot.find('#progOutputs').hide();

From 7593843e3be477e908ee6c9d6063b6b45a3b3c45 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 8 Aug 2012 16:47:29 -0700
Subject: [PATCH 068/502] added

---
 PyTutorGAE/generate_json_trace.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 PyTutorGAE/generate_json_trace.py

diff --git a/PyTutorGAE/generate_json_trace.py b/PyTutorGAE/generate_json_trace.py
new file mode 100644
index 000000000..e973bc4a4
--- /dev/null
+++ b/PyTutorGAE/generate_json_trace.py
@@ -0,0 +1,13 @@
+# Generates a JSON trace that is compatible with the js/pytutor.js frontend
+
+import sys, pg_logger, json
+
+
+def json_finalizer(input_code, output_trace):
+  ret = dict(code=input_code, trace=output_trace)
+  json_output = json.dumps(ret, indent=None) # use indent=None for most compact repr
+  print json_output
+
+
+pg_logger.exec_script_str(open(sys.argv[1]).read(), json_finalizer)
+

From 036d49aa37ee845b7d8229b5b13b10165a5e780a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 8 Aug 2012 18:54:10 -0700
Subject: [PATCH 069/502] integrated most (but not all) of denero's patches for
 porting to Python 3
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

parts that remain unintegrated since they led to weird crashes in Python 2.7

diff --git a/PyTutorGAE/pg_encoder.py b/PyTutorGAE/pg_encoder.py
index 0445ae0..23c7b0d 100644
--- a/PyTutorGAE/pg_encoder.py
+++ b/PyTutorGAE/pg_encoder.py
@@ -50,11 +50,11 @@

 import re, types
-typeRE = re.compile("")
-classRE = re.compile("")
-
 import inspect

@@ -122,36 +120,22 @@ class ObjectEncoder:
-
-      elif typ in (types.InstanceType, types.ClassType, types.TypeType) or \
-           classRE.match(str(typ)):
-        # ugh, classRE match is a bit of a hack :(
-        if typ == types.InstanceType or classRE.match(str(typ)):
-          new_obj.extend(['INSTANCE', dat.__class__.__name__])
-        else:
-          superclass_names = [e.__name__ for e in dat.__bases__]
-          new_obj.extend(['CLASS', dat.__name__, superclass_names])
-
-        # traverse inside of its __dict__ to grab attributes
-        # (filter out useless-seeming ones):
-        user_attrs = sorted([e for e in dat.__dict__.keys() 
-                             if e not in ('__doc__', '__module__', '__return__')])
-
-        for attr in user_attrs:
-          new_obj.append([self.encode(attr), self.encode(dat.__dict__[attr])])
       elif typ in (types.FunctionType, types.MethodType):
         # NB: In Python 3.0, getargspec is deprecated in favor of getfullargspec
         argspec = inspect.getargspec(dat)
@@ -162,13 +146,25 @@ class ObjectEncoder:
         new_obj.extend(['FUNCTION', pretty_name, None]) # the final element will be filled in later
       else:
-        typeStr = str(typ)
-        m = typeRE.match(typeStr)
-        assert m, typ
-        new_obj.extend([m.group(1), str(dat)])
+        if isinstance(dat, type):
+          superclass_names = [get_name(e) for e in dat.__bases__ if e is not object]
+          new_obj.extend(['CLASS', get_name(dat), superclass_names])
+        else:
+          new_obj.extend(['INSTANCE', dat.__class__.__name__])

-      return ret
+        # traverse inside of its __dict__ to grab attributes
+        # (filter out useless-seeming ones):
+        hidden = ('__doc__', '__module__', '__return__', '__dict__',
+            '__locals__', '__weakref__')
+        if hasattr(dat, '__dict__'):
+          user_attrs = sorted([e for e in dat.__dict__ if e not in hidden])
+        else:
+            user_attrs = []
+
+        for attr in user_attrs:
+          new_obj.append([self.encode(attr), self.encode(dat.__dict__[attr])])

+      return ret
diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index f0cf5c6..a497aa9 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -36,7 +36,7 @@ import re
 import traceback
 import types

-import cStringIO
+import io
 import pg_encoder

@@ -477,7 +491,7 @@ class PGLogger(bdb.Bdb):
         '''

-        user_stdout = cStringIO.StringIO()
+        user_stdout = io.StringIO()

         sys.stdout = user_stdout
         user_globals = {"__name__"    : "__main__",
---
 PyTutorGAE/pg_encoder.py | 30 ++++++++++++++++++------------
 PyTutorGAE/pg_logger.py  | 38 ++++++++++++++++++++++++--------------
 2 files changed, 42 insertions(+), 26 deletions(-)

diff --git a/PyTutorGAE/pg_encoder.py b/PyTutorGAE/pg_encoder.py
index 0445ae03c..75c47b608 100644
--- a/PyTutorGAE/pg_encoder.py
+++ b/PyTutorGAE/pg_encoder.py
@@ -1,8 +1,8 @@
 # Online Python Tutor
 # https://github.com/pgbovine/OnlinePythonTutor/
-# 
+#
 # Copyright (C) 2010-2012 Philip J. Guo (philip@pgbovine.net)
-# 
+#
 # Permission is hereby granted, free of charge, to any person obtaining a
 # copy of this software and associated documentation files (the
 # "Software"), to deal in the Software without restriction, including
@@ -10,10 +10,10 @@
 # distribute, sublicense, and/or sell copies of the Software, and to
 # permit persons to whom the Software is furnished to do so, subject to
 # the following conditions:
-# 
+#
 # The above copyright notice and this permission notice shall be included
 # in all copies or substantial portions of the Software.
-# 
+#
 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
@@ -55,6 +55,10 @@
 
 import inspect
 
+def get_name(obj):
+  """Return the name of an object."""
+  return obj.__name__ if hasattr(obj, '__name__') else get_name(type(obj))
+
 
 # Note that this might BLOAT MEMORY CONSUMPTION since we're holding on
 # to every reference ever created by the program without ever releasing
@@ -90,8 +94,7 @@ def set_function_parent_frame_ID(self, ref_obj, enclosing_frame_id):
   # and as a side effect, update encoded_heap_objects
   def encode(self, dat):
     # primitive type
-    if dat is None or \
-       type(dat) in (int, long, float, str, bool):
+    if type(dat) in (int, float, str, bool, type(None)):
       return dat
 
     # compound type - return an object reference and update encoded_heap_objects
@@ -122,18 +125,21 @@ def encode(self, dat):
 
       if typ == list:
         new_obj.append('LIST')
-        for e in dat: new_obj.append(self.encode(e))
+        for e in dat:
+          new_obj.append(self.encode(e))
       elif typ == tuple:
         new_obj.append('TUPLE')
-        for e in dat: new_obj.append(self.encode(e))
+        for e in dat:
+          new_obj.append(self.encode(e))
       elif typ == set:
         new_obj.append('SET')
-        for e in dat: new_obj.append(self.encode(e))
+        for e in dat:
+          new_obj.append(self.encode(e))
       elif typ == dict:
         new_obj.append('DICT')
-        for (k, v) in dat.iteritems():
+        for (k, v) in dat.items():
           # don't display some built-in locals ...
-          if k not in ('__module__', '__return__'):
+          if k not in ('__module__', '__return__', '__locals__'):
             new_obj.append([self.encode(k), self.encode(v)])
 
       elif typ in (types.InstanceType, types.ClassType, types.TypeType) or \
@@ -162,7 +168,7 @@ def encode(self, dat):
         if argspec.keywords:
           printed_args.extend(['**' + e for e in argspec.keywords])
 
-        pretty_name = dat.__name__ + '(' + ', '.join(printed_args) + ')'
+        pretty_name = get_name(dat) + '(' + ', '.join(printed_args) + ')'
         new_obj.extend(['FUNCTION', pretty_name, None]) # the final element will be filled in later
       else:
         typeStr = str(typ)
diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index 21dbc6889..84988b929 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -1,8 +1,8 @@
 # Online Python Tutor
 # https://github.com/pgbovine/OnlinePythonTutor/
-# 
+#
 # Copyright (C) 2010-2012 Philip J. Guo (philip@pgbovine.net)
-# 
+#
 # Permission is hereby granted, free of charge, to any person obtaining a
 # copy of this software and associated documentation files (the
 # "Software"), to deal in the Software without restriction, including
@@ -10,7 +10,7 @@
 # distribute, sublicense, and/or sell copies of the Software, and to
 # permit persons to whom the Software is furnished to do so, subject to
 # the following conditions:
-# 
+#
 # The above copyright notice and this permission notice shall be included
 # in all copies or substantial portions of the Software.
 # 
@@ -67,7 +67,7 @@ def get_user_locals(frame):
 
 def filter_var_dict(d):
   ret = {}
-  for (k,v) in d.iteritems():
+  for (k,v) in d.items():
     if k not in IGNORE_VARS:
       ret[k] = v
   return ret
@@ -94,7 +94,7 @@ def __init__(self, finalizer_func):
         # Key:   function object
         # Value: parent frame
         self.closures = {}
-                 
+
         # List of frames to KEEP AROUND after the function exits,
         # because nested functions were defined in those frames.
         # ORDER matters for aesthetics.
@@ -125,7 +125,8 @@ def __init__(self, finalizer_func):
     # to make an educated guess based on the contents of local
     # variables inherited from possible parent frame candidates.
     def get_parent_frame(self, frame):
-      for (func_obj, parent_frame) in self.closures.iteritems():
+      # TODO(denero) Is this true in Python 3?!?
+      for (func_obj, parent_frame) in self.closures.items():
         # ok, there's a possible match, but let's compare the
         # local variables in parent_frame to those of frame
         # to make sure. this is a hack that happens to work because in
@@ -138,7 +139,7 @@ def get_parent_frame(self, frame):
               if parent_frame.f_locals[k] != frame.f_locals[k]:
                 all_matched = False
                 break
-          
+
           if all_matched:
             return parent_frame
 
@@ -191,7 +192,7 @@ def user_call(self, frame, argument_list):
     def user_line(self, frame):
         """This function is called when we stop or break at this line."""
         if self._wait_for_mainpyfile:
-            if (self.canonic(frame.f_code.co_filename) != "" or 
+            if (self.canonic(frame.f_code.co_filename) != "" or
                 frame.f_lineno <= 0):
                 return
             self._wait_for_mainpyfile = 0
@@ -267,7 +268,7 @@ def create_encoded_stack_entry(cur_frame):
           # effects of aliasing later down the line ...
           encoded_locals = {}
 
-          for (k, v) in get_user_locals(cur_frame).iteritems():
+          for (k, v) in get_user_locals(cur_frame).items():
             is_in_parent_frame = False
 
             # don't display locals that appear in your parents' stack frames,
@@ -275,7 +276,8 @@ def create_encoded_stack_entry(cur_frame):
             for pid in parent_frame_id_list:
               parent_frame = self.lookup_zombie_frame_by_id(pid)
               if k in parent_frame.f_locals:
-                # ignore __return__
+                # TODO(denero) Check Python3
+                # ignore __return__, which is never copied
                 if k != '__return__':
                   # these values SHOULD BE ALIASES
                   # (don't do an 'is' check since it might not fire for primitives)
@@ -292,6 +294,7 @@ def create_encoded_stack_entry(cur_frame):
             encoded_val = self.encoder.encode(v)
 
             # UGH, this is SUPER ugly but needed for nested function defs
+            # TODO(denero) Is this true in Python 3?!?
             if type(v) in (types.FunctionType, types.MethodType):
               try:
                 enclosing_frame = self.closures[v]
@@ -323,6 +326,13 @@ def create_encoded_stack_entry(cur_frame):
           if '__return__' in encoded_locals:
             ordered_varnames.append('__return__')
 
+          # doctor Python 3 initializer to look like a normal function (denero)
+          if '__locals__' in encoded_locals:
+            ordered_varnames.remove('__locals__')
+            local = encoded_locals.pop('__locals__')
+            if encoded_locals.get('__return__', True) is None:
+              encoded_locals['__return__'] = local
+
           # crucial sanity checks!
           assert len(ordered_varnames) == len(encoded_locals)
           for e in ordered_varnames:
@@ -340,7 +350,7 @@ def create_encoded_stack_entry(cur_frame):
         # look for whether a nested function has been defined during
         # this particular call:
         if i > 1: # i == 1 implies that there's only a global scope visible
-          for (k, v) in get_user_locals(top_frame).iteritems():
+          for (k, v) in get_user_locals(top_frame).items():
             if (type(v) in (types.FunctionType, types.MethodType) and \
                 v not in self.closures):
               self.closures[v] = top_frame
@@ -364,7 +374,7 @@ def create_encoded_stack_entry(cur_frame):
         # encode in a JSON-friendly format now, in order to prevent ill
         # effects of aliasing later down the line ...
         encoded_globals = {}
-        for (k, v) in get_user_globals(tos[0]).iteritems():
+        for (k, v) in get_user_globals(tos[0]).items():
           encoded_val = self.encoder.encode(v)
 
           # UGH, this is SUPER ugly but needed for nested function defs
@@ -471,9 +481,9 @@ def _runscript(self, script_str):
         # allowing certain potentially dangerous operations:
         user_builtins = {}
         for (k,v) in __builtins__.iteritems():
-          if k in ('reload', 'input', 'apply', 'open', 'compile', 
+          if k in ('reload', 'input', 'apply', 'open', 'compile',
                    '__import__', 'file', 'eval', 'execfile',
-                   'exit', 'quit', 'raw_input', 
+                   'exit', 'quit', 'raw_input',
                    'dir', 'globals', 'locals', 'vars',
                    'compile'):
             continue

From a8ae994f29f9bcb19d674b7f7d9484a7c057e813 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 8 Aug 2012 19:02:30 -0700
Subject: [PATCH 070/502] python 2 still has 'long' type, so put it back in

---
 PyTutorGAE/pg_encoder.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/PyTutorGAE/pg_encoder.py b/PyTutorGAE/pg_encoder.py
index 75c47b608..b15e10d19 100644
--- a/PyTutorGAE/pg_encoder.py
+++ b/PyTutorGAE/pg_encoder.py
@@ -94,7 +94,7 @@ def set_function_parent_frame_ID(self, ref_obj, enclosing_frame_id):
   # and as a side effect, update encoded_heap_objects
   def encode(self, dat):
     # primitive type
-    if type(dat) in (int, float, str, bool, type(None)):
+    if type(dat) in (int, long, float, str, bool, type(None)):
       return dat
 
     # compound type - return an object reference and update encoded_heap_objects

From 46bb7896bc0e7cd43dfa6289933ed0c57395871f Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 8 Aug 2012 19:05:46 -0700
Subject: [PATCH 071/502] tiny change to grab kb focus right away

---
 PyTutorGAE/js/opt-frontend.js | 3 +++
 PyTutorGAE/js/pytutor.js      | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/PyTutorGAE/js/opt-frontend.js b/PyTutorGAE/js/opt-frontend.js
index 2d3c52d28..551ed34f4 100644
--- a/PyTutorGAE/js/opt-frontend.js
+++ b/PyTutorGAE/js/opt-frontend.js
@@ -109,6 +109,9 @@ $(document).ready(function() {
       // jsPlumb connectors won't render properly
       myVisualizer.updateOutput();
 
+      // grab focus so that keyboard events work
+      myVisualizer.grabKeyboardFocus();
+
       // customize edit button click functionality AFTER rendering (TODO: awkward!)
       $('#pyOutputPane #editBtn').click(function() {
         enterEditMode();
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index e4b4b25bb..c20a65c64 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -395,6 +395,11 @@ ExecutionVisualizer.prototype.setKeyboardBindings = function() {
 }
 
 
+ExecutionVisualizer.prototype.grabKeyboardFocus = function() {
+  this.domRoot.find('td#left_pane').focus();
+}
+
+
 ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
   var myViz = this; // to prevent confusion of 'this' inside of nested functions
 

From 461f9a0a993844d83edb73ed669cd442b60407d5 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 8 Aug 2012 22:59:35 -0700
Subject: [PATCH 072/502] start refactoring globals frame to use d3

---
 PyTutorGAE/js/pytutor.js | 137 +++++++++++++++++++++++++++------------
 1 file changed, 95 insertions(+), 42 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index c20a65c64..cd067f4c1 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -100,7 +100,8 @@ function ExecutionVisualizer(domRootID, dat, params) {
 // create a unique ID, which is often necessary so that jsPlumb doesn't get confused
 // due to multiple ExecutionVisualizer instances being displayed simultaneously
 ExecutionVisualizer.prototype.generateID = function(original_id) {
-  return this.visualizerID + '__' + original_id;
+  // (it's safer to start names with a letter rather than a number)
+  return 'v' + this.visualizerID + '__' + original_id;
 }
 
 
@@ -165,6 +166,14 @@ ExecutionVisualizer.prototype.render = function() {
     \
   ');
 
+
+  // create a persistent globals frame
+  this.domRoot.find("#stack").append('
Global variables
');
+
+
   if (this.params && this.params.codeDivHeight) {
     this.domRoot.find('#pyCodeOutputDiv').css('max-height', this.params.codeDivHeight);
   }
@@ -592,17 +601,12 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
     .data(this.codeOutputLines)
     .enter().append('tr')
     .selectAll('td')
-    .data(function(e, i){return [e, e];}) // bind an alias of the element to both table columns
+    .data(function(d, i){return [d, d] /* map full data item down both columns */;})
     .enter().append('td')
     .attr('class', function(d, i) {return (i == 0) ? 'lineNo' : 'cod';})
     .style('cursor', function(d, i) {return 'pointer'})
     .html(function(d, i) {
-      if (i == 0) {
-        return d.lineNumber;
-      }
-      else {
-        return htmlspecialchars(d.text);
-      }
+      return (i == 0) ? d.lineNumber : htmlspecialchars(d.text);
     })
     .on('mouseover', function() {
       setHoverBreakpoint(this);
@@ -1123,11 +1127,6 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   var curEntry = this.curTrace[this.curInstr];
   var curToplevelLayout = this.curTraceLayouts[this.curInstr];
 
-  // clear the stack and render it from scratch.
-  // the heap must be PERSISTENT so that d3 can render heap transitions.
-  this.domRoot.find("#stack").empty();
-  this.domRoot.find("#stack").append('
Frames
');
-
 
   // Heap object rendering phase:
 
@@ -1164,7 +1163,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .selectAll('table.heapRow')
     .data(curToplevelLayout, function(objLst) {
       return objLst[0]; // return first element, which is the row ID tag
-  })
+  });
 
 
   // update an existing heap row
@@ -1172,12 +1171,12 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     //.each(function(objLst, i) { console.log('UPDATE ROW:', objLst, i); })
     .selectAll('td')
     .data(function(d, i) {return d.slice(1, d.length);}, /* map over each row, skipping row ID tag */
-          function(objID) {return objID;} /* each object ID is unique for constancy */)
+          function(objID) {return objID;} /* each object ID is unique for constancy */);
 
   // ENTER
   heapColumns.enter().append('td')
     .attr('class', 'toplevelHeapObject')
-    .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;})
+    .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;});
     // remember that the enter selection is added to the update
     // selection so that we can process it later ...
 
@@ -1191,11 +1190,11 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       // Right now, just delete the old element and render a new one in its place
       $(this).empty();
       renderCompoundObject(objID, $(this), true);
-    })
+    });
 
   // EXIT
   heapColumns.exit()
-    .remove()
+    .remove();
 
 
   // insert new heap rows
@@ -1450,37 +1449,78 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   }
 
 
-  // Render globals and then stack frames:
-  // TODO: could convert to using d3 to map globals and stack frames directly into stack frame divs
-  // (which might make it easier to do smooth transitions)
-  // However, I need to think carefully about what to use as object keys for stack objects.
-  // Perhaps a combination of function name and current position index? This might handle
-  // recursive calls well (i.e., when there are multiple invocations of the same function
-  // on the stack)
+  // Render globals and then stack frames using d3:
+
+  // TODO: However, I need to think carefully about what to use as
+  // object keys for stack objects.  Perhaps a combination of function
+  // name and current position index? This might handle recursive calls
+  // well (i.e., when there are multiple invocations of the same
+  // function on the stack)
+
 
   // render all global variables IN THE ORDER they were created by the program,
   // in order to ensure continuity:
-  if (curEntry.ordered_globals.length > 0) {
 
-    var globalsID = myViz.generateID('globals');
-    var globalTblID = myViz.generateID('global_table');
+  // Derive a list where each element contains a pair of
+  // [varname, value] as long as value is NOT undefined.
+  // (Sometimes entries in curEntry.ordered_globals are undefined,
+  // so filter those out.)
+  var realGlobalsLst = [];
+  $.each(curEntry.ordered_globals, function(i, varname) {
+    var val = curEntry.globals[varname];
+
+    // (use '!==' to do an EXACT match against undefined)
+    if (val !== undefined) { // might not be defined at this line, which is OKAY!
+      realGlobalsLst.push([varname, varname]); /* purposely map varname down both columns */
+    }
+  });
 
-    this.domRoot.find("#stack").append('
Global variables
');
-    this.domRoot.find('#stack #' + globalsID).append('
');
+  var globalsID = myViz.generateID('globals');
+  var globalTblID = myViz.generateID('global_table');
 
-    var tbl = this.domRoot.find('#' + globalTblID);
+  var globalsD3 = myViz.domRootD3.select('#' + globalTblID)
+    .selectAll('tr')
+    .data(realGlobalsLst, function(d) {
+      return d[0]; // use variable name as key
+    });
+    
 
-    $.each(curEntry.ordered_globals, function(i, varname) {
-      var val = curEntry.globals[varname];
-      // (use '!==' to do an EXACT match against undefined)
-      if (val !== undefined) { // might not be defined at this line, which is OKAY!
-        tbl.append('' + varname + '');
-        var curTr = tbl.find('tr:last');
+  // ENTER
+  globalsD3.enter()
+    .append('tr')
+    .selectAll('td')
+    .data(function(d, i){return d;}) /* map varname down both columns */
+    .enter()
+    .append('td')
+    .attr('class', function(d, i) {return (i == 0) ? 'stackFrameVar' : 'stackFrameValue';})
+    .html(function(d, i) {
+      return (i == 0) ? d : '' /* initialize in each() later */;
+    })
+  // remember that the enter selection is added to the update
+  // selection so that we can process it later ...
+
+  // UPDATE
+  globalsD3
+    .order() // VERY IMPORTANT to put in the order corresponding to data elements
+    .selectAll('td')
+    .data(function(d, i){return d;}) /* map varname down both columns */
+    .each(function(varname, i) {
+      console.log('EACH!', i, varname);
+
+      if (i == 1) {
+        var val = curEntry.globals[varname];
 
         if (isPrimitiveType(val)) {
-          renderPrimitiveObject(val, curTr.find("td.stackFrameValue"));
+          $(this).empty(); // crude but effective; maybe soften with a transition later
+          renderPrimitiveObject(val, $(this));
         }
-        else{
+        else {
+          $(this).empty(); // crude but effective; maybe soften with a transition later
+
+          // or even better, simply keep 
 around if it already exists
+          // so that jsPlumb connectors can persist.
+
+
           // add a stub so that we can connect it with a connector later.
           // IE needs this div to be NON-EMPTY in order to properly
           // render jsPlumb endpoints, so that's why we add an " "!
@@ -1488,7 +1528,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
           // make sure varname doesn't contain any weird
           // characters that are illegal for CSS ID's ...
           var varDivID = myViz.generateID('global__' + varnameToCssID(varname));
-          curTr.find("td.stackFrameValue").append('
 
');
+          $(this).append('
 
');
 
           assert(!connectionEndpointIDs.has(varDivID));
           var heapObjID = myViz.generateID('heap_object_' + getRefID(val));
@@ -1496,12 +1536,25 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
         }
       }
     });
+
+  globalsD3.exit()
+    .remove();
+
+
+  // for aesthetics, hide globals if there aren't any globals to display
+  if (curEntry.ordered_globals.length == 0) {
+    this.domRoot.find('#' + globalsID).hide();
+  }
+  else {
+    this.domRoot.find('#' + globalsID).show();
   }
 
 
+  /*
   $.each(curEntry.stack_to_render, function(i, e) {
     renderStackFrame(e, i, e.is_zombie);
   });
+  */
 
 
   function renderStackFrame(frame, ind, is_zombie) {
@@ -1601,9 +1654,9 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       var c = allConnections[i];
 
       // this is VERY VERY fragile code, since it assumes that going up
-      // five layers of parent() calls will get you from the source end
+      // FOUR layers of parent() calls will get you from the source end
       // of the connector to the enclosing stack frame
-      var stackFrameDiv = c.source.parent().parent().parent().parent().parent();
+      var stackFrameDiv = c.source.parent().parent().parent().parent();
 
       // if this connector starts in the selected stack frame ...
       if (stackFrameDiv.attr('id') == frameID) {

From 64b4f337a8063e01a325271c73e7f2aa82628ec1 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 8 Aug 2012 23:47:33 -0700
Subject: [PATCH 073/502] SUPER DUPER HACK

---
 PyTutorGAE/js/pytutor.js | 51 ++++++++++++++++++++++++----------------
 1 file changed, 31 insertions(+), 20 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index cd067f4c1..20073c622 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1505,36 +1505,47 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .selectAll('td')
     .data(function(d, i){return d;}) /* map varname down both columns */
     .each(function(varname, i) {
-      console.log('EACH!', i, varname);
-
       if (i == 1) {
         var val = curEntry.globals[varname];
 
-        if (isPrimitiveType(val)) {
-          $(this).empty(); // crude but effective; maybe soften with a transition later
-          renderPrimitiveObject(val, $(this));
-        }
-        else {
-          $(this).empty(); // crude but effective; maybe soften with a transition later
+        // include type in repr to prevent conflating integer 5 with string "5"
+        var valStringRepr = String(typeof val) + ':' + String(val);
 
-          // or even better, simply keep 
 around if it already exists
-          // so that jsPlumb connectors can persist.
+        // SUPER HACK - retrieve previous value as a hidden attribute
+        var prevValStringRepr = $(this).attr('data-curvalue');
 
+        // IMPORTANT! only clear the div and render a new element if the
+        // value has changed
+        if (valStringRepr != prevValStringRepr) {
+          // TODO: render a transition
 
-          // add a stub so that we can connect it with a connector later.
-          // IE needs this div to be NON-EMPTY in order to properly
-          // render jsPlumb endpoints, so that's why we add an " "!
+          $(this).empty(); // crude but effective for now
 
-          // make sure varname doesn't contain any weird
-          // characters that are illegal for CSS ID's ...
-          var varDivID = myViz.generateID('global__' + varnameToCssID(varname));
-          $(this).append('
 
');
+          if (isPrimitiveType(val)) {
+            renderPrimitiveObject(val, $(this));
+          }
+          else {
+            // add a stub so that we can connect it with a connector later.
+            // IE needs this div to be NON-EMPTY in order to properly
+            // render jsPlumb endpoints, so that's why we add an " "!
+
+            // make sure varname doesn't contain any weird
+            // characters that are illegal for CSS ID's ...
+            var varDivID = myViz.generateID('global__' + varnameToCssID(varname));
+            $(this).append('
 
');
+
+            assert(!connectionEndpointIDs.has(varDivID));
+            var heapObjID = myViz.generateID('heap_object_' + getRefID(val));
+            connectionEndpointIDs.set(varDivID, heapObjID);
+          }
 
-          assert(!connectionEndpointIDs.has(varDivID));
-          var heapObjID = myViz.generateID('heap_object_' + getRefID(val));
-          connectionEndpointIDs.set(varDivID, heapObjID);
+          console.log('CHANGED', varname, prevValStringRepr, valStringRepr);
         }
+
+        // SUPER HACK - set current value as a hidden string attribute
+        $(this).attr('data-curvalue', valStringRepr);
       }
+
     });
 
   globalsD3.exit()

From c973964f946553b4696fb25e4216efb06f5a913f Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 11:31:54 -0700
Subject: [PATCH 074/502] WORLD OF PAIN (and still not done yet)

---
 PyTutorGAE/css/pytutor.css |  8 ++--
 PyTutorGAE/js/pytutor.js   | 75 +++++++++++++++++++++++++++++++++++++-
 2 files changed, 78 insertions(+), 5 deletions(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index 6cb3807f5..8ab3d6ff5 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -487,11 +487,13 @@ td.dictKey .typeLabel {
 
 /* new stuff added for Online Python Tutor "2.0" release */
 
-div#stack {
-  float: left;
+div#stack, div#globals_area {
   padding-left: 10px;
   padding-right: 30px;
-  border-right: 1px dashed #bbbbbb;
+
+  /* no longer necessary ... */
+  /*float: left;*/
+  /* border-right: 1px dashed #bbbbbb; */
 }
 
 div.stackFrame, div.zombieStackFrame {
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 20073c622..912eea0d4 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -150,9 +150,11 @@ ExecutionVisualizer.prototype.render = function() {
           \
             \
               \
               ');
-          tbl.append('');
-        }
-        else {
-          tbl.append('');
-        }
-
-        var curTr = tbl.find('tr:last');
-
-        if (isPrimitiveType(val)) {
-          renderPrimitiveObject(val, curTr.find("td.stackFrameValue"));
-        }
-        else {
-          // add a stub so that we can connect it with a connector later.
-          // IE needs this div to be NON-EMPTY in order to properly
-          // render jsPlumb endpoints, so that's why we add an " "!
-
-          // make sure varname doesn't contain any weird
-          // characters that are illegal for CSS ID's ...
-          var varDivID = divID + '__' + varnameToCssID(varname);
-          curTr.find("td.stackFrameValue").append('
 
');
-
-          assert(!connectionEndpointIDs.has(varDivID));
-
-          var heapObjID = myViz.generateID('heap_object_' + getRefID(val));
-          connectionEndpointIDs.set(varDivID, heapObjID);
-        }
-      });
-    }
-  }
-
-  /*
-  $.each(curEntry.stack_to_render, function(i, e) {
-    renderStackFrame(e, i, e.is_zombie);
-  });
-  */
+      // optional (btw, this isn't a CSS id)
+      if (frame.parent_frame_id_list.length > 0) {
+        var parentFrameID = frame.parent_frame_id_list[0];
+        headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
+      }
 
+      console.log('HEADER:', i, headerLabel);
+      return headerLabel;
+    });
+ 
 
 
   // finally add all the connectors!

From fb1d46081cce3f29d2c537e46524782c2de4c276 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 21:35:06 -0700
Subject: [PATCH 087/502] works betta

---
 PyTutorGAE/js/pytutor.js | 28 +++++++++++++---------------
 1 file changed, 13 insertions(+), 15 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 6f602fa0c..5e6c04485 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1541,7 +1541,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
             connectionEndpointIDs.set(varDivID, heapObjID);
           }
 
-          //console.log('CHANGED', varname, prevValStringRepr, valStringRepr);
+          console.log('CHANGED', varname, prevValStringRepr, valStringRepr);
         }
 
         // SUPER HACK - set current value as a hidden string attribute
@@ -1583,12 +1583,10 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     // TODO: perhaps this table keeps on getting cleared out since it's done on enter()?!?
     .append('table')
     .attr('class', 'stackFrameVarTable')
-    .each(function(d, i) {console.log('stackFrameDiv.enter()', d.unique_hash);})
 
 
   var stackVarTable = stackFrameDiv
     .order() // VERY IMPORTANT to put in the order corresponding to data elements
-    .each(function(d, i) {console.log('stackFrameDiv.order() POST', d.unique_hash);})
     .select('table').selectAll('tr')
     .data(function(frame) {
         // each list element contains a reference to the entire frame
@@ -1603,17 +1601,14 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   stackVarTable
     .enter()
     .append('tr')
-    .each(function(d, i) {console.log('stackVarTable.enter()', d);})
   
 
   var stackVarTableCells = stackVarTable
     .selectAll('td')
-    .each(function(d, i) {console.log('stackVarTable UPDATE', d, i);})
     .data(function(d, i) {return [d, d] /* map identical data down both columns */;})
 
   stackVarTableCells.enter()
     .append('td')
-    .each(function(d, i) {console.log('stackVarTableCells.enter()', d, i);})
 
   stackVarTableCells
     .order() // VERY IMPORTANT to put in the order corresponding to data elements
@@ -1637,8 +1632,6 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       var varname = d.varname;
       var frame = d.frame;
 
-      console.log('stackVarTableCells.each()', varname, i);
-
       if (i == 1) {
         var val = frame.encoded_locals[varname];
 
@@ -1675,7 +1668,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
             connectionEndpointIDs.set(varDivID, heapObjID);
           }
 
-          //console.log('CHANGED', varname, prevValStringRepr, valStringRepr);
+          console.log('CHANGED', varname, prevValStringRepr, valStringRepr);
         }
 
         // SUPER HACK - set current value as a hidden string attribute
@@ -1690,9 +1683,15 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   stackFrameDiv.exit().remove();
 
-  // TODO: sometimes mistakenly renders TWICE on, say, closures :(
-  stackFrameDiv
-    .insert('div', ':first-child') // prepend header after the dust settles
+
+  // render stack frame headers in a "brute force" way by
+  // first clearing all of them ...
+  myViz.domRoot.find('.stackFrame,.zombieStackFrame').find('.stackFrameHeader').remove();
+
+  // ... and then rendering all of them again in one fell swoop
+  myViz.domRootD3.select('#stack').selectAll('.stackFrame,.zombieStackFrame')
+    .data(curEntry.stack_to_render)
+    .insert('div', ':first-child') // prepend before first child
     .attr('class', 'stackFrameHeader')
     .html(function(frame, i) {
       var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
@@ -1709,10 +1708,9 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
         headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
       }
 
-      console.log('HEADER:', i, headerLabel);
       return headerLabel;
-    });
- 
+    })
+    .each(function(frame, i) {console.log('DRAW stackFrameHeader', frame.unique_hash, i);})
 
 
   // finally add all the connectors!

From c985f70908ae23fe15db2466571f9319adc5e884 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 21:37:06 -0700
Subject: [PATCH 088/502] bah

---
 PyTutorGAE/js/pytutor.js | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 5e6c04485..1b327ef6a 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1686,7 +1686,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   // render stack frame headers in a "brute force" way by
   // first clearing all of them ...
-  myViz.domRoot.find('.stackFrame,.zombieStackFrame').find('.stackFrameHeader').remove();
+  myViz.domRoot.find('#stack').find('.stackFrame,.zombieStackFrame').find('.stackFrameHeader').remove();
 
   // ... and then rendering all of them again in one fell swoop
   myViz.domRootD3.select('#stack').selectAll('.stackFrame,.zombieStackFrame')
@@ -1710,7 +1710,6 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
       return headerLabel;
     })
-    .each(function(frame, i) {console.log('DRAW stackFrameHeader', frame.unique_hash, i);})
 
 
   // finally add all the connectors!

From 787baa2c0628e142fc0d26bcfa64612b848508e2 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 22:04:04 -0700
Subject: [PATCH 089/502] bam

---
 PyTutorGAE/js/pytutor.js | 30 ++++++++----------------------
 1 file changed, 8 insertions(+), 22 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 1b327ef6a..f07f99ddc 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1453,12 +1453,6 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   // Render globals and then stack frames using d3:
 
-  // TODO: However, I need to think carefully about what to use as
-  // object keys for stack objects.  Perhaps a combination of function
-  // name and current position index? This might handle recursive calls
-  // well (i.e., when there are multiple invocations of the same
-  // function on the stack)
-
 
   // render all global variables IN THE ORDER they were created by the program,
   // in order to ensure continuity:
@@ -1569,7 +1563,9 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   var stackFrameDiv = stackDiv.selectAll('div')
     .data(curEntry.stack_to_render, function(frame) {
-      return frame.unique_hash; // VERY IMPORTANT for properly handling closures and nested functions
+      // VERY VERY VERY IMPORTANT for properly handling closures and nested functions
+      // (see the backend code for more details)
+      return frame.unique_hash;
     });
 
   stackFrameDiv.enter()
@@ -1578,9 +1574,6 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack" + i)
                                                    : myViz.generateID("stack" + i);
     })
-    //.append('div')
-    //.attr('class', 'stackFrameHeader')
-    // TODO: perhaps this table keeps on getting cleared out since it's done on enter()?!?
     .append('table')
     .attr('class', 'stackFrameVarTable')
 
@@ -1609,30 +1602,23 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   stackVarTableCells.enter()
     .append('td')
+    .attr('class', function(d, i) {return (i == 0) ? 'stackFrameVar' : 'stackFrameValue';})
 
   stackVarTableCells
     .order() // VERY IMPORTANT to put in the order corresponding to data elements
-    .attr('class', function(d, i) {return (i == 0) ? 'stackFrameVar' : 'stackFrameValue';})
-    .html(function(d, i) {
+    .each(function(d, i) {
       var varname = d.varname;
       var frame = d.frame;
+
       if (i == 0) {
         if (varname == '__return__' && !frame.is_zombie) {
-          return 'Return value'
+          $(this).html('Return value');
         }
         else {
-          return varname;
+          $(this).html(varname);
         }
       }
       else {
-        return ''; // will update in .each()
-      }
-    })
-    .each(function(d, i) {
-      var varname = d.varname;
-      var frame = d.frame;
-
-      if (i == 1) {
         var val = frame.encoded_locals[varname];
 
         // include type in repr to prevent conflating integer 5 with string "5"

From de4c91cbd9eb6c95f6f712d0f43f9dfde1932baf Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 22:14:42 -0700
Subject: [PATCH 090/502] more debug msgs

---
 PyTutorGAE/js/pytutor.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index f07f99ddc..ca10a0d36 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1283,6 +1283,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
       assert(!connectionEndpointIDs.has(srcDivID));
       connectionEndpointIDs.set(srcDivID, dstDivID);
+      console.log('HEAP->HEAP', srcDivID, dstDivID);
 
       assert(!heapConnectionEndpointIDs.has(srcDivID));
       heapConnectionEndpointIDs.set(srcDivID, dstDivID);
@@ -1533,6 +1534,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
             assert(!connectionEndpointIDs.has(varDivID));
             var heapObjID = myViz.generateID('heap_object_' + getRefID(val));
             connectionEndpointIDs.set(varDivID, heapObjID);
+            console.log('STACK->HEAP', varDivID, heapObjID);
           }
 
           console.log('CHANGED', varname, prevValStringRepr, valStringRepr);
@@ -1652,9 +1654,10 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
             assert(!connectionEndpointIDs.has(varDivID));
             var heapObjID = myViz.generateID('heap_object_' + getRefID(val));
             connectionEndpointIDs.set(varDivID, heapObjID);
+            console.log('STACK->HEAP', varDivID, heapObjID);
           }
 
-          console.log('CHANGED', varname, prevValStringRepr, valStringRepr);
+          console.log('CHANGED', frame.unique_hash, varname, prevValStringRepr, valStringRepr);
         }
 
         // SUPER HACK - set current value as a hidden string attribute

From 7922e482eccb4ad674b14db05bb6cefc8bae3aee Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 22:28:06 -0700
Subject: [PATCH 091/502] VITAL

---
 PyTutorGAE/js/pytutor.js | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index ca10a0d36..5fb8ca4bd 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1563,7 +1563,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   var stackDiv = myViz.domRootD3.select('#stack');
 
-  var stackFrameDiv = stackDiv.selectAll('div')
+  var stackFrameDiv = stackDiv.selectAll('div.stackFrame,div.zombieStackFrame')
     .data(curEntry.stack_to_render, function(frame) {
       // VERY VERY VERY IMPORTANT for properly handling closures and nested functions
       // (see the backend code for more details)
@@ -1576,8 +1576,9 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack" + i)
                                                    : myViz.generateID("stack" + i);
     })
+    .each(function(frame, i) {console.log('NEW STACK FRAME', frame.unique_hash);})
     .append('table')
-    .attr('class', 'stackFrameVarTable')
+    .attr('class', 'stackFrameVarTable');
 
 
   var stackVarTable = stackFrameDiv
@@ -1670,7 +1671,9 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   stackVarTable.exit().remove();
 
-  stackFrameDiv.exit().remove();
+  stackFrameDiv.exit()
+    .each(function(frame, i) {console.log('DEL STACK FRAME', frame.unique_hash, i);})
+    .remove();
 
 
   // render stack frame headers in a "brute force" way by

From a0ccaff92bc8d2ca8c96ea3edcd062dbb18eb768 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 22:35:48 -0700
Subject: [PATCH 092/502] YAHHH

---
 PyTutorGAE/js/pytutor.js | 60 +++++++++++++++++++---------------------
 1 file changed, 28 insertions(+), 32 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 5fb8ca4bd..13b8e7e87 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1560,9 +1560,11 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   }
 
 
+  // holy cow, the d3 code for stack rendering is ABSOLUTELY NUTS!
 
   var stackDiv = myViz.domRootD3.select('#stack');
 
+  // VERY IMPORTANT for selectAll selector to be SUPER specific here!
   var stackFrameDiv = stackDiv.selectAll('div.stackFrame,div.zombieStackFrame')
     .data(curEntry.stack_to_render, function(frame) {
       // VERY VERY VERY IMPORTANT for properly handling closures and nested functions
@@ -1570,13 +1572,36 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       return frame.unique_hash;
     });
 
-  stackFrameDiv.enter()
+  var sfdEnter = stackFrameDiv.enter()
     .append('div')
     .attr('class', function(d, i) {return d.is_zombie ? 'zombieStackFrame' : 'stackFrame';})
     .attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack" + i)
                                                    : myViz.generateID("stack" + i);
     })
     .each(function(frame, i) {console.log('NEW STACK FRAME', frame.unique_hash);})
+
+  sfdEnter
+    .append('div')
+    .attr('class', 'stackFrameHeader')
+    .html(function(frame, i) {
+      var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
+      var headerLabel = funcName + '()';
+
+      var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
+      if (frameID) {
+        headerLabel = 'f' + frameID + ': ' + headerLabel;
+      }
+
+      // optional (btw, this isn't a CSS id)
+      if (frame.parent_frame_id_list.length > 0) {
+        var parentFrameID = frame.parent_frame_id_list[0];
+        headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
+      }
+
+      return headerLabel;
+    })
+
+  sfdEnter
     .append('table')
     .attr('class', 'stackFrameVarTable');
 
@@ -1614,12 +1639,10 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       var frame = d.frame;
 
       if (i == 0) {
-        if (varname == '__return__' && !frame.is_zombie) {
+        if (varname == '__return__' && !frame.is_zombie)
           $(this).html('Return value');
-        }
-        else {
+        else
           $(this).html(varname);
-        }
       }
       else {
         var val = frame.encoded_locals[varname];
@@ -1676,33 +1699,6 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .remove();
 
 
-  // render stack frame headers in a "brute force" way by
-  // first clearing all of them ...
-  myViz.domRoot.find('#stack').find('.stackFrame,.zombieStackFrame').find('.stackFrameHeader').remove();
-
-  // ... and then rendering all of them again in one fell swoop
-  myViz.domRootD3.select('#stack').selectAll('.stackFrame,.zombieStackFrame')
-    .data(curEntry.stack_to_render)
-    .insert('div', ':first-child') // prepend before first child
-    .attr('class', 'stackFrameHeader')
-    .html(function(frame, i) {
-      var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
-      var headerLabel = funcName + '()';
-
-      var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
-      if (frameID) {
-        headerLabel = 'f' + frameID + ': ' + headerLabel;
-      }
-
-      // optional (btw, this isn't a CSS id)
-      if (frame.parent_frame_id_list.length > 0) {
-        var parentFrameID = frame.parent_frame_id_list[0];
-        headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
-      }
-
-      return headerLabel;
-    })
-
 
   // finally add all the connectors!
   connectionEndpointIDs.forEach(function(varID, valueID) {

From 3cf4482cdd115d7ba09a871f16d7cce85225cee0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 22:40:30 -0700
Subject: [PATCH 093/502] back to divs

---
 PyTutorGAE/js/pytutor.js | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 13b8e7e87..69431a4f3 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1529,7 +1529,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
             // make sure varname doesn't contain any weird
             // characters that are illegal for CSS ID's ...
             var varDivID = myViz.generateID('global__' + varnameToCssID(varname));
-            $(this).append(' ');
+            $(this).append('
 
');
 
             assert(!connectionEndpointIDs.has(varDivID));
             var heapObjID = myViz.generateID('heap_object_' + getRefID(val));
@@ -1672,8 +1672,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
             // characters that are illegal for CSS ID's ...
             var varDivID = myViz.generateID(varnameToCssID(frame.unique_hash + '__' + varname));
 
-            // creepy - 
 doesn't work here, but  does ... ugh
-            $(this).append(' ');
+            $(this).append('
 
');
 
             assert(!connectionEndpointIDs.has(varDivID));
             var heapObjID = myViz.generateID('heap_object_' + getRefID(val));

From 577382ce9274dbe9955623b4fae31bb9bc403bfa Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 22:54:34 -0700
Subject: [PATCH 094/502] Unicode lambdas :)

---
 PyTutorGAE/pg_encoder.py | 5 ++++-
 PyTutorGAE/pg_logger.py  | 5 +++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/PyTutorGAE/pg_encoder.py b/PyTutorGAE/pg_encoder.py
index b15e10d19..ab671eef8 100644
--- a/PyTutorGAE/pg_encoder.py
+++ b/PyTutorGAE/pg_encoder.py
@@ -168,7 +168,10 @@ def encode(self, dat):
         if argspec.keywords:
           printed_args.extend(['**' + e for e in argspec.keywords])
 
-        pretty_name = get_name(dat) + '(' + ', '.join(printed_args) + ')'
+        func_name = get_name(dat)
+        if func_name == '':
+          func_name = u"\u03BB" # Unicode lambda :)
+        pretty_name = func_name + '(' + ', '.join(printed_args) + ')'
         new_obj.extend(['FUNCTION', pretty_name, None]) # the final element will be filled in later
       else:
         typeStr = str(typ)
diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index 88ce6e2e0..e8b4a671f 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -258,9 +258,10 @@ def create_encoded_stack_entry(cur_frame):
 
           cur_name = cur_frame.f_code.co_name
 
-          # special case for lambdas - grab their line numbers too
+          # special case for lambdas - grab their line numbers too (or not)
           if cur_name == '':
-            cur_name = ''
+            # Unicode lambda :)
+            cur_name = u"\u03BB" # + ':line' + str(cur_frame.f_code.co_firstlineno)
           elif cur_name == '':
             cur_name = 'unnamed function'
 

From 1220a8ea4cd0cca24add02ec61f052413d305d66 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 10 Aug 2012 09:43:00 -0700
Subject: [PATCH 095/502] don't redraw ALL jsPlumb arrows on each iteration

---
 PyTutorGAE/js/pytutor.js | 30 ++++++++++++++++++------------
 1 file changed, 18 insertions(+), 12 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 69431a4f3..517ae2f6a 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1118,11 +1118,6 @@ ExecutionVisualizer.prototype.precomputeCurTraceLayouts = function() {
 // of data structure aliasing. That is, aliased objects were rendered
 // multiple times, and a unique ID label was used to identify aliases.
 ExecutionVisualizer.prototype.renderDataStructures = function() {
-  // TODO: this is a known performance bottleneck (e.g., try to
-  // scroll quickly through the Towers of Hanoi example) since
-  // we are removing and redrawing ALL arrows on every call, so
-  // look into incrementally redrawing only what's changed between calls.
-  this.jsPlumbInstance.reset();
 
   var myViz = this; // to prevent confusion of 'this' inside of nested functions
 
@@ -1141,6 +1136,9 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   //
   // The reason we need to prepend this.visualizerID is because jsPlumb needs
   // GLOBALLY UNIQUE IDs for use as connector endpoints.
+
+  // the only elements in these sets are NEW elements to be rendered in this
+  // particular call to renderDataStructures.
   var connectionEndpointIDs = d3.map();
   var heapConnectionEndpointIDs = d3.map(); // subset of connectionEndpointIDs for heap->heap connections
 
@@ -1281,9 +1279,11 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
       var dstDivID = myViz.generateID('heap_object_' + objID);
 
+      // TODO: we might be able to further optimize, since we might be re-drawing
+      // HEAP->HEAP connections when we can just keep the existing ones
       assert(!connectionEndpointIDs.has(srcDivID));
       connectionEndpointIDs.set(srcDivID, dstDivID);
-      console.log('HEAP->HEAP', srcDivID, dstDivID);
+      //console.log('HEAP->HEAP', srcDivID, dstDivID);
 
       assert(!heapConnectionEndpointIDs.has(srcDivID));
       heapConnectionEndpointIDs.set(srcDivID, dstDivID);
@@ -1534,10 +1534,10 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
             assert(!connectionEndpointIDs.has(varDivID));
             var heapObjID = myViz.generateID('heap_object_' + getRefID(val));
             connectionEndpointIDs.set(varDivID, heapObjID);
-            console.log('STACK->HEAP', varDivID, heapObjID);
+            //console.log('STACK->HEAP', varDivID, heapObjID);
           }
 
-          console.log('CHANGED', varname, prevValStringRepr, valStringRepr);
+          //console.log('CHANGED', varname, prevValStringRepr, valStringRepr);
         }
 
         // SUPER HACK - set current value as a hidden string attribute
@@ -1578,7 +1578,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack" + i)
                                                    : myViz.generateID("stack" + i);
     })
-    .each(function(frame, i) {console.log('NEW STACK FRAME', frame.unique_hash);})
+    //.each(function(frame, i) {console.log('NEW STACK FRAME', frame.unique_hash);})
 
   sfdEnter
     .append('div')
@@ -1677,10 +1677,10 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
             assert(!connectionEndpointIDs.has(varDivID));
             var heapObjID = myViz.generateID('heap_object_' + getRefID(val));
             connectionEndpointIDs.set(varDivID, heapObjID);
-            console.log('STACK->HEAP', varDivID, heapObjID);
+            //console.log('STACK->HEAP', varDivID, heapObjID);
           }
 
-          console.log('CHANGED', frame.unique_hash, varname, prevValStringRepr, valStringRepr);
+          //console.log('CHANGED', frame.unique_hash, varname, prevValStringRepr, valStringRepr);
         }
 
         // SUPER HACK - set current value as a hidden string attribute
@@ -1694,7 +1694,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   stackVarTable.exit().remove();
 
   stackFrameDiv.exit()
-    .each(function(frame, i) {console.log('DEL STACK FRAME', frame.unique_hash, i);})
+    //.each(function(frame, i) {console.log('DEL STACK FRAME', frame.unique_hash, i);})
     .remove();
 
 
@@ -1704,6 +1704,12 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     myViz.jsPlumbInstance.connect({source: varID, target: valueID});
   });
 
+  /*
+  myViz.jsPlumbInstance.select().each(function(c) {
+    console.log(c.sourceId, c.targetId);
+  });
+  */
+
 
   function highlight_frame(frameID) {
     var allConnections = myViz.jsPlumbInstance.getConnections();

From d9c394658b30acba5ecfb05d4d60c670f392b4cb Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 10 Aug 2012 09:58:06 -0700
Subject: [PATCH 096/502] ergh

---
 PyTutorGAE/js/pytutor.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 517ae2f6a..2cc863363 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1640,7 +1640,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
       if (i == 0) {
         if (varname == '__return__' && !frame.is_zombie)
-          $(this).html('Return value');
+          $(this).html('Return
value');
         else
           $(this).html(varname);
       }
@@ -1698,8 +1698,11 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .remove();
 
 
+  // crap, we need to repaint all of the existing connectors in case their endpoints have shifted
+  // due to page elements shifting around :(
+  myViz.jsPlumbInstance.repaintEverything();
 
-  // finally add all the connectors!
+  // finally add all the NEW connectors that have arisen in this call to renderDataStructures
   connectionEndpointIDs.forEach(function(varID, valueID) {
     myViz.jsPlumbInstance.connect({source: varID, target: valueID});
   });

From 6f2e34160a673c7312f2b1a3eec9cc32710e7a3d Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 10 Aug 2012 10:17:51 -0700
Subject: [PATCH 097/502] minor futzing

---
 PyTutorGAE/js/pytutor.js | 19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 2cc863363..0b010d218 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -53,9 +53,9 @@ function ExecutionVisualizer(domRootID, dat, params) {
   // cool, we can create a separate jsPlumb instance for each visualization:
   this.jsPlumbInstance = jsPlumb.getInstance({
     Endpoint: ["Dot", {radius:3}],
-    EndpointStyles: [{fillStyle: lightGray}, {fillstyle: null} /* make right endpoint invisible */],
+    EndpointStyles: [{fillStyle: darkBlue}, {fillstyle: null} /* make right endpoint invisible */],
     Anchors: ["RightMiddle", "LeftMiddle"],
-    PaintStyle: {lineWidth:1, strokeStyle: lightGray},
+    PaintStyle: {lineWidth:1, strokeStyle: darkBlue},
 
     // bezier curve style:
     //Connector: [ "Bezier", { curviness:15 }], /* too much 'curviness' causes lines to run together */
@@ -1715,10 +1715,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
 
   function highlight_frame(frameID) {
-    var allConnections = myViz.jsPlumbInstance.getConnections();
-    for (var i = 0; i < allConnections.length; i++) {
-      var c = allConnections[i];
-
+    myViz.jsPlumbInstance.select().each(function(c) {
       // this is VERY VERY fragile code, since it assumes that going up
       // FOUR layers of parent() calls will get you from the source end
       // of the connector to the enclosing stack frame
@@ -1735,12 +1732,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       }
       // for heap->heap connectors
       else if (heapConnectionEndpointIDs.has(c.endpoints[0].elementId)) {
-        // then HIGHLIGHT IT!
-        c.setPaintStyle({lineWidth:1, strokeStyle: darkBlue});
-        c.endpoints[0].setPaintStyle({fillStyle: darkBlue});
-        //c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
-
-        $(c.canvas).css("z-index", 1000); // ... and move it to the VERY FRONT
+        // NOP since it's already the color and style we set by default
       }
       else {
         // else unhighlight it
@@ -1750,7 +1742,8 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
         $(c.canvas).css("z-index", 0);
       }
-    }
+    });
+
 
     // clear everything, then just activate this one ...
     myViz.domRoot.find(".stackFrame").removeClass("highlightedStackFrame");

From 10718750cb7c9abbe53ebb29f2fa1fc8e1ac92c8 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 10 Aug 2012 10:49:37 -0700
Subject: [PATCH 098/502] altered aliasing example

---
 example-code/aliasing.txt | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/example-code/aliasing.txt b/example-code/aliasing.txt
index 174ba2ec4..1426e8bb6 100644
--- a/example-code/aliasing.txt
+++ b/example-code/aliasing.txt
@@ -1,4 +1,9 @@
-# Example of aliasing
+x = [1, 2, 3]
+y = [4, 5, 6]
+z = y
+y = x
+x = z
+
 x = [1, 2, 3]
 y = x
 x.append(4)
@@ -8,11 +13,12 @@ x.append(6)
 y.append(7)
 y = "hello"
 
-def foo(lst): # breakpoint
+
+def foo(lst):
     lst.append("hello")
     bar(lst)
 
-def bar(myLst): # breakpoint
+def bar(myLst):
     print myLst
 
 foo(x)

From 9ff092107d134a023e477d50b2b40803da6e14fa Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 10 Aug 2012 11:27:47 -0700
Subject: [PATCH 099/502] more patchies

---
 PyTutorGAE/embedding-examples.js  | 13 +++++++++++--
 PyTutorGAE/generate_json_trace.py |  5 +++--
 PyTutorGAE/js/opt-frontend.js     |  6 ++----
 PyTutorGAE/js/pytutor.js          | 10 ++++++++--
 example-code/aliasing.txt         |  4 ++--
 5 files changed, 26 insertions(+), 12 deletions(-)

diff --git a/PyTutorGAE/embedding-examples.js b/PyTutorGAE/embedding-examples.js
index 5476cdd12..92d924683 100644
--- a/PyTutorGAE/embedding-examples.js
+++ b/PyTutorGAE/embedding-examples.js
@@ -1,10 +1,10 @@
 // Traces generated by generate_json_trace.py
 
-var aliasing = {"code": "# Example of aliasing\nx = [1, 2, 3]\ny = x\nx.append(4)\ny.append(5)\nz = [1, 2, 3, 4, 5]\nx.append(6)\ny.append(7)\ny = \"hello\"\n\ndef foo(lst): # breakpoint\n    lst.append(\"hello\")\n    bar(lst)\n\ndef bar(myLst): # breakpoint\n    print myLst\n\nfoo(x)\nfoo(z)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"x": ["REF", 1]}, "heap": {"1": ["LIST", 1, 2, 3]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["x", "y"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": ["REF", 1], "x": ["REF", 1]}, "heap": {"1": ["LIST", 1, 2, 3]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["x", "y"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": ["REF", 1], "x": ["REF", 1]}, "heap": {"1": ["LIST", 1, 2, 3, 4]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["x", "y"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": ["REF", 1], "x": ["REF", 1]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5]}, "line": 6, "event": "step_line"}, {"ordered_globals": ["x", "y", "z"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": ["REF", 1], "x": ["REF", 1], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5], "2": ["LIST", 1, 2, 3, 4, 5]}, "line": 7, "event": "step_line"}, {"ordered_globals": ["x", "y", "z"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": ["REF", 1], "x": ["REF", 1], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6], "2": ["LIST", 1, 2, 3, 4, 5]}, "line": 8, "event": "step_line"}, {"ordered_globals": ["x", "y", "z"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": ["REF", 1], "x": ["REF", 1], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7], "2": ["LIST", 1, 2, 3, 4, 5]}, "line": 9, "event": "step_line"}, {"ordered_globals": ["x", "y", "z"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": "hello", "x": ["REF", 1], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7], "2": ["LIST", 1, 2, 3, 4, 5]}, "line": 11, "event": "step_line"}, {"ordered_globals": ["x", "y", "z", "foo"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null]}, "line": 15, "event": "step_line"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 18, "event": "step_line"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "", "func_name": "foo", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 1]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 11, "event": "call"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "", "func_name": "foo", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 1]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 12, "event": "step_line"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "", "func_name": "foo", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 1]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 13, "event": "step_line"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "", "func_name": "bar", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 1]}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "bar", "is_zombie": false, "ordered_varnames": ["myLst"], "frame_id": null, "encoded_locals": {"myLst": ["REF", 1]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 15, "event": "call"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "", "func_name": "bar", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 1]}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "bar", "is_zombie": false, "ordered_varnames": ["myLst"], "frame_id": null, "encoded_locals": {"myLst": ["REF", 1]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5], "3": ["FUNCTION", "foo(lst)", null], "4": ["FUNCTION", "bar(myLst)", null]}, "line": 16, "event": "step_line"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n", "func_name": "bar", "stack_to_render": [{"func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 1]}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "bar", "is_zombie": false, "ordered_varnames": ["myLst", "__return__"], "frame_id": null, "encoded_locals": {"__return__": null, "myLst": ["REF", 1]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 1], "foo": ["REF", 3], "bar": ["REF", 4], "z": ["REF", 2]}, "heap": {"1": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "2": ["LIST", 1, 2, 3, 4, 5], "3": 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"frame_id": null, "encoded_locals": {"__return__": null, "myLst": ["REF", 4]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 3], "foo": ["REF", 5], "bar": ["REF", 6], "z": ["REF", 4]}, "heap": {"3": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "4": ["LIST", 1, 2, 3, 4, 5, "hello"], "5": ["FUNCTION", "foo(lst)", null], "6": ["FUNCTION", "bar(myLst)", null]}, "line": 22, "event": "return"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n[1, 2, 3, 4, 5, 'hello']\n", "func_name": "foo", "stack_to_render": [{"unique_hash": "foo_i0", "func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst", "__return__"], "frame_id": null, "encoded_locals": {"__return__": null, "lst": ["REF", 4]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 3], "foo": ["REF", 5], "bar": ["REF", 6], "z": ["REF", 4]}, "heap": {"3": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "4": ["LIST", 1, 2, 3, 4, 5, "hello"], "5": ["FUNCTION", "foo(lst)", null], "6": ["FUNCTION", "bar(myLst)", null]}, "line": 19, "event": "return"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n[1, 2, 3, 4, 5, 'hello']\n", "func_name": "", "stack_to_render": [], "globals": {"y": "hello", "x": ["REF", 3], "z": ["REF", 4], "bar": ["REF", 6], "foo": ["REF", 5]}, "heap": {"3": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "4": ["LIST", 1, 2, 3, 4, 5, "hello"], "5": ["FUNCTION", "foo(lst)", null], "6": ["FUNCTION", "bar(myLst)", null]}, "line": 25, "event": "return"}]};
 
 var aliasing5 = {"code": "x = None\nfor i in range(5, 0, -1):\n  x = (i, x)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 1, "event": "step_line"}, {"ordered_globals": ["x"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"x": null}, "heap": {}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 5, "x": null}, "heap": {}, "line": 3, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 5, "x": ["REF", 1]}, "heap": {"1": ["TUPLE", 5, null]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 4, "x": ["REF", 1]}, "heap": {"1": ["TUPLE", 5, null]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 4, "x": ["REF", 2]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 3, "x": ["REF", 2]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 3, "x": ["REF", 3]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 2, "x": ["REF", 3]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 2, "x": ["REF", 4]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]], "4": ["TUPLE", 2, ["REF", 3]]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 1, "x": ["REF", 4]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]], "4": ["TUPLE", 2, ["REF", 3]]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 1, "x": ["REF", 5]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]], "4": ["TUPLE", 2, ["REF", 3]], "5": ["TUPLE", 1, ["REF", 4]]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 1, "x": ["REF", 5]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]], "4": ["TUPLE", 2, ["REF", 3]], "5": ["TUPLE", 1, ["REF", 4]]}, "line": 2, "event": "return"}]};
 
-var hanoi = {"code": "# move a stack of n disks from stack a to stack b,\n# using tmp as a temporary stack\ndef TowerOfHanoi(n, a, b, tmp):\n    if n == 1:\n        b.append(a.pop())\n    else:\n        TowerOfHanoi(n-1, a, tmp, b)\n        b.append(a.pop())\n        TowerOfHanoi(n-1, tmp, b, a)\n        \nstack1 = [4,3,2,1]\nstack2 = []\nstack3 = []\n      \n# transfer stack1 to stack3 using Tower of Hanoi rules\nTowerOfHanoi(len(stack1), stack1, stack3, stack2)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 3, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"TowerOfHanoi": ["REF", 1]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null]}, "line": 11, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1]}, "line": 12, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"]}, "line": 13, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 16, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 3, "event": "call"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 7, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 4], "a": ["REF", 2], "b": ["REF", 3], "n": 3}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 3, "event": "call"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 4], "a": ["REF", 2], "b": ["REF", 3], "n": 3}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 4], "a": ["REF", 2], "b": ["REF", 3], "n": 3}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 7, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 4], "a": ["REF", 2], "b": ["REF", 3], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 3, "event": "call"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, 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"stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "__return__": null, "b": ["REF", 4], "n": 4}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 9, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 16, "event": "return"}]};
+var hanoi = {"code": "# move a stack of n disks from stack a to stack b,\n# using tmp as a temporary stack\ndef TowerOfHanoi(n, a, b, tmp):\n    if n == 1:\n        b.append(a.pop())\n    else:\n        TowerOfHanoi(n-1, a, tmp, b)\n        b.append(a.pop())\n        TowerOfHanoi(n-1, tmp, b, a)\n        \nstack1 = [4,3,2,1]\nstack2 = []\nstack3 = []\n      \n# transfer stack1 to stack3 using Tower of Hanoi rules\nTowerOfHanoi(len(stack1), stack1, stack3, stack2)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 3, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"TowerOfHanoi": ["REF", 1]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null]}, "line": 11, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1]}, "line": 12, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"]}, "line": 13, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 16, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 3, "event": "call"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 7, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 4], "a": ["REF", 2], "b": ["REF", 3], "n": 3}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 3, "event": "call"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": 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["REF", 4], "a": ["REF", 2], "b": ["REF", 3], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 2, 1], "3": ["LIST"], "4": ["LIST", 4, 3]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i2", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i3", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 4], "a": ["REF", 2], "__return__": null, "b": ["REF", 3], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 2], "3": ["LIST", 1], "4": ["LIST", 4, 3]}, "line": 5, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i2", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 2], "3": ["LIST", 1], "4": ["LIST", 4, 3]}, "line": 8, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i2", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST", 1], "4": ["LIST", 4, 3, 2]}, "line": 9, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i2", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i3", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST", 1], "4": ["LIST", 4, 3, 2]}, "line": 3, "event": "call"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i2", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i3", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST", 1], "4": ["LIST", 4, 3, 2]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i2", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i3", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST", 1], "4": ["LIST", 4, 3, 2]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i2", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i3", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "__return__": null, "b": ["REF", 4], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 5, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i2", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "__return__": null, "b": ["REF", 4], "n": 2}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 9, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "__return__": null, "b": ["REF", 4], "n": 3}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 9, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "__return__": null, "b": ["REF", 4], "n": 4}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 9, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 16, "event": "return"}]};
 
 
 var aliasingViz = null;
@@ -15,5 +15,14 @@ $(document).ready(function() {
   aliasingViz = new ExecutionVisualizer('aliasingDiv', aliasing, {hideOutput: true, codeDivHeight: 150});
   aliasing5Viz = new ExecutionVisualizer('aliasing5Div', aliasing5, {hideOutput: true});
   hanoiViz = new ExecutionVisualizer('hanoiDiv', hanoi, {startingInstruction: 45, hideOutput: true});
+
+  // redraw connector arrows on window resize
+  $(window).resize(function() {
+    aliasingViz.redrawConnectors();
+    aliasing5Viz.redrawConnectors();
+    hanoiViz.redrawConnectors();
+  });
+
+
 });
 
diff --git a/PyTutorGAE/generate_json_trace.py b/PyTutorGAE/generate_json_trace.py
index e973bc4a4..380463a56 100644
--- a/PyTutorGAE/generate_json_trace.py
+++ b/PyTutorGAE/generate_json_trace.py
@@ -6,8 +6,9 @@
 def json_finalizer(input_code, output_trace):
   ret = dict(code=input_code, trace=output_trace)
   json_output = json.dumps(ret, indent=None) # use indent=None for most compact repr
-  print json_output
+  print(json_output)
 
 
-pg_logger.exec_script_str(open(sys.argv[1]).read(), json_finalizer)
+for f in sys.argv[1:]:
+  pg_logger.exec_script_str(open(f).read(), json_finalizer)
 
diff --git a/PyTutorGAE/js/opt-frontend.js b/PyTutorGAE/js/opt-frontend.js
index 551ed34f4..54beecbac 100644
--- a/PyTutorGAE/js/opt-frontend.js
+++ b/PyTutorGAE/js/opt-frontend.js
@@ -377,12 +377,10 @@ $(document).ready(function() {
   });
 
 
-  // redraw everything on window resize so that connectors are in the
-  // right place
-  // TODO: can be SLOW on older browsers!!!
+  // redraw connector arrows on window resize
   $(window).resize(function() {
     if (appMode == 'visualize') {
-      myVisualizer.updateOutput();
+      myVisualizer.redrawConnectors();
     }
   });
 
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 0b010d218..65d72fe9e 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1767,6 +1767,12 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 }
 
 
+
+ExecutionVisualizer.prototype.redrawConnectors = function() {
+  this.jsPlumbInstance.repaintEverything();
+}
+
+
 // Utilities
 
 
@@ -1790,9 +1796,9 @@ var hoverBreakpointColor = medLightBlue;
 
 
 function assert(cond) {
-  // TODO: add more precision in the error message
   if (!cond) {
-    alert("Error: ASSERTION FAILED!!!");
+    alert("Assertion Failure (see console log for backtrace)");
+    throw 'Assertion Failure';
   }
 }
 
diff --git a/example-code/aliasing.txt b/example-code/aliasing.txt
index 1426e8bb6..eb326fc5d 100644
--- a/example-code/aliasing.txt
+++ b/example-code/aliasing.txt
@@ -4,11 +4,11 @@ z = y
 y = x
 x = z
 
-x = [1, 2, 3]
+x = [1, 2, 3] # a different [1, 2, 3] list!
 y = x
 x.append(4)
 y.append(5)
-z = [1, 2, 3, 4, 5]
+z = [1, 2, 3, 4, 5] # a different list!
 x.append(6)
 y.append(7)
 y = "hello"

From 5b0df5efbf6af9878d687e329b19aad814c178bd Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 10 Aug 2012 11:41:16 -0700
Subject: [PATCH 100/502] more changes to make it work on python 2 & 3
 simultaneously

---
 PyTutorGAE/js/opt-frontend.js | 4 +++-
 PyTutorGAE/js/pytutor.js      | 4 ++--
 PyTutorGAE/pg_logger.py       | 5 ++++-
 3 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/PyTutorGAE/js/opt-frontend.js b/PyTutorGAE/js/opt-frontend.js
index 54beecbac..1d0b56c55 100644
--- a/PyTutorGAE/js/opt-frontend.js
+++ b/PyTutorGAE/js/opt-frontend.js
@@ -29,6 +29,8 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 // Pre-reqs: pytutor.js and jquery.ba-bbq.min.js should be imported BEFORE this file
 
+var backend_script = 'exec'; // URL of backend script, which must eventually call pg_logger.py
+
 var appMode = 'edit'; // 'edit' or 'visualize'
 
 var preseededCode = null;     // if you passed in a 'code=' in the URL, then set this var
@@ -137,7 +139,7 @@ $(document).ready(function() {
     $("#pyOutputPane").hide();
 
 
-    $.get("exec",
+    $.get(backend_script,
           {user_script : pyInputCodeMirror.getValue()},
           function(dataFromBackend) {
             var trace = dataFromBackend.trace;
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 65d72fe9e..41b08397b 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -32,7 +32,7 @@ var curVisualizerID = 1; // global to uniquely identify each ExecutionVisualizer
 // domRootID is the string ID of the root element where to render this instance
 // dat is data returned by the Python Tutor backend consisting of two fields:
 //   code  - string of executed code
-//   trace - a full execution trace 
+//   trace - a full execution trace
 // params contains optional parameters, such as:
 //   startingInstruction - the (one-indexed) execution point to display upon rendering
 //   hideOutput - hide "Program output" and "Generate URL" displays
@@ -356,7 +356,7 @@ ExecutionVisualizer.prototype.setKeyboardBindings = function() {
     leftTablePane.focus();
   });
   */
-    
+ 
  
   leftTablePane.keydown(function(k) {
     if (!myViz.keyStuckDown) {
diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index e8b4a671f..8ec958967 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -36,7 +36,10 @@
 import traceback
 import types
 
-import cStringIO
+if sys.version_info[0] == 3:
+  import io as cStringIO
+else:
+  import cStringIO
 import pg_encoder
 
 

From d8f7b0dbf4c829db5ab6349b0bd64b312fbd2bbe Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 10 Aug 2012 12:05:22 -0700
Subject: [PATCH 101/502] integrated more of john's changes for python 3
 compatibility

---
 PyTutorGAE/README        |  4 +++
 PyTutorGAE/pg_encoder.py | 65 +++++++++++++++++++++++++++++-----------
 PyTutorGAE/pg_logger.py  |  3 --
 3 files changed, 52 insertions(+), 20 deletions(-)
 create mode 100644 PyTutorGAE/README

diff --git a/PyTutorGAE/README b/PyTutorGAE/README
new file mode 100644
index 000000000..b63b1d1fc
--- /dev/null
+++ b/PyTutorGAE/README
@@ -0,0 +1,4 @@
+Thanks to John DeNero, this version of Online Python Tutor (v3) should work on both Python 2 and 3.
+
+TODO: write more detailed instructions for running on Google App Engine (Python 2.7) and CGI (Python 2.X or 3.X)
+
diff --git a/PyTutorGAE/pg_encoder.py b/PyTutorGAE/pg_encoder.py
index ab671eef8..cc86a87d6 100644
--- a/PyTutorGAE/pg_encoder.py
+++ b/PyTutorGAE/pg_encoder.py
@@ -22,6 +22,8 @@
 # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+# Thanks to John DeNero for making the encoder work on both Python 2 and 3
+
 
 # Given an arbitrary piece of Python data, encode it in such a manner
 # that it can be later encoded into JSON.
@@ -50,11 +52,17 @@
 
 
 import re, types
+import sys
 typeRE = re.compile("")
 classRE = re.compile("")
 
 import inspect
 
+is_python3 = (sys.version_info[0] == 3)
+if is_python3:
+  long = None # Avoid NameError when evaluating "long"
+
+
 def get_name(obj):
   """Return the name of an object."""
   return obj.__name__ if hasattr(obj, '__name__') else get_name(type(obj))
@@ -141,23 +149,6 @@ def encode(self, dat):
           # don't display some built-in locals ...
           if k not in ('__module__', '__return__', '__locals__'):
             new_obj.append([self.encode(k), self.encode(v)])
-
-      elif typ in (types.InstanceType, types.ClassType, types.TypeType) or \
-           classRE.match(str(typ)):
-        # ugh, classRE match is a bit of a hack :(
-        if typ == types.InstanceType or classRE.match(str(typ)):
-          new_obj.extend(['INSTANCE', dat.__class__.__name__])
-        else:
-          superclass_names = [e.__name__ for e in dat.__bases__]
-          new_obj.extend(['CLASS', dat.__name__, superclass_names])
-
-        # traverse inside of its __dict__ to grab attributes
-        # (filter out useless-seeming ones):
-        user_attrs = sorted([e for e in dat.__dict__.keys() 
-                             if e not in ('__doc__', '__module__', '__return__')])
-
-        for attr in user_attrs:
-          new_obj.append([self.encode(attr), self.encode(dat.__dict__[attr])])
       elif typ in (types.FunctionType, types.MethodType):
         # NB: In Python 3.0, getargspec is deprecated in favor of getfullargspec
         argspec = inspect.getargspec(dat)
@@ -173,6 +164,8 @@ def encode(self, dat):
           func_name = u"\u03BB" # Unicode lambda :)
         pretty_name = func_name + '(' + ', '.join(printed_args) + ')'
         new_obj.extend(['FUNCTION', pretty_name, None]) # the final element will be filled in later
+      elif self.is_class(dat) or self.is_instance(dat):
+        self.encode_class_or_instance(dat, new_obj)
       else:
         typeStr = str(typ)
         m = typeRE.match(typeStr)
@@ -181,3 +174,41 @@ def encode(self, dat):
 
       return ret
 
+
+  def is_class(self, dat):
+    """Return whether dat is a class."""
+    if is_python3:
+      return isinstance(dat, type)
+    else:
+      return type(dat) in (types.ClassType, types.TypeType)
+
+
+  def is_instance(self, dat):
+    """Return whether dat is an instance of a class."""
+    if is_python3:
+      return isinstance(type(dat), type) and not isinstance(dat, type)
+    else:
+      # ugh, classRE match is a bit of a hack :(
+      return type(dat) == types.InstanceType or classRE.match(str(type(dat)))
+
+
+  def encode_class_or_instance(self, dat, new_obj):
+    """Encode dat as a class or instance."""
+    if self.is_instance(dat):
+      new_obj.extend(['INSTANCE', get_name(dat.__class__)])
+    else:
+      superclass_names = [e.__name__ for e in dat.__bases__ if e is not object]
+      new_obj.extend(['CLASS', get_name(dat), superclass_names])
+
+    # traverse inside of its __dict__ to grab attributes
+    # (filter out useless-seeming ones):
+    hidden = ('__doc__', '__module__', '__return__', '__dict__',
+        '__locals__', '__weakref__')
+    if hasattr(dat, '__dict__'):
+      user_attrs = sorted([e for e in dat.__dict__ if e not in hidden])
+    else:
+      user_attrs = []
+
+    for attr in user_attrs:
+      new_obj.append([self.encode(attr), self.encode(dat.__dict__[attr])])
+
diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index 8ec958967..113ad852b 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -128,7 +128,6 @@ def __init__(self, finalizer_func):
     # to make an educated guess based on the contents of local
     # variables inherited from possible parent frame candidates.
     def get_parent_frame(self, frame):
-      # TODO(denero) Is this true in Python 3?!?
       for (func_obj, parent_frame) in self.closures.items():
         # ok, there's a possible match, but let's compare the
         # local variables in parent_frame to those of frame
@@ -280,7 +279,6 @@ def create_encoded_stack_entry(cur_frame):
             for pid in parent_frame_id_list:
               parent_frame = self.lookup_zombie_frame_by_id(pid)
               if k in parent_frame.f_locals:
-                # TODO(denero) Check Python3
                 # ignore __return__, which is never copied
                 if k != '__return__':
                   # these values SHOULD BE ALIASES
@@ -298,7 +296,6 @@ def create_encoded_stack_entry(cur_frame):
             encoded_val = self.encoder.encode(v)
 
             # UGH, this is SUPER ugly but needed for nested function defs
-            # TODO(denero) Is this true in Python 3?!?
             if type(v) in (types.FunctionType, types.MethodType):
               try:
                 enclosing_frame = self.closures[v]

From a4b19af50bbf90fd283392004992f4ff400b8e1c Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 10 Aug 2012 14:00:28 -0700
Subject: [PATCH 102/502] minor UI tweaks

---
 PyTutorGAE/css/pytutor.css | 3 ++-
 PyTutorGAE/js/pytutor.js   | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index 286de2ab6..0913ff9e2 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -163,7 +163,8 @@ table.frameDataViz td.val {
 
 div#pyCodeOutputDiv {
   max-width: 550px;
-  max-height: 620px;
+  max-height: 450px;
+  /*max-height: 620px;*/
   overflow: auto;
   /*margin-bottom: 4px;*/
 }
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 41b08397b..a2ec1bcc6 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -125,7 +125,7 @@ ExecutionVisualizer.prototype.render = function() {
             \
           
\
           
\
-            Click to focus and then use the left and right arrow keys to
\
+            Click here to focus and then use the left and right arrow keys to
\
             step through execution. Click on lines of code to set breakpoints.\
           
\
           
\

From 772dcb92313bfea6912fa9fc52fa907f06ad1dc9 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 10 Aug 2012 14:57:21 -0700
Subject: [PATCH 103/502] sharpen up heap objects to prep for animations

---
 PyTutorGAE/css/pytutor.css |  7 +++++--
 PyTutorGAE/js/pytutor.js   | 14 +++++++++++++-
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index 0913ff9e2..a32d35844 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -562,8 +562,11 @@ div#heap {
 }
 
 td.toplevelHeapObject {
-  padding-left: 0px;
-  padding-right: 20px;
+  margin-left: 0px;
+  margin-right: 20px;
+
+  padding: 8px;
+  border: 2px dotted white; /* to make room for transition animations */
 }
 
 table.heapRow {
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index a2ec1bcc6..ba6008fb2 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1201,6 +1201,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   heapRows.enter().append('table')
     //.each(function(objLst, i) {console.log('NEW ROW:', objLst, i);})
     .attr('class', 'heapRow')
+    .append('tr')
     .selectAll('td')
     .data(function(d, i) {return d.slice(1, d.length);}, /* map over each row, skipping row ID tag */
           function(objID) {return objID;} /* each object ID is unique for constancy */)
@@ -1212,7 +1213,18 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
       // TODO: add a smoother transition in the future
       renderCompoundObject(objID, $(this), true);
-    });
+    })
+    /*
+    .transition()
+    .style('border-color', 'red')
+    .duration(100)
+    .transition()
+    .style('border-color', 'white')
+    .delay(100)
+    .duration(600)
+    */
+
+
 
   // remove deleted rows
   heapRows.exit()

From 032d06426113142a1b5fc6ff1adbeba808d557b3 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 10 Aug 2012 15:53:47 -0700
Subject: [PATCH 104/502] simple heap transition animations

---
 PyTutorGAE/css/pytutor.css |  7 ++--
 PyTutorGAE/js/pytutor.js   | 67 +++++++++++++++-----------------------
 2 files changed, 30 insertions(+), 44 deletions(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index a32d35844..ded26ab65 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -562,11 +562,10 @@ div#heap {
 }
 
 td.toplevelHeapObject {
-  margin-left: 0px;
-  margin-right: 20px;
-
+  /* to make room for transition animations */
   padding: 8px;
-  border: 2px dotted white; /* to make room for transition animations */
+  border: 2px dotted white;
+  border-color: white; /* needed for d3 to do transitions */
 }
 
 table.heapRow {
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index ba6008fb2..c6609376e 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1156,6 +1156,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   });
 
 
+
   // use d3 to render the heap by mapping curToplevelLayout into 
\
-                
\
+                
\
                   
Frames
\
                 
\
+                
\
+                
\
               
\
                 
\
@@ -168,7 +170,8 @@ ExecutionVisualizer.prototype.render = function() {
 
 
   // create a persistent globals frame
-  this.domRoot.find("#stack").append('
Global variables
');
@@ -1548,6 +1551,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
     });
 
+  // EXIT
   globalsD3.exit()
     .remove();
 
@@ -1568,6 +1572,73 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   */
 
 
+  var stackD3 = d3.select('#stack')
+    .selectAll('div')
+    .data(curEntry.stack_to_render, function(d, i) {
+      // use a frankenstein combination of function name, zombie status, and INDEX as the key,
+      // to properly handle closures and recursive calls of the same function
+      return d.func_name + '_' + d.is_zombie + '_' + i;
+    });
+ 
+  // ENTER
+  stackD3.enter()
+    .append('div')
+    .attr('class', function(d, i) {return d.is_zombie ? 'zombieStackFrame' : 'stackFrame';})
+    .attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack" + i) : myViz.generateID("stack" + i);})
+
+
+  // remember that the enter selection is added to the update
+  // selection so that we can process it later ...
+
+  // UPDATE
+  stackD3.order() // VERY IMPORTANT to put in the order corresponding to data elements
+    .append('div')
+    .attr('class', 'stackFrameHeader')
+    .attr('id', function(d, i) {
+      return d.is_zombie ? myViz.generateID("zombie_stack_header" + i) : myViz.generateID("stack_header" + i);
+    })
+    .html(function(frame, i) {
+      console.log('UPDATE', frame.func_name);
+
+      var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
+
+      var headerLabel = funcName + '()';
+
+      var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
+      if (frameID) {
+        headerLabel = 'f' + frameID + ': ' + headerLabel;
+      }
+
+      // optional (btw, this isn't a CSS id)
+      if (frame.parent_frame_id_list.length > 0) {
+        var parentFrameID = frame.parent_frame_id_list[0];
+        headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
+      }
+
+      return headerLabel;
+    })
+    .append('table')
+    .attr('class', 'stackFrameVarTable')
+    .selectAll('tr')
+    .data(function(frame, i) {
+      // each list element contains a reference to the entire frame object as well as the variable name
+      // TODO: look into whether we can use d3 parent nodes to avoid this hack ... http://bost.ocks.org/mike/nest/
+      return frame.ordered_varnames.map(function(e) {return [e, frame];});
+    })
+    .enter()
+    .append('tr')
+    .append('td')
+    .html(function(d, i) {
+      var varname = d[0];
+      var frame = d[1];
+      return varname + '_' + frame.func_name;
+    })
+
+  // EXIT
+  stackD3.exit()
+    .remove()
+
+
   function renderStackFrame(frame, ind, is_zombie) {
     var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
     var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)

From 809ed40e0bb736a4afe172750b3f577b13a18d7a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 13:04:05 -0700
Subject: [PATCH 075/502] works for some voodoo mysterious reason

---
 PyTutorGAE/js/pytutor.js | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 912eea0d4..8707667ab 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1585,18 +1585,17 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .append('div')
     .attr('class', function(d, i) {return d.is_zombie ? 'zombieStackFrame' : 'stackFrame';})
     .attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack" + i) : myViz.generateID("stack" + i);})
-
+    .append('div')
+    .attr('class', 'stackFrameHeader')
+    .attr('id', function(d, i) {
+      return d.is_zombie ? myViz.generateID("zombie_stack_header" + i) : myViz.generateID("stack_header" + i);
+    })
 
   // remember that the enter selection is added to the update
   // selection so that we can process it later ...
 
   // UPDATE
   stackD3.order() // VERY IMPORTANT to put in the order corresponding to data elements
-    .append('div')
-    .attr('class', 'stackFrameHeader')
-    .attr('id', function(d, i) {
-      return d.is_zombie ? myViz.generateID("zombie_stack_header" + i) : myViz.generateID("stack_header" + i);
-    })
     .html(function(frame, i) {
       console.log('UPDATE', frame.func_name);
 
@@ -1617,6 +1616,8 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
       return headerLabel;
     })
+
+  var stackFrameTable = stackD3
     .append('table')
     .attr('class', 'stackFrameVarTable')
     .selectAll('tr')
@@ -1624,8 +1625,11 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       // each list element contains a reference to the entire frame object as well as the variable name
       // TODO: look into whether we can use d3 parent nodes to avoid this hack ... http://bost.ocks.org/mike/nest/
       return frame.ordered_varnames.map(function(e) {return [e, frame];});
-    })
-    .enter()
+      },
+      function(d) {return d[0];} // use variable name as key
+    );
+
+  stackFrameTable.enter()
     .append('tr')
     .append('td')
     .html(function(d, i) {

From 62c624a1714e3c62865433e30c1a69aa610f238f Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 13:36:49 -0700
Subject: [PATCH 076/502] more frankenstein like stuff

---
 PyTutorGAE/js/pytutor.js | 50 ++++++++++++++++++++++------------------
 1 file changed, 27 insertions(+), 23 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 8707667ab..f943c6acf 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1574,33 +1574,24 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   var stackD3 = d3.select('#stack')
     .selectAll('div')
-    .data(curEntry.stack_to_render, function(d, i) {
-      // use a frankenstein combination of function name, zombie status, and INDEX as the key,
-      // to properly handle closures and recursive calls of the same function
-      return d.func_name + '_' + d.is_zombie + '_' + i;
+    .data(curEntry.stack_to_render, function(frame, i) {
+      // use a frankenstein combination of frame identifiers and also the INDEX (stack position)
+      // as the join key, to properly handle closures and recursive calls of the same function
+      return frame.func_name + '_' + String(frame.is_zombie) + '_' + String(frame.frame_id) + '_' + String(frame.parent_frame_id_list) + '_' + i;
     });
  
-  // ENTER
+  // ENTER - create a new stack frame div for each entry in curEntry.stack_to_render
   stackD3.enter()
     .append('div')
     .attr('class', function(d, i) {return d.is_zombie ? 'zombieStackFrame' : 'stackFrame';})
     .attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack" + i) : myViz.generateID("stack" + i);})
-    .append('div')
-    .attr('class', 'stackFrameHeader')
-    .attr('id', function(d, i) {
-      return d.is_zombie ? myViz.generateID("zombie_stack_header" + i) : myViz.generateID("stack_header" + i);
-    })
-
-  // remember that the enter selection is added to the update
-  // selection so that we can process it later ...
 
-  // UPDATE
-  stackD3.order() // VERY IMPORTANT to put in the order corresponding to data elements
+  // UPDATE:
+  stackD3.append('div')
+    .attr('class', 'stackFrameHeader')
+    .attr('id', function(frame, i) {return frame.is_zombie ? myViz.generateID("zombie_stack_header" + i) : myViz.generateID("stack_header" + i);})
     .html(function(frame, i) {
-      console.log('UPDATE', frame.func_name);
-
       var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
-
       var headerLabel = funcName + '()';
 
       var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
@@ -1615,11 +1606,15 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       }
 
       return headerLabel;
-    })
+    });
 
-  var stackFrameTable = stackD3
-    .append('table')
-    .attr('class', 'stackFrameVarTable')
+
+  // remember that the enter selection is added to the update
+  // selection so that we can process it later ...
+
+  /*
+  var stackFrameTable = stackD3.order()
+    .select('.stackFrameVarTable')
     .selectAll('tr')
     .data(function(frame, i) {
       // each list element contains a reference to the entire frame object as well as the variable name
@@ -1629,16 +1624,25 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       function(d) {return d[0];} // use variable name as key
     );
 
+  // ENTER - stack frame variables table
   stackFrameTable.enter()
     .append('tr')
     .append('td')
+
+  // UPDATE - stack frame variables table
+  stackFrameTable
     .html(function(d, i) {
       var varname = d[0];
       var frame = d[1];
       return varname + '_' + frame.func_name;
     })
 
-  // EXIT
+  // EXIT - stack frame variables table
+  stackFrameTable.exit()
+    .remove
+  */
+
+  // EXIT - stack frame
   stackD3.exit()
     .remove()
 

From dde40fe38ac167a1c5d54e77949a3ab35c7e15d0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 13:57:49 -0700
Subject: [PATCH 077/502] the basics sorta work

---
 PyTutorGAE/js/pytutor.js | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index f943c6acf..dd1adf182 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1577,17 +1577,23 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .data(curEntry.stack_to_render, function(frame, i) {
       // use a frankenstein combination of frame identifiers and also the INDEX (stack position)
       // as the join key, to properly handle closures and recursive calls of the same function
-      return frame.func_name + '_' + String(frame.is_zombie) + '_' + String(frame.frame_id) + '_' + String(frame.parent_frame_id_list) + '_' + i;
+      return frame.func_name + '_' + String(frame.frame_id) + '_' + String(frame.parent_frame_id_list) + '_' + String(frame.is_zombie) + '_' + i;
     });
  
   // ENTER - create a new stack frame div for each entry in curEntry.stack_to_render
   stackD3.enter()
     .append('div')
+    .each(function(frame, i) {
+      console.log('APPEND DIV', (frame.func_name + '_' + String(frame.frame_id) + '_' + String(frame.parent_frame_id_list) + '_' + i));
+    })
     .attr('class', function(d, i) {return d.is_zombie ? 'zombieStackFrame' : 'stackFrame';})
     .attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack" + i) : myViz.generateID("stack" + i);})
 
+  /*
   // UPDATE:
-  stackD3.append('div')
+  var stackFrameTable = stackD3
+    .order()  // VERY IMPORTANT to put in the order corresponding to data elements
+    .append('div')
     .attr('class', 'stackFrameHeader')
     .attr('id', function(frame, i) {return frame.is_zombie ? myViz.generateID("zombie_stack_header" + i) : myViz.generateID("stack_header" + i);})
     .html(function(frame, i) {
@@ -1607,10 +1613,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
       return headerLabel;
     });
-
-
-  // remember that the enter selection is added to the update
-  // selection so that we can process it later ...
+  */
 
   /*
   var stackFrameTable = stackD3.order()

From 5d2e8521479b5c2f0a81d020483b304e36f12a61 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 14:13:59 -0700
Subject: [PATCH 078/502] something is up ?!?

---
 PyTutorGAE/js/pytutor.js | 57 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 54 insertions(+), 3 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index dd1adf182..bb49e8a57 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1581,13 +1581,64 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     });
  
   // ENTER - create a new stack frame div for each entry in curEntry.stack_to_render
-  stackD3.enter()
-    .append('div')
+  var stackEnter = stackD3.enter();
+
+  var stackFrame = stackEnter.append('div')
     .each(function(frame, i) {
       console.log('APPEND DIV', (frame.func_name + '_' + String(frame.frame_id) + '_' + String(frame.parent_frame_id_list) + '_' + i));
     })
     .attr('class', function(d, i) {return d.is_zombie ? 'zombieStackFrame' : 'stackFrame';})
-    .attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack" + i) : myViz.generateID("stack" + i);})
+    .attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack" + i) : myViz.generateID("stack" + i);});
+
+  var stackVarsTable = stackFrame
+    .selectAll('li')
+    .data(function(frame, i) {
+      // each list element contains a reference to the entire frame object as well as the variable name
+      // TODO: look into whether we can use d3 parent nodes to avoid this hack ... http://bost.ocks.org/mike/nest/
+      return frame.ordered_varnames.map(function(e) {return [e, frame];});
+      },
+      function(d) {return d[0];} // use variable name as key
+    );
+
+  stackVarsTable
+    .enter()
+    .append('li');
+
+  stackVarsTable
+    .html(function(d, i) {
+      var varname = d[0];
+      var frame = d[1];
+      return varname + '_' + frame.func_name;
+    });
+
+  stackVarsTable.exit().remove();
+
+
+  /*
+  stackFrame.enter()
+    .append('div')
+    .attr('class', 'stackFrameHeader')
+    .attr('id', function(frame, i) {return frame.is_zombie ? myViz.generateID("zombie_stack_header" + i) : myViz.generateID("stack_header" + i);})
+    .html(function(frame, i) {
+      var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
+      var headerLabel = funcName + '()';
+
+      var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
+      if (frameID) {
+        headerLabel = 'f' + frameID + ': ' + headerLabel;
+      }
+
+      // optional (btw, this isn't a CSS id)
+      if (frame.parent_frame_id_list.length > 0) {
+        var parentFrameID = frame.parent_frame_id_list[0];
+        headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
+      }
+
+      return headerLabel;
+    });
+  */
+
+
 
   /*
   // UPDATE:

From 5d097dacc92bc0f4baa836d198dff49a1470028b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 15:23:09 -0700
Subject: [PATCH 079/502] works slightly better

---
 PyTutorGAE/js/pytutor.js | 34 ++++++++++++++--------------------
 1 file changed, 14 insertions(+), 20 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index bb49e8a57..581edf665 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1572,27 +1572,26 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   */
 
 
-  var stackD3 = d3.select('#stack')
-    .selectAll('div')
+  var stackDiv = myViz.domRootD3.select('#stack');
+
+  var stackFrameDiv = stackDiv.selectAll('div')
     .data(curEntry.stack_to_render, function(frame, i) {
       // use a frankenstein combination of frame identifiers and also the INDEX (stack position)
       // as the join key, to properly handle closures and recursive calls of the same function
       return frame.func_name + '_' + String(frame.frame_id) + '_' + String(frame.parent_frame_id_list) + '_' + String(frame.is_zombie) + '_' + i;
     });
- 
-  // ENTER - create a new stack frame div for each entry in curEntry.stack_to_render
-  var stackEnter = stackD3.enter();
 
-  var stackFrame = stackEnter.append('div')
-    .each(function(frame, i) {
-      console.log('APPEND DIV', (frame.func_name + '_' + String(frame.frame_id) + '_' + String(frame.parent_frame_id_list) + '_' + i));
-    })
+  stackFrameDiv.enter().append('div')
     .attr('class', function(d, i) {return d.is_zombie ? 'zombieStackFrame' : 'stackFrame';})
     .attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack" + i) : myViz.generateID("stack" + i);});
 
-  var stackVarsTable = stackFrame
+
+  var stackVarTable = stackFrameDiv
+    .each(function(frame, i) {
+      console.log('ENTER/UPDATE DIV', (frame.func_name + '_' + String(frame.frame_id) + '_' + String(frame.parent_frame_id_list) + '_' + i));
+    })
     .selectAll('li')
-    .data(function(frame, i) {
+    .data(function(frame) {
       // each list element contains a reference to the entire frame object as well as the variable name
       // TODO: look into whether we can use d3 parent nodes to avoid this hack ... http://bost.ocks.org/mike/nest/
       return frame.ordered_varnames.map(function(e) {return [e, frame];});
@@ -1600,19 +1599,18 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       function(d) {return d[0];} // use variable name as key
     );
 
-  stackVarsTable
+  stackVarTable
     .enter()
-    .append('li');
-
-  stackVarsTable
+    .append('li')
     .html(function(d, i) {
       var varname = d[0];
       var frame = d[1];
       return varname + '_' + frame.func_name;
     });
 
-  stackVarsTable.exit().remove();
+  stackVarTable.exit().remove();
 
+  stackFrameDiv.exit().remove();
 
   /*
   stackFrame.enter()
@@ -1696,10 +1694,6 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .remove
   */
 
-  // EXIT - stack frame
-  stackD3.exit()
-    .remove()
-
 
   function renderStackFrame(frame, ind, is_zombie) {
     var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 

From 5b09f1e74e9a394d3996a8b48418da9bed2d9303 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 15:40:46 -0700
Subject: [PATCH 080/502] OMFG

---
 PyTutorGAE/js/pytutor.js | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 581edf665..b6b763f2b 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1586,7 +1586,33 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack" + i) : myViz.generateID("stack" + i);});
 
 
-  var stackVarTable = stackFrameDiv
+  stackFrameDiv
+    .append('div')
+    .attr('class', 'stackFrameHeader')
+    .html(function(frame, i) {
+      var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
+      var headerLabel = funcName + '()';
+
+      var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
+      if (frameID) {
+        headerLabel = 'f' + frameID + ': ' + headerLabel;
+      }
+
+      // optional (btw, this isn't a CSS id)
+      if (frame.parent_frame_id_list.length > 0) {
+        var parentFrameID = frame.parent_frame_id_list[0];
+        headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
+      }
+
+      return headerLabel;
+    });
+
+
+  stackFrameDiv
+    .append('div')
+    .attr('class', 'derrrr')
+
+  var stackVarTable = stackFrameDiv.select('div.derrrr')
     .each(function(frame, i) {
       console.log('ENTER/UPDATE DIV', (frame.func_name + '_' + String(frame.frame_id) + '_' + String(frame.parent_frame_id_list) + '_' + i));
     })
@@ -1602,6 +1628,8 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   stackVarTable
     .enter()
     .append('li')
+
+  stackVarTable
     .html(function(d, i) {
       var varname = d[0];
       var frame = d[1];
@@ -1610,6 +1638,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   stackVarTable.exit().remove();
 
+
   stackFrameDiv.exit().remove();
 
   /*

From 3352907d26159b480d2c0af89eddd3347dea3861 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 16:39:14 -0700
Subject: [PATCH 081/502] added a unique_hash field to the trace o.O

---
 PyTutorGAE/js/pytutor.js | 28 ++++++++++++++++++++--------
 PyTutorGAE/pg_logger.py  | 18 ++++++++++++++++++
 2 files changed, 38 insertions(+), 8 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index b6b763f2b..6b0a5df0d 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1102,7 +1102,6 @@ ExecutionVisualizer.prototype.precomputeCurTraceLayouts = function() {
 }
 
 
-
 // The "3.0" version of renderDataStructures renders variables in
 // a stack, values in a separate heap, and draws line connectors
 // to represent both stack->heap object references and, more importantly,
@@ -1575,18 +1574,27 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   var stackDiv = myViz.domRootD3.select('#stack');
 
   var stackFrameDiv = stackDiv.selectAll('div')
-    .data(curEntry.stack_to_render, function(frame, i) {
-      // use a frankenstein combination of frame identifiers and also the INDEX (stack position)
-      // as the join key, to properly handle closures and recursive calls of the same function
-      return frame.func_name + '_' + String(frame.frame_id) + '_' + String(frame.parent_frame_id_list) + '_' + String(frame.is_zombie) + '_' + i;
+    .data(curEntry.stack_to_render, function(frame) {
+      return frame.unique_hash; // VERY IMPORTANT for properly handling closures and nested functions
     });
 
   stackFrameDiv.enter().append('div')
     .attr('class', function(d, i) {return d.is_zombie ? 'zombieStackFrame' : 'stackFrame';})
-    .attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack" + i) : myViz.generateID("stack" + i);});
+    //.attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack_" + htmlspecialchars(d.unique_hash))
+    //                                               : myViz.generateID("stack_" + htmlspecialchars(d.unique_hash));
+    //})
+    .attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack" + i)
+                                                   : myViz.generateID("stack" + i);
+    })
 
 
+
+  /*
+  // I suspect I need to use .order() somewhere, but I can't seem to get it in the right place :(
   stackFrameDiv
+    .each(function(frame, i) {
+      console.log('UPDATE stackFrameDiv', frame.unique_hash);
+    })
     .append('div')
     .attr('class', 'stackFrameHeader')
     .html(function(frame, i) {
@@ -1605,9 +1613,13 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       }
 
       return headerLabel;
-    });
+    })
+  */
+
+  stackFrameDiv.exit().remove();
 
 
+  /*
   stackFrameDiv
     .append('div')
     .attr('class', 'derrrr')
@@ -1637,9 +1649,9 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     });
 
   stackVarTable.exit().remove();
+  */
 
 
-  stackFrameDiv.exit().remove();
 
   /*
   stackFrame.enter()
diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index 84988b929..88ce6e2e0 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -436,6 +436,24 @@ def create_encoded_stack_entry(cur_frame):
 
           stack_to_render.insert(j, e)
 
+        # create a unique hash for this stack entry, so that the
+        # frontend can uniquely identify it when doing incremental
+        # rendering. the strategy is to use a frankenstein-like mix of the
+        # relevant fields to properly disambiguate closures and recursive
+        # calls to the same function (stack_index is key for
+        # disambiguating recursion!)
+        for (stack_index, e) in enumerate(stack_to_render):
+          hash_str = e['func_name']
+          if e['frame_id']:
+            hash_str += '_f' + str(e['frame_id'])
+          if e['parent_frame_id_list']:
+            hash_str += '_p' + '_'.join([str(i) for i in e['parent_frame_id_list']])
+          if e['is_zombie']:
+            hash_str += '_z'
+          hash_str += '_i' + str(stack_index)
+
+          e['unique_hash'] = hash_str
+
 
         trace_entry = dict(line=lineno,
                            event=event_type,

From 11ddd4f668cc9139becaaff103d8993544210a13 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 17:07:35 -0700
Subject: [PATCH 082/502] something simple that sorta works, maybe patch up
 lata?

---
 PyTutorGAE/js/pytutor.js | 124 ++++++---------------------------------
 1 file changed, 19 insertions(+), 105 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 6b0a5df0d..de2179807 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1585,50 +1585,9 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     //})
     .attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack" + i)
                                                    : myViz.generateID("stack" + i);
-    })
-
-
-
-  /*
-  // I suspect I need to use .order() somewhere, but I can't seem to get it in the right place :(
-  stackFrameDiv
-    .each(function(frame, i) {
-      console.log('UPDATE stackFrameDiv', frame.unique_hash);
-    })
-    .append('div')
-    .attr('class', 'stackFrameHeader')
-    .html(function(frame, i) {
-      var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
-      var headerLabel = funcName + '()';
-
-      var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
-      if (frameID) {
-        headerLabel = 'f' + frameID + ': ' + headerLabel;
-      }
-
-      // optional (btw, this isn't a CSS id)
-      if (frame.parent_frame_id_list.length > 0) {
-        var parentFrameID = frame.parent_frame_id_list[0];
-        headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
-      }
-
-      return headerLabel;
-    })
-  */
-
-  stackFrameDiv.exit().remove();
-
-
-  /*
-  stackFrameDiv
-    .append('div')
-    .attr('class', 'derrrr')
-
-  var stackVarTable = stackFrameDiv.select('div.derrrr')
-    .each(function(frame, i) {
-      console.log('ENTER/UPDATE DIV', (frame.func_name + '_' + String(frame.frame_id) + '_' + String(frame.parent_frame_id_list) + '_' + i));
-    })
-    .selectAll('li')
+    });
+ 
+  var stackVarTable = stackFrameDiv.selectAll('li')
     .data(function(frame) {
       // each list element contains a reference to the entire frame object as well as the variable name
       // TODO: look into whether we can use d3 parent nodes to avoid this hack ... http://bost.ocks.org/mike/nest/
@@ -1645,20 +1604,18 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .html(function(d, i) {
       var varname = d[0];
       var frame = d[1];
-      return varname + '_' + frame.func_name;
+      return varname;
     });
 
   stackVarTable.exit().remove();
-  */
-
 
 
   /*
-  stackFrame.enter()
+  stackFrameDiv.select('div')
+    .data(function
     .append('div')
     .attr('class', 'stackFrameHeader')
-    .attr('id', function(frame, i) {return frame.is_zombie ? myViz.generateID("zombie_stack_header" + i) : myViz.generateID("stack_header" + i);})
-    .html(function(frame, i) {
+    .text(function(frame, i) {
       var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
       var headerLabel = funcName + '()';
 
@@ -1674,66 +1631,21 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       }
 
       return headerLabel;
-    });
-  */
-
-
-
-  /*
-  // UPDATE:
-  var stackFrameTable = stackD3
-    .order()  // VERY IMPORTANT to put in the order corresponding to data elements
-    .append('div')
-    .attr('class', 'stackFrameHeader')
-    .attr('id', function(frame, i) {return frame.is_zombie ? myViz.generateID("zombie_stack_header" + i) : myViz.generateID("stack_header" + i);})
-    .html(function(frame, i) {
-      var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
-      var headerLabel = funcName + '()';
-
-      var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
-      if (frameID) {
-        headerLabel = 'f' + frameID + ': ' + headerLabel;
-      }
-
-      // optional (btw, this isn't a CSS id)
-      if (frame.parent_frame_id_list.length > 0) {
-        var parentFrameID = frame.parent_frame_id_list[0];
-        headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
-      }
-
-      return headerLabel;
-    });
+    })
+    .each(function(frame, i) {
+      console.log('ENTER stackFrameDiv', frame.unique_hash, i);
+    })
   */
 
-  /*
-  var stackFrameTable = stackD3.order()
-    .select('.stackFrameVarTable')
-    .selectAll('tr')
-    .data(function(frame, i) {
-      // each list element contains a reference to the entire frame object as well as the variable name
-      // TODO: look into whether we can use d3 parent nodes to avoid this hack ... http://bost.ocks.org/mike/nest/
-      return frame.ordered_varnames.map(function(e) {return [e, frame];});
-      },
-      function(d) {return d[0];} // use variable name as key
-    );
-
-  // ENTER - stack frame variables table
-  stackFrameTable.enter()
-    .append('tr')
-    .append('td')
 
-  // UPDATE - stack frame variables table
-  stackFrameTable
-    .html(function(d, i) {
-      var varname = d[0];
-      var frame = d[1];
-      return varname + '_' + frame.func_name;
+  // I suspect I need to use .order() somewhere, but I can't seem to get it in the right place :(
+  stackFrameDiv
+    .each(function(frame, i) {
+      console.log('UPDATE stackFrameDiv', frame.unique_hash, i);
     })
 
-  // EXIT - stack frame variables table
-  stackFrameTable.exit()
-    .remove
-  */
+  stackFrameDiv.exit().remove();
+
 
 
   function renderStackFrame(frame, ind, is_zombie) {
@@ -1872,6 +1784,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
 
   // highlight the top-most non-zombie stack frame or, if not available, globals
+  /*
   var frame_already_highlighted = false;
   $.each(curEntry.stack_to_render, function(i, e) {
     if (e.is_highlighted) {
@@ -1883,6 +1796,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   if (!frame_already_highlighted) {
     highlight_frame(myViz.generateID('globals'));
   }
+  */
 
 }
 

From ef1d0849605f5e7c505a03797b4b5d6ea1495222 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 17:25:14 -0700
Subject: [PATCH 083/502] AHHH

---
 PyTutorGAE/js/pytutor.js | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index de2179807..abf19b437 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1580,14 +1580,11 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   stackFrameDiv.enter().append('div')
     .attr('class', function(d, i) {return d.is_zombie ? 'zombieStackFrame' : 'stackFrame';})
-    //.attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack_" + htmlspecialchars(d.unique_hash))
-    //                                               : myViz.generateID("stack_" + htmlspecialchars(d.unique_hash));
-    //})
     .attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack" + i)
                                                    : myViz.generateID("stack" + i);
     });
  
-  var stackVarTable = stackFrameDiv.selectAll('li')
+  var stackVarTable = stackFrameDiv.selectAll('table tr' /* MULTI-LEVEL SELECTIONS!!! GAHHHH!!! */)
     .data(function(frame) {
       // each list element contains a reference to the entire frame object as well as the variable name
       // TODO: look into whether we can use d3 parent nodes to avoid this hack ... http://bost.ocks.org/mike/nest/
@@ -1598,9 +1595,17 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   stackVarTable
     .enter()
-    .append('li')
+    .append('tr')
 
-  stackVarTable
+  
+  var stackVarTableCells = stackVarTable
+    .selectAll('td')
+    .data(function(d, i) {return [d, d] /* map identical data down both columns */;})
+
+  stackVarTableCells.enter()
+    .append('td')
+
+  stackVarTableCells
     .html(function(d, i) {
       var varname = d[0];
       var frame = d[1];

From b61d7f209686b000176cabd4663059eaf85b1dea Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 17:41:42 -0700
Subject: [PATCH 084/502] sorta works now

---
 PyTutorGAE/js/pytutor.js | 29 ++++++++++++++++++-----------
 1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index abf19b437..1508d77d9 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1596,7 +1596,6 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   stackVarTable
     .enter()
     .append('tr')
-
   
   var stackVarTableCells = stackVarTable
     .selectAll('td')
@@ -1609,12 +1608,29 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .html(function(d, i) {
       var varname = d[0];
       var frame = d[1];
-      return varname;
+      if (i == 0) {
+        return varname;
+      }
+      else {
+        return frame.encoded_locals[varname];
+      }
     });
 
+  stackVarTableCells.exit().remove();
+
   stackVarTable.exit().remove();
 
 
+  // I suspect I need to use .order() somewhere, but I can't seem to get it in the right place :(
+  stackFrameDiv
+    .each(function(frame, i) {
+      console.log('UPDATE stackFrameDiv', frame.unique_hash, i);
+    })
+
+  stackFrameDiv.exit().remove();
+
+
+
   /*
   stackFrameDiv.select('div')
     .data(function
@@ -1643,15 +1659,6 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   */
 
 
-  // I suspect I need to use .order() somewhere, but I can't seem to get it in the right place :(
-  stackFrameDiv
-    .each(function(frame, i) {
-      console.log('UPDATE stackFrameDiv', frame.unique_hash, i);
-    })
-
-  stackFrameDiv.exit().remove();
-
-
 
   function renderStackFrame(frame, ind, is_zombie) {
     var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 

From 58e6ede234a250598d28ff7827a3242c55cd0969 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 18:28:57 -0700
Subject: [PATCH 085/502] krazy

---
 PyTutorGAE/css/pytutor.css |   1 +
 PyTutorGAE/js/pytutor.js   | 139 +++++++++++++++++++++++++------------
 2 files changed, 95 insertions(+), 45 deletions(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index 8ab3d6ff5..286de2ab6 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -301,6 +301,7 @@ button.smallBtn {
 .retval,
 .returnWarning {
   font-size: 9pt;
+  color: #9d1e18;
 }
 
 .returnWarning {
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 1508d77d9..385ffb840 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1534,7 +1534,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
             // make sure varname doesn't contain any weird
             // characters that are illegal for CSS ID's ...
             var varDivID = myViz.generateID('global__' + varnameToCssID(varname));
-            $(this).append('
 
');
+            $(this).append(' ');
 
             assert(!connectionEndpointIDs.has(varDivID));
             var heapObjID = myViz.generateID('heap_object_' + getRefID(val));
@@ -1564,12 +1564,6 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   }
 
 
-  /*
-  $.each(curEntry.stack_to_render, function(i, e) {
-    renderStackFrame(e, i, e.is_zombie);
-  });
-  */
-
 
   var stackDiv = myViz.domRootD3.select('#stack');
 
@@ -1578,17 +1572,47 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       return frame.unique_hash; // VERY IMPORTANT for properly handling closures and nested functions
     });
 
-  stackFrameDiv.enter().append('div')
+  stackFrameDiv.enter()
+    .append('div')
     .attr('class', function(d, i) {return d.is_zombie ? 'zombieStackFrame' : 'stackFrame';})
     .attr('id', function(d, i) {return d.is_zombie ? myViz.generateID("zombie_stack" + i)
                                                    : myViz.generateID("stack" + i);
+    })
+    //.append('div')
+    //.attr('class', 'stackFrameHeader')
+    // TODO: perhaps this table keeps on getting cleared out since it's done on enter()?!?
+    .append('table')
+    .attr('class', 'stackFrameVarTable')
+
+  
+  /*
+  stackFrameDiv.select('div.stackFrameHeader')
+    .html(function(frame, i) {
+      var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
+      var headerLabel = funcName + '()';
+
+      var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
+      if (frameID) {
+        headerLabel = 'f' + frameID + ': ' + headerLabel;
+      }
+
+      // optional (btw, this isn't a CSS id)
+      if (frame.parent_frame_id_list.length > 0) {
+        var parentFrameID = frame.parent_frame_id_list[0];
+        headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
+      }
+
+      return headerLabel;
     });
+  */
  
-  var stackVarTable = stackFrameDiv.selectAll('table tr' /* MULTI-LEVEL SELECTIONS!!! GAHHHH!!! */)
+  var stackVarTable = stackFrameDiv
+    .order() // VERY IMPORTANT to put in the order corresponding to data elements
+    .select('table').selectAll('tr')
     .data(function(frame) {
       // each list element contains a reference to the entire frame object as well as the variable name
       // TODO: look into whether we can use d3 parent nodes to avoid this hack ... http://bost.ocks.org/mike/nest/
-      return frame.ordered_varnames.map(function(e) {return [e, frame];});
+      return frame.ordered_varnames.map(function(varname) {return [varname, frame];});
       },
       function(d) {return d[0];} // use variable name as key
     );
@@ -1597,6 +1621,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .enter()
     .append('tr')
   
+
   var stackVarTableCells = stackVarTable
     .selectAll('td')
     .data(function(d, i) {return [d, d] /* map identical data down both columns */;})
@@ -1605,58 +1630,77 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .append('td')
 
   stackVarTableCells
+    .order() // VERY IMPORTANT to put in the order corresponding to data elements
+    .attr('class', function(d, i) {return (i == 0) ? 'stackFrameVar' : 'stackFrameValue';})
     .html(function(d, i) {
       var varname = d[0];
       var frame = d[1];
       if (i == 0) {
-        return varname;
+        if (varname == '__return__' && !frame.is_zombie) {
+          return 'Return value'
+        }
+        else {
+          return varname;
+        }
       }
       else {
-        return frame.encoded_locals[varname];
+        return ''; // will update in .each()
       }
-    });
+    })
+    .each(function(d, i) {
+      var varname = d[0];
+      var frame = d[1];
 
-  stackVarTableCells.exit().remove();
+      if (i == 1) {
+        var val = frame.encoded_locals[varname];
 
-  stackVarTable.exit().remove();
+        // include type in repr to prevent conflating integer 5 with string "5"
+        var valStringRepr = String(typeof val) + ':' + String(val);
 
+        // SUPER HACK - retrieve previous value as a hidden attribute
+        var prevValStringRepr = $(this).attr('data-curvalue');
 
-  // I suspect I need to use .order() somewhere, but I can't seem to get it in the right place :(
-  stackFrameDiv
-    .each(function(frame, i) {
-      console.log('UPDATE stackFrameDiv', frame.unique_hash, i);
-    })
+        // IMPORTANT! only clear the div and render a new element if the
+        // value has changed
+        if (valStringRepr != prevValStringRepr) {
+          // TODO: render a transition
 
-  stackFrameDiv.exit().remove();
+          $(this).empty(); // crude but effective for now
 
+          if (isPrimitiveType(val)) {
+            renderPrimitiveObject(val, $(this));
+          }
+          else {
+            // add a stub so that we can connect it with a connector later.
+            // IE needs this div to be NON-EMPTY in order to properly
+            // render jsPlumb endpoints, so that's why we add an " "!
 
+            // make sure varname and frame.unique_hash don't contain any weird
+            // characters that are illegal for CSS ID's ...
+            var varDivID = myViz.generateID(varnameToCssID(frame.unique_hash + '__' + varname));
 
-  /*
-  stackFrameDiv.select('div')
-    .data(function
-    .append('div')
-    .attr('class', 'stackFrameHeader')
-    .text(function(frame, i) {
-      var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
-      var headerLabel = funcName + '()';
+            // creepy - 
 doesn't work here, but  does ... ugh
+            $(this).append(' ');
 
-      var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
-      if (frameID) {
-        headerLabel = 'f' + frameID + ': ' + headerLabel;
-      }
+            assert(!connectionEndpointIDs.has(varDivID));
+            var heapObjID = myViz.generateID('heap_object_' + getRefID(val));
+            connectionEndpointIDs.set(varDivID, heapObjID);
+          }
 
-      // optional (btw, this isn't a CSS id)
-      if (frame.parent_frame_id_list.length > 0) {
-        var parentFrameID = frame.parent_frame_id_list[0];
-        headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
+          console.log('CHANGED', varname, prevValStringRepr, valStringRepr);
+        }
+
+        // SUPER HACK - set current value as a hidden string attribute
+        $(this).attr('data-curvalue', valStringRepr);
       }
+    });
 
-      return headerLabel;
-    })
-    .each(function(frame, i) {
-      console.log('ENTER stackFrameDiv', frame.unique_hash, i);
-    })
-  */
+
+  stackVarTableCells.exit().remove();
+
+  stackVarTable.exit().remove();
+
+  stackFrameDiv.exit().remove();
 
 
 
@@ -1744,6 +1788,13 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     }
   }
 
+  /*
+  $.each(curEntry.stack_to_render, function(i, e) {
+    renderStackFrame(e, i, e.is_zombie);
+  });
+  */
+
+
 
   // finally add all the connectors!
   connectionEndpointIDs.forEach(function(varID, valueID) {
@@ -1796,7 +1847,6 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
 
   // highlight the top-most non-zombie stack frame or, if not available, globals
-  /*
   var frame_already_highlighted = false;
   $.each(curEntry.stack_to_render, function(i, e) {
     if (e.is_highlighted) {
@@ -1808,7 +1858,6 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   if (!frame_already_highlighted) {
     highlight_frame(myViz.generateID('globals'));
   }
-  */
 
 }
 

From 890f23246ed790699964b4940194219e9c5ab9fe Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 9 Aug 2012 21:01:48 -0700
Subject: [PATCH 086/502] cleaned up even more (?!?)

---
 PyTutorGAE/js/pytutor.js | 159 ++++++++++-----------------------------
 1 file changed, 39 insertions(+), 120 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 385ffb840..6f602fa0c 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1541,7 +1541,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
             connectionEndpointIDs.set(varDivID, heapObjID);
           }
 
-          console.log('CHANGED', varname, prevValStringRepr, valStringRepr);
+          //console.log('CHANGED', varname, prevValStringRepr, valStringRepr);
         }
 
         // SUPER HACK - set current value as a hidden string attribute
@@ -1583,58 +1583,44 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     // TODO: perhaps this table keeps on getting cleared out since it's done on enter()?!?
     .append('table')
     .attr('class', 'stackFrameVarTable')
+    .each(function(d, i) {console.log('stackFrameDiv.enter()', d.unique_hash);})
 
-  
-  /*
-  stackFrameDiv.select('div.stackFrameHeader')
-    .html(function(frame, i) {
-      var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
-      var headerLabel = funcName + '()';
-
-      var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
-      if (frameID) {
-        headerLabel = 'f' + frameID + ': ' + headerLabel;
-      }
 
-      // optional (btw, this isn't a CSS id)
-      if (frame.parent_frame_id_list.length > 0) {
-        var parentFrameID = frame.parent_frame_id_list[0];
-        headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
-      }
-
-      return headerLabel;
-    });
-  */
- 
   var stackVarTable = stackFrameDiv
     .order() // VERY IMPORTANT to put in the order corresponding to data elements
+    .each(function(d, i) {console.log('stackFrameDiv.order() POST', d.unique_hash);})
     .select('table').selectAll('tr')
     .data(function(frame) {
-      // each list element contains a reference to the entire frame object as well as the variable name
-      // TODO: look into whether we can use d3 parent nodes to avoid this hack ... http://bost.ocks.org/mike/nest/
-      return frame.ordered_varnames.map(function(varname) {return [varname, frame];});
+        // each list element contains a reference to the entire frame
+        // object as well as the variable name
+        // TODO: look into whether we can use d3 parent nodes to avoid
+        // this hack ... http://bost.ocks.org/mike/nest/
+        return frame.ordered_varnames.map(function(varname) {return {varname:varname, frame:frame};});
       },
-      function(d) {return d[0];} // use variable name as key
+      function(d) {return d.varname;} // use variable name as key
     );
 
   stackVarTable
     .enter()
     .append('tr')
+    .each(function(d, i) {console.log('stackVarTable.enter()', d);})
   
 
   var stackVarTableCells = stackVarTable
     .selectAll('td')
+    .each(function(d, i) {console.log('stackVarTable UPDATE', d, i);})
     .data(function(d, i) {return [d, d] /* map identical data down both columns */;})
 
   stackVarTableCells.enter()
     .append('td')
+    .each(function(d, i) {console.log('stackVarTableCells.enter()', d, i);})
 
   stackVarTableCells
     .order() // VERY IMPORTANT to put in the order corresponding to data elements
     .attr('class', function(d, i) {return (i == 0) ? 'stackFrameVar' : 'stackFrameValue';})
     .html(function(d, i) {
-      var varname = d[0];
-      var frame = d[1];
+      var varname = d.varname;
+      var frame = d.frame;
       if (i == 0) {
         if (varname == '__return__' && !frame.is_zombie) {
           return 'Return value'
@@ -1648,8 +1634,10 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       }
     })
     .each(function(d, i) {
-      var varname = d[0];
-      var frame = d[1];
+      var varname = d.varname;
+      var frame = d.frame;
+
+      console.log('stackVarTableCells.each()', varname, i);
 
       if (i == 1) {
         var val = frame.encoded_locals[varname];
@@ -1687,7 +1675,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
             connectionEndpointIDs.set(varDivID, heapObjID);
           }
 
-          console.log('CHANGED', varname, prevValStringRepr, valStringRepr);
+          //console.log('CHANGED', varname, prevValStringRepr, valStringRepr);
         }
 
         // SUPER HACK - set current value as a hidden string attribute
@@ -1702,98 +1690,29 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   stackFrameDiv.exit().remove();
 
+  // TODO: sometimes mistakenly renders TWICE on, say, closures :(
+  stackFrameDiv
+    .insert('div', ':first-child') // prepend header after the dust settles
+    .attr('class', 'stackFrameHeader')
+    .html(function(frame, i) {
+      var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
+      var headerLabel = funcName + '()';
 
+      var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
+      if (frameID) {
+        headerLabel = 'f' + frameID + ': ' + headerLabel;
+      }
 
-  function renderStackFrame(frame, ind, is_zombie) {
-    var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
-    var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
-
-    // optional (btw, this isn't a CSS id)
-    var parentFrameID = null;
-    if (frame.parent_frame_id_list.length > 0) {
-      parentFrameID = frame.parent_frame_id_list[0];
-    }
-
-    var localVars = frame.encoded_locals
-
-    // the stackFrame div's id is simply its index ("stack")
-
-    var divClass, divID, headerDivID;
-    if (is_zombie) {
-      divClass = 'zombieStackFrame';
-      divID = myViz.generateID("zombie_stack" + ind);
-      headerDivID = myViz.generateID("zombie_stack_header" + ind);
-    }
-    else {
-      divClass = 'stackFrame';
-      divID = myViz.generateID("stack" + ind);
-      headerDivID = myViz.generateID("stack_header" + ind);
-    }
-
-    myViz.domRoot.find("#stack").append('
');
-
-    var headerLabel = funcName + '()';
-    if (frameID) {
-      headerLabel = 'f' + frameID + ': ' + headerLabel;
-    }
-    if (parentFrameID) {
-      headerLabel = headerLabel + ' [parent=f' + parentFrameID + ']';
-    }
-    myViz.domRoot.find("#stack #" + divID).append('
' + headerLabel + '
');
-
-    if (frame.ordered_varnames.length > 0) {
-      var tableID = divID + '_table';
-      myViz.domRoot.find("#stack #" + divID).append('
');
-
-      var tbl = myViz.domRoot.find("#" + tableID);
-
-      $.each(frame.ordered_varnames, function(xxx, varname) {
-        var val = localVars[varname];
-
-        // special treatment for displaying return value and indicating
-        // that the function is about to return to its caller
-        //
-        // DON'T do this for zombie frames
-        if (varname == '__return__' && !is_zombie) {
-          assert(curEntry.event == 'return'); // sanity check
-
-          tbl.append('
About to return
Return value:
' + varname + '

   // and ","
 elements
 
@@ -1166,21 +1167,42 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   });
 
 
+  // insert new heap rows
+  heapRows.enter().append('table')
+    //.each(function(objLst, i) {console.log('NEW ROW:', objLst, i);})
+    .attr('class', 'heapRow')
+    .append('tr')
+
+  // delete a heap row
+  heapRows.exit()
+    //.each(function(objLst, i) {console.log('DEL ROW:', objLst, i);})
+    .remove();
+
+
   // update an existing heap row
   var heapColumns = heapRows
-    //.each(function(objLst, i) { console.log('UPDATE ROW:', objLst, i); })
+    .each(function(objLst, i) { console.log('UPDATE ROW:', objLst, i); })
     .selectAll('td')
     .data(function(d, i) {return d.slice(1, d.length);}, /* map over each row, skipping row ID tag */
           function(objID) {return objID;} /* each object ID is unique for constancy */);
 
-  // ENTER
+  // insert a new toplevelHeapObject
   heapColumns.enter().append('td')
     .attr('class', 'toplevelHeapObject')
-    .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;});
+    .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;})
+    .style('opacity', '0')
+    .style('border-color', 'red')
     // remember that the enter selection is added to the update
     // selection so that we can process it later ...
+    .transition()
+    .style('opacity', '1') /* fade in */
+    .duration(500)
+    .transition()
+    .style('border-color', 'white')
+    .delay(500)
+    .duration(300);
 
-  // UPDATE
+  // update a toplevelHeapObject
   heapColumns
     .order() // VERY IMPORTANT to put in the order corresponding to data elements
     .each(function(objID, i) {
@@ -1192,46 +1214,11 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       renderCompoundObject(objID, $(this), true);
     });
 
-  // EXIT
+  // delete a toplevelHeapObject
   heapColumns.exit()
     .remove();
 
 
-  // insert new heap rows
-  heapRows.enter().append('table')
-    //.each(function(objLst, i) {console.log('NEW ROW:', objLst, i);})
-    .attr('class', 'heapRow')
-    .append('tr')
-    .selectAll('td')
-    .data(function(d, i) {return d.slice(1, d.length);}, /* map over each row, skipping row ID tag */
-          function(objID) {return objID;} /* each object ID is unique for constancy */)
-    .enter().append('td')
-    .attr('class', 'toplevelHeapObject')
-    .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;})
-    .each(function(objID, i) {
-      //console.log('NEW ELT', objID);
-
-      // TODO: add a smoother transition in the future
-      renderCompoundObject(objID, $(this), true);
-    })
-    /*
-    .transition()
-    .style('border-color', 'red')
-    .duration(100)
-    .transition()
-    .style('border-color', 'white')
-    .delay(100)
-    .duration(600)
-    */
-
-
-
-  // remove deleted rows
-  heapRows.exit()
-    //.each(function(objLst, i) {console.log('DEL ROW:', objLst, i);})
-    .remove();
-
-
 
   function renderNestedObject(obj, d3DomElement) {
     if (isPrimitiveType(obj)) {

From b412ebeff0a57f39e7fe3f19fb0d326d454a8483 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 10 Aug 2012 17:39:05 -0700
Subject: [PATCH 105/502] started some experimental transition code

---
 PyTutorGAE/css/pytutor.css |  2 +-
 PyTutorGAE/js/pytutor.js   | 88 ++++++++++++++++++++++++--------------
 2 files changed, 56 insertions(+), 34 deletions(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index ded26ab65..992d8cacf 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -563,7 +563,7 @@ div#heap {
 
 td.toplevelHeapObject {
   /* to make room for transition animations */
-  padding: 8px;
+  padding: 5px;
   border: 2px dotted white;
   border-color: white; /* needed for d3 to do transitions */
 }
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index c6609376e..ef11a141a 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -90,6 +90,8 @@ function ExecutionVisualizer(domRootID, dat, params) {
   this.sortedBreakpointsList = null; // sorted and synced with breakpointLines
   this.hoverBreakpoints = null;      // set of breakpoints because we're HOVERING over a given line
 
+  this.enableTransitions = false; // EXPERIMENTAL - enable transition effects
+
 
   this.hasRendered = false;
 
@@ -347,16 +349,6 @@ ExecutionVisualizer.prototype.setKeyboardBindings = function() {
 
   leftTablePane.attr('tabindex', '0');
   leftTablePane.css('outline', 'none'); // don't display a tacky border when focused
-
-  // focus on mouse entering td#left_pane (so that the user doesn't need
-  // to click to focus)
-  // This is actually annoying because the display JERKS to focus on elements ...
-  /*
-  leftTablePane.mouseenter(function() {
-    leftTablePane.focus();
-  });
-  */
- 
  
   leftTablePane.keydown(function(k) {
     if (!myViz.keyStuckDown) {
@@ -1171,39 +1163,58 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   heapRows.enter().append('table')
     //.each(function(objLst, i) {console.log('NEW ROW:', objLst, i);})
     .attr('class', 'heapRow')
-    .append('tr')
+    .append('tr');
 
   // delete a heap row
-  heapRows.exit()
-    //.each(function(objLst, i) {console.log('DEL ROW:', objLst, i);})
-    .remove();
+  var hrExit = heapRows.exit();
+
+  if (myViz.enableTransitions) {
+    hrExit
+      .style('opacity', '1')
+      .transition()
+      .style('opacity', '0')
+      .duration(500)
+      .each('end', function() {
+        hrExit.remove();
+        myViz.redrawConnectors();
+      });
+  }
+  else {
+    hrExit.remove();
+  }
 
 
   // update an existing heap row
-  var heapColumns = heapRows
-    .each(function(objLst, i) { console.log('UPDATE ROW:', objLst, i); })
+  var toplevelHeapObjects = heapRows
+    //.each(function(objLst, i) { console.log('UPDATE ROW:', objLst, i); })
     .selectAll('td')
     .data(function(d, i) {return d.slice(1, d.length);}, /* map over each row, skipping row ID tag */
           function(objID) {return objID;} /* each object ID is unique for constancy */);
 
   // insert a new toplevelHeapObject
-  heapColumns.enter().append('td')
+  var tlhEnter = toplevelHeapObjects.enter().append('td')
     .attr('class', 'toplevelHeapObject')
-    .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;})
-    .style('opacity', '0')
-    .style('border-color', 'red')
-    // remember that the enter selection is added to the update
-    // selection so that we can process it later ...
-    .transition()
-    .style('opacity', '1') /* fade in */
-    .duration(500)
-    .transition()
-    .style('border-color', 'white')
-    .delay(500)
-    .duration(300);
+    .attr('id', function(d, i) {return 'toplevel_heap_object_' + d;});
+
+  if (myViz.enableTransitions) {
+    tlhEnter
+      .style('opacity', '0')
+      .style('border-color', 'red')
+      .transition()
+      .style('opacity', '1') /* fade in */
+      .duration(700)
+      .each('end', function() {
+        tlhEnter.transition()
+          .style('border-color', 'white') /* kill border */
+          .duration(300)
+        });
+  }
+
+  // remember that the enter selection is added to the update
+  // selection so that we can process it later ...
 
   // update a toplevelHeapObject
-  heapColumns
+  toplevelHeapObjects
     .order() // VERY IMPORTANT to put in the order corresponding to data elements
     .each(function(objID, i) {
       //console.log('NEW/UPDATE ELT', objID);
@@ -1215,9 +1226,20 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     });
 
   // delete a toplevelHeapObject
-  heapColumns.exit()
-    .remove();
-
+  var tlhExit = toplevelHeapObjects.exit();
+
+  if (myViz.enableTransitions) {
+    tlhExit.transition()
+      .style('opacity', '0') /* fade out */
+      .duration(500)
+      .each('end', function() {
+        tlhExit.remove();
+        myViz.redrawConnectors();
+      });
+  }
+  else {
+    tlhExit.remove();
+  }
 
 
   function renderNestedObject(obj, d3DomElement) {

From 61b4f03a6af549f6d80d999894546bcff163365d Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 10 Aug 2012 17:46:03 -0700
Subject: [PATCH 106/502] finished integrating john's changes for now

---
 PyTutorGAE/convert_2to3.py | 90 ++++++++++++++++++++++++++++++++++++++
 PyTutorGAE/css/pytutor.css |  5 ++-
 2 files changed, 94 insertions(+), 1 deletion(-)
 create mode 100644 PyTutorGAE/convert_2to3.py

diff --git a/PyTutorGAE/convert_2to3.py b/PyTutorGAE/convert_2to3.py
new file mode 100644
index 000000000..d5fb41d69
--- /dev/null
+++ b/PyTutorGAE/convert_2to3.py
@@ -0,0 +1,90 @@
+# Convert project from Python 2 to Python 3 and test that JSON traces are
+# unchanged for all examples.
+#
+# python3 convert_2to3.py
+#
+# Runs under Python 2.7 and Python 3.x without 2to3 conversion
+#
+# Created by John DeNero
+
+import generate_json_trace
+import os
+import sys
+import json
+
+
+def write_trace(python, example_path, output_path):
+  '''Use system call to generate a JSON trace using some python binary.'''
+  example = os.path.split(example_path)[1]
+  print('Generating JSON for "{0}" with {1}'.format(example, python))
+  cmd = '{0} generate_json_trace.py {1} > {2}'
+  os.system(cmd.format(python, example_path, output_path))
+
+
+def write_py2_traces(examples_dir, traces_dir):
+  '''Write JSON traces for all examples using Python 2.7.'''
+  for path, _, filenames in os.walk(examples_dir):
+    for example in filenames:
+      example_path = os.path.join(path, example)
+      outfile = path.replace(os.path.sep, '_') + '_' + example
+      output_path = os.path.join(traces_dir, outfile)
+      write_trace('python2.7', example_path, output_path)
+
+
+def verify_py3_traces(examples_dir, traces_dir):
+  '''Write and compare JSON traces for all examples using Python 3.'''
+  diffs = []
+  for path, _, filenames in os.walk(examples_dir):
+    for example in filenames:
+      example_path = os.path.join(path, example)
+      outfile = path.replace(os.path.sep, '_') + '_' + example
+      output_path = os.path.join(traces_dir, outfile + '.py3k')
+      write_trace('python3', example_path, output_path)
+
+      py2_path = os.path.join(traces_dir, outfile)
+      py2_result = json.load(open(py2_path))
+      py3_result = json.load(open(output_path))
+      if py2_result['trace'] != py3_result['trace']:
+        diffs.append(example)
+  return diffs
+
+
+known_differences = """Known differences include:
+
+fib.txt: "while True:" is evaluated once in Python 3, but repeatedly in Python.
+
+map.txt: 2to3 converts call to map() to a list comprehension.
+
+OOP*.txt, ll2.txt: __init__ functions orphan a __locals__ dict on the heap in
+                   Python 3, but it is not rendered in the front end.
+
+wentworth_try_finally.txt: Python 3 integer division is true, not floor.
+"""
+
+if __name__ == '__main__':
+  examples_dir = 'example-code'
+  if not os.path.exists(examples_dir):
+    print('Examples directory {0} does not exist.'.format(examples_dir))
+    sys.exit(1)
+
+  traces_dir = examples_dir + '-traces'
+  if os.path.exists(traces_dir):
+    print('Testing directory {0} already exists.'.format(traces_dir))
+    sys.exit(1)
+  os.mkdir(traces_dir)
+
+  write_py2_traces(examples_dir, traces_dir)
+
+  # Convert examples to Python 3
+  os.system('2to3 -w -n --no-diffs {0}/*.txt {0}/*/*.txt'.format(examples_dir))
+
+  diffs = verify_py3_traces(examples_dir, traces_dir)
+
+  if diffs:
+    print('Trace differences for: {0}'.format(diffs))
+    print('See {0} for traces.'.format(traces_dir))
+    print(known_differences)
+  else:
+    print('Traces are identical; cleaning up')
+    shutil.rm(traces_dir)
+
diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index 992d8cacf..85e83adb2 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -563,7 +563,10 @@ div#heap {
 
 td.toplevelHeapObject {
   /* to make room for transition animations */
-  padding: 5px;
+  padding-left: 8px;
+  padding-right: 8px;
+  padding-top: 4px;
+  padding-bottom: 4px;
   border: 2px dotted white;
   border-color: white; /* needed for d3 to do transitions */
 }

From 614fafe15fb1c435c803c55f857d776e0a0a6341 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 10 Aug 2012 18:35:42 -0700
Subject: [PATCH 107/502] removed useless thing

---
 PyTutorGAE/js/pytutor.js | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index ef11a141a..86622e82c 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1162,8 +1162,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   // insert new heap rows
   heapRows.enter().append('table')
     //.each(function(objLst, i) {console.log('NEW ROW:', objLst, i);})
-    .attr('class', 'heapRow')
-    .append('tr');
+    .attr('class', 'heapRow');
 
   // delete a heap row
   var hrExit = heapRows.exit();

From 839025b465a9524eaadd697cc5e0a0b4a205e548 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 10 Aug 2012 18:55:03 -0700
Subject: [PATCH 108/502] need most precise selections for selectAll, or else
 d3 will freak out

---
 PyTutorGAE/js/pytutor.js | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 86622e82c..b8e040f9e 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1186,7 +1186,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   // update an existing heap row
   var toplevelHeapObjects = heapRows
     //.each(function(objLst, i) { console.log('UPDATE ROW:', objLst, i); })
-    .selectAll('td')
+    .selectAll('td.toplevelHeapObject')
     .data(function(d, i) {return d.slice(1, d.length);}, /* map over each row, skipping row ID tag */
           function(objID) {return objID;} /* each object ID is unique for constancy */);
 
@@ -1505,7 +1505,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   // ENTER
   globalsD3.enter()
     .append('tr')
-    .selectAll('td')
+    .selectAll('td.stackFrameVar,td.stackFrameValue')
     .data(function(d, i){return d;}) /* map varname down both columns */
     .enter()
     .append('td')
@@ -1641,11 +1641,11 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   stackVarTable
     .enter()
-    .append('tr')
+    .append('tr');
   
 
   var stackVarTableCells = stackVarTable
-    .selectAll('td')
+    .selectAll('td.stackFrameVar,td.stackFrameValue')
     .data(function(d, i) {return [d, d] /* map identical data down both columns */;})
 
   stackVarTableCells.enter()

From 831e202608454dd45c4b31d4345cf154613be6ab Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 10 Aug 2012 21:53:37 -0700
Subject: [PATCH 109/502] fixed memory leak due to not detaching jsPlumb
 connectors

---
 PyTutorGAE/js/pytutor.js | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index b8e040f9e..6049e5a3f 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1094,6 +1094,8 @@ ExecutionVisualizer.prototype.precomputeCurTraceLayouts = function() {
 }
 
 
+var heapPtrSrcRE = /__heap_pointer_src_/;
+
 // The "3.0" version of renderDataStructures renders variables in
 // a stack, values in a separate heap, and draws line connectors
 // to represent both stack->heap object references and, more importantly,
@@ -1120,6 +1122,19 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   // Heap object rendering phase:
 
 
+  // This is VERY crude, but to prevent multiple redundant HEAP->HEAP
+  // connectors from being drawn with the same source and origin, we need to first
+  // DELETE ALL existing HEAP->HEAP connections, and then re-render all of
+  // them in each call to this function. The reason why we can't safely
+  // hold onto them is because there's no way to guarantee that the
+  // *__heap_pointer_src_ IDs are consistent across execution points.
+  myViz.jsPlumbInstance.select().each(function(c) {
+    if (c.sourceId.match(heapPtrSrcRE)) {
+      myViz.jsPlumbInstance.detachAllConnections(c.sourceId);
+    }
+  });
+
+
   // Key:   CSS ID of the div element representing the stack frame variable
   //        (for stack->heap connections) or heap object (for heap->heap connections)
   //        the format is: '__heap_pointer_src_'
@@ -1299,8 +1314,6 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
       var dstDivID = myViz.generateID('heap_object_' + objID);
 
-      // TODO: we might be able to further optimize, since we might be re-drawing
-      // HEAP->HEAP connections when we can just keep the existing ones
       assert(!connectionEndpointIDs.has(srcDivID));
       connectionEndpointIDs.set(srcDivID, dstDivID);
       //console.log('HEAP->HEAP', srcDivID, dstDivID);
@@ -1555,6 +1568,10 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
             var heapObjID = myViz.generateID('heap_object_' + getRefID(val));
             connectionEndpointIDs.set(varDivID, heapObjID);
             //console.log('STACK->HEAP', varDivID, heapObjID);
+
+            // GARBAGE COLLECTION GOTCHA! we need to get rid of the old
+            // connector in preparation for rendering a new one:
+            myViz.jsPlumbInstance.detachAllConnections(varDivID);
           }
 
           //console.log('CHANGED', varname, prevValStringRepr, valStringRepr);
@@ -1698,6 +1715,10 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
             var heapObjID = myViz.generateID('heap_object_' + getRefID(val));
             connectionEndpointIDs.set(varDivID, heapObjID);
             //console.log('STACK->HEAP', varDivID, heapObjID);
+
+            // GARBAGE COLLECTION GOTCHA! we need to get rid of the old
+            // connector in preparation for rendering a new one:
+            myViz.jsPlumbInstance.detachAllConnections(varDivID);
           }
 
           //console.log('CHANGED', frame.unique_hash, varname, prevValStringRepr, valStringRepr);
@@ -1729,9 +1750,10 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   /*
   myViz.jsPlumbInstance.select().each(function(c) {
-    console.log(c.sourceId, c.targetId);
+    console.log('CONN:', c.sourceId, c.targetId);
   });
   */
+  //console.log('---', myViz.jsPlumbInstance.select().length, '---');
 
 
   function highlight_frame(frameID) {

From 67e1b6467588c78d4e760205d691b6031d86550b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 14 Aug 2012 13:54:33 -0700
Subject: [PATCH 110/502] abstracted out CSS a bit better

---
 PyTutorGAE/css/opt-frontend.css | 64 +++++++++++++++++++++++++++++++++
 PyTutorGAE/css/pytutor.css      | 58 +-----------------------------
 PyTutorGAE/js/pytutor.js        |  2 +-
 PyTutorGAE/tutor.html           |  3 +-
 4 files changed, 68 insertions(+), 59 deletions(-)
 create mode 100644 PyTutorGAE/css/opt-frontend.css

diff --git a/PyTutorGAE/css/opt-frontend.css b/PyTutorGAE/css/opt-frontend.css
new file mode 100644
index 000000000..68bdd71e1
--- /dev/null
+++ b/PyTutorGAE/css/opt-frontend.css
@@ -0,0 +1,64 @@
+/* CSS accompanying ../tutor.html */
+
+h1 {
+  font-weight: normal;
+  font-size: 20pt;
+  font-family: georgia, serif;
+  line-height: 1em;  /* enforce single spacing so that Georgia works */
+
+  margin-top: 0px;
+  margin-bottom: 8px;
+}
+
+h2 {
+  font-size: 12pt;
+  font-weight: normal;
+  font-family: georgia, serif;
+  line-height: 1.1em; /* enforce single spacing so that Georgia works */
+
+  margin-top: 2px;
+  margin-bottom: 20px;
+}
+
+
+body {
+  background-color: white;
+  font-family: verdana, arial, helvetica, sans-serif;
+  font-size: 10pt;
+}
+
+a {
+  color: #3D58A2;
+}
+
+a:visited {
+  color: #3D58A2;
+}
+
+a:hover {
+  color: #3D58A2;
+}
+
+span {
+  padding: 0px;
+}
+
+table#pyOutputPane {
+  padding: 10px;
+}
+
+#pyInputPane {
+  margin-top: 20px;
+  margin-bottom: 20px;
+
+  max-width: 700px;
+  /* center align */
+  margin-left: auto;
+  margin-right: auto;
+}
+
+#codeInputPane {
+  margin-top: 5px;
+  font-size: 12pt;
+}
+
diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index 85e83adb2..f7a23aac1 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -65,63 +65,11 @@ Complementary Color:
 
 */
 
-h1 {
-  font-weight: normal;
-  font-size: 20pt;
-  font-family: georgia, serif;
-  line-height: 1em;  /* enforce single spacing so that Georgia works */
-
-  margin-top: 0px;
-  margin-bottom: 8px;
-}
-
-h2 {
-  font-size: 12pt;
-  font-weight: normal;
-  font-family: georgia, serif;
-  line-height: 1.1em; /* enforce single spacing so that Georgia works */
-
-  margin-top: 2px;
-  margin-bottom: 20px;
-}
-
-
-body {
-  background-color: white;
+table.visualizer {
   font-family: verdana, arial, helvetica, sans-serif;
   font-size: 10pt;
 }
 
-a {
-  color: #3D58A2;
-}
-
-a:visited {
-  color: #3D58A2;
-}
-
-a:hover {
-  color: #3D58A2;
-}
-
-span {
-  padding: 0px;
-}
-
-#pyInputPane {
-  margin-top: 20px;
-  margin-bottom: 20px;
-
-  max-width: 700px;
-  /* center align */
-  margin-left: auto;
-  margin-right: auto;
-}
-
-#codeInputPane {
-  margin-top: 5px;
-  font-size: 12pt;
-}
 
 td#stack_td,
 td#heap_td {
@@ -129,10 +77,6 @@ td#heap_td {
   font-size: 10pt; /* don't make fonts in the heap so big! */
 }
 
-table#pyOutputPane {
-  padding: 15px;
-}
-
 #dataViz {
   margin-left: 30px;
 }
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 6049e5a3f..4424b6315 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -118,7 +118,7 @@ ExecutionVisualizer.prototype.render = function() {
 
   // TODO: make less gross!
   this.domRoot.html(
-  '\
+  '
\
     \
       ","
\
         
\
diff --git a/PyTutorGAE/tutor.html b/PyTutorGAE/tutor.html
index 8750fcbbc..0b417e87e 100644
--- a/PyTutorGAE/tutor.html
+++ b/PyTutorGAE/tutor.html
@@ -59,6 +59,7 @@
 
 
 
+
 
 
 
@@ -142,7 +143,7 @@
 
 
 
-

+

 

 
 
"]||(!O.indexOf("
"]||!O.indexOf("",""]||!o.support.htmlSerialize&&[1,"div
","
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diff --git a/PyTutorGAE/js/jquery-1.6.min.js b/PyTutorGAE/js/jquery-1.6.min.js
new file mode 100644
index 000000000..c72011dfa
--- /dev/null
+++ b/PyTutorGAE/js/jquery-1.6.min.js
@@ -0,0 +1,16 @@
+/*!
+ * jQuery JavaScript Library v1.6
+ * http://jquery.com/
+ *
+ * Copyright 2011, John Resig
+ * Dual licensed under the MIT or GPL Version 2 licenses.
+ * http://jquery.org/license
+ *
+ * Includes Sizzle.js
+ * http://sizzlejs.com/
+ * Copyright 2011, The Dojo Foundation
+ * Released under the MIT, BSD, and GPL Licenses.
+ *
+ * Date: Mon May 2 13:50:00 2011 -0400
+ */
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";f.extend(b.style,{position:"absolute",top:0,left:0,margin:0,border:0,width:"1px",height:"1px",visibility:"hidden"}),b.innerHTML=j,a.insertBefore(b,a.firstChild),d=b.firstChild,e=d.firstChild,h=d.nextSibling.firstChild.firstChild,this.doesNotAddBorder=e.offsetTop!==5,this.doesAddBorderForTableAndCells=h.offsetTop===5,e.style.position="fixed",e.style.top="20px",this.supportsFixedPosition=e.offsetTop===20||e.offsetTop===15,e.style.position=e.style.top="",d.style.overflow="hidden",d.style.position="relative",this.subtractsBorderForOverflowNotVisible=e.offsetTop===-5,this.doesNotIncludeMarginInBodyOffset=a.offsetTop!==i,a.removeChild(b),f.offset.initialize=f.noop},bodyOffset:function(a){var b=a.offsetTop,c=a.offsetLeft;f.offset.initialize(),f.offset.doesNotIncludeMarginInBodyOffset&&(b+=parseFloat(f.css(a,"marginTop"))||0,c+=parseFloat(f.css(a,"marginLeft"))||0);return{top:b,left:c}},setOffset:function(a,b,c){var d=f.css(a,"position");d==="static"&&(a.style.position="relative");var e=f(a),g=e.offset(),h=f.css(a,"top"),i=f.css(a,"left"),j=(d==="absolute"||d==="fixed")&&f.inArray("auto",[h,i])>-1,k={},l={},m,n;j?(l=e.position(),m=l.top,n=l.left):(m=parseFloat(h)||0,n=parseFloat(i)||0),f.isFunction(b)&&(b=b.call(a,c,g)),b.top!=null&&(k.top=b.top-g.top+m),b.left!=null&&(k.left=b.left-g.left+n),"using"in b?b.using.call(a,k):e.css(k)}},f.fn.extend({position:function(){if(!this[0])return null;var a=this[0],b=this.offsetParent(),c=this.offset(),d=cv.test(b[0].nodeName)?{top:0,left:0}:b.offset();c.top-=parseFloat(f.css(a,"marginTop"))||0,c.left-=parseFloat(f.css(a,"marginLeft"))||0,d.top+=parseFloat(f.css(b[0],"borderTopWidth"))||0,d.left+=parseFloat(f.css(b[0],"borderLeftWidth"))||0;return{top:c.top-d.top,left:c.left-d.left}},offsetParent:function(){return this.map(function(){var a=this.offsetParent||c.body;while(a&&!cv.test(a.nodeName)&&f.css(a,"position")==="static")a=a.offsetParent;return a})}}),f.each(["Left","Top"],function(a,c){var d="scroll"+c;f.fn[d]=function(c){var e,g;if(c===b){e=this[0];if(!e)return null;g=cw(e);return g?"pageXOffset"in g?g[a?"pageYOffset":"pageXOffset"]:f.support.boxModel&&g.document.documentElement[d]||g.document.body[d]:e[d]}return this.each(function(){g=cw(this),g?g.scrollTo(a?f(g).scrollLeft():c,a?c:f(g).scrollTop()):this[d]=c})}}),f.each(["Height","Width"],function(a,c){var d=c.toLowerCase();f.fn["inner"+c]=function(){return this[0]?parseFloat(f.css(this[0],d,"padding")):null},f.fn["outer"+c]=function(a){return this[0]?parseFloat(f.css(this[0],d,a?"margin":"border")):null},f.fn[d]=function(a){var e=this[0];if(!e)return a==null?null:this;if(f.isFunction(a))return this.each(function(b){var c=f(this);c[d](a.call(this,b,c[d]()))});if(f.isWindow(e)){var g=e.document.documentElement["client"+c];return e.document.compatMode==="CSS1Compat"&&g||e.document.body["client"+c]||g}if(e.nodeType===9)return Math.max(e.documentElement["client"+c],e.body["scroll"+c],e.documentElement["scroll"+c],e.body["offset"+c],e.documentElement["offset"+c]);if(a===b){var h=f.css(e,d),i=parseFloat(h);return f.isNaN(i)?h:i}return this.css(d,typeof a=="string"?a:a+"px")}}),a.jQuery=a.$=f})(window);
\ No newline at end of file
diff --git a/PyTutorGAE/js/opt-frontend.js b/PyTutorGAE/js/opt-frontend.js
index 1d0b56c55..c5ca2f22c 100644
--- a/PyTutorGAE/js/opt-frontend.js
+++ b/PyTutorGAE/js/opt-frontend.js
@@ -35,6 +35,7 @@ var appMode = 'edit'; // 'edit' or 'visualize'
 
 var preseededCode = null;     // if you passed in a 'code=' in the URL, then set this var
 var preseededCurInstr = null; // if you passed in a 'curInstr=' in the URL, then set this var
+var preseededMode = null;     // if you passed in a 'mode=' in the URL, then set this var
 
 
 var myVisualizer = null; // singleton ExecutionVisualizer instance
@@ -47,7 +48,7 @@ function enterEditMode() {
 var pyInputCodeMirror; // CodeMirror object that contains the input text
 
 function setCodeMirrorVal(dat) {
-  pyInputCodeMirror.setValue(dat);
+  pyInputCodeMirror.setValue(dat.rtrim() /* kill trailing spaces */);
 }
 
 
@@ -68,8 +69,9 @@ $(document).ready(function() {
   $(window).bind("hashchange", function(e) {
     appMode = $.bbq.getState('mode'); // assign this to the GLOBAL appMode
 
-    // globals defined in pytutor.js
+    // yuck, globals!
     preseededCode = $.bbq.getState('code');
+    preseededMode = $.bbq.getState('mode');
 
     if (!preseededCurInstr) { // TODO: kinda gross hack
       preseededCurInstr = Number($.bbq.getState('curInstr'));
@@ -85,9 +87,8 @@ $(document).ready(function() {
     if (!myVisualizer) {
       appMode = 'edit';
 
-      if (preseededCode) {
-        // if you've pre-seeded 'code' and 'curInstr' params in the URL hash,
-        // then punt for now ...
+      if (preseededCode && preseededMode == 'visualize') {
+        // punt for now ...
       }
       else {
         $.bbq.pushState({ mode: 'edit' }, 2 /* completely override other hash strings to keep URL clean */);
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index d94556b8b..789da6dc2 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -27,6 +27,23 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
 
+/* To import, put this at the top of your HTML page:
+
+
+
+
+ 
+ 
+ 
+
+
+
+
+
+*/
+
+
+
 var curVisualizerID = 1; // global to uniquely identify each ExecutionVisualizer instance
 
 // domRootID is the string ID of the root element where to render this instance
@@ -38,8 +55,9 @@ var curVisualizerID = 1; // global to uniquely identify each ExecutionVisualizer
 //   startingInstruction - the (zero-indexed) execution point to display upon rendering
 //   hideOutput - hide "Program output" and "Generate URL" displays
 //   codeDivHeight - maximum height of #pyCodeOutputDiv (in pixels)
+//   editCodeBaseURL - the base URL to visit when the user clicks 'Edit code'
 function ExecutionVisualizer(domRootID, dat, params) {
-  this.curInputCode = dat.code;
+  this.curInputCode = dat.code.rtrim(); // kill trailing spaces
   this.curTrace = dat.trace;
 
   this.curInstr = 0;
@@ -125,7 +143,7 @@ ExecutionVisualizer.prototype.render = function() {
         
\
           
\
           
\
-            \
+            Edit code\
           
\
           
\
             Click here to focus and then use the left and right arrow keys to
\
@@ -172,6 +190,18 @@ ExecutionVisualizer.prototype.render = function() {
   ');
 
 
+  if (this.params.editCodeBaseURL) {
+    var urlStr = $.param.fragment(this.params.editCodeBaseURL,
+                                  {code: this.curInputCode},
+                                  2);
+    this.domRoot.find('#editBtn').attr('href', urlStr);
+  }
+  else {
+    this.domRoot.find('#editBtn').attr('href', "#");
+    this.domRoot.find('#editBtn').click(function(){return false;}); // DISABLE the link!
+  }
+
+
   // create a persistent globals frame
   // (note that we need to keep #globals_area separate from #stack for d3 to work its magic)
   this.domRoot.find("#globals_area").append('

+
+
+
+ 
+ 
+ 
+
 
+
+
 
-
+
+
 
 
 
 
 
 
-
-
-
-
-
-
-
-
-
-
-
-
 
-
-
 
 
-
 
 
 

From 95e4d35983305a3df655004966391e1959832aaf Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 14 Aug 2012 19:28:46 -0700
Subject: [PATCH 116/502] some minor renaming to prepare for adding more zombie
 frames

---
 PyTutorGAE/js/pytutor.js |  2 +-
 PyTutorGAE/pg_logger.py  | 28 ++++++++++++++--------------
 2 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 789da6dc2..8c37eb308 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1712,7 +1712,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       var frame = d.frame;
 
       if (i == 0) {
-        if (varname == '__return__' && !frame.is_zombie)
+        if (varname == '__return__')
           $(this).html('Return
value');
         else
           $(this).html(varname);
diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index 113ad852b..438345a46 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -98,10 +98,10 @@ def __init__(self, finalizer_func):
         # Value: parent frame
         self.closures = {}
 
-        # List of frames to KEEP AROUND after the function exits,
-        # because nested functions were defined in those frames.
-        # ORDER matters for aesthetics.
-        self.zombie_frames = []
+        # List of frames to KEEP AROUND after the function exits
+        # because nested functions were defined within those frames.
+        # (ORDER matters for aesthetics)
+        self.zombie_parent_frames = []
 
         # all globals that ever appeared in the program, in the order in
         # which they appeared. note that this might be a superset of all
@@ -148,19 +148,19 @@ def get_parent_frame(self, frame):
       return None
 
 
-    def get_zombie_frame_id(self, f):
+    def get_zombie_parent_frame_id(self, f):
       # should be None unless this is a zombie frame
       try:
         # make the frame id's one-indexed for clarity
         # (and to prevent possible confusion with None)
-        return self.zombie_frames.index(f) + 1
+        return self.zombie_parent_frames.index(f) + 1
       except ValueError:
         pass
       return None
 
     def lookup_zombie_frame_by_id(self, idx):
       # remember this is one-indexed
-      return self.zombie_frames[idx - 1]
+      return self.zombie_parent_frames[idx - 1]
 
 
     # unused ...
@@ -230,7 +230,7 @@ def interaction(self, frame, traceback, event_type):
 
         # only render zombie frames that are NO LONGER on the stack
         cur_stack_frames = [e[0] for e in self.stack]
-        zombie_frames_to_render = [e for e in self.zombie_frames if e not in cur_stack_frames]
+        zombie_frames_to_render = [e for e in self.zombie_parent_frames if e not in cur_stack_frames]
 
 
         # each element is a pair of (function name, ENCODED locals dict)
@@ -250,7 +250,7 @@ def create_encoded_stack_entry(cur_frame):
           while True:
             p = self.get_parent_frame(f)
             if p:
-              pid = self.get_zombie_frame_id(p)
+              pid = self.get_zombie_parent_frame_id(p)
               assert pid
               parent_frame_id_list.append(pid)
               f = p
@@ -299,7 +299,7 @@ def create_encoded_stack_entry(cur_frame):
             if type(v) in (types.FunctionType, types.MethodType):
               try:
                 enclosing_frame = self.closures[v]
-                enclosing_frame_id = self.get_zombie_frame_id(enclosing_frame)
+                enclosing_frame_id = self.get_zombie_parent_frame_id(enclosing_frame)
                 self.encoder.set_function_parent_frame_ID(encoded_val, enclosing_frame_id)
               except KeyError:
                 pass
@@ -340,7 +340,7 @@ def create_encoded_stack_entry(cur_frame):
             assert e in encoded_locals
 
           return dict(func_name=cur_name,
-                      frame_id=self.get_zombie_frame_id(cur_frame),
+                      frame_id=self.get_zombie_parent_frame_id(cur_frame),
                       parent_frame_id_list=parent_frame_id_list,
                       encoded_locals=encoded_locals,
                       ordered_varnames=ordered_varnames)
@@ -355,8 +355,8 @@ def create_encoded_stack_entry(cur_frame):
             if (type(v) in (types.FunctionType, types.MethodType) and \
                 v not in self.closures):
               self.closures[v] = top_frame
-              if not top_frame in self.zombie_frames:
-                self.zombie_frames.append(top_frame)
+              if not top_frame in self.zombie_parent_frames:
+                self.zombie_parent_frames.append(top_frame)
 
 
         # climb up until you find '', which is (hopefully) the global scope
@@ -382,7 +382,7 @@ def create_encoded_stack_entry(cur_frame):
           if type(v) in (types.FunctionType, types.MethodType):
             try:
               enclosing_frame = self.closures[v]
-              enclosing_frame_id = self.get_zombie_frame_id(enclosing_frame)
+              enclosing_frame_id = self.get_zombie_parent_frame_id(enclosing_frame)
               self.encoder.set_function_parent_frame_ID(encoded_val, enclosing_frame_id)
             except KeyError:
               pass

From 6541e1e48f23f398a598f8514776f9ee3e4c172b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 15 Aug 2012 08:56:21 -0700
Subject: [PATCH 117/502] slight style adjustment for frames

---
 PyTutorGAE/css/pytutor.css | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index f7a23aac1..f5a232ade 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -449,13 +449,13 @@ div.stackFrame, div.zombieStackFrame {
   padding-left: 6px;
   padding-right: 6px;
   padding-bottom: 4px;
-  font-size: 11pt;
+  font-size: 10pt;
   border-left: 2px solid #666666;
 }
 
 div.zombieStackFrame {
-  border-left: 1px dotted #aaaaaa; /* make zombie borders thinner */
-  color: #aaaaaa;
+  border-left: 1px dotted #999999; /* make zombie borders thinner */
+  color: #999999;
 }
 
 div.highlightedStackFrame {

From bc4e8ae18f662188459f398d2376101fc34c4141 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 15 Aug 2012 09:02:34 -0700
Subject: [PATCH 118/502] first pass at cumulative display mode

---
 PyTutorGAE/pg_logger.py | 108 +++++++++++++++++++++++-----------------
 1 file changed, 61 insertions(+), 47 deletions(-)

diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index 438345a46..3d53364ef 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -78,7 +78,7 @@ def filter_var_dict(d):
 
 class PGLogger(bdb.Bdb):
 
-    def __init__(self, finalizer_func):
+    def __init__(self, finalizer_func, cumulative_display=False):
         bdb.Bdb.__init__(self)
         self.mainpyfile = ''
         self._wait_for_mainpyfile = 0
@@ -87,6 +87,12 @@ def __init__(self, finalizer_func):
         # processes it
         self.finalizer_func = finalizer_func
 
+        # if True, then displays ALL stack frames that have ever existed
+        # rather than only those currently on the stack (and their
+        # lexical parents)
+        self.cumulative_display = cumulative_display
+        self.cumulative_display = True
+
         # each entry contains a dict with the information for a single
         # executed line
         self.trace = []
@@ -98,10 +104,16 @@ def __init__(self, finalizer_func):
         # Value: parent frame
         self.closures = {}
 
-        # List of frames to KEEP AROUND after the function exits
-        # because nested functions were defined within those frames.
-        # (ORDER matters for aesthetics)
-        self.zombie_parent_frames = []
+        # Key: id() of frame object
+        # Value: monotonically increasing small ID, based on call order
+        self.frame_ordered_ids = {}
+        self.cur_frame_id = 1
+
+        # List of frames to KEEP AROUND after the function exits.
+        # If cumulative_display is True, then keep ALL frames in
+        # zombie_frames; otherwise keep only frames where
+        # nested functions were defined within them.
+        self.zombie_frames = []
 
         # all globals that ever appeared in the program, in the order in
         # which they appeared. note that this might be a superset of all
@@ -116,6 +128,10 @@ def __init__(self, finalizer_func):
         self.executed_script = None # Python script to be executed!
 
 
+    def get_frame_id(self, cur_frame):
+      return self.frame_ordered_ids[id(cur_frame)]
+
+
     # Returns the (lexical) parent frame of the function that was called
     # to create the stack frame 'frame'.
     #
@@ -148,19 +164,12 @@ def get_parent_frame(self, frame):
       return None
 
 
-    def get_zombie_parent_frame_id(self, f):
-      # should be None unless this is a zombie frame
-      try:
-        # make the frame id's one-indexed for clarity
-        # (and to prevent possible confusion with None)
-        return self.zombie_parent_frames.index(f) + 1
-      except ValueError:
-        pass
-      return None
-
-    def lookup_zombie_frame_by_id(self, idx):
-      # remember this is one-indexed
-      return self.zombie_parent_frames[idx - 1]
+    def lookup_zombie_frame_by_id(self, frame_id):
+      # TODO: kinda inefficient
+      for e in self.zombie_frames:
+        if self.get_frame_id(e) == frame_id:
+          return e
+      assert False # should never get here
 
 
     # unused ...
@@ -227,10 +236,19 @@ def interaction(self, frame, traceback, event_type):
         self.encoder.reset_heap() # VERY VERY VERY IMPORTANT,
                                   # or else we won't properly capture heap object mutations in the trace!
 
+        if event_type == 'call':
+          tfid = id(top_frame)
+          assert tfid not in self.frame_ordered_ids
+          self.frame_ordered_ids[tfid] = self.cur_frame_id
+          self.cur_frame_id += 1
+
+          if self.cumulative_display:
+            self.zombie_frames.append(top_frame)
+
 
         # only render zombie frames that are NO LONGER on the stack
         cur_stack_frames = [e[0] for e in self.stack]
-        zombie_frames_to_render = [e for e in self.zombie_parent_frames if e not in cur_stack_frames]
+        zombie_frames_to_render = [e for e in self.zombie_frames if e not in cur_stack_frames]
 
 
         # each element is a pair of (function name, ENCODED locals dict)
@@ -242,15 +260,13 @@ def create_encoded_stack_entry(cur_frame):
           ret = {}
 
 
-          # your immediate parent frame ID is parent_frame_id_list[0]
-          # and all other members are your further ancestors
           parent_frame_id_list = []
 
           f = cur_frame
           while True:
             p = self.get_parent_frame(f)
             if p:
-              pid = self.get_zombie_parent_frame_id(p)
+              pid = self.get_frame_id(p)
               assert pid
               parent_frame_id_list.append(pid)
               f = p
@@ -299,7 +315,7 @@ def create_encoded_stack_entry(cur_frame):
             if type(v) in (types.FunctionType, types.MethodType):
               try:
                 enclosing_frame = self.closures[v]
-                enclosing_frame_id = self.get_zombie_parent_frame_id(enclosing_frame)
+                enclosing_frame_id = self.get_frame_id(enclosing_frame)
                 self.encoder.set_function_parent_frame_ID(encoded_val, enclosing_frame_id)
               except KeyError:
                 pass
@@ -340,7 +356,8 @@ def create_encoded_stack_entry(cur_frame):
             assert e in encoded_locals
 
           return dict(func_name=cur_name,
-                      frame_id=self.get_zombie_parent_frame_id(cur_frame),
+                      frame_id=self.get_frame_id(cur_frame),
+                      # TODO: fixme
                       parent_frame_id_list=parent_frame_id_list,
                       encoded_locals=encoded_locals,
                       ordered_varnames=ordered_varnames)
@@ -355,8 +372,8 @@ def create_encoded_stack_entry(cur_frame):
             if (type(v) in (types.FunctionType, types.MethodType) and \
                 v not in self.closures):
               self.closures[v] = top_frame
-              if not top_frame in self.zombie_parent_frames:
-                self.zombie_parent_frames.append(top_frame)
+              if not top_frame in self.zombie_frames:
+                self.zombie_frames.append(top_frame)
 
 
         # climb up until you find '', which is (hopefully) the global scope
@@ -382,7 +399,7 @@ def create_encoded_stack_entry(cur_frame):
           if type(v) in (types.FunctionType, types.MethodType):
             try:
               enclosing_frame = self.closures[v]
-              enclosing_frame_id = self.get_zombie_parent_frame_id(enclosing_frame)
+              enclosing_frame_id = self.get_frame_id(enclosing_frame)
               self.encoder.set_function_parent_frame_ID(encoded_val, enclosing_frame_id)
             except KeyError:
               pass
@@ -402,40 +419,38 @@ def create_encoded_stack_entry(cur_frame):
         # making it look aesthetically pretty
         stack_to_render = [];
 
-        # first push all regular stack entries BACKWARDS
+        # first push all regular stack entries
         if encoded_stack_locals:
-          stack_to_render = encoded_stack_locals[::-1]
-          for e in stack_to_render:
+          for e in encoded_stack_locals:
             e['is_zombie'] = False
             e['is_highlighted'] = False
+            stack_to_render.append(e)
 
-          stack_to_render[-1]['is_highlighted'] = True
+          # highlight the top-most active stack entry
+          stack_to_render[0]['is_highlighted'] = True
 
 
-        # zombie_encoded_stack_locals consists of exited functions that have returned
-        # nested functions. Push zombie stack entries at the BEGINNING of stack_to_render,
-        # EXCEPT put zombie entries BEHIND regular entries that are their parents
-        for e in zombie_encoded_stack_locals[::-1]:
+        # now push all zombie stack entries
+        for e in zombie_encoded_stack_locals:
           # don't display return value for zombie frames
+          # TODO: reconsider ...
+          '''
           try:
             e['ordered_varnames'].remove('__return__')
           except ValueError:
             pass
+          '''
 
           e['is_zombie'] = True
           e['is_highlighted'] = False # never highlight zombie entries
 
-          # j should be 0 most of the time, so we're always inserting new
-          # elements to the front of stack_to_render (which is why we are
-          # iterating backwards over zombie_stack_locals).
-          j = 0
-          while j < len(stack_to_render):
-            if stack_to_render[j]['frame_id'] in e['parent_frame_id_list']:
-              j += 1
-              continue
-            break
+          stack_to_render.append(e)
+
+        # now sort by frame_id since that sorts frames in "chronological
+        # order" based on the order they were invoked
+        stack_to_render.sort(key=lambda e: e['frame_id'])
+
 
-          stack_to_render.insert(j, e)
 
         # create a unique hash for this stack entry, so that the
         # frontend can uniquely identify it when doing incremental
@@ -445,8 +460,7 @@ def create_encoded_stack_entry(cur_frame):
         # disambiguating recursion!)
         for (stack_index, e) in enumerate(stack_to_render):
           hash_str = e['func_name']
-          if e['frame_id']:
-            hash_str += '_f' + str(e['frame_id'])
+          hash_str += '_f' + str(e['frame_id'])
           if e['parent_frame_id_list']:
             hash_str += '_p' + '_'.join([str(i) for i in e['parent_frame_id_list']])
           if e['is_zombie']:

From eec35c38174cf390ea7bee96f1003219b41ab7d2 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 15 Aug 2012 09:33:44 -0700
Subject: [PATCH 119/502] sync'ed display with frontend

---
 PyTutorGAE/js/pytutor.js |  6 +++---
 PyTutorGAE/pg_logger.py  | 32 +++++++++++++++++---------------
 2 files changed, 20 insertions(+), 18 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 8c37eb308..beebb8739 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1660,9 +1660,9 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
       var headerLabel = funcName + '()';
 
-      var frameID = frame.frame_id; // optional (btw, this isn't a CSS id)
-      if (frameID) {
-        headerLabel = 'f' + frameID + ': ' + headerLabel;
+      // only display if you're someone's parent
+      if (frame.is_parent) {
+        headerLabel = 'f' + frame.frame_id + ': ' + headerLabel;
       }
 
       // optional (btw, this isn't a CSS id)
diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index 3d53364ef..10c099b4a 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -91,7 +91,6 @@ def __init__(self, finalizer_func, cumulative_display=False):
         # rather than only those currently on the stack (and their
         # lexical parents)
         self.cumulative_display = cumulative_display
-        self.cumulative_display = True
 
         # each entry contains a dict with the information for a single
         # executed line
@@ -104,7 +103,7 @@ def __init__(self, finalizer_func, cumulative_display=False):
         # Value: parent frame
         self.closures = {}
 
-        # Key: id() of frame object
+        # Key: frame object
         # Value: monotonically increasing small ID, based on call order
         self.frame_ordered_ids = {}
         self.cur_frame_id = 1
@@ -115,6 +114,10 @@ def __init__(self, finalizer_func, cumulative_display=False):
         # nested functions were defined within them.
         self.zombie_frames = []
 
+        # set of elements within zombie_frames that are also
+        # LEXICAL PARENTS of other frames
+        self.parent_frames_set = set()
+
         # all globals that ever appeared in the program, in the order in
         # which they appeared. note that this might be a superset of all
         # the globals that exist at any particular execution point,
@@ -129,7 +132,7 @@ def __init__(self, finalizer_func, cumulative_display=False):
 
 
     def get_frame_id(self, cur_frame):
-      return self.frame_ordered_ids[id(cur_frame)]
+      return self.frame_ordered_ids[cur_frame]
 
 
     # Returns the (lexical) parent frame of the function that was called
@@ -237,9 +240,8 @@ def interaction(self, frame, traceback, event_type):
                                   # or else we won't properly capture heap object mutations in the trace!
 
         if event_type == 'call':
-          tfid = id(top_frame)
-          assert tfid not in self.frame_ordered_ids
-          self.frame_ordered_ids[tfid] = self.cur_frame_id
+          assert top_frame not in self.frame_ordered_ids
+          self.frame_ordered_ids[top_frame] = self.cur_frame_id
           self.cur_frame_id += 1
 
           if self.cumulative_display:
@@ -356,8 +358,8 @@ def create_encoded_stack_entry(cur_frame):
             assert e in encoded_locals
 
           return dict(func_name=cur_name,
+                      is_parent=(cur_frame in self.parent_frames_set),
                       frame_id=self.get_frame_id(cur_frame),
-                      # TODO: fixme
                       parent_frame_id_list=parent_frame_id_list,
                       encoded_locals=encoded_locals,
                       ordered_varnames=ordered_varnames)
@@ -372,6 +374,7 @@ def create_encoded_stack_entry(cur_frame):
             if (type(v) in (types.FunctionType, types.MethodType) and \
                 v not in self.closures):
               self.closures[v] = top_frame
+              self.parent_frames_set.add(top_frame) # unequivocally add to this set!!!
               if not top_frame in self.zombie_frames:
                 self.zombie_frames.append(top_frame)
 
@@ -456,16 +459,17 @@ def create_encoded_stack_entry(cur_frame):
         # frontend can uniquely identify it when doing incremental
         # rendering. the strategy is to use a frankenstein-like mix of the
         # relevant fields to properly disambiguate closures and recursive
-        # calls to the same function (stack_index is key for
-        # disambiguating recursion!)
-        for (stack_index, e) in enumerate(stack_to_render):
+        # calls to the same function
+        for e in stack_to_render:
           hash_str = e['func_name']
+          # frame_id is UNIQUE, so it can disambiguate recursive calls
           hash_str += '_f' + str(e['frame_id'])
-          if e['parent_frame_id_list']:
-            hash_str += '_p' + '_'.join([str(i) for i in e['parent_frame_id_list']])
+
+          # TODO: this is no longer needed, right? (since frame_id is unique)
+          #if e['parent_frame_id_list']:
+          #  hash_str += '_p' + '_'.join([str(i) for i in e['parent_frame_id_list']])
           if e['is_zombie']:
             hash_str += '_z'
-          hash_str += '_i' + str(stack_index)
 
           e['unique_hash'] = hash_str
 
@@ -475,8 +479,6 @@ def create_encoded_stack_entry(cur_frame):
                            func_name=tos[0].f_code.co_name,
                            globals=encoded_globals,
                            ordered_globals=ordered_globals,
-                           #stack_locals=encoded_stack_locals,               # DEPRECATED in favor of stack_to_render
-                           #zombie_stack_locals=zombie_encoded_stack_locals, # DEPRECATED in favor of stack_to_render
                            stack_to_render=stack_to_render,
                            heap=self.encoder.get_heap(),
                            stdout=get_user_stdout(tos[0]))

From 0efd6998ba41bff9cf02093110a09a555753143a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 15 Aug 2012 09:41:12 -0700
Subject: [PATCH 120/502] slightly more robust error handling

---
 PyTutorGAE/js/opt-frontend.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/PyTutorGAE/js/opt-frontend.js b/PyTutorGAE/js/opt-frontend.js
index c5ca2f22c..e7d50c644 100644
--- a/PyTutorGAE/js/opt-frontend.js
+++ b/PyTutorGAE/js/opt-frontend.js
@@ -148,9 +148,9 @@ $(document).ready(function() {
             // don't enter visualize mode if there are killer errors:
             if (!trace ||
                 (trace.length == 0) ||
-                ((trace.length == 1) && trace[0].event == 'uncaught_exception')) {
+                (trace[trace.length - 1].event == 'uncaught_exception')) {
 
-              if (trace.length > 0) {
+              if (trace.length == 1) {
                 var errorLineNo = trace[0].line - 1; /* CodeMirror lines are zero-indexed */
                 if (errorLineNo !== undefined) {
                   // highlight the faulting line in pyInputCodeMirror
@@ -167,7 +167,7 @@ $(document).ready(function() {
                 alert(trace[0].exception_msg);
               }
               else {
-                alert("Whoa, unknown error! Please reload and try again.");
+                alert("Whoa, unknown error! Reload to try again, or report a bug to philip@pgbovine.net");
               }
 
               $('#executeBtn').html("Visualize execution");

From f98d4fd1765647ee1eac3bf4597b769b61d34bf6 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 15 Aug 2012 21:15:12 -0700
Subject: [PATCH 121/502] added hooks to activate cumulative_mode from the web
 and command-line

---
 PyTutorGAE/css/pytutor.css        |  4 ++--
 PyTutorGAE/generate_json_trace.py |  5 ++++-
 PyTutorGAE/js/opt-frontend.js     |  3 ++-
 PyTutorGAE/pg_logger.py           | 16 ++++++++++------
 PyTutorGAE/pythontutor.py         |  8 +++++++-
 PyTutorGAE/tutor.html             |  5 +++--
 PyTutorGAE/web_exec.py            |  4 +++-
 7 files changed, 31 insertions(+), 14 deletions(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index f5a232ade..617e4d581 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -454,8 +454,8 @@ div.stackFrame, div.zombieStackFrame {
 }
 
 div.zombieStackFrame {
-  border-left: 1px dotted #999999; /* make zombie borders thinner */
-  color: #999999;
+  border-left: 1px dotted #aaa; /* make zombie borders thinner */
+  color: #aaa;
 }
 
 div.highlightedStackFrame {
diff --git a/PyTutorGAE/generate_json_trace.py b/PyTutorGAE/generate_json_trace.py
index 380463a56..e0799d437 100644
--- a/PyTutorGAE/generate_json_trace.py
+++ b/PyTutorGAE/generate_json_trace.py
@@ -1,5 +1,8 @@
 # Generates a JSON trace that is compatible with the js/pytutor.js frontend
 
+CUMULATIVE_MODE = False
+
+
 import sys, pg_logger, json
 
 
@@ -10,5 +13,5 @@ def json_finalizer(input_code, output_trace):
 
 
 for f in sys.argv[1:]:
-  pg_logger.exec_script_str(open(f).read(), json_finalizer)
+  pg_logger.exec_script_str(open(f).read(), CUMULATIVE_MODE, json_finalizer)
 
diff --git a/PyTutorGAE/js/opt-frontend.js b/PyTutorGAE/js/opt-frontend.js
index e7d50c644..d53d5b2b8 100644
--- a/PyTutorGAE/js/opt-frontend.js
+++ b/PyTutorGAE/js/opt-frontend.js
@@ -141,7 +141,8 @@ $(document).ready(function() {
 
 
     $.get(backend_script,
-          {user_script : pyInputCodeMirror.getValue()},
+          {user_script : pyInputCodeMirror.getValue(),
+           cumulative_mode: $('#cumulativeMode').prop('checked')},
           function(dataFromBackend) {
             var trace = dataFromBackend.trace;
             
diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index 10c099b4a..a5354895b 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -78,7 +78,7 @@ def filter_var_dict(d):
 
 class PGLogger(bdb.Bdb):
 
-    def __init__(self, finalizer_func, cumulative_display=False):
+    def __init__(self, cumulative_mode, finalizer_func):
         bdb.Bdb.__init__(self)
         self.mainpyfile = ''
         self._wait_for_mainpyfile = 0
@@ -90,7 +90,7 @@ def __init__(self, finalizer_func, cumulative_display=False):
         # if True, then displays ALL stack frames that have ever existed
         # rather than only those currently on the stack (and their
         # lexical parents)
-        self.cumulative_display = cumulative_display
+        self.cumulative_mode = cumulative_mode
 
         # each entry contains a dict with the information for a single
         # executed line
@@ -109,7 +109,7 @@ def __init__(self, finalizer_func, cumulative_display=False):
         self.cur_frame_id = 1
 
         # List of frames to KEEP AROUND after the function exits.
-        # If cumulative_display is True, then keep ALL frames in
+        # If cumulative_mode is True, then keep ALL frames in
         # zombie_frames; otherwise keep only frames where
         # nested functions were defined within them.
         self.zombie_frames = []
@@ -244,7 +244,7 @@ def interaction(self, frame, traceback, event_type):
           self.frame_ordered_ids[top_frame] = self.cur_frame_id
           self.cur_frame_id += 1
 
-          if self.cumulative_display:
+          if self.cumulative_mode:
             self.zombie_frames.append(top_frame)
 
 
@@ -465,6 +465,10 @@ def create_encoded_stack_entry(cur_frame):
           # frame_id is UNIQUE, so it can disambiguate recursive calls
           hash_str += '_f' + str(e['frame_id'])
 
+          # needed to refresh GUI display ...
+          if e['is_parent']:
+            hash_str += '_p'
+
           # TODO: this is no longer needed, right? (since frame_id is unique)
           #if e['parent_frame_id_list']:
           #  hash_str += '_p' + '_'.join([str(i) for i in e['parent_frame_id_list']])
@@ -596,8 +600,8 @@ def finalize(self):
 
 
 # the MAIN meaty function!!!
-def exec_script_str(script_str, finalizer_func):
-  logger = PGLogger(finalizer_func)
+def exec_script_str(script_str, cumulative_mode, finalizer_func):
+  logger = PGLogger(cumulative_mode, finalizer_func)
 
   try:
     logger._runscript(script_str)
diff --git a/PyTutorGAE/pythontutor.py b/PyTutorGAE/pythontutor.py
index 89e0078dc..9f40d6696 100644
--- a/PyTutorGAE/pythontutor.py
+++ b/PyTutorGAE/pythontutor.py
@@ -58,7 +58,13 @@ def json_finalizer(self, input_code, output_trace):
   def get(self):
     self.response.headers['Content-Type'] = 'application/json'
     self.response.headers['Cache-Control'] = 'no-cache'
-    pg_logger.exec_script_str(self.request.get('user_script'), self.json_finalizer)
+
+    # convert from string to a Python boolean ...
+    cumulative_mode = (self.request.get('cumulative_mode') == 'true')
+    
+    pg_logger.exec_script_str(self.request.get('user_script'),
+                              cumulative_mode,
+                              self.json_finalizer)
 
 
 app = webapp2.WSGIApplication([('/', TutorPage),
diff --git a/PyTutorGAE/tutor.html b/PyTutorGAE/tutor.html
index 14612741b..6010d8477 100644
--- a/PyTutorGAE/tutor.html
+++ b/PyTutorGAE/tutor.html
@@ -66,11 +66,12 @@
 
 
 
 

-
 
-
 

 
+
Display exited functions

+
+
 
Try these small examples:

 
 aliasing |
diff --git a/PyTutorGAE/web_exec.py b/PyTutorGAE/web_exec.py
index c699c70b2..f9b6a523a 100644
--- a/PyTutorGAE/web_exec.py
+++ b/PyTutorGAE/web_exec.py
@@ -21,5 +21,7 @@ def cgi_finalizer(input_code, output_trace):
 else:
   form = cgi.FieldStorage()
   user_script = form['user_script'].value
+  # convert from string to a Python boolean ...
+  cumulative_mode = (form['cumulative_mode'].value == 'true')
 
-pg_logger.exec_script_str(user_script, cgi_finalizer)
+pg_logger.exec_script_str(user_script, cumulative_mode, cgi_finalizer)

From 5365558735134817828647592382f5fdf93853b7 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 16 Aug 2012 07:35:56 -0700
Subject: [PATCH 122/502] more robust 'Generate URL' handling, including
 cumulative_mode

---
 PyTutorGAE/css/opt-frontend.css |  5 +++++
 PyTutorGAE/css/pytutor.css      |  6 ------
 PyTutorGAE/js/opt-frontend.js   | 25 +++++++++++++++++++------
 PyTutorGAE/js/pytutor.js        | 11 -----------
 PyTutorGAE/tutor.html           |  8 ++++++++
 5 files changed, 32 insertions(+), 23 deletions(-)

diff --git a/PyTutorGAE/css/opt-frontend.css b/PyTutorGAE/css/opt-frontend.css
index 68bdd71e1..7dcb24cbc 100644
--- a/PyTutorGAE/css/opt-frontend.css
+++ b/PyTutorGAE/css/opt-frontend.css
@@ -62,3 +62,8 @@ table#pyOutputPane {
   font-size: 12pt;
 }
 
+button.smallBtn {
+  font-size: 10pt;
+  padding: 3px;
+}
+
diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index 617e4d581..327be9b61 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -175,12 +175,6 @@ button.medBtn {
   padding: 3px;
 }
 
-button.smallBtn {
-  font-size: 10pt;
-  padding: 3px;
-}
-
-
 
 /* VCR control buttons for stepping through execution */
 
diff --git a/PyTutorGAE/js/opt-frontend.js b/PyTutorGAE/js/opt-frontend.js
index d53d5b2b8..8877c08a9 100644
--- a/PyTutorGAE/js/opt-frontend.js
+++ b/PyTutorGAE/js/opt-frontend.js
@@ -35,7 +35,6 @@ var appMode = 'edit'; // 'edit' or 'visualize'
 
 var preseededCode = null;     // if you passed in a 'code=' in the URL, then set this var
 var preseededCurInstr = null; // if you passed in a 'curInstr=' in the URL, then set this var
-var preseededMode = null;     // if you passed in a 'mode=' in the URL, then set this var
 
 
 var myVisualizer = null; // singleton ExecutionVisualizer instance
@@ -69,11 +68,15 @@ $(document).ready(function() {
   $(window).bind("hashchange", function(e) {
     appMode = $.bbq.getState('mode'); // assign this to the GLOBAL appMode
 
-    // yuck, globals!
-    preseededCode = $.bbq.getState('code');
-    preseededMode = $.bbq.getState('mode');
+    preseededCode = $.bbq.getState('code'); // yuck, global!
+    var preseededMode = $.bbq.getState('mode');
 
-    if (!preseededCurInstr) { // TODO: kinda gross hack
+    if ($.bbq.getState('cumulative_mode') == 'true') {
+      $('#cumulativeMode').prop('checked', true);
+    }
+
+    // only bother with curInstr when we're visualizing ...
+    if (!preseededCurInstr && preseededMode == 'visualize') { // TODO: kinda gross hack
       preseededCurInstr = Number($.bbq.getState('curInstr'));
     }
 
@@ -168,7 +171,7 @@ $(document).ready(function() {
                 alert(trace[0].exception_msg);
               }
               else {
-                alert("Whoa, unknown error! Reload to try again, or report a bug to philip@pgbovine.net");
+                alert("Whoa, unknown error! Reload to try again, or report a bug to philip@pgbovine.net\n\n(Click the 'Generate URL' button to include a unique URL in your email bug report.)");
               }
 
               $('#executeBtn').html("Visualize execution");
@@ -388,5 +391,15 @@ $(document).ready(function() {
     }
   });
 
+  $('#genUrlBtn').bind('click', function() {
+    var urlStr = $.param.fragment(window.location.href,
+                                  {code: pyInputCodeMirror.getValue(),
+                                   curInstr: (appMode == 'visualize') ? myVisualizer.curInstr : 0,
+                                   mode: appMode,
+                                   cumulative_mode: $('#cumulativeMode').prop('checked')
+                                  },
+                                  2);
+    $('#urlOutput').val(urlStr);
+  });
 });
 
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index beebb8739..adb258fd9 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -163,7 +163,6 @@ ExecutionVisualizer.prototype.render = function() {
         
\
         Program output:
\
         \
-        
 
\
         
\
       \
       \
@@ -219,14 +218,6 @@ ExecutionVisualizer.prototype.render = function() {
     this.domRoot.find('#progOutputs').hide();
   }
 
-  this.domRoot.find('#genUrlBtn').bind('click', function() {
-    var urlStr = $.param.fragment(window.location.href,
-                                  {code: myViz.curInputCode, curInstr: myViz.curInstr, mode: 'visualize'},
-                                  2);
-    myViz.domRoot.find('#urlOutput').val(urlStr);
-  });
-
-
   this.domRoot.find("#jmpFirstInstr").click(function() {
     myViz.curInstr = 0;
     myViz.updateOutput();
@@ -683,8 +674,6 @@ ExecutionVisualizer.prototype.updateOutput = function() {
 
   assert(this.curTrace);
 
-  this.domRoot.find('#urlOutput').val(''); // blank out
-
   var curEntry = this.curTrace[this.curInstr];
   var hasError = false;
 
diff --git a/PyTutorGAE/tutor.html b/PyTutorGAE/tutor.html
index 6010d8477..29f6bcf05 100644
--- a/PyTutorGAE/tutor.html
+++ b/PyTutorGAE/tutor.html
@@ -141,6 +141,14 @@
 
 \
           
\
             Click here to focus and then use the left and right arrow keys to
\
-            step through execution. Click on lines of code to set breakpoints.\
+            step through execution. Click on lines of code to set/unset breakpoints.\
           
\
           
\
           
\
@@ -229,17 +229,11 @@ ExecutionVisualizer.prototype.render = function() {
   });
 
   this.domRoot.find("#jmpStepBack").click(function() {
-    if (myViz.curInstr > 0) {
-      myViz.curInstr -= 1;
-      myViz.updateOutput();
-    }
+    myViz.stepBack();
   });
 
   this.domRoot.find("#jmpStepFwd").click(function() {
-    if (myViz.curInstr < myViz.curTrace.length - 1) {
-      myViz.curInstr += 1;
-      myViz.updateOutput();
-    }
+    myViz.stepForward();
   });
 
   // disable controls initially ...
@@ -314,58 +308,109 @@ ExecutionVisualizer.prototype.render = function() {
 };
 
 
+// find the previous/next breakpoint to c or return -1 if it doesn't exist
+ExecutionVisualizer.prototype.findPrevBreakpoint = function() {
+  var myViz = this;
+  var c = myViz.curInstr;
 
-ExecutionVisualizer.prototype.setKeyboardBindings = function() {
-  var myViz = this; // to prevent confusion of 'this' inside of nested functions
-
-  // find the previous/next breakpoint to c or return -1 if it doesn't exist
-  function findPrevBreakpoint(c) {
-    if (myViz.sortedBreakpointsList.length == 0) {
-      return -1;
+  if (myViz.sortedBreakpointsList.length == 0) {
+    return -1;
+  }
+  else {
+    for (var i = 1; i < myViz.sortedBreakpointsList.length; i++) {
+      var prev = myViz.sortedBreakpointsList[i-1];
+      var cur = myViz.sortedBreakpointsList[i];
+      if (c <= prev)
+        return -1;
+      if (cur >= c)
+        return prev;
     }
-    else {
-      for (var i = 1; i < myViz.sortedBreakpointsList.length; i++) {
-        var prev = myViz.sortedBreakpointsList[i-1];
-        var cur = myViz.sortedBreakpointsList[i];
-        if (c <= prev)
-          return -1;
-        if (cur >= c)
-          return prev;
-      }
 
-      // final edge case:
-      var lastElt = myViz.sortedBreakpointsList[myViz.sortedBreakpointsList.length - 1];
-      return (lastElt < c) ? lastElt : -1;
-    }
+    // final edge case:
+    var lastElt = myViz.sortedBreakpointsList[myViz.sortedBreakpointsList.length - 1];
+    return (lastElt < c) ? lastElt : -1;
   }
+}
+
+ExecutionVisualizer.prototype.findNextBreakpoint = function() {
+  var myViz = this;
+  var c = myViz.curInstr;
 
-  function findNextBreakpoint(c) {
-    if (myViz.sortedBreakpointsList.length == 0) {
-      return -1;
+  if (myViz.sortedBreakpointsList.length == 0) {
+    return -1;
+  }
+  // usability hack: if you're currently on a breakpoint, then
+  // single-step forward to the next execution point, NOT the next
+  // breakpoint. it's often useful to see what happens when the line
+  // at a breakpoint executes.
+  else if ($.inArray(c, myViz.sortedBreakpointsList) >= 0) {
+    return c + 1;
+  }
+  else {
+    for (var i = 0; i < myViz.sortedBreakpointsList.length - 1; i++) {
+      var cur = myViz.sortedBreakpointsList[i];
+      var next = myViz.sortedBreakpointsList[i+1];
+      if (c < cur)
+        return cur;
+      if (cur <= c && c < next) // subtle
+        return next;
     }
-    // usability hack: if you're currently on a breakpoint, then
-    // single-step forward to the next execution point, NOT the next
-    // breakpoint. it's often useful to see what happens when the line
-    // at a breakpoint executes.
-    else if ($.inArray(c, myViz.sortedBreakpointsList) >= 0) {
-      return c + 1;
+
+    // final edge case:
+    var lastElt = myViz.sortedBreakpointsList[myViz.sortedBreakpointsList.length - 1];
+    return (lastElt > c) ? lastElt : -1;
+  }
+}
+
+
+// returns true if action successfully taken
+ExecutionVisualizer.prototype.stepForward = function() {
+  var myViz = this;
+
+  if (myViz.curInstr < myViz.curTrace.length - 1) {
+    // if there is a next breakpoint, then jump to it ...
+    if (myViz.sortedBreakpointsList.length > 0) {
+      var nextBreakpoint = myViz.findNextBreakpoint();
+      if (nextBreakpoint != -1)
+        myViz.curInstr = nextBreakpoint;
+      else
+        myViz.curInstr += 1; // prevent "getting stuck" on a solitary breakpoint
     }
     else {
-      for (var i = 0; i < myViz.sortedBreakpointsList.length - 1; i++) {
-        var cur = myViz.sortedBreakpointsList[i];
-        var next = myViz.sortedBreakpointsList[i+1];
-        if (c < cur)
-          return cur;
-        if (cur <= c && c < next) // subtle
-          return next;
-      }
+      myViz.curInstr += 1;
+    }
+    myViz.updateOutput();
+    return true;
+  }
 
-      // final edge case:
-      var lastElt = myViz.sortedBreakpointsList[myViz.sortedBreakpointsList.length - 1];
-      return (lastElt > c) ? lastElt : -1;
+  return false;
+}
+
+// returns true if action successfully taken
+ExecutionVisualizer.prototype.stepBack = function() {
+  var myViz = this;
+
+  if (myViz.curInstr > 0) {
+    // if there is a prev breakpoint, then jump to it ...
+    if (myViz.sortedBreakpointsList.length > 0) {
+      var prevBreakpoint = myViz.findPrevBreakpoint();
+      if (prevBreakpoint != -1)
+        myViz.curInstr = prevBreakpoint;
+      else
+        myViz.curInstr -= 1; // prevent "getting stuck" on a solitary breakpoint
+    }
+    else {
+      myViz.curInstr -= 1;
     }
+    myViz.updateOutput();
+    return true;
   }
 
+  return false;
+}
+
+ExecutionVisualizer.prototype.setKeyboardBindings = function() {
+  var myViz = this; // to prevent confusion of 'this' inside of nested functions
 
 
   // Set keyboard event listeners for td#left_pane. Note that it must
@@ -379,39 +424,13 @@ ExecutionVisualizer.prototype.setKeyboardBindings = function() {
   leftTablePane.keydown(function(k) {
     if (!myViz.keyStuckDown) {
       if (k.keyCode == 37) { // left arrow
-        if (myViz.curInstr > 0) {
-          // if there is a prev breakpoint, then jump to it ...
-          if (myViz.sortedBreakpointsList.length > 0) {
-            var prevBreakpoint = findPrevBreakpoint(myViz.curInstr);
-            if (prevBreakpoint != -1)
-              myViz.curInstr = prevBreakpoint;
-            else
-              myViz.curInstr -= 1; // prevent keyboard keys from "getting stuck" on a solitary breakpoint
-          }
-          else {
-            myViz.curInstr -= 1;
-          }
-          myViz.updateOutput();
-
+        if (myViz.stepBack()) {
           k.preventDefault(); // don't horizontally scroll the display
           myViz.keyStuckDown = true;
         }
       }
       else if (k.keyCode == 39) { // right arrow
-        if (myViz.curInstr < myViz.curTrace.length - 1) {
-          // if there is a next breakpoint, then jump to it ...
-          if (myViz.sortedBreakpointsList.length > 0) {
-            var nextBreakpoint = findNextBreakpoint(myViz.curInstr);
-            if (nextBreakpoint != -1)
-              myViz.curInstr = nextBreakpoint;
-            else
-              myViz.curInstr += 1; // prevent keyboard keys from "getting stuck" on a solitary breakpoint
-          }
-          else {
-            myViz.curInstr += 1;
-          }
-          myViz.updateOutput();
-
+        if (myViz.stepForward()) {
           k.preventDefault(); // don't horizontally scroll the display
           myViz.keyStuckDown = true;
         }

From 03ff2037e8e094f455db805838b998b837d6386e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 17 Aug 2012 16:40:55 -0700
Subject: [PATCH 124/502] on mouseover of stack frame variables, highlight all
 pointer aliases

---
 PyTutorGAE/js/pytutor.js | 40 ++++++++++++++++++++++++++++++++++++----
 1 file changed, 36 insertions(+), 4 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 9ee8bc5d1..7596d274f 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1532,6 +1532,34 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   // Render globals and then stack frames using d3:
 
 
+  function highlightAliasedConnectors(d, i) {
+    // if this row contains a stack pointer, then highlight its arrow and
+    // ALL aliases that also point to the same heap object
+    var stackPtrId = $(this).find('div.stack_pointer').attr('id');
+    if (stackPtrId) {
+      var foundTargetId = null;
+      myViz.jsPlumbInstance.select({source: stackPtrId}).each(function(c) {foundTargetId = c.targetId;});
+
+      // use foundTargetId to highlight ALL ALIASES
+      myViz.jsPlumbInstance.select().each(function(c) {
+        if (c.targetId == foundTargetId) {
+          c.setHover(true);
+        }
+        else {
+          c.setHover(false);
+        }
+      });
+    }
+  }
+
+  function unhighlightAllConnectors(d, i) {
+    myViz.jsPlumbInstance.select().each(function(c) {
+      c.setHover(false);
+    });
+  }
+
+
+
   // render all global variables IN THE ORDER they were created by the program,
   // in order to ensure continuity:
 
@@ -1562,6 +1590,8 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   // ENTER
   globalsD3.enter()
     .append('tr')
+    .on('mouseover', highlightAliasedConnectors)
+    .on('mouseout',  unhighlightAllConnectors)
     .selectAll('td.stackFrameVar,td.stackFrameValue')
     .data(function(d, i){return d;}) /* map varname down both columns */
     .enter()
@@ -1606,7 +1636,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
             // make sure varname doesn't contain any weird
             // characters that are illegal for CSS ID's ...
             var varDivID = myViz.generateID('global__' + varnameToCssID(varname));
-            $(this).append('
 
');
+            $(this).append('
 
');
 
             assert(!connectionEndpointIDs.has(varDivID));
             var heapObjID = myViz.generateID('heap_object_' + getRefID(val));
@@ -1702,8 +1732,10 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   stackVarTable
     .enter()
-    .append('tr');
-  
+    .append('tr')
+    .on('mouseover', highlightAliasedConnectors)
+    .on('mouseout',  unhighlightAllConnectors);
+ 
 
   var stackVarTableCells = stackVarTable
     .selectAll('td.stackFrameVar,td.stackFrameValue')
@@ -1753,7 +1785,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
             // characters that are illegal for CSS ID's ...
             var varDivID = myViz.generateID(varnameToCssID(frame.unique_hash + '__' + varname));
 
-            $(this).append('
 
');
+            $(this).append('
 
');
 
             assert(!connectionEndpointIDs.has(varDivID));
             var heapObjID = myViz.generateID('heap_object_' + getRefID(val));

From 633d95aaf3e528e1a18ebb3ce62211e63196e4c0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 18 Aug 2012 22:57:46 -0700
Subject: [PATCH 125/502] convert tab into two spaces in code editor

---
 PyTutorGAE/js/opt-frontend.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/PyTutorGAE/js/opt-frontend.js b/PyTutorGAE/js/opt-frontend.js
index 8877c08a9..4f4abec76 100644
--- a/PyTutorGAE/js/opt-frontend.js
+++ b/PyTutorGAE/js/opt-frontend.js
@@ -56,7 +56,9 @@ $(document).ready(function() {
   pyInputCodeMirror = CodeMirror(document.getElementById('codeInputPane'), {
     mode: 'python',
     lineNumbers: true,
-    tabSize: 2
+    tabSize: 2,
+    // convert tab into two spaces:
+    extraKeys: {Tab: function(cm) {cm.replaceSelection("  ", "end");}}
   });
 
   pyInputCodeMirror.setSize(null, '450px');

From 403b605604ed3c95163d66a1a67e05acd070e1d0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 18 Aug 2012 23:16:24 -0700
Subject: [PATCH 126/502] minor

---
 PyTutorGAE/css/pytutor.css | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index 327be9b61..b7cdba610 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -643,3 +643,8 @@ div#submittedSolutionDisplay {
 /* necessary for CodeMirror line highlighting to work! */
 .CodeMirror .errorLine { background: #F89D99 !important; }
 
+
+/* darken slider handle a bit */
+.ui-slider .ui-slider-handle {
+  border: 1px solid #999;
+}

From 30adc0e03b5552e6f1d9e2138949fdbc0773e216 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 19 Aug 2012 16:03:59 -0700
Subject: [PATCH 127/502] first round of color makeover!

---
 PyTutorGAE/css/pytutor.css                    | 20 ++++--
 .../ui-lightness/jquery-ui-1.8.21.custom.css  |  7 +-
 PyTutorGAE/js/pytutor.js                      | 71 ++++++++++++++-----
 3 files changed, 75 insertions(+), 23 deletions(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index b7cdba610..8206a1bb5 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -26,7 +26,6 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 */
 
-
 /*
 Color scheme ideas: 
 
@@ -251,7 +250,6 @@ button.medBtn {
 
 table.listTbl {
   border: 0px solid black;
-  background-color: #F5F798;
   border-spacing: 0px;
 }
 
@@ -267,7 +265,6 @@ table.tupleTbl td.tupleHeader {
 }
 
 table.tupleTbl {
-  background-color: #F5F798;
   border-spacing: 0px;
   color: black;
 
@@ -277,6 +274,11 @@ table.tupleTbl {
 }
 
 
+table.listTbl, table.tupleTbl {
+  background-color: #ffffc6 /*#fcf08f*/ /*#f7fab9*/;
+}
+
+
 table.listTbl td.listElt {
   border-bottom: 1px solid #555555; /* must match td.listHeader border */
   border-left: 1px solid #555555; /* must match td.listHeader border */
@@ -444,7 +446,7 @@ div.stackFrame, div.zombieStackFrame {
   padding-right: 6px;
   padding-bottom: 4px;
   font-size: 10pt;
-  border-left: 2px solid #666666;
+  /*border-left: 2px solid #666666;*/
 }
 
 div.zombieStackFrame {
@@ -453,10 +455,16 @@ div.zombieStackFrame {
 }
 
 div.highlightedStackFrame {
-  background-color: #dddddd;
-  border-left: 2px solid #F15149;
+  background-color:  #c4e9ef /*#e4faeb*/ /*#b0e1e9*/ /*#6b83c1*/ /*#8cd7d1*/ /*#4ac0b6*/ /*#b0e1e9*/ /*#3e8dad*/ /*#dddddd*/;
+  /*border-left: 2px solid #F15149;*/
 }
 
+
+div.stackFrame, div.highlightedStackFrame {
+  border-left: 2px solid /*#d0d7d8*/ #a6b3b6 /*#7c8f94*/;
+}
+
+
 div.stackFrameHeader {
   font-family: Andale mono, monospace;
   font-size: 10pt;
diff --git a/PyTutorGAE/css/ui-lightness/jquery-ui-1.8.21.custom.css b/PyTutorGAE/css/ui-lightness/jquery-ui-1.8.21.custom.css
index f7b3d09ef..1dd6d8af4 100644
--- a/PyTutorGAE/css/ui-lightness/jquery-ui-1.8.21.custom.css
+++ b/PyTutorGAE/css/ui-lightness/jquery-ui-1.8.21.custom.css
@@ -65,8 +65,13 @@
 ----------------------------------*/
 .ui-state-default, .ui-widget-content .ui-state-default, .ui-widget-header .ui-state-default { border: 1px solid #cccccc; background: #f6f6f6 url(images/ui-bg_glass_100_f6f6f6_1x400.png) 50% 50% repeat-x; font-weight: bold; color: #1c94c4; }
 .ui-state-default a, .ui-state-default a:link, .ui-state-default a:visited { color: #1c94c4; text-decoration: none; }
+
+/* pgbovine - eliminate hover colors */
+/*
 .ui-state-hover, .ui-widget-content .ui-state-hover, .ui-widget-header .ui-state-hover, .ui-state-focus, .ui-widget-content .ui-state-focus, .ui-widget-header .ui-state-focus { border: 1px solid #fbcb09; background: #fdf5ce url(images/ui-bg_glass_100_fdf5ce_1x400.png) 50% 50% repeat-x; font-weight: bold; color: #c77405; }
 .ui-state-hover a, .ui-state-hover a:hover { color: #c77405; text-decoration: none; }
+*/
+
 .ui-state-active, .ui-widget-content .ui-state-active, .ui-widget-header .ui-state-active { border: 1px solid #fbd850; background: #ffffff url(images/ui-bg_glass_65_ffffff_1x400.png) 50% 50% repeat-x; font-weight: bold; color: #eb8f00; }
 .ui-state-active a, .ui-state-active a:link, .ui-state-active a:visited { color: #eb8f00; text-decoration: none; }
 .ui-widget :active { outline: none; }
@@ -307,4 +312,4 @@
 .ui-slider-vertical .ui-slider-handle { left: -.3em; margin-left: 0; margin-bottom: -.6em; }
 .ui-slider-vertical .ui-slider-range { left: 0; width: 100%; }
 .ui-slider-vertical .ui-slider-range-min { bottom: 0; }
-.ui-slider-vertical .ui-slider-range-max { top: 0; }
\ No newline at end of file
+.ui-slider-vertical .ui-slider-range-max { top: 0; }
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 7596d274f..918393604 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -72,9 +72,9 @@ function ExecutionVisualizer(domRootID, dat, params) {
   // cool, we can create a separate jsPlumb instance for each visualization:
   this.jsPlumbInstance = jsPlumb.getInstance({
     Endpoint: ["Dot", {radius:3}],
-    EndpointStyles: [{fillStyle: darkBlue}, {fillstyle: null} /* make right endpoint invisible */],
+    EndpointStyles: [{fillStyle: connectorBaseColor}, {fillstyle: null} /* make right endpoint invisible */],
     Anchors: ["RightMiddle", "LeftMiddle"],
-    PaintStyle: {lineWidth:1, strokeStyle: darkBlue},
+    PaintStyle: {lineWidth:1, strokeStyle: connectorBaseColor},
 
     // bezier curve style:
     //Connector: [ "Bezier", { curviness:15 }], /* too much 'curviness' causes lines to run together */
@@ -83,8 +83,8 @@ function ExecutionVisualizer(domRootID, dat, params) {
     // state machine curve style:
     Connector: [ "StateMachine" ],
     Overlays: [[ "Arrow", { length: 10, width:7, foldback:0.55, location:1 }]],
-    EndpointHoverStyles: [{fillStyle: pinkish}, {fillstyle: null} /* make right endpoint invisible */],
-    HoverPaintStyle: {lineWidth:2, strokeStyle: pinkish},
+    EndpointHoverStyles: [{fillStyle: connectorHighlightColor}, {fillstyle: null} /* make right endpoint invisible */],
+    HoverPaintStyle: {lineWidth: 1, strokeStyle: connectorHighlightColor},
   });
 
 
@@ -782,7 +782,7 @@ ExecutionVisualizer.prototype.updateOutput = function() {
       .style('background-color', function(d) {
         if (d.lineNumber == curEntry.line) {
           d.backgroundColor = hasError ? errorColor :
-                                         (isTerminated ?  lightBlue : lightLineColor);
+                                         (isTerminated ?  terminatedLineColor : highlightedLineColor);
         }
         else {
           d.backgroundColor = null;
@@ -792,7 +792,7 @@ ExecutionVisualizer.prototype.updateOutput = function() {
       })
       .style('border-top', function(d) {
         if ((d.lineNumber == curEntry.line) && !hasError && !isTerminated) {
-          return '1px solid ' + errorColor;
+          return '1px solid ' + highlightedLineTopBorderColor;
         }
         else {
           // put a default white top border to keep space usage consistent
@@ -1842,8 +1842,8 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       // if this connector starts in the selected stack frame ...
       if (stackFrameDiv.attr('id') == frameID) {
         // then HIGHLIGHT IT!
-        c.setPaintStyle({lineWidth:1, strokeStyle: darkBlue});
-        c.endpoints[0].setPaintStyle({fillStyle: darkBlue});
+        c.setPaintStyle({lineWidth:1, strokeStyle: connectorBaseColor});
+        c.endpoints[0].setPaintStyle({fillStyle: connectorBaseColor});
         //c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
 
         $(c.canvas).css("z-index", 1000); // ... and move it to the VERY FRONT
@@ -1854,8 +1854,8 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       }
       else {
         // else unhighlight it
-        c.setPaintStyle({lineWidth:1, strokeStyle: lightGray});
-        c.endpoints[0].setPaintStyle({fillStyle: lightGray});
+        c.setPaintStyle({lineWidth:1, strokeStyle: connectorInactiveColor});
+        c.endpoints[0].setPaintStyle({fillStyle: connectorInactiveColor});
         //c.endpoints[1].setVisible(false, true, true); // JUST set right endpoint to be invisible
 
         $(c.canvas).css("z-index", 0);
@@ -1894,23 +1894,62 @@ ExecutionVisualizer.prototype.redrawConnectors = function() {
 // Utilities
 
 
+
+
 /* colors - see pytutor.css */
 var lightYellow = '#F5F798';
-var lightLineColor = '#FFFFCC';
+
+//var highlightedLineColor = '#FFFFCC';
+//var highlightedLineColor = '#88e777';
+//var highlightedLineColor = '#9beb8d';
+//var highlightedLineColor = '#aeefa2';
+//var highlightedLineColor = '#c1f2b8';
+//var highlightedLineColor = '#c1f2b8';
+//var highlightedLineColor = '#d0d7d8';
+//var highlightedLineColor = '#b8f2cc';
+//var highlightedLineColor = '#e3faeb';
+var highlightedLineColor = '#cef6db';
+
+
+//var highlightedLineTopBorderColor = '#3b5998';
+var highlightedLineTopBorderColor = '#005583';
+
+//var visitedLineColor = '#3D58A2';
+var visitedLineColor = highlightedLineTopBorderColor;
+
 var errorColor = '#F87D76';
-var visitedLineColor = '#3D58A2';
 
-var lightGray = "#cccccc";
+//var terminatedLineColor = "#899CD1";
+//var terminatedLineColor = '#3e8dad';
+//var terminatedLineColor = '#4ac0b6';
+//var terminatedLineColor = '#77e69e';
+//var terminatedLineColor = '#8deaad';
+var terminatedLineColor = '#a2eebd';
+
 var darkBlue = "#3D58A2";
 var medBlue = "#41507A";
 var medLightBlue = "#6F89D1";
-var lightBlue = "#899CD1";
 var pinkish = "#F15149";
 var lightPink = "#F89D99";
 var darkRed = "#9D1E18";
 
-var breakpointColor = pinkish;
-var hoverBreakpointColor = medLightBlue;
+//var connectorBaseColor = darkBlue;
+//var connectorBaseColor = "#005583";
+//var connectorBaseColor = "#425c9d";
+//var connectorBaseColor = "#3b5998";
+var connectorBaseColor = '#005583';
+
+//var connectorHighlightColor = pinkish;
+var connectorHighlightColor = '#d03939';
+
+var connectorInactiveColor = '#cccccc';
+//var connectorInactiveColor = '#ecf2f5';
+
+//var breakpointColor = pinkish;
+var breakpointColor = connectorHighlightColor;
+
+//var hoverBreakpointColor = medLightBlue;
+var hoverBreakpointColor = connectorBaseColor;
 
 
 function assert(cond) {

From 3a7bcbf9e49842cbdf30a2f3e50ecd8f77d95bf4 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 19 Aug 2012 16:51:06 -0700
Subject: [PATCH 128/502] more goodies

---
 PyTutorGAE/css/pytutor.css       | 33 +++++++++++++++++---------------
 PyTutorGAE/embedding-examples.js | 10 +++++++---
 PyTutorGAE/embedding-test.html   |  4 ++--
 3 files changed, 27 insertions(+), 20 deletions(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index 8206a1bb5..776b54b95 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -157,7 +157,8 @@ div#editCodeLinkDiv {
 
 
 #errorOutput {
-  background-color: #F87D76;
+  color: #d03939;
+  /*background-color: #F87D76;*/
   font-size: 12pt;
   padding: 2px;
   line-height: 1.5em;
@@ -239,12 +240,12 @@ button.medBtn {
 .retval,
 .returnWarning {
   font-size: 9pt;
-  color: #9d1e18;
+  /*color: #9d1e18;*/
 }
 
 .returnWarning {
   padding-top: 10px;
-  color: #9d1e18;
+  /*color: #9d1e18;*/
 }
 
 
@@ -274,10 +275,18 @@ table.tupleTbl {
 }
 
 
-table.listTbl, table.tupleTbl {
+table.listTbl, table.tupleTbl, table.setTbl {
   background-color: #ffffc6 /*#fcf08f*/ /*#f7fab9*/;
 }
 
+table.dictTbl,
+table.dictTbl td.dictVal,
+table.instTbl,
+table.instTbl td.instVal {
+  background-color: #ffffc6 /*#fcf08f*/ /*#f7fab9*/;
+  /*background-color: #F5F798;*/
+}
+
 
 table.listTbl td.listElt {
   border-bottom: 1px solid #555555; /* must match td.listHeader border */
@@ -309,7 +318,7 @@ table.tupleTbl td.tupleElt {
 
 table.setTbl {
   border: 1px solid #555555;
-  background-color: #F5F798;
+  /*background-color: #F5F798;*/
   border-spacing: 0px;
   text-align: center;
 }
@@ -331,13 +340,6 @@ table.instTbl td.instKey {
   background-color: white;
 }
 
-table.dictTbl,
-table.dictTbl td.dictVal,
-table.instTbl,
-table.instTbl td.instVal {
-  background-color: #F5F798;
-}
-
 
 table.dictTbl td.dictKey,
 table.classTbl td.classKey,
@@ -451,17 +453,18 @@ div.stackFrame, div.zombieStackFrame {
 
 div.zombieStackFrame {
   border-left: 1px dotted #aaa; /* make zombie borders thinner */
-  color: #aaa;
+  color: #c0c0c0 /*#aaa*/;
 }
 
 div.highlightedStackFrame {
-  background-color:  #c4e9ef /*#e4faeb*/ /*#b0e1e9*/ /*#6b83c1*/ /*#8cd7d1*/ /*#4ac0b6*/ /*#b0e1e9*/ /*#3e8dad*/ /*#dddddd*/;
+  background-color: #a8d0df /*#c1ebf7*/  /*#8bc0d5*/ /*#afd1d7*/ /*#95c2ca*/ /*#aae4f4*/ /*#c4e9ef*/ /*#c1c7e5*/ /*#afcede*/ /*#9dc3d6*/ /*#b8f0ff - BAD*/ /*#e4faeb*/ /*#b0e1e9*/ /*#6b83c1*/ /*#8cd7d1*/ /*#4ac0b6*/ /*#b0e1e9*/ /*#3e8dad*/ /*#dddddd*/;
   /*border-left: 2px solid #F15149;*/
 }
 
 
+
 div.stackFrame, div.highlightedStackFrame {
-  border-left: 2px solid /*#d0d7d8*/ #a6b3b6 /*#7c8f94*/;
+  border-left: 2px solid #a6b3b6 /*#8a9b9f*/ /*#98a7ab*/ /*#d0d7d8*/ /*#7c8f94*/;
 }
 
 
diff --git a/PyTutorGAE/embedding-examples.js b/PyTutorGAE/embedding-examples.js
index 9236cb9b5..e8d5e6589 100644
--- a/PyTutorGAE/embedding-examples.js
+++ b/PyTutorGAE/embedding-examples.js
@@ -1,5 +1,9 @@
 // Traces generated by generate_json_trace.py
 
+var stuff = {"code": "# Philip's 10-minute intro to Python\n\n# numbers!\nage = 26\npi = 3.14159\n\n# strings!\ns = 'Rutherford Birchard Hayes'\ntokens = s.split()\nfirstName = tokens[0]\nmiddleName = tokens[1]\nlastName = tokens[2]\ns2 = firstName + ' ' + middleName + ' ' + lastName\n\n# 'if' statement - indentation matters!\nif (s == s2):\n    print 'yes!!!'\nelse:\n    print 'nooooooo'\n\n# list (mutable sequence)\nbeatles = ['John', 'Paul', 'George']\nbeatles.append('Ringo')\n\n# 'for' loop - indentation matters!\nfor b in beatles:\n    print 'Hello', b\n\n# tuple (immutable sequence)\nages = (18, 21, 28, 21, 22, 18, 19, 34, 9)\n\n# set (no order, no duplicates)\nuniqueAges = set(ages)\nuniqueAges.add(18) # already in set, no effect\nuniqueAges.remove(21)\n\n# no guaranteed order when iterating over a set\nfor thisAge in uniqueAges:\n    print thisAge\n\n# testing set membership\nif 18 in uniqueAges:\n    print 'There is an 18-year-old present!'\n\n# sorting\nbeatles.sort() # in-place\norderedUniqueAges = sorted(uniqueAges) # new list\n\n# dict - mapping unique keys to values\nnetWorth = {}\nnetWorth['Donald Trump'] = 3000000000\nnetWorth['Bill Gates'] = 58000000000\nnetWorth['Tom Cruise'] = 40000000\nnetWorth['Joe Postdoc'] = 20000\n\n# iterating over key-value pairs:\nfor (person, worth) in netWorth.iteritems():\n    if worth < 1000000:\n        print 'haha', person, 'is not a millionaire'\n\n# testing dict membership\nif 'Tom Cruise' in netWorth:\n    print 'show me the money!'\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 4, "event": "step_line"}, {"ordered_globals": ["age"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"age": 26}, "heap": {}, "line": 5, "event": "step_line"}, {"ordered_globals": ["age", "pi"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"age": 26, "pi": 3.14159}, "heap": {}, "line": 8, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"age": 26, "pi": 3.14159, "s": "Rutherford Birchard Hayes"}, "heap": {}, "line": 9, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"tokens": ["REF", 1], "age": 26, "pi": 3.14159, "s": "Rutherford Birchard Hayes"}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 10, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"tokens": ["REF", 1], "age": 26, "pi": 3.14159, "s": "Rutherford Birchard Hayes", "firstName": "Rutherford"}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 11, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"firstName": "Rutherford", "middleName": "Birchard", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 12, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 13, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 16, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 17, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2"], "stdout": "yes!!!\n", "func_name": "", "stack_to_render": [], "globals": {"firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 22, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles"], "stdout": "yes!!!\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George"]}, "line": 23, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles"], "stdout": "yes!!!\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 26, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "John", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 27, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "John", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 26, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Paul", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 27, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\nHello Paul\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Paul", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 26, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\nHello Paul\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "George", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 27, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "George", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 26, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 27, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 26, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 30, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9]}, "line": 33, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 21, 22, 28]}, "line": 34, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 21, 22, 28]}, "line": 35, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": 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"John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 39, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 34, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 38, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 9, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 39, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 9, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 38, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 18, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 39, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 18, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 38, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 19, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 39, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 19, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 38, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 22, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 39, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", 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19, 22, 28]}, "line": 38, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 28, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 42, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 28, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 43, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], 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["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Donald Trump", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 3000000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 58, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Donald Trump", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 3000000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 57, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Bill Gates", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 58000000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 58, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Bill Gates", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 58000000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 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["LIST", 1, 2, 3, 4, 5, "hello"], "5": ["FUNCTION", "foo(lst)", null], "6": ["FUNCTION", "bar(myLst)", null]}, "line": 19, "event": "return"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n[1, 2, 3, 4, 5, 'hello']\n", "func_name": "", "stack_to_render": [], "globals": {"y": "hello", "x": ["REF", 3], "z": ["REF", 4], "bar": ["REF", 6], "foo": ["REF", 5]}, "heap": {"3": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "4": ["LIST", 1, 2, 3, 4, 5, "hello"], "5": ["FUNCTION", "foo(lst)", null], "6": ["FUNCTION", "bar(myLst)", null]}, "line": 25, "event": "return"}]};
 
 var aliasing5 = {"code": "x = None\nfor i in range(5, 0, -1):\n  x = (i, x)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 1, "event": "step_line"}, {"ordered_globals": ["x"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"x": null}, "heap": {}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 5, "x": null}, "heap": {}, "line": 3, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 5, "x": ["REF", 1]}, "heap": {"1": ["TUPLE", 5, null]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 4, "x": ["REF", 1]}, "heap": {"1": ["TUPLE", 5, null]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 4, "x": ["REF", 2]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 3, "x": ["REF", 2]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 3, "x": ["REF", 3]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 2, "x": ["REF", 3]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 2, "x": ["REF", 4]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]], "4": ["TUPLE", 2, ["REF", 3]]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 1, "x": ["REF", 4]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]], "4": ["TUPLE", 2, ["REF", 3]]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 1, "x": ["REF", 5]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]], "4": ["TUPLE", 2, ["REF", 3]], "5": ["TUPLE", 1, ["REF", 4]]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["x", "i"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"i": 1, "x": ["REF", 5]}, "heap": {"1": ["TUPLE", 5, null], "2": ["TUPLE", 4, ["REF", 1]], "3": ["TUPLE", 3, ["REF", 2]], "4": ["TUPLE", 2, ["REF", 3]], "5": ["TUPLE", 1, ["REF", 4]]}, "line": 2, "event": "return"}]};
@@ -7,18 +11,18 @@ var aliasing5 = {"code": "x = None\nfor i in range(5, 0, -1):\n  x = (i, x)\n",
 var hanoi = {"code": "# move a stack of n disks from stack a to stack b,\n# using tmp as a temporary stack\ndef TowerOfHanoi(n, a, b, tmp):\n    if n == 1:\n        b.append(a.pop())\n    else:\n        TowerOfHanoi(n-1, a, tmp, b)\n        b.append(a.pop())\n        TowerOfHanoi(n-1, tmp, b, a)\n        \nstack1 = [4,3,2,1]\nstack2 = []\nstack3 = []\n      \n# transfer stack1 to stack3 using Tower of Hanoi rules\nTowerOfHanoi(len(stack1), stack1, stack3, stack2)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 3, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"TowerOfHanoi": ["REF", 1]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null]}, "line": 11, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1]}, "line": 12, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"]}, "line": 13, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 16, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 3, "event": "call"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 7, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 4], "a": ["REF", 2], "b": ["REF", 3], "n": 3}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 3, "event": "call"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": 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4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i2", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i3", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 4], "a": ["REF", 2], "__return__": null, "b": ["REF", 3], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 2], "3": ["LIST", 1], "4": ["LIST", 4, 3]}, "line": 5, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i2", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 2], "3": ["LIST", 1], "4": ["LIST", 4, 3]}, "line": 8, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i2", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST", 1], "4": ["LIST", 4, 3, 2]}, "line": 9, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i2", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i3", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST", 1], "4": ["LIST", 4, 3, 2]}, "line": 3, "event": "call"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i2", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i3", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST", 1], "4": ["LIST", 4, 3, 2]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i2", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i3", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST", 1], "4": ["LIST", 4, 3, 2]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i2", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i3", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "__return__": null, "b": ["REF", 4], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 5, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i2", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "__return__": null, "b": ["REF", 4], "n": 2}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 9, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "__return__": null, "b": ["REF", 4], "n": 3}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 9, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "__return__": null, "b": ["REF", 4], "n": 4}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 9, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 16, "event": "return"}]};
 
 
-var aliasingViz = null;
+var stuffViz = null;
 var aliasing5Viz = null;
 var hanoiViz = null;
 
 $(document).ready(function() {
-  aliasingViz = new ExecutionVisualizer('aliasingDiv', aliasing, {hideOutput: true, codeDivHeight: 150, editCodeBaseURL: 'http://localhost:8080/'});
+  stuffViz = new ExecutionVisualizer('closure4Div', stuff, {hideOutput: true, jumpToEnd: true, editCodeBaseURL: 'http://localhost:8080/'});
   aliasing5Viz = new ExecutionVisualizer('aliasing5Div', aliasing5, {hideOutput: true, jumpToEnd: true, editCodeBaseURL: 'http://localhost:8080/'});
   hanoiViz = new ExecutionVisualizer('hanoiDiv', hanoi, {startingInstruction: 45, hideOutput: true, editCodeBaseURL: 'http://localhost:8080/'});
 
   // redraw connector arrows on window resize
   $(window).resize(function() {
-    aliasingViz.redrawConnectors();
+    stuffViz.redrawConnectors();
     aliasing5Viz.redrawConnectors();
     hanoiViz.redrawConnectors();
   });
diff --git a/PyTutorGAE/embedding-test.html b/PyTutorGAE/embedding-test.html
index de203486f..769e628b4 100644
--- a/PyTutorGAE/embedding-test.html
+++ b/PyTutorGAE/embedding-test.html
@@ -23,9 +23,9 @@
 
 
 
-
Aliasing:

+
Closures:

 
-

+

 
 
Aliasing 5:

 

From 9dd6590874ed435a6b8dbef68a29fb2682c67d11 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 19 Aug 2012 16:53:26 -0700
Subject: [PATCH 129/502] aoooooga!

---
 PyTutorGAE/css/pytutor.css | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index 776b54b95..1769fc66d 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -457,7 +457,7 @@ div.zombieStackFrame {
 }
 
 div.highlightedStackFrame {
-  background-color: #a8d0df /*#c1ebf7*/  /*#8bc0d5*/ /*#afd1d7*/ /*#95c2ca*/ /*#aae4f4*/ /*#c4e9ef*/ /*#c1c7e5*/ /*#afcede*/ /*#9dc3d6*/ /*#b8f0ff - BAD*/ /*#e4faeb*/ /*#b0e1e9*/ /*#6b83c1*/ /*#8cd7d1*/ /*#4ac0b6*/ /*#b0e1e9*/ /*#3e8dad*/ /*#dddddd*/;
+  background-color: #c5dfea /*#a8d0df*/ /*#c1ebf7*/   /*#8bc0d5*/ /*#afd1d7*/ /*#95c2ca*/ /*#aae4f4*/ /*#c4e9ef*/ /*#c1c7e5*/ /*#afcede*/ /*#9dc3d6*/ /*#b8f0ff - BAD*/ /*#e4faeb*/ /*#b0e1e9*/ /*#6b83c1*/ /*#8cd7d1*/ /*#4ac0b6*/ /*#b0e1e9*/ /*#3e8dad*/ /*#dddddd*/;
   /*border-left: 2px solid #F15149;*/
 }
 

From 348df7e162728a16a0bd8e7a58f572e7234598ba Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 19 Aug 2012 17:13:40 -0700
Subject: [PATCH 130/502] peachly

---
 PyTutorGAE/css/pytutor.css       | 22 ++++++++++------------
 PyTutorGAE/embedding-examples.js |  1 +
 2 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index 1769fc66d..b36b71b2e 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -279,14 +279,6 @@ table.listTbl, table.tupleTbl, table.setTbl {
   background-color: #ffffc6 /*#fcf08f*/ /*#f7fab9*/;
 }
 
-table.dictTbl,
-table.dictTbl td.dictVal,
-table.instTbl,
-table.instTbl td.instVal {
-  background-color: #ffffc6 /*#fcf08f*/ /*#f7fab9*/;
-  /*background-color: #F5F798;*/
-}
-
 
 table.listTbl td.listElt {
   border-bottom: 1px solid #555555; /* must match td.listHeader border */
@@ -329,15 +321,20 @@ table.setTbl td.setElt {
 
 
 table.dictTbl {
-  border: 1px solid #555555;
-  border-collapse: collapse;
+  /*border: 1px solid #555555;*/
+  /*border-collapse: collapse;*/
   border-spacing: 1px;
 }
 
 
 table.dictTbl td.dictKey,
 table.instTbl td.instKey {
-  background-color: white;
+  background-color: #faebbf /*#fde9bb*/ /*#fce1a2*/ /*#ffff78*/ /*#ffffc6*/;
+}
+
+table.dictTbl td.dictVal,
+table.instTbl td.instVal {
+  background-color: #ffffc6;
 }
 
 
@@ -379,11 +376,12 @@ table.classTbl td.classVal {
 table.instTbl {
   border-collapse: collapse;
   border-spacing: 1px;
+  border: 1px #555555 solid;
 }
 
 table.dictTbl tr.dictEntry,
 table.instTbl tr.instEntry {
-  border: 1px #555555 solid;
+  /*border: 1px #555555 solid;*/
 }
 
 
diff --git a/PyTutorGAE/embedding-examples.js b/PyTutorGAE/embedding-examples.js
index e8d5e6589..6e1053553 100644
--- a/PyTutorGAE/embedding-examples.js
+++ b/PyTutorGAE/embedding-examples.js
@@ -2,6 +2,7 @@
 
 var stuff = {"code": "# Philip's 10-minute intro to Python\n\n# numbers!\nage = 26\npi = 3.14159\n\n# strings!\ns = 'Rutherford Birchard Hayes'\ntokens = s.split()\nfirstName = tokens[0]\nmiddleName = tokens[1]\nlastName = tokens[2]\ns2 = firstName + ' ' + middleName + ' ' + lastName\n\n# 'if' statement - indentation matters!\nif (s == s2):\n    print 'yes!!!'\nelse:\n    print 'nooooooo'\n\n# list (mutable sequence)\nbeatles = ['John', 'Paul', 'George']\nbeatles.append('Ringo')\n\n# 'for' loop - indentation matters!\nfor b in beatles:\n    print 'Hello', b\n\n# tuple (immutable sequence)\nages = (18, 21, 28, 21, 22, 18, 19, 34, 9)\n\n# set (no order, no duplicates)\nuniqueAges = set(ages)\nuniqueAges.add(18) # already in set, no effect\nuniqueAges.remove(21)\n\n# no guaranteed order when iterating over a set\nfor thisAge in uniqueAges:\n    print thisAge\n\n# testing set membership\nif 18 in uniqueAges:\n    print 'There is an 18-year-old present!'\n\n# sorting\nbeatles.sort() # in-place\norderedUniqueAges = sorted(uniqueAges) # new list\n\n# dict - mapping unique keys to values\nnetWorth = {}\nnetWorth['Donald Trump'] = 3000000000\nnetWorth['Bill Gates'] = 58000000000\nnetWorth['Tom Cruise'] = 40000000\nnetWorth['Joe Postdoc'] = 20000\n\n# iterating over key-value pairs:\nfor (person, worth) in netWorth.iteritems():\n    if worth < 1000000:\n        print 'haha', person, 'is not a millionaire'\n\n# testing dict membership\nif 'Tom Cruise' in netWorth:\n    print 'show me the money!'\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 4, "event": "step_line"}, {"ordered_globals": ["age"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"age": 26}, "heap": {}, "line": 5, "event": "step_line"}, {"ordered_globals": ["age", "pi"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"age": 26, "pi": 3.14159}, "heap": {}, "line": 8, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"age": 26, "pi": 3.14159, "s": "Rutherford Birchard Hayes"}, "heap": {}, "line": 9, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"tokens": ["REF", 1], "age": 26, "pi": 3.14159, "s": "Rutherford Birchard Hayes"}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 10, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"tokens": ["REF", 1], "age": 26, "pi": 3.14159, "s": "Rutherford Birchard Hayes", "firstName": "Rutherford"}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 11, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"firstName": "Rutherford", "middleName": "Birchard", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 12, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 13, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 16, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 17, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2"], "stdout": "yes!!!\n", "func_name": "", "stack_to_render": [], "globals": {"firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 22, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles"], "stdout": "yes!!!\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George"]}, "line": 23, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles"], "stdout": "yes!!!\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 26, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "John", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 27, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "John", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 26, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Paul", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 27, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\nHello Paul\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Paul", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 26, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\nHello Paul\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "George", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 27, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "George", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 26, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 27, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 26, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 30, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9]}, "line": 33, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 21, 22, 28]}, "line": 34, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 21, 22, 28]}, "line": 35, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 38, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 34, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 39, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 34, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 38, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 9, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 39, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 9, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 38, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 18, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 39, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 18, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 38, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 19, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 39, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 19, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 38, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 22, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 39, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", 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19, 22, 28]}, "line": 38, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 28, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 42, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 28, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 43, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 28, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 46, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, 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["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Donald Trump", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 3000000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 58, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Donald Trump", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 3000000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 57, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Bill Gates", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 58000000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 58, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Bill Gates", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 58000000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 57, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Joe Postdoc", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 20000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 58, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Joe Postdoc", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 20000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 59, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\nhaha Joe Postdoc is not a millionaire\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Joe Postdoc", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 20000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 57, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\nhaha Joe Postdoc is not a millionaire\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Tom Cruise", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 40000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 58, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\nhaha Joe Postdoc is not a millionaire\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Tom Cruise", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 40000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 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40000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 62, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\nhaha Joe Postdoc is not a millionaire\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Tom Cruise", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 40000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 63, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\nhaha Joe Postdoc is not a millionaire\nshow me the money!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Tom Cruise", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 40000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 63, "event": "return"}]}
 
+var stuff = {"code": "# Object-oriented programming intro\n# Adapted from MIT 6.01 course notes (Section 3.5)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\nclass Staff601:\n    course = '6.01'\n    building = 34\n    room = 501\n\n    def salutation(self):\n        return self.role + ' ' + self.name\n\npat = Staff601()\nprint pat.course\n\npat.name = 'Pat'\npat.age = 60\npat.role = 'Professor'\n\nprint pat.building\npat.building = 32\nprint pat.building\n\nprint pat.salutation()\nprint Staff601.salutation(pat)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 5, "event": "step_line"}, {"ordered_globals": [], "stdout": "", "func_name": "Staff601", "stack_to_render": [{"frame_id": 1, "encoded_locals": {}, "is_highlighted": true, "is_parent": false, "func_name": "Staff601", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "Staff601_f1", "ordered_varnames": []}], "globals": {}, "heap": {}, "line": 5, "event": "call"}, {"ordered_globals": [], "stdout": "", "func_name": "Staff601", "stack_to_render": [{"frame_id": 1, "encoded_locals": {}, "is_highlighted": true, "is_parent": false, "func_name": "Staff601", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "Staff601_f1", "ordered_varnames": []}], "globals": {}, "heap": {}, "line": 5, "event": "step_line"}, {"ordered_globals": [], "stdout": "", "func_name": "Staff601", "stack_to_render": [{"frame_id": 1, "encoded_locals": {}, "is_highlighted": true, "is_parent": false, "func_name": "Staff601", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "Staff601_f1", "ordered_varnames": []}], "globals": {}, "heap": {}, "line": 6, "event": "step_line"}, {"ordered_globals": [], "stdout": "", "func_name": "Staff601", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"course": "6.01"}, "is_highlighted": true, "is_parent": false, "func_name": "Staff601", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "Staff601_f1", "ordered_varnames": ["course"]}], "globals": {}, "heap": {}, "line": 7, "event": "step_line"}, {"ordered_globals": [], "stdout": "", "func_name": "Staff601", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01"}, "is_highlighted": true, "is_parent": false, "func_name": "Staff601", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "Staff601_f1", "ordered_varnames": ["building", "course"]}], "globals": {}, "heap": {}, "line": 8, "event": "step_line"}, {"ordered_globals": [], "stdout": "", "func_name": "Staff601", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01", "room": 501}, "is_highlighted": true, "is_parent": false, "func_name": "Staff601", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "Staff601_f1", "ordered_varnames": ["building", "course", "room"]}], "globals": {}, "heap": {}, "line": 10, "event": "step_line"}, {"ordered_globals": [], "stdout": "", "func_name": "Staff601", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01", "salutation": ["REF", 1], "room": 501, "__return__": ["REF", 2]}, "is_highlighted": true, "is_parent": true, "func_name": "Staff601", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "Staff601_f1_p", "ordered_varnames": ["building", "course", "room", "salutation", "__return__"]}], "globals": {}, "heap": {"1": ["FUNCTION", "salutation(self)", 1], "2": ["DICT", ["building", 34], ["room", 501], ["course", "6.01"], ["salutation", ["REF", 1]]]}, "line": 10, "event": "return"}, {"ordered_globals": ["Staff601"], "stdout": "", "func_name": "", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01", "salutation": ["REF", 1], "room": 501, "__return__": ["REF", 2]}, "is_highlighted": false, "is_parent": true, "func_name": "Staff601", "is_zombie": true, "parent_frame_id_list": [], "unique_hash": "Staff601_f1_p_z", "ordered_varnames": ["building", "course", "room", "salutation", "__return__"]}], "globals": {"Staff601": ["REF", 3]}, "heap": {"1": ["FUNCTION", "salutation(self)", 1], "2": ["DICT", ["building", 34], ["room", 501], ["course", "6.01"], ["salutation", ["REF", 1]], ["__doc__", null]], "3": ["CLASS", "Staff601", [], ["building", 34], ["course", "6.01"], ["room", 501], ["salutation", ["REF", 1]]]}, "line": 13, "event": "step_line"}, {"ordered_globals": ["Staff601", "pat"], "stdout": "", "func_name": "", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01", "salutation": ["REF", 1], "room": 501, "__return__": ["REF", 2]}, "is_highlighted": false, "is_parent": true, "func_name": "Staff601", "is_zombie": true, "parent_frame_id_list": [], "unique_hash": "Staff601_f1_p_z", "ordered_varnames": ["building", "course", "room", "salutation", "__return__"]}], "globals": {"Staff601": ["REF", 3], "pat": ["REF", 4]}, "heap": {"1": ["FUNCTION", "salutation(self)", 1], "2": ["DICT", ["building", 34], ["room", 501], ["course", "6.01"], ["salutation", ["REF", 1]], ["__doc__", null]], "3": ["CLASS", "Staff601", [], ["building", 34], ["course", "6.01"], ["room", 501], ["salutation", ["REF", 1]]], "4": ["INSTANCE", "Staff601"]}, "line": 14, "event": "step_line"}, {"ordered_globals": ["Staff601", "pat"], "stdout": "6.01\n", "func_name": "", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01", "salutation": ["REF", 1], "room": 501, "__return__": ["REF", 2]}, "is_highlighted": false, "is_parent": true, "func_name": "Staff601", "is_zombie": true, "parent_frame_id_list": [], "unique_hash": "Staff601_f1_p_z", "ordered_varnames": ["building", "course", "room", "salutation", "__return__"]}], "globals": {"Staff601": ["REF", 3], "pat": ["REF", 4]}, "heap": {"1": ["FUNCTION", "salutation(self)", 1], "2": ["DICT", ["building", 34], ["room", 501], ["course", "6.01"], ["salutation", ["REF", 1]], ["__doc__", null]], "3": ["CLASS", "Staff601", [], ["building", 34], ["course", "6.01"], ["room", 501], ["salutation", ["REF", 1]]], "4": ["INSTANCE", "Staff601"]}, "line": 16, "event": "step_line"}, {"ordered_globals": ["Staff601", "pat"], "stdout": "6.01\n", "func_name": "", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01", "salutation": ["REF", 1], "room": 501, "__return__": ["REF", 2]}, "is_highlighted": false, "is_parent": true, "func_name": "Staff601", "is_zombie": true, "parent_frame_id_list": [], "unique_hash": "Staff601_f1_p_z", "ordered_varnames": ["building", "course", "room", "salutation", "__return__"]}], "globals": {"Staff601": ["REF", 3], "pat": ["REF", 4]}, "heap": {"1": ["FUNCTION", "salutation(self)", 1], "2": ["DICT", ["building", 34], ["room", 501], ["course", "6.01"], ["salutation", ["REF", 1]], ["__doc__", null]], "3": ["CLASS", "Staff601", [], ["building", 34], ["course", "6.01"], ["room", 501], ["salutation", ["REF", 1]]], "4": ["INSTANCE", "Staff601", ["name", "Pat"]]}, "line": 17, "event": "step_line"}, {"ordered_globals": ["Staff601", "pat"], "stdout": "6.01\n", "func_name": "", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01", "salutation": ["REF", 1], "room": 501, "__return__": ["REF", 2]}, "is_highlighted": false, "is_parent": true, "func_name": "Staff601", "is_zombie": true, "parent_frame_id_list": [], "unique_hash": "Staff601_f1_p_z", "ordered_varnames": ["building", "course", "room", "salutation", "__return__"]}], "globals": {"Staff601": ["REF", 3], "pat": ["REF", 4]}, "heap": {"1": ["FUNCTION", "salutation(self)", 1], "2": ["DICT", ["building", 34], ["room", 501], ["course", "6.01"], ["salutation", ["REF", 1]], ["__doc__", null]], "3": ["CLASS", "Staff601", [], ["building", 34], ["course", "6.01"], ["room", 501], ["salutation", ["REF", 1]]], "4": ["INSTANCE", "Staff601", ["age", 60], ["name", "Pat"]]}, "line": 18, "event": "step_line"}, {"ordered_globals": ["Staff601", "pat"], "stdout": "6.01\n", "func_name": "", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01", "salutation": ["REF", 1], "room": 501, "__return__": ["REF", 2]}, "is_highlighted": false, "is_parent": true, "func_name": "Staff601", "is_zombie": true, "parent_frame_id_list": [], "unique_hash": "Staff601_f1_p_z", "ordered_varnames": ["building", "course", "room", "salutation", "__return__"]}], "globals": {"Staff601": ["REF", 3], "pat": ["REF", 4]}, "heap": {"1": ["FUNCTION", "salutation(self)", 1], "2": ["DICT", ["building", 34], ["room", 501], ["course", "6.01"], ["salutation", ["REF", 1]], ["__doc__", null]], "3": ["CLASS", "Staff601", [], ["building", 34], ["course", "6.01"], ["room", 501], ["salutation", ["REF", 1]]], "4": ["INSTANCE", "Staff601", ["age", 60], ["name", "Pat"], ["role", "Professor"]]}, "line": 20, "event": "step_line"}, {"ordered_globals": ["Staff601", "pat"], "stdout": "6.01\n34\n", "func_name": "", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01", "salutation": ["REF", 1], "room": 501, "__return__": ["REF", 2]}, "is_highlighted": false, "is_parent": true, "func_name": "Staff601", "is_zombie": true, "parent_frame_id_list": [], "unique_hash": "Staff601_f1_p_z", "ordered_varnames": ["building", "course", "room", "salutation", "__return__"]}], "globals": {"Staff601": ["REF", 3], "pat": ["REF", 4]}, "heap": {"1": ["FUNCTION", "salutation(self)", 1], "2": ["DICT", ["building", 34], ["room", 501], ["course", "6.01"], ["salutation", ["REF", 1]], ["__doc__", null]], "3": ["CLASS", "Staff601", [], ["building", 34], ["course", "6.01"], ["room", 501], ["salutation", ["REF", 1]]], "4": ["INSTANCE", "Staff601", ["age", 60], ["name", "Pat"], ["role", "Professor"]]}, "line": 21, "event": "step_line"}, {"ordered_globals": ["Staff601", "pat"], "stdout": "6.01\n34\n", "func_name": "", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01", 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false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 4]}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "bar_i1", "func_name": "bar", "is_zombie": false, "ordered_varnames": ["myLst"], "frame_id": null, "encoded_locals": {"myLst": ["REF", 4]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 3], "foo": ["REF", 5], "bar": ["REF", 6], "z": ["REF", 4]}, "heap": {"3": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "4": ["LIST", 1, 2, 3, 4, 5, "hello"], "5": ["FUNCTION", "foo(lst)", null], "6": ["FUNCTION", "bar(myLst)", null]}, "line": 21, "event": "call"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n", "func_name": "bar", "stack_to_render": [{"unique_hash": "foo_i0", "func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 4]}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "bar_i1", "func_name": "bar", "is_zombie": false, "ordered_varnames": ["myLst"], "frame_id": null, "encoded_locals": {"myLst": ["REF", 4]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 3], "foo": ["REF", 5], "bar": ["REF", 6], "z": ["REF", 4]}, "heap": {"3": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "4": ["LIST", 1, 2, 3, 4, 5, "hello"], "5": ["FUNCTION", "foo(lst)", null], "6": ["FUNCTION", "bar(myLst)", null]}, "line": 22, "event": "step_line"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n[1, 2, 3, 4, 5, 'hello']\n", "func_name": "bar", "stack_to_render": [{"unique_hash": "foo_i0", "func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst"], "frame_id": null, "encoded_locals": {"lst": ["REF", 4]}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "bar_i1", "func_name": "bar", "is_zombie": false, "ordered_varnames": ["myLst", "__return__"], "frame_id": null, "encoded_locals": {"__return__": null, "myLst": ["REF", 4]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 3], "foo": ["REF", 5], "bar": ["REF", 6], "z": ["REF", 4]}, "heap": {"3": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "4": ["LIST", 1, 2, 3, 4, 5, "hello"], "5": ["FUNCTION", "foo(lst)", null], "6": ["FUNCTION", "bar(myLst)", null]}, "line": 22, "event": "return"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n[1, 2, 3, 4, 5, 'hello']\n", "func_name": "foo", "stack_to_render": [{"unique_hash": "foo_i0", "func_name": "foo", "is_zombie": false, "ordered_varnames": ["lst", "__return__"], "frame_id": null, "encoded_locals": {"__return__": null, "lst": ["REF", 4]}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"y": "hello", "x": ["REF", 3], "foo": ["REF", 5], "bar": ["REF", 6], "z": ["REF", 4]}, "heap": {"3": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "4": ["LIST", 1, 2, 3, 4, 5, "hello"], "5": ["FUNCTION", "foo(lst)", null], "6": ["FUNCTION", "bar(myLst)", null]}, "line": 19, "event": "return"}, {"ordered_globals": ["x", "y", "z", "foo", "bar"], "stdout": "[1, 2, 3, 4, 5, 6, 7, 'hello']\n[1, 2, 3, 4, 5, 'hello']\n", "func_name": "", "stack_to_render": [], "globals": {"y": "hello", "x": ["REF", 3], "z": ["REF", 4], "bar": ["REF", 6], "foo": ["REF", 5]}, "heap": {"3": ["LIST", 1, 2, 3, 4, 5, 6, 7, "hello"], "4": ["LIST", 1, 2, 3, 4, 5, "hello"], "5": ["FUNCTION", "foo(lst)", null], "6": ["FUNCTION", "bar(myLst)", null]}, "line": 25, "event": "return"}]};

From 3d9b35df0ba8893c2efef414c1c06fd12e04cd1a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 19 Aug 2012 17:25:47 -0700
Subject: [PATCH 131/502] aaoga2

---
 PyTutorGAE/css/pytutor.css | 62 +++++++++++++++-----------------------
 1 file changed, 25 insertions(+), 37 deletions(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index b36b71b2e..3d74cc86a 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -328,19 +328,21 @@ table.dictTbl {
 
 
 table.dictTbl td.dictKey,
-table.instTbl td.instKey {
+table.instTbl td.instKey,
+table.classTbl td.classKey {
   background-color: #faebbf /*#fde9bb*/ /*#fce1a2*/ /*#ffff78*/ /*#ffffc6*/;
 }
 
 table.dictTbl td.dictVal,
-table.instTbl td.instVal {
+table.instTbl td.instVal,
+table.classTbl td.classVal {
   background-color: #ffffc6;
 }
 
 
 table.dictTbl td.dictKey,
-table.classTbl td.classKey,
-table.instTbl td.instKey {
+table.instTbl td.instKey,
+table.classTbl td.classKey {
   padding-top: 8px;
   padding-bottom: 8px;
   padding-left: 8px;
@@ -350,54 +352,40 @@ table.instTbl td.instKey {
   vertical-align: center;
 }
 
-table.classTbl td.classKey {
-  color: #dddddd;
-}
-
-table.classTbl {
-  background-color: #dddddd;
-  border-collapse: collapse;
-  border-spacing: 1px;
+table.dictTbl td.dictVal,
+table.instTbl td.instVal,
+table.classTbl td.classVal {
+  padding-top: 10px;
+  padding-bottom: 10px;
+  padding-right: 10px;
+  padding-left: 8px;
+  vertical-align: center;
 }
 
-table.classTbl tr.classEntry {
-  border: 1px #777777 solid;
-}
 
-table.classTbl td.classKey {
-  background-color: #222222;
+table.classTbl td,
+table.instTbl td {
+  border-bottom: 1px #888 solid;
 }
 
-table.classTbl td.classVal {
-  background-color: #ffffff;
+table.classTbl td.classVal,
+table.instTbl td.instVal {
+  border-left: 1px #888 solid;
 }
 
-
+table.classTbl,
 table.instTbl {
-  border-collapse: collapse;
   border-spacing: 1px;
-  border: 1px #555555 solid;
-}
-
-table.dictTbl tr.dictEntry,
-table.instTbl tr.instEntry {
+  /*border-collapse: collapse;*/
   /*border: 1px #555555 solid;*/
 }
 
-
-table.dictTbl td.dictVal,
-table.classTbl td.classVal,
-table.instTbl td.instVal {
-  padding-top: 10px;
-  padding-bottom: 10px;
-  padding-right: 10px;
-  padding-left: 8px;
-  vertical-align: center;
+table.classTbl {
+  border-collapse: collapse;
+  border: 1px #888 solid;
 }
 
 
-
-
 .typeLabel {
   font-size: 8pt;
   color: #222222;

From c0fe140676611736a45b14eb130420eafbb24581 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 19 Aug 2012 17:31:00 -0700
Subject: [PATCH 132/502] bah

---
 PyTutorGAE/css/pytutor.css | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index 3d74cc86a..8217905a8 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -343,10 +343,10 @@ table.classTbl td.classVal {
 table.dictTbl td.dictKey,
 table.instTbl td.instKey,
 table.classTbl td.classKey {
-  padding-top: 8px;
-  padding-bottom: 8px;
-  padding-left: 8px;
-  padding-right: 8px;
+  padding-top: 15px;
+  padding-bottom: 5px;
+  padding-left: 12px;
+  padding-right: 4px;
 
   text-align: right;
   vertical-align: center;
@@ -355,14 +355,14 @@ table.classTbl td.classKey {
 table.dictTbl td.dictVal,
 table.instTbl td.instVal,
 table.classTbl td.classVal {
-  padding-top: 10px;
-  padding-bottom: 10px;
-  padding-right: 10px;
-  padding-left: 8px;
+  padding-top: 15px;
+  padding-bottom: 5px;
+  padding-right: 12px;
+  padding-left: 4px;
+
   vertical-align: center;
 }
 
-
 table.classTbl td,
 table.instTbl td {
   border-bottom: 1px #888 solid;

From de9dbcdfa1172f8be8b545dbf6a3b47fc3d2d04d Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 19 Aug 2012 17:34:34 -0700
Subject: [PATCH 133/502] final touches on color cleanup

---
 PyTutorGAE/css/pytutor.css | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index 8217905a8..99ce26059 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -206,7 +206,6 @@ button.medBtn {
 /* Python data value rendering */
 
 .nullObj {
-  color: #555555;
   font-size: 9pt;
 }
 
@@ -229,12 +228,10 @@ button.medBtn {
 
 .customObj {
   font-family: Andale mono, monospace;
-  /*font-style: italic;*/
 }
 
 .funcObj {
   font-family: Andale mono, monospace;
-  /*font-style: italic;*/
 }
 
 .retval,
@@ -243,12 +240,6 @@ button.medBtn {
   /*color: #9d1e18;*/
 }
 
-.returnWarning {
-  padding-top: 10px;
-  /*color: #9d1e18;*/
-}
-
-
 table.listTbl {
   border: 0px solid black;
   border-spacing: 0px;

From 9a5c47e56d850806ee79cb2bc440248829cf735b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 19 Aug 2012 18:26:03 -0700
Subject: [PATCH 134/502] minor

---
 PyTutorGAE/embedding-examples.js | 2 +-
 PyTutorGAE/embedding-test.html   | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/PyTutorGAE/embedding-examples.js b/PyTutorGAE/embedding-examples.js
index 6e1053553..d03022cd8 100644
--- a/PyTutorGAE/embedding-examples.js
+++ b/PyTutorGAE/embedding-examples.js
@@ -17,7 +17,7 @@ var aliasing5Viz = null;
 var hanoiViz = null;
 
 $(document).ready(function() {
-  stuffViz = new ExecutionVisualizer('closure4Div', stuff, {hideOutput: true, jumpToEnd: true, editCodeBaseURL: 'http://localhost:8080/'});
+  stuffViz = new ExecutionVisualizer('stuffDiv', stuff, {hideOutput: true, jumpToEnd: true, editCodeBaseURL: 'http://localhost:8080/'});
   aliasing5Viz = new ExecutionVisualizer('aliasing5Div', aliasing5, {hideOutput: true, jumpToEnd: true, editCodeBaseURL: 'http://localhost:8080/'});
   hanoiViz = new ExecutionVisualizer('hanoiDiv', hanoi, {startingInstruction: 45, hideOutput: true, editCodeBaseURL: 'http://localhost:8080/'});
 
diff --git a/PyTutorGAE/embedding-test.html b/PyTutorGAE/embedding-test.html
index 769e628b4..f6fbd56d8 100644
--- a/PyTutorGAE/embedding-test.html
+++ b/PyTutorGAE/embedding-test.html
@@ -23,9 +23,9 @@
 
 
 
-
Closures:

+
Stuff:

 
-

+

 
 
Aliasing 5:

 

From ba78a06d3a975b191a4cbbc3908997d4f2418c6e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 19 Aug 2012 18:47:30 -0700
Subject: [PATCH 135/502] css cleanup

---
 PyTutorGAE/css/pytutor.css | 112 ++++++++-----------------------------
 1 file changed, 22 insertions(+), 90 deletions(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index 99ce26059..6dc8a1a50 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -26,43 +26,7 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 */
 
-/*
-Color scheme ideas: 
-
-Current scheme: pastel blue and yellow with a hint of red:
-  http://colorschemedesigner.com/#3N32mmmuew0w0
-
-Primary Color:
-  3D58A2    41507A    142B69    6F89D1    899CD1
-Secondary Color A:
-  EBF048    B1B456    989C17    F4F776    F5F798
-Secondary Color B:
-  F15149    B55B56    9D1E18    F87D76    F89D99
-
-
-Alternates:
-
-pastel green, yellow, and purple:
-  http://colorschemedesigner.com/#2P32PbX--w0w0
-
-  Primary Color:
-    A0FFA0    8ABF8A    34A634    B8FFB8    CBFFCB
-  Secondary Color A:
-    FFEFA0    BFB68A    A69234    FFF3B8    FFF6CB
-  Secondary Color B:
-    BFABFF    9B90BF    5237A6    CFC0FF    DCD1FF
-
-
-pastel blue and yellow:
-  http://colorschemedesigner.com/#0W21TjruJw0w0
-
-Primary Color:
-  F5C260    B89B64    9F741F    FAD388    FADEA6
-Complementary Color:
-  4A67A4    49597B    18326A    7C97D1    93A7D1
-
-
-*/
+/* Most recent color scheme redesign: 2012-08-19 */
 
 table.visualizer {
   font-family: verdana, arial, helvetica, sans-serif;
@@ -203,12 +167,13 @@ button.medBtn {
 }
 
 
-/* Python data value rendering */
+/* Rendering of primitive types */
 
 .nullObj {
-  font-size: 9pt;
+  font-size: 8pt;
 }
 
+/*
 .numberObj {
   font-size: 10pt;
 }
@@ -216,36 +181,29 @@ button.medBtn {
 .boolObj {
   font-size: 10pt;
 }
+*/
 
-.stringObj {
-  /* don't add a color since strings need to be rendered against various backgrounds */
+.stringObj, .customObj, .funcObj {
   font-family: Andale mono, monospace;
-  font-size: 10pt;
 }
 
-.keyObj {
+.retval {
+  font-size: 9pt;
 }
 
-.customObj {
-  font-family: Andale mono, monospace;
-}
 
-.funcObj {
-  font-family: Andale mono, monospace;
-}
+/* Rendering of basic compound types */
 
-.retval,
-.returnWarning {
-  font-size: 9pt;
-  /*color: #9d1e18;*/
+table.listTbl, table.tupleTbl, table.setTbl {
+  background-color: #ffffc6;
 }
 
+
 table.listTbl {
   border: 0px solid black;
   border-spacing: 0px;
 }
 
-
 table.listTbl td.listHeader,
 table.tupleTbl td.tupleHeader {
   padding-left: 5px;
@@ -266,11 +224,6 @@ table.tupleTbl {
 }
 
 
-table.listTbl, table.tupleTbl, table.setTbl {
-  background-color: #ffffc6 /*#fcf08f*/ /*#f7fab9*/;
-}
-
-
 table.listTbl td.listElt {
   border-bottom: 1px solid #555555; /* must match td.listHeader border */
   border-left: 1px solid #555555; /* must match td.listHeader border */
@@ -301,7 +254,6 @@ table.tupleTbl td.tupleElt {
 
 table.setTbl {
   border: 1px solid #555555;
-  /*background-color: #F5F798;*/
   border-spacing: 0px;
   text-align: center;
 }
@@ -311,17 +263,17 @@ table.setTbl td.setElt {
 }
 
 
-table.dictTbl {
-  /*border: 1px solid #555555;*/
-  /*border-collapse: collapse;*/
+table.dictTbl,
+table.instTbl,
+table.classTbl {
   border-spacing: 1px;
+  /*border-collapse: collapse;*/
 }
 
-
 table.dictTbl td.dictKey,
 table.instTbl td.instKey,
 table.classTbl td.classKey {
-  background-color: #faebbf /*#fde9bb*/ /*#fce1a2*/ /*#ffff78*/ /*#ffffc6*/;
+  background-color: #faebbf;
 }
 
 table.dictTbl td.dictVal,
@@ -354,6 +306,7 @@ table.classTbl td.classVal {
   vertical-align: center;
 }
 
+
 table.classTbl td,
 table.instTbl td {
   border-bottom: 1px #888 solid;
@@ -364,13 +317,6 @@ table.instTbl td.instVal {
   border-left: 1px #888 solid;
 }
 
-table.classTbl,
-table.instTbl {
-  border-spacing: 1px;
-  /*border-collapse: collapse;*/
-  /*border: 1px #555555 solid;*/
-}
-
 table.classTbl {
   border-collapse: collapse;
   border: 1px #888 solid;
@@ -383,15 +329,6 @@ table.classTbl {
   margin-bottom: 1px;
 }
 
-td.dictKey .typeLabel {
-  color: #eeeeee;
-}
-
-.aliasLabel {
-  font-size: 10pt;
-  color: #222222;
-}
-
 #footer {
   color: #666666;
   font-size: 9pt;
@@ -425,23 +362,19 @@ div.stackFrame, div.zombieStackFrame {
   padding-right: 6px;
   padding-bottom: 4px;
   font-size: 10pt;
-  /*border-left: 2px solid #666666;*/
 }
 
 div.zombieStackFrame {
-  border-left: 1px dotted #aaa; /* make zombie borders thinner */
-  color: #c0c0c0 /*#aaa*/;
+  border-left: 1px dotted #aaa;
+  color: #c0c0c0;
 }
 
 div.highlightedStackFrame {
-  background-color: #c5dfea /*#a8d0df*/ /*#c1ebf7*/   /*#8bc0d5*/ /*#afd1d7*/ /*#95c2ca*/ /*#aae4f4*/ /*#c4e9ef*/ /*#c1c7e5*/ /*#afcede*/ /*#9dc3d6*/ /*#b8f0ff - BAD*/ /*#e4faeb*/ /*#b0e1e9*/ /*#6b83c1*/ /*#8cd7d1*/ /*#4ac0b6*/ /*#b0e1e9*/ /*#3e8dad*/ /*#dddddd*/;
-  /*border-left: 2px solid #F15149;*/
+  background-color: #c5dfea;
 }
 
-
-
 div.stackFrame, div.highlightedStackFrame {
-  border-left: 2px solid #a6b3b6 /*#8a9b9f*/ /*#98a7ab*/ /*#d0d7d8*/ /*#7c8f94*/;
+  border-left: 2px solid #a6b3b6;
 }
 
 
@@ -611,7 +544,6 @@ div#submittedSolutionDisplay {
 
 
 #executionSlider {
-  /*width: 900px;*/
   width: 500px;
   margin-top: 10px;
   margin-bottom: 5px;

From e77cab53642002fcf58569173cc06d1d51360433 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 19 Aug 2012 19:00:21 -0700
Subject: [PATCH 136/502] js color cleanups

---
 PyTutorGAE/js/pytutor.js | 49 +++++-----------------------------------
 1 file changed, 6 insertions(+), 43 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 918393604..331557cdb 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1894,61 +1894,24 @@ ExecutionVisualizer.prototype.redrawConnectors = function() {
 // Utilities
 
 
+/* colors - see pytutor.css for more colors */
 
-
-/* colors - see pytutor.css */
-var lightYellow = '#F5F798';
-
-//var highlightedLineColor = '#FFFFCC';
-//var highlightedLineColor = '#88e777';
-//var highlightedLineColor = '#9beb8d';
-//var highlightedLineColor = '#aeefa2';
-//var highlightedLineColor = '#c1f2b8';
-//var highlightedLineColor = '#c1f2b8';
-//var highlightedLineColor = '#d0d7d8';
-//var highlightedLineColor = '#b8f2cc';
-//var highlightedLineColor = '#e3faeb';
 var highlightedLineColor = '#cef6db';
-
-
-//var highlightedLineTopBorderColor = '#3b5998';
 var highlightedLineTopBorderColor = '#005583';
 
-//var visitedLineColor = '#3D58A2';
 var visitedLineColor = highlightedLineTopBorderColor;
 
-var errorColor = '#F87D76';
-
-//var terminatedLineColor = "#899CD1";
-//var terminatedLineColor = '#3e8dad';
-//var terminatedLineColor = '#4ac0b6';
-//var terminatedLineColor = '#77e69e';
-//var terminatedLineColor = '#8deaad';
 var terminatedLineColor = '#a2eebd';
 
-var darkBlue = "#3D58A2";
-var medBlue = "#41507A";
-var medLightBlue = "#6F89D1";
-var pinkish = "#F15149";
-var lightPink = "#F89D99";
-var darkRed = "#9D1E18";
-
-//var connectorBaseColor = darkBlue;
-//var connectorBaseColor = "#005583";
-//var connectorBaseColor = "#425c9d";
-//var connectorBaseColor = "#3b5998";
-var connectorBaseColor = '#005583';
-
-//var connectorHighlightColor = pinkish;
-var connectorHighlightColor = '#d03939';
+var darkRed = '#d03939';
 
+var connectorBaseColor = '#005583';
+var connectorHighlightColor = darkRed;
 var connectorInactiveColor = '#cccccc';
-//var connectorInactiveColor = '#ecf2f5';
 
-//var breakpointColor = pinkish;
-var breakpointColor = connectorHighlightColor;
+var errorColor = darkRed;
 
-//var hoverBreakpointColor = medLightBlue;
+var breakpointColor = darkRed;
 var hoverBreakpointColor = connectorBaseColor;
 
 

From 37bac28a5d42a1a040fd477945dcbb6189c48be1 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 19 Aug 2012 19:21:28 -0700
Subject: [PATCH 137/502] small tweak to hover breakpoint displays

---
 PyTutorGAE/js/pytutor.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 331557cdb..d4fcc513b 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -543,7 +543,10 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
 
     myViz.hoverBreakpoints = d3.map();
     $.each(exePts, function(i, ep) {
-      myViz.hoverBreakpoints.set(ep, 1);
+      // don't add redundant entries
+      if (!myViz.breakpoints.has(ep)) {
+        myViz.hoverBreakpoints.set(ep, 1);
+      }
     });
 
     addToBreakpoints(exePts);
@@ -562,6 +565,11 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
 
     addToBreakpoints(exePts);
 
+    // remove from hoverBreakpoints so that slider display immediately changes color
+    $.each(exePts, function(i, ep) {
+      myViz.hoverBreakpoints.remove(ep);
+    });
+
     d3.select(t.parentNode).select('td.lineNo').style('color', breakpointColor);
     d3.select(t.parentNode).select('td.lineNo').style('font-weight', 'bold');
 

From c6ac9d09e7d9453535c8edd54bdfe663693690e1 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 19 Aug 2012 19:26:00 -0700
Subject: [PATCH 138/502] tiny color change

---
 PyTutorGAE/css/pytutor.css | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index 6dc8a1a50..15ee01d7a 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -366,7 +366,8 @@ div.stackFrame, div.zombieStackFrame {
 
 div.zombieStackFrame {
   border-left: 1px dotted #aaa;
-  color: #c0c0c0;
+  /*color: #c0c0c0;*/
+  color: #b0b0b0;
 }
 
 div.highlightedStackFrame {

From c2dc5245d811482ab53976b02bdc79cb5af03290 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 19 Aug 2012 21:56:27 -0700
Subject: [PATCH 139/502] more minor css adjustments

---
 PyTutorGAE/css/pytutor.css | 4 ++--
 PyTutorGAE/js/pytutor.js   | 3 ++-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index 15ee01d7a..d1f1ff459 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -288,7 +288,7 @@ table.instTbl td.instKey,
 table.classTbl td.classKey {
   padding-top: 15px;
   padding-bottom: 5px;
-  padding-left: 12px;
+  padding-left: 10px;
   padding-right: 4px;
 
   text-align: right;
@@ -300,7 +300,7 @@ table.instTbl td.instVal,
 table.classTbl td.classVal {
   padding-top: 15px;
   padding-bottom: 5px;
-  padding-right: 12px;
+  padding-right: 10px;
   padding-left: 4px;
 
   vertical-align: center;
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index d4fcc513b..0385fc3a1 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1552,6 +1552,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       myViz.jsPlumbInstance.select().each(function(c) {
         if (c.targetId == foundTargetId) {
           c.setHover(true);
+          $(c.canvas).css("z-index", 2000); // ... and move it to the VERY FRONT
         }
         else {
           c.setHover(false);
@@ -1904,7 +1905,7 @@ ExecutionVisualizer.prototype.redrawConnectors = function() {
 
 /* colors - see pytutor.css for more colors */
 
-var highlightedLineColor = '#cef6db';
+var highlightedLineColor = '#e4faeb';
 var highlightedLineTopBorderColor = '#005583';
 
 var visitedLineColor = highlightedLineTopBorderColor;

From bcc5d12a0b718732f3ae9b819bccdb3f8fcdb7a1 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 19 Aug 2012 22:17:02 -0700
Subject: [PATCH 140/502] more css tweaks

---
 PyTutorGAE/css/pytutor.css | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index d1f1ff459..e5bfe4ccb 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -206,10 +206,11 @@ table.listTbl {
 
 table.listTbl td.listHeader,
 table.tupleTbl td.tupleHeader {
-  padding-left: 5px;
-  padding-top: 3px;
+  padding-left: 4px;
+  padding-top: 2px;
+  padding-bottom: 3px;
   font-size: 8pt;
-  color: #666666;
+  color: #777;
   text-align: left;
   border-left: 1px solid #555555;
 }
@@ -267,7 +268,6 @@ table.dictTbl,
 table.instTbl,
 table.classTbl {
   border-spacing: 1px;
-  /*border-collapse: collapse;*/
 }
 
 table.dictTbl td.dictKey,
@@ -286,24 +286,21 @@ table.classTbl td.classVal {
 table.dictTbl td.dictKey,
 table.instTbl td.instKey,
 table.classTbl td.classKey {
-  padding-top: 15px;
+  padding-top: 12px /*15px*/;
   padding-bottom: 5px;
   padding-left: 10px;
   padding-right: 4px;
 
   text-align: right;
-  vertical-align: center;
 }
 
 table.dictTbl td.dictVal,
 table.instTbl td.instVal,
 table.classTbl td.classVal {
-  padding-top: 15px;
+  padding-top: 12px /*15px*/;
   padding-bottom: 5px;
   padding-right: 10px;
   padding-left: 4px;
-
-  vertical-align: center;
 }
 
 
@@ -322,6 +319,15 @@ table.classTbl {
   border: 1px #888 solid;
 }
 
+/* only add a border to dicts if they're embedded within another object */
+td.listElt table.dictTbl,
+td.tupleElt table.dictTbl,
+td.dictVal table.dictTbl,
+td.instVal table.dictTbl,
+td.classVal table.dictTbl {
+  border: 1px #888 solid;
+}
+
 
 .typeLabel {
   font-size: 8pt;

From 124543b86ec65e3c950fec89f4acc3c8ac7674e0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 20 Aug 2012 16:31:12 -0700
Subject: [PATCH 141/502] added example-code/sum-cubes.txt test and made it
 pass

---
 PyTutorGAE/js/opt-frontend.js |  5 +++++
 PyTutorGAE/pg_logger.py       | 12 +++++++++++-
 PyTutorGAE/tutor.html         |  3 ++-
 example-code/sum-cubes.txt    | 16 ++++++++++++++++
 4 files changed, 34 insertions(+), 2 deletions(-)
 create mode 100644 example-code/sum-cubes.txt

diff --git a/PyTutorGAE/js/opt-frontend.js b/PyTutorGAE/js/opt-frontend.js
index 4f4abec76..446ea0fe7 100644
--- a/PyTutorGAE/js/opt-frontend.js
+++ b/PyTutorGAE/js/opt-frontend.js
@@ -297,6 +297,11 @@ $(document).ready(function() {
     return false;
   });
 
+  $("#sumCubesLink").click(function() {
+    $.get("example-code/sum-cubes.txt", setCodeMirrorVal);
+    return false;
+  });
+
 
   $('#closure1Link').click(function() {
     $.get("example-code/closures/closure1.txt", setCodeMirrorVal);
diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index a5354895b..158ca0cac 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -103,6 +103,9 @@ def __init__(self, cumulative_mode, finalizer_func):
         # Value: parent frame
         self.closures = {}
 
+        # set of function objects that were defined in the global scope
+        self.globally_defined_funcs = set()
+
         # Key: frame object
         # Value: monotonically increasing small ID, based on call order
         self.frame_ordered_ids = {}
@@ -372,11 +375,18 @@ def create_encoded_stack_entry(cur_frame):
         if i > 1: # i == 1 implies that there's only a global scope visible
           for (k, v) in get_user_locals(top_frame).items():
             if (type(v) in (types.FunctionType, types.MethodType) and \
-                v not in self.closures):
+                v not in self.closures and \
+                v not in self.globally_defined_funcs):
               self.closures[v] = top_frame
               self.parent_frames_set.add(top_frame) # unequivocally add to this set!!!
               if not top_frame in self.zombie_frames:
                 self.zombie_frames.append(top_frame)
+        else:
+          # if there is only a global scope visible ...
+          for (k, v) in get_user_globals(top_frame).items():
+            if (type(v) in (types.FunctionType, types.MethodType) and \
+                v not in self.closures):
+              self.globally_defined_funcs.add(v)
 
 
         # climb up until you find '', which is (hopefully) the global scope
diff --git a/PyTutorGAE/tutor.html b/PyTutorGAE/tutor.html
index 29f6bcf05..db3174b6c 100644
--- a/PyTutorGAE/tutor.html
+++ b/PyTutorGAE/tutor.html
@@ -88,7 +88,8 @@
 gcd |
 sumList |
 towers of hanoi |
-exceptions
+exceptions |
+sum cubes
 
 

 
diff --git a/example-code/sum-cubes.txt b/example-code/sum-cubes.txt
new file mode 100644
index 000000000..7eff416f7
--- /dev/null
+++ b/example-code/sum-cubes.txt
@@ -0,0 +1,16 @@
+def summation(n, term, next):
+  total, k = 0, 1
+  while k <= n:
+    total, k = total + term(k), next(k)
+    return total
+
+def cube(k):
+  return pow(k, 3)
+
+def successor(k):
+  return k + 1
+
+def sum_cubes(n):
+  return summation(n, cube, successor)
+
+sum_cubes(3)

From ccc2bf45f66903052364647efce5889c4c9ba537 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 20 Aug 2012 19:05:03 -0700
Subject: [PATCH 142/502] increase line height so that underscores render
 properly

---
 PyTutorGAE/css/codemirror.css | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/PyTutorGAE/css/codemirror.css b/PyTutorGAE/css/codemirror.css
index fb5b6d544..b8dda7541 100644
--- a/PyTutorGAE/css/codemirror.css
+++ b/PyTutorGAE/css/codemirror.css
@@ -1,5 +1,5 @@
 .CodeMirror {
-  line-height: 1em;
+  line-height: 1.2em; /* pgbovine - enables underscore (_) characters to render properly */
   font-family: monospace;
 
   /* Necessary so the scrollbar can be absolutely positioned within the wrapper on Lion. */

From 3b020ff309d69786c717ecb5ec7e952665bcb6b0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 21 Aug 2012 11:33:56 -0700
Subject: [PATCH 143/502] FINALLY start setting up some regression tests

---
 PyTutorGAE/generate_json_trace.py             |   8 +-
 PyTutorGAE/js/opt-frontend.js                 |   4 +
 PyTutorGAE/pg_logger.py                       |  32 ++++
 .../backend-tests/caught_exception_1.txt      |   5 +
 .../backend-tests/caught_exception_2.txt      |  12 ++
 PyTutorGAE/tests/backend-tests/circ_ref.txt   |   5 +
 PyTutorGAE/tests/backend-tests/circ_ref_2.txt |   6 +
 .../tests/backend-tests/circ_ref_fake.txt     |   7 +
 PyTutorGAE/tests/backend-tests/class_test.txt |  13 ++
 .../tests/backend-tests/class_test_2.txt      |   8 +
 .../tests/backend-tests/class_test_3.txt      |  16 ++
 PyTutorGAE/tests/backend-tests/data_test.txt  |   4 +
 PyTutorGAE/tests/backend-tests/dict_error.txt |   4 +
 PyTutorGAE/tests/backend-tests/dict_test.txt  |  10 ++
 PyTutorGAE/tests/backend-tests/exec_test.txt  |   1 +
 .../tests/backend-tests/func_exception.txt    |   7 +
 .../tests/backend-tests/generator_test.txt    |   3 +
 .../tests/backend-tests/import_error.txt      |   4 +
 .../tests/backend-tests/infinite_loop.txt     |  12 ++
 .../backend-tests/infinite_loop_one_liner.txt |   1 +
 PyTutorGAE/tests/backend-tests/lambda_1.txt   |  12 ++
 .../tests/backend-tests/list_dict_test.txt    |   6 +
 PyTutorGAE/tests/backend-tests/list_test.txt  |   1 +
 .../tests/backend-tests/newstyle_class.txt    |  15 ++
 PyTutorGAE/tests/backend-tests/one_func.txt   |   8 +
 PyTutorGAE/tests/backend-tests/open_error.txt |   3 +
 .../tests/backend-tests/parse_error.txt       |   6 +
 .../tests/backend-tests/parse_error_2.txt     |   5 +
 .../tests/backend-tests/parse_error_3.txt     |   6 +
 .../backend-tests/print_builtins_error.txt    |   1 +
 .../tests/backend-tests/runtime_error.txt     |   8 +
 PyTutorGAE/tests/backend-tests/set_test.txt   |   7 +
 PyTutorGAE/tests/backend-tests/simple.txt     |   7 +
 .../tests/backend-tests/three_lists.txt       |  13 ++
 PyTutorGAE/tests/backend-tests/tuple_test.txt |   3 +
 PyTutorGAE/tests/backend-tests/two_funcs.txt  |  14 ++
 PyTutorGAE/tests/golden_test.py               | 166 ++++++++++++++++++
 PyTutorGAE/tutor.html                         |   3 +-
 example-code/closures/lambda-param.txt        |   7 +
 39 files changed, 451 insertions(+), 2 deletions(-)
 create mode 100644 PyTutorGAE/tests/backend-tests/caught_exception_1.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/caught_exception_2.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/circ_ref.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/circ_ref_2.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/circ_ref_fake.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/class_test.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/class_test_2.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/class_test_3.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/data_test.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/dict_error.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/dict_test.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/exec_test.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/func_exception.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/generator_test.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/import_error.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/infinite_loop.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/infinite_loop_one_liner.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/lambda_1.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/list_dict_test.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/list_test.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/newstyle_class.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/one_func.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/open_error.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/parse_error.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/parse_error_2.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/parse_error_3.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/print_builtins_error.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/runtime_error.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/set_test.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/simple.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/three_lists.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/tuple_test.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/two_funcs.txt
 create mode 100644 PyTutorGAE/tests/golden_test.py
 create mode 100644 example-code/closures/lambda-param.txt

diff --git a/PyTutorGAE/generate_json_trace.py b/PyTutorGAE/generate_json_trace.py
index e0799d437..ab00b91f1 100644
--- a/PyTutorGAE/generate_json_trace.py
+++ b/PyTutorGAE/generate_json_trace.py
@@ -2,13 +2,19 @@
 
 CUMULATIVE_MODE = False
 
+COMPACT = False
+if COMPACT:
+  INDENT_LEVEL=None
+else:
+  INDENT_LEVEL=2
+
 
 import sys, pg_logger, json
 
 
 def json_finalizer(input_code, output_trace):
   ret = dict(code=input_code, trace=output_trace)
-  json_output = json.dumps(ret, indent=None) # use indent=None for most compact repr
+  json_output = json.dumps(ret, indent=INDENT_LEVEL)
   print(json_output)
 
 
diff --git a/PyTutorGAE/js/opt-frontend.js b/PyTutorGAE/js/opt-frontend.js
index 446ea0fe7..21075179d 100644
--- a/PyTutorGAE/js/opt-frontend.js
+++ b/PyTutorGAE/js/opt-frontend.js
@@ -323,6 +323,10 @@ $(document).ready(function() {
     $.get("example-code/closures/closure5.txt", setCodeMirrorVal);
     return false;
   });
+  $('#lambdaParamLink').click(function() {
+    $.get("example-code/closures/lambda-param.txt", setCodeMirrorVal);
+    return false;
+  });
 
 
   $('#aliasing1Link').click(function() {
diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index 158ca0cac..c9771975f 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -377,6 +377,38 @@ def create_encoded_stack_entry(cur_frame):
             if (type(v) in (types.FunctionType, types.MethodType) and \
                 v not in self.closures and \
                 v not in self.globally_defined_funcs):
+
+              '''
+              # Look for the presence of v.func_code (code object) in
+              # the constant pool (f_code.co_consts) of an enclosing
+              # stack frame, and set that frame as your parent.
+              #
+              # This technique properly handles lambdas passed as
+              # function parameters. e.g., this example:
+              #
+              # def foo(x):
+              #   bar(lambda y: x + y)
+              # def bar(a):
+              #   print a(20)
+              # foo(10)
+              chosen_parent_frame = None
+              for (my_frame, my_lineno) in self.stack:
+                if chosen_parent_frame:
+                  break
+
+                for frame_const in my_frame.f_code.co_consts:
+                  if frame_const is v.func_code:
+                    chosen_parent_frame = my_frame
+                    break
+
+              assert chosen_parent_frame # I hope this always passes :0
+
+              self.closures[v] = chosen_parent_frame
+              self.parent_frames_set.add(chosen_parent_frame) # unequivocally add to this set!!!
+              if not chosen_parent_frame in self.zombie_frames:
+                self.zombie_frames.append(chosen_parent_frame)
+              '''
+
               self.closures[v] = top_frame
               self.parent_frames_set.add(top_frame) # unequivocally add to this set!!!
               if not top_frame in self.zombie_frames:
diff --git a/PyTutorGAE/tests/backend-tests/caught_exception_1.txt b/PyTutorGAE/tests/backend-tests/caught_exception_1.txt
new file mode 100644
index 000000000..1bf3cdec0
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/caught_exception_1.txt
@@ -0,0 +1,5 @@
+try:
+  x = 1 / 0
+except:
+  print "DIVIDE BY ZERO"
+
diff --git a/PyTutorGAE/tests/backend-tests/caught_exception_2.txt b/PyTutorGAE/tests/backend-tests/caught_exception_2.txt
new file mode 100644
index 000000000..57c17019c
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/caught_exception_2.txt
@@ -0,0 +1,12 @@
+# caught exception:
+try:
+  x = 1 / 0
+except:
+  print "DIVIDE BY ZERO"
+
+
+# uncaught:
+print y
+
+print "should not reach here"
+
diff --git a/PyTutorGAE/tests/backend-tests/circ_ref.txt b/PyTutorGAE/tests/backend-tests/circ_ref.txt
new file mode 100644
index 000000000..7af6d5e6d
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/circ_ref.txt
@@ -0,0 +1,5 @@
+# true circular reference
+
+x = [1, 2]
+x.append(x)
+
diff --git a/PyTutorGAE/tests/backend-tests/circ_ref_2.txt b/PyTutorGAE/tests/backend-tests/circ_ref_2.txt
new file mode 100644
index 000000000..49502c869
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/circ_ref_2.txt
@@ -0,0 +1,6 @@
+# true indirect circular reference
+
+x = [1, 2]
+y = [3, 4, x]
+x.append(y)
+
diff --git a/PyTutorGAE/tests/backend-tests/circ_ref_fake.txt b/PyTutorGAE/tests/backend-tests/circ_ref_fake.txt
new file mode 100644
index 000000000..3bbcc94f2
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/circ_ref_fake.txt
@@ -0,0 +1,7 @@
+# not a true circular reference
+
+a = [10, 20, 30]
+b = a
+c = [10, 20, 30]
+d = (a, b, c)
+
diff --git a/PyTutorGAE/tests/backend-tests/class_test.txt b/PyTutorGAE/tests/backend-tests/class_test.txt
new file mode 100644
index 000000000..f5046f056
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/class_test.txt
@@ -0,0 +1,13 @@
+class Point:
+    def __init__(self, x, y):
+        self.x = x
+        self.y = y
+    
+    def __str__(self):
+        return "(%d, %d)" % (self.x, self.y)
+
+p = Point(1, 2)
+print p
+p2 = Point(3, -4)
+print p2
+
diff --git a/PyTutorGAE/tests/backend-tests/class_test_2.txt b/PyTutorGAE/tests/backend-tests/class_test_2.txt
new file mode 100644
index 000000000..47a9e13bb
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/class_test_2.txt
@@ -0,0 +1,8 @@
+class Outer():
+   pass
+
+o = Outer()
+o.a = 5
+o.b = "Hi"
+print o
+
diff --git a/PyTutorGAE/tests/backend-tests/class_test_3.txt b/PyTutorGAE/tests/backend-tests/class_test_3.txt
new file mode 100644
index 000000000..a4a8068a0
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/class_test_3.txt
@@ -0,0 +1,16 @@
+class Staff601:
+    course = '6.01'
+    building = 34
+    room = 501
+
+pat = Staff601()
+print pat.course
+
+pat.name = 'Pat'
+pat.age = 60
+pat.role = 'Professor'
+
+print pat.building
+pat.building = 32
+print pat.building
+
diff --git a/PyTutorGAE/tests/backend-tests/data_test.txt b/PyTutorGAE/tests/backend-tests/data_test.txt
new file mode 100644
index 000000000..664717167
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/data_test.txt
@@ -0,0 +1,4 @@
+x = ('hello', 'world', 1, 2, 3, 'goodbye')
+y = list(x)
+z = set(x)
+w = {"joe" : 5, "mindy" : 6, "jack" : 7}
diff --git a/PyTutorGAE/tests/backend-tests/dict_error.txt b/PyTutorGAE/tests/backend-tests/dict_error.txt
new file mode 100644
index 000000000..fb6ed90ee
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/dict_error.txt
@@ -0,0 +1,4 @@
+def foo():
+  local_y[('tup', 'le')] = set([1, 2, 3])
+
+foo()
diff --git a/PyTutorGAE/tests/backend-tests/dict_test.txt b/PyTutorGAE/tests/backend-tests/dict_test.txt
new file mode 100644
index 000000000..41b541c1c
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/dict_test.txt
@@ -0,0 +1,10 @@
+x = {1 : 2}
+x[('tup', 'le')] = set([1, 2, 3])
+
+def foo():
+  local_x = {1 : 2}
+  local_y = {}
+  local_y[('tup', 'le')] = set([1, 2, 3])
+  print "hello", local_y.values()
+
+foo()
diff --git a/PyTutorGAE/tests/backend-tests/exec_test.txt b/PyTutorGAE/tests/backend-tests/exec_test.txt
new file mode 100644
index 000000000..0d44e327d
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/exec_test.txt
@@ -0,0 +1 @@
+exec "import os; os.system('echo security breach')"
diff --git a/PyTutorGAE/tests/backend-tests/func_exception.txt b/PyTutorGAE/tests/backend-tests/func_exception.txt
new file mode 100644
index 000000000..991a8253d
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/func_exception.txt
@@ -0,0 +1,7 @@
+def g(x,y):
+    print("In g")
+    ans = x/y
+    return ans
+ 
+g(5, 0)
+
diff --git a/PyTutorGAE/tests/backend-tests/generator_test.txt b/PyTutorGAE/tests/backend-tests/generator_test.txt
new file mode 100644
index 000000000..f17609e64
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/generator_test.txt
@@ -0,0 +1,3 @@
+x = (e for e in range(10))
+y = x
+z = (e for e in range(10))
diff --git a/PyTutorGAE/tests/backend-tests/import_error.txt b/PyTutorGAE/tests/backend-tests/import_error.txt
new file mode 100644
index 000000000..028a74e54
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/import_error.txt
@@ -0,0 +1,4 @@
+# should NOT allow for any imports
+import os
+
+os.system("echo security breach")
diff --git a/PyTutorGAE/tests/backend-tests/infinite_loop.txt b/PyTutorGAE/tests/backend-tests/infinite_loop.txt
new file mode 100644
index 000000000..bce78d1d0
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/infinite_loop.txt
@@ -0,0 +1,12 @@
+# Fibonacci!!!
+
+arr = [1, 1]
+
+print arr[0]
+
+while True:
+  print arr[-1]
+  tmp = sum(arr)
+  arr.append(tmp)
+  del arr[0]
+
diff --git a/PyTutorGAE/tests/backend-tests/infinite_loop_one_liner.txt b/PyTutorGAE/tests/backend-tests/infinite_loop_one_liner.txt
new file mode 100644
index 000000000..9b79fb99d
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/infinite_loop_one_liner.txt
@@ -0,0 +1 @@
+while 1: print "hahahaha"
diff --git a/PyTutorGAE/tests/backend-tests/lambda_1.txt b/PyTutorGAE/tests/backend-tests/lambda_1.txt
new file mode 100644
index 000000000..90504b5ec
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/lambda_1.txt
@@ -0,0 +1,12 @@
+def summation(low, high, f, next):
+  s = 0
+  x = low
+  while x <= high:
+    s = s + f(x)
+    x = next(x)
+  return s
+
+def sumsquares(low, high):
+  return summation(low, high, lambda x: x**2, lambda x: x+1)
+
+print sumsquares(1, 5)
diff --git a/PyTutorGAE/tests/backend-tests/list_dict_test.txt b/PyTutorGAE/tests/backend-tests/list_dict_test.txt
new file mode 100644
index 000000000..1d8179f6c
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/list_dict_test.txt
@@ -0,0 +1,6 @@
+x = {}
+l = ['hello', "world", 'goodbye']
+for (i, e) in enumerate(l):
+    x[e] = i
+print x
+
diff --git a/PyTutorGAE/tests/backend-tests/list_test.txt b/PyTutorGAE/tests/backend-tests/list_test.txt
new file mode 100644
index 000000000..a56999261
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/list_test.txt
@@ -0,0 +1 @@
+x = [1, 2, "hello", (3, 4)]
diff --git a/PyTutorGAE/tests/backend-tests/newstyle_class.txt b/PyTutorGAE/tests/backend-tests/newstyle_class.txt
new file mode 100644
index 000000000..315cda7e3
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/newstyle_class.txt
@@ -0,0 +1,15 @@
+class A(object):
+  bla = "A"
+  def __init__(self):
+    self.blb = "B"
+
+  def x(self):
+    self.bla = self.blb
+
+a = A()
+
+a.x()
+
+print a.bla
+print A.bla
+
diff --git a/PyTutorGAE/tests/backend-tests/one_func.txt b/PyTutorGAE/tests/backend-tests/one_func.txt
new file mode 100644
index 000000000..ce141aa36
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/one_func.txt
@@ -0,0 +1,8 @@
+def add(a, b, c):
+  d = a + b
+  return c + d
+
+x = 5
+y = 10
+z = x * y
+print add(x, y, z)
diff --git a/PyTutorGAE/tests/backend-tests/open_error.txt b/PyTutorGAE/tests/backend-tests/open_error.txt
new file mode 100644
index 000000000..5f2bee2e7
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/open_error.txt
@@ -0,0 +1,3 @@
+for line in open("/etc/passwd"):
+    print line
+
diff --git a/PyTutorGAE/tests/backend-tests/parse_error.txt b/PyTutorGAE/tests/backend-tests/parse_error.txt
new file mode 100644
index 000000000..efab03533
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/parse_error.txt
@@ -0,0 +1,6 @@
+x = 0
+for i in range(10):
+  x += 1
+   print x
+  x += 1
+
diff --git a/PyTutorGAE/tests/backend-tests/parse_error_2.txt b/PyTutorGAE/tests/backend-tests/parse_error_2.txt
new file mode 100644
index 000000000..80070e74b
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/parse_error_2.txt
@@ -0,0 +1,5 @@
+x = 5
+y = x
+z = x + y
+
+for x haslk;fjlasfhlkjl;sa
diff --git a/PyTutorGAE/tests/backend-tests/parse_error_3.txt b/PyTutorGAE/tests/backend-tests/parse_error_3.txt
new file mode 100644
index 000000000..bcc7bbf0e
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/parse_error_3.txt
@@ -0,0 +1,6 @@
+x = []
+for i in range(10):
+    x.append(i)
+    if i == 24:
+        pass
+   print y
diff --git a/PyTutorGAE/tests/backend-tests/print_builtins_error.txt b/PyTutorGAE/tests/backend-tests/print_builtins_error.txt
new file mode 100644
index 000000000..d4d03e56f
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/print_builtins_error.txt
@@ -0,0 +1 @@
+print __builtins__
diff --git a/PyTutorGAE/tests/backend-tests/runtime_error.txt b/PyTutorGAE/tests/backend-tests/runtime_error.txt
new file mode 100644
index 000000000..57124a66e
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/runtime_error.txt
@@ -0,0 +1,8 @@
+x = 5
+for i in range(10):
+  if i == x:
+    z = x + y # ERROR!
+  else:
+    z = i
+  print z
+
diff --git a/PyTutorGAE/tests/backend-tests/set_test.txt b/PyTutorGAE/tests/backend-tests/set_test.txt
new file mode 100644
index 000000000..72ca6fa0a
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/set_test.txt
@@ -0,0 +1,7 @@
+x = set()
+x.add('a')
+x.add('a')
+x.add('b')
+x.add('c')
+x.add('b')
+
diff --git a/PyTutorGAE/tests/backend-tests/simple.txt b/PyTutorGAE/tests/backend-tests/simple.txt
new file mode 100644
index 000000000..12b847786
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/simple.txt
@@ -0,0 +1,7 @@
+x = 5
+y = 10
+z = x * y
+print "HELLO WORLD"
+for i in range(10):
+  print z * i
+
diff --git a/PyTutorGAE/tests/backend-tests/three_lists.txt b/PyTutorGAE/tests/backend-tests/three_lists.txt
new file mode 100644
index 000000000..388dffc20
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/three_lists.txt
@@ -0,0 +1,13 @@
+# test case submitted by Peter Wentworth (p.wentworth@ru.ac.za)
+
+def f(xs):
+    print(xs)
+
+a = [10, 20, 30]
+b = a
+c = [10, 20, 30]
+d = 24
+e = (a, b, c)
+
+f(b)
+
diff --git a/PyTutorGAE/tests/backend-tests/tuple_test.txt b/PyTutorGAE/tests/backend-tests/tuple_test.txt
new file mode 100644
index 000000000..de68176ca
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/tuple_test.txt
@@ -0,0 +1,3 @@
+x = (1, 2, 3)
+y = (4,)
+
diff --git a/PyTutorGAE/tests/backend-tests/two_funcs.txt b/PyTutorGAE/tests/backend-tests/two_funcs.txt
new file mode 100644
index 000000000..4a07fd3b9
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/two_funcs.txt
@@ -0,0 +1,14 @@
+def add(a, b, c):
+  d = a + b
+  return c + d
+
+def double_add(a, b, c):
+  x = add(a, b, c)
+  y = add(a, b, c)
+  return x + y
+
+x = 5
+y = 10
+z = x * y
+print add(x, y, z)
+print double_add(x, y, z)
diff --git a/PyTutorGAE/tests/golden_test.py b/PyTutorGAE/tests/golden_test.py
new file mode 100644
index 000000000..ad4563c57
--- /dev/null
+++ b/PyTutorGAE/tests/golden_test.py
@@ -0,0 +1,166 @@
+''' 
+A simple framework for regression testing based on golden files
+by Philip Guo
+
+customized for the Online Python Tutor project
+'''
+
+import os, shutil, optparse, difflib
+from subprocess import *
+
+
+PROGRAM = 'python'
+
+INPUT_FILE_EXTENSION = '.txt' # input test files are .txt, NOT .py
+OUTPUT_FILE = 'out.trace'
+
+
+ALL_TESTS = []
+
+for (pwd, subdirs, files) in os.walk('.', followlinks=True): # need to follow example-code symlink
+  for f in files:
+    (base, ext) = os.path.splitext(f)
+    if ext == INPUT_FILE_EXTENSION:
+      fullpath = os.path.join(pwd, f)
+      ALL_TESTS.append(fullpath)
+
+
+def filter_output(s):
+  return s
+
+
+def execute(input_filename):
+  assert os.path.isfile(input_filename)
+  (base, ext) = os.path.splitext(input_filename)
+  assert ext == INPUT_FILE_EXTENSION
+
+  (stdout, stderr) = Popen([PROGRAM, input_filename], stdout=PIPE, stderr=PIPE).  communicate()
+
+  if stderr:
+    print '  CONTAINS ERROR'
+    #print '{'
+    #print stderr, '}'
+
+  assert os.path.isfile(OUTPUT_FILE)
+  outfile = base + '.out'
+  os.rename(OUTPUT_FILE, outfile)
+
+
+def clobber_golden_file(golden_file):
+  (base, ext) = os.path.splitext(golden_file)
+  outfile = base + '.out'
+  assert os.path.isfile(outfile)
+  print '  Clobber %s => %s' % (outfile, golden_file)
+  shutil.copy(outfile, golden_file)
+
+
+# returns True if there is a diff, False otherwise
+def golden_differs_from_out(golden_file):
+  (base, ext) = os.path.splitext(golden_file)
+  outfile = base + '.out'
+  assert os.path.isfile(outfile)
+  assert os.path.isfile(golden_file)
+
+  golden_s = open(golden_file).readlines()
+  out_s = open(outfile).readlines()
+
+  golden_s_filtered = filter_output(golden_s)
+  out_s_filtered = filter_output(out_s)
+
+  return out_s_filtered != golden_s_filtered
+
+
+def diff_test_output(test_name):
+  (base, ext) = os.path.splitext(test_name)
+
+  golden_file = os.path.join(TEST_DIR, base + '.golden')
+  assert os.path.isfile(golden_file)
+  outfile = os.path.join(TEST_DIR, base + '.out')
+  assert os.path.isfile(outfile)
+
+  golden_s = open(golden_file).readlines()
+  out_s = open(outfile).readlines()
+
+  golden_s_filtered = filter_output(golden_s)
+  out_s_filtered = filter_output(out_s)
+
+  first_line = True
+  for line in difflib.unified_diff(golden_s_filtered, out_s_filtered, \
+                                   fromfile=golden_file, tofile=outfile):
+    if first_line:
+      print # print an extra line to ease readability
+      first_line = False
+    print line,
+
+
+def run_test(input_filename, clobber_golden=False):
+  print 'Testing', input_filename
+
+  (base, ext) = os.path.splitext(input_filename)
+  assert ext == INPUT_FILE_EXTENSION
+
+  # to eliminate possibility of using stale output:
+  outfile = base + '.out'
+  if os.path.isfile(outfile):
+    os.remove(outfile)
+
+  input_fullpath = os.path.join(TEST_DIR, input_filename)
+  execute(input_fullpath)
+
+  golden_file = os.path.join(TEST_DIR, base + '.golden')
+  if os.path.isfile(golden_file):
+    if golden_differs_from_out(golden_file):
+      print "  FAILED"
+    if clobber_golden:
+      clobber_golden_file(golden_file)
+  else:
+    clobber_golden_file(golden_file)
+
+
+def run_all_tests(clobber=False):
+  for t in ALL_TESTS:
+    run_test(t, clobber)
+
+def diff_all_test_outputs():
+  for t in ALL_TESTS:
+    diff_test_output(t)
+
+
+if __name__ == "__main__":
+  parser = optparse.OptionParser()
+  parser.add_option("--all", action="store_true", dest="run_all",
+                    help="Run all tests")
+  parser.add_option("--only-clobber", action="store_true", dest="only_clobber",
+                    help="Clobber ALL golden files WITHOUT re-running tests")
+  parser.add_option("--clobber", action="store_true", dest="clobber",
+                    help="Clobber golden files when running tests")
+  parser.add_option("--test", dest="test_name",
+                    help="Run one test")
+  parser.add_option("--difftest", dest="diff_test_name",
+                    help="Diff against .golden for one test")
+  parser.add_option("--diffall", action="store_true", dest="diff_all",
+                    help="Diff against .golden for all tests")
+  (options, args) = parser.parse_args()
+  if options.run_all:
+    if options.clobber:
+      print 'Running all tests and clobbering results ...'
+    else:
+      print 'Running all tests ...'
+    run_all_tests(options.clobber)
+
+  elif options.diff_all:
+    diff_all_test_outputs()
+  elif options.diff_test_name:
+    assert options.diff_test_name in ALL_TESTS
+    diff_test_output(options.diff_test_name)
+  elif options.test_name:
+    assert options.test_name in ALL_TESTS
+    run_test(options.test_name, options.clobber)
+  elif options.only_clobber:
+    for t in ALL_TESTS:
+      (base, ext) = os.path.splitext(t)
+      golden_file = os.path.join(TEST_DIR, base + '.golden')
+      clobber_golden_file(golden_file)
+  else:
+    parser.print_help()
+
diff --git a/PyTutorGAE/tutor.html b/PyTutorGAE/tutor.html
index db3174b6c..920741ad4 100644
--- a/PyTutorGAE/tutor.html
+++ b/PyTutorGAE/tutor.html
@@ -110,7 +110,8 @@
 closure 2 |
 closure 3 |
 closure 4 |
-closure 5
+closure 5 |
+lambda param
 
 

 
diff --git a/example-code/closures/lambda-param.txt b/example-code/closures/lambda-param.txt
new file mode 100644
index 000000000..5bf9dcecb
--- /dev/null
+++ b/example-code/closures/lambda-param.txt
@@ -0,0 +1,7 @@
+def foo(x):
+  bar(lambda y: x + y)
+
+def bar(a):
+  print a(20)
+
+foo(10)

From b774711d4bef0c0a18bc75a8563d2cad251aace7 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 21 Aug 2012 11:55:09 -0700
Subject: [PATCH 144/502] added regression tests

---
 .../backend-tests/caught_exception_1.golden   |    66 +
 .../backend-tests/caught_exception_2.golden   |    77 +
 .../tests/backend-tests/circ_ref.golden       |    65 +
 .../tests/backend-tests/circ_ref_2.golden     |   116 +
 .../tests/backend-tests/circ_ref_fake.golden  |   168 +
 .../tests/backend-tests/class_test.golden     |  2725 ++++
 .../tests/backend-tests/class_test_2.golden   |   285 +
 .../tests/backend-tests/class_test_3.golden   |   641 +
 .../tests/backend-tests/data_test.golden      |   213 +
 .../tests/backend-tests/dict_error.golden     |   207 +
 .../tests/backend-tests/dict_test.golden      |   730 +
 .../tests/backend-tests/exec_test.golden      |    84 +
 .../tests/backend-tests/func_exception.golden |   270 +
 .../tests/backend-tests/generator_test.golden |   100 +
 .../tests/backend-tests/import_error.golden   |    64 +
 .../tests/backend-tests/infinite_loop.golden  |  7545 +++++++++++
 .../infinite_loop_one_liner.golden            |  3009 +++++
 .../tests/backend-tests/lambda_1.golden       |  5460 ++++++++
 .../tests/backend-tests/list_dict_test.golden |   416 +
 .../tests/backend-tests/list_test.golden      |    48 +
 .../tests/backend-tests/newstyle_class.golden |  1597 +++
 .../tests/backend-tests/one_func.golden       |   350 +
 .../tests/backend-tests/open_error.golden     |  1233 ++
 .../tests/backend-tests/parse_error.golden    |    11 +
 .../tests/backend-tests/parse_error_2.golden  |    11 +
 .../tests/backend-tests/parse_error_3.golden  |    11 +
 .../backend-tests/print_builtins_error.golden |    19 +
 .../tests/backend-tests/runtime_error.golden  |   440 +
 .../tests/backend-tests/set_test.golden       |   151 +
 PyTutorGAE/tests/backend-tests/simple.golden  |   501 +
 .../tests/backend-tests/three_lists.golden    |   632 +
 .../tests/backend-tests/tuple_test.golden     |    72 +
 .../tests/backend-tests/two_funcs.golden      |  1453 ++
 PyTutorGAE/tests/golden_test.py               |    27 +-
 example-code/aliasing.golden                  |  2067 +++
 example-code/aliasing/aliasing1.golden        |    98 +
 example-code/aliasing/aliasing2.golden        |    90 +
 example-code/aliasing/aliasing3.golden        |   335 +
 example-code/aliasing/aliasing4.golden        |    67 +
 example-code/aliasing/aliasing5.golden        |   455 +
 example-code/aliasing/aliasing6.golden        |   327 +
 example-code/aliasing/aliasing7.golden        |   248 +
 example-code/aliasing/aliasing8.golden        |   229 +
 example-code/closures/closure1.golden         |   567 +
 example-code/closures/closure2.golden         |  1764 +++
 example-code/closures/closure3.golden         |  1400 ++
 example-code/closures/closure4.golden         |  1457 ++
 example-code/closures/closure5.golden         |  7684 +++++++++++
 example-code/closures/lambda-param.golden     |   797 ++
 example-code/fact.golden                      |  1909 +++
 example-code/fib.golden                       |  7545 +++++++++++
 example-code/filter.golden                    |  1505 +++
 example-code/ins_sort.golden                  |  3538 +++++
 example-code/linked-lists/ll1.golden          |  1977 +++
 example-code/linked-lists/ll2.golden          | 10032 ++++++++++++++
 example-code/map.golden                       |  6996 ++++++++++
 example-code/memo_fib.golden                  | 10715 +++++++++++++++
 example-code/oop_1.golden                     |  2448 ++++
 example-code/oop_2.golden                     |  2236 ++++
 example-code/oop_inherit.golden               |  3181 +++++
 example-code/oop_small.golden                 |  2093 +++
 example-code/py_tutorial.golden               |  4754 +++++++
 example-code/sqrt.golden                      |  8929 +++++++++++++
 example-code/strtok.golden                    |   258 +
 example-code/sum-cubes.golden                 |  1693 +++
 example-code/sum.golden                       | 10030 ++++++++++++++
 example-code/towers_of_hanoi.golden           | 10996 ++++++++++++++++
 example-code/wentworth_gcd.golden             |  3798 ++++++
 example-code/wentworth_sumList.golden         |  4520 +++++++
 example-code/wentworth_try_finally.golden     |  2823 ++++
 70 files changed, 148348 insertions(+), 10 deletions(-)
 create mode 100644 PyTutorGAE/tests/backend-tests/caught_exception_1.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/caught_exception_2.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/circ_ref.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/circ_ref_2.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/circ_ref_fake.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/class_test.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/class_test_2.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/class_test_3.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/data_test.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/dict_error.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/dict_test.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/exec_test.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/func_exception.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/generator_test.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/import_error.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/infinite_loop.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/infinite_loop_one_liner.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/lambda_1.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/list_dict_test.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/list_test.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/newstyle_class.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/one_func.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/open_error.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/parse_error.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/parse_error_2.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/parse_error_3.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/print_builtins_error.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/runtime_error.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/set_test.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/simple.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/three_lists.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/tuple_test.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/two_funcs.golden
 create mode 100644 example-code/aliasing.golden
 create mode 100644 example-code/aliasing/aliasing1.golden
 create mode 100644 example-code/aliasing/aliasing2.golden
 create mode 100644 example-code/aliasing/aliasing3.golden
 create mode 100644 example-code/aliasing/aliasing4.golden
 create mode 100644 example-code/aliasing/aliasing5.golden
 create mode 100644 example-code/aliasing/aliasing6.golden
 create mode 100644 example-code/aliasing/aliasing7.golden
 create mode 100644 example-code/aliasing/aliasing8.golden
 create mode 100644 example-code/closures/closure1.golden
 create mode 100644 example-code/closures/closure2.golden
 create mode 100644 example-code/closures/closure3.golden
 create mode 100644 example-code/closures/closure4.golden
 create mode 100644 example-code/closures/closure5.golden
 create mode 100644 example-code/closures/lambda-param.golden
 create mode 100644 example-code/fact.golden
 create mode 100644 example-code/fib.golden
 create mode 100644 example-code/filter.golden
 create mode 100644 example-code/ins_sort.golden
 create mode 100644 example-code/linked-lists/ll1.golden
 create mode 100644 example-code/linked-lists/ll2.golden
 create mode 100644 example-code/map.golden
 create mode 100644 example-code/memo_fib.golden
 create mode 100644 example-code/oop_1.golden
 create mode 100644 example-code/oop_2.golden
 create mode 100644 example-code/oop_inherit.golden
 create mode 100644 example-code/oop_small.golden
 create mode 100644 example-code/py_tutorial.golden
 create mode 100644 example-code/sqrt.golden
 create mode 100644 example-code/strtok.golden
 create mode 100644 example-code/sum-cubes.golden
 create mode 100644 example-code/sum.golden
 create mode 100644 example-code/towers_of_hanoi.golden
 create mode 100644 example-code/wentworth_gcd.golden
 create mode 100644 example-code/wentworth_sumList.golden
 create mode 100644 example-code/wentworth_try_finally.golden

diff --git a/PyTutorGAE/tests/backend-tests/caught_exception_1.golden b/PyTutorGAE/tests/backend-tests/caught_exception_1.golden
new file mode 100644
index 000000000..7ca09e459
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/caught_exception_1.golden
@@ -0,0 +1,66 @@
+{
+  "code": "try:\n  x = 1 / 0\nexcept:\n  print \"DIVIDE BY ZERO\"\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "exception_msg": "ZeroDivisionError: integer division or modulo by zero", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "exception"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "DIVIDE BY ZERO\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 4, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/caught_exception_2.golden b/PyTutorGAE/tests/backend-tests/caught_exception_2.golden
new file mode 100644
index 000000000..75a3122cd
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/caught_exception_2.golden
@@ -0,0 +1,77 @@
+{
+  "code": "# caught exception:\ntry:\n  x = 1 / 0\nexcept:\n  print \"DIVIDE BY ZERO\"\n\n\n# uncaught:\nprint y\n\nprint \"should not reach here\"\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "exception_msg": "ZeroDivisionError: integer division or modulo by zero", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "exception"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "DIVIDE BY ZERO\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "DIVIDE BY ZERO\n", 
+      "exception_msg": "NameError: name 'y' is not defined", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 9, 
+      "event": "exception"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/circ_ref.golden b/PyTutorGAE/tests/backend-tests/circ_ref.golden
new file mode 100644
index 000000000..ea8bc5c65
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/circ_ref.golden
@@ -0,0 +1,65 @@
+{
+  "code": "# true circular reference\n\nx = [1, 2]\nx.append(x)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2, 
+          [
+            "REF", 
+            1
+          ]
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/circ_ref_2.golden b/PyTutorGAE/tests/backend-tests/circ_ref_2.golden
new file mode 100644
index 000000000..c1fb56894
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/circ_ref_2.golden
@@ -0,0 +1,116 @@
+{
+  "code": "# true indirect circular reference\n\nx = [1, 2]\ny = [3, 4, x]\nx.append(y)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          2
+        ], 
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2
+        ], 
+        "2": [
+          "LIST", 
+          3, 
+          4, 
+          [
+            "REF", 
+            1
+          ]
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          2
+        ], 
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2, 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          3, 
+          4, 
+          [
+            "REF", 
+            1
+          ]
+        ]
+      }, 
+      "line": 5, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/circ_ref_fake.golden b/PyTutorGAE/tests/backend-tests/circ_ref_fake.golden
new file mode 100644
index 000000000..11e8e7d50
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/circ_ref_fake.golden
@@ -0,0 +1,168 @@
+{
+  "code": "# not a true circular reference\n\na = [10, 20, 30]\nb = a\nc = [10, 20, 30]\nd = (a, b, c)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "a"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "a", 
+        "b"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ], 
+        "b": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "a", 
+        "b", 
+        "c"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ], 
+        "c": [
+          "REF", 
+          2
+        ], 
+        "b": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "a", 
+        "b", 
+        "c", 
+        "d"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ], 
+        "c": [
+          "REF", 
+          2
+        ], 
+        "b": [
+          "REF", 
+          1
+        ], 
+        "d": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ], 
+        "3": [
+          "TUPLE", 
+          [
+            "REF", 
+            1
+          ], 
+          [
+            "REF", 
+            1
+          ], 
+          [
+            "REF", 
+            2
+          ]
+        ]
+      }, 
+      "line": 6, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/class_test.golden b/PyTutorGAE/tests/backend-tests/class_test.golden
new file mode 100644
index 000000000..882d13ef9
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/class_test.golden
@@ -0,0 +1,2725 @@
+{
+  "code": "class Point:\n    def __init__(self, x, y):\n        self.x = x\n        self.y = y\n    \n    def __str__(self):\n        return \"(%d, %d)\" % (self.x, self.y)\n\np = Point(1, 2)\nprint p\np2 = Point(3, -4)\nprint p2\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Point", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Point", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Point_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Point", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Point", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Point_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Point", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Point", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Point_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Point", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__init__": [
+              "REF", 
+              1
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "Point", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Point_f1_p", 
+          "ordered_varnames": [
+            "__init__"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "__init__(self, x, y)", 
+          1
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Point", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "__str__": [
+              "REF", 
+              3
+            ], 
+            "__init__": [
+              "REF", 
+              1
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "Point", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Point_f1_p", 
+          "ordered_varnames": [
+            "__init__", 
+            "__str__", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "__init__(self, x, y)", 
+          1
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
+        "3": [
+          "FUNCTION", 
+          "__str__(self)", 
+          1
+        ]
+      }, 
+      "line": 6, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "Point"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "__str__": [
+              "REF", 
+              3
+            ], 
+            "__init__": [
+              "REF", 
+              1
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Point", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Point_f1_p_z", 
+          "ordered_varnames": [
+            "__init__", 
+            "__str__", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "Point": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "__init__(self, x, y)", 
+          1
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
+        "3": [
+          "FUNCTION", 
+          "__str__(self)", 
+          1
+        ], 
+        "4": [
+          "CLASS", 
+          "Point", 
+          [], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Point"
+      ], 
+      "stdout": "", 
+      "func_name": "__init__", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "__str__": [
+              "REF", 
+              3
+            ], 
+            "__init__": [
+              "REF", 
+              1
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Point", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Point_f1_p_z", 
+          "ordered_varnames": [
+            "__init__", 
+            "__str__", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "self": [
+              "REF", 
+              5
+            ]
+          }, 
+          "is_highlighted": true, 
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+          "Point", 
+          [
+            "x", 
+            1
+          ], 
+          [
+            "y", 
+            2
+          ]
+        ], 
+        "6": [
+          "INSTANCE", 
+          "Point", 
+          [
+            "x", 
+            3
+          ], 
+          [
+            "y", 
+            -4
+          ]
+        ]
+      }, 
+      "line": 7, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "Point", 
+        "p", 
+        "p2"
+      ], 
+      "stdout": "(1, 2)\n(3, -4)\n", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "__str__": [
+              "REF", 
+              3
+            ], 
+            "__init__": [
+              "REF", 
+              1
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Point", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Point_f1_p_z", 
+          "ordered_varnames": [
+            "__init__", 
+            "__str__", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "p2": [
+          "REF", 
+          6
+        ], 
+        "p": [
+          "REF", 
+          5
+        ], 
+        "Point": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "__init__(self, x, y)", 
+          1
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
+        "3": [
+          "FUNCTION", 
+          "__str__(self)", 
+          1
+        ], 
+        "4": [
+          "CLASS", 
+          "Point", 
+          [], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "5": [
+          "INSTANCE", 
+          "Point", 
+          [
+            "x", 
+            1
+          ], 
+          [
+            "y", 
+            2
+          ]
+        ], 
+        "6": [
+          "INSTANCE", 
+          "Point", 
+          [
+            "x", 
+            3
+          ], 
+          [
+            "y", 
+            -4
+          ]
+        ]
+      }, 
+      "line": 12, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/class_test_2.golden b/PyTutorGAE/tests/backend-tests/class_test_2.golden
new file mode 100644
index 000000000..ae2a4ddd0
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/class_test_2.golden
@@ -0,0 +1,285 @@
+{
+  "code": "class Outer():\n   pass\n\no = Outer()\no.a = 5\no.b = \"Hi\"\nprint o\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Outer", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Outer", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Outer_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Outer", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Outer", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Outer_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Outer", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Outer", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Outer_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Outer", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              1
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Outer", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Outer_f1", 
+          "ordered_varnames": [
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 2, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "Outer"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Outer": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Outer", 
+          []
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Outer", 
+        "o"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Outer": [
+          "REF", 
+          2
+        ], 
+        "o": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Outer", 
+          []
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Outer"
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Outer", 
+        "o"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Outer": [
+          "REF", 
+          2
+        ], 
+        "o": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Outer", 
+          []
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Outer", 
+          [
+            "a", 
+            5
+          ]
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Outer", 
+        "o"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Outer": [
+          "REF", 
+          2
+        ], 
+        "o": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Outer", 
+          []
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Outer", 
+          [
+            "a", 
+            5
+          ], 
+          [
+            "b", 
+            "Hi"
+          ]
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Outer", 
+        "o"
+      ], 
+      "stdout": "<__main__.Outer instance at 0xADDR>\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Outer": [
+          "REF", 
+          2
+        ], 
+        "o": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Outer", 
+          []
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Outer", 
+          [
+            "a", 
+            5
+          ], 
+          [
+            "b", 
+            "Hi"
+          ]
+        ]
+      }, 
+      "line": 7, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/class_test_3.golden b/PyTutorGAE/tests/backend-tests/class_test_3.golden
new file mode 100644
index 000000000..f351abf52
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/class_test_3.golden
@@ -0,0 +1,641 @@
+{
+  "code": "class Staff601:\n    course = '6.01'\n    building = 34\n    room = 501\n\npat = Staff601()\nprint pat.course\n\npat.name = 'Pat'\npat.age = 60\npat.role = 'Professor'\n\nprint pat.building\npat.building = 32\nprint pat.building\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "course": "6.01"
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": [
+            "course"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "course": "6.01"
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": [
+            "building", 
+            "course"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "course": "6.01", 
+            "__return__": [
+              "REF", 
+              1
+            ], 
+            "room": 501
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "room", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          2
+        ], 
+        "pat": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Staff601"
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          2
+        ], 
+        "pat": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Staff601"
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          2
+        ], 
+        "pat": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "name", 
+            "Pat"
+          ]
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          2
+        ], 
+        "pat": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "name", 
+            "Pat"
+          ]
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          2
+        ], 
+        "pat": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 13, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n34\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          2
+        ], 
+        "pat": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 14, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n34\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          2
+        ], 
+        "pat": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "building", 
+            32
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 15, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n34\n32\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          2
+        ], 
+        "pat": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "building", 
+            32
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 15, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/data_test.golden b/PyTutorGAE/tests/backend-tests/data_test.golden
new file mode 100644
index 000000000..68e3251eb
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/data_test.golden
@@ -0,0 +1,213 @@
+{
+  "code": "x = ('hello', 'world', 1, 2, 3, 'goodbye')\ny = list(x)\nz = set(x)\nw = {\"joe\" : 5, \"mindy\" : 6, \"jack\" : 7}\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "TUPLE", 
+          "hello", 
+          "world", 
+          1, 
+          2, 
+          3, 
+          "goodbye"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          2
+        ], 
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "TUPLE", 
+          "hello", 
+          "world", 
+          1, 
+          2, 
+          3, 
+          "goodbye"
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          1, 
+          2, 
+          3, 
+          "goodbye"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          2
+        ], 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "z": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "TUPLE", 
+          "hello", 
+          "world", 
+          1, 
+          2, 
+          3, 
+          "goodbye"
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          1, 
+          2, 
+          3, 
+          "goodbye"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3, 
+          "goodbye", 
+          "world", 
+          "hello"
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "w"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          2
+        ], 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "z": [
+          "REF", 
+          3
+        ], 
+        "w": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "TUPLE", 
+          "hello", 
+          "world", 
+          1, 
+          2, 
+          3, 
+          "goodbye"
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          1, 
+          2, 
+          3, 
+          "goodbye"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3, 
+          "goodbye", 
+          "world", 
+          "hello"
+        ], 
+        "4": [
+          "DICT", 
+          [
+            "mindy", 
+            6
+          ], 
+          [
+            "joe", 
+            5
+          ], 
+          [
+            "jack", 
+            7
+          ]
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/dict_error.golden b/PyTutorGAE/tests/backend-tests/dict_error.golden
new file mode 100644
index 000000000..1d65cbe41
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/dict_error.golden
@@ -0,0 +1,207 @@
+{
+  "code": "def foo():\n  local_y[('tup', 'le')] = set([1, 2, 3])\n\nfoo()\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "exception_msg": "NameError: global name 'local_y' is not defined", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "exception"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": null
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "exception_msg": "NameError: global name 'local_y' is not defined", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "exception"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/dict_test.golden b/PyTutorGAE/tests/backend-tests/dict_test.golden
new file mode 100644
index 000000000..7f6d1c5a5
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/dict_test.golden
@@ -0,0 +1,730 @@
+{
+  "code": "x = {1 : 2}\nx[('tup', 'le')] = set([1, 2, 3])\n\ndef foo():\n  local_x = {1 : 2}\n  local_y = {}\n  local_y[('tup', 'le')] = set([1, 2, 3])\n  print \"hello\", local_y.values()\n\nfoo()\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ]
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "foo": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "foo": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "foo": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "local_x": [
+              "REF", 
+              5
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "local_x"
+          ]
+        }
+      ], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "foo": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ], 
+        "5": [
+          "DICT", 
+          [
+            1, 
+            2
+          ]
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "local_y": [
+              "REF", 
+              6
+            ], 
+            "local_x": [
+              "REF", 
+              5
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "local_x", 
+            "local_y"
+          ]
+        }
+      ], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "foo": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ], 
+        "5": [
+          "DICT", 
+          [
+            1, 
+            2
+          ]
+        ], 
+        "6": [
+          "DICT"
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "local_y": [
+              "REF", 
+              6
+            ], 
+            "local_x": [
+              "REF", 
+              5
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "local_x", 
+            "local_y"
+          ]
+        }
+      ], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "foo": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ], 
+        "5": [
+          "DICT", 
+          [
+            1, 
+            2
+          ]
+        ], 
+        "6": [
+          "DICT", 
+          [
+            [
+              "REF", 
+              7
+            ], 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
+        "7": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "8": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "foo"
+      ], 
+      "stdout": "hello [set([1, 2, 3])]\n", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": null, 
+            "local_y": [
+              "REF", 
+              6
+            ], 
+            "local_x": [
+              "REF", 
+              5
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "local_x", 
+            "local_y", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "foo": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ], 
+        "5": [
+          "DICT", 
+          [
+            1, 
+            2
+          ]
+        ], 
+        "6": [
+          "DICT", 
+          [
+            [
+              "REF", 
+              7
+            ], 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
+        "7": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "8": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ]
+      }, 
+      "line": 8, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "foo"
+      ], 
+      "stdout": "hello [set([1, 2, 3])]\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "foo": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ]
+      }, 
+      "line": 10, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/exec_test.golden b/PyTutorGAE/tests/backend-tests/exec_test.golden
new file mode 100644
index 000000000..af1afcf98
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/exec_test.golden
@@ -0,0 +1,84 @@
+security breach
+{
+  "code": "exec \"import os; os.system('echo security breach')\"\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "os", 
+        "__package__"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "os": [
+          "REF", 
+          1
+        ], 
+        "__package__": null
+      }, 
+      "heap": {
+        "1": [
+          "module", 
+          ""
+        ]
+      }, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "os", 
+        "__package__"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "os": [
+          "REF", 
+          1
+        ], 
+        "__package__": null
+      }, 
+      "heap": {
+        "1": [
+          "module", 
+          ""
+        ]
+      }, 
+      "line": 1, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/func_exception.golden b/PyTutorGAE/tests/backend-tests/func_exception.golden
new file mode 100644
index 000000000..08975e74f
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/func_exception.golden
@@ -0,0 +1,270 @@
+{
+  "code": "def g(x,y):\n    print(\"In g\")\n    ans = x/y\n    return ans\n \ng(5, 0)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "g"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "g": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "g(x, y)", 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "g"
+      ], 
+      "stdout": "", 
+      "func_name": "g", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 0, 
+            "x": 5
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "g", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "g_f1", 
+          "ordered_varnames": [
+            "x", 
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "g": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "g(x, y)", 
+          null
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "g"
+      ], 
+      "stdout": "", 
+      "func_name": "g", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 0, 
+            "x": 5
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "g", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "g_f1", 
+          "ordered_varnames": [
+            "x", 
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "g": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "g(x, y)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "g"
+      ], 
+      "stdout": "In g\n", 
+      "func_name": "g", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 0, 
+            "x": 5
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "g", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "g_f1", 
+          "ordered_varnames": [
+            "x", 
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "g": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "g(x, y)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "g"
+      ], 
+      "stdout": "In g\n", 
+      "exception_msg": "ZeroDivisionError: integer division or modulo by zero", 
+      "func_name": "g", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 0, 
+            "x": 5
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "g", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "g_f1", 
+          "ordered_varnames": [
+            "x", 
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "g": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "g(x, y)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "exception"
+    }, 
+    {
+      "ordered_globals": [
+        "g"
+      ], 
+      "stdout": "In g\n", 
+      "func_name": "g", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 0, 
+            "x": 5, 
+            "__return__": null
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "g", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "g_f1", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "g": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "g(x, y)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "g"
+      ], 
+      "stdout": "In g\n", 
+      "exception_msg": "ZeroDivisionError: integer division or modulo by zero", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "g": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "g(x, y)", 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "exception"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/generator_test.golden b/PyTutorGAE/tests/backend-tests/generator_test.golden
new file mode 100644
index 000000000..845c6114f
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/generator_test.golden
@@ -0,0 +1,100 @@
+{
+  "code": "x = (e for e in range(10))\ny = x\nz = (e for e in range(10))\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "generator", 
+          " at 0xADDR>"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          1
+        ], 
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "generator", 
+          " at 0xADDR>"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          1
+        ], 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "z": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "generator", 
+          " at 0xADDR>"
+        ], 
+        "2": [
+          "generator", 
+          " at 0xADDR>"
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/import_error.golden b/PyTutorGAE/tests/backend-tests/import_error.golden
new file mode 100644
index 000000000..495ab6d33
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/import_error.golden
@@ -0,0 +1,64 @@
+security breach
+{
+  "code": "# should NOT allow for any imports\nimport os\n\nos.system(\"echo security breach\")\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "os", 
+        "__package__"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "os": [
+          "REF", 
+          1
+        ], 
+        "__package__": null
+      }, 
+      "heap": {
+        "1": [
+          "module", 
+          ""
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "os", 
+        "__package__"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "os": [
+          "REF", 
+          1
+        ], 
+        "__package__": null
+      }, 
+      "heap": {
+        "1": [
+          "module", 
+          ""
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/infinite_loop.golden b/PyTutorGAE/tests/backend-tests/infinite_loop.golden
new file mode 100644
index 000000000..1a9abd1e8
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/infinite_loop.golden
@@ -0,0 +1,7545 @@
+{
+  "code": "# Fibonacci!!!\n\narr = [1, 1]\n\nprint arr[0]\n\nwhile True:\n  print arr[-1]\n  tmp = sum(arr)\n  arr.append(tmp)\n  del arr[0]\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          1
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr"
+      ], 
+      "stdout": "1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          1
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr"
+      ], 
+      "stdout": "1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          1
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr"
+      ], 
+      "stdout": "1\n1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          1
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 2, 
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          1
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 2, 
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          1, 
+          2
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 2, 
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 2, 
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 2, 
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 3, 
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 3, 
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2, 
+          3
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 3, 
+        "arr": [
+          "REF", 
+          1
+        ]
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+    }
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+}
diff --git a/PyTutorGAE/tests/backend-tests/infinite_loop_one_liner.golden b/PyTutorGAE/tests/backend-tests/infinite_loop_one_liner.golden
new file mode 100644
index 000000000..dec2f630d
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/infinite_loop_one_liner.golden
@@ -0,0 +1,3009 @@
+{
+  "code": "while 1: print \"hahahaha\"\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
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+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
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+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
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+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
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+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
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+      "heap": {}, 
+      "line": 1, 
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+    {
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+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
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+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
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+    {
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+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
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+      "heap": {}, 
+      "line": 1, 
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+    {
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+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
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+    {
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+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
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+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
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+    {
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+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
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+      "heap": {}, 
+      "line": 1, 
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+    {
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+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
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+      "heap": {}, 
+      "line": 1, 
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+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
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+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
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+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
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+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
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+      "line": 1, 
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+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
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+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
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+    {
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+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
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+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
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+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
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+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "exception_msg": "(stopped after 300 steps to prevent possible infinite loop)", 
+      "event": "instruction_limit_reached"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/lambda_1.golden b/PyTutorGAE/tests/backend-tests/lambda_1.golden
new file mode 100644
index 000000000..ae5ae9068
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/lambda_1.golden
@@ -0,0 +1,5460 @@
+{
+  "code": "def summation(low, high, f, next):\n  s = 0\n  x = low\n  while x <= high:\n    s = s + f(x)\n    x = next(x)\n  return s\n\ndef sumsquares(low, high):\n  return summation(low, high, lambda x: x**2, lambda x: x+1)\n\nprint sumsquares(1, 5)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
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+      ], 
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+        ], 
+        "sumsquares": [
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+        ]
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+            "f", 
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+          ]
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+        ], 
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+        ]
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+      "event": "return"
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+        "sumsquares"
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+      "stdout": "55\n", 
+      "func_name": "", 
+      "stack_to_render": [
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+        ], 
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+          "\u03bb(x)", 
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+        ]
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+      "line": 12, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/list_dict_test.golden b/PyTutorGAE/tests/backend-tests/list_dict_test.golden
new file mode 100644
index 000000000..bd24d36df
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/list_dict_test.golden
@@ -0,0 +1,416 @@
+{
+  "code": "x = {}\nl = ['hello', \"world\", 'goodbye']\nfor (i, e) in enumerate(l):\n    x[e] = i\nprint x\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT"
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l", 
+        "i", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 0, 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": "hello", 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT"
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l", 
+        "i", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 0, 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": "hello", 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "hello", 
+            0
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l", 
+        "i", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": "world", 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "hello", 
+            0
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l", 
+        "i", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": "world", 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "world", 
+            1
+          ], 
+          [
+            "hello", 
+            0
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l", 
+        "i", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": "goodbye", 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "world", 
+            1
+          ], 
+          [
+            "hello", 
+            0
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l", 
+        "i", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": "goodbye", 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "world", 
+            1
+          ], 
+          [
+            "hello", 
+            0
+          ], 
+          [
+            "goodbye", 
+            2
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l", 
+        "i", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": "goodbye", 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "world", 
+            1
+          ], 
+          [
+            "hello", 
+            0
+          ], 
+          [
+            "goodbye", 
+            2
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l", 
+        "i", 
+        "e"
+      ], 
+      "stdout": "{'world': 1, 'hello': 0, 'goodbye': 2}\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": "goodbye", 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "world", 
+            1
+          ], 
+          [
+            "hello", 
+            0
+          ], 
+          [
+            "goodbye", 
+            2
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 5, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/list_test.golden b/PyTutorGAE/tests/backend-tests/list_test.golden
new file mode 100644
index 000000000..9d34156ff
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/list_test.golden
@@ -0,0 +1,48 @@
+{
+  "code": "x = [1, 2, \"hello\", (3, 4)]\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2, 
+          "hello", 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          3, 
+          4
+        ]
+      }, 
+      "line": 1, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/newstyle_class.golden b/PyTutorGAE/tests/backend-tests/newstyle_class.golden
new file mode 100644
index 000000000..f428115c5
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/newstyle_class.golden
@@ -0,0 +1,1597 @@
+{
+  "code": "class A(object):\n  bla = \"A\"\n  def __init__(self):\n    self.blb = \"B\"\n\n  def x(self):\n    self.bla = self.blb\n\na = A()\n\na.x()\n\nprint a.bla\nprint A.bla\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
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+          "unique_hash": "A_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "call"
+    }, 
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+      "stdout": "", 
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+          "encoded_locals": {}, 
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+      "heap": {}, 
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+      "event": "step_line"
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+          "frame_id": 1, 
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+      "event": "step_line"
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+        "A", 
+        "a"
+      ], 
+      "stdout": "B\n", 
+      "func_name": "", 
+      "stack_to_render": [
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+          ]
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+          "INSTANCE", 
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+            "bla", 
+            "B"
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+            "blb", 
+            "B"
+          ]
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+      }, 
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "A", 
+        "a"
+      ], 
+      "stdout": "B\nA\n", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
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+            ]
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+            ]
+          ], 
+          [
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+          ], 
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+              "REF", 
+              1
+            ]
+          ]
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+          "FUNCTION", 
+          "x(self)", 
+          1
+        ], 
+        "4": [
+          "CLASS", 
+          "A", 
+          [], 
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+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "bla", 
+            "A"
+          ], 
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+            "x", 
+            [
+              "REF", 
+              3
+            ]
+          ]
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+          "INSTANCE", 
+          "A", 
+          [
+            "bla", 
+            "B"
+          ], 
+          [
+            "blb", 
+            "B"
+          ]
+        ]
+      }, 
+      "line": 14, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/one_func.golden b/PyTutorGAE/tests/backend-tests/one_func.golden
new file mode 100644
index 000000000..fc82f73f5
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/one_func.golden
@@ -0,0 +1,350 @@
+{
+  "code": "def add(a, b, c):\n  d = a + b\n  return c + d\n\nx = 5\ny = 10\nz = x * y\nprint add(x, y, z)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "add": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ], 
+        "z": 50
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "add", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "a": 5, 
+            "c": 50, 
+            "b": 10
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "add", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "add_f1", 
+          "ordered_varnames": [
+            "a", 
+            "b", 
+            "c"
+          ]
+        }
+      ], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ], 
+        "z": 50
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "add", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "a": 5, 
+            "c": 50, 
+            "b": 10
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "add", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "add_f1", 
+          "ordered_varnames": [
+            "a", 
+            "b", 
+            "c"
+          ]
+        }
+      ], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ], 
+        "z": 50
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "add", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "a": 5, 
+            "c": 50, 
+            "b": 10, 
+            "d": 15
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "add", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "add_f1", 
+          "ordered_varnames": [
+            "a", 
+            "b", 
+            "c", 
+            "d"
+          ]
+        }
+      ], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ], 
+        "z": 50
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "add", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "a": 5, 
+            "__return__": 65, 
+            "c": 50, 
+            "b": 10, 
+            "d": 15
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "add", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "add_f1", 
+          "ordered_varnames": [
+            "a", 
+            "b", 
+            "c", 
+            "d", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ], 
+        "z": 50
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "65\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ], 
+        "z": 50
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 8, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/open_error.golden b/PyTutorGAE/tests/backend-tests/open_error.golden
new file mode 100644
index 000000000..768b56878
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/open_error.golden
@@ -0,0 +1,1233 @@
+{
+  "code": "for line in open(\"/etc/passwd\"):\n    print line\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "line"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "line": "root:x:0:0:root:/root:/bin/bash\n"
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "line"
+      ], 
+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "line": "root:x:0:0:root:/root:/bin/bash\n"
+      }, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "line"
+      ], 
+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "line": "daemon:x:1:1:daemon:/usr/sbin:/bin/sh\n"
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "line"
+      ], 
+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "line": "daemon:x:1:1:daemon:/usr/sbin:/bin/sh\n"
+      }, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
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+    {
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+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\n", 
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+      "line": 1, 
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+    {
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+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\n", 
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+      "stack_to_render": [], 
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+      "line": 2, 
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+    {
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+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\n", 
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+      "line": 1, 
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+    {
+      "ordered_globals": [
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+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\n", 
+      "func_name": "", 
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+      "event": "step_line"
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+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\n", 
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+      "line": 1, 
+      "event": "step_line"
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+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
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+      "heap": {}, 
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+      "line": 1, 
+      "event": "step_line"
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+    {
+      "ordered_globals": [
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+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\n", 
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+      "stack_to_render": [], 
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+      "line": 2, 
+      "event": "step_line"
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+    {
+      "ordered_globals": [
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+      "line": 1, 
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+    {
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+      "stack_to_render": [], 
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+      "line": 2, 
+      "event": "step_line"
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+      "ordered_globals": [
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+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\n", 
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+      "line": 1, 
+      "event": "step_line"
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+      "ordered_globals": [
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+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
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+        "line"
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+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "line": "statd:x:118:65534::/var/lib/nfs:/bin/false\n"
+      }, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "line"
+      ], 
+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "line": "sshd:x:119:65534::/var/run/sshd:/bin/false\n"
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "line"
+      ], 
+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "line": "sshd:x:119:65534::/var/run/sshd:/bin/false\n"
+      }, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "line"
+      ], 
+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "line": "tss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n"
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "line"
+      ], 
+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "line": "tss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n"
+      }, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "line"
+      ], 
+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "line": "distccd:x:120:65534::/:/bin/false\n"
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "line"
+      ], 
+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\ndistccd:x:120:65534::/:/bin/false\n\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "line": "distccd:x:120:65534::/:/bin/false\n"
+      }, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "line"
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+      "stack_to_render": [], 
+      "globals": {
+        "line": "x20:x:903:65534::/nonexistent:/bin/false\n"
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+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "line"
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+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\ndistccd:x:120:65534::/:/bin/false\n\nx20:x:903:65534::/nonexistent:/bin/false\n\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "line": "x20:x:903:65534::/nonexistent:/bin/false\n"
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+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "line"
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+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\ndistccd:x:120:65534::/:/bin/false\n\nx20:x:903:65534::/nonexistent:/bin/false\n\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "line": "objfs:x:904:65534::/usr/local/google/objfs:/bin/sh\n"
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "line"
+      ], 
+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\ndistccd:x:120:65534::/:/bin/false\n\nx20:x:903:65534::/nonexistent:/bin/false\n\nobjfs:x:904:65534::/usr/local/google/objfs:/bin/sh\n\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "line": "objfs:x:904:65534::/usr/local/google/objfs:/bin/sh\n"
+      }, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "line"
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+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\ndistccd:x:120:65534::/:/bin/false\n\nx20:x:903:65534::/nonexistent:/bin/false\n\nobjfs:x:904:65534::/usr/local/google/objfs:/bin/sh\n\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "line": "srcfs:x:905:65534::/nonexistent:/bin/false\n"
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+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
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+    {
+      "ordered_globals": [
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+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\ndistccd:x:120:65534::/:/bin/false\n\nx20:x:903:65534::/nonexistent:/bin/false\n\nobjfs:x:904:65534::/usr/local/google/objfs:/bin/sh\n\nsrcfs:x:905:65534::/nonexistent:/bin/false\n\n", 
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+      "stack_to_render": [], 
+      "globals": {
+        "line": "srcfs:x:905:65534::/nonexistent:/bin/false\n"
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+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
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+    {
+      "ordered_globals": [
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+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\ndistccd:x:120:65534::/:/bin/false\n\nx20:x:903:65534::/nonexistent:/bin/false\n\nobjfs:x:904:65534::/usr/local/google/objfs:/bin/sh\n\nsrcfs:x:905:65534::/nonexistent:/bin/false\n\n", 
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+      "stack_to_render": [], 
+      "globals": {
+        "line": "crudd:x:906:65534::/nonexistent:/bin/false\n"
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "line"
+      ], 
+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\ndistccd:x:120:65534::/:/bin/false\n\nx20:x:903:65534::/nonexistent:/bin/false\n\nobjfs:x:904:65534::/usr/local/google/objfs:/bin/sh\n\nsrcfs:x:905:65534::/nonexistent:/bin/false\n\ncrudd:x:906:65534::/nonexistent:/bin/false\n\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "line": "crudd:x:906:65534::/nonexistent:/bin/false\n"
+      }, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "line"
+      ], 
+      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\ndistccd:x:120:65534::/:/bin/false\n\nx20:x:903:65534::/nonexistent:/bin/false\n\nobjfs:x:904:65534::/usr/local/google/objfs:/bin/sh\n\nsrcfs:x:905:65534::/nonexistent:/bin/false\n\ncrudd:x:906:65534::/nonexistent:/bin/false\n\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "line": "crudd:x:906:65534::/nonexistent:/bin/false\n"
+      }, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/parse_error.golden b/PyTutorGAE/tests/backend-tests/parse_error.golden
new file mode 100644
index 000000000..d16836a2c
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/parse_error.golden
@@ -0,0 +1,11 @@
+{
+  "code": "x = 0\nfor i in range(10):\n  x += 1\n   print x\n  x += 1\n\n", 
+  "trace": [
+    {
+      "exception_msg": "Error: unexpected indent", 
+      "line": 4, 
+      "event": "uncaught_exception", 
+      "offset": 3
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/parse_error_2.golden b/PyTutorGAE/tests/backend-tests/parse_error_2.golden
new file mode 100644
index 000000000..52ebc60a5
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/parse_error_2.golden
@@ -0,0 +1,11 @@
+{
+  "code": "x = 5\ny = x\nz = x + y\n\nfor x haslk;fjlasfhlkjl;sa\n", 
+  "trace": [
+    {
+      "exception_msg": "Error: invalid syntax", 
+      "line": 5, 
+      "event": "uncaught_exception", 
+      "offset": 11
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/parse_error_3.golden b/PyTutorGAE/tests/backend-tests/parse_error_3.golden
new file mode 100644
index 000000000..cc161e2b7
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/parse_error_3.golden
@@ -0,0 +1,11 @@
+{
+  "code": "x = []\nfor i in range(10):\n    x.append(i)\n    if i == 24:\n        pass\n   print y\n", 
+  "trace": [
+    {
+      "exception_msg": "Error: unindent does not match any outer indentation level", 
+      "line": 6, 
+      "event": "uncaught_exception", 
+      "offset": 11
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/print_builtins_error.golden b/PyTutorGAE/tests/backend-tests/print_builtins_error.golden
new file mode 100644
index 000000000..dc24fd227
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/print_builtins_error.golden
@@ -0,0 +1,19 @@
+{
+  "code": "print __builtins__\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "exception_msg": "Unknown error", 
+      "event": "uncaught_exception"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/runtime_error.golden b/PyTutorGAE/tests/backend-tests/runtime_error.golden
new file mode 100644
index 000000000..59761ea5d
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/runtime_error.golden
@@ -0,0 +1,440 @@
+{
+  "code": "x = 5\nfor i in range(10):\n  if i == x:\n    z = x + y # ERROR!\n  else:\n    z = i\n  print z\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": 5
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 0, 
+        "x": 5
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 0, 
+        "x": 5
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 0, 
+        "x": 5, 
+        "z": 0
+      }, 
+      "heap": {}, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 0, 
+        "x": 5, 
+        "z": 0
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "x": 5, 
+        "z": 0
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "x": 5, 
+        "z": 0
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "x": 5, 
+        "z": 1
+      }, 
+      "heap": {}, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "x": 5, 
+        "z": 1
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": 5, 
+        "z": 1
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": 5, 
+        "z": 1
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": 5, 
+        "z": 2
+      }, 
+      "heap": {}, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": 5, 
+        "z": 2
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 3, 
+        "x": 5, 
+        "z": 2
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 3, 
+        "x": 5, 
+        "z": 2
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 3, 
+        "x": 5, 
+        "z": 3
+      }, 
+      "heap": {}, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 3, 
+        "x": 5, 
+        "z": 3
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 4, 
+        "x": 5, 
+        "z": 3
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 4, 
+        "x": 5, 
+        "z": 3
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 4, 
+        "x": 5, 
+        "z": 4
+      }, 
+      "heap": {}, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n3\n4\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 4, 
+        "x": 5, 
+        "z": 4
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n3\n4\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 5, 
+        "x": 5, 
+        "z": 4
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n3\n4\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 5, 
+        "x": 5, 
+        "z": 4
+      }, 
+      "heap": {}, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n3\n4\n", 
+      "exception_msg": "NameError: name 'y' is not defined", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 5, 
+        "x": 5, 
+        "z": 4
+      }, 
+      "heap": {}, 
+      "line": 4, 
+      "event": "exception"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/set_test.golden b/PyTutorGAE/tests/backend-tests/set_test.golden
new file mode 100644
index 000000000..bf39a5207
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/set_test.golden
@@ -0,0 +1,151 @@
+{
+  "code": "x = set()\nx.add('a')\nx.add('a')\nx.add('b')\nx.add('c')\nx.add('b')\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "SET"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "SET", 
+          "a"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "SET", 
+          "a"
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "SET", 
+          "a", 
+          "b"
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "SET", 
+          "a", 
+          "c", 
+          "b"
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "SET", 
+          "a", 
+          "c", 
+          "b"
+        ]
+      }, 
+      "line": 6, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/simple.golden b/PyTutorGAE/tests/backend-tests/simple.golden
new file mode 100644
index 000000000..2fc4b4ab8
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/simple.golden
@@ -0,0 +1,501 @@
+{
+  "code": "x = 5\ny = 10\nz = x * y\nprint \"HELLO WORLD\"\nfor i in range(10):\n  print z * i\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": 5
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": 10, 
+        "x": 5
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "z": 50
+      }, 
+      "heap": {}, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "HELLO WORLD\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "z": 50
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 0, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 0, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 3, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 3, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 4, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 4, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 5, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 5, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 6, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n300\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 6, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n300\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 7, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n300\n350\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 7, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n300\n350\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 8, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n300\n350\n400\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 8, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n300\n350\n400\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 9, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n300\n350\n400\n450\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 9, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n300\n350\n400\n450\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 9, 
+        "y": 10, 
+        "z": 50, 
+        "x": 5
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/three_lists.golden b/PyTutorGAE/tests/backend-tests/three_lists.golden
new file mode 100644
index 000000000..27775034e
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/three_lists.golden
@@ -0,0 +1,632 @@
+{
+  "code": "# test case submitted by Peter Wentworth (p.wentworth@ru.ac.za)\n\ndef f(xs):\n    print(xs)\n\na = [10, 20, 30]\nb = a\nc = [10, 20, 30]\nd = 24\ne = (a, b, c)\n\nf(b)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(xs)", 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f", 
+        "a"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          2
+        ], 
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f", 
+        "a", 
+        "b"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          2
+        ], 
+        "b": [
+          "REF", 
+          2
+        ], 
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f", 
+        "a", 
+        "b", 
+        "c"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          2
+        ], 
+        "c": [
+          "REF", 
+          3
+        ], 
+        "b": [
+          "REF", 
+          2
+        ], 
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ], 
+        "3": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f", 
+        "a", 
+        "b", 
+        "c", 
+        "d"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          2
+        ], 
+        "c": [
+          "REF", 
+          3
+        ], 
+        "b": [
+          "REF", 
+          2
+        ], 
+        "d": 24, 
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ], 
+        "3": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f", 
+        "a", 
+        "b", 
+        "c", 
+        "d", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          2
+        ], 
+        "c": [
+          "REF", 
+          3
+        ], 
+        "b": [
+          "REF", 
+          2
+        ], 
+        "e": [
+          "REF", 
+          4
+        ], 
+        "d": 24, 
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ], 
+        "3": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ]
+        ]
+      }, 
+      "line": 12, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f", 
+        "a", 
+        "b", 
+        "c", 
+        "d", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "xs"
+          ]
+        }
+      ], 
+      "globals": {
+        "a": [
+          "REF", 
+          2
+        ], 
+        "c": [
+          "REF", 
+          3
+        ], 
+        "b": [
+          "REF", 
+          2
+        ], 
+        "e": [
+          "REF", 
+          4
+        ], 
+        "d": 24, 
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ], 
+        "3": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ]
+        ]
+      }, 
+      "line": 3, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "f", 
+        "a", 
+        "b", 
+        "c", 
+        "d", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
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+}
diff --git a/PyTutorGAE/tests/backend-tests/tuple_test.golden b/PyTutorGAE/tests/backend-tests/tuple_test.golden
new file mode 100644
index 000000000..f1c5b4fc3
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/tuple_test.golden
@@ -0,0 +1,72 @@
+{
+  "code": "x = (1, 2, 3)\ny = (4,)\n\n", 
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+}
diff --git a/PyTutorGAE/tests/backend-tests/two_funcs.golden b/PyTutorGAE/tests/backend-tests/two_funcs.golden
new file mode 100644
index 000000000..9d15f9734
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/two_funcs.golden
@@ -0,0 +1,1453 @@
+{
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+        ]
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+          null
+        ]
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+      "line": 3, 
+      "event": "return"
+    }, 
+    {
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+        "add", 
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+      "func_name": "double_add", 
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+          "parent_frame_id_list": [], 
+          "unique_hash": "double_add_f2", 
+          "ordered_varnames": [
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+            "b", 
+            "c", 
+            "x"
+          ]
+        }
+      ], 
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+        "z": 50, 
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+          2
+        ]
+      }, 
+      "heap": {
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+          "add(a, b, c)", 
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+          "double_add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "double_add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "65\n", 
+      "func_name": "add", 
+      "stack_to_render": [
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
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+            "b": 10
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+          "func_name": "double_add", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "double_add_f2", 
+          "ordered_varnames": [
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+            "c", 
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+          "unique_hash": "add_f4", 
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+            "a", 
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+            "c"
+          ]
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+      ], 
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+        ], 
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+          2
+        ]
+      }, 
+      "heap": {
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+          null
+        ], 
+        "2": [
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+          "double_add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
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+        "double_add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "65\n", 
+      "func_name": "add", 
+      "stack_to_render": [
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+          "is_parent": false, 
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+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "double_add_f2", 
+          "ordered_varnames": [
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+            "b", 
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+          ]
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+          "parent_frame_id_list": [], 
+          "unique_hash": "add_f4", 
+          "ordered_varnames": [
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+            "c"
+          ]
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+        "z": 50, 
+        "double_add": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
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+          "add(a, b, c)", 
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+        ], 
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+          "double_add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "double_add", 
+        "x", 
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+        "z"
+      ], 
+      "stdout": "65\n", 
+      "func_name": "add", 
+      "stack_to_render": [
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+          "frame_id": 2, 
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+          "func_name": "double_add", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "double_add_f2", 
+          "ordered_varnames": [
+            "a", 
+            "b", 
+            "c", 
+            "x"
+          ]
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+        {
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+          "encoded_locals": {
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+          }, 
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+          "is_parent": false, 
+          "func_name": "add", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "add_f4", 
+          "ordered_varnames": [
+            "a", 
+            "b", 
+            "c", 
+            "d"
+          ]
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+        ], 
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+          2
+        ]
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+          null
+        ], 
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+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "double_add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "65\n", 
+      "func_name": "add", 
+      "stack_to_render": [
+        {
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+          "encoded_locals": {
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+          }, 
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+          "func_name": "double_add", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "double_add_f2", 
+          "ordered_varnames": [
+            "a", 
+            "b", 
+            "c", 
+            "x"
+          ]
+        }, 
+        {
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+          "encoded_locals": {
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+          "func_name": "add", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "add_f4", 
+          "ordered_varnames": [
+            "a", 
+            "b", 
+            "c", 
+            "d", 
+            "__return__"
+          ]
+        }
+      ], 
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+          1
+        ], 
+        "z": 50, 
+        "double_add": [
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+          2
+        ]
+      }, 
+      "heap": {
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+          "add(a, b, c)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "double_add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "double_add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "65\n", 
+      "func_name": "double_add", 
+      "stack_to_render": [
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "a": 5, 
+            "x": 65, 
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+            "y": 65
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "double_add", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "double_add_f2", 
+          "ordered_varnames": [
+            "a", 
+            "b", 
+            "c", 
+            "x", 
+            "y"
+          ]
+        }
+      ], 
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+        "y": 10, 
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ], 
+        "z": 50, 
+        "double_add": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "double_add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "double_add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "65\n", 
+      "func_name": "double_add", 
+      "stack_to_render": [
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "a": 5, 
+            "c": 50, 
+            "b": 10, 
+            "__return__": 130, 
+            "y": 65, 
+            "x": 65
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "double_add", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "double_add_f2", 
+          "ordered_varnames": [
+            "a", 
+            "b", 
+            "c", 
+            "x", 
+            "y", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ], 
+        "z": 50, 
+        "double_add": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "double_add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 8, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "double_add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "65\n130\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ], 
+        "z": 50, 
+        "double_add": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "double_add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 14, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/golden_test.py b/PyTutorGAE/tests/golden_test.py
index ad4563c57..9149c5d84 100644
--- a/PyTutorGAE/tests/golden_test.py
+++ b/PyTutorGAE/tests/golden_test.py
@@ -2,17 +2,18 @@
 A simple framework for regression testing based on golden files
 by Philip Guo
 
-customized for the Online Python Tutor project
+(sloppily) customized for the Online Python Tutor project
 '''
 
-import os, shutil, optparse, difflib
+import os, re, shutil, optparse, difflib
 from subprocess import *
 
 
-PROGRAM = 'python'
+PROGRAM = ['python', '../generate_json_trace.py']
 
 INPUT_FILE_EXTENSION = '.txt' # input test files are .txt, NOT .py
-OUTPUT_FILE = 'out.trace'
+
+TEST_DIR = '.'
 
 
 ALL_TESTS = []
@@ -34,16 +35,22 @@ def execute(input_filename):
   (base, ext) = os.path.splitext(input_filename)
   assert ext == INPUT_FILE_EXTENSION
 
-  (stdout, stderr) = Popen([PROGRAM, input_filename], stdout=PIPE, stderr=PIPE).  communicate()
+  (stdout, stderr) = Popen(PROGRAM + [input_filename], stdout=PIPE, stderr=PIPE).communicate()
 
   if stderr:
-    print '  CONTAINS ERROR'
-    #print '{'
-    #print stderr, '}'
+    print '  (has stderr)'
+  #  print '  stderr {'
+  #  print stderr, '}'
 
-  assert os.path.isfile(OUTPUT_FILE)
+  # capture stdout into outfile, filtering out machine-specific addresses
   outfile = base + '.out'
-  os.rename(OUTPUT_FILE, outfile)
+  outf = open(outfile, 'w')
+
+  for line in stdout.splitlines():
+    filtered_line = re.sub(' 0x.+?>', ' 0xADDR>', line)
+    print >> outf, filtered_line
+
+  outf.close()
 
 
 def clobber_golden_file(golden_file):
diff --git a/example-code/aliasing.golden b/example-code/aliasing.golden
new file mode 100644
index 000000000..f674bbff3
--- /dev/null
+++ b/example-code/aliasing.golden
@@ -0,0 +1,2067 @@
+{
+  "code": "x = [1, 2, 3]\ny = [4, 5, 6]\nz = y\ny = x\nx = z\n\nx = [1, 2, 3] # a different [1, 2, 3] list!\ny = x\nx.append(4)\ny.append(5)\nz = [1, 2, 3, 4, 5] # a different list!\nx.append(6)\ny.append(7)\ny = \"hello\"\n\n\ndef foo(lst):\n    lst.append(\"hello\")\n    bar(lst)\n\ndef bar(myLst):\n    print myLst\n\nfoo(x)\nfoo(z)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2, 
+          3
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          2
+        ], 
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2, 
+          3
+        ], 
+        "2": [
+          "LIST", 
+          4, 
+          5, 
+          6
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          2
+        ], 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "z": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2, 
+          3
+        ], 
+        "2": [
+          "LIST", 
+          4, 
+          5, 
+          6
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
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diff --git a/example-code/aliasing/aliasing1.golden b/example-code/aliasing/aliasing1.golden
new file mode 100644
index 000000000..00383dd48
--- /dev/null
+++ b/example-code/aliasing/aliasing1.golden
@@ -0,0 +1,98 @@
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diff --git a/example-code/aliasing/aliasing2.golden b/example-code/aliasing/aliasing2.golden
new file mode 100644
index 000000000..ab6c203f4
--- /dev/null
+++ b/example-code/aliasing/aliasing2.golden
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diff --git a/example-code/aliasing/aliasing3.golden b/example-code/aliasing/aliasing3.golden
new file mode 100644
index 000000000..a0bded930
--- /dev/null
+++ b/example-code/aliasing/aliasing3.golden
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+}
diff --git a/example-code/aliasing/aliasing4.golden b/example-code/aliasing/aliasing4.golden
new file mode 100644
index 000000000..0d440f81a
--- /dev/null
+++ b/example-code/aliasing/aliasing4.golden
@@ -0,0 +1,67 @@
+{
+  "code": "x = [1, 2, 3]\nx.append(x)\n", 
+  "trace": [
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+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
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+}
diff --git a/example-code/aliasing/aliasing5.golden b/example-code/aliasing/aliasing5.golden
new file mode 100644
index 000000000..af82d0118
--- /dev/null
+++ b/example-code/aliasing/aliasing5.golden
@@ -0,0 +1,455 @@
+{
+  "code": "x = None\nfor i in range(5, 0, -1):\n  x = (i, x)\n", 
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+}
diff --git a/example-code/aliasing/aliasing6.golden b/example-code/aliasing/aliasing6.golden
new file mode 100644
index 000000000..71b2ac9b6
--- /dev/null
+++ b/example-code/aliasing/aliasing6.golden
@@ -0,0 +1,327 @@
+{
+  "code": "# wow, this looks gross :)\nt1 = (1, 2)\nt2 = (3, 4)\nt = [t1, t2]\nu = [t, t, t]\nu[1] = u\nt[0] = u\n", 
+  "trace": [
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+      "func_name": "", 
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+      "heap": {
+        "1": [
+          "TUPLE", 
+          1, 
+          2
+        ], 
+        "2": [
+          "TUPLE", 
+          3, 
+          4
+        ], 
+        "3": [
+          "LIST", 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "4": [
+          "LIST", 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            3
+          ]
+        ]
+      }, 
+      "line": 7, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/example-code/aliasing/aliasing7.golden b/example-code/aliasing/aliasing7.golden
new file mode 100644
index 000000000..fc49379b4
--- /dev/null
+++ b/example-code/aliasing/aliasing7.golden
@@ -0,0 +1,248 @@
+{
+  "code": "x = (3, {'joe': 'M', 'jane': 'F'})\ny = (2, x)\nz = (1, y)\nw = (x, y, z)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "TUPLE", 
+          3, 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "jane", 
+            "F"
+          ], 
+          [
+            "joe", 
+            "M"
+          ]
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          3
+        ], 
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "TUPLE", 
+          3, 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "jane", 
+            "F"
+          ], 
+          [
+            "joe", 
+            "M"
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            1
+          ]
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          3
+        ], 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "z": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "TUPLE", 
+          3, 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "jane", 
+            "F"
+          ], 
+          [
+            "joe", 
+            "M"
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            1
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            3
+          ]
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "w"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          3
+        ], 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "z": [
+          "REF", 
+          4
+        ], 
+        "w": [
+          "REF", 
+          5
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "TUPLE", 
+          3, 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "jane", 
+            "F"
+          ], 
+          [
+            "joe", 
+            "M"
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            1
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "5": [
+          "TUPLE", 
+          [
+            "REF", 
+            1
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ]
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/example-code/aliasing/aliasing8.golden b/example-code/aliasing/aliasing8.golden
new file mode 100644
index 000000000..20ddeb5fb
--- /dev/null
+++ b/example-code/aliasing/aliasing8.golden
@@ -0,0 +1,229 @@
+{
+  "code": "# test whether heap objects \"jiggle\" between steps\nx = [1, [2, [3, None]]]\ny = [4, [5, [6, None]]]\n\nx[1][1] = y[1] # hopefully no jiggle!\n\nx = set(['apple', 'banana', 'carrot'])\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          2, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "3": [
+          "LIST", 
+          3, 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          4
+        ], 
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          2, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "3": [
+          "LIST", 
+          3, 
+          null
+        ], 
+        "4": [
+          "LIST", 
+          4, 
+          [
+            "REF", 
+            5
+          ]
+        ], 
+        "5": [
+          "LIST", 
+          5, 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "6": [
+          "LIST", 
+          6, 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          4
+        ], 
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          2, 
+          [
+            "REF", 
+            5
+          ]
+        ], 
+        "4": [
+          "LIST", 
+          4, 
+          [
+            "REF", 
+            5
+          ]
+        ], 
+        "5": [
+          "LIST", 
+          5, 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "6": [
+          "LIST", 
+          6, 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          4
+        ], 
+        "x": [
+          "REF", 
+          7
+        ]
+      }, 
+      "heap": {
+        "4": [
+          "LIST", 
+          4, 
+          [
+            "REF", 
+            5
+          ]
+        ], 
+        "5": [
+          "LIST", 
+          5, 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "6": [
+          "LIST", 
+          6, 
+          null
+        ], 
+        "7": [
+          "SET", 
+          "carrot", 
+          "apple", 
+          "banana"
+        ]
+      }, 
+      "line": 7, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/example-code/closures/closure1.golden b/example-code/closures/closure1.golden
new file mode 100644
index 000000000..3652e7a3f
--- /dev/null
+++ b/example-code/closures/closure1.golden
@@ -0,0 +1,567 @@
+{
+  "code": "def foo(y):\n def bar(x):\n   return x + y\n return bar\n\nb = foo(1)\nb(2)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1, 
+            "bar": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1_p", 
+          "ordered_varnames": [
+            "y", 
+            "bar"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "bar(x)", 
+          1
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1, 
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "bar": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1_p", 
+          "ordered_varnames": [
+            "y", 
+            "bar", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "bar(x)", 
+          1
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "foo", 
+        "b"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1, 
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "bar": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "foo", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1_p_z", 
+          "ordered_varnames": [
+            "y", 
+            "bar", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ], 
+        "b": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "bar(x)", 
+          1
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo", 
+        "b"
+      ], 
+      "stdout": "", 
+      "func_name": "bar", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1, 
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "bar": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "foo", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1_p_z", 
+          "ordered_varnames": [
+            "y", 
+            "bar", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 2
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "bar", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "bar_f2", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ], 
+        "b": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "bar(x)", 
+          1
+        ]
+      }, 
+      "line": 2, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "foo", 
+        "b"
+      ], 
+      "stdout": "", 
+      "func_name": "bar", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1, 
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "bar": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "foo", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1_p_z", 
+          "ordered_varnames": [
+            "y", 
+            "bar", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 2
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "bar", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "bar_f2", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ], 
+        "b": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "bar(x)", 
+          1
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo", 
+        "b"
+      ], 
+      "stdout": "", 
+      "func_name": "bar", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1, 
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "bar": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "foo", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1_p_z", 
+          "ordered_varnames": [
+            "y", 
+            "bar", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": 3, 
+            "x": 2
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "bar", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "bar_f2", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ], 
+        "b": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "bar(x)", 
+          1
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "foo", 
+        "b"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1, 
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "bar": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "foo", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
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+      "event": "return"
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+}
diff --git a/example-code/closures/closure2.golden b/example-code/closures/closure2.golden
new file mode 100644
index 000000000..e7a544a04
--- /dev/null
+++ b/example-code/closures/closure2.golden
@@ -0,0 +1,1764 @@
+{
+  "code": "def foo(y):\n  def bar(x):\n    return x + y\n  return bar\n\ndef foo_deux(y):\n  def bar_deux(x):\n    return x + y\n  return bar_deux\n\nb = foo(1)\nb_deux = foo_deux(1000)\n\nb(2)    \nb_deux(2000)\n", 
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+      "event": "return"
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+      "line": 15, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/example-code/closures/closure3.golden b/example-code/closures/closure3.golden
new file mode 100644
index 000000000..fe2310a1a
--- /dev/null
+++ b/example-code/closures/closure3.golden
@@ -0,0 +1,1400 @@
+{
+  "code": "def foo(x):\n def bar(y):\n   def baz(z):\n     return len(x) + len(y) + len(z)\n   return baz\n return bar([4,5,6,7])\n\nl = [1,2,3]\nx = foo(l)\nx([8,9,10,11,12])\n", 
+  "trace": [
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+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
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+      "event": "step_line"
+    }, 
+    {
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+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
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+          1
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+      "heap": {
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+          "FUNCTION", 
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+      }, 
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+      "event": "step_line"
+    }, 
+    {
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+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
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+        ]
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+        ], 
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+          2, 
+          3
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
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+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
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+            ]
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+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
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+          3
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
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+      ], 
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+      "func_name": "foo", 
+      "stack_to_render": [
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+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
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+        ], 
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+          2
+        ]
+      }, 
+      "heap": {
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+          "FUNCTION", 
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+          null
+        ], 
+        "2": [
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+          1, 
+          2, 
+          3
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo", 
+        "l"
+      ], 
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diff --git a/example-code/closures/closure4.golden b/example-code/closures/closure4.golden
new file mode 100644
index 000000000..914a59b4e
--- /dev/null
+++ b/example-code/closures/closure4.golden
@@ -0,0 +1,1457 @@
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diff --git a/example-code/closures/closure5.golden b/example-code/closures/closure5.golden
new file mode 100644
index 000000000..95ed6ae75
--- /dev/null
+++ b/example-code/closures/closure5.golden
@@ -0,0 +1,7684 @@
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+}
diff --git a/example-code/closures/lambda-param.golden b/example-code/closures/lambda-param.golden
new file mode 100644
index 000000000..57c68cc3e
--- /dev/null
+++ b/example-code/closures/lambda-param.golden
@@ -0,0 +1,797 @@
+{
+  "code": "def foo(x):\n  bar(lambda y: x + y)\n\ndef bar(a):\n  print a(20)\n\nfoo(10)\n", 
+  "trace": [
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+      "func_name": "foo", 
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+      "event": "step_line"
+    }, 
+    {
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+        "bar"
+      ], 
+      "stdout": "", 
+      "func_name": "bar", 
+      "stack_to_render": [
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+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 10
+          }, 
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+      "func_name": "bar", 
+      "stack_to_render": [
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diff --git a/example-code/fact.golden b/example-code/fact.golden
new file mode 100644
index 000000000..1df6def65
--- /dev/null
+++ b/example-code/fact.golden
@@ -0,0 +1,1909 @@
+{
+  "code": "# dumb recursive factorial\ndef fact(n):\n    if (n <= 1):\n        return 1\n    else:\n        return n * fact(n - 1)\n\nprint fact(6)\n", 
+  "trace": [
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+}
diff --git a/example-code/fib.golden b/example-code/fib.golden
new file mode 100644
index 000000000..5533695de
--- /dev/null
+++ b/example-code/fib.golden
@@ -0,0 +1,7545 @@
+{
+  "code": "# Infinite Fibonacci!!!\n\narr = [1, 1]\n\nprint arr[0]\n\nwhile True:\n    print arr[-1]\n    tmp = sum(arr)\n    arr.append(tmp)\n    del arr[0]\n", 
+  "trace": [
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+      "stdout": "1\n", 
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+      "stdout": "1\n1\n", 
+      "func_name": "", 
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+      "func_name": "", 
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+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1548008755920, 
+          2504730781961
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "exception_msg": "(stopped after 300 steps to prevent possible infinite loop)", 
+      "event": "instruction_limit_reached"
+    }
+  ]
+}
diff --git a/example-code/filter.golden b/example-code/filter.golden
new file mode 100644
index 000000000..e189a782e
--- /dev/null
+++ b/example-code/filter.golden
@@ -0,0 +1,1505 @@
+{
+  "code": "input = [(\"Mary\", 27), (\"Joe\", 30), (\"Ruth\", 43), (\"Bob\", 17), (\"Jenny\", 22)]\n\nyoungPeople = []\n\nfor (person, age) in input:\n    if age < 30:\n        youngPeople.append(person)\n    else:\n        print \"HAHA\", person, \"is too old!\"\n\nprint \"There are\", len(youngPeople), \"young people\"\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "input": [
+          "REF", 
+          1
+        ], 
+        "youngPeople": [
+          "REF", 
+          7
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST"
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Mary", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 27, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST"
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Mary", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 27, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST"
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Mary", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 27, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST", 
+          "Mary"
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Joe", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 30, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST", 
+          "Mary"
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Joe", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 30, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST", 
+          "Mary"
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "HAHA Joe is too old!\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Joe", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 30, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST", 
+          "Mary"
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "HAHA Joe is too old!\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Ruth", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 43, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST", 
+          "Mary"
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "HAHA Joe is too old!\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Ruth", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 43, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST", 
+          "Mary"
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "HAHA Joe is too old!\nHAHA Ruth is too old!\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Ruth", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 43, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST", 
+          "Mary"
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "HAHA Joe is too old!\nHAHA Ruth is too old!\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Bob", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 17, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST", 
+          "Mary"
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "HAHA Joe is too old!\nHAHA Ruth is too old!\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Bob", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 17, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST", 
+          "Mary"
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "HAHA Joe is too old!\nHAHA Ruth is too old!\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Bob", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 17, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST", 
+          "Mary", 
+          "Bob"
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "HAHA Joe is too old!\nHAHA Ruth is too old!\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Jenny", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 22, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
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+          "TUPLE", 
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+    }, 
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+      ], 
+      "stdout": "HAHA Joe is too old!\nHAHA Ruth is too old!\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Jenny", 
+        "youngPeople": [
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+      "func_name": "", 
+      "stack_to_render": [], 
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+      "func_name": "", 
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+      "line": 11, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/example-code/ins_sort.golden b/example-code/ins_sort.golden
new file mode 100644
index 000000000..a7f4751dd
--- /dev/null
+++ b/example-code/ins_sort.golden
@@ -0,0 +1,3538 @@
+{
+  "code": "# from: http://www.ece.uci.edu/~chou/py02/python.html\ndef InsertionSort(A):\n    for j in range(1, len(A)):\n        key = A[j]\n        i = j - 1\n        while (i >= 0) and (A[i] > key):\n            A[i+1] = A[i]\n            i = i - 1\n        A[i+1] = key\n\ninput = [8, 3, 9, 15, 29, 7, 10]\nInsertionSort(input)\nprint input\n", 
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+}
diff --git a/example-code/linked-lists/ll1.golden b/example-code/linked-lists/ll1.golden
new file mode 100644
index 000000000..1da0bbfb2
--- /dev/null
+++ b/example-code/linked-lists/ll1.golden
@@ -0,0 +1,1977 @@
+{
+  "code": "# use lists\nx = None\nfor i in range(6, 0, -1):\n  x = [i, x]\n\n# use tuples\ny = None\nfor i in range(6, 0, -1):\n  y = (i, y)\n\nx[1][0]=y[1][1] # courtesy of John DeNero!\n\n", 
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diff --git a/example-code/linked-lists/ll2.golden b/example-code/linked-lists/ll2.golden
new file mode 100644
index 000000000..6437333ed
--- /dev/null
+++ b/example-code/linked-lists/ll2.golden
@@ -0,0 +1,10032 @@
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diff --git a/example-code/map.golden b/example-code/map.golden
new file mode 100644
index 000000000..4334221df
--- /dev/null
+++ b/example-code/map.golden
@@ -0,0 +1,6996 @@
+{
+  "code": "# Functional programming with map\n# Adapted from MIT 6.01 course notes (Section A.2.3)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\ndef map(func, lst):\n    if lst == []:\n        return []\n    else:\n        return [func(lst[0])] + map(func, lst[1:])\n    \ndef halveElements(lst):\n    return map(lambda x: x / 2.0, lst)\n  \ninput = [2, 4, 6, 8, 10]\noutput = halveElements(input)\n", 
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diff --git a/example-code/memo_fib.golden b/example-code/memo_fib.golden
new file mode 100644
index 000000000..abb03047a
--- /dev/null
+++ b/example-code/memo_fib.golden
@@ -0,0 +1,10715 @@
+{
+  "code": "# use memoization to make the recursive Fibonacci\n# implementation only take O(n) time and space\n\nMemoTable = {}\n\ndef MemoizedFib(n):\n    if n <= 2:\n        return 1\n\n    if n in MemoTable:\n        return MemoTable[n]\n\n    MemoTable[n] = MemoizedFib(n-1) + MemoizedFib(n-2)\n    return MemoTable[n]\n\n\nres = MemoizedFib(10)\n", 
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+}
diff --git a/example-code/oop_1.golden b/example-code/oop_1.golden
new file mode 100644
index 000000000..c6febe7f9
--- /dev/null
+++ b/example-code/oop_1.golden
@@ -0,0 +1,2448 @@
+{
+  "code": "# Object-oriented programming intro\n# Adapted from MIT 6.01 course notes (Section 3.5)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\nclass Staff601:\n    course = '6.01'\n    building = 34\n    room = 501\n\n    def salutation(self):\n        return self.role + ' ' + self.name\n\npat = Staff601()\nprint pat.course\n\npat.name = 'Pat'\npat.age = 60\npat.role = 'Professor'\n\nprint pat.building\npat.building = 32\nprint pat.building\n\nprint pat.salutation()\nprint Staff601.salutation(pat)\n", 
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+          ]
+        ], 
+        "4": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "building", 
+            32
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 25, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n34\n32\nProfessor Pat\n", 
+      "func_name": "salutation", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "course": "6.01", 
+            "salutation": [
+              "REF", 
+              1
+            ], 
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "room", 
+            "salutation", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "self": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "salutation", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "salutation_f3", 
+          "ordered_varnames": [
+            "self"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "pat": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "salutation(self)", 
+          1
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
+        "4": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "building", 
+            32
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 10, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n34\n32\nProfessor Pat\n", 
+      "func_name": "salutation", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "course": "6.01", 
+            "salutation": [
+              "REF", 
+              1
+            ], 
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "room", 
+            "salutation", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "self": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "salutation", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "salutation_f3", 
+          "ordered_varnames": [
+            "self"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "pat": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "salutation(self)", 
+          1
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
+        "4": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "building", 
+            32
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n34\n32\nProfessor Pat\n", 
+      "func_name": "salutation", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "course": "6.01", 
+            "salutation": [
+              "REF", 
+              1
+            ], 
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "room", 
+            "salutation", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "__return__": "Professor Pat", 
+            "self": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "salutation", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "salutation_f3", 
+          "ordered_varnames": [
+            "self", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "pat": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "salutation(self)", 
+          1
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
+        "4": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "building", 
+            32
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 11, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n34\n32\nProfessor Pat\nProfessor Pat\n", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "course": "6.01", 
+            "salutation": [
+              "REF", 
+              1
+            ], 
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "room", 
+            "salutation", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "pat": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "salutation(self)", 
+          1
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
+        "4": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "building", 
+            32
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 25, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/example-code/oop_2.golden b/example-code/oop_2.golden
new file mode 100644
index 000000000..a62b91d30
--- /dev/null
+++ b/example-code/oop_2.golden
@@ -0,0 +1,2236 @@
+{
+  "code": "# The __init__ 'constructor' - object-oriented programming intro\n# Adapted from MIT 6.01 course notes (Section 3.5)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\nclass Staff601:\n    course = '6.01'\n    building = 34\n    room = 501\n\n    def __init__(self, name, role, years, salary):\n      self.name = name\n      self.role = role\n      self.age = years\n      self.salary = salary\n\n    def salutation(self):\n        return self.role + ' ' + self.name\n\npat = Staff601('Pat', 'Professor', 60, 100000)\nprint pat.salutation()\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "course": "6.01"
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": [
+            "course"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "course": "6.01"
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": [
+            "building", 
+            "course"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "course": "6.01", 
+            "room": 501
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "room"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "course": "6.01", 
+            "room": 501, 
+            "__init__": [
+              "REF", 
+              1
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p", 
+          "ordered_varnames": [
+            "__init__", 
+            "building", 
+            "course", 
+            "room"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "__init__(self, name, role, years, salary)", 
+          1
+        ]
+      }, 
+      "line": 16, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
+            "room": 501, 
+            "course": "6.01", 
+            "salutation": [
+              "REF", 
+              2
+            ], 
+            "__init__": [
+              "REF", 
+              1
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p", 
+          "ordered_varnames": [
+            "__init__", 
+            "building", 
+            "course", 
+            "room", 
+            "salutation", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "__init__(self, name, role, years, salary)", 
+          1
+        ], 
+        "2": [
+          "FUNCTION", 
+          "salutation(self)", 
+          1
+        ], 
+        "3": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ]
+      }, 
+      "line": 16, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
+            "room": 501, 
+            "course": "6.01", 
+            "salutation": [
+              "REF", 
+              2
+            ], 
+            "__init__": [
+              "REF", 
+              1
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "__init__", 
+            "building", 
+            "course", 
+            "room", 
+            "salutation", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "__init__(self, name, role, years, salary)", 
+          1
+        ], 
+        "2": [
+          "FUNCTION", 
+          "salutation(self)", 
+          1
+        ], 
+        "3": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
+        "4": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ]
+      }, 
+      "line": 19, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601"
+      ], 
+      "stdout": "", 
+      "func_name": "__init__", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
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+      "event": "return"
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+          ], 
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+            "room", 
+            501
+          ], 
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+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
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+          "Staff601", 
+          [
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+          ], 
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+            "name", 
+            "Pat"
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+          [
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+            "Professor"
+          ], 
+          [
+            "salary", 
+            100000
+          ]
+        ]
+      }, 
+      "line": 20, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/example-code/oop_inherit.golden b/example-code/oop_inherit.golden
new file mode 100644
index 000000000..8b3640434
--- /dev/null
+++ b/example-code/oop_inherit.golden
@@ -0,0 +1,3181 @@
+{
+  "code": "# Inheritance - object-oriented programming intro\n# Adapted from MIT 6.01 course notes (Section 3.5)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\nclass Staff601:\n    course = '6.01'\n    building = 34\n    room = 501\n\n    def giveRaise(self, percentage):\n        self.salary = self.salary + self.salary * percentage\n\nclass Prof601(Staff601):\n    salary = 100000\n\n    def __init__(self, name, age):\n        self.name = name\n        self.giveRaise((age - 18) * 0.03)\n\n    def salutation(self):\n        return self.role + ' ' + self.name\n\npat = Prof601('Pat', 60)\n\n", 
+  "trace": [
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+      "stdout": "", 
+      "func_name": "", 
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+          "encoded_locals": {
+            "__return__": null, 
+            "percentage": 1.26, 
+            "self": [
+              "REF", 
+              8
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "giveRaise", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "giveRaise_f4", 
+          "ordered_varnames": [
+            "self", 
+            "percentage", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "Prof601": [
+          "REF", 
+          7
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "giveRaise(self, percentage)", 
+          1
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "4": [
+          "FUNCTION", 
+          "__init__(self, name, age)", 
+          2
+        ], 
+        "5": [
+          "FUNCTION", 
+          "salutation(self)", 
+          2
+        ], 
+        "6": [
+          "DICT", 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              4
+            ]
+          ]
+        ], 
+        "7": [
+          "CLASS", 
+          "Prof601", 
+          [
+            "Staff601"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              4
+            ]
+          ], 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ]
+        ], 
+        "8": [
+          "INSTANCE", 
+          "Prof601", 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "salary", 
+            226000.0
+          ]
+        ]
+      }, 
+      "line": 11, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "Prof601"
+      ], 
+      "stdout": "", 
+      "func_name": "__init__", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "giveRaise": [
+              "REF", 
+              1
+            ], 
+            "room": 501
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "giveRaise", 
+            "room", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "salary": 100000, 
+            "__return__": [
+              "REF", 
+              6
+            ], 
+            "salutation": [
+              "REF", 
+              5
+            ], 
+            "__init__": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Prof601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Prof601_f2_p_z", 
+          "ordered_varnames": [
+            "__init__", 
+            "salary", 
+            "salutation", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "__return__": null, 
+            "age": 60, 
+            "name": "Pat", 
+            "self": [
+              "REF", 
+              8
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "__init__", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            2
+          ], 
+          "unique_hash": "__init___f3", 
+          "ordered_varnames": [
+            "self", 
+            "name", 
+            "age", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "Prof601": [
+          "REF", 
+          7
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "giveRaise(self, percentage)", 
+          1
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "4": [
+          "FUNCTION", 
+          "__init__(self, name, age)", 
+          2
+        ], 
+        "5": [
+          "FUNCTION", 
+          "salutation(self)", 
+          2
+        ], 
+        "6": [
+          "DICT", 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              4
+            ]
+          ]
+        ], 
+        "7": [
+          "CLASS", 
+          "Prof601", 
+          [
+            "Staff601"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              4
+            ]
+          ], 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ]
+        ], 
+        "8": [
+          "INSTANCE", 
+          "Prof601", 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "salary", 
+            226000.0
+          ]
+        ]
+      }, 
+      "line": 18, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "Prof601", 
+        "pat"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "giveRaise": [
+              "REF", 
+              1
+            ], 
+            "room": 501
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "giveRaise", 
+            "room", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "salary": 100000, 
+            "__return__": [
+              "REF", 
+              6
+            ], 
+            "salutation": [
+              "REF", 
+              5
+            ], 
+            "__init__": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Prof601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Prof601_f2_p_z", 
+          "ordered_varnames": [
+            "__init__", 
+            "salary", 
+            "salutation", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "pat": [
+          "REF", 
+          8
+        ], 
+        "Prof601": [
+          "REF", 
+          7
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "giveRaise(self, percentage)", 
+          1
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "4": [
+          "FUNCTION", 
+          "__init__(self, name, age)", 
+          2
+        ], 
+        "5": [
+          "FUNCTION", 
+          "salutation(self)", 
+          2
+        ], 
+        "6": [
+          "DICT", 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              4
+            ]
+          ]
+        ], 
+        "7": [
+          "CLASS", 
+          "Prof601", 
+          [
+            "Staff601"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              4
+            ]
+          ], 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ]
+        ], 
+        "8": [
+          "INSTANCE", 
+          "Prof601", 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "salary", 
+            226000.0
+          ]
+        ]
+      }, 
+      "line": 23, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/example-code/oop_small.golden b/example-code/oop_small.golden
new file mode 100644
index 000000000..53cc18a79
--- /dev/null
+++ b/example-code/oop_small.golden
@@ -0,0 +1,2093 @@
+{
+  "code": "class A:\n    x = 1\n    y = 'hello'\n\nclass B:\n    z = 'bye'\n\nclass C(A,B):\n    def salutation(self):\n        return '%d %s %s' % (self.x, self.y, self.z)\n\ninst = C()\nprint inst.salutation()\ninst.x = 100\nprint inst.salutation()\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "A", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "A", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "A_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "A", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "A", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "A_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "A", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "A", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "A_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "A", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "A", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "A_f1", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "A", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": "hello", 
+            "x": 1, 
+            "__return__": [
+              "REF", 
+              1
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "A", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "A_f1", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "y", 
+            "hello"
+          ], 
+          [
+            "x", 
+            1
+          ]
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "A"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "A": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "A", 
+          [], 
+          [
+            "x", 
+            1
+          ], 
+          [
+            "y", 
+            "hello"
+          ]
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "A"
+      ], 
+      "stdout": "", 
+      "func_name": "B", 
+      "stack_to_render": [
+        {
+          "frame_id": 2, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "B", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "B_f2", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "A": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "A", 
+          [], 
+          [
+            "x", 
+            1
+          ], 
+          [
+            "y", 
+            "hello"
+          ]
+        ]
+      }, 
+      "line": 5, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "A"
+      ], 
+      "stdout": "", 
+      "func_name": "B", 
+      "stack_to_render": [
+        {
+          "frame_id": 2, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "B", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "B_f2", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "A": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "A", 
+          [], 
+          [
+            "x", 
+            1
+          ], 
+          [
+            "y", 
+            "hello"
+          ]
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "A"
+      ], 
+      "stdout": "", 
+      "func_name": "B", 
+      "stack_to_render": [
+        {
+          "frame_id": 2, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "B", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "B_f2", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "A": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "A", 
+          [], 
+          [
+            "x", 
+            1
+          ], 
+          [
+            "y", 
+            "hello"
+          ]
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "A"
+      ], 
+      "stdout": "", 
+      "func_name": "B", 
+      "stack_to_render": [
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
+            "z": "bye"
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "B", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "B_f2", 
+          "ordered_varnames": [
+            "z", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "A": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "A", 
+          [], 
+          [
+            "x", 
+            1
+          ], 
+          [
+            "y", 
+            "hello"
+          ]
+        ], 
+        "3": [
+          "DICT", 
+          [
+            "z", 
+            "bye"
+          ]
+        ]
+      }, 
+      "line": 6, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "A", 
+        "B"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "A": [
+          "REF", 
+          2
+        ], 
+        "B": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "A", 
+          [], 
+          [
+            "x", 
+            1
+          ], 
+          [
+            "y", 
+            "hello"
+          ]
+        ], 
+        "4": [
+          "CLASS", 
+          "B", 
+          [], 
+          [
+            "z", 
+            "bye"
+          ]
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "A", 
+        "B"
+      ], 
+      "stdout": "", 
+      "func_name": "C", 
+      "stack_to_render": [
+        {
+          "frame_id": 3, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "C", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "C_f3", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "A": [
+          "REF", 
+          2
+        ], 
+        "B": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
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diff --git a/example-code/py_tutorial.golden b/example-code/py_tutorial.golden
new file mode 100644
index 000000000..c46ed318f
--- /dev/null
+++ b/example-code/py_tutorial.golden
@@ -0,0 +1,4754 @@
+{
+  "code": "# Philip's 10-minute intro to Python\n\n# numbers!\nage = 26\npi = 3.14159\n\n# strings!\ns = 'Rutherford Birchard Hayes'\ntokens = s.split()\nfirstName = tokens[0]\nmiddleName = tokens[1]\nlastName = tokens[2]\ns2 = firstName + ' ' + middleName + ' ' + lastName\n\n# 'if' statement - indentation matters!\nif (s == s2):\n    print 'yes!!!'\nelse:\n    print 'nooooooo'\n\n# list (mutable sequence)\nbeatles = ['John', 'Paul', 'George']\nbeatles.append('Ringo')\n\n# 'for' loop - indentation matters!\nfor b in beatles:\n    print 'Hello', b\n\n# tuple (immutable sequence)\nages = (18, 21, 28, 21, 22, 18, 19, 34, 9)\n\n# set (no order, no duplicates)\nuniqueAges = set(ages)\nuniqueAges.add(18) # already in set, no effect\nuniqueAges.remove(21)\n\n# no guaranteed order when iterating over a set\nfor thisAge in uniqueAges:\n    print thisAge\n\n# testing set membership\nif 18 in uniqueAges:\n    print 'There is an 18-year-old present!'\n\n# sorting\nbeatles.sort() # in-place\norderedUniqueAges = sorted(uniqueAges) # new list\n\n# dict - mapping unique keys to values\nnetWorth = {}\nnetWorth['Donald Trump'] = 3000000000\nnetWorth['Bill Gates'] = 58000000000\nnetWorth['Tom Cruise'] = 40000000\nnetWorth['Joe Postdoc'] = 20000\n\n# iterating over key-value pairs:\nfor (person, worth) in netWorth.iteritems():\n    if worth < 1000000:\n        print 'haha', person, 'is not a millionaire'\n\n# testing dict membership\nif 'Tom Cruise' in netWorth:\n    print 'show me the money!'\n", 
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+}
diff --git a/example-code/sqrt.golden b/example-code/sqrt.golden
new file mode 100644
index 000000000..5d8be8e5d
--- /dev/null
+++ b/example-code/sqrt.golden
@@ -0,0 +1,8929 @@
+{
+  "code": "# Calculating square roots by Newton's method, inspired by SICP\n#   http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-10.html#%_sec_1.1.7\n\ndef sqrt(x):\n    def average(a, b):\n        return (a + b) / 2.0\n\n    def is_good_enough(guess):\n        return (abs((guess * guess) - x) < 0.001)\n\n    def improve(guess):\n        return average(guess, x / guess)\n\n    def sqrt_iter(guess):\n        if is_good_enough(guess):\n            return guess\n        else:\n            return sqrt_iter(improve(guess))\n\n    return sqrt_iter(1.0)\n\n\nans = sqrt(9)\n", 
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+          "average(a, b)", 
+          1
+        ], 
+        "3": [
+          "FUNCTION", 
+          "is_good_enough(guess)", 
+          1
+        ], 
+        "4": [
+          "FUNCTION", 
+          "improve(guess)", 
+          1
+        ], 
+        "5": [
+          "FUNCTION", 
+          "sqrt_iter(guess)", 
+          1
+        ]
+      }, 
+      "line": 18, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "sqrt"
+      ], 
+      "stdout": "", 
+      "func_name": "sqrt_iter", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 9, 
+            "sqrt_iter": [
+              "REF", 
+              5
+            ], 
+            "is_good_enough": [
+              "REF", 
+              3
+            ], 
+            "average": [
+              "REF", 
+              2
+            ], 
+            "improve": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "sqrt", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sqrt_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "average", 
+            "improve", 
+            "is_good_enough", 
+            "sqrt_iter"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "guess": 1.0
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sqrt_iter", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "sqrt_iter_f2", 
+          "ordered_varnames": [
+            "guess"
+          ]
+        }, 
+        {
+          "frame_id": 6, 
+          "encoded_locals": {
+            "guess": 5.0
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sqrt_iter", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "sqrt_iter_f6", 
+          "ordered_varnames": [
+            "guess"
+          ]
+        }, 
+        {
+          "frame_id": 10, 
+          "encoded_locals": {
+            "__return__": 3.0000915541313802, 
+            "guess": 3.3999999999999999
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sqrt_iter", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "sqrt_iter_f10", 
+          "ordered_varnames": [
+            "guess", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "sqrt": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sqrt(x)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "average(a, b)", 
+          1
+        ], 
+        "3": [
+          "FUNCTION", 
+          "is_good_enough(guess)", 
+          1
+        ], 
+        "4": [
+          "FUNCTION", 
+          "improve(guess)", 
+          1
+        ], 
+        "5": [
+          "FUNCTION", 
+          "sqrt_iter(guess)", 
+          1
+        ]
+      }, 
+      "line": 18, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "sqrt"
+      ], 
+      "stdout": "", 
+      "func_name": "sqrt_iter", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 9, 
+            "sqrt_iter": [
+              "REF", 
+              5
+            ], 
+            "is_good_enough": [
+              "REF", 
+              3
+            ], 
+            "average": [
+              "REF", 
+              2
+            ], 
+            "improve": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "sqrt", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sqrt_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "average", 
+            "improve", 
+            "is_good_enough", 
+            "sqrt_iter"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "guess": 1.0
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sqrt_iter", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "sqrt_iter_f2", 
+          "ordered_varnames": [
+            "guess"
+          ]
+        }, 
+        {
+          "frame_id": 6, 
+          "encoded_locals": {
+            "__return__": 3.0000915541313802, 
+            "guess": 5.0
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sqrt_iter", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "sqrt_iter_f6", 
+          "ordered_varnames": [
+            "guess", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "sqrt": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sqrt(x)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "average(a, b)", 
+          1
+        ], 
+        "3": [
+          "FUNCTION", 
+          "is_good_enough(guess)", 
+          1
+        ], 
+        "4": [
+          "FUNCTION", 
+          "improve(guess)", 
+          1
+        ], 
+        "5": [
+          "FUNCTION", 
+          "sqrt_iter(guess)", 
+          1
+        ]
+      }, 
+      "line": 18, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "sqrt"
+      ], 
+      "stdout": "", 
+      "func_name": "sqrt_iter", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 9, 
+            "sqrt_iter": [
+              "REF", 
+              5
+            ], 
+            "is_good_enough": [
+              "REF", 
+              3
+            ], 
+            "average": [
+              "REF", 
+              2
+            ], 
+            "improve": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "sqrt", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sqrt_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "average", 
+            "improve", 
+            "is_good_enough", 
+            "sqrt_iter"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": 3.0000915541313802, 
+            "guess": 1.0
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sqrt_iter", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "sqrt_iter_f2", 
+          "ordered_varnames": [
+            "guess", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "sqrt": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sqrt(x)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "average(a, b)", 
+          1
+        ], 
+        "3": [
+          "FUNCTION", 
+          "is_good_enough(guess)", 
+          1
+        ], 
+        "4": [
+          "FUNCTION", 
+          "improve(guess)", 
+          1
+        ], 
+        "5": [
+          "FUNCTION", 
+          "sqrt_iter(guess)", 
+          1
+        ]
+      }, 
+      "line": 18, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "sqrt"
+      ], 
+      "stdout": "", 
+      "func_name": "sqrt", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "sqrt_iter": [
+              "REF", 
+              5
+            ], 
+            "is_good_enough": [
+              "REF", 
+              3
+            ], 
+            "__return__": 3.0000915541313802, 
+            "x": 9, 
+            "average": [
+              "REF", 
+              2
+            ], 
+            "improve": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "sqrt", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sqrt_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "average", 
+            "improve", 
+            "is_good_enough", 
+            "sqrt_iter", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "sqrt": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sqrt(x)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "average(a, b)", 
+          1
+        ], 
+        "3": [
+          "FUNCTION", 
+          "is_good_enough(guess)", 
+          1
+        ], 
+        "4": [
+          "FUNCTION", 
+          "improve(guess)", 
+          1
+        ], 
+        "5": [
+          "FUNCTION", 
+          "sqrt_iter(guess)", 
+          1
+        ]
+      }, 
+      "line": 20, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "sqrt", 
+        "ans"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "sqrt_iter": [
+              "REF", 
+              5
+            ], 
+            "is_good_enough": [
+              "REF", 
+              3
+            ], 
+            "__return__": 3.0000915541313802, 
+            "x": 9, 
+            "average": [
+              "REF", 
+              2
+            ], 
+            "improve": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "sqrt", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sqrt_f1_p_z", 
+          "ordered_varnames": [
+            "x", 
+            "average", 
+            "improve", 
+            "is_good_enough", 
+            "sqrt_iter", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "sqrt": [
+          "REF", 
+          1
+        ], 
+        "ans": 3.0000915541313802
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sqrt(x)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "average(a, b)", 
+          1
+        ], 
+        "3": [
+          "FUNCTION", 
+          "is_good_enough(guess)", 
+          1
+        ], 
+        "4": [
+          "FUNCTION", 
+          "improve(guess)", 
+          1
+        ], 
+        "5": [
+          "FUNCTION", 
+          "sqrt_iter(guess)", 
+          1
+        ]
+      }, 
+      "line": 23, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/example-code/strtok.golden b/example-code/strtok.golden
new file mode 100644
index 000000000..2bd3a031a
--- /dev/null
+++ b/example-code/strtok.golden
@@ -0,0 +1,258 @@
+{
+  "code": "input = 'John,Doe,1984,4,1,male'\n\ntokens = input.split(',')\nfirstName = tokens[0]\nlastName = tokens[1]\nbirthdate = (int(tokens[2]), int(tokens[3]), int(tokens[4]))\nisMale = (tokens[5] == 'male')\n\nprint 'Hi', firstName, lastName\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "input": "John,Doe,1984,4,1,male"
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "tokens"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tokens": [
+          "REF", 
+          1
+        ], 
+        "input": "John,Doe,1984,4,1,male"
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "John", 
+          "Doe", 
+          "1984", 
+          "4", 
+          "1", 
+          "male"
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "tokens", 
+        "firstName"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tokens": [
+          "REF", 
+          1
+        ], 
+        "input": "John,Doe,1984,4,1,male", 
+        "firstName": "John"
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "John", 
+          "Doe", 
+          "1984", 
+          "4", 
+          "1", 
+          "male"
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "tokens", 
+        "firstName", 
+        "lastName"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tokens": [
+          "REF", 
+          1
+        ], 
+        "lastName": "Doe", 
+        "firstName": "John", 
+        "input": "John,Doe,1984,4,1,male"
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "John", 
+          "Doe", 
+          "1984", 
+          "4", 
+          "1", 
+          "male"
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "tokens", 
+        "firstName", 
+        "lastName", 
+        "birthdate"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tokens": [
+          "REF", 
+          1
+        ], 
+        "lastName": "Doe", 
+        "firstName": "John", 
+        "birthdate": [
+          "REF", 
+          2
+        ], 
+        "input": "John,Doe,1984,4,1,male"
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "John", 
+          "Doe", 
+          "1984", 
+          "4", 
+          "1", 
+          "male"
+        ], 
+        "2": [
+          "TUPLE", 
+          1984, 
+          4, 
+          1
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "tokens", 
+        "firstName", 
+        "lastName", 
+        "birthdate", 
+        "isMale"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "isMale": true, 
+        "firstName": "John", 
+        "lastName": "Doe", 
+        "birthdate": [
+          "REF", 
+          2
+        ], 
+        "tokens": [
+          "REF", 
+          1
+        ], 
+        "input": "John,Doe,1984,4,1,male"
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "John", 
+          "Doe", 
+          "1984", 
+          "4", 
+          "1", 
+          "male"
+        ], 
+        "2": [
+          "TUPLE", 
+          1984, 
+          4, 
+          1
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "tokens", 
+        "firstName", 
+        "lastName", 
+        "birthdate", 
+        "isMale"
+      ], 
+      "stdout": "Hi John Doe\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "isMale": true, 
+        "firstName": "John", 
+        "lastName": "Doe", 
+        "birthdate": [
+          "REF", 
+          2
+        ], 
+        "tokens": [
+          "REF", 
+          1
+        ], 
+        "input": "John,Doe,1984,4,1,male"
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "John", 
+          "Doe", 
+          "1984", 
+          "4", 
+          "1", 
+          "male"
+        ], 
+        "2": [
+          "TUPLE", 
+          1984, 
+          4, 
+          1
+        ]
+      }, 
+      "line": 9, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/example-code/sum-cubes.golden b/example-code/sum-cubes.golden
new file mode 100644
index 000000000..6eecbbe30
--- /dev/null
+++ b/example-code/sum-cubes.golden
@@ -0,0 +1,1693 @@
+{
+  "code": "def summation(n, term, next):\n  total, k = 0, 1\n  while k <= n:\n    total, k = total + term(k), next(k)\n    return total\n\ndef cube(k):\n  return pow(k, 3)\n\ndef successor(k):\n  return k + 1\n\ndef sum_cubes(n):\n  return summation(n, cube, successor)\n\nsum_cubes(3)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "summation"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "summation": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "summation(n, term, next)", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "summation", 
+        "cube"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "summation": [
+          "REF", 
+          1
+        ], 
+        "cube": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "summation(n, term, next)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "cube(k)", 
+          null
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "summation", 
+        "cube", 
+        "successor"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "summation": [
+          "REF", 
+          1
+        ], 
+        "cube": [
+          "REF", 
+          2
+        ], 
+        "successor": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "summation(n, term, next)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "cube(k)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "successor(k)", 
+          null
+        ]
+      }, 
+      "line": 13, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "summation", 
+        "cube", 
+        "successor", 
+        "sum_cubes"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "summation": [
+          "REF", 
+          1
+        ], 
+        "cube": [
+          "REF", 
+          2
+        ], 
+        "sum_cubes": [
+          "REF", 
+          4
+        ], 
+        "successor": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "summation(n, term, next)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "cube(k)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "successor(k)", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "sum_cubes(n)", 
+          null
+        ]
+      }, 
+      "line": 16, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "summation", 
+        "cube", 
+        "successor", 
+        "sum_cubes"
+      ], 
+      "stdout": "", 
+      "func_name": "sum_cubes", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "n": 3
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diff --git a/example-code/sum.golden b/example-code/sum.golden
new file mode 100644
index 000000000..aa7a44fb9
--- /dev/null
+++ b/example-code/sum.golden
@@ -0,0 +1,10030 @@
+{
+  "code": "# Higher-order functions\n# Adapted from MIT 6.01 course notes (Section A.2.2)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\ndef summation(low, high, f, next):\n    s = 0\n    x = low\n    while x <= high:\n        s = s + f(x)\n        x = next(x)\n    return s\n\ndef sumsquares(low, high):\n    return summation(low, high, lambda x: x**2, lambda x: x+1)\n\nprint sumsquares(1, 10)\n", 
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diff --git a/example-code/towers_of_hanoi.golden b/example-code/towers_of_hanoi.golden
new file mode 100644
index 000000000..0b98e6d8c
--- /dev/null
+++ b/example-code/towers_of_hanoi.golden
@@ -0,0 +1,10996 @@
+{
+  "code": "# move a stack of n disks from stack a to stack b,\n# using tmp as a temporary stack\ndef TowerOfHanoi(n, a, b, tmp):\n    if n == 1:\n        b.append(a.pop())\n    else:\n        TowerOfHanoi(n-1, a, tmp, b)\n        b.append(a.pop())\n        TowerOfHanoi(n-1, tmp, b, a)\n        \nstack1 = [4,3,2,1]\nstack2 = []\nstack3 = []\n      \n# transfer stack1 to stack3 using Tower of Hanoi rules\nTowerOfHanoi(len(stack1), stack1, stack3, stack2)\n", 
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diff --git a/example-code/wentworth_gcd.golden b/example-code/wentworth_gcd.golden
new file mode 100644
index 000000000..8a93dfeec
--- /dev/null
+++ b/example-code/wentworth_gcd.golden
@@ -0,0 +1,3798 @@
+{
+  "code": "# Tutorial code from Prof. Peter Wentworth\n# Rhodes University, South Africa (http://www.ru.ac.za/)\n\ndef gcd(x, y, depth=1):\n    '''\n    Find the greatest common divisor of x, y\n    Pre:  x >= y,  y >= 0, both x and y are int\n    '''\n    result = x       # set provisional return value\n    if y != 0:\n        indent = \"**\" * depth\n        print(\"%s About to recursively call gcd(%d, %d)\" % (indent, y, x%y))\n        result = gcd(y, x % y, depth+1)\n        print(\"%s result is %d\" % (indent, result))\n    return result\n\ndef main():\n    m = 77\n    n = 28\n    print(\"Finding gcd(%d, %d)\" % (m,n))\n    g = gcd(m, n)\n    print('Greatest common divisor of %d, %d = %d'\n          % (m, n, g))\n\nmain()\n\n", 
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+          "encoded_locals": {
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+            "indent": "****", 
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+          "is_highlighted": true, 
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+      ], 
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+      "event": "step_line"
+    }, 
+    {
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+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
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+        {
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+          "encoded_locals": {
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+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
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+        {
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+          "encoded_locals": {
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+        }, 
+        {
+          "frame_id": 4, 
+          "encoded_locals": {
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+            "x": 21, 
+            "depth": 3
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f4", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth"
+          ]
+        }
+      ], 
+      "globals": {
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+          "REF", 
+          2
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+          "REF", 
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+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
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+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
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+        {
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+          "encoded_locals": {
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+          "encoded_locals": {
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+            "depth": 3
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+          "is_highlighted": true, 
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+          "ordered_varnames": [
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+            "y", 
+            "depth"
+          ]
+        }
+      ], 
+      "globals": {
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
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+            "m": 77, 
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+            "indent": "**", 
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+          "encoded_locals": {
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+            "depth": 3, 
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+            "y", 
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+            "result"
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+      ], 
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
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+        "main"
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+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
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+            "x", 
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+            "result"
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+      "event": "step_line"
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+    {
+      "ordered_globals": [
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+        "main"
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+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
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+        {
+          "frame_id": 3, 
+          "encoded_locals": {
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+            "x": 28, 
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+          }, 
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+            "indent"
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+      ], 
+      "globals": {
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+      "event": "step_line"
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+    {
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+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
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+        {
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+          }, 
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+            "indent"
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+      "globals": {
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+      "event": "step_line"
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+    {
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+        "main"
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+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
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+          null
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+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
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+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
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+        {
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+          "encoded_locals": {
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+            "depth": 3, 
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+            "indent"
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+        {
+          "frame_id": 5, 
+          "encoded_locals": {
+            "y": 0, 
+            "x": 7, 
+            "depth": 4
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
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+          "unique_hash": "gcd_f5", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
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+            "indent": "**", 
+            "result": 77
+          }, 
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+        {
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+          "encoded_locals": {
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+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 5, 
+          "encoded_locals": {
+            "y": 0, 
+            "x": 7, 
+            "depth": 4, 
+            "result": 7
+          }, 
+          "is_highlighted": true, 
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+            "x", 
+            "y", 
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+            "result"
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+      ], 
+      "globals": {
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
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+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
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+            "indent": "****", 
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+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
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+        {
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+          "encoded_locals": {
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+            "indent": "******", 
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+          }, 
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+        {
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+          "encoded_locals": {
+            "y": 0, 
+            "x": 7, 
+            "depth": 4, 
+            "result": 7
+          }, 
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+      "globals": {
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+      "heap": {
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
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+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
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+          "encoded_locals": {
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+            "indent": "****", 
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+          }, 
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+          "unique_hash": "gcd_f3", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
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+            "result", 
+            "indent"
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+        {
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+          "encoded_locals": {
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+            "x": 21, 
+            "depth": 3, 
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+          "encoded_locals": {
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+            "x": 7, 
+            "depth": 4, 
+            "result": 7, 
+            "__return__": 7
+          }, 
+          "is_highlighted": true, 
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+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
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+          "REF", 
+          2
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+      "heap": {
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+      "line": 15, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
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+        {
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+            "y": 28, 
+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
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+          }, 
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+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
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+            "result", 
+            "indent"
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+        {
+          "frame_id": 3, 
+          "encoded_locals": {
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+            "x": 28, 
+            "depth": 2, 
+            "indent": "****", 
+            "result": 28
+          }, 
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+        {
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+          "encoded_locals": {
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+            "x": 21, 
+            "depth": 3, 
+            "indent": "******", 
+            "result": 7
+          }, 
+          "is_highlighted": true, 
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+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f4", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
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+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
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+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
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+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "y": 21, 
+            "x": 28, 
+            "depth": 2, 
+            "indent": "****", 
+            "result": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
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+          "is_zombie": false, 
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+          "unique_hash": "gcd_f3", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
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+        }, 
+        {
+          "frame_id": 4, 
+          "encoded_locals": {
+            "y": 7, 
+            "x": 21, 
+            "depth": 3, 
+            "indent": "******", 
+            "result": 7
+          }, 
+          "is_highlighted": true, 
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+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f4", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
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+      "line": 15, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
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+        {
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+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
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+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
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+            "x": 28, 
+            "depth": 2, 
+            "indent": "****", 
+            "result": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f3", 
+          "ordered_varnames": [
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+        {
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+          "encoded_locals": {
+            "indent": "******", 
+            "__return__": 7, 
+            "depth": 3, 
+            "result": 7, 
+            "y": 7, 
+            "x": 21
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f4", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 15, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 28, 
+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "y": 21, 
+            "x": 28, 
+            "depth": 2, 
+            "indent": "****", 
+            "result": 7
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f3", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 14, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 28, 
+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "y": 21, 
+            "x": 28, 
+            "depth": 2, 
+            "indent": "****", 
+            "result": 7
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f3", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 15, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 28, 
+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "indent": "****", 
+            "__return__": 7, 
+            "depth": 2, 
+            "result": 7, 
+            "y": 21, 
+            "x": 28
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f3", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 15, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 28, 
+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 7
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 14, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n** result is 7\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 28, 
+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 7
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 15, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n** result is 7\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "indent": "**", 
+            "__return__": 7, 
+            "depth": 1, 
+            "result": 7, 
+            "y": 28, 
+            "x": 77
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 15, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n** result is 7\n", 
+      "func_name": "main", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "g": 7, 
+            "n": 28
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n", 
+            "g"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 22, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n** result is 7\n", 
+      "func_name": "main", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "g": 7, 
+            "n": 28
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n", 
+            "g"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 23, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n** result is 7\nGreatest common divisor of 77, 28 = 7\n", 
+      "func_name": "main", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": null, 
+            "m": 77, 
+            "g": 7, 
+            "n": 28
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n", 
+            "g", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 23, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n** result is 7\nGreatest common divisor of 77, 28 = 7\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 25, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/example-code/wentworth_sumList.golden b/example-code/wentworth_sumList.golden
new file mode 100644
index 000000000..0cf2dfaee
--- /dev/null
+++ b/example-code/wentworth_sumList.golden
@@ -0,0 +1,4520 @@
+{
+  "code": "# Tutorial code from Prof. Peter Wentworth\n# Rhodes University, South Africa (http://www.ru.ac.za/)\n\ndef sumList(xs):\n    '''\n    Sum a list that can contain nested lists.\n    Precondition: All leaf elements are numbers.\n    '''\n    sum = 0\n    for e in xs:\n        if type(e) is list:\n            print(\"Calling sumList(%s) recursively\" % e)\n            v = sumList(e)\n            print(\"sumList(%s) returned %s\" % (e, v))\n            sum += v\n        else:\n            sum += e\n    return sum\n\n\ntestData = [10, [20, 30, [40], 50], 60]\nprint(\"Calling sumList(%s)\" % testData)\nresult = sumList(testData)\nprint(\"Final sum of all numbers in initial list is %s\" % result)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ]
+      }, 
+      "line": 21, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 22, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 23, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 0
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 0, 
+            "e": 10
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 0, 
+            "e": 10
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 17, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": 10
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 12, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 13, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 0
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 0, 
+            "e": 20
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
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+        ], 
+        "2": [
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+          [
+            "REF", 
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+          ], 
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+        ], 
+        "3": [
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+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
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+            "e": [
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+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
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+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 0, 
+            "e": 20
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
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+        ], 
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+        "4": [
+          "LIST", 
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+        ]
+      }, 
+      "line": 17, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 20, 
+            "e": 20
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
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+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
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+              "REF", 
+              2
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+            "sum": 10, 
+            "e": [
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+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 20, 
+            "e": 30
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
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+          [
+            "REF", 
+            3
+          ], 
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+        ], 
+        "3": [
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+          [
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+        "4": [
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+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 20, 
+            "e": 30
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
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+          [
+            "REF", 
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+          ], 
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+        "4": [
+          "LIST", 
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+        ]
+      }, 
+      "line": 17, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
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+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": 30
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
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+          ], 
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+        "3": [
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+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
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+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
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+          null
+        ], 
+        "2": [
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+          [
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+        "3": [
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+        "4": [
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+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
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+              3
+            ], 
+            "sum": 50, 
+            "e": [
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+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
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+          null
+        ], 
+        "2": [
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+          [
+            "REF", 
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+        "3": [
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+      }, 
+      "line": 12, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
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+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
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+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
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+        "2": [
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+          [
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+        "3": [
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+        "4": [
+          "LIST", 
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+      }, 
+      "line": 13, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f3", 
+          "ordered_varnames": [
+            "xs"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
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+          [
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+        "4": [
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+      }, 
+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
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+              3
+            ]
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+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f3", 
+          "ordered_varnames": [
+            "xs"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              4
+            ], 
+            "sum": 0
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f3", 
+          "ordered_varnames": [
+            "xs", 
+            "sum"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              4
+            ], 
+            "sum": 0, 
+            "e": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f3", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              4
+            ], 
+            "sum": 0, 
+            "e": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f3", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 17, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              4
+            ], 
+            "sum": 40, 
+            "e": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f3", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              4
+            ], 
+            "sum": 40, 
+            "e": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f3", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 18, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "__return__": 40, 
+            "xs": [
+              "REF", 
+              4
+            ], 
+            "sum": 40, 
+            "e": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f3", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 18, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ], 
+            "v": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 14, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ], 
+            "v": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 15, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 90, 
+            "e": [
+              "REF", 
+              4
+            ], 
+            "v": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 90, 
+            "e": 50, 
+            "v": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 90, 
+            "e": 50, 
+            "v": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 17, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 140, 
+            "e": 50, 
+            "v": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 140, 
+            "e": 50, 
+            "v": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 18, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": 140, 
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 140, 
+            "e": 50, 
+            "v": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 18, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ], 
+            "v": 140
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 14, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ], 
+            "v": 140
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 15, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 150, 
+            "e": [
+              "REF", 
+              3
+            ], 
+            "v": 140
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 150, 
+            "e": 60, 
+            "v": 140
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 150, 
+            "e": 60, 
+            "v": 140
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 17, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 210, 
+            "e": 60, 
+            "v": 140
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 210, 
+            "e": 60, 
+            "v": 140
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 18, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": 210, 
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 210, 
+            "e": 60, 
+            "v": 140
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 18, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData", 
+        "result"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "result": 210, 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 24, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData", 
+        "result"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\nFinal sum of all numbers in initial list is 210\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "result": 210, 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 24, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/example-code/wentworth_try_finally.golden b/example-code/wentworth_try_finally.golden
new file mode 100644
index 000000000..45fab6dd9
--- /dev/null
+++ b/example-code/wentworth_try_finally.golden
@@ -0,0 +1,2823 @@
+{
+  "code": "# Tutorial code from Prof. Peter Wentworth\n# Rhodes University, South Africa (http://www.ru.ac.za/)\n\n# Demonstrate recursion that throws an exception\n# at its base case, and the tracing of try ... finally.\n#\n# How many \"survived!\" messages will be printed???\n\ndef f(n):\n    try:\n        x = 10 / n\n        print \"x is\", x\n        f(n-1)\n        print \"survived!\"\n    finally:\n        print \"Bye from f where n =\", n\n\nf(4)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 18, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "n": 4
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 9, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "n": 4
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "n": 4
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 2, 
+            "n": 4
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 12, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2\n", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 2, 
+            "n": 4
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 13, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2\n", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 2, 
+            "n": 4
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
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+          "encoded_locals": {
+            "n": 3
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f2", 
+          "ordered_varnames": [
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+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
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+        ]
+      }, 
+      "line": 9, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2\n", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 2, 
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+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "f", 
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+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
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+            "x"
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+        }, 
+        {
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+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f2", 
+          "ordered_varnames": [
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+      ], 
+      "globals": {
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+      "heap": {
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+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2\n", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 2, 
+            "n": 4
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
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+          "encoded_locals": {
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+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f2", 
+          "ordered_varnames": [
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+      "globals": {
+        "f": [
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+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
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+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2\n", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 2, 
+            "n": 4
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 3, 
+            "n": 3
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f2", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 12, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2\nx is 3\n", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 2, 
+            "n": 4
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }, 
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+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 3, 
+            "n": 3
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f2", 
+          "ordered_varnames": [
+            "n", 
+            "x"
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+      "globals": {
+        "f": [
+          "REF", 
+          1
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+      "heap": {
+        "1": [
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+          "f(n)", 
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+        ]
+      }, 
+      "line": 13, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2\nx is 3\n", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 2, 
+            "n": 4
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
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+          "encoded_locals": {
+            "x": 3, 
+            "n": 3
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f2", 
+          "ordered_varnames": [
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+          "encoded_locals": {
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+          "is_highlighted": true, 
+          "is_parent": false, 
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+            "x": 2, 
+            "n": 4
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 3, 
+            "n": 3
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f2", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "x": 5, 
+            "n": 2
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f3", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 16, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2\nx is 3\nx is 5\nx is 10\nBye from f where n = 0\nBye from f where n = 1\nBye from f where n = 2\n", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 2, 
+            "n": 4
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 3, 
+            "n": 3
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f2", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "__return__": null, 
+            "x": 5, 
+            "n": 2
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f3", 
+          "ordered_varnames": [
+            "n", 
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 16, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2\nx is 3\nx is 5\nx is 10\nBye from f where n = 0\nBye from f where n = 1\nBye from f where n = 2\n", 
+      "exception_msg": "ZeroDivisionError: integer division or modulo by zero", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 2, 
+            "n": 4
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 3, 
+            "n": 3
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f2", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 13, 
+      "event": "exception"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2\nx is 3\nx is 5\nx is 10\nBye from f where n = 0\nBye from f where n = 1\nBye from f where n = 2\n", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 2, 
+            "n": 4
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 3, 
+            "n": 3
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f2", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 16, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2\nx is 3\nx is 5\nx is 10\nBye from f where n = 0\nBye from f where n = 1\nBye from f where n = 2\nBye from f where n = 3\n", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 2, 
+            "n": 4
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": null, 
+            "x": 3, 
+            "n": 3
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f2", 
+          "ordered_varnames": [
+            "n", 
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 16, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2\nx is 3\nx is 5\nx is 10\nBye from f where n = 0\nBye from f where n = 1\nBye from f where n = 2\nBye from f where n = 3\n", 
+      "exception_msg": "ZeroDivisionError: integer division or modulo by zero", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 2, 
+            "n": 4
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 13, 
+      "event": "exception"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2\nx is 3\nx is 5\nx is 10\nBye from f where n = 0\nBye from f where n = 1\nBye from f where n = 2\nBye from f where n = 3\n", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 2, 
+            "n": 4
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 16, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2\nx is 3\nx is 5\nx is 10\nBye from f where n = 0\nBye from f where n = 1\nBye from f where n = 2\nBye from f where n = 3\nBye from f where n = 4\n", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": null, 
+            "x": 2, 
+            "n": 4
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n", 
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 16, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2\nx is 3\nx is 5\nx is 10\nBye from f where n = 0\nBye from f where n = 1\nBye from f where n = 2\nBye from f where n = 3\nBye from f where n = 4\n", 
+      "exception_msg": "ZeroDivisionError: integer division or modulo by zero", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 18, 
+      "event": "exception"
+    }
+  ]
+}

From a909c4658b5a148948ad542cf8c62d33290587c8 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 21 Aug 2012 12:07:44 -0700
Subject: [PATCH 145/502] implemented more robust detection of nested function
 parent frames

---
 PyTutorGAE/pg_logger.py                       |    7 -
 .../tests/backend-tests/lambda_1.golden       |  951 ++++-----
 PyTutorGAE/tests/golden_test.py               |   12 +-
 example-code/closures/lambda-param.golden     |  129 +-
 example-code/map.golden                       |  473 ++---
 example-code/sum.golden                       | 1751 +++++++++--------
 6 files changed, 1699 insertions(+), 1624 deletions(-)

diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index c9771975f..2035ccd76 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -378,7 +378,6 @@ def create_encoded_stack_entry(cur_frame):
                 v not in self.closures and \
                 v not in self.globally_defined_funcs):
 
-              '''
               # Look for the presence of v.func_code (code object) in
               # the constant pool (f_code.co_consts) of an enclosing
               # stack frame, and set that frame as your parent.
@@ -407,12 +406,6 @@ def create_encoded_stack_entry(cur_frame):
               self.parent_frames_set.add(chosen_parent_frame) # unequivocally add to this set!!!
               if not chosen_parent_frame in self.zombie_frames:
                 self.zombie_frames.append(chosen_parent_frame)
-              '''
-
-              self.closures[v] = top_frame
-              self.parent_frames_set.add(top_frame) # unequivocally add to this set!!!
-              if not top_frame in self.zombie_frames:
-                self.zombie_frames.append(top_frame)
         else:
           # if there is only a global scope visible ...
           for (k, v) in get_user_globals(top_frame).items():
diff --git a/PyTutorGAE/tests/backend-tests/lambda_1.golden b/PyTutorGAE/tests/backend-tests/lambda_1.golden
index ae5ae9068..913c30a55 100644
--- a/PyTutorGAE/tests/backend-tests/lambda_1.golden
+++ b/PyTutorGAE/tests/backend-tests/lambda_1.golden
@@ -184,11 +184,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -209,11 +209,11 @@
             ]
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -246,12 +246,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 1, 
@@ -272,11 +272,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -297,11 +297,11 @@
             ]
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -334,12 +334,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 2, 
@@ -360,11 +360,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -386,11 +386,11 @@
             ]
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -424,12 +424,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 3, 
@@ -450,11 +450,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -477,11 +477,11 @@
             "x": 1
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -516,12 +516,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 4, 
@@ -542,11 +542,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -569,11 +569,11 @@
             "x": 1
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -608,12 +608,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 5, 
@@ -634,11 +634,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -661,11 +661,11 @@
             "x": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -677,16 +677,20 @@
         }, 
         {
           "frame_id": 3, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 1
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f3", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -713,12 +717,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -739,11 +743,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -766,11 +770,11 @@
             "x": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -782,16 +786,20 @@
         }, 
         {
           "frame_id": 3, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 1
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f3", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -818,12 +826,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -844,11 +852,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -871,11 +879,11 @@
             "x": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -888,17 +896,19 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 1
+            "__return__": 1, 
+            "x": 1
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f3", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -927,12 +937,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -953,11 +963,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -980,11 +990,11 @@
             "x": 1
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1019,12 +1029,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 6, 
@@ -1045,11 +1055,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1072,11 +1082,11 @@
             "x": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1088,16 +1098,20 @@
         }, 
         {
           "frame_id": 4, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 1
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f4", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -1124,12 +1138,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -1150,11 +1164,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1177,11 +1191,11 @@
             "x": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1193,16 +1207,20 @@
         }, 
         {
           "frame_id": 4, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 1
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f4", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -1229,12 +1247,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -1255,11 +1273,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1282,11 +1300,11 @@
             "x": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1299,17 +1317,19 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 2
+            "__return__": 2, 
+            "x": 1
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f4", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -1338,12 +1358,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -1364,11 +1384,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1391,11 +1411,11 @@
             "x": 2
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1430,12 +1450,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 4, 
@@ -1456,11 +1476,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1483,11 +1503,11 @@
             "x": 2
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1522,12 +1542,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 5, 
@@ -1548,11 +1568,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1575,11 +1595,11 @@
             "x": 2
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1591,16 +1611,20 @@
         }, 
         {
           "frame_id": 5, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 2
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f5", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -1627,12 +1651,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -1653,11 +1677,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1680,11 +1704,11 @@
             "x": 2
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1696,16 +1720,20 @@
         }, 
         {
           "frame_id": 5, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 2
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f5", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -1732,12 +1760,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -1758,11 +1786,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1785,11 +1813,11 @@
             "x": 2
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1802,17 +1830,19 @@
         {
           "frame_id": 5, 
           "encoded_locals": {
-            "__return__": 4
+            "__return__": 4, 
+            "x": 2
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f5", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -1841,12 +1871,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -1867,11 +1897,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1894,11 +1924,11 @@
             "x": 2
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1933,12 +1963,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 6, 
@@ -1959,11 +1989,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1986,11 +2016,11 @@
             "x": 2
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2002,16 +2032,20 @@
         }, 
         {
           "frame_id": 6, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 2
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f6", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -2038,12 +2072,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -2064,11 +2098,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2091,11 +2125,11 @@
             "x": 2
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2107,16 +2141,20 @@
         }, 
         {
           "frame_id": 6, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 2
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f6", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -2143,12 +2181,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -2169,11 +2207,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2196,11 +2234,11 @@
             "x": 2
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2213,17 +2251,19 @@
         {
           "frame_id": 6, 
           "encoded_locals": {
-            "__return__": 3
+            "__return__": 3, 
+            "x": 2
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f6", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -2252,12 +2292,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -2278,11 +2318,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2305,11 +2345,11 @@
             "x": 3
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2344,12 +2384,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 4, 
@@ -2370,11 +2410,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2397,11 +2437,11 @@
             "x": 3
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2436,12 +2476,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 5, 
@@ -2462,11 +2502,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2489,11 +2529,11 @@
             "x": 3
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2505,16 +2545,20 @@
         }, 
         {
           "frame_id": 7, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 3
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f7", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -2541,12 +2585,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -2567,11 +2611,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2594,11 +2638,11 @@
             "x": 3
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2610,16 +2654,20 @@
         }, 
         {
           "frame_id": 7, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 3
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f7", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -2646,12 +2694,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -2672,11 +2720,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2699,11 +2747,11 @@
             "x": 3
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2716,17 +2764,19 @@
         {
           "frame_id": 7, 
           "encoded_locals": {
-            "__return__": 9
+            "__return__": 9, 
+            "x": 3
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f7", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -2755,12 +2805,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -2781,11 +2831,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2808,11 +2858,11 @@
             "x": 3
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2847,12 +2897,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 6, 
@@ -2873,11 +2923,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2900,11 +2950,11 @@
             "x": 3
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2916,16 +2966,20 @@
         }, 
         {
           "frame_id": 8, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 3
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f8", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -2952,12 +3006,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -2978,11 +3032,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3005,11 +3059,11 @@
             "x": 3
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3021,16 +3075,20 @@
         }, 
         {
           "frame_id": 8, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 3
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f8", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -3057,12 +3115,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -3083,11 +3141,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3110,11 +3168,11 @@
             "x": 3
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3127,17 +3185,19 @@
         {
           "frame_id": 8, 
           "encoded_locals": {
-            "__return__": 4
+            "__return__": 4, 
+            "x": 3
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f8", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -3166,12 +3226,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -3192,11 +3252,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3219,11 +3279,11 @@
             "x": 4
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3258,12 +3318,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 4, 
@@ -3284,11 +3344,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3311,11 +3371,11 @@
             "x": 4
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3350,12 +3410,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 5, 
@@ -3376,11 +3436,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3403,11 +3463,11 @@
             "x": 4
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3419,16 +3479,20 @@
         }, 
         {
           "frame_id": 9, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 4
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f9", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -3455,12 +3519,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -3481,11 +3545,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3508,11 +3572,11 @@
             "x": 4
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3524,16 +3588,20 @@
         }, 
         {
           "frame_id": 9, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 4
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f9", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -3560,12 +3628,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -3586,11 +3654,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3613,11 +3681,11 @@
             "x": 4
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3630,17 +3698,19 @@
         {
           "frame_id": 9, 
           "encoded_locals": {
-            "__return__": 16
+            "__return__": 16, 
+            "x": 4
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f9", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -3669,12 +3739,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -3695,11 +3765,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3722,11 +3792,11 @@
             "x": 4
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3761,12 +3831,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 6, 
@@ -3787,11 +3857,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3814,11 +3884,11 @@
             "x": 4
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3830,16 +3900,20 @@
         }, 
         {
           "frame_id": 10, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 4
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f10", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -3866,12 +3940,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
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       "line": 10, 
@@ -3892,11 +3966,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3919,11 +3993,11 @@
             "x": 4
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3935,16 +4009,20 @@
         }, 
         {
           "frame_id": 10, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 4
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f10", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -3971,12 +4049,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
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       "line": 10, 
@@ -3997,11 +4075,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4024,11 +4102,11 @@
             "x": 4
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4041,17 +4119,19 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "__return__": 5
+            "__return__": 5, 
+            "x": 4
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f10", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -4080,12 +4160,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
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       "line": 10, 
@@ -4106,11 +4186,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4133,11 +4213,11 @@
             "x": 5
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4172,12 +4252,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
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       "line": 4, 
@@ -4198,11 +4278,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4225,11 +4305,11 @@
             "x": 5
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4264,12 +4344,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
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       "line": 5, 
@@ -4290,11 +4370,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4317,11 +4397,11 @@
             "x": 5
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4333,16 +4413,20 @@
         }, 
         {
           "frame_id": 11, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 5
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f11", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -4369,12 +4453,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
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       "line": 10, 
@@ -4395,11 +4479,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4422,11 +4506,11 @@
             "x": 5
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4438,16 +4522,20 @@
         }, 
         {
           "frame_id": 11, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 5
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f11", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -4474,12 +4562,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
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       "line": 10, 
@@ -4500,11 +4588,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4527,11 +4615,11 @@
             "x": 5
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4544,17 +4632,19 @@
         {
           "frame_id": 11, 
           "encoded_locals": {
-            "__return__": 25
+            "__return__": 25, 
+            "x": 5
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f11", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -4583,12 +4673,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
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       "line": 10, 
@@ -4609,11 +4699,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4636,11 +4726,11 @@
             "x": 5
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4675,12 +4765,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
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       "line": 6, 
@@ -4701,11 +4791,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4728,11 +4818,11 @@
             "x": 5
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4744,16 +4834,20 @@
         }, 
         {
           "frame_id": 12, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 5
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f12", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -4780,12 +4874,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
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       "line": 10, 
@@ -4806,11 +4900,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4833,11 +4927,11 @@
             "x": 5
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4849,16 +4943,20 @@
         }, 
         {
           "frame_id": 12, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 5
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f12", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -4885,12 +4983,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
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         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
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       "line": 10, 
@@ -4911,11 +5009,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4938,11 +5036,11 @@
             "x": 5
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4955,17 +5053,19 @@
         {
           "frame_id": 12, 
           "encoded_locals": {
-            "__return__": 6
+            "__return__": 6, 
+            "x": 5
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f12", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -4994,12 +5094,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
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       "line": 10, 
@@ -5020,11 +5120,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -5047,11 +5147,11 @@
             "x": 6
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -5086,12 +5186,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 4, 
@@ -5112,11 +5212,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -5139,11 +5239,11 @@
             "x": 6
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -5178,12 +5278,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
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       "line": 7, 
@@ -5204,11 +5304,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -5232,11 +5332,11 @@
             "x": 6
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -5272,12 +5372,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
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       "line": 7, 
@@ -5299,47 +5399,14 @@
             "low": 1
           }, 
           "is_highlighted": true, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
-          "ordered_varnames": [
-            "low", 
-            "high", 
-            "__return__"
-          ]
-        }, 
-        {
-          "frame_id": 2, 
-          "encoded_locals": {
-            "f": [
-              "REF", 
-              4
-            ], 
-            "next": [
-              "REF", 
-              3
-            ], 
-            "high": 5, 
-            "s": 55, 
-            "low": 1, 
-            "__return__": 55, 
-            "x": 6
-          }, 
-          "is_highlighted": false, 
-          "is_parent": true, 
-          "func_name": "summation", 
-          "is_zombie": true, 
-          "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p_z", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high", 
-            "f", 
-            "next", 
-            "s", 
-            "x", 
             "__return__"
           ]
         }
@@ -5364,16 +5431,6 @@
           "FUNCTION", 
           "sumsquares(low, high)", 
           null
-        ], 
-        "3": [
-          "FUNCTION", 
-          "\u03bb(x)", 
-          2
-        ], 
-        "4": [
-          "FUNCTION", 
-          "\u03bb(x)", 
-          2
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       }, 
       "line": 10, 
@@ -5388,35 +5445,21 @@
       "func_name": "", 
       "stack_to_render": [
         {
-          "frame_id": 2, 
+          "frame_id": 1, 
           "encoded_locals": {
-            "f": [
-              "REF", 
-              4
-            ], 
-            "next": [
-              "REF", 
-              3
-            ], 
             "high": 5, 
-            "s": 55, 
-            "low": 1, 
             "__return__": 55, 
-            "x": 6
+            "low": 1
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
-          "func_name": "summation", 
+          "func_name": "sumsquares", 
           "is_zombie": true, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p_z", 
+          "unique_hash": "sumsquares_f1_p_z", 
           "ordered_varnames": [
             "low", 
             "high", 
-            "f", 
-            "next", 
-            "s", 
-            "x", 
             "__return__"
           ]
         }
@@ -5441,16 +5484,6 @@
           "FUNCTION", 
           "sumsquares(low, high)", 
           null
-        ], 
-        "3": [
-          "FUNCTION", 
-          "\u03bb(x)", 
-          2
-        ], 
-        "4": [
-          "FUNCTION", 
-          "\u03bb(x)", 
-          2
         ]
       }, 
       "line": 12, 
diff --git a/PyTutorGAE/tests/golden_test.py b/PyTutorGAE/tests/golden_test.py
index 9149c5d84..0e4288034 100644
--- a/PyTutorGAE/tests/golden_test.py
+++ b/PyTutorGAE/tests/golden_test.py
@@ -13,8 +13,6 @@
 
 INPUT_FILE_EXTENSION = '.txt' # input test files are .txt, NOT .py
 
-TEST_DIR = '.'
-
 
 ALL_TESTS = []
 
@@ -80,9 +78,9 @@ def golden_differs_from_out(golden_file):
 def diff_test_output(test_name):
   (base, ext) = os.path.splitext(test_name)
 
-  golden_file = os.path.join(TEST_DIR, base + '.golden')
+  golden_file = base + '.golden'
   assert os.path.isfile(golden_file)
-  outfile = os.path.join(TEST_DIR, base + '.out')
+  outfile = base + '.out'
   assert os.path.isfile(outfile)
 
   golden_s = open(golden_file).readlines()
@@ -111,10 +109,10 @@ def run_test(input_filename, clobber_golden=False):
   if os.path.isfile(outfile):
     os.remove(outfile)
 
-  input_fullpath = os.path.join(TEST_DIR, input_filename)
+  input_fullpath = input_filename
   execute(input_fullpath)
 
-  golden_file = os.path.join(TEST_DIR, base + '.golden')
+  golden_file = base + '.golden'
   if os.path.isfile(golden_file):
     if golden_differs_from_out(golden_file):
       print "  FAILED"
@@ -166,7 +164,7 @@ def diff_all_test_outputs():
   elif options.only_clobber:
     for t in ALL_TESTS:
       (base, ext) = os.path.splitext(t)
-      golden_file = os.path.join(TEST_DIR, base + '.golden')
+      golden_file = base + '.golden'
       clobber_golden_file(golden_file)
   else:
     parser.print_help()
diff --git a/example-code/closures/lambda-param.golden b/example-code/closures/lambda-param.golden
index 57c68cc3e..1ff7a8385 100644
--- a/example-code/closures/lambda-param.golden
+++ b/example-code/closures/lambda-param.golden
@@ -179,11 +179,11 @@
             "x": 10
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "foo", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "foo_f1", 
+          "unique_hash": "foo_f1_p", 
           "ordered_varnames": [
             "x"
           ]
@@ -197,11 +197,11 @@
             ]
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "bar", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "bar_f2_p", 
+          "unique_hash": "bar_f2", 
           "ordered_varnames": [
             "a"
           ]
@@ -231,7 +231,7 @@
         "3": [
           "FUNCTION", 
           "\u03bb(y)", 
-          2
+          1
         ]
       }, 
       "line": 4, 
@@ -251,11 +251,11 @@
             "x": 10
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "foo", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "foo_f1", 
+          "unique_hash": "foo_f1_p", 
           "ordered_varnames": [
             "x"
           ]
@@ -269,11 +269,11 @@
             ]
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "bar", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "bar_f2_p", 
+          "unique_hash": "bar_f2", 
           "ordered_varnames": [
             "a"
           ]
@@ -303,7 +303,7 @@
         "3": [
           "FUNCTION", 
           "\u03bb(y)", 
-          2
+          1
         ]
       }, 
       "line": 5, 
@@ -323,11 +323,11 @@
             "x": 10
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "foo", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "foo_f1", 
+          "unique_hash": "foo_f1_p", 
           "ordered_varnames": [
             "x"
           ]
@@ -341,11 +341,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "bar", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "bar_f2_p", 
+          "unique_hash": "bar_f2", 
           "ordered_varnames": [
             "a"
           ]
@@ -353,20 +353,18 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "y": 20, 
-            "x": 10
+            "y": 20
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f3", 
           "ordered_varnames": [
-            "y", 
-            "x"
+            "y"
           ]
         }
       ], 
@@ -394,7 +392,7 @@
         "3": [
           "FUNCTION", 
           "\u03bb(y)", 
-          2
+          1
         ]
       }, 
       "line": 2, 
@@ -414,11 +412,11 @@
             "x": 10
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "foo", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "foo_f1", 
+          "unique_hash": "foo_f1_p", 
           "ordered_varnames": [
             "x"
           ]
@@ -432,11 +430,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "bar", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "bar_f2_p", 
+          "unique_hash": "bar_f2", 
           "ordered_varnames": [
             "a"
           ]
@@ -444,20 +442,18 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "y": 20, 
-            "x": 10
+            "y": 20
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f3", 
           "ordered_varnames": [
-            "y", 
-            "x"
+            "y"
           ]
         }
       ], 
@@ -485,7 +481,7 @@
         "3": [
           "FUNCTION", 
           "\u03bb(y)", 
-          2
+          1
         ]
       }, 
       "line": 2, 
@@ -505,11 +501,11 @@
             "x": 10
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "foo", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "foo_f1", 
+          "unique_hash": "foo_f1_p", 
           "ordered_varnames": [
             "x"
           ]
@@ -523,11 +519,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "bar", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "bar_f2_p", 
+          "unique_hash": "bar_f2", 
           "ordered_varnames": [
             "a"
           ]
@@ -536,7 +532,6 @@
           "frame_id": 3, 
           "encoded_locals": {
             "y": 20, 
-            "x": 10, 
             "__return__": 30
           }, 
           "is_highlighted": true, 
@@ -544,12 +539,11 @@
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f3", 
           "ordered_varnames": [
             "y", 
-            "x", 
             "__return__"
           ]
         }
@@ -578,7 +572,7 @@
         "3": [
           "FUNCTION", 
           "\u03bb(y)", 
-          2
+          1
         ]
       }, 
       "line": 2, 
@@ -598,11 +592,11 @@
             "x": 10
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "foo", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "foo_f1", 
+          "unique_hash": "foo_f1_p", 
           "ordered_varnames": [
             "x"
           ]
@@ -617,11 +611,11 @@
             "__return__": null
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "bar", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "bar_f2_p", 
+          "unique_hash": "bar_f2", 
           "ordered_varnames": [
             "a", 
             "__return__"
@@ -652,7 +646,7 @@
         "3": [
           "FUNCTION", 
           "\u03bb(y)", 
-          2
+          1
         ]
       }, 
       "line": 5, 
@@ -673,35 +667,15 @@
             "x": 10
           }, 
           "is_highlighted": true, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "foo", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "foo_f1", 
+          "unique_hash": "foo_f1_p", 
           "ordered_varnames": [
             "x", 
             "__return__"
           ]
-        }, 
-        {
-          "frame_id": 2, 
-          "encoded_locals": {
-            "a": [
-              "REF", 
-              3
-            ], 
-            "__return__": null
-          }, 
-          "is_highlighted": false, 
-          "is_parent": true, 
-          "func_name": "bar", 
-          "is_zombie": true, 
-          "parent_frame_id_list": [], 
-          "unique_hash": "bar_f2_p_z", 
-          "ordered_varnames": [
-            "a", 
-            "__return__"
-          ]
         }
       ], 
       "globals": {
@@ -724,11 +698,6 @@
           "FUNCTION", 
           "bar(a)", 
           null
-        ], 
-        "3": [
-          "FUNCTION", 
-          "\u03bb(y)", 
-          2
         ]
       }, 
       "line": 2, 
@@ -743,22 +712,19 @@
       "func_name": "", 
       "stack_to_render": [
         {
-          "frame_id": 2, 
+          "frame_id": 1, 
           "encoded_locals": {
-            "a": [
-              "REF", 
-              3
-            ], 
-            "__return__": null
+            "__return__": null, 
+            "x": 10
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
-          "func_name": "bar", 
+          "func_name": "foo", 
           "is_zombie": true, 
           "parent_frame_id_list": [], 
-          "unique_hash": "bar_f2_p_z", 
+          "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
-            "a", 
+            "x", 
             "__return__"
           ]
         }
@@ -783,11 +749,6 @@
           "FUNCTION", 
           "bar(a)", 
           null
-        ], 
-        "3": [
-          "FUNCTION", 
-          "\u03bb(y)", 
-          2
         ]
       }, 
       "line": 7, 
diff --git a/example-code/map.golden b/example-code/map.golden
index 4334221df..0418b1935 100644
--- a/example-code/map.golden
+++ b/example-code/map.golden
@@ -261,11 +261,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -283,11 +283,11 @@
             ]
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -330,7 +330,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 5, 
@@ -354,11 +354,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -376,11 +376,11 @@
             ]
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -423,7 +423,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 6, 
@@ -447,11 +447,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -469,11 +469,11 @@
             ]
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -516,7 +516,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 9, 
@@ -540,11 +540,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -562,11 +562,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -582,7 +582,7 @@
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f3", 
           "ordered_varnames": [
@@ -626,7 +626,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 12, 
@@ -650,11 +650,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -672,11 +672,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -692,7 +692,7 @@
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f3", 
           "ordered_varnames": [
@@ -736,7 +736,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 12, 
@@ -760,11 +760,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -782,11 +782,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -803,7 +803,7 @@
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f3", 
           "ordered_varnames": [
@@ -848,7 +848,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 12, 
@@ -872,11 +872,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -894,11 +894,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -964,7 +964,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "5": [
           "LIST", 
@@ -995,11 +995,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -1017,11 +1017,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -1087,7 +1087,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "5": [
           "LIST", 
@@ -1118,11 +1118,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -1140,11 +1140,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -1210,7 +1210,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "5": [
           "LIST", 
@@ -1241,11 +1241,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
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@@ -1263,11 +1263,11 @@
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@@ -1306,7 +1306,7 @@
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@@ -1350,7 +1350,7 @@
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@@ -1381,11 +1381,11 @@
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@@ -1403,11 +1403,11 @@
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@@ -1446,7 +1446,7 @@
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@@ -1490,7 +1490,7 @@
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@@ -1521,11 +1521,11 @@
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           "parent_frame_id_list": [], 
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@@ -1543,11 +1543,11 @@
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@@ -1587,7 +1587,7 @@
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@@ -1632,7 +1632,7 @@
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@@ -1663,11 +1663,11 @@
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@@ -1685,11 +1685,11 @@
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@@ -1778,7 +1778,7 @@
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@@ -1815,11 +1815,11 @@
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@@ -1837,11 +1837,11 @@
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@@ -1930,7 +1930,7 @@
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@@ -1967,11 +1967,11 @@
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           "parent_frame_id_list": [], 
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@@ -1989,11 +1989,11 @@
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@@ -2082,7 +2082,7 @@
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@@ -2119,11 +2119,11 @@
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           "parent_frame_id_list": [], 
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@@ -2141,11 +2141,11 @@
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@@ -2207,7 +2207,7 @@
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@@ -2251,7 +2251,7 @@
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@@ -2288,11 +2288,11 @@
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@@ -2310,11 +2310,11 @@
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@@ -2376,7 +2376,7 @@
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@@ -2420,7 +2420,7 @@
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@@ -2457,11 +2457,11 @@
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@@ -2479,11 +2479,11 @@
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@@ -2546,7 +2546,7 @@
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@@ -2591,7 +2591,7 @@
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@@ -2628,11 +2628,11 @@
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@@ -2650,11 +2650,11 @@
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@@ -2766,7 +2766,7 @@
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@@ -2808,11 +2808,11 @@
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@@ -2830,11 +2830,11 @@
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@@ -3010,11 +3010,11 @@
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@@ -3168,11 +3168,11 @@
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@@ -3190,11 +3190,11 @@
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@@ -3279,7 +3279,7 @@
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@@ -3323,7 +3323,7 @@
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@@ -3365,11 +3365,11 @@
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@@ -3387,11 +3387,11 @@
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@@ -3476,7 +3476,7 @@
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@@ -3520,7 +3520,7 @@
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@@ -3562,11 +3562,11 @@
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@@ -3584,11 +3584,11 @@
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@@ -3674,7 +3674,7 @@
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@@ -3719,7 +3719,7 @@
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@@ -3761,11 +3761,11 @@
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@@ -3783,11 +3783,11 @@
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@@ -3922,7 +3922,7 @@
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@@ -3968,11 +3968,11 @@
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@@ -3990,11 +3990,11 @@
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@@ -4175,11 +4175,11 @@
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@@ -4197,11 +4197,11 @@
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@@ -4382,11 +4382,11 @@
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@@ -4404,11 +4404,11 @@
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@@ -4516,7 +4516,7 @@
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@@ -4560,7 +4560,7 @@
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@@ -4606,11 +4606,11 @@
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@@ -4628,11 +4628,11 @@
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@@ -4740,7 +4740,7 @@
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@@ -4784,7 +4784,7 @@
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@@ -4830,11 +4830,11 @@
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-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -4852,11 +4852,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -4965,7 +4965,7 @@
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f11", 
           "ordered_varnames": [
@@ -5010,7 +5010,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "5": [
           "LIST", 
@@ -5056,11 +5056,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -5078,11 +5078,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -5240,7 +5240,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "5": [
           "LIST", 
@@ -5289,11 +5289,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -5311,11 +5311,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -5473,7 +5473,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "5": [
           "LIST", 
@@ -5522,11 +5522,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -5544,11 +5544,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -5706,7 +5706,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "5": [
           "LIST", 
@@ -5755,11 +5755,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -5777,11 +5777,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -5944,7 +5944,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "5": [
           "LIST", 
@@ -5996,11 +5996,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -6018,11 +6018,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -6162,7 +6162,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "5": [
           "LIST", 
@@ -6212,11 +6212,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -6234,11 +6234,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -6355,7 +6355,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "5": [
           "LIST", 
@@ -6402,11 +6402,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -6424,11 +6424,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -6522,7 +6522,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "5": [
           "LIST", 
@@ -6565,11 +6565,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -6587,11 +6587,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst"
@@ -6662,7 +6662,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "5": [
           "LIST", 
@@ -6700,11 +6700,11 @@
             ]
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
             "lst"
           ]
@@ -6726,11 +6726,11 @@
             ]
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "map", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p", 
+          "unique_hash": "map_f2", 
           "ordered_varnames": [
             "func", 
             "lst", 
@@ -6774,7 +6774,7 @@
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "15": [
           "LIST", 
@@ -6810,40 +6810,12 @@
             ]
           }, 
           "is_highlighted": true, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "halveElements", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "halveElements_f1", 
-          "ordered_varnames": [
-            "lst", 
-            "__return__"
-          ]
-        }, 
-        {
-          "frame_id": 2, 
-          "encoded_locals": {
-            "__return__": [
-              "REF", 
-              15
-            ], 
-            "lst": [
-              "REF", 
-              3
-            ], 
-            "func": [
-              "REF", 
-              4
-            ]
-          }, 
-          "is_highlighted": false, 
-          "is_parent": true, 
-          "func_name": "map", 
-          "is_zombie": true, 
-          "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p_z", 
+          "unique_hash": "halveElements_f1_p", 
           "ordered_varnames": [
-            "func", 
             "lst", 
             "__return__"
           ]
@@ -6882,11 +6854,6 @@
           8, 
           10
         ], 
-        "4": [
-          "FUNCTION", 
-          "\u03bb(x)", 
-          2
-        ], 
         "15": [
           "LIST", 
           1.0, 
@@ -6910,7 +6877,7 @@
       "func_name": "", 
       "stack_to_render": [
         {
-          "frame_id": 2, 
+          "frame_id": 1, 
           "encoded_locals": {
             "__return__": [
               "REF", 
@@ -6919,20 +6886,15 @@
             "lst": [
               "REF", 
               3
-            ], 
-            "func": [
-              "REF", 
-              4
             ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
-          "func_name": "map", 
+          "func_name": "halveElements", 
           "is_zombie": true, 
           "parent_frame_id_list": [], 
-          "unique_hash": "map_f2_p_z", 
+          "unique_hash": "halveElements_f1_p_z", 
           "ordered_varnames": [
-            "func", 
             "lst", 
             "__return__"
           ]
@@ -6975,11 +6937,6 @@
           8, 
           10
         ], 
-        "4": [
-          "FUNCTION", 
-          "\u03bb(x)", 
-          2
-        ], 
         "15": [
           "LIST", 
           1.0, 
diff --git a/example-code/sum.golden b/example-code/sum.golden
index aa7a44fb9..ba7fd8dab 100644
--- a/example-code/sum.golden
+++ b/example-code/sum.golden
@@ -184,11 +184,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -209,11 +209,11 @@
             ]
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -246,12 +246,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 5, 
@@ -272,11 +272,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -297,11 +297,11 @@
             ]
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -334,12 +334,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 6, 
@@ -360,11 +360,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -386,11 +386,11 @@
             ]
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -424,12 +424,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 7, 
@@ -450,11 +450,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -477,11 +477,11 @@
             "x": 1
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -516,12 +516,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 8, 
@@ -542,11 +542,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -569,11 +569,11 @@
             "x": 1
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -608,12 +608,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 9, 
@@ -634,11 +634,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -661,11 +661,11 @@
             "x": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -677,16 +677,20 @@
         }, 
         {
           "frame_id": 3, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 1
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f3", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -713,12 +717,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -739,11 +743,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -766,11 +770,11 @@
             "x": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -782,16 +786,20 @@
         }, 
         {
           "frame_id": 3, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 1
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f3", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -818,12 +826,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -844,11 +852,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -871,11 +879,11 @@
             "x": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -888,17 +896,19 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 1
+            "__return__": 1, 
+            "x": 1
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f3", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -927,12 +937,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -953,11 +963,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -980,11 +990,11 @@
             "x": 1
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1019,12 +1029,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -1045,11 +1055,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1072,11 +1082,11 @@
             "x": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1088,16 +1098,20 @@
         }, 
         {
           "frame_id": 4, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 1
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f4", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -1124,12 +1138,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -1150,11 +1164,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1177,11 +1191,11 @@
             "x": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1193,16 +1207,20 @@
         }, 
         {
           "frame_id": 4, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 1
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f4", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -1229,12 +1247,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -1255,11 +1273,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1282,11 +1300,11 @@
             "x": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1299,17 +1317,19 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 2
+            "__return__": 2, 
+            "x": 1
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f4", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -1338,12 +1358,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -1364,11 +1384,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1391,11 +1411,11 @@
             "x": 2
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1430,12 +1450,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 8, 
@@ -1456,11 +1476,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1483,11 +1503,11 @@
             "x": 2
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1522,12 +1542,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 9, 
@@ -1548,11 +1568,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1575,11 +1595,11 @@
             "x": 2
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1591,16 +1611,20 @@
         }, 
         {
           "frame_id": 5, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 2
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f5", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -1627,12 +1651,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -1653,11 +1677,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1680,11 +1704,11 @@
             "x": 2
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1696,16 +1720,20 @@
         }, 
         {
           "frame_id": 5, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 2
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f5", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -1732,12 +1760,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -1758,11 +1786,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1785,11 +1813,11 @@
             "x": 2
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1802,17 +1830,19 @@
         {
           "frame_id": 5, 
           "encoded_locals": {
-            "__return__": 4
+            "__return__": 4, 
+            "x": 2
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f5", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -1841,12 +1871,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -1867,11 +1897,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1894,11 +1924,11 @@
             "x": 2
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -1933,12 +1963,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -1959,11 +1989,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -1986,11 +2016,11 @@
             "x": 2
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2002,16 +2032,20 @@
         }, 
         {
           "frame_id": 6, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 2
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f6", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -2038,12 +2072,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -2064,11 +2098,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2091,11 +2125,11 @@
             "x": 2
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2107,16 +2141,20 @@
         }, 
         {
           "frame_id": 6, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 2
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f6", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -2143,12 +2181,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -2169,11 +2207,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2196,11 +2234,11 @@
             "x": 2
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2213,17 +2251,19 @@
         {
           "frame_id": 6, 
           "encoded_locals": {
-            "__return__": 3
+            "__return__": 3, 
+            "x": 2
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f6", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -2252,12 +2292,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -2278,11 +2318,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2305,11 +2345,11 @@
             "x": 3
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2344,12 +2384,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 8, 
@@ -2370,11 +2410,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2397,11 +2437,11 @@
             "x": 3
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2436,12 +2476,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 9, 
@@ -2462,11 +2502,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2489,11 +2529,11 @@
             "x": 3
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2505,16 +2545,20 @@
         }, 
         {
           "frame_id": 7, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 3
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f7", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -2541,12 +2585,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -2567,11 +2611,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2594,11 +2638,11 @@
             "x": 3
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2610,16 +2654,20 @@
         }, 
         {
           "frame_id": 7, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 3
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f7", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -2646,12 +2694,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -2672,11 +2720,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2699,11 +2747,11 @@
             "x": 3
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2716,17 +2764,19 @@
         {
           "frame_id": 7, 
           "encoded_locals": {
-            "__return__": 9
+            "__return__": 9, 
+            "x": 3
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f7", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -2755,12 +2805,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -2781,11 +2831,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2808,11 +2858,11 @@
             "x": 3
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2847,12 +2897,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -2873,11 +2923,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -2900,11 +2950,11 @@
             "x": 3
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -2916,16 +2966,20 @@
         }, 
         {
           "frame_id": 8, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 3
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f8", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -2952,12 +3006,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -2978,11 +3032,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3005,11 +3059,11 @@
             "x": 3
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3021,16 +3075,20 @@
         }, 
         {
           "frame_id": 8, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 3
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f8", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -3057,12 +3115,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -3083,11 +3141,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3110,11 +3168,11 @@
             "x": 3
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3127,17 +3185,19 @@
         {
           "frame_id": 8, 
           "encoded_locals": {
-            "__return__": 4
+            "__return__": 4, 
+            "x": 3
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f8", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -3166,12 +3226,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -3192,11 +3252,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3219,11 +3279,11 @@
             "x": 4
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3258,12 +3318,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 8, 
@@ -3284,11 +3344,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3311,11 +3371,11 @@
             "x": 4
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3350,12 +3410,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 9, 
@@ -3376,11 +3436,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3403,11 +3463,11 @@
             "x": 4
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3419,16 +3479,20 @@
         }, 
         {
           "frame_id": 9, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 4
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f9", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -3455,12 +3519,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -3481,11 +3545,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3508,11 +3572,11 @@
             "x": 4
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3524,16 +3588,20 @@
         }, 
         {
           "frame_id": 9, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 4
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f9", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -3560,12 +3628,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -3586,11 +3654,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3613,11 +3681,11 @@
             "x": 4
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3630,17 +3698,19 @@
         {
           "frame_id": 9, 
           "encoded_locals": {
-            "__return__": 16
+            "__return__": 16, 
+            "x": 4
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f9", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -3669,12 +3739,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -3695,11 +3765,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3722,11 +3792,11 @@
             "x": 4
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3761,12 +3831,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -3787,11 +3857,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3814,11 +3884,11 @@
             "x": 4
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3830,16 +3900,20 @@
         }, 
         {
           "frame_id": 10, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 4
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f10", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -3866,12 +3940,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -3892,11 +3966,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -3919,11 +3993,11 @@
             "x": 4
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -3935,16 +4009,20 @@
         }, 
         {
           "frame_id": 10, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 4
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f10", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -3971,12 +4049,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -3997,11 +4075,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4024,11 +4102,11 @@
             "x": 4
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4041,17 +4119,19 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "__return__": 5
+            "__return__": 5, 
+            "x": 4
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f10", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -4080,12 +4160,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -4106,11 +4186,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4133,11 +4213,11 @@
             "x": 5
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4172,12 +4252,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 8, 
@@ -4198,11 +4278,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4225,11 +4305,11 @@
             "x": 5
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4264,12 +4344,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 9, 
@@ -4290,11 +4370,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4317,11 +4397,11 @@
             "x": 5
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4333,16 +4413,20 @@
         }, 
         {
           "frame_id": 11, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 5
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f11", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -4369,12 +4453,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -4395,11 +4479,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4422,11 +4506,11 @@
             "x": 5
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4438,16 +4522,20 @@
         }, 
         {
           "frame_id": 11, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 5
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f11", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -4474,12 +4562,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -4500,11 +4588,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4527,11 +4615,11 @@
             "x": 5
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4544,17 +4632,19 @@
         {
           "frame_id": 11, 
           "encoded_locals": {
-            "__return__": 25
+            "__return__": 25, 
+            "x": 5
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f11", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -4583,12 +4673,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -4609,11 +4699,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4636,11 +4726,11 @@
             "x": 5
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4675,12 +4765,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -4701,11 +4791,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4728,11 +4818,11 @@
             "x": 5
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4744,16 +4834,20 @@
         }, 
         {
           "frame_id": 12, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 5
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f12", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -4780,12 +4874,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -4806,11 +4900,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4833,11 +4927,11 @@
             "x": 5
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4849,16 +4943,20 @@
         }, 
         {
           "frame_id": 12, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 5
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f12", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -4885,12 +4983,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -4911,11 +5009,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -4938,11 +5036,11 @@
             "x": 5
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -4955,17 +5053,19 @@
         {
           "frame_id": 12, 
           "encoded_locals": {
-            "__return__": 6
+            "__return__": 6, 
+            "x": 5
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f12", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -4994,12 +5094,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -5020,11 +5120,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -5047,11 +5147,11 @@
             "x": 6
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -5086,12 +5186,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 8, 
@@ -5112,11 +5212,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -5139,11 +5239,11 @@
             "x": 6
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -5178,12 +5278,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 9, 
@@ -5204,11 +5304,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -5231,11 +5331,11 @@
             "x": 6
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -5247,16 +5347,20 @@
         }, 
         {
           "frame_id": 13, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 6
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f13", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -5283,12 +5387,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -5309,11 +5413,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -5336,11 +5440,11 @@
             "x": 6
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -5352,16 +5456,20 @@
         }, 
         {
           "frame_id": 13, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 6
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f13", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -5388,12 +5496,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -5414,11 +5522,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -5441,11 +5549,11 @@
             "x": 6
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -5458,17 +5566,19 @@
         {
           "frame_id": 13, 
           "encoded_locals": {
-            "__return__": 36
+            "__return__": 36, 
+            "x": 6
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f13", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -5497,12 +5607,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -5523,11 +5633,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -5550,11 +5660,11 @@
             "x": 6
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -5589,12 +5699,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -5615,11 +5725,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -5642,11 +5752,11 @@
             "x": 6
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -5658,16 +5768,20 @@
         }, 
         {
           "frame_id": 14, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 6
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f14", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -5694,12 +5808,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -5720,11 +5834,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -5747,11 +5861,11 @@
             "x": 6
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -5763,16 +5877,20 @@
         }, 
         {
           "frame_id": 14, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 6
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f14", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -5799,12 +5917,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -5825,11 +5943,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -5852,11 +5970,11 @@
             "x": 6
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -5869,17 +5987,19 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "__return__": 7
+            "__return__": 7, 
+            "x": 6
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f14", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -5908,12 +6028,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -5934,11 +6054,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -5961,11 +6081,11 @@
             "x": 7
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -6000,12 +6120,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 8, 
@@ -6026,11 +6146,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -6053,11 +6173,11 @@
             "x": 7
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -6092,12 +6212,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 9, 
@@ -6118,11 +6238,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -6145,11 +6265,11 @@
             "x": 7
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -6161,16 +6281,20 @@
         }, 
         {
           "frame_id": 15, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 7
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f15", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -6197,12 +6321,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -6223,11 +6347,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -6250,11 +6374,11 @@
             "x": 7
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -6266,16 +6390,20 @@
         }, 
         {
           "frame_id": 15, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 7
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f15", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -6302,12 +6430,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -6328,11 +6456,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -6355,11 +6483,11 @@
             "x": 7
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -6372,17 +6500,19 @@
         {
           "frame_id": 15, 
           "encoded_locals": {
-            "__return__": 49
+            "__return__": 49, 
+            "x": 7
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f15", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -6411,12 +6541,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -6437,11 +6567,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -6464,11 +6594,11 @@
             "x": 7
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -6503,12 +6633,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -6529,11 +6659,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -6556,11 +6686,11 @@
             "x": 7
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -6572,16 +6702,20 @@
         }, 
         {
           "frame_id": 16, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 7
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f16", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -6608,12 +6742,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -6634,11 +6768,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -6661,11 +6795,11 @@
             "x": 7
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -6677,16 +6811,20 @@
         }, 
         {
           "frame_id": 16, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 7
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f16", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -6713,12 +6851,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -6739,11 +6877,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -6766,11 +6904,11 @@
             "x": 7
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -6783,17 +6921,19 @@
         {
           "frame_id": 16, 
           "encoded_locals": {
-            "__return__": 8
+            "__return__": 8, 
+            "x": 7
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f16", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -6822,12 +6962,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -6848,11 +6988,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -6875,11 +7015,11 @@
             "x": 8
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -6914,12 +7054,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 8, 
@@ -6940,11 +7080,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -6967,11 +7107,11 @@
             "x": 8
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -7006,12 +7146,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 9, 
@@ -7032,11 +7172,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -7059,11 +7199,11 @@
             "x": 8
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -7075,16 +7215,20 @@
         }, 
         {
           "frame_id": 17, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 8
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f17", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -7111,12 +7255,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -7137,11 +7281,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -7164,11 +7308,11 @@
             "x": 8
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -7180,16 +7324,20 @@
         }, 
         {
           "frame_id": 17, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 8
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f17", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -7216,12 +7364,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -7242,11 +7390,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -7269,11 +7417,11 @@
             "x": 8
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -7286,17 +7434,19 @@
         {
           "frame_id": 17, 
           "encoded_locals": {
-            "__return__": 64
+            "__return__": 64, 
+            "x": 8
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f17", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -7325,12 +7475,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -7351,11 +7501,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -7378,11 +7528,11 @@
             "x": 8
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -7417,12 +7567,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -7443,11 +7593,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -7470,11 +7620,11 @@
             "x": 8
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -7486,16 +7636,20 @@
         }, 
         {
           "frame_id": 18, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 8
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f18", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -7522,12 +7676,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -7548,11 +7702,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -7575,11 +7729,11 @@
             "x": 8
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -7591,16 +7745,20 @@
         }, 
         {
           "frame_id": 18, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 8
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f18", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -7627,12 +7785,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -7653,11 +7811,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -7680,11 +7838,11 @@
             "x": 8
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -7697,17 +7855,19 @@
         {
           "frame_id": 18, 
           "encoded_locals": {
-            "__return__": 9
+            "__return__": 9, 
+            "x": 8
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f18", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -7736,12 +7896,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -7762,11 +7922,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -7789,11 +7949,11 @@
             "x": 9
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -7828,12 +7988,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 8, 
@@ -7854,11 +8014,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -7881,11 +8041,11 @@
             "x": 9
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -7920,12 +8080,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 9, 
@@ -7946,11 +8106,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -7973,11 +8133,11 @@
             "x": 9
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -7989,16 +8149,20 @@
         }, 
         {
           "frame_id": 19, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 9
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f19", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -8025,12 +8189,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -8051,11 +8215,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -8078,11 +8242,11 @@
             "x": 9
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -8094,16 +8258,20 @@
         }, 
         {
           "frame_id": 19, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 9
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f19", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -8130,12 +8298,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -8156,11 +8324,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -8183,11 +8351,11 @@
             "x": 9
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -8200,17 +8368,19 @@
         {
           "frame_id": 19, 
           "encoded_locals": {
-            "__return__": 81
+            "__return__": 81, 
+            "x": 9
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f19", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -8239,12 +8409,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -8265,11 +8435,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -8292,11 +8462,11 @@
             "x": 9
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -8331,12 +8501,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -8357,11 +8527,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -8384,11 +8554,11 @@
             "x": 9
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -8400,16 +8570,20 @@
         }, 
         {
           "frame_id": 20, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 9
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f20", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -8436,12 +8610,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -8462,11 +8636,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -8489,11 +8663,11 @@
             "x": 9
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -8505,16 +8679,20 @@
         }, 
         {
           "frame_id": 20, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 9
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f20", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -8541,12 +8719,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -8567,11 +8745,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -8594,11 +8772,11 @@
             "x": 9
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -8611,17 +8789,19 @@
         {
           "frame_id": 20, 
           "encoded_locals": {
-            "__return__": 10
+            "__return__": 10, 
+            "x": 9
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f20", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -8650,12 +8830,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -8676,11 +8856,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -8703,11 +8883,11 @@
             "x": 10
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -8742,12 +8922,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 8, 
@@ -8768,11 +8948,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -8795,11 +8975,11 @@
             "x": 10
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -8834,12 +9014,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 9, 
@@ -8860,11 +9040,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -8887,11 +9067,11 @@
             "x": 10
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -8903,16 +9083,20 @@
         }, 
         {
           "frame_id": 21, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 10
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f21", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -8939,12 +9123,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -8965,11 +9149,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -8992,11 +9176,11 @@
             "x": 10
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -9008,16 +9192,20 @@
         }, 
         {
           "frame_id": 21, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 10
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f21", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -9044,12 +9232,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -9070,11 +9258,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -9097,11 +9285,11 @@
             "x": 10
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -9114,17 +9302,19 @@
         {
           "frame_id": 21, 
           "encoded_locals": {
-            "__return__": 100
+            "__return__": 100, 
+            "x": 10
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f21", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -9153,12 +9343,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -9179,11 +9369,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -9206,11 +9396,11 @@
             "x": 10
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -9245,12 +9435,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 10, 
@@ -9271,11 +9461,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -9298,11 +9488,11 @@
             "x": 10
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -9314,16 +9504,20 @@
         }, 
         {
           "frame_id": 22, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 10
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f22", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -9350,12 +9544,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -9376,11 +9570,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -9403,11 +9597,11 @@
             "x": 10
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -9419,16 +9613,20 @@
         }, 
         {
           "frame_id": 22, 
-          "encoded_locals": {}, 
+          "encoded_locals": {
+            "x": 10
+          }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f22", 
-          "ordered_varnames": []
+          "ordered_varnames": [
+            "x"
+          ]
         }
       ], 
       "globals": {
@@ -9455,12 +9653,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -9481,11 +9679,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -9508,11 +9706,11 @@
             "x": 10
           }, 
           "is_highlighted": false, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -9525,17 +9723,19 @@
         {
           "frame_id": 22, 
           "encoded_locals": {
-            "__return__": 11
+            "__return__": 11, 
+            "x": 10
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "\u03bb", 
           "is_zombie": false, 
           "parent_frame_id_list": [
-            2
+            1
           ], 
           "unique_hash": "\u03bb_f22", 
           "ordered_varnames": [
+            "x", 
             "__return__"
           ]
         }
@@ -9564,12 +9764,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 14, 
@@ -9590,11 +9790,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -9617,11 +9817,11 @@
             "x": 11
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -9656,12 +9856,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 8, 
@@ -9682,11 +9882,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -9709,11 +9909,11 @@
             "x": 11
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -9748,12 +9948,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 11, 
@@ -9774,11 +9974,11 @@
             "low": 1
           }, 
           "is_highlighted": false, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high"
@@ -9802,11 +10002,11 @@
             "x": 11
           }, 
           "is_highlighted": true, 
-          "is_parent": true, 
+          "is_parent": false, 
           "func_name": "summation", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p", 
+          "unique_hash": "summation_f2", 
           "ordered_varnames": [
             "low", 
             "high", 
@@ -9842,12 +10042,12 @@
         "3": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ], 
         "4": [
           "FUNCTION", 
           "\u03bb(x)", 
-          2
+          1
         ]
       }, 
       "line": 11, 
@@ -9869,47 +10069,14 @@
             "low": 1
           }, 
           "is_highlighted": true, 
-          "is_parent": false, 
+          "is_parent": true, 
           "func_name": "sumsquares", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "sumsquares_f1", 
-          "ordered_varnames": [
-            "low", 
-            "high", 
-            "__return__"
-          ]
-        }, 
-        {
-          "frame_id": 2, 
-          "encoded_locals": {
-            "f": [
-              "REF", 
-              4
-            ], 
-            "next": [
-              "REF", 
-              3
-            ], 
-            "high": 10, 
-            "s": 385, 
-            "low": 1, 
-            "__return__": 385, 
-            "x": 11
-          }, 
-          "is_highlighted": false, 
-          "is_parent": true, 
-          "func_name": "summation", 
-          "is_zombie": true, 
-          "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p_z", 
+          "unique_hash": "sumsquares_f1_p", 
           "ordered_varnames": [
             "low", 
             "high", 
-            "f", 
-            "next", 
-            "s", 
-            "x", 
             "__return__"
           ]
         }
@@ -9934,16 +10101,6 @@
           "FUNCTION", 
           "sumsquares(low, high)", 
           null
-        ], 
-        "3": [
-          "FUNCTION", 
-          "\u03bb(x)", 
-          2
-        ], 
-        "4": [
-          "FUNCTION", 
-          "\u03bb(x)", 
-          2
         ]
       }, 
       "line": 14, 
@@ -9958,35 +10115,21 @@
       "func_name": "", 
       "stack_to_render": [
         {
-          "frame_id": 2, 
+          "frame_id": 1, 
           "encoded_locals": {
-            "f": [
-              "REF", 
-              4
-            ], 
-            "next": [
-              "REF", 
-              3
-            ], 
             "high": 10, 
-            "s": 385, 
-            "low": 1, 
             "__return__": 385, 
-            "x": 11
+            "low": 1
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
-          "func_name": "summation", 
+          "func_name": "sumsquares", 
           "is_zombie": true, 
           "parent_frame_id_list": [], 
-          "unique_hash": "summation_f2_p_z", 
+          "unique_hash": "sumsquares_f1_p_z", 
           "ordered_varnames": [
             "low", 
             "high", 
-            "f", 
-            "next", 
-            "s", 
-            "x", 
             "__return__"
           ]
         }
@@ -10011,16 +10154,6 @@
           "FUNCTION", 
           "sumsquares(low, high)", 
           null
-        ], 
-        "3": [
-          "FUNCTION", 
-          "\u03bb(x)", 
-          2
-        ], 
-        "4": [
-          "FUNCTION", 
-          "\u03bb(x)", 
-          2
         ]
       }, 
       "line": 16, 

From 85fb1f4196ab3b5e0be32ed827738c3207aa0b14 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 21 Aug 2012 14:34:31 -0700
Subject: [PATCH 146/502] fix for python 3

---
 PyTutorGAE/pg_logger.py | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index 2035ccd76..b01472af4 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -36,7 +36,9 @@
 import traceback
 import types
 
-if sys.version_info[0] == 3:
+is_python3 = (sys.version_info[0] == 3)
+
+if is_python3:
   import io as cStringIO
 else:
   import cStringIO
@@ -378,8 +380,9 @@ def create_encoded_stack_entry(cur_frame):
                 v not in self.closures and \
                 v not in self.globally_defined_funcs):
 
-              # Look for the presence of v.func_code (code object) in
-              # the constant pool (f_code.co_consts) of an enclosing
+              # Look for the presence of the code object (v.func_code
+              # for Python 2 or v.__code__ for Python 3) in the
+              # constant pool (f_code.co_consts) of an enclosing
               # stack frame, and set that frame as your parent.
               #
               # This technique properly handles lambdas passed as
@@ -396,7 +399,7 @@ def create_encoded_stack_entry(cur_frame):
                   break
 
                 for frame_const in my_frame.f_code.co_consts:
-                  if frame_const is v.func_code:
+                  if frame_const is (v.__code__ if is_python3 else v.func_code):
                     chosen_parent_frame = my_frame
                     break
 

From 72ca7f2eea3cb4efff499ec689942094ebfdcae6 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 21 Aug 2012 14:36:09 -0700
Subject: [PATCH 147/502] minor

---
 PyTutorGAE/tests/golden_test.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/PyTutorGAE/tests/golden_test.py b/PyTutorGAE/tests/golden_test.py
index 0e4288034..d936f2741 100644
--- a/PyTutorGAE/tests/golden_test.py
+++ b/PyTutorGAE/tests/golden_test.py
@@ -36,7 +36,7 @@ def execute(input_filename):
   (stdout, stderr) = Popen(PROGRAM + [input_filename], stdout=PIPE, stderr=PIPE).communicate()
 
   if stderr:
-    print '  (has stderr)'
+    print '(has stderr)'
   #  print '  stderr {'
   #  print stderr, '}'
 
@@ -115,7 +115,7 @@ def run_test(input_filename, clobber_golden=False):
   golden_file = base + '.golden'
   if os.path.isfile(golden_file):
     if golden_differs_from_out(golden_file):
-      print "  FAILED"
+      print "  FAILED!!!"
     if clobber_golden:
       clobber_golden_file(golden_file)
   else:

From 2ee19e9dd89c7e9fb37da9fc423bc512244137e0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 21 Aug 2012 14:45:18 -0700
Subject: [PATCH 148/502] housekeeping

---
 .gitignore                    | 2 ++
 PyTutorGAE/tests/example-code | 1 +
 2 files changed, 3 insertions(+)
 create mode 100644 .gitignore
 create mode 120000 PyTutorGAE/tests/example-code

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 000000000..6f3ae28da
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.out
+*.pyc
diff --git a/PyTutorGAE/tests/example-code b/PyTutorGAE/tests/example-code
new file mode 120000
index 000000000..5a6481d0b
--- /dev/null
+++ b/PyTutorGAE/tests/example-code
@@ -0,0 +1 @@
+../../example-code
\ No newline at end of file

From 898c1280a419229fc952756ccfb8926d2a2dfc3a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 21 Aug 2012 16:53:54 -0700
Subject: [PATCH 149/502] fixed bug involving john-compose.txt

---
 PyTutorGAE/pg_logger.py                       |   10 +-
 .../tests/backend-tests/john-compose.golden   | 1262 +++++++++++++++++
 .../tests/backend-tests/john-compose.txt      |    5 +
 3 files changed, 1273 insertions(+), 4 deletions(-)
 create mode 100644 PyTutorGAE/tests/backend-tests/john-compose.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/john-compose.txt

diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index b01472af4..8556c32f6 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -405,10 +405,12 @@ def create_encoded_stack_entry(cur_frame):
 
               assert chosen_parent_frame # I hope this always passes :0
 
-              self.closures[v] = chosen_parent_frame
-              self.parent_frames_set.add(chosen_parent_frame) # unequivocally add to this set!!!
-              if not chosen_parent_frame in self.zombie_frames:
-                self.zombie_frames.append(chosen_parent_frame)
+              # this condition should be False for functions declared in global scope ...
+              if chosen_parent_frame in self.frame_ordered_ids:
+                self.closures[v] = chosen_parent_frame
+                self.parent_frames_set.add(chosen_parent_frame) # unequivocally add to this set!!!
+                if not chosen_parent_frame in self.zombie_frames:
+                  self.zombie_frames.append(chosen_parent_frame)
         else:
           # if there is only a global scope visible ...
           for (k, v) in get_user_globals(top_frame).items():
diff --git a/PyTutorGAE/tests/backend-tests/john-compose.golden b/PyTutorGAE/tests/backend-tests/john-compose.golden
new file mode 100644
index 000000000..ef90915f2
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/john-compose.golden
@@ -0,0 +1,1262 @@
+{
+  "code": "def compose1(f, g):\n  return lambda x: f(g(x))\n\nadd_one_and_square = compose1(lambda x: x * x, lambda x: x + 1)\nresult = add_one_and_square(12)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "compose1"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "compose1": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "compose1(f, g)", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "compose1"
+      ], 
+      "stdout": "", 
+      "func_name": "compose1", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "g": [
+              "REF", 
+              2
+            ], 
+            "f": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "compose1", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "compose1_f1", 
+          "ordered_varnames": [
+            "f", 
+            "g"
+          ]
+        }
+      ], 
+      "globals": {
+        "compose1": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "compose1(f, g)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "compose1"
+      ], 
+      "stdout": "", 
+      "func_name": "compose1", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "g": [
+              "REF", 
+              2
+            ], 
+            "f": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "compose1", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "compose1_f1", 
+          "ordered_varnames": [
+            "f", 
+            "g"
+          ]
+        }
+      ], 
+      "globals": {
+        "compose1": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "compose1(f, g)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "compose1"
+      ], 
+      "stdout": "", 
+      "func_name": "compose1", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
+            "g": [
+              "REF", 
+              2
+            ], 
+            "f": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "compose1", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "compose1_f1_p", 
+          "ordered_varnames": [
+            "f", 
+            "g", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "compose1": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "compose1(f, g)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          1
+        ]
+      }, 
+      "line": 2, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "compose1", 
+        "add_one_and_square"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
+            "g": [
+              "REF", 
+              2
+            ], 
+            "f": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "compose1", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "compose1_f1_p_z", 
+          "ordered_varnames": [
+            "f", 
+            "g", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "compose1": [
+          "REF", 
+          1
+        ], 
+        "add_one_and_square": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "compose1(f, g)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          1
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "compose1", 
+        "add_one_and_square"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
+            "g": [
+              "REF", 
+              2
+            ], 
+            "f": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "compose1", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "compose1_f1_p_z", 
+          "ordered_varnames": [
+            "f", 
+            "g", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 12
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "\u03bb", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "\u03bb_f2", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "compose1": [
+          "REF", 
+          1
+        ], 
+        "add_one_and_square": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "compose1(f, g)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          1
+        ]
+      }, 
+      "line": 2, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "compose1", 
+        "add_one_and_square"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
+            "g": [
+              "REF", 
+              2
+            ], 
+            "f": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "compose1", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "compose1_f1_p_z", 
+          "ordered_varnames": [
+            "f", 
+            "g", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 12
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "\u03bb", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "\u03bb_f2", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "compose1": [
+          "REF", 
+          1
+        ], 
+        "add_one_and_square": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "compose1(f, g)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          1
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "compose1", 
+        "add_one_and_square"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
+            "g": [
+              "REF", 
+              2
+            ], 
+            "f": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "compose1", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "compose1_f1_p_z", 
+          "ordered_varnames": [
+            "f", 
+            "g", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 12
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "\u03bb", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "\u03bb_f2", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "x": 12
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "\u03bb", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "\u03bb_f3", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "compose1": [
+          "REF", 
+          1
+        ], 
+        "add_one_and_square": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "compose1(f, g)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          1
+        ]
+      }, 
+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "compose1", 
+        "add_one_and_square"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
+            "g": [
+              "REF", 
+              2
+            ], 
+            "f": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "compose1", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "compose1_f1_p_z", 
+          "ordered_varnames": [
+            "f", 
+            "g", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 12
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "\u03bb", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "\u03bb_f2", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "x": 12
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "\u03bb", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "\u03bb_f3", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "compose1": [
+          "REF", 
+          1
+        ], 
+        "add_one_and_square": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "compose1(f, g)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          1
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "compose1", 
+        "add_one_and_square"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
+            "g": [
+              "REF", 
+              2
+            ], 
+            "f": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "compose1", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "compose1_f1_p_z", 
+          "ordered_varnames": [
+            "f", 
+            "g", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 12
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "\u03bb", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "\u03bb_f2", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "__return__": 13, 
+            "x": 12
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "\u03bb", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "\u03bb_f3", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "compose1": [
+          "REF", 
+          1
+        ], 
+        "add_one_and_square": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "compose1(f, g)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          1
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }, 
+    {
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+        "add_one_and_square"
+      ], 
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+      "stack_to_render": [
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+          "frame_id": 1, 
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+          "ordered_varnames": [
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+          ]
+        }
+      ], 
+      "globals": {
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+          1
+        ], 
+        "add_one_and_square": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
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+          "\u03bb(x)", 
+          1
+        ]
+      }, 
+      "line": 4, 
+      "event": "call"
+    }, 
+    {
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+        "compose1", 
+        "add_one_and_square"
+      ], 
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+      "func_name": "", 
+      "stack_to_render": [
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+              3
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+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "compose1_f1_p_z", 
+          "ordered_varnames": [
+            "f", 
+            "g", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 12
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "\u03bb", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "\u03bb_f2", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }, 
+        {
+          "frame_id": 4, 
+          "encoded_locals": {
+            "x": 13
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "\u03bb", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "\u03bb_f4", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "compose1": [
+          "REF", 
+          1
+        ], 
+        "add_one_and_square": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "compose1(f, g)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          1
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "compose1", 
+        "add_one_and_square"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
+            "g": [
+              "REF", 
+              2
+            ], 
+            "f": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "compose1", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "compose1_f1_p_z", 
+          "ordered_varnames": [
+            "f", 
+            "g", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 12
+          }, 
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+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "\u03bb_f2", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }, 
+        {
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+          }, 
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+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "\u03bb_f4", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "compose1": [
+          "REF", 
+          1
+        ], 
+        "add_one_and_square": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "compose1(f, g)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          1
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "compose1", 
+        "add_one_and_square"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
+            "g": [
+              "REF", 
+              2
+            ], 
+            "f": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "compose1", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "compose1_f1_p_z", 
+          "ordered_varnames": [
+            "f", 
+            "g", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": 169, 
+            "x": 12
+          }, 
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+          "is_parent": false, 
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+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
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+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "compose1": [
+          "REF", 
+          1
+        ], 
+        "add_one_and_square": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "compose1(f, g)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          1
+        ]
+      }, 
+      "line": 2, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "compose1", 
+        "add_one_and_square", 
+        "result"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
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+              "REF", 
+              2
+            ], 
+            "f": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "compose1", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "compose1_f1_p_z", 
+          "ordered_varnames": [
+            "f", 
+            "g", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "compose1": [
+          "REF", 
+          1
+        ], 
+        "add_one_and_square": [
+          "REF", 
+          4
+        ], 
+        "result": 169
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "compose1(f, g)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "\u03bb(x)", 
+          1
+        ]
+      }, 
+      "line": 5, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/john-compose.txt b/PyTutorGAE/tests/backend-tests/john-compose.txt
new file mode 100644
index 000000000..4b8767912
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/john-compose.txt
@@ -0,0 +1,5 @@
+def compose1(f, g):
+  return lambda x: f(g(x))
+
+add_one_and_square = compose1(lambda x: x * x, lambda x: x + 1)
+result = add_one_and_square(12)

From 1c3a2d672d8fb5cafb82b9f5d2f4727e7b337c86 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 22 Aug 2012 12:18:55 -0700
Subject: [PATCH 150/502] started adding a Google App Engine logger

---
 PyTutorGAE/logger/gae_logger.py | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 PyTutorGAE/logger/gae_logger.py

diff --git a/PyTutorGAE/logger/gae_logger.py b/PyTutorGAE/logger/gae_logger.py
new file mode 100644
index 000000000..12a8d7ba8
--- /dev/null
+++ b/PyTutorGAE/logger/gae_logger.py
@@ -0,0 +1,18 @@
+# User activity logger to be deployed on Google App Engine datastore
+
+import datetime
+from google.appengine.ext import db
+
+
+class VisualizerRequest(db.Model):
+  user_script = db.TextProperty(required=True) # LONG string
+  cumulative_mode = db.BooleanProperty(requred=True)
+  user_ip_addr = db.StringProperty(required=True)
+  request_timestamp = db.DateTimeProperty(auto_now_add=True) # always set timestamp to NOW!
+
+x = VisualizerRequest(user_script=db.Text(u'print "hello world"\n', encoding='utf_8'),
+                      cumulative_mode=True
+                      user_ip_addr='18.239.4.100')
+
+x.put()
+

From bc123867e30224431f2412e4de60ceca07c7a955 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 22 Aug 2012 12:21:02 -0700
Subject: [PATCH 151/502] add http referer too

---
 PyTutorGAE/logger/gae_logger.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/PyTutorGAE/logger/gae_logger.py b/PyTutorGAE/logger/gae_logger.py
index 12a8d7ba8..ef1c083f0 100644
--- a/PyTutorGAE/logger/gae_logger.py
+++ b/PyTutorGAE/logger/gae_logger.py
@@ -8,11 +8,13 @@ class VisualizerRequest(db.Model):
   user_script = db.TextProperty(required=True) # LONG string
   cumulative_mode = db.BooleanProperty(requred=True)
   user_ip_addr = db.StringProperty(required=True)
+  http_referer = db.StringProperty(required=True)
   request_timestamp = db.DateTimeProperty(auto_now_add=True) # always set timestamp to NOW!
 
 x = VisualizerRequest(user_script=db.Text(u'print "hello world"\n', encoding='utf_8'),
                       cumulative_mode=True
-                      user_ip_addr='18.239.4.100')
+                      user_ip_addr='18.239.4.100',
+                      http_referer='http://www.google.com/?magic-search')
 
 x.put()
 

From 2da6b0b403016ec38d3604854831395d400f5713 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 22 Aug 2012 19:53:28 -0700
Subject: [PATCH 152/502] do some sandboxing but still allow evals

---
 PyTutorGAE/pg_logger.py                       |   16 +-
 .../backend-tests/john-import-test.golden     | 5648 +++++++++++++++++
 .../tests/backend-tests/john-import-test.txt  |   21 +
 3 files changed, 5676 insertions(+), 9 deletions(-)
 create mode 100644 PyTutorGAE/tests/backend-tests/john-import-test.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/john-import-test.txt

diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index 8556c32f6..ee915007a 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -553,28 +553,26 @@ def _runscript(self, script_str):
         self._wait_for_mainpyfile = 1
 
 
-        # I think Google App Engine takes care of sandboxing, but maybe
-        # we should do some extra sandboxing ourselves ...
-        '''
         # ok, let's try to sorta 'sandbox' the user script by not
-        # allowing certain potentially dangerous operations:
+        # allowing certain potentially dangerous operations.
+        #
+        # (Note that we still allow imports and let App Engine take care
+        # of sandboxing those appropriately.)
         user_builtins = {}
         for (k,v) in __builtins__.iteritems():
           if k in ('reload', 'input', 'apply', 'open', 'compile',
-                   '__import__', 'file', 'eval', 'execfile',
+                   'file', 'eval', 'execfile',
                    'exit', 'quit', 'raw_input',
-                   'dir', 'globals', 'locals', 'vars',
-                   'compile'):
+                   'dir', 'globals', 'locals', 'vars'):
             continue
           user_builtins[k] = v
-        '''
 
 
         user_stdout = cStringIO.StringIO()
 
         sys.stdout = user_stdout
         user_globals = {"__name__"    : "__main__",
-                        "__builtins__" : __builtins__,
+                        "__builtins__" : user_builtins,
                         "__user_stdout__" : user_stdout}
 
         try:
diff --git a/PyTutorGAE/tests/backend-tests/john-import-test.golden b/PyTutorGAE/tests/backend-tests/john-import-test.golden
new file mode 100644
index 000000000..642221fcd
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/john-import-test.golden
@@ -0,0 +1,5648 @@
+{
+  "code": "from collections import OrderedDict\nfrom datetime import datetime\nfrom json import JSONDecoder\nfrom math import pi\nfrom math import sin, cos, atan2, radians, sqrt\nfrom random import randint\nimport code\nimport doctest\nimport functools\nimport inspect\nimport io\nimport math\nimport operator as op\nimport os\nimport random\nimport re\nimport signal\nimport string\nimport sys\nimport unittest\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "OrderedDict", 
+        "__package__"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "OrderedDict": [
+          "REF", 
+          1
+        ], 
+        "__package__": null
+      }, 
+      "heap": {
+        "1": [
+          "INSTANCE", 
+          "ABCMeta", 
+          [
+            "__abstractmethods__", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "__delitem__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__eq__", 
+            [
+              "REF", 
+              4
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__iter__", 
+            [
+              "REF", 
+              6
+            ]
+          ], 
+          [
+            "__ne__", 
+            [
+              "REF", 
+              7
+            ]
+          ], 
+          [
+            "__reduce__", 
+            [
+              "REF", 
+              8
+            ]
+          ], 
+          [
+            "__repr__", 
+            [
+              "REF", 
+              9
+            ]
+          ], 
+          [
+            "__reversed__", 
+            [
+              "REF", 
+              10
+            ]
+          ], 
+          [
+            "__setitem__", 
+            [
+              "REF", 
+              11
+            ]
+          ], 
+          [
+            "_abc_cache", 
+            [
+              "REF", 
+              12
+            ]
+          ], 
+          [
+            "_abc_negative_cache", 
+            [
+              "REF", 
+              17
+            ]
+          ], 
+          [
+            "_abc_negative_cache_version", 
+            10
+          ], 
+          [
+            "_abc_registry", 
+            [
+              "REF", 
+              22
+            ]
+          ], 
+          [
+            "clear", 
+            [
+              "REF", 
+              27
+            ]
+          ], 
+          [
+            "copy", 
+            [
+              "REF", 
+              28
+            ]
+          ], 
+          [
+            "fromkeys", 
+            [
+              "REF", 
+              29
+            ]
+          ], 
+          [
+            "items", 
+            [
+              "REF", 
+              30
+            ]
+          ], 
+          [
+            "iteritems", 
+            [
+              "REF", 
+              31
+            ]
+          ], 
+          [
+            "iterkeys", 
+            [
+              "REF", 
+              32
+            ]
+          ], 
+          [
+            "itervalues", 
+            [
+              "REF", 
+              33
+            ]
+          ], 
+          [
+            "keys", 
+            [
+              "REF", 
+              34
+            ]
+          ], 
+          [
+            "pop", 
+            [
+              "REF", 
+              35
+            ]
+          ], 
+          [
+            "popitem", 
+            [
+              "REF", 
+              36
+            ]
+          ], 
+          [
+            "setdefault", 
+            [
+              "REF", 
+              37
+            ]
+          ], 
+          [
+            "update", 
+            [
+              "REF", 
+              38
+            ]
+          ], 
+          [
+            "values", 
+            [
+              "REF", 
+              39
+            ]
+          ], 
+          [
+            "viewitems", 
+            [
+              "REF", 
+              40
+            ]
+          ], 
+          [
+            "viewkeys", 
+            [
+              "REF", 
+              41
+            ]
+          ], 
+          [
+            "viewvalues", 
+            [
+              "REF", 
+              42
+            ]
+          ]
+        ], 
+        "2": [
+          "frozenset", 
+          "frozenset([])"
+        ], 
+        "3": [
+          "FUNCTION", 
+          "__delitem__(self, key, PREV, NEXT, dict_delitem)", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "__eq__(self, other)", 
+          null
+        ], 
+        "5": [
+          "FUNCTION", 
+          "__init__(self, *a, *r, *g, *s, **k, **w, **d, **s)", 
+          null
+        ], 
+        "6": [
+          "FUNCTION", 
+          "__iter__(self, NEXT, KEY)", 
+          null
+        ], 
+        "7": [
+          "FUNCTION", 
+          "__ne__(self, other)", 
+          null
+        ], 
+        "8": [
+          "FUNCTION", 
+          "__reduce__(self)", 
+          null
+        ], 
+        "9": [
+          "FUNCTION", 
+          "__repr__(self)", 
+          null
+        ], 
+        "10": [
+          "FUNCTION", 
+          "__reversed__(self, PREV, KEY)", 
+          null
+        ], 
+        "11": [
+          "FUNCTION", 
+          "__setitem__(self, key, value, PREV, NEXT, dict_setitem)", 
+          null
+        ], 
+        "12": [
+          "INSTANCE", 
+          "WeakSet", 
+          [
+            "_iterating", 
+            [
+              "REF", 
+              13
+            ]
+          ], 
+          [
+            "_pending_removals", 
+            [
+              "REF", 
+              14
+            ]
+          ], 
+          [
+            "_remove", 
+            [
+              "REF", 
+              15
+            ]
+          ], 
+          [
+            "data", 
+            [
+              "REF", 
+              16
+            ]
+          ]
+        ], 
+        "13": [
+          "SET"
+        ], 
+        "14": [
+          "LIST"
+        ], 
+        "15": [
+          "FUNCTION", 
+          "_remove(item, selfref)", 
+          null
+        ], 
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+          "builtin_function_or_method", 
+          ""
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+          ""
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+          ""
+        ], 
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+          ""
+        ], 
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+          ""
+        ], 
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+          ""
+        ], 
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+          ""
+        ], 
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+        ], 
+        "68": [
+          "datetime.datetime", 
+          "9999-12-31 23:59:59.999999"
+        ], 
+        "69": [
+          "getset_descriptor", 
+          ""
+        ], 
+        "70": [
+          "datetime.datetime", 
+          "0001-01-01 00:00:00"
+        ], 
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+          ""
+        ], 
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+        ], 
+        "73": [
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+          ""
+        ], 
+        "74": [
+          "datetime.timedelta", 
+          "0:00:00.000001"
+        ], 
+        "75": [
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+          ""
+        ], 
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+          "classmethod_descriptor", 
+          ""
+        ], 
+        "77": [
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+          ""
+        ], 
+        "78": [
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+          ""
+        ], 
+        "79": [
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+        ], 
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+          ""
+        ], 
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+          ""
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+        "84": [
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+          ""
+        ], 
+        "85": [
+          "method_descriptor", 
+          ""
+        ], 
+        "86": [
+          "CLASS", 
+          "JSONDecoder", 
+          [], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              87
+            ]
+          ], 
+          [
+            "decode", 
+            [
+              "REF", 
+              88
+            ]
+          ], 
+          [
+            "raw_decode", 
+            [
+              "REF", 
+              89
+            ]
+          ]
+        ], 
+        "87": [
+          "FUNCTION", 
+          "__init__(self, encoding, object_hook, parse_float, parse_int, parse_constant, strict, object_pairs_hook)", 
+          null
+        ], 
+        "88": [
+          "FUNCTION", 
+          "decode(self, s, _w)", 
+          null
+        ], 
+        "89": [
+          "FUNCTION", 
+          "raw_decode(self, s, idx)", 
+          null
+        ], 
+        "90": [
+          "builtin_function_or_method", 
+          ""
+        ], 
+        "91": [
+          "builtin_function_or_method", 
+          ""
+        ], 
+        "92": [
+          "builtin_function_or_method", 
+          ""
+        ], 
+        "93": [
+          "builtin_function_or_method", 
+          ""
+        ], 
+        "94": [
+          "builtin_function_or_method", 
+          ""
+        ]
+      }, 
+      "line": 6, 
+      "event": "exception"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/john-import-test.txt b/PyTutorGAE/tests/backend-tests/john-import-test.txt
new file mode 100644
index 000000000..86746d336
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/john-import-test.txt
@@ -0,0 +1,21 @@
+from collections import OrderedDict
+from datetime import datetime
+from json import JSONDecoder
+from math import pi
+from math import sin, cos, atan2, radians, sqrt
+from random import randint
+import code
+import doctest
+import functools
+import inspect
+import io
+import math
+import operator as op
+import os
+import random
+import re
+import signal
+import string
+import sys
+import unittest
+

From f9792b856dca08b5d0b21cbc6dd757f7a8b6bdb1 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 22 Aug 2012 21:16:59 -0700
Subject: [PATCH 153/502] test change

---
 .../backend-tests/john-import-test.golden     | 5572 +----------------
 .../tests/backend-tests/john-import-test.txt  |   26 +-
 2 files changed, 117 insertions(+), 5481 deletions(-)

diff --git a/PyTutorGAE/tests/backend-tests/john-import-test.golden b/PyTutorGAE/tests/backend-tests/john-import-test.golden
index 642221fcd..9483d42d3 100644
--- a/PyTutorGAE/tests/backend-tests/john-import-test.golden
+++ b/PyTutorGAE/tests/backend-tests/john-import-test.golden
@@ -1,5 +1,5 @@
 {
-  "code": "from collections import OrderedDict\nfrom datetime import datetime\nfrom json import JSONDecoder\nfrom math import pi\nfrom math import sin, cos, atan2, radians, sqrt\nfrom random import randint\nimport code\nimport doctest\nimport functools\nimport inspect\nimport io\nimport math\nimport operator as op\nimport os\nimport random\nimport re\nimport signal\nimport string\nimport sys\nimport unittest\n\n", 
+  "code": "import math\nimport operator\nimport string\nimport collections\nimport re\nimport json\n\n# these don't seem allowed by bdb in Python 2.6, so punt for now\n#import random\n#import datetime\n#import functools\n", 
   "trace": [
     {
       "ordered_globals": [], 
@@ -13,14 +13,14 @@
     }, 
     {
       "ordered_globals": [
-        "OrderedDict", 
+        "math", 
         "__package__"
       ], 
       "stdout": "", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
-        "OrderedDict": [
+        "math": [
           "REF", 
           1
         ], 
@@ -28,481 +28,8 @@
       }, 
       "heap": {
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-            ]
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-            ]
-          ], 
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-            10
-          ], 
-          [
-            "_abc_registry", 
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-            ]
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+          "module", 
+          ""
         ]
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@@ -510,19 +37,19 @@
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+        "math", 
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+        "operator"
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+          2
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@@ -530,950 +57,12 @@
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@@ -2498,1018 +112,50 @@
     }, 
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         "__package__", 
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+          4
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@@ -3517,1063 +163,59 @@
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@@ -4581,1068 +223,72 @@
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       "heap": {
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-          "INSTANCE", 
-          "ABCMeta", 
-          [
-            "__abstractmethods__", 
-            [
-              "REF", 
-              2
-            ]
-          ], 
-          [
-            "__delitem__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__eq__", 
-            [
-              "REF", 
-              4
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__iter__", 
-            [
-              "REF", 
-              6
-            ]
-          ], 
-          [
-            "__ne__", 
-            [
-              "REF", 
-              7
-            ]
-          ], 
-          [
-            "__reduce__", 
-            [
-              "REF", 
-              8
-            ]
-          ], 
-          [
-            "__repr__", 
-            [
-              "REF", 
-              9
-            ]
-          ], 
-          [
-            "__reversed__", 
-            [
-              "REF", 
-              10
-            ]
-          ], 
-          [
-            "__setitem__", 
-            [
-              "REF", 
-              11
-            ]
-          ], 
-          [
-            "_abc_cache", 
-            [
-              "REF", 
-              12
-            ]
-          ], 
-          [
-            "_abc_negative_cache", 
-            [
-              "REF", 
-              17
-            ]
-          ], 
-          [
-            "_abc_negative_cache_version", 
-            10
-          ], 
-          [
-            "_abc_registry", 
-            [
-              "REF", 
-              22
-            ]
-          ], 
-          [
-            "clear", 
-            [
-              "REF", 
-              27
-            ]
-          ], 
-          [
-            "copy", 
-            [
-              "REF", 
-              28
-            ]
-          ], 
-          [
-            "fromkeys", 
-            [
-              "REF", 
-              29
-            ]
-          ], 
-          [
-            "items", 
-            [
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-              30
-            ]
-          ], 
-          [
-            "iteritems", 
-            [
-              "REF", 
-              31
-            ]
-          ], 
-          [
-            "iterkeys", 
-            [
-              "REF", 
-              32
-            ]
-          ], 
-          [
-            "itervalues", 
-            [
-              "REF", 
-              33
-            ]
-          ], 
-          [
-            "keys", 
-            [
-              "REF", 
-              34
-            ]
-          ], 
-          [
-            "pop", 
-            [
-              "REF", 
-              35
-            ]
-          ], 
-          [
-            "popitem", 
-            [
-              "REF", 
-              36
-            ]
-          ], 
-          [
-            "setdefault", 
-            [
-              "REF", 
-              37
-            ]
-          ], 
-          [
-            "update", 
-            [
-              "REF", 
-              38
-            ]
-          ], 
-          [
-            "values", 
-            [
-              "REF", 
-              39
-            ]
-          ], 
-          [
-            "viewitems", 
-            [
-              "REF", 
-              40
-            ]
-          ], 
-          [
-            "viewkeys", 
-            [
-              "REF", 
-              41
-            ]
-          ], 
-          [
-            "viewvalues", 
-            [
-              "REF", 
-              42
-            ]
-          ]
+          "module", 
+          ""
         ], 
         "2": [
-          "frozenset", 
-          "frozenset([])"
+          "module", 
+          ""
         ], 
         "3": [
-          "FUNCTION", 
-          "__delitem__(self, key, PREV, NEXT, dict_delitem)", 
-          null
+          "module", 
+          ""
         ], 
         "4": [
-          "FUNCTION", 
-          "__eq__(self, other)", 
-          null
+          "module", 
+          ""
         ], 
         "5": [
-          "FUNCTION", 
-          "__init__(self, *a, *r, *g, *s, **k, **w, **d, **s)", 
-          null
+          "module", 
+          ""
         ], 
         "6": [
-          "FUNCTION", 
-          "__iter__(self, NEXT, KEY)", 
-          null
-        ], 
-        "7": [
-          "FUNCTION", 
-          "__ne__(self, other)", 
-          null
-        ], 
-        "8": [
-          "FUNCTION", 
-          "__reduce__(self)", 
-          null
-        ], 
-        "9": [
-          "FUNCTION", 
-          "__repr__(self)", 
-          null
-        ], 
-        "10": [
-          "FUNCTION", 
-          "__reversed__(self, PREV, KEY)", 
-          null
-        ], 
-        "11": [
-          "FUNCTION", 
-          "__setitem__(self, key, value, PREV, NEXT, dict_setitem)", 
-          null
-        ], 
-        "12": [
-          "INSTANCE", 
-          "WeakSet", 
-          [
-            "_iterating", 
-            [
-              "REF", 
-              13
-            ]
-          ], 
-          [
-            "_pending_removals", 
-            [
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-              14
-            ]
-          ], 
-          [
-            "_remove", 
-            [
-              "REF", 
-              15
-            ]
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-          [
-            "data", 
-            [
-              "REF", 
-              16
-            ]
-          ]
-        ], 
-        "13": [
-          "SET"
-        ], 
-        "14": [
-          "LIST"
-        ], 
-        "15": [
-          "FUNCTION", 
-          "_remove(item, selfref)", 
-          null
-        ], 
-        "16": [
-          "SET"
-        ], 
-        "17": [
-          "INSTANCE", 
-          "WeakSet", 
-          [
-            "_iterating", 
-            [
-              "REF", 
-              18
-            ]
-          ], 
-          [
-            "_pending_removals", 
-            [
-              "REF", 
-              19
-            ]
-          ], 
-          [
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-            [
-              "REF", 
-              20
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-            "data", 
-            [
-              "REF", 
-              21
-            ]
-          ]
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-          "SET"
-        ], 
-        "19": [
-          "LIST"
-        ], 
-        "20": [
-          "FUNCTION", 
-          "_remove(item, selfref)", 
-          null
-        ], 
-        "21": [
-          "SET"
-        ], 
-        "22": [
-          "INSTANCE", 
-          "WeakSet", 
-          [
-            "_iterating", 
-            [
-              "REF", 
-              23
-            ]
-          ], 
-          [
-            "_pending_removals", 
-            [
-              "REF", 
-              24
-            ]
-          ], 
-          [
-            "_remove", 
-            [
-              "REF", 
-              25
-            ]
-          ], 
-          [
-            "data", 
-            [
-              "REF", 
-              26
-            ]
-          ]
-        ], 
-        "23": [
-          "SET"
-        ], 
-        "24": [
-          "LIST"
-        ], 
-        "25": [
-          "FUNCTION", 
-          "_remove(item, selfref)", 
-          null
-        ], 
-        "26": [
-          "SET"
-        ], 
-        "27": [
-          "FUNCTION", 
-          "clear(self)", 
-          null
-        ], 
-        "28": [
-          "FUNCTION", 
-          "copy(self)", 
-          null
-        ], 
-        "29": [
-          "classmethod", 
-          ""
-        ], 
-        "30": [
-          "FUNCTION", 
-          "items(self)", 
-          null
-        ], 
-        "31": [
-          "FUNCTION", 
-          "iteritems(self)", 
-          null
-        ], 
-        "32": [
-          "FUNCTION", 
-          "iterkeys(self)", 
-          null
-        ], 
-        "33": [
-          "FUNCTION", 
-          "itervalues(self)", 
-          null
-        ], 
-        "34": [
-          "FUNCTION", 
-          "keys(self)", 
-          null
-        ], 
-        "35": [
-          "FUNCTION", 
-          "pop(self, key, default)", 
-          null
-        ], 
-        "36": [
-          "FUNCTION", 
-          "popitem(self, last)", 
-          null
-        ], 
-        "37": [
-          "FUNCTION", 
-          "setdefault(self, key, default)", 
-          null
-        ], 
-        "38": [
-          "FUNCTION", 
-          "update(*a, *r, *g, *s, **k, **w, **d, **s)", 
-          null
-        ], 
-        "39": [
-          "FUNCTION", 
-          "values(self)", 
-          null
-        ], 
-        "40": [
-          "FUNCTION", 
-          "viewitems(self)", 
-          null
-        ], 
-        "41": [
-          "FUNCTION", 
-          "viewkeys(self)", 
-          null
-        ], 
-        "42": [
-          "FUNCTION", 
-          "viewvalues(self)", 
-          null
-        ], 
-        "43": [
-          "CLASS", 
-          "datetime", 
-          [
-            "date"
-          ], 
-          [
-            "__add__", 
-            [
-              "REF", 
-              44
-            ]
-          ], 
-          [
-            "__eq__", 
-            [
-              "REF", 
-              45
-            ]
-          ], 
-          [
-            "__ge__", 
-            [
-              "REF", 
-              46
-            ]
-          ], 
-          [
-            "__getattribute__", 
-            [
-              "REF", 
-              47
-            ]
-          ], 
-          [
-            "__gt__", 
-            [
-              "REF", 
-              48
-            ]
-          ], 
-          [
-            "__hash__", 
-            [
-              "REF", 
-              49
-            ]
-          ], 
-          [
-            "__le__", 
-            [
-              "REF", 
-              50
-            ]
-          ], 
-          [
-            "__lt__", 
-            [
-              "REF", 
-              51
-            ]
-          ], 
-          [
-            "__ne__", 
-            [
-              "REF", 
-              52
-            ]
-          ], 
-          [
-            "__new__", 
-            [
-              "REF", 
-              53
-            ]
-          ], 
-          [
-            "__radd__", 
-            [
-              "REF", 
-              54
-            ]
-          ], 
-          [
-            "__reduce__", 
-            [
-              "REF", 
-              55
-            ]
-          ], 
-          [
-            "__repr__", 
-            [
-              "REF", 
-              56
-            ]
-          ], 
-          [
-            "__rsub__", 
-            [
-              "REF", 
-              57
-            ]
-          ], 
-          [
-            "__str__", 
-            [
-              "REF", 
-              58
-            ]
-          ], 
-          [
-            "__sub__", 
-            [
-              "REF", 
-              59
-            ]
-          ], 
-          [
-            "astimezone", 
-            [
-              "REF", 
-              60
-            ]
-          ], 
-          [
-            "combine", 
-            [
-              "REF", 
-              61
-            ]
-          ], 
-          [
-            "ctime", 
-            [
-              "REF", 
-              62
-            ]
-          ], 
-          [
-            "date", 
-            [
-              "REF", 
-              63
-            ]
-          ], 
-          [
-            "dst", 
-            [
-              "REF", 
-              64
-            ]
-          ], 
-          [
-            "fromtimestamp", 
-            [
-              "REF", 
-              65
-            ]
-          ], 
-          [
-            "hour", 
-            [
-              "REF", 
-              66
-            ]
-          ], 
-          [
-            "isoformat", 
-            [
-              "REF", 
-              67
-            ]
-          ], 
-          [
-            "max", 
-            [
-              "REF", 
-              68
-            ]
-          ], 
-          [
-            "microsecond", 
-            [
-              "REF", 
-              69
-            ]
-          ], 
-          [
-            "min", 
-            [
-              "REF", 
-              70
-            ]
-          ], 
-          [
-            "minute", 
-            [
-              "REF", 
-              71
-            ]
-          ], 
-          [
-            "now", 
-            [
-              "REF", 
-              72
-            ]
-          ], 
-          [
-            "replace", 
-            [
-              "REF", 
-              73
-            ]
-          ], 
-          [
-            "resolution", 
-            [
-              "REF", 
-              74
-            ]
-          ], 
-          [
-            "second", 
-            [
-              "REF", 
-              75
-            ]
-          ], 
-          [
-            "strptime", 
-            [
-              "REF", 
-              76
-            ]
-          ], 
-          [
-            "time", 
-            [
-              "REF", 
-              77
-            ]
-          ], 
-          [
-            "timetuple", 
-            [
-              "REF", 
-              78
-            ]
-          ], 
-          [
-            "timetz", 
-            [
-              "REF", 
-              79
-            ]
-          ], 
-          [
-            "tzinfo", 
-            [
-              "REF", 
-              80
-            ]
-          ], 
-          [
-            "tzname", 
-            [
-              "REF", 
-              81
-            ]
-          ], 
-          [
-            "utcfromtimestamp", 
-            [
-              "REF", 
-              82
-            ]
-          ], 
-          [
-            "utcnow", 
-            [
-              "REF", 
-              83
-            ]
-          ], 
-          [
-            "utcoffset", 
-            [
-              "REF", 
-              84
-            ]
-          ], 
-          [
-            "utctimetuple", 
-            [
-              "REF", 
-              85
-            ]
-          ]
-        ], 
-        "44": [
-          "wrapper_descriptor", 
-          ""
-        ], 
-        "45": [
-          "wrapper_descriptor", 
-          ""
-        ], 
-        "46": [
-          "wrapper_descriptor", 
-          ""
-        ], 
-        "47": [
-          "wrapper_descriptor", 
-          ""
-        ], 
-        "48": [
-          "wrapper_descriptor", 
-          ""
-        ], 
-        "49": [
-          "wrapper_descriptor", 
-          ""
-        ], 
-        "50": [
-          "wrapper_descriptor", 
-          ""
-        ], 
-        "51": [
-          "wrapper_descriptor", 
-          ""
-        ], 
-        "52": [
-          "wrapper_descriptor", 
-          ""
-        ], 
-        "53": [
-          "builtin_function_or_method", 
-          ""
-        ], 
-        "54": [
-          "wrapper_descriptor", 
-          ""
-        ], 
-        "55": [
-          "method_descriptor", 
-          ""
-        ], 
-        "56": [
-          "wrapper_descriptor", 
-          ""
-        ], 
-        "57": [
-          "wrapper_descriptor", 
-          ""
-        ], 
-        "58": [
-          "wrapper_descriptor", 
-          ""
-        ], 
-        "59": [
-          "wrapper_descriptor", 
-          ""
-        ], 
-        "60": [
-          "method_descriptor", 
-          ""
-        ], 
-        "61": [
-          "classmethod_descriptor", 
-          ""
-        ], 
-        "62": [
-          "method_descriptor", 
-          ""
-        ], 
-        "63": [
-          "method_descriptor", 
-          ""
-        ], 
-        "64": [
-          "method_descriptor", 
-          ""
-        ], 
-        "65": [
-          "classmethod_descriptor", 
-          ""
-        ], 
-        "66": [
-          "getset_descriptor", 
-          ""
-        ], 
-        "67": [
-          "method_descriptor", 
-          ""
-        ], 
-        "68": [
-          "datetime.datetime", 
-          "9999-12-31 23:59:59.999999"
-        ], 
-        "69": [
-          "getset_descriptor", 
-          ""
-        ], 
-        "70": [
-          "datetime.datetime", 
-          "0001-01-01 00:00:00"
-        ], 
-        "71": [
-          "getset_descriptor", 
-          ""
-        ], 
-        "72": [
-          "classmethod_descriptor", 
-          ""
-        ], 
-        "73": [
-          "method_descriptor", 
-          ""
-        ], 
-        "74": [
-          "datetime.timedelta", 
-          "0:00:00.000001"
-        ], 
-        "75": [
-          "getset_descriptor", 
-          ""
-        ], 
-        "76": [
-          "classmethod_descriptor", 
-          ""
-        ], 
-        "77": [
-          "method_descriptor", 
-          ""
-        ], 
-        "78": [
-          "method_descriptor", 
-          ""
-        ], 
-        "79": [
-          "method_descriptor", 
-          ""
-        ], 
-        "80": [
-          "getset_descriptor", 
-          ""
-        ], 
-        "81": [
-          "method_descriptor", 
-          ""
-        ], 
-        "82": [
-          "classmethod_descriptor", 
-          ""
-        ], 
-        "83": [
-          "classmethod_descriptor", 
-          ""
-        ], 
-        "84": [
-          "method_descriptor", 
-          ""
-        ], 
-        "85": [
-          "method_descriptor", 
-          ""
-        ], 
-        "86": [
-          "CLASS", 
-          "JSONDecoder", 
-          [], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              87
-            ]
-          ], 
-          [
-            "decode", 
-            [
-              "REF", 
-              88
-            ]
-          ], 
-          [
-            "raw_decode", 
-            [
-              "REF", 
-              89
-            ]
-          ]
-        ], 
-        "87": [
-          "FUNCTION", 
-          "__init__(self, encoding, object_hook, parse_float, parse_int, parse_constant, strict, object_pairs_hook)", 
-          null
-        ], 
-        "88": [
-          "FUNCTION", 
-          "decode(self, s, _w)", 
-          null
-        ], 
-        "89": [
-          "FUNCTION", 
-          "raw_decode(self, s, idx)", 
-          null
-        ], 
-        "90": [
-          "builtin_function_or_method", 
-          ""
-        ], 
-        "91": [
-          "builtin_function_or_method", 
-          ""
-        ], 
-        "92": [
-          "builtin_function_or_method", 
-          ""
-        ], 
-        "93": [
-          "builtin_function_or_method", 
-          ""
-        ], 
-        "94": [
-          "builtin_function_or_method", 
-          ""
+          "module", 
+          ""
         ]
       }, 
       "line": 6, 
-      "event": "exception"
+      "event": "return"
     }
   ]
 }
diff --git a/PyTutorGAE/tests/backend-tests/john-import-test.txt b/PyTutorGAE/tests/backend-tests/john-import-test.txt
index 86746d336..68f54d63d 100644
--- a/PyTutorGAE/tests/backend-tests/john-import-test.txt
+++ b/PyTutorGAE/tests/backend-tests/john-import-test.txt
@@ -1,21 +1,11 @@
-from collections import OrderedDict
-from datetime import datetime
-from json import JSONDecoder
-from math import pi
-from math import sin, cos, atan2, radians, sqrt
-from random import randint
-import code
-import doctest
-import functools
-import inspect
-import io
 import math
-import operator as op
-import os
-import random
-import re
-import signal
+import operator
 import string
-import sys
-import unittest
+import collections
+import re
+import json
 
+# these don't seem allowed by bdb in Python 2.6, so punt for now
+#import random
+#import datetime
+#import functools

From c62f5cfc47d38ad690209e61e2e900276d2eef1c Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 22 Aug 2012 21:36:54 -0700
Subject: [PATCH 154/502] revert prev. change

---
 PyTutorGAE/pg_logger.py | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index ee915007a..8556c32f6 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -553,26 +553,28 @@ def _runscript(self, script_str):
         self._wait_for_mainpyfile = 1
 
 
+        # I think Google App Engine takes care of sandboxing, but maybe
+        # we should do some extra sandboxing ourselves ...
+        '''
         # ok, let's try to sorta 'sandbox' the user script by not
-        # allowing certain potentially dangerous operations.
-        #
-        # (Note that we still allow imports and let App Engine take care
-        # of sandboxing those appropriately.)
+        # allowing certain potentially dangerous operations:
         user_builtins = {}
         for (k,v) in __builtins__.iteritems():
           if k in ('reload', 'input', 'apply', 'open', 'compile',
-                   'file', 'eval', 'execfile',
+                   '__import__', 'file', 'eval', 'execfile',
                    'exit', 'quit', 'raw_input',
-                   'dir', 'globals', 'locals', 'vars'):
+                   'dir', 'globals', 'locals', 'vars',
+                   'compile'):
             continue
           user_builtins[k] = v
+        '''
 
 
         user_stdout = cStringIO.StringIO()
 
         sys.stdout = user_stdout
         user_globals = {"__name__"    : "__main__",
-                        "__builtins__" : user_builtins,
+                        "__builtins__" : __builtins__,
                         "__user_stdout__" : user_stdout}
 
         try:

From be1b9a6100d334453e8979f7f386641ffdd578f5 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 22 Aug 2012 21:51:03 -0700
Subject: [PATCH 155/502] prettier-printing of modules and restrict floats to
 be 4 digits

---
 PyTutorGAE/pg_encoder.py        |  16 ++-
 example-code/py_tutorial.golden | 116 ++++++++---------
 example-code/sqrt.golden        | 214 ++++++++++++++++----------------
 3 files changed, 180 insertions(+), 166 deletions(-)

diff --git a/PyTutorGAE/pg_encoder.py b/PyTutorGAE/pg_encoder.py
index cc86a87d6..d1a33a8d1 100644
--- a/PyTutorGAE/pg_encoder.py
+++ b/PyTutorGAE/pg_encoder.py
@@ -45,12 +45,17 @@
 #   * instance - ['INSTANCE', class name, [attr1, value1], [attr2, value2], ..., [attrN, valueN]]
 #   * class    - ['CLASS', class name, [list of superclass names], [attr1, value1], [attr2, value2], ..., [attrN, valueN]]
 #   * function - ['FUNCTION', function name, parent frame ID (for nested functions)]
+#   * module   - ['module', module name]
 #   * other    - [, string representation of object]
 #   * compound object reference - ['REF', target object's unique_id]
 #
 # the unique_id is derived from id(), which allows us to capture aliasing
 
 
+# number of significant digits for floats
+FLOAT_PRECISION = 4
+
+
 import re, types
 import sys
 typeRE = re.compile("")
@@ -103,7 +108,10 @@ def set_function_parent_frame_ID(self, ref_obj, enclosing_frame_id):
   def encode(self, dat):
     # primitive type
     if type(dat) in (int, long, float, str, bool, type(None)):
-      return dat
+      if type(dat) is float:
+        return round(dat, FLOAT_PRECISION)
+      else:
+        return dat
 
     # compound type - return an object reference and update encoded_heap_objects
     else:
@@ -166,9 +174,15 @@ def encode(self, dat):
         new_obj.extend(['FUNCTION', pretty_name, None]) # the final element will be filled in later
       elif self.is_class(dat) or self.is_instance(dat):
         self.encode_class_or_instance(dat, new_obj)
+      elif typ is types.ModuleType:
+        new_obj.extend(['module', dat.__name__])
       else:
         typeStr = str(typ)
         m = typeRE.match(typeStr)
+
+        if not m:
+          m = classRE.match(typeStr)
+
         assert m, typ
         new_obj.extend([m.group(1), str(dat)])
 
diff --git a/example-code/py_tutorial.golden b/example-code/py_tutorial.golden
index c46ed318f..408ae9b30 100644
--- a/example-code/py_tutorial.golden
+++ b/example-code/py_tutorial.golden
@@ -35,7 +35,7 @@
       "stack_to_render": [], 
       "globals": {
         "age": 26, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {}, 
       "line": 8, 
@@ -52,7 +52,7 @@
       "stack_to_render": [], 
       "globals": {
         "age": 26, 
-        "pi": 3.1415899999999999, 
+        "pi": 3.1416, 
         "s": "Rutherford Birchard Hayes"
       }, 
       "heap": {}, 
@@ -75,7 +75,7 @@
           1
         ], 
         "age": 26, 
-        "pi": 3.1415899999999999, 
+        "pi": 3.1416, 
         "s": "Rutherford Birchard Hayes"
       }, 
       "heap": {
@@ -106,7 +106,7 @@
           1
         ], 
         "age": 26, 
-        "pi": 3.1415899999999999, 
+        "pi": 3.1416, 
         "s": "Rutherford Birchard Hayes", 
         "firstName": "Rutherford"
       }, 
@@ -142,7 +142,7 @@
           1
         ], 
         "s": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -178,7 +178,7 @@
           1
         ], 
         "s": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -216,7 +216,7 @@
         ], 
         "s": "Rutherford Birchard Hayes", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -254,7 +254,7 @@
         ], 
         "s": "Rutherford Birchard Hayes", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -292,7 +292,7 @@
         ], 
         "s": "Rutherford Birchard Hayes", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -335,7 +335,7 @@
         ], 
         "s": "Rutherford Birchard Hayes", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -384,7 +384,7 @@
         ], 
         "s": "Rutherford Birchard Hayes", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -436,7 +436,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "John", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -488,7 +488,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "John", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -540,7 +540,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "Paul", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -592,7 +592,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "Paul", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -644,7 +644,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "George", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -696,7 +696,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "George", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -748,7 +748,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -800,7 +800,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -852,7 +852,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -909,7 +909,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -983,7 +983,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -1067,7 +1067,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -1151,7 +1151,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -1236,7 +1236,7 @@
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
         "thisAge": 34, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -1321,7 +1321,7 @@
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
         "thisAge": 34, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -1406,7 +1406,7 @@
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
         "thisAge": 9, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -1491,7 +1491,7 @@
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
         "thisAge": 9, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -1576,7 +1576,7 @@
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
         "thisAge": 18, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -1661,7 +1661,7 @@
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
         "thisAge": 18, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -1746,7 +1746,7 @@
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
         "thisAge": 19, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -1831,7 +1831,7 @@
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
         "thisAge": 19, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -1916,7 +1916,7 @@
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
         "thisAge": 22, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -2001,7 +2001,7 @@
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
         "thisAge": 22, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -2086,7 +2086,7 @@
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -2171,7 +2171,7 @@
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -2256,7 +2256,7 @@
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -2341,7 +2341,7 @@
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -2426,7 +2426,7 @@
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -2511,7 +2511,7 @@
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -2601,7 +2601,7 @@
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -2705,7 +2705,7 @@
         "b": "Ringo", 
         "lastName": "Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -2812,7 +2812,7 @@
         "b": "Ringo", 
         "lastName": "Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -2923,7 +2923,7 @@
         "b": "Ringo", 
         "lastName": "Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -3038,7 +3038,7 @@
         "b": "Ringo", 
         "lastName": "Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -3157,7 +3157,7 @@
         "b": "Ringo", 
         "lastName": "Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999
+        "pi": 3.1416
       }, 
       "heap": {
         "1": [
@@ -3283,7 +3283,7 @@
         "b": "Ringo", 
         "lastName": "Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999, 
+        "pi": 3.1416, 
         "worth": 3000000000
       }, 
       "heap": {
@@ -3410,7 +3410,7 @@
         "b": "Ringo", 
         "lastName": "Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999, 
+        "pi": 3.1416, 
         "worth": 3000000000
       }, 
       "heap": {
@@ -3537,7 +3537,7 @@
         "b": "Ringo", 
         "lastName": "Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999, 
+        "pi": 3.1416, 
         "worth": 58000000000
       }, 
       "heap": {
@@ -3664,7 +3664,7 @@
         "b": "Ringo", 
         "lastName": "Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999, 
+        "pi": 3.1416, 
         "worth": 58000000000
       }, 
       "heap": {
@@ -3791,7 +3791,7 @@
         "b": "Ringo", 
         "lastName": "Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999, 
+        "pi": 3.1416, 
         "worth": 20000
       }, 
       "heap": {
@@ -3918,7 +3918,7 @@
         "b": "Ringo", 
         "lastName": "Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999, 
+        "pi": 3.1416, 
         "worth": 20000
       }, 
       "heap": {
@@ -4045,7 +4045,7 @@
         "b": "Ringo", 
         "lastName": "Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999, 
+        "pi": 3.1416, 
         "worth": 20000
       }, 
       "heap": {
@@ -4172,7 +4172,7 @@
         "b": "Ringo", 
         "lastName": "Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999, 
+        "pi": 3.1416, 
         "worth": 40000000
       }, 
       "heap": {
@@ -4299,7 +4299,7 @@
         "b": "Ringo", 
         "lastName": "Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999, 
+        "pi": 3.1416, 
         "worth": 40000000
       }, 
       "heap": {
@@ -4426,7 +4426,7 @@
         "b": "Ringo", 
         "lastName": "Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999, 
+        "pi": 3.1416, 
         "worth": 40000000
       }, 
       "heap": {
@@ -4553,7 +4553,7 @@
         "b": "Ringo", 
         "lastName": "Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999, 
+        "pi": 3.1416, 
         "worth": 40000000
       }, 
       "heap": {
@@ -4680,7 +4680,7 @@
         "b": "Ringo", 
         "lastName": "Hayes", 
         "thisAge": 28, 
-        "pi": 3.1415899999999999, 
+        "pi": 3.1416, 
         "worth": 40000000
       }, 
       "heap": {
diff --git a/example-code/sqrt.golden b/example-code/sqrt.golden
index 5d8be8e5d..f091f44c5 100644
--- a/example-code/sqrt.golden
+++ b/example-code/sqrt.golden
@@ -3122,7 +3122,7 @@
           "frame_id": 9, 
           "encoded_locals": {
             "a": 5.0, 
-            "__return__": 3.3999999999999999, 
+            "__return__": 3.4, 
             "b": 1.8
           }, 
           "is_highlighted": true, 
@@ -3255,7 +3255,7 @@
         {
           "frame_id": 8, 
           "encoded_locals": {
-            "__return__": 3.3999999999999999, 
+            "__return__": 3.4, 
             "guess": 5.0
           }, 
           "is_highlighted": true, 
@@ -3387,7 +3387,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -3517,7 +3517,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -3647,7 +3647,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -3664,7 +3664,7 @@
         {
           "frame_id": 11, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -3794,7 +3794,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -3811,7 +3811,7 @@
         {
           "frame_id": 11, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -3941,7 +3941,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -3959,7 +3959,7 @@
           "frame_id": 11, 
           "encoded_locals": {
             "__return__": false, 
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -4090,7 +4090,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -4220,7 +4220,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -4237,7 +4237,7 @@
         {
           "frame_id": 12, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -4367,7 +4367,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -4384,7 +4384,7 @@
         {
           "frame_id": 12, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -4514,7 +4514,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -4531,7 +4531,7 @@
         {
           "frame_id": 12, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -4548,8 +4548,8 @@
         {
           "frame_id": 13, 
           "encoded_locals": {
-            "a": 3.3999999999999999, 
-            "b": 2.6470588235294117
+            "a": 3.4, 
+            "b": 2.6471
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -4680,7 +4680,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -4697,7 +4697,7 @@
         {
           "frame_id": 12, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -4714,8 +4714,8 @@
         {
           "frame_id": 13, 
           "encoded_locals": {
-            "a": 3.3999999999999999, 
-            "b": 2.6470588235294117
+            "a": 3.4, 
+            "b": 2.6471
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -4846,7 +4846,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -4863,7 +4863,7 @@
         {
           "frame_id": 12, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -4880,9 +4880,9 @@
         {
           "frame_id": 13, 
           "encoded_locals": {
-            "a": 3.3999999999999999, 
-            "__return__": 3.0235294117647058, 
-            "b": 2.6470588235294117
+            "a": 3.4, 
+            "__return__": 3.0235, 
+            "b": 2.6471
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -5014,7 +5014,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -5031,8 +5031,8 @@
         {
           "frame_id": 12, 
           "encoded_locals": {
-            "__return__": 3.0235294117647058, 
-            "guess": 3.3999999999999999
+            "__return__": 3.0235, 
+            "guess": 3.4
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -5163,7 +5163,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -5180,7 +5180,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -5310,7 +5310,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -5327,7 +5327,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -5457,7 +5457,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -5474,7 +5474,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -5491,7 +5491,7 @@
         {
           "frame_id": 15, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -5621,7 +5621,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -5638,7 +5638,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -5655,7 +5655,7 @@
         {
           "frame_id": 15, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -5785,7 +5785,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -5802,7 +5802,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -5820,7 +5820,7 @@
           "frame_id": 15, 
           "encoded_locals": {
             "__return__": false, 
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -5951,7 +5951,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -5968,7 +5968,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -6098,7 +6098,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6115,7 +6115,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6132,7 +6132,7 @@
         {
           "frame_id": 16, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -6262,7 +6262,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6279,7 +6279,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6296,7 +6296,7 @@
         {
           "frame_id": 16, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -6426,7 +6426,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6443,7 +6443,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6460,7 +6460,7 @@
         {
           "frame_id": 16, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6477,8 +6477,8 @@
         {
           "frame_id": 17, 
           "encoded_locals": {
-            "a": 3.0235294117647058, 
-            "b": 2.9766536964980546
+            "a": 3.0235, 
+            "b": 2.9767
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -6609,7 +6609,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6626,7 +6626,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6643,7 +6643,7 @@
         {
           "frame_id": 16, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6660,8 +6660,8 @@
         {
           "frame_id": 17, 
           "encoded_locals": {
-            "a": 3.0235294117647058, 
-            "b": 2.9766536964980546
+            "a": 3.0235, 
+            "b": 2.9767
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -6792,7 +6792,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6809,7 +6809,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6826,7 +6826,7 @@
         {
           "frame_id": 16, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6843,9 +6843,9 @@
         {
           "frame_id": 17, 
           "encoded_locals": {
-            "a": 3.0235294117647058, 
-            "__return__": 3.0000915541313802, 
-            "b": 2.9766536964980546
+            "a": 3.0235, 
+            "__return__": 3.0001, 
+            "b": 2.9767
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -6977,7 +6977,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6994,7 +6994,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7011,8 +7011,8 @@
         {
           "frame_id": 16, 
           "encoded_locals": {
-            "__return__": 3.0000915541313802, 
-            "guess": 3.0235294117647058
+            "__return__": 3.0001, 
+            "guess": 3.0235
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -7143,7 +7143,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7160,7 +7160,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7177,7 +7177,7 @@
         {
           "frame_id": 18, 
           "encoded_locals": {
-            "guess": 3.0000915541313802
+            "guess": 3.0001
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -7307,7 +7307,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7324,7 +7324,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7341,7 +7341,7 @@
         {
           "frame_id": 18, 
           "encoded_locals": {
-            "guess": 3.0000915541313802
+            "guess": 3.0001
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -7471,7 +7471,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7488,7 +7488,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7505,7 +7505,7 @@
         {
           "frame_id": 18, 
           "encoded_locals": {
-            "guess": 3.0000915541313802
+            "guess": 3.0001
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7522,7 +7522,7 @@
         {
           "frame_id": 19, 
           "encoded_locals": {
-            "guess": 3.0000915541313802
+            "guess": 3.0001
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -7652,7 +7652,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7669,7 +7669,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7686,7 +7686,7 @@
         {
           "frame_id": 18, 
           "encoded_locals": {
-            "guess": 3.0000915541313802
+            "guess": 3.0001
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7703,7 +7703,7 @@
         {
           "frame_id": 19, 
           "encoded_locals": {
-            "guess": 3.0000915541313802
+            "guess": 3.0001
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -7833,7 +7833,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7850,7 +7850,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7867,7 +7867,7 @@
         {
           "frame_id": 18, 
           "encoded_locals": {
-            "guess": 3.0000915541313802
+            "guess": 3.0001
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7885,7 +7885,7 @@
           "frame_id": 19, 
           "encoded_locals": {
             "__return__": true, 
-            "guess": 3.0000915541313802
+            "guess": 3.0001
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -8016,7 +8016,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8033,7 +8033,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8050,7 +8050,7 @@
         {
           "frame_id": 18, 
           "encoded_locals": {
-            "guess": 3.0000915541313802
+            "guess": 3.0001
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -8180,7 +8180,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8197,7 +8197,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235294117647058
+            "guess": 3.0235
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8214,8 +8214,8 @@
         {
           "frame_id": 18, 
           "encoded_locals": {
-            "__return__": 3.0000915541313802, 
-            "guess": 3.0000915541313802
+            "__return__": 3.0001, 
+            "guess": 3.0001
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -8346,7 +8346,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.3999999999999999
+            "guess": 3.4
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8363,8 +8363,8 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "__return__": 3.0000915541313802, 
-            "guess": 3.0235294117647058
+            "__return__": 3.0001, 
+            "guess": 3.0235
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -8495,8 +8495,8 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "__return__": 3.0000915541313802, 
-            "guess": 3.3999999999999999
+            "__return__": 3.0001, 
+            "guess": 3.4
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -8610,7 +8610,7 @@
         {
           "frame_id": 6, 
           "encoded_locals": {
-            "__return__": 3.0000915541313802, 
+            "__return__": 3.0001, 
             "guess": 5.0
           }, 
           "is_highlighted": true, 
@@ -8708,7 +8708,7 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": 3.0000915541313802, 
+            "__return__": 3.0001, 
             "guess": 1.0
           }, 
           "is_highlighted": true, 
@@ -8779,7 +8779,7 @@
               "REF", 
               3
             ], 
-            "__return__": 3.0000915541313802, 
+            "__return__": 3.0001, 
             "x": 9, 
             "average": [
               "REF", 
@@ -8861,7 +8861,7 @@
               "REF", 
               3
             ], 
-            "__return__": 3.0000915541313802, 
+            "__return__": 3.0001, 
             "x": 9, 
             "average": [
               "REF", 
@@ -8893,7 +8893,7 @@
           "REF", 
           1
         ], 
-        "ans": 3.0000915541313802
+        "ans": 3.0001
       }, 
       "heap": {
         "1": [

From d830d12be76fa97382e391d27498a07d720fbbde Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 22 Aug 2012 22:24:44 -0700
Subject: [PATCH 156/502] added some rudimentary python sandboxing

---
 PyTutorGAE/pg_logger.py | 50 +++++++++++++++++++++++++++++------------
 1 file changed, 36 insertions(+), 14 deletions(-)

diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index 8556c32f6..121ecbe9f 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -54,8 +54,31 @@
 #DEBUG = False
 DEBUG = True
 
+BUILTIN_IMPORT = __builtins__['__import__']
 
-IGNORE_VARS = set(('__user_stdout__', '__builtins__', '__name__', '__exception__', '__doc__'))
+# simple sandboxing scheme:
+
+# whitelist of module imports
+ALLOWED_MODULE_IMPORTS = ('math', 'random', 'datetime',
+                          'functools', 'operator', 'string',
+                          'collections', 're', 'json')
+
+# Restrict imports to a whitelist
+def __restricted_import__(*args):
+  if args[0] in ALLOWED_MODULE_IMPORTS:
+    return BUILTIN_IMPORT(*args)
+  else:
+    raise ImportError('{0} not supported'.format(args[0]))
+
+
+# blacklist of builtins
+BANNED_BUILTINS = ('reload', 'input', 'apply', 'open', 'compile',
+                   'file', 'eval', 'exec', 'execfile',
+                   'exit', 'quit', 'raw_input', 'help',
+                   'dir', 'globals', 'locals', 'vars')
+
+
+IGNORE_VARS = set(('__user_stdout__', '__builtins__', '__name__', '__exception__', '__doc__', '__package__'))
 
 def get_user_stdout(frame):
   return frame.f_globals['__user_stdout__'].getvalue()
@@ -241,6 +264,10 @@ def interaction(self, frame, traceback, event_type):
         top_frame = tos[0]
         lineno = tos[1]
 
+        # don't trace inside of our __restricted_import__ helper function
+        if top_frame.f_code.co_name == '__restricted_import__':
+          return
+
         self.encoder.reset_heap() # VERY VERY VERY IMPORTANT,
                                   # or else we won't properly capture heap object mutations in the trace!
 
@@ -553,28 +580,23 @@ def _runscript(self, script_str):
         self._wait_for_mainpyfile = 1
 
 
-        # I think Google App Engine takes care of sandboxing, but maybe
-        # we should do some extra sandboxing ourselves ...
-        '''
         # ok, let's try to sorta 'sandbox' the user script by not
-        # allowing certain potentially dangerous operations:
+        # allowing certain potentially dangerous operations.
         user_builtins = {}
-        for (k,v) in __builtins__.iteritems():
-          if k in ('reload', 'input', 'apply', 'open', 'compile',
-                   '__import__', 'file', 'eval', 'execfile',
-                   'exit', 'quit', 'raw_input',
-                   'dir', 'globals', 'locals', 'vars',
-                   'compile'):
+        for (k, v) in __builtins__.iteritems():
+          if k in BANNED_BUILTINS:
             continue
-          user_builtins[k] = v
-        '''
+          elif k == '__import__':
+            user_builtins[k] = __restricted_import__
+          else:
+            user_builtins[k] = v
 
 
         user_stdout = cStringIO.StringIO()
 
         sys.stdout = user_stdout
         user_globals = {"__name__"    : "__main__",
-                        "__builtins__" : __builtins__,
+                        "__builtins__" : user_builtins,
                         "__user_stdout__" : user_stdout}
 
         try:

From cf51044414c42cbd9d635f48e755fbdac55bc1fb Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 22 Aug 2012 22:24:55 -0700
Subject: [PATCH 157/502] sync'ed tests

---
 .../tests/backend-tests/exec_test.golden      |   48 +-
 .../tests/backend-tests/import_error.golden   |   50 +-
 .../infinite_loop_one_liner.golden            |   20 +-
 .../backend-tests/john-import-test.golden     |   74 +-
 .../tests/backend-tests/john-import-test.txt  |    2 +-
 .../tests/backend-tests/open_error.golden     | 1215 +----------------
 6 files changed, 57 insertions(+), 1352 deletions(-)

diff --git a/PyTutorGAE/tests/backend-tests/exec_test.golden b/PyTutorGAE/tests/backend-tests/exec_test.golden
index af1afcf98..aba0c1788 100644
--- a/PyTutorGAE/tests/backend-tests/exec_test.golden
+++ b/PyTutorGAE/tests/backend-tests/exec_test.golden
@@ -1,4 +1,3 @@
-security breach
 {
   "code": "exec \"import os; os.system('echo security breach')\"\n", 
   "trace": [
@@ -33,52 +32,15 @@ security breach
       "event": "step_line"
     }, 
     {
-      "ordered_globals": [
-        "os", 
-        "__package__"
-      ], 
-      "stdout": "", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {
-        "os": [
-          "REF", 
-          1
-        ], 
-        "__package__": null
-      }, 
-      "heap": {
-        "1": [
-          "module", 
-          ""
-        ]
-      }, 
-      "line": 1, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [
-        "os", 
-        "__package__"
-      ], 
+      "ordered_globals": [], 
       "stdout": "", 
+      "exception_msg": "ImportError: os not supported", 
       "func_name": "", 
       "stack_to_render": [], 
-      "globals": {
-        "os": [
-          "REF", 
-          1
-        ], 
-        "__package__": null
-      }, 
-      "heap": {
-        "1": [
-          "module", 
-          ""
-        ]
-      }, 
+      "globals": {}, 
+      "heap": {}, 
       "line": 1, 
-      "event": "return"
+      "event": "exception"
     }
   ]
 }
diff --git a/PyTutorGAE/tests/backend-tests/import_error.golden b/PyTutorGAE/tests/backend-tests/import_error.golden
index 495ab6d33..96e9fa679 100644
--- a/PyTutorGAE/tests/backend-tests/import_error.golden
+++ b/PyTutorGAE/tests/backend-tests/import_error.golden
@@ -1,4 +1,3 @@
-security breach
 {
   "code": "# should NOT allow for any imports\nimport os\n\nos.system(\"echo security breach\")\n", 
   "trace": [
@@ -13,52 +12,15 @@ security breach
       "event": "step_line"
     }, 
     {
-      "ordered_globals": [
-        "os", 
-        "__package__"
-      ], 
-      "stdout": "", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {
-        "os": [
-          "REF", 
-          1
-        ], 
-        "__package__": null
-      }, 
-      "heap": {
-        "1": [
-          "module", 
-          ""
-        ]
-      }, 
-      "line": 4, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [
-        "os", 
-        "__package__"
-      ], 
+      "ordered_globals": [], 
       "stdout": "", 
+      "exception_msg": "ImportError: os not supported", 
       "func_name": "", 
       "stack_to_render": [], 
-      "globals": {
-        "os": [
-          "REF", 
-          1
-        ], 
-        "__package__": null
-      }, 
-      "heap": {
-        "1": [
-          "module", 
-          ""
-        ]
-      }, 
-      "line": 4, 
-      "event": "return"
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "exception"
     }
   ]
 }
diff --git a/PyTutorGAE/tests/backend-tests/infinite_loop_one_liner.golden b/PyTutorGAE/tests/backend-tests/infinite_loop_one_liner.golden
index dec2f630d..93cda763e 100644
--- a/PyTutorGAE/tests/backend-tests/infinite_loop_one_liner.golden
+++ b/PyTutorGAE/tests/backend-tests/infinite_loop_one_liner.golden
@@ -11,16 +11,6 @@
       "line": 1, 
       "event": "step_line"
     }, 
-    {
-      "ordered_globals": [], 
-      "stdout": "", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {}, 
-      "heap": {}, 
-      "line": 1, 
-      "event": "step_line"
-    }, 
     {
       "ordered_globals": [], 
       "stdout": "hahahaha\n", 
@@ -3001,6 +2991,16 @@
       "line": 1, 
       "event": "step_line"
     }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
     {
       "exception_msg": "(stopped after 300 steps to prevent possible infinite loop)", 
       "event": "instruction_limit_reached"
diff --git a/PyTutorGAE/tests/backend-tests/john-import-test.golden b/PyTutorGAE/tests/backend-tests/john-import-test.golden
index 9483d42d3..add78fcb4 100644
--- a/PyTutorGAE/tests/backend-tests/john-import-test.golden
+++ b/PyTutorGAE/tests/backend-tests/john-import-test.golden
@@ -1,5 +1,5 @@
 {
-  "code": "import math\nimport operator\nimport string\nimport collections\nimport re\nimport json\n\n# these don't seem allowed by bdb in Python 2.6, so punt for now\n#import random\n#import datetime\n#import functools\n", 
+  "code": "import math\nimport operator\nimport string\nimport collections\nimport re\nimport json\n\n# causes some errors in regression tests, but fine in GAE ...\n#import random\n#import datetime\n#import functools\n", 
   "trace": [
     {
       "ordered_globals": [], 
@@ -13,8 +13,7 @@
     }, 
     {
       "ordered_globals": [
-        "math", 
-        "__package__"
+        "math"
       ], 
       "stdout": "", 
       "func_name": "", 
@@ -23,13 +22,12 @@
         "math": [
           "REF", 
           1
-        ], 
-        "__package__": null
+        ]
       }, 
       "heap": {
         "1": [
           "module", 
-          ""
+          "math"
         ]
       }, 
       "line": 2, 
@@ -38,7 +36,6 @@
     {
       "ordered_globals": [
         "math", 
-        "__package__", 
         "operator"
       ], 
       "stdout": "", 
@@ -52,17 +49,16 @@
         "math": [
           "REF", 
           1
-        ], 
-        "__package__": null
+        ]
       }, 
       "heap": {
         "1": [
           "module", 
-          ""
+          "math"
         ], 
         "2": [
           "module", 
-          ""
+          "operator"
         ]
       }, 
       "line": 3, 
@@ -71,7 +67,6 @@
     {
       "ordered_globals": [
         "math", 
-        "__package__", 
         "operator", 
         "string"
       ], 
@@ -90,21 +85,20 @@
         "math": [
           "REF", 
           1
-        ], 
-        "__package__": null
+        ]
       }, 
       "heap": {
         "1": [
           "module", 
-          ""
+          "math"
         ], 
         "2": [
           "module", 
-          ""
+          "operator"
         ], 
         "3": [
           "module", 
-          ""
+          "string"
         ]
       }, 
       "line": 4, 
@@ -113,7 +107,6 @@
     {
       "ordered_globals": [
         "math", 
-        "__package__", 
         "operator", 
         "string", 
         "collections"
@@ -137,25 +130,24 @@
         "math": [
           "REF", 
           1
-        ], 
-        "__package__": null
+        ]
       }, 
       "heap": {
         "1": [
           "module", 
-          ""
+          "math"
         ], 
         "2": [
           "module", 
-          ""
+          "operator"
         ], 
         "3": [
           "module", 
-          ""
+          "string"
         ], 
         "4": [
           "module", 
-          ""
+          "collections"
         ]
       }, 
       "line": 5, 
@@ -164,7 +156,6 @@
     {
       "ordered_globals": [
         "math", 
-        "__package__", 
         "operator", 
         "string", 
         "collections", 
@@ -174,11 +165,10 @@
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
-        "string": [
+        "operator": [
           "REF", 
-          3
+          2
         ], 
-        "__package__": null, 
         "re": [
           "REF", 
           5
@@ -187,9 +177,9 @@
           "REF", 
           4
         ], 
-        "operator": [
+        "string": [
           "REF", 
-          2
+          3
         ], 
         "math": [
           "REF", 
@@ -199,23 +189,23 @@
       "heap": {
         "1": [
           "module", 
-          ""
+          "math"
         ], 
         "2": [
           "module", 
-          ""
+          "operator"
         ], 
         "3": [
           "module", 
-          ""
+          "string"
         ], 
         "4": [
           "module", 
-          ""
+          "collections"
         ], 
         "5": [
           "module", 
-          ""
+          "re"
         ]
       }, 
       "line": 6, 
@@ -224,7 +214,6 @@
     {
       "ordered_globals": [
         "math", 
-        "__package__", 
         "operator", 
         "string", 
         "collections", 
@@ -239,7 +228,6 @@
           "REF", 
           3
         ], 
-        "__package__": null, 
         "re": [
           "REF", 
           5
@@ -264,27 +252,27 @@
       "heap": {
         "1": [
           "module", 
-          ""
+          "math"
         ], 
         "2": [
           "module", 
-          ""
+          "operator"
         ], 
         "3": [
           "module", 
-          ""
+          "string"
         ], 
         "4": [
           "module", 
-          ""
+          "collections"
         ], 
         "5": [
           "module", 
-          ""
+          "re"
         ], 
         "6": [
           "module", 
-          ""
+          "json"
         ]
       }, 
       "line": 6, 
diff --git a/PyTutorGAE/tests/backend-tests/john-import-test.txt b/PyTutorGAE/tests/backend-tests/john-import-test.txt
index 68f54d63d..fcb15f43f 100644
--- a/PyTutorGAE/tests/backend-tests/john-import-test.txt
+++ b/PyTutorGAE/tests/backend-tests/john-import-test.txt
@@ -5,7 +5,7 @@ import collections
 import re
 import json
 
-# these don't seem allowed by bdb in Python 2.6, so punt for now
+# causes some errors in regression tests, but fine in GAE ...
 #import random
 #import datetime
 #import functools
diff --git a/PyTutorGAE/tests/backend-tests/open_error.golden b/PyTutorGAE/tests/backend-tests/open_error.golden
index 768b56878..c9df6d16a 100644
--- a/PyTutorGAE/tests/backend-tests/open_error.golden
+++ b/PyTutorGAE/tests/backend-tests/open_error.golden
@@ -12,1222 +12,15 @@
       "event": "step_line"
     }, 
     {
-      "ordered_globals": [
-        "line"
-      ], 
+      "ordered_globals": [], 
       "stdout": "", 
+      "exception_msg": "NameError: name 'open' is not defined", 
       "func_name": "", 
       "stack_to_render": [], 
-      "globals": {
-        "line": "root:x:0:0:root:/root:/bin/bash\n"
-      }, 
-      "heap": {}, 
-      "line": 2, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [
-        "line"
-      ], 
-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\n", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {
-        "line": "root:x:0:0:root:/root:/bin/bash\n"
-      }, 
-      "heap": {}, 
-      "line": 1, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [
-        "line"
-      ], 
-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\n", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {
-        "line": "daemon:x:1:1:daemon:/usr/sbin:/bin/sh\n"
-      }, 
-      "heap": {}, 
-      "line": 2, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [
-        "line"
-      ], 
-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\n", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {
-        "line": "daemon:x:1:1:daemon:/usr/sbin:/bin/sh\n"
-      }, 
-      "heap": {}, 
-      "line": 1, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [
-        "line"
-      ], 
-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\n", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {
-        "line": "bin:x:2:2:bin:/bin:/bin/sh\n"
-      }, 
-      "heap": {}, 
-      "line": 2, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [
-        "line"
-      ], 
-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\n", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {
-        "line": "bin:x:2:2:bin:/bin:/bin/sh\n"
-      }, 
-      "heap": {}, 
-      "line": 1, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [
-        "line"
-      ], 
-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\n", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {
-        "line": "sys:x:3:3:sys:/dev:/bin/sh\n"
-      }, 
-      "heap": {}, 
-      "line": 2, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [
-        "line"
-      ], 
-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\n", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {
-        "line": "sys:x:3:3:sys:/dev:/bin/sh\n"
-      }, 
-      "heap": {}, 
-      "line": 1, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [
-        "line"
-      ], 
-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\n", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {
-        "line": "sync:x:4:65534:sync:/bin:/bin/sync\n"
-      }, 
-      "heap": {}, 
-      "line": 2, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [
-        "line"
-      ], 
-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\n", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {
-        "line": "sync:x:4:65534:sync:/bin:/bin/sync\n"
-      }, 
-      "heap": {}, 
-      "line": 1, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [
-        "line"
-      ], 
-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\n", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {
-        "line": "games:x:5:60:games:/usr/games:/bin/sh\n"
-      }, 
-      "heap": {}, 
-      "line": 2, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [
-        "line"
-      ], 
-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\n", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {
-        "line": "games:x:5:60:games:/usr/games:/bin/sh\n"
-      }, 
-      "heap": {}, 
-      "line": 1, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [
-        "line"
-      ], 
-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\n", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {
-        "line": "man:x:6:12:man:/var/cache/man:/bin/sh\n"
-      }, 
-      "heap": {}, 
-      "line": 2, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [
-        "line"
-      ], 
-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\n", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {
-        "line": "man:x:6:12:man:/var/cache/man:/bin/sh\n"
-      }, 
-      "heap": {}, 
-      "line": 1, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [
-        "line"
-      ], 
-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\n", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {
-        "line": "lp:x:7:7:lp:/var/spool/lpd:/bin/sh\n"
-      }, 
-      "heap": {}, 
-      "line": 2, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [
-        "line"
-      ], 
-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\n", 
-      "func_name": "", 
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-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\n", 
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-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\n", 
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-      "ordered_globals": [
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-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\n", 
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-        "line": "statd:x:118:65534::/var/lib/nfs:/bin/false\n"
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-      "line": 2, 
-      "event": "step_line"
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-      "ordered_globals": [
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-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\n", 
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-      "line": 1, 
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-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\n", 
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-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\n", 
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-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\n", 
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-      "line": 2, 
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-      "ordered_globals": [
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-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\n", 
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-      "stack_to_render": [], 
-      "globals": {
-        "line": "tss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n"
-      }, 
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-      "line": 1, 
-      "event": "step_line"
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-    {
-      "ordered_globals": [
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-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\n", 
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-      "stack_to_render": [], 
-      "globals": {
-        "line": "distccd:x:120:65534::/:/bin/false\n"
-      }, 
-      "heap": {}, 
-      "line": 2, 
-      "event": "step_line"
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-    {
-      "ordered_globals": [
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-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\ndistccd:x:120:65534::/:/bin/false\n\n", 
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-      "stack_to_render": [], 
-      "globals": {
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-      "line": 1, 
-      "event": "step_line"
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-      "ordered_globals": [
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-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\ndistccd:x:120:65534::/:/bin/false\n\n", 
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-      "line": 2, 
-      "event": "step_line"
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-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\ndistccd:x:120:65534::/:/bin/false\n\nx20:x:903:65534::/nonexistent:/bin/false\n\n", 
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-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\ndistccd:x:120:65534::/:/bin/false\n\nx20:x:903:65534::/nonexistent:/bin/false\n\nobjfs:x:904:65534::/usr/local/google/objfs:/bin/sh\n\n", 
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-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\ndistccd:x:120:65534::/:/bin/false\n\nx20:x:903:65534::/nonexistent:/bin/false\n\nobjfs:x:904:65534::/usr/local/google/objfs:/bin/sh\n\nsrcfs:x:905:65534::/nonexistent:/bin/false\n\n", 
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-        "line"
-      ], 
-      "stdout": "root:x:0:0:root:/root:/bin/bash\n\ndaemon:x:1:1:daemon:/usr/sbin:/bin/sh\n\nbin:x:2:2:bin:/bin:/bin/sh\n\nsys:x:3:3:sys:/dev:/bin/sh\n\nsync:x:4:65534:sync:/bin:/bin/sync\n\ngames:x:5:60:games:/usr/games:/bin/sh\n\nman:x:6:12:man:/var/cache/man:/bin/sh\n\nlp:x:7:7:lp:/var/spool/lpd:/bin/sh\n\nmail:x:8:8:mail:/var/mail:/bin/sh\n\nnews:x:9:9:news:/var/spool/news:/bin/sh\n\nuucp:x:10:10:uucp:/var/spool/uucp:/bin/sh\n\nproxy:x:13:13:proxy:/bin:/bin/sh\n\nwww-data:x:33:33:www-data:/var/www:/bin/sh\n\nbackup:x:34:34:backup:/var/backups:/bin/sh\n\nlist:x:38:38:Mailing List Manager:/var/list:/bin/sh\n\nirc:x:39:39:ircd:/var/run/ircd:/bin/sh\n\ngnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh\n\nnobody:x:65534:65534:nobody:/nonexistent:/bin/sh\n\nlibuuid:x:100:101::/var/lib/libuuid:/bin/sh\n\nsyslog:x:101:103::/home/syslog:/bin/false\n\nmessagebus:x:102:107::/var/run/dbus:/bin/false\n\navahi-autoipd:x:103:110:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false\n\navahi:x:104:111:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false\n\ncouchdb:x:105:113:CouchDB Administrator,,,:/var/lib/couchdb:/bin/bash\n\nspeech-dispatcher:x:106:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/sh\n\nusbmux:x:107:46:usbmux daemon,,,:/home/usbmux:/bin/false\n\nhaldaemon:x:108:114:Hardware abstraction layer,,,:/var/run/hald:/bin/false\n\npulse:x:110:115:PulseAudio daemon,,,:/var/run/pulse:/bin/false\n\nrtkit:x:111:117:RealtimeKit,,,:/proc:/bin/false\n\nsaned:x:112:118::/home/saned:/bin/false\n\nhplip:x:113:7:HPLIP system user,,,:/var/run/hplip:/bin/false\n\ngdm:x:114:120:Gnome Display Manager:/var/lib/gdm:/bin/false\n\npuppet:x:115:122:Puppet configuration management daemon,,,:/var/lib/puppet:/bin/false\n\nntp:x:116:123::/home/ntp:/bin/false\n\npostfix:x:117:124::/var/spool/postfix:/bin/false\n\nstatd:x:118:65534::/var/lib/nfs:/bin/false\n\nsshd:x:119:65534::/var/run/sshd:/bin/false\n\ntss:x:109:127::/var/lib/tpm:/usr/sbin/nologin\n\ndistccd:x:120:65534::/:/bin/false\n\nx20:x:903:65534::/nonexistent:/bin/false\n\nobjfs:x:904:65534::/usr/local/google/objfs:/bin/sh\n\nsrcfs:x:905:65534::/nonexistent:/bin/false\n\ncrudd:x:906:65534::/nonexistent:/bin/false\n\n", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {
-        "line": "crudd:x:906:65534::/nonexistent:/bin/false\n"
-      }, 
+      "globals": {}, 
       "heap": {}, 
       "line": 1, 
-      "event": "return"
+      "event": "exception"
     }
   ]
 }

From 9eae95aef3cc134e2f931d90e8c81ee274bfa915 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 22 Aug 2012 22:57:45 -0700
Subject: [PATCH 158/502] wow what a gross-ass hack, wtf

---
 PyTutorGAE/pg_logger.py | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index 121ecbe9f..0b98dc3a7 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -54,10 +54,20 @@
 #DEBUG = False
 DEBUG = True
 
-BUILTIN_IMPORT = __builtins__['__import__']
 
 # simple sandboxing scheme:
 
+
+# ugh, I can't figure out why in Python 2, __builtins__ seems to
+# be a dict, but in Python 3, __builtins__ seems to be a module,
+# so just handle both cases ... UGLY!
+if type(__builtins__) is dict:
+  BUILTIN_IMPORT = __builtins__['__import__']
+else:
+  assert type(__builtins__) is types.ModuleType
+  BUILTIN_IMPORT = __builtins__.__import__
+
+
 # whitelist of module imports
 ALLOWED_MODULE_IMPORTS = ('math', 'random', 'datetime',
                           'functools', 'operator', 'string',
@@ -583,7 +593,19 @@ def _runscript(self, script_str):
         # ok, let's try to sorta 'sandbox' the user script by not
         # allowing certain potentially dangerous operations.
         user_builtins = {}
-        for (k, v) in __builtins__.iteritems():
+
+        # ugh, I can't figure out why in Python 2, __builtins__ seems to
+        # be a dict, but in Python 3, __builtins__ seems to be a module,
+        # so just handle both cases ... UGLY!
+        if type(__builtins__) is dict:
+          builtin_items = __builtins__.items()
+        else:
+          assert type(__builtins__) is types.ModuleType
+          builtin_items = []
+          for k in dir(__builtins__):
+            builtin_items.append((k, getattr(__builtins__, k)))
+
+        for (k, v) in builtin_items:
           if k in BANNED_BUILTINS:
             continue
           elif k == '__import__':

From bc21615cffdd3c97fcc1be6c47cbad19e96bdf28 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 22 Aug 2012 23:03:01 -0700
Subject: [PATCH 159/502] try to get lambdas working in python 2 and 3

---
 PyTutorGAE/pg_encoder.py | 2 +-
 PyTutorGAE/pg_logger.py  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/PyTutorGAE/pg_encoder.py b/PyTutorGAE/pg_encoder.py
index d1a33a8d1..88e1a3867 100644
--- a/PyTutorGAE/pg_encoder.py
+++ b/PyTutorGAE/pg_encoder.py
@@ -169,7 +169,7 @@ def encode(self, dat):
 
         func_name = get_name(dat)
         if func_name == '':
-          func_name = u"\u03BB" # Unicode lambda :)
+          func_name = "\u03BB" if is_python3 else u"\u03BB"
         pretty_name = func_name + '(' + ', '.join(printed_args) + ')'
         new_obj.extend(['FUNCTION', pretty_name, None]) # the final element will be filled in later
       elif self.is_class(dat) or self.is_instance(dat):
diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index 0b98dc3a7..a1d611fed 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -323,7 +323,7 @@ def create_encoded_stack_entry(cur_frame):
           # special case for lambdas - grab their line numbers too (or not)
           if cur_name == '':
             # Unicode lambda :)
-            cur_name = u"\u03BB" # + ':line' + str(cur_frame.f_code.co_firstlineno)
+            cur_name = "\u03BB" if is_python3 else u"\u03BB"
           elif cur_name == '':
             cur_name = 'unnamed function'
 

From 9cbdcc313113f36fed57779dcd4fa4093c3df5a6 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 22 Aug 2012 23:22:04 -0700
Subject: [PATCH 160/502] argh python 3333333

---
 PyTutorGAE/pg_encoder.py | 2 +-
 PyTutorGAE/pg_logger.py  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/PyTutorGAE/pg_encoder.py b/PyTutorGAE/pg_encoder.py
index 88e1a3867..3350fb3e1 100644
--- a/PyTutorGAE/pg_encoder.py
+++ b/PyTutorGAE/pg_encoder.py
@@ -169,7 +169,7 @@ def encode(self, dat):
 
         func_name = get_name(dat)
         if func_name == '':
-          func_name = "\u03BB" if is_python3 else u"\u03BB"
+          func_name = u"\u03BB" # for Python 3, eliminate the u prefix from the Unicode string
         pretty_name = func_name + '(' + ', '.join(printed_args) + ')'
         new_obj.extend(['FUNCTION', pretty_name, None]) # the final element will be filled in later
       elif self.is_class(dat) or self.is_instance(dat):
diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index a1d611fed..e8cb80f99 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -323,7 +323,7 @@ def create_encoded_stack_entry(cur_frame):
           # special case for lambdas - grab their line numbers too (or not)
           if cur_name == '':
             # Unicode lambda :)
-            cur_name = "\u03BB" if is_python3 else u"\u03BB"
+            cur_name = u"\u03BB" # for Python 3, eliminate the u prefix from the Unicode string
           elif cur_name == '':
             cur_name = 'unnamed function'
 

From 68c96e6ea127fc15a23b735c5885475a5aaa49e5 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 22 Aug 2012 23:34:56 -0700
Subject: [PATCH 161/502] don't do anything special with lambdas on backend;
 instead render them specially in the js frontend

---
 PyTutorGAE/js/pytutor.js | 9 +++++++--
 PyTutorGAE/pg_encoder.py | 2 --
 PyTutorGAE/pg_logger.py  | 6 +-----
 3 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 0385fc3a1..966446f60 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1512,7 +1512,8 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     else if (obj[0] == 'FUNCTION') {
       assert(obj.length == 3);
 
-      var funcName = htmlspecialchars(obj[1]); // for displaying weird names like ''
+      // pretty-print lambdas and display other weird characters:
+      var funcName = htmlspecialchars(obj[1].replace('', 'λ'));
       var parentFrameID = obj[2]; // optional
 
       if (parentFrameID) {
@@ -1704,7 +1705,11 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .append('div')
     .attr('class', 'stackFrameHeader')
     .html(function(frame, i) {
-      var funcName = htmlspecialchars(frame.func_name); // might contain '<' or '>' for weird names like 
+
+      // pretty-print lambdas and display other weird characters
+      // (might contain '<' or '>' for weird names like )
+      var funcName = htmlspecialchars(frame.func_name.replace('', 'λ'));
+
       var headerLabel = funcName + '()';
 
       // only display if you're someone's parent
diff --git a/PyTutorGAE/pg_encoder.py b/PyTutorGAE/pg_encoder.py
index 3350fb3e1..8199e1cb9 100644
--- a/PyTutorGAE/pg_encoder.py
+++ b/PyTutorGAE/pg_encoder.py
@@ -168,8 +168,6 @@ def encode(self, dat):
           printed_args.extend(['**' + e for e in argspec.keywords])
 
         func_name = get_name(dat)
-        if func_name == '':
-          func_name = u"\u03BB" # for Python 3, eliminate the u prefix from the Unicode string
         pretty_name = func_name + '(' + ', '.join(printed_args) + ')'
         new_obj.extend(['FUNCTION', pretty_name, None]) # the final element will be filled in later
       elif self.is_class(dat) or self.is_instance(dat):
diff --git a/PyTutorGAE/pg_logger.py b/PyTutorGAE/pg_logger.py
index e8cb80f99..ec8390ef3 100644
--- a/PyTutorGAE/pg_logger.py
+++ b/PyTutorGAE/pg_logger.py
@@ -320,11 +320,7 @@ def create_encoded_stack_entry(cur_frame):
 
           cur_name = cur_frame.f_code.co_name
 
-          # special case for lambdas - grab their line numbers too (or not)
-          if cur_name == '':
-            # Unicode lambda :)
-            cur_name = u"\u03BB" # for Python 3, eliminate the u prefix from the Unicode string
-          elif cur_name == '':
+          if cur_name == '':
             cur_name = 'unnamed function'
 
           # encode in a JSON-friendly format now, in order to prevent ill

From a5f5e7937123d4cf370eac6aa1d480509a111128 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 22 Aug 2012 23:44:46 -0700
Subject: [PATCH 162/502] updated tests to reflect 

---
 .../tests/backend-tests/john-compose.golden   | 140 ++--
 .../tests/backend-tests/lambda_1.golden       | 324 ++++-----
 example-code/closures/closure5.golden         | 358 +++++-----
 example-code/closures/lambda-param.golden     |  24 +-
 example-code/map.golden                       | 138 ++--
 example-code/sum.golden                       | 624 +++++++++---------
 6 files changed, 804 insertions(+), 804 deletions(-)

diff --git a/PyTutorGAE/tests/backend-tests/john-compose.golden b/PyTutorGAE/tests/backend-tests/john-compose.golden
index ef90915f2..9acb62b04 100644
--- a/PyTutorGAE/tests/backend-tests/john-compose.golden
+++ b/PyTutorGAE/tests/backend-tests/john-compose.golden
@@ -79,12 +79,12 @@
         ], 
         "2": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ]
       }, 
@@ -136,12 +136,12 @@
         ], 
         "2": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ]
       }, 
@@ -198,17 +198,17 @@
         ], 
         "2": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -270,17 +270,17 @@
         ], 
         "2": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -330,12 +330,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f2", 
+          "unique_hash": "_f2", 
           "ordered_varnames": [
             "x"
           ]
@@ -359,17 +359,17 @@
         ], 
         "2": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -419,12 +419,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f2", 
+          "unique_hash": "_f2", 
           "ordered_varnames": [
             "x"
           ]
@@ -448,17 +448,17 @@
         ], 
         "2": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -508,12 +508,12 @@
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f2", 
+          "unique_hash": "_f2", 
           "ordered_varnames": [
             "x"
           ]
@@ -525,10 +525,10 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "\u03bb_f3", 
+          "unique_hash": "_f3", 
           "ordered_varnames": [
             "x"
           ]
@@ -552,17 +552,17 @@
         ], 
         "2": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -612,12 +612,12 @@
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f2", 
+          "unique_hash": "_f2", 
           "ordered_varnames": [
             "x"
           ]
@@ -629,10 +629,10 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "\u03bb_f3", 
+          "unique_hash": "_f3", 
           "ordered_varnames": [
             "x"
           ]
@@ -656,17 +656,17 @@
         ], 
         "2": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -716,12 +716,12 @@
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f2", 
+          "unique_hash": "_f2", 
           "ordered_varnames": [
             "x"
           ]
@@ -734,10 +734,10 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "\u03bb_f3", 
+          "unique_hash": "_f3", 
           "ordered_varnames": [
             "x", 
             "__return__"
@@ -762,17 +762,17 @@
         ], 
         "2": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -822,12 +822,12 @@
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f2", 
+          "unique_hash": "_f2", 
           "ordered_varnames": [
             "x"
           ]
@@ -839,10 +839,10 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "\u03bb_f4", 
+          "unique_hash": "_f4", 
           "ordered_varnames": [
             "x"
           ]
@@ -866,17 +866,17 @@
         ], 
         "2": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -926,12 +926,12 @@
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f2", 
+          "unique_hash": "_f2", 
           "ordered_varnames": [
             "x"
           ]
@@ -943,10 +943,10 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "\u03bb_f4", 
+          "unique_hash": "_f4", 
           "ordered_varnames": [
             "x"
           ]
@@ -970,17 +970,17 @@
         ], 
         "2": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -1030,12 +1030,12 @@
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f2", 
+          "unique_hash": "_f2", 
           "ordered_varnames": [
             "x"
           ]
@@ -1048,10 +1048,10 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [], 
-          "unique_hash": "\u03bb_f4", 
+          "unique_hash": "_f4", 
           "ordered_varnames": [
             "x", 
             "__return__"
@@ -1076,17 +1076,17 @@
         ], 
         "2": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           null
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -1137,12 +1137,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
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diff --git a/PyTutorGAE/tests/backend-tests/lambda_1.golden b/PyTutorGAE/tests/backend-tests/lambda_1.golden
index 913c30a55..329be1475 100644
--- a/PyTutorGAE/tests/backend-tests/lambda_1.golden
+++ b/PyTutorGAE/tests/backend-tests/lambda_1.golden
@@ -245,12 +245,12 @@
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diff --git a/example-code/closures/closure5.golden b/example-code/closures/closure5.golden
index 95ed6ae75..037cbb077 100644
--- a/example-code/closures/closure5.golden
+++ b/example-code/closures/closure5.golden
@@ -213,7 +213,7 @@
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diff --git a/example-code/map.golden b/example-code/map.golden
index 0418b1935..e0181c7ec 100644
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diff --git a/example-code/sum.golden b/example-code/sum.golden
index ba7fd8dab..f216f1ac6 100644
--- a/example-code/sum.golden
+++ b/example-code/sum.golden
@@ -245,12 +245,12 @@
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@@ -333,12 +333,12 @@
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-          "unique_hash": "\u03bb_f6", 
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           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f17", 
+          "unique_hash": "_f17", 
           "ordered_varnames": [
             "x"
           ]
@@ -7254,12 +7254,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -7329,12 +7329,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f17", 
+          "unique_hash": "_f17", 
           "ordered_varnames": [
             "x"
           ]
@@ -7363,12 +7363,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -7439,12 +7439,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f17", 
+          "unique_hash": "_f17", 
           "ordered_varnames": [
             "x", 
             "__return__"
@@ -7474,12 +7474,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -7566,12 +7566,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -7641,12 +7641,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f18", 
+          "unique_hash": "_f18", 
           "ordered_varnames": [
             "x"
           ]
@@ -7675,12 +7675,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -7750,12 +7750,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f18", 
+          "unique_hash": "_f18", 
           "ordered_varnames": [
             "x"
           ]
@@ -7784,12 +7784,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -7860,12 +7860,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f18", 
+          "unique_hash": "_f18", 
           "ordered_varnames": [
             "x", 
             "__return__"
@@ -7895,12 +7895,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -7987,12 +7987,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -8079,12 +8079,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -8154,12 +8154,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f19", 
+          "unique_hash": "_f19", 
           "ordered_varnames": [
             "x"
           ]
@@ -8188,12 +8188,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -8263,12 +8263,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f19", 
+          "unique_hash": "_f19", 
           "ordered_varnames": [
             "x"
           ]
@@ -8297,12 +8297,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -8373,12 +8373,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f19", 
+          "unique_hash": "_f19", 
           "ordered_varnames": [
             "x", 
             "__return__"
@@ -8408,12 +8408,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -8500,12 +8500,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -8575,12 +8575,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f20", 
+          "unique_hash": "_f20", 
           "ordered_varnames": [
             "x"
           ]
@@ -8609,12 +8609,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -8684,12 +8684,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f20", 
+          "unique_hash": "_f20", 
           "ordered_varnames": [
             "x"
           ]
@@ -8718,12 +8718,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -8794,12 +8794,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f20", 
+          "unique_hash": "_f20", 
           "ordered_varnames": [
             "x", 
             "__return__"
@@ -8829,12 +8829,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -8921,12 +8921,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -9013,12 +9013,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -9088,12 +9088,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f21", 
+          "unique_hash": "_f21", 
           "ordered_varnames": [
             "x"
           ]
@@ -9122,12 +9122,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -9197,12 +9197,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f21", 
+          "unique_hash": "_f21", 
           "ordered_varnames": [
             "x"
           ]
@@ -9231,12 +9231,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -9307,12 +9307,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f21", 
+          "unique_hash": "_f21", 
           "ordered_varnames": [
             "x", 
             "__return__"
@@ -9342,12 +9342,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -9434,12 +9434,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -9509,12 +9509,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f22", 
+          "unique_hash": "_f22", 
           "ordered_varnames": [
             "x"
           ]
@@ -9543,12 +9543,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -9618,12 +9618,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f22", 
+          "unique_hash": "_f22", 
           "ordered_varnames": [
             "x"
           ]
@@ -9652,12 +9652,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -9728,12 +9728,12 @@
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
-          "func_name": "\u03bb", 
+          "func_name": "", 
           "is_zombie": false, 
           "parent_frame_id_list": [
             1
           ], 
-          "unique_hash": "\u03bb_f22", 
+          "unique_hash": "_f22", 
           "ordered_varnames": [
             "x", 
             "__return__"
@@ -9763,12 +9763,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -9855,12 +9855,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -9947,12 +9947,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 
@@ -10041,12 +10041,12 @@
         ], 
         "3": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ], 
         "4": [
           "FUNCTION", 
-          "\u03bb(x)", 
+          "(x)", 
           1
         ]
       }, 

From 91d41453fd3c2cc41dadcb8c74b52524d9f8cd51 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 23 Aug 2012 00:13:58 -0700
Subject: [PATCH 163/502] more

---
 PyTutorGAE/logger/gae_logger.py               |  4 +-
 .../tests/backend-tests/pie-test.golden       | 91 +++++++++++++++++++
 PyTutorGAE/tests/backend-tests/pie-test.txt   |  3 +
 3 files changed, 97 insertions(+), 1 deletion(-)
 create mode 100644 PyTutorGAE/tests/backend-tests/pie-test.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/pie-test.txt

diff --git a/PyTutorGAE/logger/gae_logger.py b/PyTutorGAE/logger/gae_logger.py
index ef1c083f0..77b59c172 100644
--- a/PyTutorGAE/logger/gae_logger.py
+++ b/PyTutorGAE/logger/gae_logger.py
@@ -9,12 +9,14 @@ class VisualizerRequest(db.Model):
   cumulative_mode = db.BooleanProperty(requred=True)
   user_ip_addr = db.StringProperty(required=True)
   http_referer = db.StringProperty(required=True)
+  app_id = db.StringProperty(required=True)
   request_timestamp = db.DateTimeProperty(auto_now_add=True) # always set timestamp to NOW!
 
 x = VisualizerRequest(user_script=db.Text(u'print "hello world"\n', encoding='utf_8'),
                       cumulative_mode=True
                       user_ip_addr='18.239.4.100',
-                      http_referer='http://www.google.com/?magic-search')
+                      http_referer='http://www.google.com/?magic-search',
+                      app_id='pgbovine test')
 
 x.put()
 
diff --git a/PyTutorGAE/tests/backend-tests/pie-test.golden b/PyTutorGAE/tests/backend-tests/pie-test.golden
new file mode 100644
index 000000000..c595719af
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/pie-test.golden
@@ -0,0 +1,91 @@
+{
+  "code": "import operator\nfrom math import pi, e\npie = operator.add(pi, e)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "operator"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "operator": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "module", 
+          "operator"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "operator", 
+        "pi", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "operator": [
+          "REF", 
+          1
+        ], 
+        "pi": 3.1416, 
+        "e": 2.7183
+      }, 
+      "heap": {
+        "1": [
+          "module", 
+          "operator"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "operator", 
+        "pi", 
+        "e", 
+        "pie"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "operator": [
+          "REF", 
+          1
+        ], 
+        "pi": 3.1416, 
+        "e": 2.7183, 
+        "pie": 5.8599
+      }, 
+      "heap": {
+        "1": [
+          "module", 
+          "operator"
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/pie-test.txt b/PyTutorGAE/tests/backend-tests/pie-test.txt
new file mode 100644
index 000000000..a73f77ec2
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/pie-test.txt
@@ -0,0 +1,3 @@
+import operator
+from math import pi, e
+pie = operator.add(pi, e)

From e028b14f4757fdc11e3d98018df41cb6be7448fb Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 23 Aug 2012 10:48:59 -0700
Subject: [PATCH 164/502] more robust lambda fix

---
 PyTutorGAE/js/pytutor.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 966446f60..859fcbca2 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1513,7 +1513,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       assert(obj.length == 3);
 
       // pretty-print lambdas and display other weird characters:
-      var funcName = htmlspecialchars(obj[1].replace('', 'λ'));
+      var funcName = htmlspecialchars(obj[1]).replace('<lambda>', 'λ');
       var parentFrameID = obj[2]; // optional
 
       if (parentFrameID) {
@@ -1708,7 +1708,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
       // pretty-print lambdas and display other weird characters
       // (might contain '<' or '>' for weird names like )
-      var funcName = htmlspecialchars(frame.func_name.replace('', 'λ'));
+      var funcName = htmlspecialchars(frame.func_name).replace('<lambda>', 'λ');
 
       var headerLabel = funcName + '()';
 

From 4fb1fb801ee0e80dd9e1ef6bc405bebd633ae15e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 23 Aug 2012 11:00:38 -0700
Subject: [PATCH 165/502] made web_exec.py more robust w.r.t. cumulative_mode

---
 PyTutorGAE/web_exec.py | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/PyTutorGAE/web_exec.py b/PyTutorGAE/web_exec.py
index f9b6a523a..3afedc14c 100644
--- a/PyTutorGAE/web_exec.py
+++ b/PyTutorGAE/web_exec.py
@@ -16,12 +16,18 @@ def cgi_finalizer(input_code, output_trace):
   print(json_output)
 
 
+cumulative_mode = False
+
+# If you pass in a filename as an argument, then process script from that file ...
 if len(sys.argv) > 1:
   user_script = open(sys.argv[1]).read()
+
+# Otherwise act like a CGI script ...
 else:
   form = cgi.FieldStorage()
   user_script = form['user_script'].value
-  # convert from string to a Python boolean ...
-  cumulative_mode = (form['cumulative_mode'].value == 'true')
+  if 'cumulative_mode' in form:
+    # convert from string to a Python boolean ...
+    cumulative_mode = (form['cumulative_mode'].value == 'true')
 
 pg_logger.exec_script_str(user_script, cumulative_mode, cgi_finalizer)

From 7c268b8f0ddefb1a64ee747e1cba93d796af4222 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 23 Aug 2012 11:26:51 -0700
Subject: [PATCH 166/502] added custom query logging code using sqlite

---
 PyTutorGAE/create_log_db.py | 27 +++++++++++++++++++++
 PyTutorGAE/web_exec.py      | 47 +++++++++++++++++++++++++++++++++++--
 2 files changed, 72 insertions(+), 2 deletions(-)
 create mode 100644 PyTutorGAE/create_log_db.py

diff --git a/PyTutorGAE/create_log_db.py b/PyTutorGAE/create_log_db.py
new file mode 100644
index 000000000..d798c2fa8
--- /dev/null
+++ b/PyTutorGAE/create_log_db.py
@@ -0,0 +1,27 @@
+# Setup sqlite database to support query logging from web_exec.py
+
+import os, sqlite
+
+DB_FILE = 'opt-query-log.sqlite3'
+
+def create_db():
+  con = sqlite3.connect(DB_FILE)
+  cur = con.cursor()
+
+  cur.execute('''CREATE TABLE query_log
+    (id INTEGER PRIMARY KEY,
+     timestamp TEXT,
+     ip_addr TEXT,
+     http_user_agent TEXT,
+     http_referer TEXT,
+     user_script TEXT,
+     cumulative_mode INTEGER''')
+  con.commit()
+  cur.close()
+
+
+if __name__ == "__main__":
+  assert not os.path.exists(DB_FILE)
+  create_db()
+  print 'Created', DB_FILE
+
diff --git a/PyTutorGAE/web_exec.py b/PyTutorGAE/web_exec.py
index 3afedc14c..ebc4249c5 100644
--- a/PyTutorGAE/web_exec.py
+++ b/PyTutorGAE/web_exec.py
@@ -1,6 +1,16 @@
 # 
 
-# Minimal CGI script for Online Python Tutor (v3).
+# Minimal CGI script for Online Python Tutor (v3), tested under Python 2 and 3
+
+# If you want to run this script, then you'll need to change the
+# shebang #! line at the top of this file to point to your system's Python.
+#
+# Also, check CGI execute permission in your script directory.
+# You might need to create an .htaccess file like the following:
+#
+#   Options +ExecCGI
+#   AddHandler cgi-script .py
+
 
 import cgi
 import json
@@ -8,10 +18,41 @@
 import sys
 
 
+# set to true if you want to log queries in DB_FILE 
+LOG_QUERIES = True
+
+if LOG_QUERIES:
+  import os, datetime, create_log_db
+
+
 def cgi_finalizer(input_code, output_trace):
   """Write JSON output for js/pytutor.js as a CGI result."""
   ret = dict(code=input_code, trace=output_trace)
   json_output = json.dumps(ret, indent=None) # use indent=None for most compact repr
+
+  if LOG_QUERIES:
+    # just to be paranoid, don't croak the whole program just
+    # because there's some error in logging it to the database
+    try:
+      # log queries into sqlite database.
+      # make sure that your web server's account has write permissions
+      # in the current directory, for logging to work properly
+      con = sqlite3.connect(create_log_db.DB_FILE)
+      cur = con.cursor()
+
+      cur.execute("INSERT INTO query_log VALUES (NULL, ?, ?, ?, ?, ?, ?)",
+                  datetime.datetime.now(),
+                  os.environ.get("REMOTE_ADDR", "N/A"),
+                  os.environ.get("HTTP_USER_AGENT", "N/A"),
+                  os.environ.get("HTTP_REFERER", "N/A"),
+                  user_script,
+                  int(cumulative_mode))
+      con.commit()
+      cur.close()
+    except:
+      # this is bad form, but silently fail on error ...
+      pass
+
   print("Content-type: text/plain; charset=iso-8859-1\n")
   print(json_output)
 
@@ -22,7 +63,9 @@ def cgi_finalizer(input_code, output_trace):
 if len(sys.argv) > 1:
   user_script = open(sys.argv[1]).read()
 
-# Otherwise act like a CGI script ...
+# Otherwise act like a CGI script with parameters:
+#   user_script
+#   cumulative_mode
 else:
   form = cgi.FieldStorage()
   user_script = form['user_script'].value

From cb326379857ed5b568da5b367a0a79281079935f Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 23 Aug 2012 11:55:56 -0700
Subject: [PATCH 167/502] typo fixes

---
 PyTutorGAE/create_log_db.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/PyTutorGAE/create_log_db.py b/PyTutorGAE/create_log_db.py
index d798c2fa8..80f9b4545 100644
--- a/PyTutorGAE/create_log_db.py
+++ b/PyTutorGAE/create_log_db.py
@@ -1,6 +1,6 @@
 # Setup sqlite database to support query logging from web_exec.py
 
-import os, sqlite
+import os, sqlite3
 
 DB_FILE = 'opt-query-log.sqlite3'
 
@@ -15,7 +15,7 @@ def create_db():
      http_user_agent TEXT,
      http_referer TEXT,
      user_script TEXT,
-     cumulative_mode INTEGER''')
+     cumulative_mode INTEGER)''')
   con.commit()
   cur.close()
 

From 415e1fbf852e12ff540c171950a43e83a315135d Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 23 Aug 2012 14:47:32 -0700
Subject: [PATCH 168/502] unicode!!!

---
 PyTutorGAE/js/pytutor.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 859fcbca2..eca5c3538 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1513,7 +1513,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       assert(obj.length == 3);
 
       // pretty-print lambdas and display other weird characters:
-      var funcName = htmlspecialchars(obj[1]).replace('<lambda>', 'λ');
+      var funcName = htmlspecialchars(obj[1]).replace('<lambda>', '\u03bb');
       var parentFrameID = obj[2]; // optional
 
       if (parentFrameID) {
@@ -1708,7 +1708,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
       // pretty-print lambdas and display other weird characters
       // (might contain '<' or '>' for weird names like )
-      var funcName = htmlspecialchars(frame.func_name).replace('<lambda>', 'λ');
+      var funcName = htmlspecialchars(frame.func_name).replace('<lambda>', '\u03bb');
 
       var headerLabel = funcName + '()';
 

From df314b62e1f52f82d363ba690091b0d2e3b42dfe Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 23 Aug 2012 15:45:49 -0700
Subject: [PATCH 169/502] merge in john's changes to the logging code

---
 PyTutorGAE/create_log_db.py |  2 +-
 PyTutorGAE/web_exec.py      | 18 +++++++++---------
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/PyTutorGAE/create_log_db.py b/PyTutorGAE/create_log_db.py
index 80f9b4545..52e2f13f8 100644
--- a/PyTutorGAE/create_log_db.py
+++ b/PyTutorGAE/create_log_db.py
@@ -23,5 +23,5 @@ def create_db():
 if __name__ == "__main__":
   assert not os.path.exists(DB_FILE)
   create_db()
-  print 'Created', DB_FILE
+  print('Created ' + DB_FILE)
 
diff --git a/PyTutorGAE/web_exec.py b/PyTutorGAE/web_exec.py
index ebc4249c5..4ee89a00d 100644
--- a/PyTutorGAE/web_exec.py
+++ b/PyTutorGAE/web_exec.py
@@ -22,7 +22,7 @@
 LOG_QUERIES = True
 
 if LOG_QUERIES:
-  import os, datetime, create_log_db
+  import os, datetime, create_log_db, sqlite3
 
 
 def cgi_finalizer(input_code, output_trace):
@@ -41,17 +41,17 @@ def cgi_finalizer(input_code, output_trace):
       cur = con.cursor()
 
       cur.execute("INSERT INTO query_log VALUES (NULL, ?, ?, ?, ?, ?, ?)",
-                  datetime.datetime.now(),
-                  os.environ.get("REMOTE_ADDR", "N/A"),
-                  os.environ.get("HTTP_USER_AGENT", "N/A"),
-                  os.environ.get("HTTP_REFERER", "N/A"),
-                  user_script,
-                  int(cumulative_mode))
+                  (datetime.datetime.now(),
+                   os.environ.get("REMOTE_ADDR", "N/A"),
+                   os.environ.get("HTTP_USER_AGENT", "N/A"),
+                   os.environ.get("HTTP_REFERER", "N/A"),
+                   user_script,
+                   int(cumulative_mode)))
       con.commit()
       cur.close()
-    except:
+    except Exception as err:
       # this is bad form, but silently fail on error ...
-      pass
+      print(err)
 
   print("Content-type: text/plain; charset=iso-8859-1\n")
   print(json_output)

From 940983f5d97e9776c15cd53dac1c51e588255b62 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 23 Aug 2012 22:53:30 -0700
Subject: [PATCH 170/502] properly render tab characters in output code display

---
 PyTutorGAE/js/pytutor.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index eca5c3538..249848892 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -1950,6 +1950,9 @@ function htmlspecialchars(str) {
 
     // replace spaces:
     str = str.replace(/ /g, " ");
+
+    // replace tab as four spaces:
+    str = str.replace(/\t/g, "    ");
   }
   return str;
 }

From 661e83420e72d06b827298e02d631c021fa779db Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 25 Aug 2012 11:24:55 -0700
Subject: [PATCH 171/502] added a scheme-like test

---
 .../tests/backend-tests/ling-scheme-1.golden  | 4020 +++++++++++++++++
 .../tests/backend-tests/ling-scheme-1.txt     |    7 +
 2 files changed, 4027 insertions(+)
 create mode 100644 PyTutorGAE/tests/backend-tests/ling-scheme-1.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/ling-scheme-1.txt

diff --git a/PyTutorGAE/tests/backend-tests/ling-scheme-1.golden b/PyTutorGAE/tests/backend-tests/ling-scheme-1.golden
new file mode 100644
index 000000000..a775366a0
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/ling-scheme-1.golden
@@ -0,0 +1,4020 @@
+{
+  "code": "def repeat(f, n):\n  if n == 0:\n    return []\n  else:\n    return [f()] + repeat(f, n - 1)\n\nrepeat(lambda : 5, 5)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "repeat"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "repeat": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "repeat(f, n)", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "repeat"
+      ], 
+      "stdout": "", 
+      "func_name": "repeat", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "f": [
+              "REF", 
+              2
+            ], 
+            "n": 5
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "repeat", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "repeat_f1", 
+          "ordered_varnames": [
+            "f", 
+            "n"
+          ]
+        }
+      ], 
+      "globals": {
+        "repeat": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "repeat(f, n)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "()", 
+          null
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "repeat"
+      ], 
+      "stdout": "", 
+      "func_name": "repeat", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "f": [
+              "REF", 
+              2
+            ], 
+            "n": 5
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "repeat", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "repeat_f1", 
+          "ordered_varnames": [
+            "f", 
+            "n"
+          ]
+        }
+      ], 
+      "globals": {
+        "repeat": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "repeat(f, n)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "()", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "repeat"
+      ], 
+      "stdout": "", 
+      "func_name": "repeat", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "f": [
+              "REF", 
+              2
+            ], 
+            "n": 5
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "repeat", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "repeat_f1", 
+          "ordered_varnames": [
+            "f", 
+            "n"
+          ]
+        }
+      ], 
+      "globals": {
+        "repeat": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "repeat(f, n)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "()", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "repeat"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "f": [
+              "REF", 
+              2
+            ], 
+            "n": 5
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "repeat", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "repeat_f1", 
+          "ordered_varnames": [
+            "f", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "repeat": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "repeat(f, n)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "()", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "repeat"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "f": [
+              "REF", 
+              2
+            ], 
+            "n": 5
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "repeat", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "repeat_f1", 
+          "ordered_varnames": [
+            "f", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "repeat": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "repeat(f, n)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "()", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "repeat"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "f": [
+              "REF", 
+              2
+            ], 
+            "n": 5
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "repeat", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "repeat_f1", 
+          "ordered_varnames": [
+            "f", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": 5
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2", 
+          "ordered_varnames": [
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "repeat": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "repeat(f, n)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "()", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "repeat"
+      ], 
+      "stdout": "", 
+      "func_name": "repeat", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "f": [
+              "REF", 
+              2
+            ], 
+            "n": 5
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "repeat", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "repeat_f1", 
+          "ordered_varnames": [
+            "f", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "f": [
+              "REF", 
+              2
+            ], 
+            "n": 4
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "repeat", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "repeat_f3", 
+          "ordered_varnames": [
+            "f", 
+            "n"
+          ]
+        }
+      ], 
+      "globals": {
+        "repeat": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "repeat(f, n)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "()", 
+          null
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "repeat"
+      ], 
+      "stdout": "", 
+      "func_name": "repeat", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "f": [
+              "REF", 
+              2
+            ], 
+            "n": 5
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "repeat", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "repeat_f1", 
+          "ordered_varnames": [
+            "f", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "f": [
+              "REF", 
+              2
+            ], 
+            "n": 4
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "repeat", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "repeat_f3", 
+          "ordered_varnames": [
+            "f", 
+            "n"
+          ]
+        }
+      ], 
+      "globals": {
+        "repeat": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "repeat(f, n)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "()", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "repeat"
+      ], 
+      "stdout": "", 
+      "func_name": "repeat", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "f": [
+              "REF", 
+              2
+            ], 
+            "n": 5
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "repeat", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "repeat_f1", 
+          "ordered_varnames": [
+            "f", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "f": [
+              "REF", 
+              2
+            ], 
+            "n": 4
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "repeat", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "repeat_f3", 
+          "ordered_varnames": [
+            "f", 
+            "n"
+          ]
+        }
+      ], 
+      "globals": {
+        "repeat": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "repeat(f, n)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "()", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "repeat"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "f": [
+              "REF", 
+              2
+            ], 
+            "n": 5
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "repeat", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "repeat_f1", 
+          "ordered_varnames": [
+            "f", 
+            "n"
+          ]
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diff --git a/PyTutorGAE/tests/backend-tests/ling-scheme-1.txt b/PyTutorGAE/tests/backend-tests/ling-scheme-1.txt
new file mode 100644
index 000000000..254102edc
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/ling-scheme-1.txt
@@ -0,0 +1,7 @@
+def repeat(f, n):
+  if n == 0:
+    return []
+  else:
+    return [f()] + repeat(f, n - 1)
+
+repeat(lambda : 5, 5)

From 1a063e10202776e94151c465a93f02d1396fa9cb Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 25 Aug 2012 11:40:33 -0700
Subject: [PATCH 172/502] added more scheme-like tests

---
 .../tests/backend-tests/ling-scheme-2.golden  | 3788 ++++++++
 .../tests/backend-tests/ling-scheme-2.txt     |   10 +
 .../tests/backend-tests/ling-scheme-3.golden  | 8612 +++++++++++++++++
 .../tests/backend-tests/ling-scheme-3.txt     |   21 +
 4 files changed, 12431 insertions(+)
 create mode 100644 PyTutorGAE/tests/backend-tests/ling-scheme-2.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/ling-scheme-2.txt
 create mode 100644 PyTutorGAE/tests/backend-tests/ling-scheme-3.golden
 create mode 100644 PyTutorGAE/tests/backend-tests/ling-scheme-3.txt

diff --git a/PyTutorGAE/tests/backend-tests/ling-scheme-2.golden b/PyTutorGAE/tests/backend-tests/ling-scheme-2.golden
new file mode 100644
index 000000000..add7f461f
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/ling-scheme-2.golden
@@ -0,0 +1,3788 @@
+{
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diff --git a/PyTutorGAE/tests/backend-tests/ling-scheme-2.txt b/PyTutorGAE/tests/backend-tests/ling-scheme-2.txt
new file mode 100644
index 000000000..b94897002
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/ling-scheme-2.txt
@@ -0,0 +1,10 @@
+def iota(n):
+  def loop(acc, k):
+    if k == n:
+      return list(reversed(acc))
+    else:
+      return loop([k] + acc, k + 1)
+  return loop([], 0)
+
+result = iota(5)
+
diff --git a/PyTutorGAE/tests/backend-tests/ling-scheme-3.golden b/PyTutorGAE/tests/backend-tests/ling-scheme-3.golden
new file mode 100644
index 000000000..be3b46e8e
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/ling-scheme-3.golden
@@ -0,0 +1,8612 @@
+{
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+        ], 
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+          null
+        ], 
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+        ], 
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+        ], 
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+          2
+        ], 
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+          3
+        ], 
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+          [
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+          ], 
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+          ]
+        ], 
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+        ], 
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+          [
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+            9
+          ]
+        ], 
+        "26": [
+          "LIST"
+        ]
+      }, 
+      "line": 9, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "map", 
+        "append", 
+        "pairs"
+      ], 
+      "stdout": "", 
+      "func_name": "append", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "pairs", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "pairs_f1_p", 
+          "ordered_varnames": [
+            "xs"
+          ]
+        }, 
+        {
+          "frame_id": 14, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              13
+            ], 
+            "ys": [
+              "REF", 
+              24
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "append", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "append_f14", 
+          "ordered_varnames": [
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+            "ys"
+          ]
+        }, 
+        {
+          "frame_id": 15, 
+          "encoded_locals": {
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+              27
+            ], 
+            "xs": [
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+              24
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+          "is_highlighted": true, 
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+          "unique_hash": "append_f15", 
+          "ordered_varnames": [
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+            "ys", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
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+          1
+        ], 
+        "pairs": [
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+          3
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+        ]
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+          1, 
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+        ], 
+        "13": [
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+          [
+            "REF", 
+            7
+          ], 
+          [
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+            9
+          ]
+        ], 
+        "17": [
+          "LIST", 
+          2, 
+          3
+        ], 
+        "24": [
+          "LIST", 
+          [
+            "REF", 
+            17
+          ]
+        ], 
+        "25": [
+          "LIST", 
+          [
+            "REF", 
+            9
+          ]
+        ], 
+        "27": [
+          "LIST", 
+          [
+            "REF", 
+            9
+          ], 
+          [
+            "REF", 
+            17
+          ]
+        ]
+      }, 
+      "line": 11, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "map", 
+        "append", 
+        "pairs"
+      ], 
+      "stdout": "", 
+      "func_name": "append", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "pairs", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "pairs_f1_p", 
+          "ordered_varnames": [
+            "xs"
+          ]
+        }, 
+        {
+          "frame_id": 14, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              28
+            ], 
+            "xs": [
+              "REF", 
+              13
+            ], 
+            "ys": [
+              "REF", 
+              24
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "append", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "append_f14", 
+          "ordered_varnames": [
+            "xs", 
+            "ys", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "map": [
+          "REF", 
+          1
+        ], 
+        "pairs": [
+          "REF", 
+          3
+        ], 
+        "append": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "map(f, xs)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "append(xs, ys)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "pairs(xs)", 
+          null
+        ], 
+        "4": [
+          "LIST", 
+          1, 
+          2, 
+          3
+        ], 
+        "7": [
+          "LIST", 
+          1, 
+          2
+        ], 
+        "9": [
+          "LIST", 
+          1, 
+          3
+        ], 
+        "13": [
+          "LIST", 
+          [
+            "REF", 
+            7
+          ], 
+          [
+            "REF", 
+            9
+          ]
+        ], 
+        "17": [
+          "LIST", 
+          2, 
+          3
+        ], 
+        "24": [
+          "LIST", 
+          [
+            "REF", 
+            17
+          ]
+        ], 
+        "28": [
+          "LIST", 
+          [
+            "REF", 
+            7
+          ], 
+          [
+            "REF", 
+            9
+          ], 
+          [
+            "REF", 
+            17
+          ]
+        ]
+      }, 
+      "line": 11, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "map", 
+        "append", 
+        "pairs"
+      ], 
+      "stdout": "", 
+      "func_name": "pairs", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              28
+            ], 
+            "xs": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "pairs", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "pairs_f1_p", 
+          "ordered_varnames": [
+            "xs", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "map": [
+          "REF", 
+          1
+        ], 
+        "pairs": [
+          "REF", 
+          3
+        ], 
+        "append": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "map(f, xs)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "append(xs, ys)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "pairs(xs)", 
+          null
+        ], 
+        "4": [
+          "LIST", 
+          1, 
+          2, 
+          3
+        ], 
+        "7": [
+          "LIST", 
+          1, 
+          2
+        ], 
+        "9": [
+          "LIST", 
+          1, 
+          3
+        ], 
+        "17": [
+          "LIST", 
+          2, 
+          3
+        ], 
+        "28": [
+          "LIST", 
+          [
+            "REF", 
+            7
+          ], 
+          [
+            "REF", 
+            9
+          ], 
+          [
+            "REF", 
+            17
+          ]
+        ]
+      }, 
+      "line": 19, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "map", 
+        "append", 
+        "pairs", 
+        "result"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              28
+            ], 
+            "xs": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "pairs", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "pairs_f1_p_z", 
+          "ordered_varnames": [
+            "xs", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "map": [
+          "REF", 
+          1
+        ], 
+        "pairs": [
+          "REF", 
+          3
+        ], 
+        "result": [
+          "REF", 
+          28
+        ], 
+        "append": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "map(f, xs)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "append(xs, ys)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "pairs(xs)", 
+          null
+        ], 
+        "4": [
+          "LIST", 
+          1, 
+          2, 
+          3
+        ], 
+        "7": [
+          "LIST", 
+          1, 
+          2
+        ], 
+        "9": [
+          "LIST", 
+          1, 
+          3
+        ], 
+        "17": [
+          "LIST", 
+          2, 
+          3
+        ], 
+        "28": [
+          "LIST", 
+          [
+            "REF", 
+            7
+          ], 
+          [
+            "REF", 
+            9
+          ], 
+          [
+            "REF", 
+            17
+          ]
+        ]
+      }, 
+      "line": 21, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/PyTutorGAE/tests/backend-tests/ling-scheme-3.txt b/PyTutorGAE/tests/backend-tests/ling-scheme-3.txt
new file mode 100644
index 000000000..8ae512cdb
--- /dev/null
+++ b/PyTutorGAE/tests/backend-tests/ling-scheme-3.txt
@@ -0,0 +1,21 @@
+def map(f, xs):
+  if xs == []:
+    return []
+  else:
+    return [f(xs[0])] + map(f, xs[1:])
+
+def append(xs, ys):
+  if xs == []:
+    return ys
+  else:
+    return [xs[0]] + append(xs[1:], ys)
+
+def pairs(xs):
+  if xs == []:
+    return []
+  elif xs[1:] == []:
+    return []
+  else:
+    return append(map(lambda x: [xs[0], x], xs[1:]), pairs(xs[1:]))
+
+result = pairs([1, 2, 3])

From db8092ed42e1e66bc6baa61cd4dc63d275cad56b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 28 Aug 2012 14:29:11 -0700
Subject: [PATCH 173/502] prepare for CSS encapsulation work

---
 .../css/2012-08-29-CSS-encapsulation/README   |  46 ++
 .../papajohn-pytutor.css                      | 487 ++++++++++++++++++
 2 files changed, 533 insertions(+)
 create mode 100644 PyTutorGAE/css/2012-08-29-CSS-encapsulation/README
 create mode 100644 PyTutorGAE/css/2012-08-29-CSS-encapsulation/papajohn-pytutor.css

diff --git a/PyTutorGAE/css/2012-08-29-CSS-encapsulation/README b/PyTutorGAE/css/2012-08-29-CSS-encapsulation/README
new file mode 100644
index 000000000..870a0db74
--- /dev/null
+++ b/PyTutorGAE/css/2012-08-29-CSS-encapsulation/README
@@ -0,0 +1,46 @@
+From me:
+
+I just thought of a possible solution for those nasty CSS clashes that
+you guys are encountering:
+
+I could prefix all of my python tutor CSS rules with something like
+div.ExecutionVisualizer. e.g., 
+
+div.ExecutionVisualizer table td {
+  ... blah blah ...
+}
+
+and then when the user creates an ExecutionVisualizer object with
+JavaScript and passes it a div, I use JavaScript to set its class to
+"ExecutionVisualizer".
+
+Thoughts?
+
+
+---
+From John:
+
+That's a good idea.  It would also be great to establish two different
+top-level div classes: one for embedded and one for stand-alone
+visualizers.  Embedded visualizers typically need to be more densely
+laid out, otherwise they eat up the entire page.  You can see my css
+changes for embedding in the master branch of my fork.
+
+https://github.com/papajohn/OnlinePythonTutor/blob/master/PyTutorGAE/css/pytutor.css
+[downloaded as papajohn-pytutor.css]
+
+Ideally, I'd add the option of creating an embedded visualizer or a
+stand-alone one on construction, and each would be allowed to have
+different styles but mostly share the same styles.
+
+
+---
+From Sean:
+
+Philip, just wondering, could you just make a new container div with the
+right class, and stick it into the div passed to your code?  This might
+be easier than fiddling with the class on the div the user gives, and
+I'm also wondering whether there could be unforeseen interactions with
+other classes that might have been prespecified on that div. I don't
+know what the downsides of the new approach are, though.
+
diff --git a/PyTutorGAE/css/2012-08-29-CSS-encapsulation/papajohn-pytutor.css b/PyTutorGAE/css/2012-08-29-CSS-encapsulation/papajohn-pytutor.css
new file mode 100644
index 000000000..87a5607dc
--- /dev/null
+++ b/PyTutorGAE/css/2012-08-29-CSS-encapsulation/papajohn-pytutor.css
@@ -0,0 +1,487 @@
+/*
+
+Online Python Tutor
+https://github.com/pgbovine/OnlinePythonTutor/
+
+Copyright (C) 2010-2012 Philip J. Guo (philip@pgbovine.net)
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+*/
+
+/* Most recent color scheme redesign: 2012-08-19 */
+
+table.visualizer {
+  font-family: Helvetica, sans-serif;
+  font-size: 10pt;
+}
+
+
+td#stack_td,
+td#heap_td {
+  vertical-align:top;
+  font-size: 10pt; /* don't make fonts in the heap so big! */
+}
+
+#dataViz {
+  margin-left: 30px;
+}
+
+table.frameDataViz {
+  border-spacing: 0px;
+  font-size: 12pt;
+  margin-top: 5px;
+  margin-left: 15px;
+  background-color: #dddddd;
+  padding: 5px;
+}
+
+table.frameDataViz td.varname {
+  text-align: right;
+  padding: 5px;
+  padding-right: 8px;
+  border-right: 1px dashed #888888;
+}
+
+table.frameDataViz td.val {
+  padding-left: 8px;
+  padding-right: 5px;
+
+  padding-top: 8px;
+  padding-bottom: 8px;
+}
+
+div#pyCodeOutputDiv {
+  max-width: 550px;
+  max-height: 450px;
+  overflow: auto;
+}
+
+table#pyCodeOutput {
+  font-family: Andale mono, monospace;
+  font-size: 11pt;
+  line-height: 1.1em;
+  border-spacing: 0px;
+  border-top: 1px solid #999999;
+  padding-top: 3px;
+  border-bottom: 1px solid #999999;
+  margin: 6px auto; /* Center code in its pane */
+}
+
+/* don't wrap lines within code output ... FORCE scrollbars to appear */
+table#pyCodeOutput td {
+  white-space: nowrap;
+}
+
+table#pyCodeOutput .lineNo {
+  background-color:#FFFFFF;
+  color:#AAAAAA;
+  margin:0;
+  padding:0.2em;
+  padding-right:0.5em;
+  text-align:right;
+  width:2.1em;
+}
+
+table#pyCodeOutput .cod {
+  /*font-weight: bold;*/
+  margin-left: 3px;
+  padding-left: 7px;
+  text-align: left; /* necessary or else doesn't work properly in IE */
+}
+
+div#editCodeLinkDiv {
+  text-align: center;
+  margin: 12px auto;
+}
+
+#editCodeLinkOnError {
+  color: #142B69;
+  font-size: 9px;
+}
+
+#errorOutput {
+  color: #d03939;
+  /*background-color: #F87D76;*/
+  font-size: 12pt;
+  padding: 2px;
+  line-height: 1.5em;
+  margin-bottom: 4px;
+}
+
+button.bigBtn {
+  font-size: 12pt;
+  padding: 5px;
+}
+
+button.medBtn {
+  font-size: 12pt;
+  padding: 3px;
+}
+
+
+/* VCR control buttons for stepping through execution */
+
+#vcrControls {
+  margin: 15px auto;
+  width: 100%;
+  text-align: center;
+}
+
+#vcrControls button {
+  margin-left: 5px;
+  margin-right: 5px;
+}
+
+#pyStdout {
+  border: 1px solid #999999;
+  font-size: 12pt;
+  padding: 4px;
+  font-family: Andale mono, monospace;
+}
+
+.vizFrame {
+  margin-bottom: 20px;
+  padding-left: 8px;
+  border-left: 2px solid #cccccc;
+}
+
+
+/* Rendering of primitive types */
+
+.nullObj {
+  font-size: 8pt;
+}
+
+/*
+.numberObj {
+  font-size: 10pt;
+}
+
+.boolObj {
+  font-size: 10pt;
+}
+*/
+
+.stringObj, .customObj, .funcObj {
+  font-family: Andale mono, monospace;
+  white-space: nowrap;
+}
+
+.retval {
+  font-size: 9pt;
+}
+
+
+/* Rendering of basic compound types */
+
+table.listTbl, table.tupleTbl, table.setTbl {
+  background-color: #ffffc6;
+}
+
+
+table.listTbl {
+  border: 0px solid black;
+  border-spacing: 0px;
+}
+
+table.listTbl td.listHeader,
+table.tupleTbl td.tupleHeader {
+  padding-left: 4px;
+  padding-top: 2px;
+  padding-bottom: 3px;
+  font-size: 8pt;
+  color: #777;
+  text-align: left;
+  border-left: 1px solid #555555;
+}
+
+table.tupleTbl {
+  border-spacing: 0px;
+  color: black;
+
+  border-bottom: 1px solid #555555; /* must match td.tupleHeader border */
+  border-top: 1px solid #555555; /* must match td.tupleHeader border */
+  border-right: 1px solid #555555; /* must match td.tupleHeader border */
+}
+
+
+table.listTbl td.listElt {
+  border-bottom: 1px solid #555555; /* must match td.listHeader border */
+  border-left: 1px solid #555555; /* must match td.listHeader border */
+}
+
+table.tupleTbl td.tupleElt {
+  border-left: 1px solid #555555; /* must match td.tupleHeader border */
+}
+
+table.customObjTbl {
+  background-color: white;
+  color: black;
+  border: 1px solid black;
+}
+
+table.customObjTbl td.customObjElt {
+  padding: 5px;
+}
+
+table.listTbl td.listElt,
+table.tupleTbl td.tupleElt {
+  padding-top: 0px;
+  padding-bottom: 8px;
+  padding-left: 10px;
+  padding-right: 10px;
+  vertical-align: bottom;
+}
+
+table.setTbl {
+  border: 1px solid #555555;
+  border-spacing: 0px;
+  text-align: center;
+}
+
+table.setTbl td.setElt {
+  padding: 8px;
+}
+
+
+table.dictTbl,
+table.instTbl,
+table.classTbl {
+  border-spacing: 1px;
+}
+
+table.dictTbl td.dictKey,
+table.instTbl td.instKey,
+table.classTbl td.classKey {
+  background-color: #faebbf;
+}
+
+table.dictTbl td.dictVal,
+table.instTbl td.instVal,
+table.classTbl td.classVal {
+  background-color: #ffffc6;
+}
+
+
+table.dictTbl td.dictKey,
+table.instTbl td.instKey,
+table.classTbl td.classKey {
+  padding-top: 12px /*15px*/;
+  padding-bottom: 5px;
+  padding-left: 10px;
+  padding-right: 4px;
+
+  text-align: right;
+}
+
+table.dictTbl td.dictVal,
+table.instTbl td.instVal,
+table.classTbl td.classVal {
+  padding-top: 12px /*15px*/;
+  padding-bottom: 5px;
+  padding-right: 10px;
+  padding-left: 4px;
+}
+
+
+table.classTbl td,
+table.instTbl td {
+  border-bottom: 1px #888 solid;
+}
+
+table.classTbl td.classVal,
+table.instTbl td.instVal {
+  border-left: 1px #888 solid;
+}
+
+table.classTbl {
+  border-collapse: collapse;
+  border: 1px #888 solid;
+}
+
+/* only add a border to dicts if they're embedded within another object */
+td.listElt table.dictTbl,
+td.tupleElt table.dictTbl,
+td.dictVal table.dictTbl,
+td.instVal table.dictTbl,
+td.classVal table.dictTbl {
+  border: 1px #888 solid;
+}
+
+
+.typeLabel {
+  font-size: 8pt;
+  color: #222222;
+  margin-bottom: 1px;
+}
+
+#footer {
+  color: #666666;
+  font-size: 9pt;
+  border-top: 1px solid #bbbbbb;
+  padding-top: 5px;
+  margin-top: 5px;
+
+  max-width: 700px;
+  /* center align */
+  margin-left: auto;
+  margin-right: auto;
+}
+
+
+/* new stuff added for Online Python Tutor "2.0" release */
+
+div#stack, div#globals_area {
+  padding-left: 10px;
+  padding-right: 30px;
+
+  /* no longer necessary ... */
+  /*float: left;*/
+  /* border-right: 1px dashed #bbbbbb; */
+}
+
+div.stackFrame, div.zombieStackFrame {
+  background-color: #ffffff;
+  margin-bottom: 15px;
+  padding: 2px;
+  padding-left: 6px;
+  padding-right: 6px;
+  padding-bottom: 4px;
+  font-size: 10pt;
+}
+
+div.zombieStackFrame {
+  border-left: 1px dotted #aaa;
+  /*color: #c0c0c0;*/
+  color: #b0b0b0;
+}
+
+div.highlightedStackFrame {
+  background-color: #c5dfea;
+}
+
+div.stackFrame, div.highlightedStackFrame {
+  border-left: 2px solid #a6b3b6;
+}
+
+
+div.stackFrameHeader {
+  font-family: Andale mono, monospace;
+  font-size: 10pt;
+  margin-top: 4px;
+  margin-bottom: 3px;
+  white-space: nowrap;
+}
+
+td.stackFrameVar {
+  text-align: right;
+  padding-right: 8px;
+  padding-top: 3px;
+  padding-bottom: 3px;
+}
+
+td.stackFrameValue {
+  text-align: left;
+  border-bottom: 1px solid #aaaaaa;
+  border-left: 1px solid #aaaaaa;
+
+  padding-top: 3px;
+  padding-left: 3px;
+  padding-bottom: 3px;
+}
+
+.stackFrameVarTable tr {
+
+}
+
+.stackFrameVarTable {
+  text-align: right;
+  padding-top: 3px;
+
+  /* right-align the table */
+  margin-left: auto;
+  margin-right: 0px;
+}
+
+div#heap {
+  float: left;
+  padding-left: 30px;
+}
+
+td.toplevelHeapObject {
+  /* to make room for transition animations */
+  padding-left: 8px;
+  padding-right: 8px;
+  padding-top: 4px;
+  padding-bottom: 4px;
+  border: 2px dotted white;
+  border-color: white; /* needed for d3 to do transitions */
+}
+
+table.heapRow {
+  margin-bottom: 10px;
+}
+
+div.heapObject {
+  padding-left: 2px; /* leave a TINY amount of room for connector endpoints */
+}
+
+div#stackHeader {
+  margin-bottom: 15px;
+  text-align: right;
+}
+
+div#heapHeader {
+  /*margin-top: 2px;
+  margin-bottom: 13px;*/
+  margin-bottom: 15px;
+}
+
+div#stackHeader,
+div#heapHeader {
+  color: #333333;
+  font-size: 10pt;
+}
+
+#executionSlider {
+  width: 300px;
+  margin: 6px auto;
+}
+
+#executionSliderCaption {
+  font-size: 8pt;
+  color: #666666;
+  margin-top: 15px;
+}
+
+#executionSliderFooter {
+  margin-top: -7px; /* make it butt up against #executionSlider */
+}
+
+
+/* necessary for CodeMirror line highlighting to work! */
+.CodeMirror .errorLine { background: #F89D99 !important; }
+
+
+/* darken slider handle a bit */
+.ui-slider .ui-slider-handle {
+  border: 1px solid #999;
+}

From 6d636e97cfa22ecc2e64db845db0f4543eabe76e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 29 Aug 2012 18:14:56 -0700
Subject: [PATCH 174/502] refactored CSS to prevent style clashes: make each
 ExecutionVisualizer object contain its own div.ExecutionVisualizer, and
 prefix all CSS rules with div.ExecutionVisualizer

---
 .../css/2012-08-29-CSS-encapsulation/README   |   8 +
 PyTutorGAE/css/opt-frontend.css               |  28 +-
 PyTutorGAE/css/pytutor.css                    | 318 ++++++------------
 PyTutorGAE/js/pytutor.js                      |   8 +-
 4 files changed, 135 insertions(+), 227 deletions(-)

diff --git a/PyTutorGAE/css/2012-08-29-CSS-encapsulation/README b/PyTutorGAE/css/2012-08-29-CSS-encapsulation/README
index 870a0db74..9c8e790d0 100644
--- a/PyTutorGAE/css/2012-08-29-CSS-encapsulation/README
+++ b/PyTutorGAE/css/2012-08-29-CSS-encapsulation/README
@@ -44,3 +44,11 @@ I'm also wondering whether there could be unforeseen interactions with
 other classes that might have been prespecified on that div. I don't
 know what the downsides of the new approach are, though.
 
+---
+My thoughts:
+
+- maybe just have a set of css styles for a standalone visualizer, and
+  then add an option or something to flip a bit to make it embedded ...
+  if the visualizer is embedded, then use js to set css for certain
+  attributes
+
diff --git a/PyTutorGAE/css/opt-frontend.css b/PyTutorGAE/css/opt-frontend.css
index 7dcb24cbc..698fe4280 100644
--- a/PyTutorGAE/css/opt-frontend.css
+++ b/PyTutorGAE/css/opt-frontend.css
@@ -27,14 +27,8 @@ body {
   font-size: 10pt;
 }
 
-a {
-  color: #3D58A2;
-}
-
-a:visited {
-  color: #3D58A2;
-}
-
+a,
+a:visited,
 a:hover {
   color: #3D58A2;
 }
@@ -67,3 +61,21 @@ button.smallBtn {
   padding: 3px;
 }
 
+button.bigBtn {
+  font-size: 12pt;
+  padding: 5px;
+}
+
+#footer {
+  color: #666666;
+  font-size: 9pt;
+  border-top: 1px solid #bbbbbb;
+  padding-top: 5px;
+  margin-top: 5px;
+
+  max-width: 700px;
+  /* center align */
+  margin-left: auto;
+  margin-right: auto;
+}
+
diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index e5bfe4ccb..874653bd3 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -26,25 +26,29 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 */
 
-/* Most recent color scheme redesign: 2012-08-19 */
+/* Most recent color scheme redesign on 2012-08-19 */
 
-table.visualizer {
+/* To prevent CSS namespace clashes, prefix all rules with:
+     div.ExecutionVisualizer
+*/
+
+
+div.ExecutionVisualizer table.visualizer {
   font-family: verdana, arial, helvetica, sans-serif;
   font-size: 10pt;
 }
 
-
-td#stack_td,
-td#heap_td {
+div.ExecutionVisualizer td#stack_td,
+div.ExecutionVisualizer td#heap_td {
   vertical-align:top;
   font-size: 10pt; /* don't make fonts in the heap so big! */
 }
 
-#dataViz {
+div.ExecutionVisualizer #dataViz {
   margin-left: 30px;
 }
 
-table.frameDataViz {
+div.ExecutionVisualizer table.frameDataViz {
   border-spacing: 0px;
   font-size: 12pt;
   margin-top: 5px;
@@ -53,14 +57,14 @@ table.frameDataViz {
   padding: 5px;
 }
 
-table.frameDataViz td.varname {
+div.ExecutionVisualizer table.frameDataViz td.varname {
   text-align: right;
   padding: 5px;
   padding-right: 8px;
   border-right: 1px dashed #888888;
 }
 
-table.frameDataViz td.val {
+div.ExecutionVisualizer table.frameDataViz td.val {
   padding-left: 8px;
   padding-right: 5px;
 
@@ -68,7 +72,7 @@ table.frameDataViz td.val {
   padding-bottom: 8px;
 }
 
-div#pyCodeOutputDiv {
+div.ExecutionVisualizer div#pyCodeOutputDiv {
   max-width: 550px;
   max-height: 450px;
   /*max-height: 620px;*/
@@ -76,7 +80,7 @@ div#pyCodeOutputDiv {
   /*margin-bottom: 4px;*/
 }
 
-table#pyCodeOutput {
+div.ExecutionVisualizer table#pyCodeOutput {
   font-family: Andale mono, monospace;
   font-size:12pt;
   line-height:1.1em;
@@ -88,11 +92,11 @@ table#pyCodeOutput {
 }
 
 /* don't wrap lines within code output ... FORCE scrollbars to appear */
-table#pyCodeOutput td {
+div.ExecutionVisualizer table#pyCodeOutput td {
   white-space: nowrap;
 }
 
-table#pyCodeOutput .lineNo {
+div.ExecutionVisualizer table#pyCodeOutput .lineNo {
   background-color:#FFFFFF;
   color:#AAAAAA;
   margin:0;
@@ -102,25 +106,20 @@ table#pyCodeOutput .lineNo {
   width:2.1em;
 }
 
-table#pyCodeOutput .cod {
+div.ExecutionVisualizer table#pyCodeOutput .cod {
   /*font-weight: bold;*/
   margin-left: 3px;
   padding-left: 7px;
   text-align: left; /* necessary or else doesn't work properly in IE */
 }
 
-div#editCodeLinkDiv {
+div.ExecutionVisualizer div#editCodeLinkDiv {
   text-align: center;
   margin-top: 12px;
   margin-bottom: 4px;
 }
 
-#editCodeLinkOnError {
-  color: #142B69;
-}
-
-
-#errorOutput {
+div.ExecutionVisualizer #errorOutput {
   color: #d03939;
   /*background-color: #F87D76;*/
   font-size: 12pt;
@@ -129,30 +128,19 @@ div#editCodeLinkDiv {
   margin-bottom: 4px;
 }
 
-button.bigBtn {
-  font-size: 12pt;
-  padding: 5px;
-}
-
-button.medBtn {
-  font-size: 12pt;
-  padding: 3px;
-}
-
-
 /* VCR control buttons for stepping through execution */
 
-#vcrControls {
+div.ExecutionVisualizer #vcrControls {
   margin-top: 15px;
   margin-bottom: 15px;
 }
 
-#vcrControls button {
+div.ExecutionVisualizer #vcrControls button {
   margin-left: 5px;
   margin-right: 5px;
 }
 
-#pyStdout {
+div.ExecutionVisualizer #pyStdout {
   border: 1px solid #999999;
   font-size: 12pt;
   padding: 4px;
@@ -160,7 +148,7 @@ button.medBtn {
 }
 
 
-.vizFrame {
+div.ExecutionVisualizer .vizFrame {
   margin-bottom: 20px;
   padding-left: 8px;
   border-left: 2px solid #cccccc;
@@ -169,43 +157,37 @@ button.medBtn {
 
 /* Rendering of primitive types */
 
-.nullObj {
+div.ExecutionVisualizer .nullObj {
   font-size: 8pt;
 }
 
-/*
-.numberObj {
-  font-size: 10pt;
-}
-
-.boolObj {
-  font-size: 10pt;
-}
-*/
-
-.stringObj, .customObj, .funcObj {
+div.ExecutionVisualizer .stringObj,
+div.ExecutionVisualizer .customObj,
+div.ExecutionVisualizer .funcObj {
   font-family: Andale mono, monospace;
 }
 
-.retval {
+div.ExecutionVisualizer .retval {
   font-size: 9pt;
 }
 
 
 /* Rendering of basic compound types */
 
-table.listTbl, table.tupleTbl, table.setTbl {
+div.ExecutionVisualizer table.listTbl,
+div.ExecutionVisualizer table.tupleTbl,
+div.ExecutionVisualizer table.setTbl {
   background-color: #ffffc6;
 }
 
 
-table.listTbl {
+div.ExecutionVisualizer table.listTbl {
   border: 0px solid black;
   border-spacing: 0px;
 }
 
-table.listTbl td.listHeader,
-table.tupleTbl td.tupleHeader {
+div.ExecutionVisualizer table.listTbl td.listHeader,
+div.ExecutionVisualizer table.tupleTbl td.tupleHeader {
   padding-left: 4px;
   padding-top: 2px;
   padding-bottom: 3px;
@@ -215,7 +197,7 @@ table.tupleTbl td.tupleHeader {
   border-left: 1px solid #555555;
 }
 
-table.tupleTbl {
+div.ExecutionVisualizer table.tupleTbl {
   border-spacing: 0px;
   color: black;
 
@@ -225,27 +207,27 @@ table.tupleTbl {
 }
 
 
-table.listTbl td.listElt {
+div.ExecutionVisualizer table.listTbl td.listElt {
   border-bottom: 1px solid #555555; /* must match td.listHeader border */
   border-left: 1px solid #555555; /* must match td.listHeader border */
 }
 
-table.tupleTbl td.tupleElt {
+div.ExecutionVisualizer table.tupleTbl td.tupleElt {
   border-left: 1px solid #555555; /* must match td.tupleHeader border */
 }
 
-table.customObjTbl {
+div.ExecutionVisualizer table.customObjTbl {
   background-color: white;
   color: black;
   border: 1px solid black;
 }
 
-table.customObjTbl td.customObjElt {
+div.ExecutionVisualizer table.customObjTbl td.customObjElt {
   padding: 5px;
 }
 
-table.listTbl td.listElt,
-table.tupleTbl td.tupleElt {
+div.ExecutionVisualizer table.listTbl td.listElt,
+div.ExecutionVisualizer table.tupleTbl td.tupleElt {
   padding-top: 0px;
   padding-bottom: 8px;
   padding-left: 10px;
@@ -253,39 +235,39 @@ table.tupleTbl td.tupleElt {
   vertical-align: bottom;
 }
 
-table.setTbl {
+div.ExecutionVisualizer table.setTbl {
   border: 1px solid #555555;
   border-spacing: 0px;
   text-align: center;
 }
 
-table.setTbl td.setElt {
+div.ExecutionVisualizer table.setTbl td.setElt {
   padding: 8px;
 }
 
 
-table.dictTbl,
-table.instTbl,
-table.classTbl {
+div.ExecutionVisualizer table.dictTbl,
+div.ExecutionVisualizer table.instTbl,
+div.ExecutionVisualizer table.classTbl {
   border-spacing: 1px;
 }
 
-table.dictTbl td.dictKey,
-table.instTbl td.instKey,
-table.classTbl td.classKey {
+div.ExecutionVisualizer table.dictTbl td.dictKey,
+div.ExecutionVisualizer table.instTbl td.instKey,
+div.ExecutionVisualizer table.classTbl td.classKey {
   background-color: #faebbf;
 }
 
-table.dictTbl td.dictVal,
-table.instTbl td.instVal,
-table.classTbl td.classVal {
+div.ExecutionVisualizer table.dictTbl td.dictVal,
+div.ExecutionVisualizer table.instTbl td.instVal,
+div.ExecutionVisualizer table.classTbl td.classVal {
   background-color: #ffffc6;
 }
 
 
-table.dictTbl td.dictKey,
-table.instTbl td.instKey,
-table.classTbl td.classKey {
+div.ExecutionVisualizer table.dictTbl td.dictKey,
+div.ExecutionVisualizer table.instTbl td.instKey,
+div.ExecutionVisualizer table.classTbl td.classKey {
   padding-top: 12px /*15px*/;
   padding-bottom: 5px;
   padding-left: 10px;
@@ -294,9 +276,9 @@ table.classTbl td.classKey {
   text-align: right;
 }
 
-table.dictTbl td.dictVal,
-table.instTbl td.instVal,
-table.classTbl td.classVal {
+div.ExecutionVisualizer table.dictTbl td.dictVal,
+div.ExecutionVisualizer table.instTbl td.instVal,
+div.ExecutionVisualizer table.classTbl td.classVal {
   padding-top: 12px /*15px*/;
   padding-bottom: 5px;
   padding-right: 10px;
@@ -304,54 +286,39 @@ table.classTbl td.classVal {
 }
 
 
-table.classTbl td,
-table.instTbl td {
+div.ExecutionVisualizer table.classTbl td,
+div.ExecutionVisualizer table.instTbl td {
   border-bottom: 1px #888 solid;
 }
 
-table.classTbl td.classVal,
-table.instTbl td.instVal {
+div.ExecutionVisualizer table.classTbl td.classVal,
+div.ExecutionVisualizer table.instTbl td.instVal {
   border-left: 1px #888 solid;
 }
 
-table.classTbl {
+div.ExecutionVisualizer table.classTbl {
   border-collapse: collapse;
   border: 1px #888 solid;
 }
 
 /* only add a border to dicts if they're embedded within another object */
-td.listElt table.dictTbl,
-td.tupleElt table.dictTbl,
-td.dictVal table.dictTbl,
-td.instVal table.dictTbl,
-td.classVal table.dictTbl {
+div.ExecutionVisualizer td.listElt table.dictTbl,
+div.ExecutionVisualizer td.tupleElt table.dictTbl,
+div.ExecutionVisualizer td.dictVal table.dictTbl,
+div.ExecutionVisualizer td.instVal table.dictTbl,
+div.ExecutionVisualizer td.classVal table.dictTbl {
   border: 1px #888 solid;
 }
 
 
-.typeLabel {
+div.ExecutionVisualizer .typeLabel {
   font-size: 8pt;
   color: #222222;
   margin-bottom: 1px;
 }
 
-#footer {
-  color: #666666;
-  font-size: 9pt;
-  border-top: 1px solid #bbbbbb;
-  padding-top: 5px;
-  margin-top: 5px;
-
-  max-width: 700px;
-  /* center align */
-  margin-left: auto;
-  margin-right: auto;
-}
-
-
-/* new stuff added for Online Python Tutor "2.0" release */
-
-div#stack, div#globals_area {
+div.ExecutionVisualizer div#stack,
+div.ExecutionVisualizer div#globals_area {
   padding-left: 10px;
   padding-right: 30px;
 
@@ -360,7 +327,8 @@ div#stack, div#globals_area {
   /* border-right: 1px dashed #bbbbbb; */
 }
 
-div.stackFrame, div.zombieStackFrame {
+div.ExecutionVisualizer div.stackFrame,
+div.ExecutionVisualizer div.zombieStackFrame {
   background-color: #ffffff;
   margin-bottom: 15px;
   padding: 2px;
@@ -370,36 +338,37 @@ div.stackFrame, div.zombieStackFrame {
   font-size: 10pt;
 }
 
-div.zombieStackFrame {
+div.ExecutionVisualizer div.zombieStackFrame {
   border-left: 1px dotted #aaa;
   /*color: #c0c0c0;*/
   color: #b0b0b0;
 }
 
-div.highlightedStackFrame {
+div.ExecutionVisualizer div.highlightedStackFrame {
   background-color: #c5dfea;
 }
 
-div.stackFrame, div.highlightedStackFrame {
+div.ExecutionVisualizer div.stackFrame,
+div.ExecutionVisualizer div.highlightedStackFrame {
   border-left: 2px solid #a6b3b6;
 }
 
 
-div.stackFrameHeader {
+div.ExecutionVisualizer div.stackFrameHeader {
   font-family: Andale mono, monospace;
   font-size: 10pt;
   margin-top: 4px;
   margin-bottom: 3px;
 }
 
-td.stackFrameVar {
+div.ExecutionVisualizer td.stackFrameVar {
   text-align: right;
   padding-right: 8px;
   padding-top: 3px;
   padding-bottom: 3px;
 }
 
-td.stackFrameValue {
+div.ExecutionVisualizer td.stackFrameValue {
   text-align: left;
   border-bottom: 1px solid #aaaaaa;
   border-left: 1px solid #aaaaaa;
@@ -409,11 +378,11 @@ td.stackFrameValue {
   padding-bottom: 3px;
 }
 
-.stackFrameVarTable tr {
+div.ExecutionVisualizer .stackFrameVarTable tr {
 
 }
 
-.stackFrameVarTable {
+div.ExecutionVisualizer .stackFrameVarTable {
   text-align: right;
   padding-top: 3px;
 
@@ -422,12 +391,12 @@ td.stackFrameValue {
   margin-right: 0px;
 }
 
-div#heap {
+div.ExecutionVisualizer div#heap {
   float: left;
   padding-left: 30px;
 }
 
-td.toplevelHeapObject {
+div.ExecutionVisualizer td.toplevelHeapObject {
   /* to make room for transition animations */
   padding-left: 8px;
   padding-right: 8px;
@@ -437,141 +406,54 @@ td.toplevelHeapObject {
   border-color: white; /* needed for d3 to do transitions */
 }
 
-table.heapRow {
+div.ExecutionVisualizer table.heapRow {
   margin-bottom: 10px;
 }
 
-div.heapObject {
+div.ExecutionVisualizer div.heapObject {
   padding-left: 2px; /* leave a TINY amount of room for connector endpoints */
 }
 
-div#stackHeader {
+div.ExecutionVisualizer div#stackHeader {
   margin-bottom: 15px;
   text-align: right;
 }
 
-div#heapHeader {
+div.ExecutionVisualizer div#heapHeader {
   /*margin-top: 2px;
   margin-bottom: 13px;*/
   margin-bottom: 15px;
 }
 
-div#stackHeader,
-div#heapHeader {
+div.ExecutionVisualizer div#stackHeader,
+div.ExecutionVisualizer div#heapHeader {
   color: #333333;
   font-size: 10pt;
 }
 
-
-/* styles for Online Python Tutor questions site */
-
-#questionsHeaderPane {
-  text-align: left;
-  margin-bottom: 15px;
-  width: 650px;
-  border-bottom: 1px solid #bbbbbb;
-}
-
-.questionsHeaderStmt {
-  margin-bottom: 5px;
-}
-
-.questionsHeaderTitle {
-  margin-bottom: 5px;
-  font-weight: bold;
-  font-size: 12pt;
-}
-
-#submittedCodeRO {
-  font-size: 10pt;
-  font-family: Andale mono, monospace;
-  padding: 4px;
-  margin-top: 5px;
-}
-
-table#gradeMatrix {
-  margin-top: 12px;
-}
-
-table#gradeMatrix thead {
-  font-weight: bold;
-  border: solid;
-}
-
-table#gradeMatrix thead td.statusCell {
-  padding-left: 18px; /* to line up with smiley faces */
-}
-
-table#gradeMatrix td.testInputCell,
-table#gradeMatrix td.testOutputCell {
-  padding-right: 25px;
-  padding-bottom: 10px;
-  vertical-align: middle;
-}
-
-table#gradeMatrix tbody td.statusCell,
-table#gradeMatrix tbody td.expectedCell {
-  padding-left: 12px;
-  padding-bottom: 10px;
-  vertical-align: middle;
-}
- 
-td.testInputVarnameCell,
-td.testOutputVarnameCell {
-  padding-right: 2px;
-  text-align: right;
-}
-
-td.testInputValCell,
-td.testOutputValCell {
-  padding-right: 5px;
-}
-
-pre#submittedCodePRE {
-  font-size: 10pt;
-  font-family: Andale mono, monospace;
-  background-color: #dddddd;
-  padding: 5px;
-}
-
-div#submittedSolutionDisplay {
-  width: 650px; /* to line up with questionsHeaderPane */
-  text-align: left;
-  font-size: 12pt;
-  margin-bottom: 20px;
-}
-
-#gradeSummary {
-  margin-top: 12px;
-}
-
-#pyGradingPane {
-  margin-bottom: 20px;
-}
-
-
-#executionSlider {
+div.ExecutionVisualizer #executionSlider {
   width: 500px;
   margin-top: 10px;
   margin-bottom: 5px;
 }
 
-#executionSliderCaption {
+div.ExecutionVisualizer #executionSliderCaption {
   font-size: 8pt;
   color: #666666;
   margin-top: 15px;
 }
 
-#executionSliderFooter {
+div.ExecutionVisualizer #executionSliderFooter {
   margin-top: -7px; /* make it butt up against #executionSlider */
 }
 
 
-/* necessary for CodeMirror line highlighting to work! */
-.CodeMirror .errorLine { background: #F89D99 !important; }
-
-
 /* darken slider handle a bit */
-.ui-slider .ui-slider-handle {
+div.ExecutionVisualizer .ui-slider .ui-slider-handle {
   border: 1px solid #999;
 }
+
+
+/* necessary for CodeMirror line highlighting to work! */
+div.ExecutionVisualizer .CodeMirror .errorLine { background: #F89D99 !important; }
+
diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 249848892..850653c35 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -97,9 +97,15 @@ function ExecutionVisualizer(domRootID, dat, params) {
 
 
   this.domRoot = $('#' + domRootID);
-
   this.domRootD3 = d3.select('#' + domRootID);
 
+  // stick a new div.ExecutionVisualizer within domRoot and make that
+  // the new domRoot:
+  this.domRoot.html('
');
+
+  this.domRoot = this.domRoot.find('div.ExecutionVisualizer');
+  this.domRootD3 = this.domRootD3.select('div.ExecutionVisualizer');
+
   this.keyStuckDown = false;
 
 

From 8b6a043e8ddf3ac3dccf03a62e765ebf028131a5 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 29 Aug 2012 18:39:25 -0700
Subject: [PATCH 175/502] incorporated some style tweaks from john

---
 PyTutorGAE/css/pytutor.css | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/PyTutorGAE/css/pytutor.css b/PyTutorGAE/css/pytutor.css
index 874653bd3..f4ff9715c 100644
--- a/PyTutorGAE/css/pytutor.css
+++ b/PyTutorGAE/css/pytutor.css
@@ -88,7 +88,8 @@ div.ExecutionVisualizer table#pyCodeOutput {
   border-top: 1px solid #999999;
   padding-top: 3px;
   border-bottom: 1px solid #999999;
-  margin-top: 6px;
+  /*margin-top: 6px;*/
+  margin: 6px auto; /* Center code in its pane */
 }
 
 /* don't wrap lines within code output ... FORCE scrollbars to appear */
@@ -115,8 +116,11 @@ div.ExecutionVisualizer table#pyCodeOutput .cod {
 
 div.ExecutionVisualizer div#editCodeLinkDiv {
   text-align: center;
+  /*
   margin-top: 12px;
   margin-bottom: 4px;
+  */
+  margin: 12px auto;
 }
 
 div.ExecutionVisualizer #errorOutput {
@@ -131,8 +135,13 @@ div.ExecutionVisualizer #errorOutput {
 /* VCR control buttons for stepping through execution */
 
 div.ExecutionVisualizer #vcrControls {
+  /*
   margin-top: 15px;
   margin-bottom: 15px;
+  */
+  margin: 15px auto;
+  width: 100%;
+  text-align: center;
 }
 
 div.ExecutionVisualizer #vcrControls button {
@@ -165,6 +174,7 @@ div.ExecutionVisualizer .stringObj,
 div.ExecutionVisualizer .customObj,
 div.ExecutionVisualizer .funcObj {
   font-family: Andale mono, monospace;
+  white-space: nowrap;
 }
 
 div.ExecutionVisualizer .retval {
@@ -359,6 +369,7 @@ div.ExecutionVisualizer div.stackFrameHeader {
   font-size: 10pt;
   margin-top: 4px;
   margin-bottom: 3px;
+  white-space: nowrap;
 }
 
 div.ExecutionVisualizer td.stackFrameVar {

From fafe494e09882d5bc88f95b7344e057e80bebb52 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 29 Aug 2012 18:46:26 -0700
Subject: [PATCH 176/502] bam

---
 .../css/2012-08-29-CSS-encapsulation/README       | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/PyTutorGAE/css/2012-08-29-CSS-encapsulation/README b/PyTutorGAE/css/2012-08-29-CSS-encapsulation/README
index 9c8e790d0..8d02a04dd 100644
--- a/PyTutorGAE/css/2012-08-29-CSS-encapsulation/README
+++ b/PyTutorGAE/css/2012-08-29-CSS-encapsulation/README
@@ -52,3 +52,18 @@ My thoughts:
   if the visualizer is embedded, then use js to set css for certain
   attributes
 
+---
+2012-08-29 email from me to John and Sean:
+
+Gentlemen -
+
+I just pushed some changes that implemented:
+
+- Sean's suggestion of creating a div.ExecutionVisualizer within the root DOM node passed into a new ExecutionVisualizer object,
+- prefixing of all CSS rules by div.ExecutionVisualizer
+- some of John's modified CSS
+
+Hopefully CSS clashes are less of a problem from now on.
+
+However, I still didn't implement John's suggestion for an "embedded CSS mode" yet; right now the best thing to do is to either tweak the CSS manually or to write javascript to dynamically modify the CSS.
+

From 991ac15033ac0244b500d393e4d4e68ad30a6c5f Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 30 Aug 2012 23:31:15 -0700
Subject: [PATCH 177/502] render horizontal bar below highlighted line for
 "return" events

---
 PyTutorGAE/js/pytutor.js | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/PyTutorGAE/js/pytutor.js b/PyTutorGAE/js/pytutor.js
index 850653c35..80a5e5fce 100644
--- a/PyTutorGAE/js/pytutor.js
+++ b/PyTutorGAE/js/pytutor.js
@@ -805,13 +805,23 @@ ExecutionVisualizer.prototype.updateOutput = function() {
         return d.backgroundColor;
       })
       .style('border-top', function(d) {
-        if ((d.lineNumber == curEntry.line) && !hasError && !isTerminated) {
+        if ((d.lineNumber == curEntry.line) &&
+            (curEntry.event != 'return') &&
+            !hasError && !isTerminated) {
           return '1px solid ' + highlightedLineTopBorderColor;
         }
         else {
           // put a default white top border to keep space usage consistent
           return '1px solid #ffffff';
         }
+      })
+      .style('border-bottom', function(d) {
+        // special case to render horizontal bar *BELOW* the highlighted line
+        if ((d.lineNumber == curEntry.line) &&
+            (curEntry.event == 'return') &&
+            !hasError && !isTerminated) {
+          return '1px solid ' + highlightedLineTopBorderColor;
+        }
       });
 
 

From dc974e61e49d8723f4d6a26bed85f86ec3209af5 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 31 Aug 2012 13:09:17 -0700
Subject: [PATCH 178/502] added decorator test

---
 PyTutorGAE/js/opt-frontend.js  |    6 +
 PyTutorGAE/tutor.html          |    3 +-
 example-code/decorators.golden | 1892 ++++++++++++++++++++++++++++++++
 example-code/decorators.txt    |   12 +
 4 files changed, 1912 insertions(+), 1 deletion(-)
 create mode 100644 example-code/decorators.golden
 create mode 100644 example-code/decorators.txt

diff --git a/PyTutorGAE/js/opt-frontend.js b/PyTutorGAE/js/opt-frontend.js
index 21075179d..f755c8fed 100644
--- a/PyTutorGAE/js/opt-frontend.js
+++ b/PyTutorGAE/js/opt-frontend.js
@@ -302,6 +302,12 @@ $(document).ready(function() {
     return false;
   });
 
+  $("#decoratorsLink").click(function() {
+    $.get("example-code/decorators.txt", setCodeMirrorVal);
+    return false;
+  });
+
+
 
   $('#closure1Link').click(function() {
     $.get("example-code/closures/closure1.txt", setCodeMirrorVal);
diff --git a/PyTutorGAE/tutor.html b/PyTutorGAE/tutor.html
index 920741ad4..bc58f4853 100644
--- a/PyTutorGAE/tutor.html
+++ b/PyTutorGAE/tutor.html
@@ -89,7 +89,8 @@
 sumList |
 towers of hanoi |
 exceptions |
-sum cubes
+sum cubes |
+decorators
 
 

 
diff --git a/example-code/decorators.golden b/example-code/decorators.golden
new file mode 100644
index 000000000..8b88ef0b2
--- /dev/null
+++ b/example-code/decorators.golden
@@ -0,0 +1,1892 @@
+{
+  "code": "def make_bold(fn):\n  return lambda : \"\" + fn() + \"\"\n\ndef make_italic(fn):\n  return lambda : \"\" + fn() + \"\"\n\n@make_bold\n@make_italic\ndef hello():\n  return \"hello world\"\n  \nhelloHTML = hello()\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "make_bold"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "make_bold": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "make_bold(fn)", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "make_bold", 
+        "make_italic"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "make_bold": [
+          "REF", 
+          1
+        ], 
+        "make_italic": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "make_bold(fn)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "make_italic(fn)", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "make_bold", 
+        "make_italic"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "make_bold": [
+          "REF", 
+          1
+        ], 
+        "make_italic": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "make_bold(fn)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "make_italic(fn)", 
+          null
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "make_bold", 
+        "make_italic"
+      ], 
+      "stdout": "", 
+      "func_name": "make_italic", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "fn": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "make_italic", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "make_italic_f1", 
+          "ordered_varnames": [
+            "fn"
+          ]
+        }
+      ], 
+      "globals": {
+        "make_bold": [
+          "REF", 
+          1
+        ], 
+        "make_italic": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "make_bold(fn)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "make_italic(fn)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "hello()", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "make_bold", 
+        "make_italic"
+      ], 
+      "stdout": "", 
+      "func_name": "make_italic", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "fn": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "make_italic", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "make_italic_f1", 
+          "ordered_varnames": [
+            "fn"
+          ]
+        }
+      ], 
+      "globals": {
+        "make_bold": [
+          "REF", 
+          1
+        ], 
+        "make_italic": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "make_bold(fn)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "make_italic(fn)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "hello()", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "make_bold", 
+        "make_italic"
+      ], 
+      "stdout": "", 
+      "func_name": "make_italic", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
+            "fn": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "make_italic", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "make_italic_f1_p", 
+          "ordered_varnames": [
+            "fn", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "make_bold": [
+          "REF", 
+          1
+        ], 
+        "make_italic": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "make_bold(fn)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "make_italic(fn)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "hello()", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "()", 
+          1
+        ]
+      }, 
+      "line": 5, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "make_bold", 
+        "make_italic"
+      ], 
+      "stdout": "", 
+      "func_name": "make_bold", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
+            "fn": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "make_italic", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "make_italic_f1_p_z", 
+          "ordered_varnames": [
+            "fn", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "fn": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "make_bold", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "make_bold_f2", 
+          "ordered_varnames": [
+            "fn"
+          ]
+        }
+      ], 
+      "globals": {
+        "make_bold": [
+          "REF", 
+          1
+        ], 
+        "make_italic": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "make_bold(fn)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "make_italic(fn)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "hello()", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "()", 
+          1
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "make_bold", 
+        "make_italic"
+      ], 
+      "stdout": "", 
+      "func_name": "make_bold", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
+            "fn": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "make_italic", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "make_italic_f1_p_z", 
+          "ordered_varnames": [
+            "fn", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "fn": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "make_bold", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "make_bold_f2", 
+          "ordered_varnames": [
+            "fn"
+          ]
+        }
+      ], 
+      "globals": {
+        "make_bold": [
+          "REF", 
+          1
+        ], 
+        "make_italic": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "make_bold(fn)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "make_italic(fn)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "hello()", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "()", 
+          1
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "make_bold", 
+        "make_italic"
+      ], 
+      "stdout": "", 
+      "func_name": "make_bold", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
+            "fn": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "make_italic", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "make_italic_f1_p_z", 
+          "ordered_varnames": [
+            "fn", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
+            "fn": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "make_bold", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "make_bold_f2_p", 
+          "ordered_varnames": [
+            "fn", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "make_bold": [
+          "REF", 
+          1
+        ], 
+        "make_italic": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "make_bold(fn)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "make_italic(fn)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "hello()", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "()", 
+          1
+        ], 
+        "5": [
+          "FUNCTION", 
+          "()", 
+          2
+        ]
+      }, 
+      "line": 2, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "make_bold", 
+        "make_italic", 
+        "hello"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
+            "fn": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "make_italic", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "make_italic_f1_p_z", 
+          "ordered_varnames": [
+            "fn", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
+            "fn": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "make_bold", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "make_bold_f2_p_z", 
+          "ordered_varnames": [
+            "fn", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "make_bold": [
+          "REF", 
+          1
+        ], 
+        "make_italic": [
+          "REF", 
+          2
+        ], 
+        "hello": [
+          "REF", 
+          5
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "make_bold(fn)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "make_italic(fn)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "hello()", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "()", 
+          1
+        ], 
+        "5": [
+          "FUNCTION", 
+          "()", 
+          2
+        ]
+      }, 
+      "line": 12, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "make_bold", 
+        "make_italic", 
+        "hello"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
+            "fn": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "make_italic", 
+          "is_zombie": true, 
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+          "make_bold(fn)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "make_italic(fn)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "hello()", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "()", 
+          1
+        ], 
+        "5": [
+          "FUNCTION", 
+          "()", 
+          2
+        ]
+      }, 
+      "line": 5, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "make_bold", 
+        "make_italic", 
+        "hello"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
+            "fn": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "make_italic", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "make_italic_f1_p_z", 
+          "ordered_varnames": [
+            "fn", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
+            "fn": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "make_bold", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "make_bold_f2_p_z", 
+          "ordered_varnames": [
+            "fn", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "__return__": "hello world"
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            2
+          ], 
+          "unique_hash": "_f3", 
+          "ordered_varnames": [
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "make_bold": [
+          "REF", 
+          1
+        ], 
+        "make_italic": [
+          "REF", 
+          2
+        ], 
+        "hello": [
+          "REF", 
+          5
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "make_bold(fn)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "make_italic(fn)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "hello()", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "()", 
+          1
+        ], 
+        "5": [
+          "FUNCTION", 
+          "()", 
+          2
+        ]
+      }, 
+      "line": 2, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "make_bold", 
+        "make_italic", 
+        "hello", 
+        "helloHTML"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
+            "fn": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "make_italic", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "make_italic_f1_p_z", 
+          "ordered_varnames": [
+            "fn", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
+            "fn": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "make_bold", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "make_bold_f2_p_z", 
+          "ordered_varnames": [
+            "fn", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "make_bold": [
+          "REF", 
+          1
+        ], 
+        "make_italic": [
+          "REF", 
+          2
+        ], 
+        "hello": [
+          "REF", 
+          5
+        ], 
+        "helloHTML": "hello world"
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "make_bold(fn)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "make_italic(fn)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "hello()", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "()", 
+          1
+        ], 
+        "5": [
+          "FUNCTION", 
+          "()", 
+          2
+        ]
+      }, 
+      "line": 12, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/example-code/decorators.txt b/example-code/decorators.txt
new file mode 100644
index 000000000..b73b335f8
--- /dev/null
+++ b/example-code/decorators.txt
@@ -0,0 +1,12 @@
+def make_bold(fn):
+  return lambda : "" + fn() + ""
+
+def make_italic(fn):
+  return lambda : "" + fn() + ""
+
+@make_bold
+@make_italic
+def hello():
+  return "hello world"
+  
+helloHTML = hello()

From 174b783a555ff630aa0a82b5c55e024f44c7501e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 1 Sep 2012 10:38:08 -0700
Subject: [PATCH 179/502] renamed PyTutorGAE/ to v3/

---
 {PyTutorGAE => v3}/README                           |   0
 {PyTutorGAE => v3}/app.yaml                         |   0
 {PyTutorGAE => v3}/convert_2to3.py                  |   0
 {PyTutorGAE => v3}/create_log_db.py                 |   0
 .../css/2012-08-29-CSS-encapsulation/README         |   0
 .../papajohn-pytutor.css                            |   0
 {PyTutorGAE => v3}/css/codemirror.css               |   0
 {PyTutorGAE => v3}/css/opt-frontend.css             |   0
 {PyTutorGAE => v3}/css/pytutor.css                  |   0
 .../css/smoothness/jquery-ui-1.8.21.custom.css      |   0
 .../ui-bg_diagonals-thick_18_b81900_40x40.png       | Bin
 .../ui-bg_diagonals-thick_20_666666_40x40.png       | Bin
 .../images/ui-bg_flat_10_000000_40x100.png          | Bin
 .../images/ui-bg_glass_100_f6f6f6_1x400.png         | Bin
 .../images/ui-bg_glass_100_fdf5ce_1x400.png         | Bin
 .../images/ui-bg_glass_65_ffffff_1x400.png          | Bin
 .../images/ui-bg_gloss-wave_35_f6a828_500x100.png   | Bin
 .../ui-bg_highlight-soft_100_eeeeee_1x100.png       | Bin
 .../images/ui-bg_highlight-soft_75_ffe45c_1x100.png | Bin
 .../ui-lightness/images/ui-icons_222222_256x240.png | Bin
 .../ui-lightness/images/ui-icons_228ef1_256x240.png | Bin
 .../ui-lightness/images/ui-icons_ef8c08_256x240.png | Bin
 .../ui-lightness/images/ui-icons_ffd27a_256x240.png | Bin
 .../ui-lightness/images/ui-icons_ffffff_256x240.png | Bin
 .../css/ui-lightness/jquery-ui-1.8.21.custom.css    |   0
 {PyTutorGAE => v3}/embedding-examples.js            |   0
 {PyTutorGAE => v3}/embedding-test.html              |   0
 {PyTutorGAE => v3}/example-code                     |   0
 {PyTutorGAE => v3}/generate_json_trace.py           |   0
 {PyTutorGAE => v3}/js/codemirror/codemirror.js      |   0
 {PyTutorGAE => v3}/js/codemirror/python.js          |   0
 {PyTutorGAE => v3}/js/d3.v2.min.js                  |   0
 {PyTutorGAE => v3}/js/jquery-1.6.min.js             |   0
 .../js/jquery-ui-1.8.21.custom.min.js               |   0
 {PyTutorGAE => v3}/js/jquery.ba-bbq.min.js          |   0
 .../js/jquery.jsPlumb-1.3.10-all-min.js             |   0
 {PyTutorGAE => v3}/js/opt-frontend.js               |   0
 {PyTutorGAE => v3}/js/pytutor.js                    |   0
 {PyTutorGAE => v3}/logger/gae_logger.py             |   0
 {PyTutorGAE => v3}/pg_encoder.py                    |   0
 {PyTutorGAE => v3}/pg_logger.py                     |   0
 {PyTutorGAE => v3}/pythontutor.py                   |   0
 .../tests/backend-tests/caught_exception_1.golden   |   0
 .../tests/backend-tests/caught_exception_1.txt      |   0
 .../tests/backend-tests/caught_exception_2.golden   |   0
 .../tests/backend-tests/caught_exception_2.txt      |   0
 .../tests/backend-tests/circ_ref.golden             |   0
 {PyTutorGAE => v3}/tests/backend-tests/circ_ref.txt |   0
 .../tests/backend-tests/circ_ref_2.golden           |   0
 .../tests/backend-tests/circ_ref_2.txt              |   0
 .../tests/backend-tests/circ_ref_fake.golden        |   0
 .../tests/backend-tests/circ_ref_fake.txt           |   0
 .../tests/backend-tests/class_test.golden           |   0
 .../tests/backend-tests/class_test.txt              |   0
 .../tests/backend-tests/class_test_2.golden         |   0
 .../tests/backend-tests/class_test_2.txt            |   0
 .../tests/backend-tests/class_test_3.golden         |   0
 .../tests/backend-tests/class_test_3.txt            |   0
 .../tests/backend-tests/data_test.golden            |   0
 .../tests/backend-tests/data_test.txt               |   0
 .../tests/backend-tests/dict_error.golden           |   0
 .../tests/backend-tests/dict_error.txt              |   0
 .../tests/backend-tests/dict_test.golden            |   0
 .../tests/backend-tests/dict_test.txt               |   0
 .../tests/backend-tests/exec_test.golden            |   0
 .../tests/backend-tests/exec_test.txt               |   0
 .../tests/backend-tests/func_exception.golden       |   0
 .../tests/backend-tests/func_exception.txt          |   0
 .../tests/backend-tests/generator_test.golden       |   0
 .../tests/backend-tests/generator_test.txt          |   0
 .../tests/backend-tests/import_error.golden         |   0
 .../tests/backend-tests/import_error.txt            |   0
 .../tests/backend-tests/infinite_loop.golden        |   0
 .../tests/backend-tests/infinite_loop.txt           |   0
 .../backend-tests/infinite_loop_one_liner.golden    |   0
 .../tests/backend-tests/infinite_loop_one_liner.txt |   0
 .../tests/backend-tests/john-compose.golden         |   0
 .../tests/backend-tests/john-compose.txt            |   0
 .../tests/backend-tests/john-import-test.golden     |   0
 .../tests/backend-tests/john-import-test.txt        |   0
 .../tests/backend-tests/lambda_1.golden             |   0
 {PyTutorGAE => v3}/tests/backend-tests/lambda_1.txt |   0
 .../tests/backend-tests/ling-scheme-1.golden        |   0
 .../tests/backend-tests/ling-scheme-1.txt           |   0
 .../tests/backend-tests/ling-scheme-2.golden        |   0
 .../tests/backend-tests/ling-scheme-2.txt           |   0
 .../tests/backend-tests/ling-scheme-3.golden        |   0
 .../tests/backend-tests/ling-scheme-3.txt           |   0
 .../tests/backend-tests/list_dict_test.golden       |   0
 .../tests/backend-tests/list_dict_test.txt          |   0
 .../tests/backend-tests/list_test.golden            |   0
 .../tests/backend-tests/list_test.txt               |   0
 .../tests/backend-tests/newstyle_class.golden       |   0
 .../tests/backend-tests/newstyle_class.txt          |   0
 .../tests/backend-tests/one_func.golden             |   0
 {PyTutorGAE => v3}/tests/backend-tests/one_func.txt |   0
 .../tests/backend-tests/open_error.golden           |   0
 .../tests/backend-tests/open_error.txt              |   0
 .../tests/backend-tests/parse_error.golden          |   0
 .../tests/backend-tests/parse_error.txt             |   0
 .../tests/backend-tests/parse_error_2.golden        |   0
 .../tests/backend-tests/parse_error_2.txt           |   0
 .../tests/backend-tests/parse_error_3.golden        |   0
 .../tests/backend-tests/parse_error_3.txt           |   0
 .../tests/backend-tests/pie-test.golden             |   0
 {PyTutorGAE => v3}/tests/backend-tests/pie-test.txt |   0
 .../tests/backend-tests/print_builtins_error.golden |   0
 .../tests/backend-tests/print_builtins_error.txt    |   0
 .../tests/backend-tests/runtime_error.golden        |   0
 .../tests/backend-tests/runtime_error.txt           |   0
 .../tests/backend-tests/set_test.golden             |   0
 {PyTutorGAE => v3}/tests/backend-tests/set_test.txt |   0
 .../tests/backend-tests/simple.golden               |   0
 {PyTutorGAE => v3}/tests/backend-tests/simple.txt   |   0
 .../tests/backend-tests/three_lists.golden          |   0
 .../tests/backend-tests/three_lists.txt             |   0
 .../tests/backend-tests/tuple_test.golden           |   0
 .../tests/backend-tests/tuple_test.txt              |   0
 .../tests/backend-tests/two_funcs.golden            |   0
 .../tests/backend-tests/two_funcs.txt               |   0
 {PyTutorGAE => v3}/tests/example-code               |   0
 {PyTutorGAE => v3}/tests/golden_test.py             |   0
 {PyTutorGAE => v3}/tutor.html                       |   0
 {PyTutorGAE => v3}/web_exec.py                      |   0
 124 files changed, 0 insertions(+), 0 deletions(-)
 rename {PyTutorGAE => v3}/README (100%)
 rename {PyTutorGAE => v3}/app.yaml (100%)
 rename {PyTutorGAE => v3}/convert_2to3.py (100%)
 rename {PyTutorGAE => v3}/create_log_db.py (100%)
 rename {PyTutorGAE => v3}/css/2012-08-29-CSS-encapsulation/README (100%)
 rename {PyTutorGAE => v3}/css/2012-08-29-CSS-encapsulation/papajohn-pytutor.css (100%)
 rename {PyTutorGAE => v3}/css/codemirror.css (100%)
 rename {PyTutorGAE => v3}/css/opt-frontend.css (100%)
 rename {PyTutorGAE => v3}/css/pytutor.css (100%)
 rename {PyTutorGAE => v3}/css/smoothness/jquery-ui-1.8.21.custom.css (100%)
 rename {PyTutorGAE => v3}/css/ui-lightness/images/ui-bg_diagonals-thick_18_b81900_40x40.png (100%)
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 rename {PyTutorGAE => v3}/css/ui-lightness/images/ui-icons_ffffff_256x240.png (100%)
 rename {PyTutorGAE => v3}/css/ui-lightness/jquery-ui-1.8.21.custom.css (100%)
 rename {PyTutorGAE => v3}/embedding-examples.js (100%)
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From 774f08750def052284a48254f0c7f5d34df29c77 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 1 Sep 2012 10:41:14 -0700
Subject: [PATCH 180/502] remove example-code symlink

---
 v3/example-code | 1 -
 1 file changed, 1 deletion(-)
 delete mode 120000 v3/example-code

diff --git a/v3/example-code b/v3/example-code
deleted file mode 120000
index 153b6e23a..000000000
--- a/v3/example-code
+++ /dev/null
@@ -1 +0,0 @@
-../example-code
\ No newline at end of file

From 86896c80cac18f8b35af201ef2b8050c3e57e37a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 1 Sep 2012 10:41:35 -0700
Subject: [PATCH 181/502] move example-code/ directory into v3/

---
 {example-code => v3/example-code}/aliasing.golden              | 0
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 {example-code => v3/example-code}/memo_fib.golden              | 0
 {example-code => v3/example-code}/memo_fib.txt                 | 0
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 {example-code => v3/example-code}/oop_2.golden                 | 0
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 {example-code => v3/example-code}/oop_inherit.golden           | 0
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 {example-code => v3/example-code}/oop_small.golden             | 0
 {example-code => v3/example-code}/oop_small.txt                | 0
 {example-code => v3/example-code}/py_tutorial.golden           | 0
 {example-code => v3/example-code}/py_tutorial.txt              | 0
 {example-code => v3/example-code}/sqrt.golden                  | 0
 {example-code => v3/example-code}/sqrt.txt                     | 0
 {example-code => v3/example-code}/strtok.golden                | 0
 {example-code => v3/example-code}/strtok.txt                   | 0
 {example-code => v3/example-code}/sum-cubes.golden             | 0
 {example-code => v3/example-code}/sum-cubes.txt                | 0
 {example-code => v3/example-code}/sum.golden                   | 0
 {example-code => v3/example-code}/sum.txt                      | 0
 {example-code => v3/example-code}/towers_of_hanoi.golden       | 0
 {example-code => v3/example-code}/towers_of_hanoi.txt          | 0
 {example-code => v3/example-code}/wentworth_gcd.golden         | 0
 {example-code => v3/example-code}/wentworth_gcd.txt            | 0
 {example-code => v3/example-code}/wentworth_sumList.golden     | 0
 {example-code => v3/example-code}/wentworth_sumList.txt        | 0
 {example-code => v3/example-code}/wentworth_try_finally.golden | 0
 {example-code => v3/example-code}/wentworth_try_finally.txt    | 0
 74 files changed, 0 insertions(+), 0 deletions(-)
 rename {example-code => v3/example-code}/aliasing.golden (100%)
 rename {example-code => v3/example-code}/aliasing.txt (100%)
 rename {example-code => v3/example-code}/aliasing/aliasing1.golden (100%)
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 rename {example-code => v3/example-code}/aliasing/aliasing2.golden (100%)
 rename {example-code => v3/example-code}/aliasing/aliasing2.txt (100%)
 rename {example-code => v3/example-code}/aliasing/aliasing3.golden (100%)
 rename {example-code => v3/example-code}/aliasing/aliasing3.txt (100%)
 rename {example-code => v3/example-code}/aliasing/aliasing4.golden (100%)
 rename {example-code => v3/example-code}/aliasing/aliasing4.txt (100%)
 rename {example-code => v3/example-code}/aliasing/aliasing5.golden (100%)
 rename {example-code => v3/example-code}/aliasing/aliasing5.txt (100%)
 rename {example-code => v3/example-code}/aliasing/aliasing6.golden (100%)
 rename {example-code => v3/example-code}/aliasing/aliasing6.txt (100%)
 rename {example-code => v3/example-code}/aliasing/aliasing7.golden (100%)
 rename {example-code => v3/example-code}/aliasing/aliasing7.txt (100%)
 rename {example-code => v3/example-code}/aliasing/aliasing8.golden (100%)
 rename {example-code => v3/example-code}/aliasing/aliasing8.txt (100%)
 rename {example-code => v3/example-code}/closures/closure1.golden (100%)
 rename {example-code => v3/example-code}/closures/closure1.txt (100%)
 rename {example-code => v3/example-code}/closures/closure2.golden (100%)
 rename {example-code => v3/example-code}/closures/closure2.txt (100%)
 rename {example-code => v3/example-code}/closures/closure3.golden (100%)
 rename {example-code => v3/example-code}/closures/closure3.txt (100%)
 rename {example-code => v3/example-code}/closures/closure4.golden (100%)
 rename {example-code => v3/example-code}/closures/closure4.txt (100%)
 rename {example-code => v3/example-code}/closures/closure5.golden (100%)
 rename {example-code => v3/example-code}/closures/closure5.txt (100%)
 rename {example-code => v3/example-code}/closures/lambda-param.golden (100%)
 rename {example-code => v3/example-code}/closures/lambda-param.txt (100%)
 rename {example-code => v3/example-code}/decorators.golden (100%)
 rename {example-code => v3/example-code}/decorators.txt (100%)
 rename {example-code => v3/example-code}/fact.golden (100%)
 rename {example-code => v3/example-code}/fact.txt (100%)
 rename {example-code => v3/example-code}/fib.golden (100%)
 rename {example-code => v3/example-code}/fib.txt (100%)
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 rename {example-code => v3/example-code}/ins_sort.txt (100%)
 rename {example-code => v3/example-code}/linked-lists/ll1.golden (100%)
 rename {example-code => v3/example-code}/linked-lists/ll1.txt (100%)
 rename {example-code => v3/example-code}/linked-lists/ll2.golden (100%)
 rename {example-code => v3/example-code}/linked-lists/ll2.txt (100%)
 rename {example-code => v3/example-code}/map.golden (100%)
 rename {example-code => v3/example-code}/map.txt (100%)
 rename {example-code => v3/example-code}/memo_fib.golden (100%)
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 rename {example-code => v3/example-code}/oop_1.txt (100%)
 rename {example-code => v3/example-code}/oop_2.golden (100%)
 rename {example-code => v3/example-code}/oop_2.txt (100%)
 rename {example-code => v3/example-code}/oop_inherit.golden (100%)
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 rename {example-code => v3/example-code}/wentworth_sumList.txt (100%)
 rename {example-code => v3/example-code}/wentworth_try_finally.golden (100%)
 rename {example-code => v3/example-code}/wentworth_try_finally.txt (100%)

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From d88132c67a302024bef07eccba29c6e6d428f97b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 1 Sep 2012 10:44:06 -0700
Subject: [PATCH 182/502] re-added symlink

---
 v3/tests/example-code | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/tests/example-code b/v3/tests/example-code
index 5a6481d0b..153b6e23a 120000
--- a/v3/tests/example-code
+++ b/v3/tests/example-code
@@ -1 +1 @@
-../../example-code
\ No newline at end of file
+../example-code
\ No newline at end of file

From 5da2371acb9ddf316e37e4a64ba9a73b50f842a3 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 1 Sep 2012 10:47:51 -0700
Subject: [PATCH 183/502] moved existing top-level code into v2/

---
 Python3-porting.txt => v2/Python3-porting.txt       |   0
 README => v2/README                                 |   0
 TODO => v2/TODO                                     |   0
 alias-screenshot.png => v2/alias-screenshot.png     | Bin
 {cgi-bin => v2/cgi-bin}/.htaccess                   |   0
 {cgi-bin => v2/cgi-bin}/create_db.py                |   0
 {cgi-bin => v2/cgi-bin}/db_common.py                |   0
 {cgi-bin => v2/cgi-bin}/index.html                  |   0
 {cgi-bin => v2/cgi-bin}/load_question.py            |   0
 {cgi-bin => v2/cgi-bin}/p4_encoder.py               |   0
 {cgi-bin => v2/cgi-bin}/parse_questions.py          |   0
 {cgi-bin => v2/cgi-bin}/pg_encoder.py               |   0
 {cgi-bin => v2/cgi-bin}/pg_logger.py                |   0
 {cgi-bin => v2/cgi-bin}/run_tests.py                |   0
 {cgi-bin => v2/cgi-bin}/web_exec.py                 |   0
 {cgi-bin => v2/cgi-bin}/web_run_test.py             |   0
 .../edu-python-questions.js                         |   0
 edu-python-title.css => v2/edu-python-title.css     |   0
 edu-python-tutor.js => v2/edu-python-tutor.js       |   0
 edu-python.css => v2/edu-python.css                 |   0
 edu-python.js => v2/edu-python.js                   |   0
 v2/example-code                                     |   1 +
 grading-375.png => v2/grading-375.png               | Bin
 hunt-mcilroy.js => v2/hunt-mcilroy.js               |   0
 index.html => v2/index.html                         |   0
 jquery-1.3.2.min.js => v2/jquery-1.3.2.min.js       |   0
 jquery.autogrow.js => v2/jquery.autogrow.js         |   0
 jquery.ba-bbq.min.js => v2/jquery.ba-bbq.min.js     |   0
 jquery.corner.js => v2/jquery.corner.js             |   0
 .../jquery.jsPlumb-1.3.3-all-min.js                 |   0
 jquery.min.js => v2/jquery.min.js                   |   0
 jsplumb-test.js => v2/jsplumb-test.js               |   0
 mock-data.js => v2/mock-data.js                     |   0
 question.html => v2/question.html                   |   0
 {questions => v2/questions}/debug-bsearch.txt       |   0
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 {questions => v2/questions}/debug-mergesort.txt     |   0
 {questions => v2/questions}/optimize-find-dups.txt  |   0
 {questions => v2/questions}/optimize-search.txt     |   0
 {questions => v2/questions}/optimize-sum.txt        |   0
 {questions => v2/questions}/remove-dups.txt         |   0
 {questions => v2/questions}/reverse.txt             |   0
 {questions => v2/questions}/two-sum.txt             |   0
 red-sad-face.jpg => v2/red-sad-face.jpg             | Bin
 .../test-programs}/caught_exception_1.golden        |   0
 .../test-programs}/caught_exception_1.py            |   0
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 .../test-programs}/caught_exception_2.py            |   0
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 .../test-programs}/circ_ref_fake.py                 |   0
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 {test-programs => v2/test-programs}/class_test_3.py |   0
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 {test-programs => v2/test-programs}/data_test.py    |   0
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 {test-programs => v2/test-programs}/dict_error.py   |   0
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 {test-programs => v2/test-programs}/dict_test.py    |   0
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 {test-programs => v2/test-programs}/exec_test.py    |   0
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 .../test-programs}/generator_test.golden            |   0
 .../test-programs}/generator_test.py                |   0
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 {test-programs => v2/test-programs}/import_error.py |   0
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 .../test-programs}/infinite_loop_one_liner.py       |   0
 {test-programs => v2/test-programs}/lambda_1.golden |   0
 {test-programs => v2/test-programs}/lambda_1.py     |   0
 .../test-programs}/list_dict_test.golden            |   0
 .../test-programs}/list_dict_test.py                |   0
 .../test-programs}/list_test.golden                 |   0
 {test-programs => v2/test-programs}/list_test.py    |   0
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 {test-programs => v2/test-programs}/one_func.py     |   0
 .../test-programs}/open_error.golden                |   0
 {test-programs => v2/test-programs}/open_error.py   |   0
 .../test-programs}/parse_error.golden               |   0
 {test-programs => v2/test-programs}/parse_error.py  |   0
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 .../test-programs}/parse_error_2.py                 |   0
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 .../test-programs}/parse_error_3.py                 |   0
 .../test-programs}/print_builtins_error.golden      |   0
 .../test-programs}/print_builtins_error.py          |   0
 .../test-programs}/runtime_error.golden             |   0
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 {test-programs => v2/test-programs}/set_test.golden |   0
 {test-programs => v2/test-programs}/set_test.py     |   0
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From fd5e47972aae63a14bd015ab0cd3e37ac0c01715 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 1 Sep 2012 10:54:58 -0700
Subject: [PATCH 184/502] moved .htaccess

---
 .htaccess => v2/.htaccess | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 rename .htaccess => v2/.htaccess (100%)

diff --git a/.htaccess b/v2/.htaccess
similarity index 100%
rename from .htaccess
rename to v2/.htaccess

From 8266973f28e0e956c1b6a85a5bea3e085d79ce7b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 1 Sep 2012 11:07:27 -0700
Subject: [PATCH 185/502] another big renaming of v2/ -> v1-v2/

---
 README                                        |  33 ++++++++++++++++++
 {v2 => v1-v2}/.htaccess                       |   0
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 {v2 => v1-v2}/README                          |   5 +++
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 {v2 => v1-v2}/cgi-bin/load_question.py        |   0
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 {v2 => v1-v2}/cgi-bin/pg_logger.py            |   0
 {v2 => v1-v2}/cgi-bin/run_tests.py            |   0
 {v2 => v1-v2}/cgi-bin/web_exec.py             |   0
 {v2 => v1-v2}/cgi-bin/web_run_test.py         |   0
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 {v2 => v1-v2}/tutor.html                      |   0
 {v2 => v1-v2}/tutorials/MIT-6.01/README       |   0
 {v2 => v1-v2}/tutorials/MIT-6.01/map.py       |   0
 {v2 => v1-v2}/tutorials/MIT-6.01/oop_1.py     |   0
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 {v2 => v1-v2}/tutorials/MIT-6.01/oop_3.py     |   0
 {v2 => v1-v2}/tutorials/MIT-6.01/summation.py |   0
 {v2 => v1-v2}/tutorials/README                |   0
 {v2 => v1-v2}/tutorials/advanced/map.py       |   0
 {v2 => v1-v2}/tutorials/math/newton.py        |   0
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 .../personal-finance/compound_interest.py     |   0
 {v2 => v1-v2}/yellow-happy-face.png           | Bin
 125 files changed, 38 insertions(+)
 create mode 100644 README
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 rename {v2 => v1-v2}/Python3-porting.txt (100%)
 rename {v2 => v1-v2}/README (97%)
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 rename {v2 => v1-v2}/cgi-bin/pg_encoder.py (100%)
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 rename {v2 => v1-v2}/hunt-mcilroy.js (100%)
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diff --git a/README b/README
new file mode 100644
index 000000000..fec3998f6
--- /dev/null
+++ b/README
@@ -0,0 +1,33 @@
+Online Python Tutor
+https://github.com/pgbovine/OnlinePythonTutor/
+
+Copyright (C) 2010-2012 Philip J. Guo (philip@pgbovine.net)
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+======
+
+v1-v2/
+  Version 1 - Released on January 19, 2010
+  Version 2 - Released on October  4, 2011
+
+v3/
+  Version 3 - Released in September 2012
+
diff --git a/v2/.htaccess b/v1-v2/.htaccess
similarity index 100%
rename from v2/.htaccess
rename to v1-v2/.htaccess
diff --git a/v2/Python3-porting.txt b/v1-v2/Python3-porting.txt
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index f24d68b2e..8726a706f 100644
--- a/v2/README
+++ b/v1-v2/README
@@ -22,6 +22,11 @@ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+======
+This directory contains the contents of Versions 1 and 2:
+
+Version 1 - Released on January 19, 2010
+Version 2 - Released on October  4, 2011
 
 ======
 Introduction:
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From 0b563fc5a91bd1c467a029013044241faa7bd77e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 2 Sep 2012 11:39:23 -0700
Subject: [PATCH 186/502] added prototype lesson.html

---
 v3/css/opt-lessons.css |  81 ++++++++
 v3/js/opt-lessons.js   | 422 +++++++++++++++++++++++++++++++++++++++++
 v3/lesson.html         | 101 ++++++++++
 v3/pythontutor.py      |   9 +
 4 files changed, 613 insertions(+)
 create mode 100644 v3/css/opt-lessons.css
 create mode 100644 v3/js/opt-lessons.js
 create mode 100644 v3/lesson.html

diff --git a/v3/css/opt-lessons.css b/v3/css/opt-lessons.css
new file mode 100644
index 000000000..698fe4280
--- /dev/null
+++ b/v3/css/opt-lessons.css
@@ -0,0 +1,81 @@
+/* CSS accompanying ../tutor.html */
+
+h1 {
+  font-weight: normal;
+  font-size: 20pt;
+  font-family: georgia, serif;
+  line-height: 1em;  /* enforce single spacing so that Georgia works */
+
+  margin-top: 0px;
+  margin-bottom: 8px;
+}
+
+h2 {
+  font-size: 12pt;
+  font-weight: normal;
+  font-family: georgia, serif;
+  line-height: 1.1em; /* enforce single spacing so that Georgia works */
+
+  margin-top: 2px;
+  margin-bottom: 20px;
+}
+
+
+body {
+  background-color: white;
+  font-family: verdana, arial, helvetica, sans-serif;
+  font-size: 10pt;
+}
+
+a,
+a:visited,
+a:hover {
+  color: #3D58A2;
+}
+
+span {
+  padding: 0px;
+}
+
+table#pyOutputPane {
+  padding: 10px;
+}
+
+#pyInputPane {
+  margin-top: 20px;
+  margin-bottom: 20px;
+
+  max-width: 700px;
+  /* center align */
+  margin-left: auto;
+  margin-right: auto;
+}
+
+#codeInputPane {
+  margin-top: 5px;
+  font-size: 12pt;
+}
+
+button.smallBtn {
+  font-size: 10pt;
+  padding: 3px;
+}
+
+button.bigBtn {
+  font-size: 12pt;
+  padding: 5px;
+}
+
+#footer {
+  color: #666666;
+  font-size: 9pt;
+  border-top: 1px solid #bbbbbb;
+  padding-top: 5px;
+  margin-top: 5px;
+
+  max-width: 700px;
+  /* center align */
+  margin-left: auto;
+  margin-right: auto;
+}
+
diff --git a/v3/js/opt-lessons.js b/v3/js/opt-lessons.js
new file mode 100644
index 000000000..f755c8fed
--- /dev/null
+++ b/v3/js/opt-lessons.js
@@ -0,0 +1,422 @@
+/*
+
+Online Python Tutor
+https://github.com/pgbovine/OnlinePythonTutor/
+
+Copyright (C) 2010-2012 Philip J. Guo (philip@pgbovine.net)
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+*/
+
+
+// Pre-reqs: pytutor.js and jquery.ba-bbq.min.js should be imported BEFORE this file
+
+var backend_script = 'exec'; // URL of backend script, which must eventually call pg_logger.py
+
+var appMode = 'edit'; // 'edit' or 'visualize'
+
+var preseededCode = null;     // if you passed in a 'code=' in the URL, then set this var
+var preseededCurInstr = null; // if you passed in a 'curInstr=' in the URL, then set this var
+
+
+var myVisualizer = null; // singleton ExecutionVisualizer instance
+
+function enterEditMode() {
+  $.bbq.pushState({ mode: 'edit' }, 2 /* completely override other hash strings to keep URL clean */);
+}
+
+
+var pyInputCodeMirror; // CodeMirror object that contains the input text
+
+function setCodeMirrorVal(dat) {
+  pyInputCodeMirror.setValue(dat.rtrim() /* kill trailing spaces */);
+}
+
+
+$(document).ready(function() {
+
+  pyInputCodeMirror = CodeMirror(document.getElementById('codeInputPane'), {
+    mode: 'python',
+    lineNumbers: true,
+    tabSize: 2,
+    // convert tab into two spaces:
+    extraKeys: {Tab: function(cm) {cm.replaceSelection("  ", "end");}}
+  });
+
+  pyInputCodeMirror.setSize(null, '450px');
+
+
+
+  // be friendly to the browser's forward and back buttons
+  // thanks to http://benalman.com/projects/jquery-bbq-plugin/
+  $(window).bind("hashchange", function(e) {
+    appMode = $.bbq.getState('mode'); // assign this to the GLOBAL appMode
+
+    preseededCode = $.bbq.getState('code'); // yuck, global!
+    var preseededMode = $.bbq.getState('mode');
+
+    if ($.bbq.getState('cumulative_mode') == 'true') {
+      $('#cumulativeMode').prop('checked', true);
+    }
+
+    // only bother with curInstr when we're visualizing ...
+    if (!preseededCurInstr && preseededMode == 'visualize') { // TODO: kinda gross hack
+      preseededCurInstr = Number($.bbq.getState('curInstr'));
+    }
+
+    // default mode is 'edit'
+    if (appMode == undefined) {
+      appMode = 'edit';
+    }
+
+    // if there's no myVisualizer, then default to edit mode since there's
+    // nothing to visualize:
+    if (!myVisualizer) {
+      appMode = 'edit';
+
+      if (preseededCode && preseededMode == 'visualize') {
+        // punt for now ...
+      }
+      else {
+        $.bbq.pushState({ mode: 'edit' }, 2 /* completely override other hash strings to keep URL clean */);
+      }
+    }
+
+
+    if (appMode == 'edit') {
+      $("#pyInputPane").show();
+      $("#pyOutputPane").hide();
+    }
+    else if (appMode == 'visualize') {
+      $("#pyInputPane").hide();
+      $("#pyOutputPane").show();
+
+      $('#executeBtn').html("Visualize execution");
+      $('#executeBtn').attr('disabled', false);
+
+
+      // do this AFTER making #pyOutputPane visible, or else
+      // jsPlumb connectors won't render properly
+      myVisualizer.updateOutput();
+
+      // grab focus so that keyboard events work
+      myVisualizer.grabKeyboardFocus();
+
+      // customize edit button click functionality AFTER rendering (TODO: awkward!)
+      $('#pyOutputPane #editBtn').click(function() {
+        enterEditMode();
+      });
+
+    }
+    else {
+      assert(false);
+    }
+  });
+
+  // From: http://benalman.com/projects/jquery-bbq-plugin/
+  //   Since the event is only triggered when the hash changes, we need
+  //   to trigger the event now, to handle the hash the page may have
+  //   loaded with.
+  $(window).trigger( "hashchange" );
+
+
+  $("#executeBtn").attr('disabled', false);
+  $("#executeBtn").click(function() {
+    $('#executeBtn').html("Please wait ... processing your code");
+    $('#executeBtn').attr('disabled', true);
+    $("#pyOutputPane").hide();
+
+
+    $.get(backend_script,
+          {user_script : pyInputCodeMirror.getValue(),
+           cumulative_mode: $('#cumulativeMode').prop('checked')},
+          function(dataFromBackend) {
+            var trace = dataFromBackend.trace;
+            
+            // don't enter visualize mode if there are killer errors:
+            if (!trace ||
+                (trace.length == 0) ||
+                (trace[trace.length - 1].event == 'uncaught_exception')) {
+
+              if (trace.length == 1) {
+                var errorLineNo = trace[0].line - 1; /* CodeMirror lines are zero-indexed */
+                if (errorLineNo !== undefined) {
+                  // highlight the faulting line in pyInputCodeMirror
+                  pyInputCodeMirror.focus();
+                  pyInputCodeMirror.setCursor(errorLineNo, 0);
+                  pyInputCodeMirror.setLineClass(errorLineNo, null, 'errorLine');
+
+                  pyInputCodeMirror.setOption('onChange', function() {
+                    pyInputCodeMirror.setLineClass(errorLineNo, null, null); // reset line back to normal
+                    pyInputCodeMirror.setOption('onChange', null); // cancel
+                  });
+                }
+
+                alert(trace[0].exception_msg);
+              }
+              else {
+                alert("Whoa, unknown error! Reload to try again, or report a bug to philip@pgbovine.net\n\n(Click the 'Generate URL' button to include a unique URL in your email bug report.)");
+              }
+
+              $('#executeBtn').html("Visualize execution");
+              $('#executeBtn').attr('disabled', false);
+            }
+            else {
+              var startingInstruction = 0;
+
+              // only do this at most ONCE, and then clear out preseededCurInstr
+              if (preseededCurInstr && preseededCurInstr < trace.length) { // NOP anyways if preseededCurInstr is 0
+                startingInstruction = preseededCurInstr;
+                preseededCurInstr = null;
+              }
+
+              myVisualizer = new ExecutionVisualizer('pyOutputPane',
+                                                     dataFromBackend,
+                                                     {startingInstruction: startingInstruction});
+
+              $.bbq.pushState({ mode: 'visualize' }, 2 /* completely override other hash strings to keep URL clean */);
+            }
+          },
+          "json");
+  });
+
+
+
+  // canned examples
+
+  $("#tutorialExampleLink").click(function() {
+    $.get("example-code/py_tutorial.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#strtokExampleLink").click(function() {
+    $.get("example-code/strtok.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#fibonacciExampleLink").click(function() {
+    $.get("example-code/fib.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#memoFibExampleLink").click(function() {
+    $.get("example-code/memo_fib.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#factExampleLink").click(function() {
+    $.get("example-code/fact.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#filterExampleLink").click(function() {
+    $.get("example-code/filter.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#insSortExampleLink").click(function() {
+    $.get("example-code/ins_sort.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#aliasExampleLink").click(function() {
+    $.get("example-code/aliasing.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#newtonExampleLink").click(function() {
+    $.get("example-code/sqrt.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#oopSmallExampleLink").click(function() {
+    $.get("example-code/oop_small.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#mapExampleLink").click(function() {
+    $.get("example-code/map.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#oop1ExampleLink").click(function() {
+    $.get("example-code/oop_1.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#oop2ExampleLink").click(function() {
+    $.get("example-code/oop_2.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#inheritanceExampleLink").click(function() {
+    $.get("example-code/oop_inherit.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#sumExampleLink").click(function() {
+    $.get("example-code/sum.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#pwGcdLink").click(function() {
+    $.get("example-code/wentworth_gcd.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#pwSumListLink").click(function() {
+    $.get("example-code/wentworth_sumList.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#towersOfHanoiLink").click(function() {
+    $.get("example-code/towers_of_hanoi.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#pwTryFinallyLink").click(function() {
+    $.get("example-code/wentworth_try_finally.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#sumCubesLink").click(function() {
+    $.get("example-code/sum-cubes.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $("#decoratorsLink").click(function() {
+    $.get("example-code/decorators.txt", setCodeMirrorVal);
+    return false;
+  });
+
+
+
+  $('#closure1Link').click(function() {
+    $.get("example-code/closures/closure1.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#closure2Link').click(function() {
+    $.get("example-code/closures/closure2.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#closure3Link').click(function() {
+    $.get("example-code/closures/closure3.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#closure4Link').click(function() {
+    $.get("example-code/closures/closure4.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#closure5Link').click(function() {
+    $.get("example-code/closures/closure5.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#lambdaParamLink').click(function() {
+    $.get("example-code/closures/lambda-param.txt", setCodeMirrorVal);
+    return false;
+  });
+
+
+  $('#aliasing1Link').click(function() {
+    $.get("example-code/aliasing/aliasing1.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#aliasing2Link').click(function() {
+    $.get("example-code/aliasing/aliasing2.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#aliasing3Link').click(function() {
+    $.get("example-code/aliasing/aliasing3.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#aliasing4Link').click(function() {
+    $.get("example-code/aliasing/aliasing4.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#aliasing5Link').click(function() {
+    $.get("example-code/aliasing/aliasing5.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#aliasing6Link').click(function() {
+    $.get("example-code/aliasing/aliasing6.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#aliasing7Link').click(function() {
+    $.get("example-code/aliasing/aliasing7.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#aliasing8Link').click(function() {
+    $.get("example-code/aliasing/aliasing8.txt", setCodeMirrorVal);
+    return false;
+  });
+
+
+  $('#ll1Link').click(function() {
+    $.get("example-code/linked-lists/ll1.txt", setCodeMirrorVal);
+    return false;
+  });
+  $('#ll2Link').click(function() {
+    $.get("example-code/linked-lists/ll2.txt", setCodeMirrorVal);
+    return false;
+  });
+
+
+  if (preseededCode) {
+    setCodeMirrorVal(preseededCode);
+
+    if ($.bbq.getState('mode') != 'edit') {
+      $("#executeBtn").trigger('click');
+    }
+  }
+  else {
+    // select a canned example on start-up:
+    $("#aliasExampleLink").trigger('click');
+  }
+
+
+  // log a generic AJAX error handler
+  $(document).ajaxError(function() {
+    alert("Server error (possibly due to memory/resource overload).");
+
+    $('#executeBtn').html("Visualize execution");
+    $('#executeBtn').attr('disabled', false);
+  });
+
+
+  // redraw connector arrows on window resize
+  $(window).resize(function() {
+    if (appMode == 'visualize') {
+      myVisualizer.redrawConnectors();
+    }
+  });
+
+  $('#genUrlBtn').bind('click', function() {
+    var urlStr = $.param.fragment(window.location.href,
+                                  {code: pyInputCodeMirror.getValue(),
+                                   curInstr: (appMode == 'visualize') ? myVisualizer.curInstr : 0,
+                                   mode: appMode,
+                                   cumulative_mode: $('#cumulativeMode').prop('checked')
+                                  },
+                                  2);
+    $('#urlOutput').val(urlStr);
+  });
+});
+
diff --git a/v3/lesson.html b/v3/lesson.html
new file mode 100644
index 000000000..34e798ec1
--- /dev/null
+++ b/v3/lesson.html
@@ -0,0 +1,101 @@
+
+
+
+
+
+
+  Online Python Tutor (v3)
+
+
+
+
+ 
+ 
+ 
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

+
+Write your Python code here:
+

+
+
 
+
+

+
+

+
+
+

+

+
+
+
+
+
+
diff --git a/v3/pythontutor.py b/v3/pythontutor.py
index 9f40d6696..3bb731160 100644
--- a/v3/pythontutor.py
+++ b/v3/pythontutor.py
@@ -48,6 +48,14 @@ def get(self):
     self.response.out.write(template.render())
 
 
+class LessonPage(webapp2.RequestHandler):
+
+  def get(self):
+    self.response.headers['Content-Type'] = 'text/html'
+    template = JINJA_ENVIRONMENT.get_template('lesson.html')
+    self.response.out.write(template.render())
+
+
 class ExecScript(webapp2.RequestHandler):
 
   def json_finalizer(self, input_code, output_trace):
@@ -68,6 +76,7 @@ def get(self):
 
 
 app = webapp2.WSGIApplication([('/', TutorPage),
+                               ('/lesson.html', LessonPage),
                                ('/exec', ExecScript)],
                               debug=True)
 

From 8f39ac7efcab99722c3ec04c7c7bdbc206cf3a0e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 2 Sep 2012 12:39:48 -0700
Subject: [PATCH 187/502] added embeddedMode param to ExecutionVisualizer

---
 v3/js/pytutor.js | 33 +++++++++++++++++++++++++++------
 1 file changed, 27 insertions(+), 6 deletions(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 80a5e5fce..9dcee2cf5 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -56,6 +56,7 @@ var curVisualizerID = 1; // global to uniquely identify each ExecutionVisualizer
 //   hideOutput - hide "Program output" and "Generate URL" displays
 //   codeDivHeight - maximum height of #pyCodeOutputDiv (in pixels)
 //   editCodeBaseURL - the base URL to visit when the user clicks 'Edit code'
+//   embeddedMode - make the widget narrower horizontally and disable breakpoints
 function ExecutionVisualizer(domRootID, dat, params) {
   this.curInputCode = dat.code.rtrim(); // kill trailing spaces
   this.curTrace = dat.trace;
@@ -159,9 +160,9 @@ ExecutionVisualizer.prototype.render = function() {
           
\
           
\
             \
-            \
+            \
             Step ? of ?\
-            \
+            \
             \
           
\
           
\
@@ -207,6 +208,23 @@ ExecutionVisualizer.prototype.render = function() {
   }
 
 
+  if (this.params.embeddedMode) {
+    this.params.hideOutput = true; // put this before hideOutput handler
+
+    this.domRoot.find('#executionSlider')
+      .css('width', '320px')
+      .css('margin', '6px auto');
+
+    this.domRoot.find('#executionSliderCaption').hide();
+    this.domRoot.find('#jmpFirstInstr').hide();
+    this.domRoot.find('#jmpLastInstr').hide();
+
+    this.domRoot.find('#pyCodeOutputDiv')
+      .css('max-width', '350px');
+
+  }
+
+
   // create a persistent globals frame
   // (note that we need to keep #globals_area separate from #stack for d3 to work its magic)
   this.domRoot.find("#globals_area").append('
\
           
\
             \
-            \
+            \
             Step ? of ?\
-            \
+            \
             \
           
\
           
\
@@ -212,7 +212,7 @@ ExecutionVisualizer.prototype.render = function() {
     this.params.hideOutput = true; // put this before hideOutput handler
 
     this.domRoot.find('#executionSlider')
-      .css('width', '320px')
+      .css('width', '330px')
       .css('margin', '6px auto');
 
     this.domRoot.find('#executionSliderCaption').hide();
@@ -220,7 +220,8 @@ ExecutionVisualizer.prototype.render = function() {
     this.domRoot.find('#jmpLastInstr').hide();
 
     this.domRoot.find('#pyCodeOutputDiv')
-      .css('max-width', '350px');
+      .css('max-width', '350px')
+      .css('max-height', '400px');
 
   }
 

From 1760f3595d53b7c518208601ca68e0dca6be09d4 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 2 Sep 2012 12:56:51 -0700
Subject: [PATCH 189/502] bah

---
 v3/css/opt-lessons.css |  25 +++--
 v3/js/opt-lessons.js   | 229 +----------------------------------------
 v3/lesson.html         |  24 ++---
 3 files changed, 34 insertions(+), 244 deletions(-)

diff --git a/v3/css/opt-lessons.css b/v3/css/opt-lessons.css
index 698fe4280..6f5e3b0c9 100644
--- a/v3/css/opt-lessons.css
+++ b/v3/css/opt-lessons.css
@@ -1,4 +1,4 @@
-/* CSS accompanying ../tutor.html */
+/* CSS accompanying ../lesson.html */
 
 h1 {
   font-weight: normal;
@@ -25,6 +25,24 @@ body {
   background-color: white;
   font-family: verdana, arial, helvetica, sans-serif;
   font-size: 10pt;
+
+  max-width: 900px;
+  /* center align */
+  margin-left: auto;
+  margin-right: auto;
+}
+
+div#lessonHeader {
+  margin-bottom: 15pt;
+}
+
+div#lessonTitle {
+  font-size: 16pt;
+  margin-bottom: 10pt;
+}
+
+div#lessonExposition {
+  font-size: 12pt;
 }
 
 a,
@@ -72,10 +90,5 @@ button.bigBtn {
   border-top: 1px solid #bbbbbb;
   padding-top: 5px;
   margin-top: 5px;
-
-  max-width: 700px;
-  /* center align */
-  margin-left: auto;
-  margin-right: auto;
 }
 
diff --git a/v3/js/opt-lessons.js b/v3/js/opt-lessons.js
index f755c8fed..0c21b3f03 100644
--- a/v3/js/opt-lessons.js
+++ b/v3/js/opt-lessons.js
@@ -33,9 +33,6 @@ var backend_script = 'exec'; // URL of backend script, which must eventually cal
 
 var appMode = 'edit'; // 'edit' or 'visualize'
 
-var preseededCode = null;     // if you passed in a 'code=' in the URL, then set this var
-var preseededCurInstr = null; // if you passed in a 'curInstr=' in the URL, then set this var
-
 
 var myVisualizer = null; // singleton ExecutionVisualizer instance
 
@@ -70,18 +67,6 @@ $(document).ready(function() {
   $(window).bind("hashchange", function(e) {
     appMode = $.bbq.getState('mode'); // assign this to the GLOBAL appMode
 
-    preseededCode = $.bbq.getState('code'); // yuck, global!
-    var preseededMode = $.bbq.getState('mode');
-
-    if ($.bbq.getState('cumulative_mode') == 'true') {
-      $('#cumulativeMode').prop('checked', true);
-    }
-
-    // only bother with curInstr when we're visualizing ...
-    if (!preseededCurInstr && preseededMode == 'visualize') { // TODO: kinda gross hack
-      preseededCurInstr = Number($.bbq.getState('curInstr'));
-    }
-
     // default mode is 'edit'
     if (appMode == undefined) {
       appMode = 'edit';
@@ -91,13 +76,7 @@ $(document).ready(function() {
     // nothing to visualize:
     if (!myVisualizer) {
       appMode = 'edit';
-
-      if (preseededCode && preseededMode == 'visualize') {
-        // punt for now ...
-      }
-      else {
-        $.bbq.pushState({ mode: 'edit' }, 2 /* completely override other hash strings to keep URL clean */);
-      }
+      $.bbq.pushState({ mode: 'edit' }, 2 /* completely override other hash strings to keep URL clean */);
     }
 
 
@@ -180,17 +159,9 @@ $(document).ready(function() {
               $('#executeBtn').attr('disabled', false);
             }
             else {
-              var startingInstruction = 0;
-
-              // only do this at most ONCE, and then clear out preseededCurInstr
-              if (preseededCurInstr && preseededCurInstr < trace.length) { // NOP anyways if preseededCurInstr is 0
-                startingInstruction = preseededCurInstr;
-                preseededCurInstr = null;
-              }
-
               myVisualizer = new ExecutionVisualizer('pyOutputPane',
                                                      dataFromBackend,
-                                                     {startingInstruction: startingInstruction});
+                                                     {embeddedMode: true});
 
               $.bbq.pushState({ mode: 'visualize' }, 2 /* completely override other hash strings to keep URL clean */);
             }
@@ -199,199 +170,6 @@ $(document).ready(function() {
   });
 
 
-
-  // canned examples
-
-  $("#tutorialExampleLink").click(function() {
-    $.get("example-code/py_tutorial.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#strtokExampleLink").click(function() {
-    $.get("example-code/strtok.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#fibonacciExampleLink").click(function() {
-    $.get("example-code/fib.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#memoFibExampleLink").click(function() {
-    $.get("example-code/memo_fib.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#factExampleLink").click(function() {
-    $.get("example-code/fact.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#filterExampleLink").click(function() {
-    $.get("example-code/filter.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#insSortExampleLink").click(function() {
-    $.get("example-code/ins_sort.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#aliasExampleLink").click(function() {
-    $.get("example-code/aliasing.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#newtonExampleLink").click(function() {
-    $.get("example-code/sqrt.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#oopSmallExampleLink").click(function() {
-    $.get("example-code/oop_small.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#mapExampleLink").click(function() {
-    $.get("example-code/map.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#oop1ExampleLink").click(function() {
-    $.get("example-code/oop_1.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#oop2ExampleLink").click(function() {
-    $.get("example-code/oop_2.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#inheritanceExampleLink").click(function() {
-    $.get("example-code/oop_inherit.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#sumExampleLink").click(function() {
-    $.get("example-code/sum.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#pwGcdLink").click(function() {
-    $.get("example-code/wentworth_gcd.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#pwSumListLink").click(function() {
-    $.get("example-code/wentworth_sumList.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#towersOfHanoiLink").click(function() {
-    $.get("example-code/towers_of_hanoi.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#pwTryFinallyLink").click(function() {
-    $.get("example-code/wentworth_try_finally.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#sumCubesLink").click(function() {
-    $.get("example-code/sum-cubes.txt", setCodeMirrorVal);
-    return false;
-  });
-
-  $("#decoratorsLink").click(function() {
-    $.get("example-code/decorators.txt", setCodeMirrorVal);
-    return false;
-  });
-
-
-
-  $('#closure1Link').click(function() {
-    $.get("example-code/closures/closure1.txt", setCodeMirrorVal);
-    return false;
-  });
-  $('#closure2Link').click(function() {
-    $.get("example-code/closures/closure2.txt", setCodeMirrorVal);
-    return false;
-  });
-  $('#closure3Link').click(function() {
-    $.get("example-code/closures/closure3.txt", setCodeMirrorVal);
-    return false;
-  });
-  $('#closure4Link').click(function() {
-    $.get("example-code/closures/closure4.txt", setCodeMirrorVal);
-    return false;
-  });
-  $('#closure5Link').click(function() {
-    $.get("example-code/closures/closure5.txt", setCodeMirrorVal);
-    return false;
-  });
-  $('#lambdaParamLink').click(function() {
-    $.get("example-code/closures/lambda-param.txt", setCodeMirrorVal);
-    return false;
-  });
-
-
-  $('#aliasing1Link').click(function() {
-    $.get("example-code/aliasing/aliasing1.txt", setCodeMirrorVal);
-    return false;
-  });
-  $('#aliasing2Link').click(function() {
-    $.get("example-code/aliasing/aliasing2.txt", setCodeMirrorVal);
-    return false;
-  });
-  $('#aliasing3Link').click(function() {
-    $.get("example-code/aliasing/aliasing3.txt", setCodeMirrorVal);
-    return false;
-  });
-  $('#aliasing4Link').click(function() {
-    $.get("example-code/aliasing/aliasing4.txt", setCodeMirrorVal);
-    return false;
-  });
-  $('#aliasing5Link').click(function() {
-    $.get("example-code/aliasing/aliasing5.txt", setCodeMirrorVal);
-    return false;
-  });
-  $('#aliasing6Link').click(function() {
-    $.get("example-code/aliasing/aliasing6.txt", setCodeMirrorVal);
-    return false;
-  });
-  $('#aliasing7Link').click(function() {
-    $.get("example-code/aliasing/aliasing7.txt", setCodeMirrorVal);
-    return false;
-  });
-  $('#aliasing8Link').click(function() {
-    $.get("example-code/aliasing/aliasing8.txt", setCodeMirrorVal);
-    return false;
-  });
-
-
-  $('#ll1Link').click(function() {
-    $.get("example-code/linked-lists/ll1.txt", setCodeMirrorVal);
-    return false;
-  });
-  $('#ll2Link').click(function() {
-    $.get("example-code/linked-lists/ll2.txt", setCodeMirrorVal);
-    return false;
-  });
-
-
-  if (preseededCode) {
-    setCodeMirrorVal(preseededCode);
-
-    if ($.bbq.getState('mode') != 'edit') {
-      $("#executeBtn").trigger('click');
-    }
-  }
-  else {
-    // select a canned example on start-up:
-    $("#aliasExampleLink").trigger('click');
-  }
-
-
   // log a generic AJAX error handler
   $(document).ajaxError(function() {
     alert("Server error (possibly due to memory/resource overload).");
@@ -418,5 +196,8 @@ $(document).ready(function() {
                                   2);
     $('#urlOutput').val(urlStr);
   });
+
+
+  $.get("example-code/aliasing.txt", setCodeMirrorVal);
 });
 
diff --git a/v3/lesson.html b/v3/lesson.html
index 34e798ec1..6b8837aad 100644
--- a/v3/lesson.html
+++ b/v3/lesson.html
@@ -58,10 +58,16 @@
 
 
 
-

+

+
+  
Set Intersection and Union

+
+  
Let's say you have several sets of people
+  that you want to union and intersect ...

 
-Write your Python code here:
-

+

+
+

 
 
 
 
@@ -69,6 +75,7 @@
 
 

 
+

 
 

 

@@ -76,17 +83,6 @@
 
 
-

-
-
 
-
-

-
-

-
-

-
 

 

 
diff --git a/v3/lessons/aliasing.txt b/v3/lessons/aliasing.txt
new file mode 100644
index 000000000..ba4f8b230
--- /dev/null
+++ b/v3/lessons/aliasing.txt
@@ -0,0 +1,10 @@
+x = [1, 2, 3, 4, 5]
+y = x
+z = [1, 2, 3, 4, 5]
+x.append(6)
+======
+{
+  "1": "execution point one",
+  "2": "execution point two",
+  "4": "execution point four"
+}

From 79248d9e0f959273dd2eb8d979ae9721881e9808 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 2 Sep 2012 23:01:18 -0700
Subject: [PATCH 193/502] added 'updateOutputCallback' option

---
 v3/js/pytutor.js | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 8514871b0..c16bf741d 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -57,6 +57,9 @@ var curVisualizerID = 1; // global to uniquely identify each ExecutionVisualizer
 //   codeDivHeight - maximum height of #pyCodeOutputDiv (in pixels)
 //   editCodeBaseURL - the base URL to visit when the user clicks 'Edit code'
 //   embeddedMode - make the widget narrower horizontally and disable breakpoints
+//   updateOutputCallback - function to call (with 'this' as parameter)
+//                          whenever this.updateOutput() is called
+//                          (BEFORE rendering the output display)
 function ExecutionVisualizer(domRootID, dat, params) {
   this.curInputCode = dat.code.rtrim(); // kill trailing spaces
   this.curTrace = dat.trace;
@@ -729,6 +732,13 @@ ExecutionVisualizer.prototype.updateOutput = function() {
 
   assert(this.curTrace);
 
+
+  // call the callback if necessary (BEFORE rendering)
+  if (this.params.updateOutputCallback) {
+    this.params.updateOutputCallback(this);
+  }
+
+
   var curEntry = this.curTrace[this.curInstr];
   var hasError = false;
 

From 5d885f9523b9305cb46cf9c573b9fc1e804909dd Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 2 Sep 2012 23:01:39 -0700
Subject: [PATCH 194/502] added more lessons stuff

---
 v3/css/opt-lessons.css              | 18 ++++++++++---
 v3/js/opt-lessons.js                | 40 ++++++++++++++++++++++++-----
 v3/lesson.html                      | 18 ++++---------
 v3/lessons/dive-into-python-311.txt | 28 ++++++++++++++++++++
 4 files changed, 81 insertions(+), 23 deletions(-)
 create mode 100644 v3/lessons/dive-into-python-311.txt

diff --git a/v3/css/opt-lessons.css b/v3/css/opt-lessons.css
index 684f36c58..16f86b6b8 100644
--- a/v3/css/opt-lessons.css
+++ b/v3/css/opt-lessons.css
@@ -23,7 +23,9 @@ h2 {
 
 body {
   background-color: white;
+
   font-family: verdana, arial, helvetica, sans-serif;
+
   font-size: 10pt;
 
   max-width: 900px;
@@ -38,13 +40,22 @@ div#lessonHeader {
 
 div#lessonTitle {
   font-size: 16pt;
-  margin-bottom: 10pt;
+  margin-bottom: 15pt;
 }
 
-div#lessonExposition {
-  font-size: 12pt;
+div#lessonDescription {
+  font-size: 11pt;
+  line-height: 1.5em;
 }
 
+div#lessonNarration {
+  font-size: 11pt;
+  min-height: 25px;
+  margin-bottom: 8px;
+  line-height: 1.5em;
+}
+
+
 a,
 a:visited,
 a:hover {
@@ -91,4 +102,3 @@ button.bigBtn {
   padding-top: 12px;
   margin-top: 5px;
 }
-
diff --git a/v3/js/opt-lessons.js b/v3/js/opt-lessons.js
index 388003024..6b0491d09 100644
--- a/v3/js/opt-lessons.js
+++ b/v3/js/opt-lessons.js
@@ -33,12 +33,20 @@ var backend_script = 'exec'; // URL of backend script, which must eventually cal
 
 var myVisualizer = null; // singleton ExecutionVisualizer instance
 
+var lessonScript = null;
+var metadataJSON = null;
+
 function parseLessonFile(dat) {
   var toks = dat.split('======');
-  var lessonScript = toks[0].rtrim();
-  var metadataJSON = $.parseJSON(toks[1]);
-  console.log(lessonScript);
-  console.log(metadataJSON);
+
+  // globals
+  lessonScript = toks[0].rtrim();
+  metadataJSON = $.parseJSON(toks[1]);
+
+  $('#lessonTitle').html(metadataJSON.title);
+  $('#lessonDescription').html(metadataJSON.description);
+
+  document.title = metadataJSON.title + ' - Online Python Tutor (v3)';
 
   $.get(backend_script,
         {user_script : lessonScript},
@@ -60,7 +68,8 @@ function parseLessonFile(dat) {
           else {
             myVisualizer = new ExecutionVisualizer('pyOutputPane',
                                                    dataFromBackend,
-                                                   {embeddedMode: true});
+                                                   {embeddedMode: true,
+                                                    updateOutputCallback: updateLessonNarration});
 
             myVisualizer.updateOutput();
 
@@ -71,9 +80,28 @@ function parseLessonFile(dat) {
         "json");
 }
 
+function updateLessonNarration(myViz) {
+  var curInstr = myViz.curInstr;
+
+  assert(metadataJSON);
+
+  var annotation = metadataJSON[curInstr + 1]; // adjust for indexing diffs
+  if (annotation) {
+    $('#lessonNarration').html(annotation);
+  }
+  else {
+    $('#lessonNarration').html('');
+  }
+
+  // hack from John DeNero to ensure that once a div grows it height, it
+  // never shrinks again
+  $('#lessonNarration').css('min-height', $('#lessonNarration').css('height'));
+}
+
 $(document).ready(function() {
 
-  $.get("lessons/aliasing.txt", parseLessonFile);
+  //$.get("lessons/aliasing.txt", parseLessonFile);
+  $.get("lessons/dive-into-python-311.txt", parseLessonFile);
 
   // log a generic AJAX error handler
   $(document).ajaxError(function() {
diff --git a/v3/lesson.html b/v3/lesson.html
index c8330abc9..0c977ba1a 100644
--- a/v3/lesson.html
+++ b/v3/lesson.html
@@ -30,7 +30,7 @@
  -->
 
 
-  Online Python Tutor (v3)
+  
 
 
 
@@ -43,14 +43,6 @@
 
 
 
-
-
-
-
-
-
-
-
 
 
 
@@ -60,13 +52,13 @@
 
 

 
-  
Set Intersection and Union

-
-  
Let's say you have several sets of people
-  that you want to union and intersect ...

+  

+  

 
 

 
+

+
 

 

 
diff --git a/v3/lessons/dive-into-python-311.txt b/v3/lessons/dive-into-python-311.txt
new file mode 100644
index 000000000..14d7daf73
--- /dev/null
+++ b/v3/lessons/dive-into-python-311.txt
@@ -0,0 +1,28 @@
+li = ["a", "b", "mpilgrim", "z", "example"]
+slice1 = li[1:3]
+slice2 = li[1:-1]
+slice3 = li[0:3]
+li.append("new")
+li.insert(2, "new")
+li.extend(["two", "elements"])
+======
+{
+  "title": "Basic List Operations",
+
+  "description": "This lesson was derived from Section 3.2 of Dive Into Python.",
+
+  "2": "First, you define a list of five elements. Note that they retain their original order. This is not an accident. A list is an ordered set of elements enclosed in square brackets.",
+
+  "3": "You can get a subset of a list, called a \"slice\", by specifying two indices. The return value is a new list containing all the elements of the list, in order, starting with the first slice index (in this case li[1]), up to but not including the second slice index (in this case li[3]).",
+
+  "4": "Slicing works if one or both of the slice indices is negative.  If it helps, you can think of it this way: reading the list from left to right, the first slice index specifies the first element you want, and the second slice index specifies the first element you don't want.  The return value is everything in between.",
+
+  "5": "Lists are zero-based, so li[0:3] returns the first three elements of the list, starting at li[0], up to but not including li[3].",
+
+  "6": "append adds a single element to the end of the list.",
+
+  "7": "insert inserts a single element into a list. The numeric argument is the index of the first element that gets bumped out of position. Note that list elements do not need to be unique; there are now two separate elements with the value 'new', li[2] and li[6].",
+
+  "8": "extend concatenates lists. Note that you do not call extend with multiple arguments; you call it with one argument, a list. In this case, that list has two elements."
+
+}

From d2f5466b35b5a9a42445ced29aa09009b7a1230f Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 2 Sep 2012 23:05:15 -0700
Subject: [PATCH 195/502] trying to get the kinks out of lessons

---
 v3/lessons/dive-into-python-311.txt | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/v3/lessons/dive-into-python-311.txt b/v3/lessons/dive-into-python-311.txt
index 14d7daf73..8a0198d03 100644
--- a/v3/lessons/dive-into-python-311.txt
+++ b/v3/lessons/dive-into-python-311.txt
@@ -11,18 +11,18 @@ li.extend(["two", "elements"])
 
   "description": "This lesson was derived from Section 3.2 of Dive Into Python.",
 
-  "2": "First, you define a list of five elements. Note that they retain their original order. This is not an accident. A list is an ordered set of elements enclosed in square brackets.",
+  "1": "First, you define a list of five elements. Note that they retain their original order. This is not an accident. A list is an ordered set of elements enclosed in square brackets.",
 
-  "3": "You can get a subset of a list, called a \"slice\", by specifying two indices. The return value is a new list containing all the elements of the list, in order, starting with the first slice index (in this case li[1]), up to but not including the second slice index (in this case li[3]).",
+  "2": "You can get a subset of a list, called a \"slice\", by specifying two indices. The return value is a new list containing all the elements of the list, in order, starting with the first slice index (in this case li[1]), up to but not including the second slice index (in this case li[3]).",
 
-  "4": "Slicing works if one or both of the slice indices is negative.  If it helps, you can think of it this way: reading the list from left to right, the first slice index specifies the first element you want, and the second slice index specifies the first element you don't want.  The return value is everything in between.",
+  "3": "Slicing works if one or both of the slice indices is negative.  If it helps, you can think of it this way: reading the list from left to right, the first slice index specifies the first element you want, and the second slice index specifies the first element you don't want.  The return value is everything in between.",
 
-  "5": "Lists are zero-based, so li[0:3] returns the first three elements of the list, starting at li[0], up to but not including li[3].",
+  "4": "Lists are zero-based, so li[0:3] returns the first three elements of the list, starting at li[0], up to but not including li[3].",
 
-  "6": "append adds a single element to the end of the list.",
+  "5": "append adds a single element to the end of the list.",
 
-  "7": "insert inserts a single element into a list. The numeric argument is the index of the first element that gets bumped out of position. Note that list elements do not need to be unique; there are now two separate elements with the value 'new', li[2] and li[6].",
+  "6": "insert inserts a single element into a list. The numeric argument is the index of the first element that gets bumped out of position. Note that list elements do not need to be unique; there are now two separate elements with the value 'new', li[2] and li[6].",
 
-  "8": "extend concatenates lists. Note that you do not call extend with multiple arguments; you call it with one argument, a list. In this case, that list has two elements."
+  "7": "extend concatenates lists. Note that you do not call extend with multiple arguments; you call it with one argument, a list. In this case, that list has two elements."
 
 }

From 0e32fe0fab89d4630337b4ab3d0dadafad2f1ceb Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 2 Sep 2012 23:28:09 -0700
Subject: [PATCH 196/502] minor

---
 v3/css/pytutor.css | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 8d5f2d55b..5ce57ce84 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -408,13 +408,15 @@ div.ExecutionVisualizer div#heap {
 }
 
 div.ExecutionVisualizer td.toplevelHeapObject {
-  /* to make room for transition animations */
+  /* needed for d3 to do transitions */
   padding-left: 8px;
   padding-right: 8px;
   padding-top: 4px;
   padding-bottom: 4px;
+  /*
   border: 2px dotted white;
-  border-color: white; /* needed for d3 to do transitions */
+  border-color: white;
+  */
 }
 
 div.ExecutionVisualizer table.heapRow {

From 7e091e0ae99e8f5b613c620b71425ebb22e26a10 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 2 Sep 2012 23:32:30 -0700
Subject: [PATCH 197/502] lesson modified

---
 v3/css/opt-lessons.css              | 21 ---------------------
 v3/lesson.html                      |  3 +--
 v3/lessons/dive-into-python-311.txt | 18 ++++++++++++++----
 3 files changed, 15 insertions(+), 27 deletions(-)

diff --git a/v3/css/opt-lessons.css b/v3/css/opt-lessons.css
index 16f86b6b8..a1f71827c 100644
--- a/v3/css/opt-lessons.css
+++ b/v3/css/opt-lessons.css
@@ -1,26 +1,5 @@
 /* CSS accompanying ../lesson.html */
 
-h1 {
-  font-weight: normal;
-  font-size: 20pt;
-  font-family: georgia, serif;
-  line-height: 1em;  /* enforce single spacing so that Georgia works */
-
-  margin-top: 0px;
-  margin-bottom: 8px;
-}
-
-h2 {
-  font-size: 12pt;
-  font-weight: normal;
-  font-family: georgia, serif;
-  line-height: 1.1em; /* enforce single spacing so that Georgia works */
-
-  margin-top: 2px;
-  margin-bottom: 20px;
-}
-
-
 body {
   background-color: white;
 
diff --git a/v3/lesson.html b/v3/lesson.html
index 0c977ba1a..d26d7502a 100644
--- a/v3/lesson.html
+++ b/v3/lesson.html
@@ -55,10 +55,9 @@
   

   

 
+  

 

 
-

-
 

 

 
diff --git a/v3/lessons/dive-into-python-311.txt b/v3/lessons/dive-into-python-311.txt
index 8a0198d03..53a20d0a1 100644
--- a/v3/lessons/dive-into-python-311.txt
+++ b/v3/lessons/dive-into-python-311.txt
@@ -1,17 +1,21 @@
-li = ["a", "b", "mpilgrim", "z", "example"]
+li = ['a', 'b', 'mp', 'z', 'e']
 slice1 = li[1:3]
 slice2 = li[1:-1]
 slice3 = li[0:3]
 li.append("new")
 li.insert(2, "new")
 li.extend(["two", "elements"])
+li.remove("z")
+li.remove("new")
+li.remove("new")
+li.remove("c")
 ======
 {
   "title": "Basic List Operations",
 
   "description": "This lesson was derived from Section 3.2 of Dive Into Python.",
 
-  "1": "First, you define a list of five elements. Note that they retain their original order. This is not an accident. A list is an ordered set of elements enclosed in square brackets.",
+  "1": "First, you define a list of five elements. Note that after you execute this line, the elements retain their original order. This is not an accident. A list is an ordered set of elements enclosed in square brackets.",
 
   "2": "You can get a subset of a list, called a \"slice\", by specifying two indices. The return value is a new list containing all the elements of the list, in order, starting with the first slice index (in this case li[1]), up to but not including the second slice index (in this case li[3]).",
 
@@ -21,8 +25,14 @@ li.extend(["two", "elements"])
 
   "5": "append adds a single element to the end of the list.",
 
-  "6": "insert inserts a single element into a list. The numeric argument is the index of the first element that gets bumped out of position. Note that list elements do not need to be unique; there are now two separate elements with the value 'new', li[2] and li[6].",
+  "6": "insert inserts a single element into a list. The numeric argument is the index of the first element that gets bumped out of position. Note that list elements do not need to be unique; there will now be two separate elements with the value 'new', li[2] and li[6].",
 
-  "7": "extend concatenates lists. Note that you do not call extend with multiple arguments; you call it with one argument, a list. In this case, that list has two elements."
+  "7": "extend concatenates lists. Note that you do not call extend with multiple arguments; you call it with one argument, a list. In this case, that list has two elements.",
+
+  "8": "remove removes the first occurrence of a value from a list.",
+
+  "9": "remove removes only the first occurrence of a value. In this case, 'new' appears twice in the list, but li.remove(\"new\") will remove only the first occurrence.",
+
+  "11": "If the value is not found in the list, Python raises an exception. This mirrors the behavior of the index method."
 
 }

From 37205268d09004d50710c413b38ce5052ec77521 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 2 Sep 2012 23:41:54 -0700
Subject: [PATCH 198/502] bam

---
 v3/css/opt-lessons.css | 4 +++-
 v3/lesson.html         | 5 ++---
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/v3/css/opt-lessons.css b/v3/css/opt-lessons.css
index a1f71827c..02c07e950 100644
--- a/v3/css/opt-lessons.css
+++ b/v3/css/opt-lessons.css
@@ -15,6 +15,7 @@ body {
 
 div#lessonHeader {
   margin-bottom: 15pt;
+  width: 800px;
 }
 
 div#lessonTitle {
@@ -30,8 +31,9 @@ div#lessonDescription {
 div#lessonNarration {
   font-size: 11pt;
   min-height: 25px;
-  margin-bottom: 8px;
+  margin-bottom: 12px;
   line-height: 1.5em;
+  width: 800px;
 }
 
 
diff --git a/v3/lesson.html b/v3/lesson.html
index d26d7502a..418977396 100644
--- a/v3/lesson.html
+++ b/v3/lesson.html
@@ -51,13 +51,12 @@
 
 
 

-
   

   

-
-  

 

 
+

+
 

 

 

From e8f2f671b50a241bd8c97feebeab33269d64bd70 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 00:34:32 -0700
Subject: [PATCH 199/502] woo

---
 v3/js/opt-lessons.js    |  3 ++-
 v3/lessons/for-else.txt | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+), 1 deletion(-)
 create mode 100644 v3/lessons/for-else.txt

diff --git a/v3/js/opt-lessons.js b/v3/js/opt-lessons.js
index 6b0491d09..893edc1da 100644
--- a/v3/js/opt-lessons.js
+++ b/v3/js/opt-lessons.js
@@ -101,7 +101,8 @@ function updateLessonNarration(myViz) {
 $(document).ready(function() {
 
   //$.get("lessons/aliasing.txt", parseLessonFile);
-  $.get("lessons/dive-into-python-311.txt", parseLessonFile);
+  //$.get("lessons/dive-into-python-311.txt", parseLessonFile);
+  $.get("lessons/for-else.txt", parseLessonFile);
 
   // log a generic AJAX error handler
   $(document).ajaxError(function() {
diff --git a/v3/lessons/for-else.txt b/v3/lessons/for-else.txt
new file mode 100644
index 000000000..08502b199
--- /dev/null
+++ b/v3/lessons/for-else.txt
@@ -0,0 +1,34 @@
+primes = []
+for n in range(2, 10):
+  x_range = range(2, n)
+  for x in x_range:
+    if n % x == 0:
+      break
+  else:
+    # loop fell through without finding a factor
+    primes.append(n)
+======
+{
+  "title": "For-Else Construct",
+
+  "description": "Loop statements may have an else clause; it is executed when the loop terminates through exhaustion of the list (with for) or when the condition becomes false (with while), but not when the loop is terminated by a break statement. This is exemplified by the following loop, which searches for prime numbers. (Yes, this is the correct code. Look closely: the else clause belongs to the for loop, not the if statement.) [Source: Python.org tutorial]",
+
+  "1": "First initialize a list to hold the prime numbers found between 2 and 9 (inclusive).",
+
+  "4": "Note that this inner for loop has an associated else clause on line 7.",
+
+  "5": "The first iteration of this for loop immediately exits and jumps to the else clause because range(2, 2) is empty.",
+
+  "7": "Test whether n is divisible by x to determine primality ...",
+
+  "11": "Since the loop exits again without running a break statement, the else clause is executed.",
+
+  "16": "4 is divisible by 2, so it's not prime. The inner for loop will exit by running the break statement, so its associated else clause will not be executed.",
+
+  "19": "The program now tests whether 5 is divisible by 2, 3, or 4.",
+
+  "26": "Since 5 is prime, the inner for again exits normally, so its associated else clause will be executed.",
+
+  "59": "When the program terminates, primes contains the list of primes found between 2 and 9 (inclusive)"
+
+}

From c2cb35497e6fb9e6414cfd27ea600fa6659d458b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 09:07:13 -0700
Subject: [PATCH 200/502] changed tab size to 4 spaces to match popular coding
 conventions

---
 v3/js/opt-frontend.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index f755c8fed..22e44dc30 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -56,9 +56,9 @@ $(document).ready(function() {
   pyInputCodeMirror = CodeMirror(document.getElementById('codeInputPane'), {
     mode: 'python',
     lineNumbers: true,
-    tabSize: 2,
+    tabSize: 4,
     // convert tab into two spaces:
-    extraKeys: {Tab: function(cm) {cm.replaceSelection("  ", "end");}}
+    extraKeys: {Tab: function(cm) {cm.replaceSelection("    ", "end");}}
   });
 
   pyInputCodeMirror.setSize(null, '450px');

From d25756054915a2c1d2e859c510d82d43abdc6759 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 10:02:30 -0700
Subject: [PATCH 201/502] upgraded to latest CodeMirror and got 4-space tabs
 working

---
 v3/css/codemirror.css          |  26 +-
 v3/css/opt-frontend.css        |   3 +
 v3/css/pytutor.css             |   4 -
 v3/js/codemirror/codemirror.js | 704 +++++++++++++++++----------------
 v3/js/codemirror/python.js     |   2 +-
 v3/js/opt-frontend.js          |   3 +-
 6 files changed, 376 insertions(+), 366 deletions(-)

diff --git a/v3/css/codemirror.css b/v3/css/codemirror.css
index b8dda7541..f81d8df09 100644
--- a/v3/css/codemirror.css
+++ b/v3/css/codemirror.css
@@ -9,8 +9,7 @@
 }
 
 .CodeMirror-scroll {
-  overflow-x: auto;
-  overflow-y: hidden;
+  overflow: auto;
   height: 300px;
   /* This is needed to prevent an IE[67] bug where the scrolled content
      is visible outside of the scrolling box. */
@@ -20,13 +19,11 @@
 
 /* Vertical scrollbar */
 .CodeMirror-scrollbar {
-  float: right;
+  position: absolute;
+  right: 0; top: 0;
   overflow-x: hidden;
   overflow-y: scroll;
-
-  /* This corrects for the 1px gap introduced to the left of the scrollbar
-     by the rule for .CodeMirror-scrollbar-inner. */
-  margin-left: -1px;
+  z-index: 5;
 }
 .CodeMirror-scrollbar-inner {
   /* This needs to have a nonzero width in order for the scrollbar to appear
@@ -69,10 +66,6 @@
   white-space: pre;
   cursor: text;
 }
-.CodeMirror-lines * {
-  /* Necessary for throw-scrolling to decelerate properly on Safari. */
-  pointer-events: none;
-}
 
 .CodeMirror pre {
   -moz-border-radius: 0;
@@ -165,5 +158,16 @@ span.cm-em {font-style: italic;}
 span.cm-emstrong {font-style: italic; font-weight: bold;}
 span.cm-link {text-decoration: underline;}
 
+span.cm-invalidchar {color: #f00;}
+
 div.CodeMirror span.CodeMirror-matchingbracket {color: #0f0;}
 div.CodeMirror span.CodeMirror-nonmatchingbracket {color: #f22;}
+
+@media print {
+
+  /* Hide the cursor when printing */
+  .CodeMirror pre.CodeMirror-cursor {
+    visibility: hidden;
+  }
+
+}
diff --git a/v3/css/opt-frontend.css b/v3/css/opt-frontend.css
index 698fe4280..465b24cc3 100644
--- a/v3/css/opt-frontend.css
+++ b/v3/css/opt-frontend.css
@@ -79,3 +79,6 @@ button.bigBtn {
   margin-right: auto;
 }
 
+
+/* necessary for CodeMirror error line highlighting to work! */
+.CodeMirror .errorLine { background: #F89D99 !important; }
diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 5ce57ce84..91f0594cd 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -466,7 +466,3 @@ div.ExecutionVisualizer .ui-slider .ui-slider-handle {
   border: 1px solid #999;
 }
 
-
-/* necessary for CodeMirror line highlighting to work! */
-div.ExecutionVisualizer .CodeMirror .errorLine { background: #F89D99 !important; }
-
diff --git a/v3/js/codemirror/codemirror.js b/v3/js/codemirror/codemirror.js
index 532dd8974..ff0aa64be 100644
--- a/v3/js/codemirror/codemirror.js
+++ b/v3/js/codemirror/codemirror.js
@@ -1,11 +1,12 @@
-// CodeMirror version 2.32
+// CodeMirror version 2.33
 //
 // All functions that need access to the editor's state live inside
 // the CodeMirror function. Below that, at the bottom of the file,
 // some utilities are defined.
 
 // CodeMirror is the only global var we claim
-var CodeMirror = (function() {
+window.CodeMirror = (function() {
+  "use strict";
   // This is the function that produces an editor instance. Its
   // closure is used to store the editor state.
   function CodeMirror(place, givenOptions) {
@@ -15,38 +16,33 @@ var CodeMirror = (function() {
       if (defaults.hasOwnProperty(opt))
         options[opt] = (givenOptions && givenOptions.hasOwnProperty(opt) ? givenOptions : defaults)[opt];
 
+    var input = elt("textarea", null, null, "position: absolute; padding: 0; width: 1px; height: 1em");
+    input.setAttribute("wrap", "off"); input.setAttribute("autocorrect", "off"); input.setAttribute("autocapitalize", "off");
+    // Wraps and hides input textarea
+    var inputDiv = elt("div", [input], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
+    // The empty scrollbar content, used solely for managing the scrollbar thumb.
+    var scrollbarInner = elt("div", null, "CodeMirror-scrollbar-inner");
+    // The vertical scrollbar. Horizontal scrolling is handled by the scroller itself.
+    var scrollbar = elt("div", [scrollbarInner], "CodeMirror-scrollbar");
+    // DIVs containing the selection and the actual code
+    var lineDiv = elt("div"), selectionDiv = elt("div", null, null, "position: relative; z-index: -1");
+    // Blinky cursor, and element used to ensure cursor fits at the end of a line
+    var cursor = elt("pre", "\u00a0", "CodeMirror-cursor"), widthForcer = elt("pre", "\u00a0", "CodeMirror-cursor", "visibility: hidden");
+    // Used to measure text size
+    var measure = elt("div", null, null, "position: absolute; width: 100%; height: 0px; overflow: hidden; visibility: hidden;");
+    var lineSpace = elt("div", [measure, cursor, widthForcer, selectionDiv, lineDiv], null, "position: relative; z-index: 0");
+    var gutterText = elt("div", null, "CodeMirror-gutter-text"), gutter = elt("div", [gutterText], "CodeMirror-gutter");
+    // Moved around its parent to cover visible view
+    var mover = elt("div", [gutter, elt("div", [lineSpace], "CodeMirror-lines")], null, "position: relative");
+    // Set to the height of the text, causes scrolling
+    var sizer = elt("div", [mover], null, "position: relative");
+    // Provides scrolling
+    var scroller = elt("div", [sizer], "CodeMirror-scroll");
+    scroller.setAttribute("tabIndex", "-1");
     // The element in which the editor lives.
-    var wrapper = document.createElement("div");
-    wrapper.className = "CodeMirror" + (options.lineWrapping ? " CodeMirror-wrap" : "");
-    // This mess creates the base DOM structure for the editor.
-    wrapper.innerHTML =
-      '
' + // Wraps and hides input textarea
-        '
' +
-      '
' + // The vertical scrollbar. Horizontal scrolling is handled by the scroller itself.
-        '
' + // The empty scrollbar content, used solely for managing the scrollbar thumb.
-      '
' + // This must be before the scroll area because it's float-right.
-      '
' +
-        '
' + // Set to the height of the text, causes scrolling
-          '
' + // Moved around its parent to cover visible view
-            '
' +
-            // Provides positioning relative to (visible) text origin
-            '
' +
-              // Used to measure text size
-              '
' +
-              '
 
' + // Absolutely positioned blinky cursor
-              '' + // Used to force a width
-              '
' + // DIVs containing the selection and the actual code
-            '
';
+    var wrapper = elt("div", [inputDiv, scrollbar, scroller], "CodeMirror" + (options.lineWrapping ? " CodeMirror-wrap" : ""));
     if (place.appendChild) place.appendChild(wrapper); else place(wrapper);
-    // I've never seen more elegant code in my life.
-    var inputDiv = wrapper.firstChild, input = inputDiv.firstChild,
-        scroller = wrapper.lastChild, code = scroller.firstChild,
-        mover = code.firstChild, gutter = mover.firstChild, gutterText = gutter.firstChild,
-        lineSpace = gutter.nextSibling.firstChild, measure = lineSpace.firstChild,
-        cursor = measure.nextSibling, widthForcer = cursor.nextSibling,
-        selectionDiv = widthForcer.nextSibling, lineDiv = selectionDiv.nextSibling,
-        scrollbar = inputDiv.nextSibling, scrollbarInner = scrollbar.firstChild;
+
     themeChanged(); keyMapChanged();
     // Needed to hide big blue blinking cursor on Mobile Safari
     if (ios) input.style.width = "0px";
@@ -58,20 +54,17 @@ var CodeMirror = (function() {
     // Needed to handle Tab key in KHTML
     if (khtml) inputDiv.style.height = "1px", inputDiv.style.position = "absolute";
 
-    // Check for OS X >= 10.7. If so, we need to force a width on the scrollbar, and 
-    // make it overlap the content. (But we only do this if the scrollbar doesn't already
-    // have a natural width. If the mouse is plugged in or the user sets the system pref
-    // to always show scrollbars, the scrollbar shouldn't overlap.)
-    if (mac_geLion) {
-      scrollbar.className += (overlapScrollbars() ? " cm-sb-overlap" : " cm-sb-nonoverlap");
-    } else if (ie_lt8) {
-      // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
-      scrollbar.className += " cm-sb-ie7";
-    }
+    // Check for OS X >= 10.7. This has transparent scrollbars, so the
+    // overlaying of one scrollbar with another won't work. This is a
+    // temporary hack to simply turn off the overlay scrollbar. See
+    // issue #727.
+    if (mac_geLion) { scrollbar.style.zIndex = -2; scrollbar.style.visibility = "hidden"; }
+    // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
+    else if (ie_lt8) scrollbar.style.minWidth = "18px";
 
     // Check for problem with IE innerHTML not working when we have a
     // P (or similar) parent node.
-    try { stringWidth("x"); }
+    try { charWidth(); }
     catch (e) {
       if (e.message.match(/runtime/i))
         e = new Error("A CodeMirror inside a P-style element does not work in Internet Explorer. (innerHTML bug)");
@@ -92,7 +85,7 @@ var CodeMirror = (function() {
     var sel = {from: {line: 0, ch: 0}, to: {line: 0, ch: 0}, inverted: false};
     // Selection-related flags. shiftSelecting obviously tracks
     // whether the user is holding shift.
-    var shiftSelecting, lastClick, lastDoubleClick, lastScrollTop = 0, lastScrollLeft = 0, draggingText,
+    var shiftSelecting, lastClick, lastDoubleClick, lastScrollTop = 0, draggingText,
         overwrite = false, suppressEdits = false;
     // Variables used by startOperation/endOperation to track what
     // happened during the operation.
@@ -105,8 +98,10 @@ var CodeMirror = (function() {
     var bracketHighlighted;
     // Tracks the maximum line length so that the horizontal scrollbar
     // can be kept static when scrolling.
-    var maxLine = "", updateMaxLine = false, maxLineChanged = true;
+    var maxLine = getLine(0), updateMaxLine = false, maxLineChanged = true;
     var tabCache = {};
+    var pollingFast = false; // Ensures slowPoll doesn't cancel fastPoll
+    var goalColumn = null;
 
     // Initialize the content.
     operation(function(){setValue(options.value || ""); updateInput = false;})();
@@ -120,12 +115,13 @@ var CodeMirror = (function() {
     // which point we can't mess with it anymore. Context menu is
     // handled in onMouseDown for Gecko.
     if (!gecko) connect(scroller, "contextmenu", onContextMenu);
-    connect(scroller, "scroll", onScroll);
-    connect(scrollbar, "scroll", onScroll);
+    connect(scroller, "scroll", onScrollMain);
+    connect(scrollbar, "scroll", onScrollBar);
     connect(scrollbar, "mousedown", function() {if (focused) setTimeout(focusInput, 0);});
-    connect(scroller, "mousewheel", onMouseWheel);
-    connect(scroller, "DOMMouseScroll", onMouseWheel);
-    connect(window, "resize", function() {updateDisplay(true);});
+    var resizeHandler = connect(window, "resize", function() {
+      if (wrapper.parentNode) updateDisplay(true);
+      else resizeHandler();
+    }, true);
     connect(input, "keyup", operation(onKeyUp));
     connect(input, "input", fastPoll);
     connect(input, "keydown", operation(onKeyDown));
@@ -133,12 +129,12 @@ var CodeMirror = (function() {
     connect(input, "focus", onFocus);
     connect(input, "blur", onBlur);
 
+    function drag_(e) {
+      if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;
+      e_stop(e);
+    }
     if (options.dragDrop) {
       connect(scroller, "dragstart", onDragStart);
-      function drag_(e) {
-        if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;
-        e_stop(e);
-      }
       connect(scroller, "dragenter", drag_);
       connect(scroller, "dragover", drag_);
       connect(scroller, "drop", operation(onDrop));
@@ -150,7 +146,7 @@ var CodeMirror = (function() {
     }));
 
     // Needed to handle Tab key in KHTML
-    if (khtml) connect(code, "mouseup", function() {
+    if (khtml) connect(sizer, "mouseup", function() {
         if (document.activeElement == input) input.blur();
         focusInput();
     });
@@ -183,7 +179,8 @@ var CodeMirror = (function() {
         else if (option == "lineWrapping" && oldVal != value) operation(wrappingChanged)();
         else if (option == "tabSize") updateDisplay(true);
         else if (option == "keyMap") keyMapChanged();
-        if (option == "lineNumbers" || option == "gutter" || option == "firstLineNumber" || option == "theme") {
+        if (option == "lineNumbers" || option == "gutter" || option == "firstLineNumber" ||
+            option == "theme" || option == "lineNumberFormatter") {
           gutterChanged();
           updateDisplay(true);
         }
@@ -213,7 +210,7 @@ var CodeMirror = (function() {
       matchBrackets: operation(function(){matchBrackets(true);}),
       getTokenAt: operation(function(pos) {
         pos = clipPos(pos);
-        return getLine(pos.line).getTokenAt(mode, getStateBefore(pos.line), pos.ch);
+        return getLine(pos.line).getTokenAt(mode, getStateBefore(pos.line), options.tabSize, pos.ch);
       }),
       getStateAfter: function(line) {
         line = clipLine(line == null ? doc.size - 1: line);
@@ -250,15 +247,16 @@ var CodeMirror = (function() {
         return line;
       },
       lineInfo: lineInfo,
+      getViewport: function() { return {from: showingFrom, to: showingTo};},
       addWidget: function(pos, node, scroll, vert, horiz) {
         pos = localCoords(clipPos(pos));
         var top = pos.yBot, left = pos.x;
         node.style.position = "absolute";
-        code.appendChild(node);
+        sizer.appendChild(node);
         if (vert == "over") top = pos.y;
         else if (vert == "near") {
           var vspace = Math.max(scroller.offsetHeight, doc.height * textHeight()),
-              hspace = Math.max(code.clientWidth, lineSpace.clientWidth) - paddingLeft();
+              hspace = Math.max(sizer.clientWidth, lineSpace.clientWidth) - paddingLeft();
           if (pos.yBot + node.offsetHeight > vspace && pos.y > node.offsetHeight)
             top = pos.y - node.offsetHeight;
           if (left + node.offsetWidth > hspace)
@@ -267,11 +265,11 @@ var CodeMirror = (function() {
         node.style.top = (top + paddingTop()) + "px";
         node.style.left = node.style.right = "";
         if (horiz == "right") {
-          left = code.clientWidth - node.offsetWidth;
+          left = sizer.clientWidth - node.offsetWidth;
           node.style.right = "0px";
         } else {
           if (horiz == "left") left = 0;
-          else if (horiz == "middle") left = (code.clientWidth - node.offsetWidth) / 2;
+          else if (horiz == "middle") left = (sizer.clientWidth - node.offsetWidth) / 2;
           node.style.left = (left + paddingLeft()) + "px";
         }
         if (scroll)
@@ -339,7 +337,7 @@ var CodeMirror = (function() {
       },
       scrollTo: function(x, y) {
         if (x != null) scroller.scrollLeft = x;
-        if (y != null) scrollbar.scrollTop = y;
+        if (y != null) scrollbar.scrollTop = scroller.scrollTop = y;
         updateDisplay([]);
       },
       getScrollInfo: function() {
@@ -353,6 +351,7 @@ var CodeMirror = (function() {
         }
         if (width != null) wrapper.style.width = interpret(width);
         if (height != null) scroller.style.height = interpret(height);
+        instance.refresh();
       },
 
       operation: function(f){return operation(f)();},
@@ -387,25 +386,30 @@ var CodeMirror = (function() {
       return text.join(lineSep || "\n");
     }
 
-    function onScroll(e) {
-      if (scroller.scrollTop) {
-        scrollbar.scrollTop += scroller.scrollTop;
-        scroller.scrollTop = 0;
+    function onScrollBar(e) {
+      if (scrollbar.scrollTop != lastScrollTop) {
+        lastScrollTop = scroller.scrollTop = scrollbar.scrollTop;
+        updateDisplay([]);
       }
-      if (lastScrollTop != scrollbar.scrollTop || lastScrollLeft != scroller.scrollLeft) {
-        lastScrollTop = scrollbar.scrollTop;
-        lastScrollLeft = scroller.scrollLeft;
+    }
+
+    function onScrollMain(e) {
+      if (options.fixedGutter && gutter.style.left != scroller.scrollLeft + "px")
+        gutter.style.left = scroller.scrollLeft + "px";
+      if (scroller.scrollTop != lastScrollTop) {
+        lastScrollTop = scroller.scrollTop;
+        if (scrollbar.scrollTop != lastScrollTop)
+          scrollbar.scrollTop = lastScrollTop;
         updateDisplay([]);
-        if (options.fixedGutter) gutter.style.left = scroller.scrollLeft + "px";
-        if (options.onScroll) options.onScroll(instance);
       }
+      if (options.onScroll) options.onScroll(instance);
     }
 
     function onMouseDown(e) {
       setShift(e_prop(e, "shiftKey"));
       // Check whether this is a click in a widget
       for (var n = e_target(e); n != wrapper; n = n.parentNode)
-        if (n.parentNode == code && n != mover) return;
+        if (n.parentNode == sizer && n != mover) return;
 
       // See if this is a click in the gutter
       for (var n = e_target(e); n != wrapper; n = n.parentNode)
@@ -448,21 +452,21 @@ var CodeMirror = (function() {
         setSelectionUser(word.from, word.to);
       } else { lastClick = {time: now, pos: start}; }
 
+      function dragEnd(e2) {
+        if (webkit) scroller.draggable = false;
+        draggingText = false;
+        up(); drop();
+        if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) {
+          e_preventDefault(e2);
+          setCursor(start.line, start.ch, true);
+          focusInput();
+        }
+      }
       var last = start, going;
       if (options.dragDrop && dragAndDrop && !options.readOnly && !posEq(sel.from, sel.to) &&
           !posLess(start, sel.from) && !posLess(sel.to, start) && type == "single") {
         // Let the drag handler handle this.
         if (webkit) scroller.draggable = true;
-        function dragEnd(e2) {
-          if (webkit) scroller.draggable = false;
-          draggingText = false;
-          up(); drop();
-          if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) {
-            e_preventDefault(e2);
-            setCursor(start.line, start.ch, true);
-            focusInput();
-          }
-        }
         var up = connect(document, "mouseup", operation(dragEnd), true);
         var drop = connect(scroller, "drop", operation(dragEnd), true);
         draggingText = true;
@@ -525,11 +529,12 @@ var CodeMirror = (function() {
     }
     function onDrop(e) {
       if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;
-      e.preventDefault();
+      e_preventDefault(e);
       var pos = posFromMouse(e, true), files = e.dataTransfer.files;
       if (!pos || options.readOnly) return;
       if (files && files.length && window.FileReader && window.File) {
-        function loadFile(file, i) {
+        var n = files.length, text = Array(n), read = 0;
+        var loadFile = function(file, i) {
           var reader = new FileReader;
           reader.onload = function() {
             text[i] = reader.result;
@@ -542,8 +547,7 @@ var CodeMirror = (function() {
             }
           };
           reader.readAsText(file);
-        }
-        var n = files.length, text = Array(n), read = 0;
+        };
         for (var i = 0; i < n; ++i) loadFile(files[i], i);
       } else {
         // Don't do a replace if the drop happened inside of the selected text.
@@ -566,10 +570,10 @@ var CodeMirror = (function() {
     function onDragStart(e) {
       var txt = getSelection();
       e.dataTransfer.setData("Text", txt);
-      
+
       // Use dummy image instead of default browsers image.
       if (gecko || chrome || opera) {
-        var img = document.createElement('img');
+        var img = elt('img');
         img.scr = 'data:image/gif;base64,R0lGODdhAgACAIAAAAAAAP///ywAAAAAAgACAAACAoRRADs='; //1x1 image
         e.dataTransfer.setDragImage(img, 0, 0);
       }
@@ -594,6 +598,7 @@ var CodeMirror = (function() {
       }
       return true;
     }
+    var maybeTransition;
     function handleKeyBinding(e) {
       // Handle auto keymap transitions
       var startMap = getKeyMap(options.keyMap), next = startMap.auto;
@@ -640,7 +645,7 @@ var CodeMirror = (function() {
       return handled;
     }
 
-    var lastStoppedKey = null, maybeTransition;
+    var lastStoppedKey = null;
     function onKeyDown(e) {
       if (!focused) onFocus();
       if (ie && e.keyCode == 27) { e.returnValue = false; }
@@ -703,42 +708,6 @@ var CodeMirror = (function() {
       setTimeout(function() {if (!focused) shiftSelecting = null;}, 150);
     }
 
-    function chopDelta(delta) {
-      // Make sure we always scroll a little bit for any nonzero delta.
-      if (delta > 0.0 && delta < 1.0) return 1;
-      else if (delta > -1.0 && delta < 0.0) return -1;
-      else return Math.round(delta);
-    }
-
-    function onMouseWheel(e) {
-      var deltaX = 0, deltaY = 0;
-      if (e.type == "DOMMouseScroll") { // Firefox
-        var delta = -e.detail * 8.0;
-        if (e.axis == e.HORIZONTAL_AXIS) deltaX = delta;
-        else if (e.axis == e.VERTICAL_AXIS) deltaY = delta;
-      } else if (e.wheelDeltaX !== undefined && e.wheelDeltaY !== undefined) { // WebKit
-        deltaX = e.wheelDeltaX / 3.0;
-        deltaY = e.wheelDeltaY / 3.0;
-      } else if (e.wheelDelta !== undefined) { // IE or Opera
-        deltaY = e.wheelDelta / 3.0;
-      }
-
-      var scrolled = false;
-      deltaX = chopDelta(deltaX);
-      deltaY = chopDelta(deltaY);
-      if ((deltaX > 0 && scroller.scrollLeft > 0) ||
-          (deltaX < 0 && scroller.scrollLeft + scroller.clientWidth < scroller.scrollWidth)) {
-        scroller.scrollLeft -= deltaX;
-        scrolled = true;
-      }
-      if ((deltaY > 0 && scrollbar.scrollTop > 0) ||
-          (deltaY < 0 && scrollbar.scrollTop + scrollbar.clientHeight < scrollbar.scrollHeight)) {
-        scrollbar.scrollTop -= deltaY;
-        scrolled = true;
-      }
-      if (scrolled) e_stop(e);
-    }
-
     // Replace the range from from to to by the strings in newText.
     // Afterwards, set the selection to selFrom, selTo.
     function updateLines(from, to, newText, selFrom, selTo) {
@@ -771,7 +740,7 @@ var CodeMirror = (function() {
 
     function updateLinesNoUndo(from, to, newText, selFrom, selTo) {
       if (suppressEdits) return;
-      var recomputeMaxLength = false, maxLineLength = maxLine.length;
+      var recomputeMaxLength = false, maxLineLength = maxLine.text.length;
       if (!options.lineWrapping)
         doc.iter(from.line, to.line + 1, function(line) {
           if (!line.hidden && line.text.length == maxLineLength) {recomputeMaxLength = true; return true;}
@@ -831,7 +800,7 @@ var CodeMirror = (function() {
         doc.iter(from.line, from.line + newText.length, function(line) {
           var l = line.text;
           if (!line.hidden && l.length > maxLineLength) {
-            maxLine = l; maxLineLength = l.length; maxLineChanged = true;
+            maxLine = line; maxLineLength = l.length; maxLineChanged = true;
             recomputeMaxLength = false;
           }
         });
@@ -867,46 +836,43 @@ var CodeMirror = (function() {
 
     function needsScrollbar() {
       var realHeight = doc.height * textHeight() + 2 * paddingTop();
-      return realHeight - 1 > scroller.offsetHeight ? realHeight : false;
+      return realHeight * .99 > scroller.offsetHeight ? realHeight : false;
     }
 
     function updateVerticalScroll(scrollTop) {
       var scrollHeight = needsScrollbar();
       scrollbar.style.display = scrollHeight ? "block" : "none";
       if (scrollHeight) {
-        scrollbarInner.style.height = scrollHeight + "px";
-        scrollbar.style.height = scroller.offsetHeight + "px";
-        if (scrollTop != null) scrollbar.scrollTop = scrollTop;
+        scrollbarInner.style.height = sizer.style.minHeight = scrollHeight + "px";
+        scrollbar.style.height = scroller.clientHeight + "px";
+        if (scrollTop != null) {
+          scrollbar.scrollTop = scroller.scrollTop = scrollTop;
+          // 'Nudge' the scrollbar to work around a Webkit bug where,
+          // in some situations, we'd end up with a scrollbar that
+          // reported its scrollTop (and looked) as expected, but
+          // *behaved* as if it was still in a previous state (i.e.
+          // couldn't scroll up, even though it appeared to be at the
+          // bottom).
+          if (webkit) setTimeout(function() {
+            if (scrollbar.scrollTop != scrollTop) return;
+            scrollbar.scrollTop = scrollTop + (scrollTop ? -1 : 1);
+            scrollbar.scrollTop = scrollTop;
+          }, 0);
+        }
+      } else {
+        sizer.style.minHeight = "";
       }
       // Position the mover div to align with the current virtual scroll position
-      mover.style.top = (displayOffset * textHeight() - scrollbar.scrollTop) + "px";
-    }
-  
-    // On Mac OS X Lion and up, detect whether the mouse is plugged in by measuring 
-    // the width of a div with a scrollbar in it. If the width is <= 1, then
-    // the mouse isn't plugged in and scrollbars should overlap the content.
-    function overlapScrollbars() {
-      var tmpSb = document.createElement('div'),
-          tmpSbInner = document.createElement('div');
-      tmpSb.className = "CodeMirror-scrollbar";
-      tmpSb.style.cssText = "position: absolute; left: -9999px; height: 100px;";
-      tmpSbInner.className = "CodeMirror-scrollbar-inner";
-      tmpSbInner.style.height = "200px";
-      tmpSb.appendChild(tmpSbInner);
-
-      document.body.appendChild(tmpSb);
-      var result = (tmpSb.offsetWidth <= 1);
-      document.body.removeChild(tmpSb);
-      return result;
+      mover.style.top = displayOffset * textHeight() + "px";
     }
 
     function computeMaxLength() {
-      var maxLineLength = 0; 
-      maxLine = ""; maxLineChanged = true;
-      doc.iter(0, doc.size, function(line) {
+      maxLine = getLine(0); maxLineChanged = true;
+      var maxLineLength = maxLine.text.length;
+      doc.iter(1, doc.size, function(line) {
         var l = line.text;
         if (!line.hidden && l.length > maxLineLength) {
-          maxLineLength = l.length; maxLine = l;
+          maxLineLength = l.length; maxLine = line;
         }
       });
       updateMaxLine = false;
@@ -957,7 +923,6 @@ var CodeMirror = (function() {
       return getRange(sel.from, sel.to, lineSep);
     }
 
-    var pollingFast = false; // Ensures slowPoll doesn't cancel fastPoll
     function slowPoll() {
       if (pollingFast) return;
       poll.set(options.pollInterval, function() {
@@ -1006,7 +971,7 @@ var CodeMirror = (function() {
       if (!posEq(sel.from, sel.to)) {
         prevInput = "";
         input.value = getSelection();
-        selectInput(input);
+        if (focused) selectInput(input);
       } else if (user) prevInput = input.value = "";
     }
 
@@ -1014,16 +979,23 @@ var CodeMirror = (function() {
       if (options.readOnly != "nocursor") input.focus();
     }
 
-    function scrollEditorIntoView() {
-      var rect = cursor.getBoundingClientRect();
-      // IE returns bogus coordinates when the instance sits inside of an iframe and the cursor is hidden
-      if (ie && rect.top == rect.bottom) return;
-      var winH = window.innerHeight || Math.max(document.body.offsetHeight, document.documentElement.offsetHeight);
-      if (rect.top < 0 || rect.bottom > winH) scrollCursorIntoView();
-    }
     function scrollCursorIntoView() {
       var coords = calculateCursorCoords();
-      return scrollIntoView(coords.x, coords.y, coords.x, coords.yBot);
+      scrollIntoView(coords.x, coords.y, coords.x, coords.yBot);
+      if (!focused) return;
+      var box = sizer.getBoundingClientRect(), doScroll = null;
+      if (coords.y + box.top < 0) doScroll = true;
+      else if (coords.y + box.top + textHeight() > (window.innerHeight || document.documentElement.clientHeight)) doScroll = false;
+      if (doScroll != null) {
+        var hidden = cursor.style.display == "none";
+        if (hidden) {
+          cursor.style.display = "";
+          cursor.style.left = coords.x + "px";
+          cursor.style.top = (coords.y - displayOffset) + "px";
+        }
+        cursor.scrollIntoView(doScroll);
+        if (hidden) cursor.style.display = "none";
+      }
     }
     function calculateCursorCoords() {
       var cursor = localCoords(sel.inverted ? sel.from : sel.to);
@@ -1031,17 +1003,16 @@ var CodeMirror = (function() {
       return {x: x, y: cursor.y, yBot: cursor.yBot};
     }
     function scrollIntoView(x1, y1, x2, y2) {
-      var scrollPos = calculateScrollPos(x1, y1, x2, y2), scrolled = false;
-      if (scrollPos.scrollLeft != null) {scroller.scrollLeft = scrollPos.scrollLeft; scrolled = true;}
-      if (scrollPos.scrollTop != null) {scrollbar.scrollTop = scrollPos.scrollTop; scrolled = true;}
-      if (scrolled && options.onScroll) options.onScroll(instance);
+      var scrollPos = calculateScrollPos(x1, y1, x2, y2);
+      if (scrollPos.scrollLeft != null) {scroller.scrollLeft = scrollPos.scrollLeft;}
+      if (scrollPos.scrollTop != null) {scrollbar.scrollTop = scroller.scrollTop = scrollPos.scrollTop;}
     }
     function calculateScrollPos(x1, y1, x2, y2) {
       var pl = paddingLeft(), pt = paddingTop();
       y1 += pt; y2 += pt; x1 += pl; x2 += pl;
       var screen = scroller.clientHeight, screentop = scrollbar.scrollTop, result = {};
-      var docBottom = scroller.scrollHeight;
-      var atTop = y1 < pt + 10, atBottom = y2 + pt > docBottom - 10;;
+      var docBottom = needsScrollbar() || Infinity;
+      var atTop = y1 < pt + 10, atBottom = y2 + pt > docBottom - 10;
       if (y1 < screentop) result.scrollTop = atTop ? 0 : Math.max(0, y1);
       else if (y2 > screentop + screen) result.scrollTop = (atBottom ? docBottom : y2) - screen;
 
@@ -1113,6 +1084,10 @@ var CodeMirror = (function() {
       // This is just a bogus formula that detects when the editor is
       // resized or the font size changes.
       if (different) lastSizeC = scroller.clientHeight + th;
+      if (from != showingFrom || to != showingTo && options.onViewportChange)
+        setTimeout(function(){
+          if (options.onViewportChange) options.onViewportChange(instance, from, to);
+        });
       showingFrom = from; showingTo = to;
       displayOffset = heightAtLine(doc, from);
 
@@ -1125,6 +1100,10 @@ var CodeMirror = (function() {
       function checkHeights() {
         var curNode = lineDiv.firstChild, heightChanged = false;
         doc.iter(showingFrom, showingTo, function(line) {
+          // Work around bizarro IE7 bug where, sometimes, our curNode
+          // is magically replaced with a new node in the DOM, leaving
+          // us with a reference to an orphan (nextSibling-less) node.
+          if (!curNode) return;
           if (!line.hidden) {
             var height = Math.round(curNode.offsetHeight / th) || 1;
             if (line.height != height) {
@@ -1137,16 +1116,7 @@ var CodeMirror = (function() {
         return heightChanged;
       }
 
-      if (options.lineWrapping) {
-        checkHeights();
-        var scrollHeight = needsScrollbar();
-        var shouldHaveScrollbar = scrollHeight ? "block" : "none";
-        if (scrollbar.style.display != shouldHaveScrollbar) {
-          scrollbar.style.display = shouldHaveScrollbar;
-          if (scrollHeight) scrollbarInner.style.height = scrollHeight + "px";
-          checkHeights();
-        }
-      }
+      if (options.lineWrapping) checkHeights();
 
       gutter.style.display = gutterDisplay;
       if (different || gutterDirty) {
@@ -1183,14 +1153,14 @@ var CodeMirror = (function() {
     }
 
     function patchDisplay(from, to, intact) {
+      function killNode(node) {
+        var tmp = node.nextSibling;
+        node.parentNode.removeChild(node);
+        return tmp;
+      }
       // The first pass removes the DOM nodes that aren't intact.
-      if (!intact.length) lineDiv.innerHTML = "";
+      if (!intact.length) removeChildren(lineDiv);
       else {
-        function killNode(node) {
-          var tmp = node.nextSibling;
-          node.parentNode.removeChild(node);
-          return tmp;
-        }
         var domPos = 0, curNode = lineDiv.firstChild, n;
         for (var i = 0; i < intact.length; ++i) {
           var cur = intact[i];
@@ -1201,21 +1171,20 @@ var CodeMirror = (function() {
       }
       // This pass fills in the lines that actually changed.
       var nextIntact = intact.shift(), curNode = lineDiv.firstChild, j = from;
-      var scratch = document.createElement("div");
       doc.iter(from, to, function(line) {
         if (nextIntact && nextIntact.to == j) nextIntact = intact.shift();
         if (!nextIntact || nextIntact.from > j) {
-          if (line.hidden) var html = scratch.innerHTML = "
";
+          if (line.hidden) var lineElement = elt("pre");
           else {
-            var html = ''
-              + line.getHTML(makeTab) + '
';
+            var lineElement = line.getElement(makeTab);
+            if (line.className) lineElement.className = line.className;
             // Kludge to make sure the styled element lies behind the selection (by z-index)
-            if (line.bgClassName)
-              html = '
 
' + html + "
";
+            if (line.bgClassName) {
+              var pre = elt("pre", "\u00a0", line.bgClassName, "position: absolute; left: 0; right: 0; top: 0; bottom: 0; z-index: -2");
+              lineElement = elt("div", [pre, lineElement], null, "position: relative");
+            }
           }
-          scratch.innerHTML = html;
-          lineDiv.insertBefore(scratch.firstChild, curNode);
+          lineDiv.insertBefore(lineElement, curNode);
         } else {
           curNode = curNode.nextSibling;
         }
@@ -1227,10 +1196,10 @@ var CodeMirror = (function() {
       if (!options.gutter && !options.lineNumbers) return;
       var hText = mover.offsetHeight, hEditor = scroller.clientHeight;
       gutter.style.height = (hText - hEditor < 2 ? hEditor : hText) + "px";
-      var html = [], i = showingFrom, normalNode;
+      var fragment = document.createDocumentFragment(), i = showingFrom, normalNode;
       doc.iter(showingFrom, Math.max(showingTo, showingFrom + 1), function(line) {
         if (line.hidden) {
-          html.push("
");
+          fragment.appendChild(elt("pre"));
         } else {
           var marker = line.gutterMarker;
           var text = options.lineNumbers ? options.lineNumberFormatter(i + options.firstLineNumber) : null;
@@ -1238,15 +1207,18 @@ var CodeMirror = (function() {
             text = marker.text.replace("%N%", text != null ? text : "");
           else if (text == null)
             text = "\u00a0";
-          html.push((marker && marker.style ? '
' : "
"), text);
-          for (var j = 1; j < line.height; ++j) html.push("
 ");
-          html.push("
");
+          var markerElement = fragment.appendChild(elt("pre", null, marker && marker.style));
+          markerElement.innerHTML = text;
+          for (var j = 1; j < line.height; ++j) {
+            markerElement.appendChild(elt("br"));
+            markerElement.appendChild(document.createTextNode("\u00a0"));
+          }
           if (!marker) normalNode = i;
         }
         ++i;
       });
       gutter.style.display = "none";
-      gutterText.innerHTML = html.join("");
+      removeChildrenAndAdd(gutterText, fragment);
       // Make sure scrolling doesn't cause number gutter size to pop
       if (normalNode != null && options.lineNumbers) {
         var node = gutterText.childNodes[normalNode - showingFrom];
@@ -1274,15 +1246,15 @@ var CodeMirror = (function() {
         cursor.style.display = "";
         selectionDiv.style.display = "none";
       } else {
-        var sameLine = fromPos.y == toPos.y, html = "";
+        var sameLine = fromPos.y == toPos.y, fragment = document.createDocumentFragment();
         var clientWidth = lineSpace.clientWidth || lineSpace.offsetWidth;
         var clientHeight = lineSpace.clientHeight || lineSpace.offsetHeight;
-        function add(left, top, right, height) {
+        var add = function(left, top, right, height) {
           var rstyle = quirksMode ? "width: " + (!right ? clientWidth : clientWidth - right - left) + "px"
                                   : "right: " + right + "px";
-          html += '
';
-        }
+          fragment.appendChild(elt("div", null, "CodeMirror-selected", "position: absolute; left: " + left +
+                                   "px; top: " + top + "px; " + rstyle + "; height: " + height + "px"));
+        };
         if (sel.from.ch && fromPos.y >= 0) {
           var right = sameLine ? clientWidth - toPos.x : 0;
           add(fromPos.x, fromPos.y, right, th);
@@ -1293,7 +1265,7 @@ var CodeMirror = (function() {
           add(0, middleStart, 0, middleHeight);
         if ((!sameLine || !sel.from.ch) && toPos.y < clientHeight - .5 * th)
           add(0, toPos.y, clientWidth - toPos.x, th);
-        selectionDiv.innerHTML = html;
+        removeChildrenAndAdd(selectionDiv, fragment);
         cursor.style.display = "none";
         selectionDiv.style.display = "";
       }
@@ -1425,13 +1397,16 @@ var CodeMirror = (function() {
       else replaceRange("", sel.from, findPosH(dir, unit));
       userSelChange = true;
     }
-    var goalColumn = null;
     function moveV(dir, unit) {
       var dist = 0, pos = localCoords(sel.inverted ? sel.from : sel.to, true);
       if (goalColumn != null) pos.x = goalColumn;
-      if (unit == "page") dist = Math.min(scroller.clientHeight, window.innerHeight || document.documentElement.clientHeight);
-      else if (unit == "line") dist = textHeight();
-      var target = coordsChar(pos.x, pos.y + dist * dir + 2);
+      if (unit == "page") {
+        var screen = Math.min(scroller.clientHeight, window.innerHeight || document.documentElement.clientHeight);
+        var target = coordsChar(pos.x, pos.y + screen * dir);
+      } else if (unit == "line") {
+        var th = textHeight();
+        var target = coordsChar(pos.x, pos.y + .5 * th + dir * th);
+      }
       if (unit == "page") scrollbar.scrollTop += localCoords(target, true).y - pos.y;
       setCursor(target.line, target.ch, true);
       goalColumn = pos.x;
@@ -1440,10 +1415,15 @@ var CodeMirror = (function() {
     function findWordAt(pos) {
       var line = getLine(pos.line).text;
       var start = pos.ch, end = pos.ch;
-      var check = isWordChar(line.charAt(start < line.length ? start : start - 1)) ?
-        isWordChar : function(ch) {return !isWordChar(ch);};
-      while (start > 0 && check(line.charAt(start - 1))) --start;
-      while (end < line.length && check(line.charAt(end))) ++end;
+      if (line) {
+        if (pos.after === false || end == line.length) --start; else ++end;
+        var startChar = line.charAt(start);
+        var check = isWordChar(startChar) ? isWordChar :
+                    /\s/.test(startChar) ? function(ch) {return /\s/.test(ch);} :
+                    function(ch) {return !/\s/.test(ch) && !isWordChar(ch);};
+        while (start > 0 && check(line.charAt(start - 1))) --start;
+        while (end < line.length && check(line.charAt(end))) ++end;
+      }
       return {from: {line: pos.line, ch: start}, to: {line: pos.line, ch: end}};
     }
     function selectLine(line) {
@@ -1482,7 +1462,8 @@ var CodeMirror = (function() {
         for (var i = Math.floor(indentation / options.tabSize); i; --i) {pos += options.tabSize; indentString += "\t";}
       while (pos < indentation) {++pos; indentString += " ";}
 
-      replaceRange(indentString, {line: n, ch: 0}, {line: n, ch: curSpaceString.length});
+      if (indentString != curSpaceString)
+        replaceRange(indentString, {line: n, ch: 0}, {line: n, ch: curSpaceString.length});
     }
 
     function loadMode() {
@@ -1506,14 +1487,12 @@ var CodeMirror = (function() {
           var guess = Math.ceil(line.text.length / perLine) || 1;
           if (guess != 1) updateLineHeight(line, guess);
         });
-        lineSpace.style.width = code.style.width = "";
-        widthForcer.style.left = "";
+        lineSpace.style.minWidth = widthForcer.style.left = "";
       } else {
         wrapper.className = wrapper.className.replace(" CodeMirror-wrap", "");
-        maxLine = ""; maxLineChanged = true;
+        computeMaxLength();
         doc.iter(0, doc.size, function(line) {
           if (line.height != 1 && !line.hidden) updateLineHeight(line, 1);
-          if (line.text.length > maxLine.length) maxLine = line.text;
         });
       }
       changes.push({from: 0, to: doc.size});
@@ -1521,8 +1500,9 @@ var CodeMirror = (function() {
     function makeTab(col) {
       var w = options.tabSize - col % options.tabSize, cached = tabCache[w];
       if (cached) return cached;
-      for (var str = '', i = 0; i < w; ++i) str += " ";
-      return (tabCache[w] = {html: str + "", width: w});
+      for (var str = "", i = 0; i < w; ++i) str += " ";
+      var span = elt("span", str, "cm-tab");
+      return (tabCache[w] = {element: span, width: w});
     }
     function themeChanged() {
       scroller.className = scroller.className.replace(/\s*cm-s-\S+/g, "") +
@@ -1641,11 +1621,10 @@ var CodeMirror = (function() {
         if (line.hidden != hidden) {
           line.hidden = hidden;
           if (!options.lineWrapping) {
-            var l = line.text;
-            if (hidden && l.length == maxLine.length) {
+            if (hidden && line.text.length == maxLine.text.length) {
               updateMaxLine = true;
-            } else if (!hidden && l.length > maxLine.length) {
-              maxLine = l; updateMaxLine = false;
+            } else if (!hidden && line.text.length > maxLine.text.length) {
+              maxLine = line; updateMaxLine = false;
             }
           }
           updateLineHeight(line, hidden ? 0 : 1);
@@ -1677,11 +1656,6 @@ var CodeMirror = (function() {
               markerClass: marker && marker.style, lineClass: line.className, bgClass: line.bgClassName};
     }
 
-    function stringWidth(str) {
-      measure.innerHTML = "
x
";
-      measure.firstChild.firstChild.firstChild.nodeValue = str;
-      return measure.firstChild.firstChild.offsetWidth || 10;
-    }
     // These are used to go from pixel positions to character
     // positions, taking varying character widths into account.
     function charFromX(line, x) {
@@ -1711,19 +1685,18 @@ var CodeMirror = (function() {
       }
     }
 
-    var tempId = "CodeMirror-temp-" + Math.floor(Math.random() * 0xffffff).toString(16);
     function measureLine(line, ch) {
       if (ch == 0) return {top: 0, left: 0};
       var wbr = options.lineWrapping && ch < line.text.length &&
                 spanAffectsWrapping.test(line.text.slice(ch - 1, ch + 1));
-      measure.innerHTML = "
" + line.getHTML(makeTab, ch, tempId, wbr) + "
";
-      var elt = document.getElementById(tempId);
-      var top = elt.offsetTop, left = elt.offsetLeft;
+      var pre = line.getElement(makeTab, ch, wbr);
+      removeChildrenAndAdd(measure, pre);
+      var anchor = pre.anchor;
+      var top = anchor.offsetTop, left = anchor.offsetLeft;
       // Older IEs report zero offsets for spans directly after a wrap
       if (ie && top == 0 && left == 0) {
-        var backup = document.createElement("span");
-        backup.innerHTML = "x";
-        elt.parentNode.insertBefore(backup, elt.nextSibling);
+        var backup = elt("span", "x");
+        anchor.parentNode.insertBefore(backup, anchor.nextSibling);
         top = backup.offsetTop;
       }
       return {top: top, left: left};
@@ -1740,17 +1713,19 @@ var CodeMirror = (function() {
     }
     // Coords must be lineSpace-local
     function coordsChar(x, y) {
-      if (y < 0) y = 0;
       var th = textHeight(), cw = charWidth(), heightPos = displayOffset + Math.floor(y / th);
+      if (heightPos < 0) return {line: 0, ch: 0};
       var lineNo = lineAtHeight(doc, heightPos);
       if (lineNo >= doc.size) return {line: doc.size - 1, ch: getLine(doc.size - 1).text.length};
       var lineObj = getLine(lineNo), text = lineObj.text;
       var tw = options.lineWrapping, innerOff = tw ? heightPos - heightAtLine(doc, lineNo) : 0;
       if (x <= 0 && innerOff == 0) return {line: lineNo, ch: 0};
+      var wrongLine = false;
       function getX(len) {
         var sp = measureLine(lineObj, len);
         if (tw) {
           var off = Math.round(sp.top / th);
+          wrongLine = off != innerOff;
           return Math.max(0, sp.left + (off - innerOff) * scroller.clientWidth);
         }
         return sp.left;
@@ -1769,9 +1744,12 @@ var CodeMirror = (function() {
       if (estX < x) {from = estimated; fromX = estX;}
       // Do a binary search between these bounds.
       for (;;) {
-        if (to - from <= 1) return {line: lineNo, ch: (toX - x > x - fromX) ? from : to};
+        if (to - from <= 1) {
+          var after = x - fromX < toX - x;
+          return {line: lineNo, ch: after ? from : to, after: after};
+        }
         var middle = Math.ceil((from + to) / 2), middleX = getX(middle);
-        if (middleX > x) {to = middle; toX = middleX;}
+        if (middleX > x) {to = middle; toX = middleX; if (wrongLine) toX += 1000; }
         else {from = middle; fromX = middleX;}
       }
     }
@@ -1780,26 +1758,32 @@ var CodeMirror = (function() {
       return {x: off.left + local.x, y: off.top + local.y, yBot: off.top + local.yBot};
     }
 
-    var cachedHeight, cachedHeightFor, measureText;
+    var cachedHeight, cachedHeightFor, measurePre;
     function textHeight() {
-      if (measureText == null) {
-        measureText = "
";
-        for (var i = 0; i < 49; ++i) measureText += "x
";
-        measureText += "x
";
+      if (measurePre == null) {
+        measurePre = elt("pre");
+        for (var i = 0; i < 49; ++i) {
+          measurePre.appendChild(document.createTextNode("x"));
+          measurePre.appendChild(elt("br"));
+        }
+        measurePre.appendChild(document.createTextNode("x"));
       }
       var offsetHeight = lineDiv.clientHeight;
       if (offsetHeight == cachedHeightFor) return cachedHeight;
       cachedHeightFor = offsetHeight;
-      measure.innerHTML = measureText;
+      removeChildrenAndAdd(measure, measurePre.cloneNode(true));
       cachedHeight = measure.firstChild.offsetHeight / 50 || 1;
-      measure.innerHTML = "";
+      removeChildren(measure);
       return cachedHeight;
     }
     var cachedWidth, cachedWidthFor = 0;
     function charWidth() {
       if (scroller.clientWidth == cachedWidthFor) return cachedWidth;
       cachedWidthFor = scroller.clientWidth;
-      return (cachedWidth = stringWidth("x"));
+      var anchor = elt("span", "x");
+      var pre = elt("pre", [anchor]);
+      removeChildrenAndAdd(measure, pre);
+      return (cachedWidth = anchor.offsetWidth || 10);
     }
     function paddingTop() {return lineSpace.offsetTop;}
     function paddingLeft() {return lineSpace.offsetLeft;}
@@ -1860,7 +1844,7 @@ var CodeMirror = (function() {
       cursor.style.visibility = "";
       blinker = setInterval(function() {
         cursor.style.visibility = (on = !on) ? "" : "hidden";
-      }, 650);
+      }, options.cursorBlinkRate);
     }
 
     var matching = {"(": ")>", ")": "(<", "[": "]>", "]": "[<", "{": "}>", "}": "{<"};
@@ -2000,9 +1984,11 @@ var CodeMirror = (function() {
     function endOperation() {
       if (updateMaxLine) computeMaxLength();
       if (maxLineChanged && !options.lineWrapping) {
-        var cursorWidth = widthForcer.offsetWidth, left = stringWidth(maxLine);
-        widthForcer.style.left = left + "px";
-        lineSpace.style.minWidth = (left + cursorWidth) + "px";
+        var cursorWidth = widthForcer.offsetWidth, left = measureLine(maxLine, maxLine.text.length).left;
+        if (!ie_lt8) {
+          widthForcer.style.left = left + "px";
+          lineSpace.style.minWidth = (left + cursorWidth) + "px";
+        }
         maxLineChanged = false;
       }
       var newScrollPos, updated;
@@ -2010,13 +1996,14 @@ var CodeMirror = (function() {
         var coords = calculateCursorCoords();
         newScrollPos = calculateScrollPos(coords.x, coords.y, coords.x, coords.yBot);
       }
-      if (changes.length) updated = updateDisplay(changes, true, (newScrollPos ? newScrollPos.scrollTop : null));
-      else {
+      if (changes.length || newScrollPos && newScrollPos.scrollTop != null)
+        updated = updateDisplay(changes, true, newScrollPos && newScrollPos.scrollTop);
+      if (!updated) {
         if (selectionChanged) updateSelection();
         if (gutterDirty) updateGutter();
       }
       if (newScrollPos) scrollCursorIntoView();
-      if (selectionChanged) {scrollEditorIntoView(); restartBlink();}
+      if (selectionChanged) restartBlink();
 
       if (focused && !leaveInputAlone &&
           (updateInput === true || (updateInput !== false && selectionChanged)))
@@ -2081,11 +2068,13 @@ var CodeMirror = (function() {
     dragDrop: true,
     onChange: null,
     onCursorActivity: null,
+    onViewportChange: null,
     onGutterClick: null,
     onHighlightComplete: null,
     onUpdate: null,
     onFocus: null, onBlur: null, onScroll: null,
     matchBrackets: false,
+    cursorBlinkRate: 530,
     workTime: 100,
     workDelay: 200,
     pollInterval: 100,
@@ -2241,6 +2230,10 @@ var CodeMirror = (function() {
     function lookup(map) {
       map = getKeyMap(map);
       var found = map[name];
+      if (found === false) {
+        if (stop) stop();
+        return true;
+      }
       if (found != null && handle(found)) return true;
       if (map.nofallthrough) {
         if (stop) stop();
@@ -2268,8 +2261,15 @@ var CodeMirror = (function() {
     options.value = textarea.value;
     if (!options.tabindex && textarea.tabindex)
       options.tabindex = textarea.tabindex;
-    if (options.autofocus == null && textarea.getAttribute("autofocus") != null)
-      options.autofocus = true;
+    // Set autofocus to true if this textarea is focused, or if it has
+    // autofocus and no other element is focused.
+    if (options.autofocus == null) {
+      var hasFocus = document.body;
+      // doc.activeElement occasionally throws on IE
+      try { hasFocus = document.activeElement; } catch(e) {}
+      options.autofocus = hasFocus == textarea ||
+        textarea.getAttribute("autofocus") != null && hasFocus == document.body;
+    }
 
     function save() {textarea.value = instance.getValue();}
     if (textarea.form) {
@@ -2277,13 +2277,12 @@ var CodeMirror = (function() {
       var rmSubmit = connect(textarea.form, "submit", save, true);
       if (typeof textarea.form.submit == "function") {
         var realSubmit = textarea.form.submit;
-        function wrappedSubmit() {
+        textarea.form.submit = function wrappedSubmit() {
           save();
           textarea.form.submit = realSubmit;
           textarea.form.submit();
           textarea.form.submit = wrappedSubmit;
-        }
-        textarea.form.submit = wrappedSubmit;
+        };
       }
     }
 
@@ -2306,6 +2305,18 @@ var CodeMirror = (function() {
     return instance;
   };
 
+  var gecko = /gecko\/\d{7}/i.test(navigator.userAgent);
+  var ie = /MSIE \d/.test(navigator.userAgent);
+  var ie_lt8 = /MSIE [1-7]\b/.test(navigator.userAgent);
+  var ie_lt9 = /MSIE [1-8]\b/.test(navigator.userAgent);
+  var quirksMode = ie && document.documentMode == 5;
+  var webkit = /WebKit\//.test(navigator.userAgent);
+  var chrome = /Chrome\//.test(navigator.userAgent);
+  var opera = /Opera\//.test(navigator.userAgent);
+  var safari = /Apple Computer/.test(navigator.vendor);
+  var khtml = /KHTML\//.test(navigator.userAgent);
+  var mac_geLion = /Mac OS X 10\D([7-9]|\d\d)\D/.test(navigator.userAgent);
+
   // Utility functions for working with state. Exported because modes
   // sometimes need to do this.
   function copyState(mode, state) {
@@ -2334,7 +2345,7 @@ var CodeMirror = (function() {
   StringStream.prototype = {
     eol: function() {return this.pos >= this.string.length;},
     sol: function() {return this.pos == 0;},
-    peek: function() {return this.string.charAt(this.pos);},
+    peek: function() {return this.string.charAt(this.pos) || undefined;},
     next: function() {
       if (this.pos < this.string.length)
         return this.string.charAt(this.pos++);
@@ -2365,7 +2376,7 @@ var CodeMirror = (function() {
     indentation: function() {return countColumn(this.string, null, this.tabSize);},
     match: function(pattern, consume, caseInsensitive) {
       if (typeof pattern == "string") {
-        function cased(str) {return caseInsensitive ? str.toLowerCase() : str;}
+        var cased = function(str) {return caseInsensitive ? str.toLowerCase() : str;};
         if (cased(this.string).indexOf(cased(pattern), this.pos) == this.pos) {
           if (consume !== false) this.pos += pattern.length;
           return true;
@@ -2444,14 +2455,22 @@ var CodeMirror = (function() {
     }
   };
 
+  // When measuring the position of the end of a line, different
+  // browsers require different approaches. If an empty span is added,
+  // many browsers report bogus offsets. Of those, some (Webkit,
+  // recent IE) will accept a space without moving the whole span to
+  // the next line when wrapping it, others work with a zero-width
+  // space.
+  var eolSpanContent = " ";
+  if (gecko || (ie && !ie_lt8)) eolSpanContent = "\u200b";
+  else if (opera) eolSpanContent = "";
+
   // Line objects. These hold state related to a line, including
   // highlighting info (the styles array).
   function Line(text, styles) {
     this.styles = styles || [text, null];
     this.text = text;
     this.height = 1;
-    this.marked = this.gutterMarker = this.className = this.bgClassName = this.handlers = null;
-    this.stateAfter = this.parent = this.hidden = null;
   }
   Line.inheritMarks = function(text, orig) {
     var ln = new Line(text), mk = orig && orig.marked;
@@ -2464,7 +2483,7 @@ var CodeMirror = (function() {
       }
     }
     return ln;
-  }
+  };
   Line.prototype = {
     // Replace a piece of a line, keeping the styles around it intact.
     replace: function(from, to_, text) {
@@ -2542,7 +2561,7 @@ var CodeMirror = (function() {
         if (close && omk) {
           for (var j = 0; j < omk.length; ++j) {
             var om = omk[j];
-            if (!om.sameSet(mark) || om.from != null) continue
+            if (!om.sameSet(mark) || om.from != null) continue;
             if (mark.from == this.text.length && om.to == 0) {
               omk.splice(j, 1);
               mk.splice(i--, 1);
@@ -2600,8 +2619,8 @@ var CodeMirror = (function() {
     },
     // Fetch the parser token for a given character. Useful for hacks
     // that want to inspect the mode state (say, for completion).
-    getTokenAt: function(mode, state, ch) {
-      var txt = this.text, stream = new StringStream(txt);
+    getTokenAt: function(mode, state, tabSize, ch) {
+      var txt = this.text, stream = new StringStream(txt, tabSize);
       while (stream.pos < ch && !stream.eol()) {
         stream.start = stream.pos;
         var style = mode.token(stream, state);
@@ -2615,68 +2634,72 @@ var CodeMirror = (function() {
     indentation: function(tabSize) {return countColumn(this.text, null, tabSize);},
     // Produces an HTML fragment for the line, taking selection,
     // marking, and highlighting into account.
-    getHTML: function(makeTab, wrapAt, wrapId, wrapWBR) {
-      var html = [], first = true, col = 0;
-      function span_(text, style) {
+    getElement: function(makeTab, wrapAt, wrapWBR) {
+      var first = true, col = 0, specials = /[\t\u0000-\u0019\u200b\u2028\u2029\uFEFF]/g;
+      var pre = elt("pre");
+      function span_(html, text, style) {
         if (!text) return;
         // Work around a bug where, in some compat modes, IE ignores leading spaces
         if (first && ie && text.charAt(0) == " ") text = "\u00a0" + text.slice(1);
         first = false;
-        if (text.indexOf("\t") == -1) {
+        if (!specials.test(text)) {
           col += text.length;
-          var escaped = htmlEscape(text);
+          var content = document.createTextNode(text);
         } else {
-          var escaped = "";
-          for (var pos = 0;;) {
-            var idx = text.indexOf("\t", pos);
-            if (idx == -1) {
-              escaped += htmlEscape(text.slice(pos));
-              col += text.length - pos;
-              break;
-            } else {
-              col += idx - pos;
+          var content = document.createDocumentFragment(), pos = 0;
+          while (true) {
+            specials.lastIndex = pos;
+            var m = specials.exec(text);
+            var skipped = m ? m.index - pos : text.length - pos;
+            if (skipped) {
+              content.appendChild(document.createTextNode(text.slice(pos, pos + skipped)));
+              col += skipped;
+            }
+            if (!m) break;
+            pos += skipped + 1;
+            if (m[0] == "\t") {
               var tab = makeTab(col);
-              escaped += htmlEscape(text.slice(pos, idx)) + tab.html;
+              content.appendChild(tab.element.cloneNode(true));
               col += tab.width;
-              pos = idx + 1;
+            } else {
+              var token = elt("span", "\u2022", "cm-invalidchar");
+              token.title = "\\u" + m[0].charCodeAt(0).toString(16);
+              content.appendChild(token);
+              col += 1;
             }
           }
         }
-        if (style) html.push('', escaped, "");
-        else html.push(escaped);
+        if (style) html.appendChild(elt("span", [content], style));
+        else html.appendChild(content);
       }
       var span = span_;
       if (wrapAt != null) {
-        var outPos = 0, open = "";
-        span = function(text, style) {
+        var outPos = 0, anchor = pre.anchor = elt("span");
+        span = function(html, text, style) {
           var l = text.length;
           if (wrapAt >= outPos && wrapAt < outPos + l) {
             if (wrapAt > outPos) {
-              span_(text.slice(0, wrapAt - outPos), style);
+              span_(html, text.slice(0, wrapAt - outPos), style);
               // See comment at the definition of spanAffectsWrapping
-              if (wrapWBR) html.push("");
+              if (wrapWBR) html.appendChild(elt("wbr"));
             }
-            html.push(open);
+            html.appendChild(anchor);
             var cut = wrapAt - outPos;
-            span_(opera ? text.slice(cut, cut + 1) : text.slice(cut), style);
-            html.push("");
-            if (opera) span_(text.slice(cut + 1), style);
+            span_(anchor, opera ? text.slice(cut, cut + 1) : text.slice(cut), style);
+            if (opera) span_(html, text.slice(cut + 1), style);
             wrapAt--;
             outPos += l;
           } else {
             outPos += l;
-            span_(text, style);
-            // Output empty wrapper when at end of line
-            // (Gecko and IE8+ do strange wrapping when adding a space
-            // to the end of the line. Other browsers don't react well
-            // to zero-width spaces. So we do hideous browser sniffing
-            // to determine which to use.)
-            if (outPos == wrapAt && outPos == len)
-              html.push(open + (gecko || (ie && !ie_lt8) ? "​" : " ") + "");
+            span_(html, text, style);
+            if (outPos == wrapAt && outPos == len) {
+              setTextContent(anchor, eolSpanContent);
+              html.appendChild(anchor);
+            }
             // Stop outputting HTML when gone sufficiently far beyond measure
             else if (outPos > wrapAt + 10 && /\s/.test(text)) span = function(){};
           }
-        }
+        };
       }
 
       var st = this.styles, allText = this.text, marked = this.marked;
@@ -2685,20 +2708,19 @@ var CodeMirror = (function() {
         if (!style) return null;
         return "cm-" + style.replace(/ +/g, " cm-");
       }
-
       if (!allText && wrapAt == null) {
-        span(" ");
+        span(pre, " ");
       } else if (!marked || !marked.length) {
         for (var i = 0, ch = 0; ch < len; i+=2) {
           var str = st[i], style = st[i+1], l = str.length;
           if (ch + l > len) str = str.slice(0, len - ch);
           ch += l;
-          span(str, styleToClass(style));
+          span(pre, str, styleToClass(style));
         }
       } else {
         var pos = 0, i = 0, text = "", style, sg = 0;
         var nextChange = marked[0].from || 0, marks = [], markpos = 0;
-        function advanceMarks() {
+        var advanceMarks = function() {
           var m;
           while (markpos < marked.length &&
                  ((m = marked[markpos]).from == pos || m.from == null)) {
@@ -2712,7 +2734,7 @@ var CodeMirror = (function() {
             if (to == pos) marks.splice(i--, 1);
             else nextChange = Math.min(to, nextChange);
           }
-        }
+        };
         var m = 0;
         while (pos < len) {
           if (nextChange == pos) advanceMarks();
@@ -2723,7 +2745,7 @@ var CodeMirror = (function() {
               var appliedStyle = style;
               for (var j = 0; j < marks.length; ++j)
                 appliedStyle = (appliedStyle ? appliedStyle + " " : "") + marks[j].style;
-              span(end > upto ? text.slice(0, upto - pos) : text, appliedStyle);
+              span(pre, end > upto ? text.slice(0, upto - pos) : text, appliedStyle);
               if (end >= upto) {text = text.slice(upto - pos); pos = upto; break;}
               pos = end;
             }
@@ -2731,7 +2753,7 @@ var CodeMirror = (function() {
           }
         }
       }
-      return html.join("");
+      return pre;
     },
     cleanUp: function() {
       this.parent = null;
@@ -3038,30 +3060,18 @@ var CodeMirror = (function() {
 
   var Pass = CodeMirror.Pass = {toString: function(){return "CodeMirror.Pass";}};
 
-  var gecko = /gecko\/\d{7}/i.test(navigator.userAgent);
-  var ie = /MSIE \d/.test(navigator.userAgent);
-  var ie_lt8 = /MSIE [1-7]\b/.test(navigator.userAgent);
-  var ie_lt9 = /MSIE [1-8]\b/.test(navigator.userAgent);
-  var quirksMode = ie && document.documentMode == 5;
-  var webkit = /WebKit\//.test(navigator.userAgent);
-  var chrome = /Chrome\//.test(navigator.userAgent);
-  var opera = /Opera\//.test(navigator.userAgent);
-  var safari = /Apple Computer/.test(navigator.vendor);
-  var khtml = /KHTML\//.test(navigator.userAgent);
-  var mac_geLion = /Mac OS X 10\D([7-9]|\d\d)\D/.test(navigator.userAgent);
-
   // Detect drag-and-drop
   var dragAndDrop = function() {
     // There is *some* kind of drag-and-drop support in IE6-8, but I
     // couldn't get it to work yet.
     if (ie_lt9) return false;
-    var div = document.createElement('div');
+    var div = elt('div');
     return "draggable" in div || "dragDrop" in div;
   }();
 
   // Feature-detect whether newlines in textareas are converted to \r\n
   var lineSep = function () {
-    var te = document.createElement("textarea");
+    var te = elt("textarea");
     te.value = "foo\nbar";
     if (te.value.indexOf("\r") > -1) return "\r\n";
     return "\n";
@@ -3093,11 +3103,6 @@ var CodeMirror = (function() {
     return n;
   }
 
-  function computedStyle(elt) {
-    if (elt.currentStyle) return elt.currentStyle;
-    return window.getComputedStyle(elt, null);
-  }
-
   function eltOffset(node, screen) {
     // Take the parts of bounding client rect that we are interested in so we are able to edit if need be,
     // since the returned value cannot be changed externally (they are kept in sync as the element moves within the page)
@@ -3132,27 +3137,28 @@ var CodeMirror = (function() {
   function posLess(a, b) {return a.line < b.line || (a.line == b.line && a.ch < b.ch);}
   function copyPos(x) {return {line: x.line, ch: x.ch};}
 
-  var escapeElement = document.createElement("pre");
-  function htmlEscape(str) {
-    escapeElement.textContent = str;
-    return escapeElement.innerHTML;
+  function elt(tag, content, className, style) {
+    var e = document.createElement(tag);
+    if (className) e.className = className;
+    if (style) e.style.cssText = style;
+    if (typeof content == "string") setTextContent(e, content);
+    else if (content) for (var i = 0; i < content.length; ++i) e.appendChild(content[i]);
+    return e;
   }
-  // Recent (late 2011) Opera betas insert bogus newlines at the start
-  // of the textContent, so we strip those.
-  if (htmlEscape("a") == "\na") {
-    htmlEscape = function(str) {
-      escapeElement.textContent = str;
-      return escapeElement.innerHTML.slice(1);
-    };
-  // Some IEs don't preserve tabs through innerHTML
-  } else if (htmlEscape("\t") != "\t") {
-    htmlEscape = function(str) {
-      escapeElement.innerHTML = "";
-      escapeElement.appendChild(document.createTextNode(str));
-      return escapeElement.innerHTML;
-    };
+  function removeChildren(e) {
+    e.innerHTML = "";
+    return e;
+  }
+  function removeChildrenAndAdd(parent, e) {
+    removeChildren(parent).appendChild(e);
+  }
+  function setTextContent(e, str) {
+    if (ie_lt9) {
+      e.innerHTML = "";
+      e.appendChild(document.createTextNode(str));
+    } else e.textContent = str;
   }
-  CodeMirror.htmlEscape = htmlEscape;
+  CodeMirror.setTextContent = setTextContent;
 
   // Used to position the cursor after an undo/redo by finding the
   // last edited character.
diff --git a/v3/js/codemirror/python.js b/v3/js/codemirror/python.js
index d6888e8e5..fc5b9551c 100644
--- a/v3/js/codemirror/python.js
+++ b/v3/js/codemirror/python.js
@@ -227,7 +227,7 @@ CodeMirror.defineMode("python", function(conf, parserConf) {
             while (state.scopes[0].offset !== _indent) {
                 state.scopes.shift();
             }
-            return false
+            return false;
         } else {
             if (type === 'py') {
                 state.scopes[0].offset = stream.indentation();
diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 22e44dc30..ff8b8bc6d 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -57,7 +57,8 @@ $(document).ready(function() {
     mode: 'python',
     lineNumbers: true,
     tabSize: 4,
-    // convert tab into two spaces:
+    indentUnit: 4,
+    // convert tab into four spaces:
     extraKeys: {Tab: function(cm) {cm.replaceSelection("    ", "end");}}
   });
 

From 5a1c3c0bd3ac4ef6bc97aedc625440550096a3d8 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 10:03:08 -0700
Subject: [PATCH 202/502] added varargs test

---
 v3/tests/backend-tests/varargs.golden | 267 ++++++++++++++++++++++++++
 v3/tests/backend-tests/varargs.txt    |   4 +
 2 files changed, 271 insertions(+)
 create mode 100644 v3/tests/backend-tests/varargs.golden
 create mode 100644 v3/tests/backend-tests/varargs.txt

diff --git a/v3/tests/backend-tests/varargs.golden b/v3/tests/backend-tests/varargs.golden
new file mode 100644
index 000000000..cddf013cb
--- /dev/null
+++ b/v3/tests/backend-tests/varargs.golden
@@ -0,0 +1,267 @@
+{
+  "code": "def parrot(mandatory, mandatory2, *args, **kwargs):\n  pass\n\nparrot('a', 'b', 'c', 'd', 'e', name='Philip', age='35')\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "parrot"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "parrot": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "parrot(mandatory, mandatory2, *a, *r, *g, *s, **k, **w, **a, **r, **g, **s)", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "parrot"
+      ], 
+      "stdout": "", 
+      "func_name": "parrot", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "args": [
+              "REF", 
+              3
+            ], 
+            "mandatory": "a", 
+            "mandatory2": "b", 
+            "kwargs": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "parrot", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "parrot_f1", 
+          "ordered_varnames": [
+            "mandatory", 
+            "mandatory2", 
+            "args", 
+            "kwargs"
+          ]
+        }
+      ], 
+      "globals": {
+        "parrot": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "parrot(mandatory, mandatory2, *a, *r, *g, *s, **k, **w, **a, **r, **g, **s)", 
+          null
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "age", 
+            "35"
+          ], 
+          [
+            "name", 
+            "Philip"
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          "c", 
+          "d", 
+          "e"
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "parrot"
+      ], 
+      "stdout": "", 
+      "func_name": "parrot", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "args": [
+              "REF", 
+              3
+            ], 
+            "mandatory": "a", 
+            "mandatory2": "b", 
+            "kwargs": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "parrot", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "parrot_f1", 
+          "ordered_varnames": [
+            "mandatory", 
+            "mandatory2", 
+            "args", 
+            "kwargs"
+          ]
+        }
+      ], 
+      "globals": {
+        "parrot": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "parrot(mandatory, mandatory2, *a, *r, *g, *s, **k, **w, **a, **r, **g, **s)", 
+          null
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "age", 
+            "35"
+          ], 
+          [
+            "name", 
+            "Philip"
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          "c", 
+          "d", 
+          "e"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "parrot"
+      ], 
+      "stdout": "", 
+      "func_name": "parrot", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": null, 
+            "args": [
+              "REF", 
+              3
+            ], 
+            "mandatory": "a", 
+            "mandatory2": "b", 
+            "kwargs": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "parrot", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "parrot_f1", 
+          "ordered_varnames": [
+            "mandatory", 
+            "mandatory2", 
+            "args", 
+            "kwargs", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "parrot": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "parrot(mandatory, mandatory2, *a, *r, *g, *s, **k, **w, **a, **r, **g, **s)", 
+          null
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "age", 
+            "35"
+          ], 
+          [
+            "name", 
+            "Philip"
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          "c", 
+          "d", 
+          "e"
+        ]
+      }, 
+      "line": 2, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "parrot"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "parrot": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "parrot(mandatory, mandatory2, *a, *r, *g, *s, **k, **w, **a, **r, **g, **s)", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/varargs.txt b/v3/tests/backend-tests/varargs.txt
new file mode 100644
index 000000000..6e26086ea
--- /dev/null
+++ b/v3/tests/backend-tests/varargs.txt
@@ -0,0 +1,4 @@
+def parrot(mandatory, mandatory2, *args, **kwargs):
+  pass
+
+parrot('a', 'b', 'c', 'd', 'e', name='Philip', age='35')

From dc49f3ee2f771005681c66e1abc300fb827a7f09 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 11:40:59 -0700
Subject: [PATCH 203/502] got varags to print properly

---
 v3/pg_encoder.py                      |  4 ++--
 v3/tests/backend-tests/varargs.golden | 10 +++++-----
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/v3/pg_encoder.py b/v3/pg_encoder.py
index 8199e1cb9..92f1dff80 100644
--- a/v3/pg_encoder.py
+++ b/v3/pg_encoder.py
@@ -163,9 +163,9 @@ def encode(self, dat):
 
         printed_args = [e for e in argspec.args]
         if argspec.varargs:
-          printed_args.extend(['*' + e for e in argspec.varargs])
+          printed_args.append('*' + argspec.varargs)
         if argspec.keywords:
-          printed_args.extend(['**' + e for e in argspec.keywords])
+          printed_args.append('**' + argspec.keywords)
 
         func_name = get_name(dat)
         pretty_name = func_name + '(' + ', '.join(printed_args) + ')'
diff --git a/v3/tests/backend-tests/varargs.golden b/v3/tests/backend-tests/varargs.golden
index cddf013cb..64cd90d22 100644
--- a/v3/tests/backend-tests/varargs.golden
+++ b/v3/tests/backend-tests/varargs.golden
@@ -27,7 +27,7 @@
       "heap": {
         "1": [
           "FUNCTION", 
-          "parrot(mandatory, mandatory2, *a, *r, *g, *s, **k, **w, **a, **r, **g, **s)", 
+          "parrot(mandatory, mandatory2, *args, **kwargs)", 
           null
         ]
       }, 
@@ -78,7 +78,7 @@
       "heap": {
         "1": [
           "FUNCTION", 
-          "parrot(mandatory, mandatory2, *a, *r, *g, *s, **k, **w, **a, **r, **g, **s)", 
+          "parrot(mandatory, mandatory2, *args, **kwargs)", 
           null
         ], 
         "2": [
@@ -146,7 +146,7 @@
       "heap": {
         "1": [
           "FUNCTION", 
-          "parrot(mandatory, mandatory2, *a, *r, *g, *s, **k, **w, **a, **r, **g, **s)", 
+          "parrot(mandatory, mandatory2, *args, **kwargs)", 
           null
         ], 
         "2": [
@@ -216,7 +216,7 @@
       "heap": {
         "1": [
           "FUNCTION", 
-          "parrot(mandatory, mandatory2, *a, *r, *g, *s, **k, **w, **a, **r, **g, **s)", 
+          "parrot(mandatory, mandatory2, *args, **kwargs)", 
           null
         ], 
         "2": [
@@ -256,7 +256,7 @@
       "heap": {
         "1": [
           "FUNCTION", 
-          "parrot(mandatory, mandatory2, *a, *r, *g, *s, **k, **w, **a, **r, **g, **s)", 
+          "parrot(mandatory, mandatory2, *args, **kwargs)", 
           null
         ]
       }, 

From 13af7a121e6eb31a3985d67997b2ed566e97521b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 12:00:53 -0700
Subject: [PATCH 204/502] added another mini-lesson

---
 v3/js/opt-lessons.js   |  3 ++-
 v3/lessons/varargs.txt | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+), 1 deletion(-)
 create mode 100644 v3/lessons/varargs.txt

diff --git a/v3/js/opt-lessons.js b/v3/js/opt-lessons.js
index 893edc1da..256c7b1fe 100644
--- a/v3/js/opt-lessons.js
+++ b/v3/js/opt-lessons.js
@@ -102,7 +102,8 @@ $(document).ready(function() {
 
   //$.get("lessons/aliasing.txt", parseLessonFile);
   //$.get("lessons/dive-into-python-311.txt", parseLessonFile);
-  $.get("lessons/for-else.txt", parseLessonFile);
+  //$.get("lessons/for-else.txt", parseLessonFile);
+  $.get("lessons/varargs.txt", parseLessonFile);
 
   // log a generic AJAX error handler
   $(document).ajaxError(function() {
diff --git a/v3/lessons/varargs.txt b/v3/lessons/varargs.txt
new file mode 100644
index 000000000..7cbb62e48
--- /dev/null
+++ b/v3/lessons/varargs.txt
@@ -0,0 +1,35 @@
+def f1(a, b, *rest):
+  pass
+
+f1(1, 2)
+f1(1, 2, 3, 4, 5, 6, 7)
+
+def f2(a, b, **kwrest):
+  pass
+
+f2(1, 2, name='Bob', age=38)
+
+def f3(a, b, *rest, **kwrest):
+  pass
+
+f3(1, 2, 3, 4, name='Bob', age=38)
+======
+{
+  "title": "Optional Function Arguments",
+
+  "description": "Using * and ** in argument names allows Python functions to accept an arbitrary number of optional arguments.",
+
+  "1": "f1 is declared with two mandatory arguments (a and b) and an optional *rest argument.",
+
+  "3": "When you call f1 with only the two mandatory arguments, rest is an empty tuple.",
+
+  "7": "When you call f1 with additional arguments, rest is a tuple that holds the contents of everything after the two mandatory arguments.",
+
+  "10": "f2 is declared with two mandatory arguments and an optional **kwrest argument.",
+
+  "12": "When you call f2 with additional keyword arguments (e.g., name='Bob', age=38), kwrest becomes a dict bound to their respective keys and values.",
+
+  "15": "You can combine up to one * and one ** argument in a function definition.",
+
+  "17": "Now any extra regular arguments (here, the numbers 3 and 4) are found in the *rest tuple, and any extra keyword arguments are in the **kwrest dict."
+}

From 99e101bd403b4474f704e60822002b334e3e2a52 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 12:52:35 -0700
Subject: [PATCH 205/502] teeny

---
 v3/lessons/varargs.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/lessons/varargs.txt b/v3/lessons/varargs.txt
index 7cbb62e48..f2508a89c 100644
--- a/v3/lessons/varargs.txt
+++ b/v3/lessons/varargs.txt
@@ -17,7 +17,7 @@ f3(1, 2, 3, 4, name='Bob', age=38)
 {
   "title": "Optional Function Arguments",
 
-  "description": "Using * and ** in argument names allows Python functions to accept an arbitrary number of optional arguments.",
+  "description": "Prepending certain argument names with * and ** allows Python functions to accept an arbitrary number of optional arguments.",
 
   "1": "f1 is declared with two mandatory arguments (a and b) and an optional *rest argument.",
 

From 1c50dfd82a89bf7818087125240a60838c9045e5 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 14:02:30 -0700
Subject: [PATCH 206/502] minor refactoring of border rendering code

---
 v3/js/pytutor.js | 38 ++++++++++++++++++++++++--------------
 1 file changed, 24 insertions(+), 14 deletions(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index c16bf741d..8ddfc4bf4 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -812,6 +812,18 @@ ExecutionVisualizer.prototype.updateOutput = function() {
     /* if instrLimitReached, then treat like a normal non-terminating line */
     var isTerminated = (!myViz.instrLimitReached && isLastInstr);
 
+    // the highlighted line can either have a 'top' border, 'bottom'
+    // border, or no border (null), depending on the value of 'borderType':
+    var borderType = null;
+    if (!hasError) {
+      if (curEntry.event == 'return' || isTerminated) {
+        borderType = 'bottom';
+      }
+      else {
+        borderType = 'top';
+      }
+    }
+
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.lineNo')
       .attr('id', function(d) {return 'lineNo' + d.lineNumber;})
       .style('color', function(d)
@@ -827,8 +839,7 @@ ExecutionVisualizer.prototype.updateOutput = function() {
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.cod')
       .style('background-color', function(d) {
         if (d.lineNumber == curEntry.line) {
-          d.backgroundColor = hasError ? errorColor :
-                                         (isTerminated ?  terminatedLineColor : highlightedLineColor);
+          d.backgroundColor = hasError ? errorColor : highlightedLineColor;
         }
         else {
           d.backgroundColor = null;
@@ -837,22 +848,21 @@ ExecutionVisualizer.prototype.updateOutput = function() {
         return d.backgroundColor;
       })
       .style('border-top', function(d) {
-        if ((d.lineNumber == curEntry.line) &&
-            (curEntry.event != 'return') &&
-            !hasError && !isTerminated) {
-          return '1px solid ' + highlightedLineTopBorderColor;
+        if ((d.lineNumber == curEntry.line) && (borderType == 'top')) {
+          return '1px solid ' + highlightedLineBorderColor;
         }
         else {
-          // put a default white top border to keep space usage consistent
+          // put a default white border to keep space usage consistent
           return '1px solid #ffffff';
         }
       })
       .style('border-bottom', function(d) {
-        // special case to render horizontal bar *BELOW* the highlighted line
-        if ((d.lineNumber == curEntry.line) &&
-            (curEntry.event == 'return') &&
-            !hasError && !isTerminated) {
-          return '1px solid ' + highlightedLineTopBorderColor;
+        if ((d.lineNumber == curEntry.line) && (borderType == 'bottom')) {
+          return '1px solid ' + highlightedLineBorderColor;
+        }
+        else {
+          // put a default white border to keep space usage consistent
+          return '1px solid #ffffff';
         }
       });
 
@@ -1959,9 +1969,9 @@ ExecutionVisualizer.prototype.redrawConnectors = function() {
 /* colors - see pytutor.css for more colors */
 
 var highlightedLineColor = '#e4faeb';
-var highlightedLineTopBorderColor = '#005583';
+var highlightedLineBorderColor = '#005583';
 
-var visitedLineColor = highlightedLineTopBorderColor;
+var visitedLineColor = highlightedLineBorderColor;
 
 var terminatedLineColor = '#a2eebd';
 

From f08864aae28954a56f4bcb754390f2cf1fa7f1e8 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 14:21:00 -0700
Subject: [PATCH 207/502] highlight function call site

---
 v3/js/pytutor.js | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 8ddfc4bf4..8381c1d29 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -824,6 +824,15 @@ ExecutionVisualizer.prototype.updateOutput = function() {
       }
     }
 
+    var funcCallSiteLine = null;
+
+    // highlight the call site for a 'call' instruction
+    if (curEntry.event == 'call' && myViz.curInstr > 0) {
+      var prevEntry = myViz.curTrace[myViz.curInstr - 1];
+      funcCallSiteLine = prevEntry.line;
+    }
+
+
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.lineNo')
       .attr('id', function(d) {return 'lineNo' + d.lineNumber;})
       .style('color', function(d)
@@ -839,7 +848,12 @@ ExecutionVisualizer.prototype.updateOutput = function() {
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.cod')
       .style('background-color', function(d) {
         if (d.lineNumber == curEntry.line) {
-          d.backgroundColor = hasError ? errorColor : highlightedLineColor;
+          d.backgroundColor = hasError ? errorColor :
+                                         (funcCallSiteLine ? funcCallLineColor :
+                                                             highlightedLineColor);
+        }
+        else if (d.lineNumber == funcCallSiteLine) {
+          d.backgroundColor = highlightedLineColor;
         }
         else {
           d.backgroundColor = null;
@@ -1973,7 +1987,7 @@ var highlightedLineBorderColor = '#005583';
 
 var visitedLineColor = highlightedLineBorderColor;
 
-var terminatedLineColor = '#a2eebd';
+var funcCallLineColor = '#a2eebd';
 
 var darkRed = '#d03939';
 

From 04fee872331615a153171496521fc4ca0e86a99b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 14:33:25 -0700
Subject: [PATCH 208/502] highlight function return site too

---
 v3/js/pytutor.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 8381c1d29..54dc401c3 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -832,6 +832,12 @@ ExecutionVisualizer.prototype.updateOutput = function() {
       funcCallSiteLine = prevEntry.line;
     }
 
+    var funcReturnSiteLine = null;
+    // highlight the return site for a 'return' instruction
+    if (curEntry.event == 'return' && myViz.curInstr < myViz.curTrace.length - 1) {
+      var nextEntry = myViz.curTrace[myViz.curInstr + 1];
+      funcReturnSiteLine = nextEntry.line;
+    }
 
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.lineNo')
       .attr('id', function(d) {return 'lineNo' + d.lineNumber;})
@@ -855,6 +861,9 @@ ExecutionVisualizer.prototype.updateOutput = function() {
         else if (d.lineNumber == funcCallSiteLine) {
           d.backgroundColor = highlightedLineColor;
         }
+        else if (d.lineNumber == funcReturnSiteLine) {
+          d.backgroundColor = highlightedLineLighterColor;
+        }
         else {
           d.backgroundColor = null;
         }
@@ -1985,6 +1994,8 @@ ExecutionVisualizer.prototype.redrawConnectors = function() {
 var highlightedLineColor = '#e4faeb';
 var highlightedLineBorderColor = '#005583';
 
+var highlightedLineLighterColor = '#effff4';
+
 var visitedLineColor = highlightedLineBorderColor;
 
 var funcCallLineColor = '#a2eebd';

From 4d35293aadd0e612829e73a240fdaef8f6873de0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 14:44:12 -0700
Subject: [PATCH 209/502] minor color

---
 v3/js/pytutor.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 54dc401c3..7748fe29c 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -1994,7 +1994,7 @@ ExecutionVisualizer.prototype.redrawConnectors = function() {
 var highlightedLineColor = '#e4faeb';
 var highlightedLineBorderColor = '#005583';
 
-var highlightedLineLighterColor = '#effff4';
+var highlightedLineLighterColor = '#ecfff1';
 
 var visitedLineColor = highlightedLineBorderColor;
 

From 3c2f4cd339d1557139dfc9dd848c1252ac6cc0ac Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 15:05:34 -0700
Subject: [PATCH 210/502] got generators working

---
 v3/pg_logger.py                               |     6 +-
 .../backend-tests/generator_use_test.golden   | 11318 ++++++++++++++++
 v3/tests/backend-tests/generator_use_test.txt |     9 +
 3 files changed, 11332 insertions(+), 1 deletion(-)
 create mode 100644 v3/tests/backend-tests/generator_use_test.golden
 create mode 100644 v3/tests/backend-tests/generator_use_test.txt

diff --git a/v3/pg_logger.py b/v3/pg_logger.py
index ec8390ef3..52d13958d 100644
--- a/v3/pg_logger.py
+++ b/v3/pg_logger.py
@@ -282,7 +282,11 @@ def interaction(self, frame, traceback, event_type):
                                   # or else we won't properly capture heap object mutations in the trace!
 
         if event_type == 'call':
-          assert top_frame not in self.frame_ordered_ids
+          # Don't be so strict about this assertion because it FAILS
+          # when you're calling a generator (not for the first time),
+          # since that frame has already previously been on the stack ...
+          #assert top_frame not in self.frame_ordered_ids
+
           self.frame_ordered_ids[top_frame] = self.cur_frame_id
           self.cur_frame_id += 1
 
diff --git a/v3/tests/backend-tests/generator_use_test.golden b/v3/tests/backend-tests/generator_use_test.golden
new file mode 100644
index 000000000..2276f75de
--- /dev/null
+++ b/v3/tests/backend-tests/generator_use_test.golden
@@ -0,0 +1,11318 @@
+{
+  "code": "def gen_odds():\n  x = 1\n  while True:\n    yield x\n    x += 2\n\nfor i in gen_odds():\n  print i\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds"
+      ], 
+      "stdout": "", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds"
+      ], 
+      "stdout": "", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds"
+      ], 
+      "stdout": "", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f1", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds"
+      ], 
+      "stdout": "", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f1", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds"
+      ], 
+      "stdout": "", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": 1, 
+            "x": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f1", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n3\n5\n7\n9\n11\n13\n15\n17\n19\n21\n23\n25\n27\n29\n31\n33\n35\n37\n39\n41\n43\n45\n47\n49\n51\n53\n55\n57\n59\n61\n63\n65\n67\n69\n71\n73\n75\n77\n79\n81\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 81, 
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n3\n5\n7\n9\n11\n13\n15\n17\n19\n21\n23\n25\n27\n29\n31\n33\n35\n37\n39\n41\n43\n45\n47\n49\n51\n53\n55\n57\n59\n61\n63\n65\n67\n69\n71\n73\n75\n77\n79\n81\n", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 42, 
+          "encoded_locals": {
+            "__return__": 81, 
+            "x": 81
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f42", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "i": 81, 
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n3\n5\n7\n9\n11\n13\n15\n17\n19\n21\n23\n25\n27\n29\n31\n33\n35\n37\n39\n41\n43\n45\n47\n49\n51\n53\n55\n57\n59\n61\n63\n65\n67\n69\n71\n73\n75\n77\n79\n81\n", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 42, 
+          "encoded_locals": {
+            "__return__": 81, 
+            "x": 81
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f42", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "i": 81, 
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n3\n5\n7\n9\n11\n13\n15\n17\n19\n21\n23\n25\n27\n29\n31\n33\n35\n37\n39\n41\n43\n45\n47\n49\n51\n53\n55\n57\n59\n61\n63\n65\n67\n69\n71\n73\n75\n77\n79\n81\n", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 42, 
+          "encoded_locals": {
+            "__return__": 81, 
+            "x": 83
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f42", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "i": 81, 
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n3\n5\n7\n9\n11\n13\n15\n17\n19\n21\n23\n25\n27\n29\n31\n33\n35\n37\n39\n41\n43\n45\n47\n49\n51\n53\n55\n57\n59\n61\n63\n65\n67\n69\n71\n73\n75\n77\n79\n81\n", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 42, 
+          "encoded_locals": {
+            "__return__": 81, 
+            "x": 83
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f42", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "i": 81, 
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n3\n5\n7\n9\n11\n13\n15\n17\n19\n21\n23\n25\n27\n29\n31\n33\n35\n37\n39\n41\n43\n45\n47\n49\n51\n53\n55\n57\n59\n61\n63\n65\n67\n69\n71\n73\n75\n77\n79\n81\n", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 42, 
+          "encoded_locals": {
+            "__return__": 83, 
+            "x": 83
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f42", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "i": 81, 
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n3\n5\n7\n9\n11\n13\n15\n17\n19\n21\n23\n25\n27\n29\n31\n33\n35\n37\n39\n41\n43\n45\n47\n49\n51\n53\n55\n57\n59\n61\n63\n65\n67\n69\n71\n73\n75\n77\n79\n81\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 83, 
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n3\n5\n7\n9\n11\n13\n15\n17\n19\n21\n23\n25\n27\n29\n31\n33\n35\n37\n39\n41\n43\n45\n47\n49\n51\n53\n55\n57\n59\n61\n63\n65\n67\n69\n71\n73\n75\n77\n79\n81\n83\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 83, 
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n3\n5\n7\n9\n11\n13\n15\n17\n19\n21\n23\n25\n27\n29\n31\n33\n35\n37\n39\n41\n43\n45\n47\n49\n51\n53\n55\n57\n59\n61\n63\n65\n67\n69\n71\n73\n75\n77\n79\n81\n83\n", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 43, 
+          "encoded_locals": {
+            "__return__": 83, 
+            "x": 83
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f43", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "i": 83, 
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n3\n5\n7\n9\n11\n13\n15\n17\n19\n21\n23\n25\n27\n29\n31\n33\n35\n37\n39\n41\n43\n45\n47\n49\n51\n53\n55\n57\n59\n61\n63\n65\n67\n69\n71\n73\n75\n77\n79\n81\n83\n", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 43, 
+          "encoded_locals": {
+            "__return__": 83, 
+            "x": 83
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f43", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "i": 83, 
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n3\n5\n7\n9\n11\n13\n15\n17\n19\n21\n23\n25\n27\n29\n31\n33\n35\n37\n39\n41\n43\n45\n47\n49\n51\n53\n55\n57\n59\n61\n63\n65\n67\n69\n71\n73\n75\n77\n79\n81\n83\n", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 43, 
+          "encoded_locals": {
+            "__return__": 83, 
+            "x": 85
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f43", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "i": 83, 
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n3\n5\n7\n9\n11\n13\n15\n17\n19\n21\n23\n25\n27\n29\n31\n33\n35\n37\n39\n41\n43\n45\n47\n49\n51\n53\n55\n57\n59\n61\n63\n65\n67\n69\n71\n73\n75\n77\n79\n81\n83\n", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 43, 
+          "encoded_locals": {
+            "__return__": 83, 
+            "x": 85
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f43", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "i": 83, 
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "exception_msg": "(stopped after 300 steps to prevent possible infinite loop)", 
+      "event": "instruction_limit_reached"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/generator_use_test.txt b/v3/tests/backend-tests/generator_use_test.txt
new file mode 100644
index 000000000..0577e1434
--- /dev/null
+++ b/v3/tests/backend-tests/generator_use_test.txt
@@ -0,0 +1,9 @@
+def gen_odds():
+  x = 1
+  while True:
+    yield x
+    x += 2
+
+for i in gen_odds():
+  print i
+

From 685a650425028853fe7fe1a741c4337b4594b8ba Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 15:12:23 -0700
Subject: [PATCH 211/502] remove top border on function call highlights

---
 v3/js/pytutor.js | 28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 7748fe29c..834d829d9 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -812,20 +812,7 @@ ExecutionVisualizer.prototype.updateOutput = function() {
     /* if instrLimitReached, then treat like a normal non-terminating line */
     var isTerminated = (!myViz.instrLimitReached && isLastInstr);
 
-    // the highlighted line can either have a 'top' border, 'bottom'
-    // border, or no border (null), depending on the value of 'borderType':
-    var borderType = null;
-    if (!hasError) {
-      if (curEntry.event == 'return' || isTerminated) {
-        borderType = 'bottom';
-      }
-      else {
-        borderType = 'top';
-      }
-    }
-
     var funcCallSiteLine = null;
-
     // highlight the call site for a 'call' instruction
     if (curEntry.event == 'call' && myViz.curInstr > 0) {
       var prevEntry = myViz.curTrace[myViz.curInstr - 1];
@@ -839,6 +826,21 @@ ExecutionVisualizer.prototype.updateOutput = function() {
       funcReturnSiteLine = nextEntry.line;
     }
 
+
+    // the highlighted line can either have a 'top' border, 'bottom'
+    // border, or no border (null), depending on the value of 'borderType':
+    var borderType = null;
+    if (!hasError && !funcCallSiteLine) {
+      if (curEntry.event == 'return' || isTerminated) {
+        borderType = 'bottom';
+      }
+      else {
+        borderType = 'top';
+      }
+    }
+
+
+
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.lineNo')
       .attr('id', function(d) {return 'lineNo' + d.lineNumber;})
       .style('color', function(d)

From 89e52c2e503015336de174ca90c8d4725216684d Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 15:14:01 -0700
Subject: [PATCH 212/502] don't put trailing '()' on function names in stack
 frames

---
 v3/js/pytutor.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 834d829d9..fe3bc35ae 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -1793,7 +1793,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
       // (might contain '<' or '>' for weird names like )
       var funcName = htmlspecialchars(frame.func_name).replace('<lambda>', '\u03bb');
 
-      var headerLabel = funcName + '()';
+      var headerLabel = funcName;
 
       // only display if you're someone's parent
       if (frame.is_parent) {

From f51b7d9c38fc16742e08a9d3aeddc49ba5281693 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 15:19:01 -0700
Subject: [PATCH 213/502] got generator expressions displayed properly

---
 v3/js/pytutor.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index fe3bc35ae..720b2023b 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -2054,11 +2054,13 @@ String.prototype.rtrim = function() {
 // are NOT legal names for CSS ID's.
 // I also threw in '{', '}', '(', ')', '<', '>' as illegal characters.
 //
+// also some variable names are like '.0' (for generator expressions),
+// and '.' seems to be illegal.
 // TODO: what other characters are illegal???
 var lbRE = new RegExp('\\[|{|\\(|<', 'g');
 var rbRE = new RegExp('\\]|}|\\)|>', 'g');
 function varnameToCssID(varname) {
-  return varname.replace(lbRE, 'LeftB_').replace(rbRE, '_RightB');
+  return varname.replace(lbRE, 'LeftB_').replace(rbRE, '_RightB').replace('.', '_DOT_');
 }
 
 

From 3ef55dbbdd7873ee10af008723fdb904e487a779 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 15:22:02 -0700
Subject: [PATCH 214/502] make return value label red

---
 v3/css/pytutor.css | 1 +
 1 file changed, 1 insertion(+)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 91f0594cd..62e79ad4a 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -179,6 +179,7 @@ div.ExecutionVisualizer .funcObj {
 
 div.ExecutionVisualizer .retval {
   font-size: 9pt;
+  color: #d03939; /* dark red */
 }
 
 

From 219ee06a907d894fc5093a449ac9e4cc39809dbe Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 15:29:53 -0700
Subject: [PATCH 215/502] added generate primes example

---
 v3/example-code/gen_primes.golden | 13082 ++++++++++++++++++++++++++++
 v3/example-code/gen_primes.txt    |    14 +
 v3/js/opt-frontend.js             |     4 +
 v3/tutor.html                     |     6 +-
 4 files changed, 13104 insertions(+), 2 deletions(-)
 create mode 100644 v3/example-code/gen_primes.golden
 create mode 100644 v3/example-code/gen_primes.txt

diff --git a/v3/example-code/gen_primes.golden b/v3/example-code/gen_primes.golden
new file mode 100644
index 000000000..1792ebafa
--- /dev/null
+++ b/v3/example-code/gen_primes.golden
@@ -0,0 +1,13082 @@
+{
+  "code": "# Use generator to generate a stream of primes\ndef gen_primes():\n    n = 2\n    while True:\n        for x in range(2, n):\n            if n % x == 0:\n                break\n        else:\n            yield n\n        n += 1\n\nfor p in gen_primes():\n    print p\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_primes"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "gen_primes": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_primes()", 
+          null
+        ]
+      }, 
+      "line": 12, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_primes"
+      ], 
+      "stdout": "", 
+      "func_name": "gen_primes", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_primes", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_primes_f1", 
+          "ordered_varnames": []
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+      "globals": {
+        "p": 19, 
+        "gen_primes": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_primes()", 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_primes", 
+        "p"
+      ], 
+      "stdout": "2\n3\n5\n7\n11\n13\n17\n19\n", 
+      "func_name": "gen_primes", 
+      "stack_to_render": [
+        {
+          "frame_id": 9, 
+          "encoded_locals": {
+            "__return__": 19, 
+            "x": 16, 
+            "n": 23
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_primes", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_primes_f9", 
+          "ordered_varnames": [
+            "n", 
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "p": 19, 
+        "gen_primes": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_primes()", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_primes", 
+        "p"
+      ], 
+      "stdout": "2\n3\n5\n7\n11\n13\n17\n19\n", 
+      "func_name": "gen_primes", 
+      "stack_to_render": [
+        {
+          "frame_id": 9, 
+          "encoded_locals": {
+            "__return__": 19, 
+            "x": 17, 
+            "n": 23
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_primes", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_primes_f9", 
+          "ordered_varnames": [
+            "n", 
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "p": 19, 
+        "gen_primes": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_primes()", 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_primes", 
+        "p"
+      ], 
+      "stdout": "2\n3\n5\n7\n11\n13\n17\n19\n", 
+      "func_name": "gen_primes", 
+      "stack_to_render": [
+        {
+          "frame_id": 9, 
+          "encoded_locals": {
+            "__return__": 19, 
+            "x": 17, 
+            "n": 23
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_primes", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_primes_f9", 
+          "ordered_varnames": [
+            "n", 
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "p": 19, 
+        "gen_primes": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_primes()", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_primes", 
+        "p"
+      ], 
+      "stdout": "2\n3\n5\n7\n11\n13\n17\n19\n", 
+      "func_name": "gen_primes", 
+      "stack_to_render": [
+        {
+          "frame_id": 9, 
+          "encoded_locals": {
+            "__return__": 19, 
+            "x": 18, 
+            "n": 23
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_primes", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_primes_f9", 
+          "ordered_varnames": [
+            "n", 
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "p": 19, 
+        "gen_primes": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_primes()", 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_primes", 
+        "p"
+      ], 
+      "stdout": "2\n3\n5\n7\n11\n13\n17\n19\n", 
+      "func_name": "gen_primes", 
+      "stack_to_render": [
+        {
+          "frame_id": 9, 
+          "encoded_locals": {
+            "__return__": 19, 
+            "x": 18, 
+            "n": 23
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_primes", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_primes_f9", 
+          "ordered_varnames": [
+            "n", 
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "p": 19, 
+        "gen_primes": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_primes()", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_primes", 
+        "p"
+      ], 
+      "stdout": "2\n3\n5\n7\n11\n13\n17\n19\n", 
+      "func_name": "gen_primes", 
+      "stack_to_render": [
+        {
+          "frame_id": 9, 
+          "encoded_locals": {
+            "__return__": 19, 
+            "x": 19, 
+            "n": 23
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_primes", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_primes_f9", 
+          "ordered_varnames": [
+            "n", 
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "p": 19, 
+        "gen_primes": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_primes()", 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_primes", 
+        "p"
+      ], 
+      "stdout": "2\n3\n5\n7\n11\n13\n17\n19\n", 
+      "func_name": "gen_primes", 
+      "stack_to_render": [
+        {
+          "frame_id": 9, 
+          "encoded_locals": {
+            "__return__": 19, 
+            "x": 19, 
+            "n": 23
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_primes", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_primes_f9", 
+          "ordered_varnames": [
+            "n", 
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "p": 19, 
+        "gen_primes": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_primes()", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_primes", 
+        "p"
+      ], 
+      "stdout": "2\n3\n5\n7\n11\n13\n17\n19\n", 
+      "func_name": "gen_primes", 
+      "stack_to_render": [
+        {
+          "frame_id": 9, 
+          "encoded_locals": {
+            "__return__": 19, 
+            "x": 20, 
+            "n": 23
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_primes", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_primes_f9", 
+          "ordered_varnames": [
+            "n", 
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "p": 19, 
+        "gen_primes": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_primes()", 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "exception_msg": "(stopped after 300 steps to prevent possible infinite loop)", 
+      "event": "instruction_limit_reached"
+    }
+  ]
+}
diff --git a/v3/example-code/gen_primes.txt b/v3/example-code/gen_primes.txt
new file mode 100644
index 000000000..a41dc831f
--- /dev/null
+++ b/v3/example-code/gen_primes.txt
@@ -0,0 +1,14 @@
+# Use generator to generate a stream of primes
+def gen_primes():
+    n = 2
+    while True:
+        for x in range(2, n):
+            if n % x == 0:
+                break
+        else:
+            yield n
+        n += 1
+
+for p in gen_primes():
+    print p
+
diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index ff8b8bc6d..a23f070f4 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -308,6 +308,10 @@ $(document).ready(function() {
     return false;
   });
 
+  $("#genPrimesLink").click(function() {
+    $.get("example-code/gen_primes.txt", setCodeMirrorVal);
+    return false;
+  });
 
 
   $('#closure1Link').click(function() {
diff --git a/v3/tutor.html b/v3/tutor.html
index bc58f4853..441f9baa4 100644
--- a/v3/tutor.html
+++ b/v3/tutor.html
@@ -89,8 +89,10 @@
 sumList |
 towers of hanoi |
 exceptions |
-sum cubes |
-decorators
+sum cubes
+

+decorators |
+generators
 
 

 

From 23cd52ca7dfad21a1156f6e58f5fa207059577f1 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 17:39:52 -0700
Subject: [PATCH 216/502] clear up crufty old __return__ values

---
 v3/pg_logger.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/v3/pg_logger.py b/v3/pg_logger.py
index 52d13958d..3e2b33079 100644
--- a/v3/pg_logger.py
+++ b/v3/pg_logger.py
@@ -254,6 +254,12 @@ def user_return(self, frame, return_value):
         """This function is called when a return trap is set here."""
         frame.f_locals['__return__'] = return_value
         self.interaction(frame, None, 'return')
+        # delete __return__ so that on subsequent calls to
+        # a generator function, the OLD yielded (returned)
+        # value gets deleted from the frame ...
+        # (this also clears away crufty obsolete return values in other
+        # kinds of examples as well, most notably those involving closures)
+        del frame.f_locals['__return__']
 
     def user_exception(self, frame, exc_info):
         exc_type, exc_value, exc_traceback = exc_info

From 6d2f229aaec0a339f36feb635920f236ed8ddeeb Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 17:40:33 -0700
Subject: [PATCH 217/502] minor color change

---
 v3/js/pytutor.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 720b2023b..3b0e60386 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -1996,7 +1996,7 @@ ExecutionVisualizer.prototype.redrawConnectors = function() {
 var highlightedLineColor = '#e4faeb';
 var highlightedLineBorderColor = '#005583';
 
-var highlightedLineLighterColor = '#ecfff1';
+var highlightedLineLighterColor = '#edfff2';
 
 var visitedLineColor = highlightedLineBorderColor;
 

From cfe110c951837ad0ccdd7d159d2206c82963b536 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 17:40:41 -0700
Subject: [PATCH 218/502] update loads of tests

---
 v3/example-code/closures/closure1.golden      |   35 +-
 v3/example-code/closures/closure2.golden      |  161 +--
 v3/example-code/closures/closure3.golden      |   77 +-
 v3/example-code/closures/closure4.golden      |  147 +--
 v3/example-code/closures/closure5.golden      |  653 ++--------
 v3/example-code/closures/lambda-param.golden  |    4 +-
 v3/example-code/decorators.golden             |  175 +--
 v3/example-code/gen_primes.golden             | 1076 +++++------------
 v3/example-code/linked-lists/ll2.golden       |  829 +------------
 v3/example-code/map.golden                    |    7 +-
 v3/example-code/oop_1.golden                  |  595 +--------
 v3/example-code/oop_2.golden                  |  504 +-------
 v3/example-code/oop_inherit.golden            |  816 +------------
 v3/example-code/oop_small.golden              |  351 ++----
 v3/example-code/sqrt.golden                   |   20 +-
 v3/example-code/sum.golden                    |    4 +-
 v3/tests/backend-tests/class_test.golden      |  532 +-------
 .../backend-tests/generator_use_test.golden   |  672 +++-------
 v3/tests/backend-tests/john-compose.golden    |   77 +-
 v3/tests/backend-tests/lambda_1.golden        |    4 +-
 v3/tests/backend-tests/ling-scheme-2.golden   |    7 +-
 v3/tests/backend-tests/ling-scheme-3.golden   |    7 +-
 v3/tests/backend-tests/newstyle_class.golden  |  308 +----
 23 files changed, 870 insertions(+), 6191 deletions(-)

diff --git a/v3/example-code/closures/closure1.golden b/v3/example-code/closures/closure1.golden
index 3652e7a3f..60b1b4eab 100644
--- a/v3/example-code/closures/closure1.golden
+++ b/v3/example-code/closures/closure1.golden
@@ -227,10 +227,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "bar": [
               "REF", 
               2
@@ -244,8 +240,7 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }
       ], 
@@ -286,10 +281,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "bar": [
               "REF", 
               2
@@ -303,8 +294,7 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
@@ -362,10 +352,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "bar": [
               "REF", 
               2
@@ -379,8 +365,7 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
@@ -438,10 +423,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "bar": [
               "REF", 
               2
@@ -455,8 +436,7 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
@@ -516,10 +496,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "bar": [
               "REF", 
               2
@@ -533,8 +509,7 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }
       ], 
diff --git a/v3/example-code/closures/closure2.golden b/v3/example-code/closures/closure2.golden
index e7a544a04..044859126 100644
--- a/v3/example-code/closures/closure2.golden
+++ b/v3/example-code/closures/closure2.golden
@@ -301,10 +301,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "bar": [
               "REF", 
               3
@@ -318,8 +314,7 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }
       ], 
@@ -370,10 +365,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "bar": [
               "REF", 
               3
@@ -387,8 +378,7 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
@@ -454,10 +444,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "bar": [
               "REF", 
               3
@@ -471,8 +457,7 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
@@ -538,10 +523,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "bar": [
               "REF", 
               3
@@ -555,8 +536,7 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
@@ -632,10 +612,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "bar": [
               "REF", 
               3
@@ -649,8 +625,7 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
@@ -732,10 +707,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "bar": [
               "REF", 
               3
@@ -749,18 +720,13 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "bar_deux": [
               "REF", 
               4
@@ -774,8 +740,7 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux", 
-            "__return__"
+            "bar_deux"
           ]
         }
       ], 
@@ -836,10 +801,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "bar": [
               "REF", 
               3
@@ -853,18 +814,13 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "bar_deux": [
               "REF", 
               4
@@ -878,8 +834,7 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux", 
-            "__return__"
+            "bar_deux"
           ]
         }, 
         {
@@ -957,10 +912,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "bar": [
               "REF", 
               3
@@ -974,18 +925,13 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "bar_deux": [
               "REF", 
               4
@@ -999,8 +945,7 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux", 
-            "__return__"
+            "bar_deux"
           ]
         }, 
         {
@@ -1078,10 +1023,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "bar": [
               "REF", 
               3
@@ -1095,18 +1036,13 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "bar_deux": [
               "REF", 
               4
@@ -1120,8 +1056,7 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux", 
-            "__return__"
+            "bar_deux"
           ]
         }, 
         {
@@ -1201,10 +1136,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "bar": [
               "REF", 
               3
@@ -1218,18 +1149,13 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "bar_deux": [
               "REF", 
               4
@@ -1243,8 +1169,7 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux", 
-            "__return__"
+            "bar_deux"
           ]
         }
       ], 
@@ -1305,10 +1230,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "bar": [
               "REF", 
               3
@@ -1322,18 +1243,13 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "bar_deux": [
               "REF", 
               4
@@ -1347,8 +1263,7 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux", 
-            "__return__"
+            "bar_deux"
           ]
         }, 
         {
@@ -1426,10 +1341,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "bar": [
               "REF", 
               3
@@ -1443,18 +1354,13 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "bar_deux": [
               "REF", 
               4
@@ -1468,8 +1374,7 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux", 
-            "__return__"
+            "bar_deux"
           ]
         }, 
         {
@@ -1547,10 +1452,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "bar": [
               "REF", 
               3
@@ -1564,18 +1465,13 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "bar_deux": [
               "REF", 
               4
@@ -1589,8 +1485,7 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux", 
-            "__return__"
+            "bar_deux"
           ]
         }, 
         {
@@ -1670,10 +1565,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "bar": [
               "REF", 
               3
@@ -1687,18 +1578,13 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "bar_deux": [
               "REF", 
               4
@@ -1712,8 +1598,7 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux", 
-            "__return__"
+            "bar_deux"
           ]
         }
       ], 
diff --git a/v3/example-code/closures/closure3.golden b/v3/example-code/closures/closure3.golden
index fe2310a1a..1f347f420 100644
--- a/v3/example-code/closures/closure3.golden
+++ b/v3/example-code/closures/closure3.golden
@@ -665,10 +665,6 @@
               "REF", 
               4
             ], 
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "baz": [
               "REF", 
               5
@@ -684,8 +680,7 @@
           "unique_hash": "bar_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "baz", 
-            "__return__"
+            "baz"
           ]
         }
       ], 
@@ -744,10 +739,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": [
               "REF", 
               2
@@ -765,8 +756,7 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
@@ -776,10 +766,6 @@
               "REF", 
               4
             ], 
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "baz": [
               "REF", 
               5
@@ -795,8 +781,7 @@
           "unique_hash": "bar_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "baz", 
-            "__return__"
+            "baz"
           ]
         }
       ], 
@@ -859,10 +844,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": [
               "REF", 
               2
@@ -880,8 +861,7 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
@@ -891,10 +871,6 @@
               "REF", 
               4
             ], 
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "baz": [
               "REF", 
               5
@@ -910,8 +886,7 @@
           "unique_hash": "bar_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "baz", 
-            "__return__"
+            "baz"
           ]
         }, 
         {
@@ -1003,10 +978,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": [
               "REF", 
               2
@@ -1024,8 +995,7 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
@@ -1035,10 +1005,6 @@
               "REF", 
               4
             ], 
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "baz": [
               "REF", 
               5
@@ -1054,8 +1020,7 @@
           "unique_hash": "bar_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "baz", 
-            "__return__"
+            "baz"
           ]
         }, 
         {
@@ -1147,10 +1112,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": [
               "REF", 
               2
@@ -1168,8 +1129,7 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
@@ -1179,10 +1139,6 @@
               "REF", 
               4
             ], 
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "baz": [
               "REF", 
               5
@@ -1198,8 +1154,7 @@
           "unique_hash": "bar_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "baz", 
-            "__return__"
+            "baz"
           ]
         }, 
         {
@@ -1293,10 +1248,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": [
               "REF", 
               2
@@ -1314,8 +1265,7 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "bar", 
-            "__return__"
+            "bar"
           ]
         }, 
         {
@@ -1325,10 +1275,6 @@
               "REF", 
               4
             ], 
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "baz": [
               "REF", 
               5
@@ -1344,8 +1290,7 @@
           "unique_hash": "bar_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "baz", 
-            "__return__"
+            "baz"
           ]
         }
       ], 
diff --git a/v3/example-code/closures/closure4.golden b/v3/example-code/closures/closure4.golden
index 914a59b4e..268bc8945 100644
--- a/v3/example-code/closures/closure4.golden
+++ b/v3/example-code/closures/closure4.golden
@@ -226,10 +226,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -244,8 +240,7 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }
       ], 
@@ -285,10 +280,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -303,8 +294,7 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -359,10 +349,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -377,8 +363,7 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -433,10 +418,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -451,8 +432,7 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -517,10 +497,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -535,8 +511,7 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -607,10 +582,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -625,17 +596,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 2, 
             "g": [
               "REF", 
@@ -650,8 +616,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }
       ], 
@@ -701,10 +666,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -719,17 +680,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 2, 
             "g": [
               "REF", 
@@ -744,8 +700,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -812,10 +767,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -830,17 +781,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 2, 
             "g": [
               "REF", 
@@ -855,8 +801,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -923,10 +868,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -941,17 +882,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 2, 
             "g": [
               "REF", 
@@ -966,8 +902,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -1036,10 +971,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -1054,17 +985,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 2, 
             "g": [
               "REF", 
@@ -1079,8 +1005,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -1147,10 +1072,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -1165,17 +1086,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 2, 
             "g": [
               "REF", 
@@ -1190,8 +1106,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -1258,10 +1173,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -1276,17 +1187,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 2, 
             "g": [
               "REF", 
@@ -1301,8 +1207,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -1371,10 +1276,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -1389,17 +1290,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 2, 
             "g": [
               "REF", 
@@ -1414,8 +1310,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }
       ], 
diff --git a/v3/example-code/closures/closure5.golden b/v3/example-code/closures/closure5.golden
index 037cbb077..22e743525 100644
--- a/v3/example-code/closures/closure5.golden
+++ b/v3/example-code/closures/closure5.golden
@@ -231,10 +231,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -249,8 +245,7 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }
       ], 
@@ -295,10 +290,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -313,8 +304,7 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -374,10 +364,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -392,8 +378,7 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -453,10 +438,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -471,8 +452,7 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -542,10 +522,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -560,8 +536,7 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
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@@ -660,17 +631,12 @@
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@@ -685,8 +651,7 @@
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@@ -746,10 +711,6 @@
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@@ -764,17 +725,12 @@
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@@ -789,8 +745,7 @@
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@@ -863,10 +818,6 @@
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@@ -881,17 +832,12 @@
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@@ -906,8 +852,7 @@
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@@ -980,10 +925,6 @@
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@@ -998,17 +939,12 @@
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@@ -1023,8 +959,7 @@
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@@ -1116,10 +1051,6 @@
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@@ -1134,17 +1065,12 @@
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@@ -1159,8 +1085,7 @@
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@@ -1252,10 +1177,6 @@
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@@ -1270,17 +1191,12 @@
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@@ -1295,8 +1211,7 @@
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@@ -1388,10 +1303,6 @@
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@@ -1406,17 +1317,12 @@
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@@ -1431,8 +1337,7 @@
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@@ -1543,10 +1448,6 @@
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@@ -1561,17 +1462,12 @@
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@@ -1586,8 +1482,7 @@
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@@ -1698,10 +1593,6 @@
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@@ -1716,17 +1607,12 @@
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@@ -1741,8 +1627,7 @@
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@@ -1853,10 +1738,6 @@
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@@ -1871,17 +1752,12 @@
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@@ -1896,8 +1772,7 @@
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@@ -2027,10 +1902,6 @@
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@@ -2045,17 +1916,12 @@
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@@ -2070,8 +1936,7 @@
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@@ -2201,10 +2066,6 @@
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@@ -2219,17 +2080,12 @@
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@@ -2244,8 +2100,7 @@
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@@ -2375,10 +2230,6 @@
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@@ -2393,17 +2244,12 @@
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@@ -2418,8 +2264,7 @@
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@@ -2568,10 +2413,6 @@
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@@ -2586,17 +2427,12 @@
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@@ -2611,8 +2447,7 @@
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@@ -2761,10 +2596,6 @@
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@@ -2779,17 +2610,12 @@
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@@ -2804,8 +2630,7 @@
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@@ -2954,10 +2779,6 @@
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@@ -2972,17 +2793,12 @@
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@@ -2997,8 +2813,7 @@
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@@ -3149,10 +2964,6 @@
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@@ -3167,17 +2978,12 @@
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@@ -3192,8 +2998,7 @@
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+            "g"
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@@ -3325,10 +3130,6 @@
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@@ -3343,17 +3144,12 @@
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@@ -3368,8 +3164,7 @@
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+            "g"
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@@ -3482,10 +3277,6 @@
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@@ -3500,17 +3291,12 @@
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@@ -3525,8 +3311,7 @@
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+            "g"
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@@ -3620,10 +3405,6 @@
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@@ -3638,17 +3419,12 @@
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@@ -3663,8 +3439,7 @@
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+            "g"
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@@ -3741,10 +3516,6 @@
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@@ -3759,17 +3530,12 @@
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@@ -3784,8 +3550,7 @@
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+            "g"
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@@ -3858,10 +3623,6 @@
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@@ -3876,17 +3637,12 @@
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@@ -3901,8 +3657,7 @@
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+            "g"
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@@ -3975,10 +3730,6 @@
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@@ -3993,17 +3744,12 @@
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@@ -4018,8 +3764,7 @@
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+            "g"
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@@ -4111,10 +3856,6 @@
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@@ -4129,17 +3870,12 @@
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@@ -4154,8 +3890,7 @@
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+            "g"
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@@ -4247,10 +3982,6 @@
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@@ -4265,17 +3996,12 @@
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@@ -4290,8 +4016,7 @@
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@@ -4383,10 +4108,6 @@
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@@ -4401,17 +4122,12 @@
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-          "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
+          "encoded_locals": {
             "x": 4, 
             "g": [
               "REF", 
@@ -4426,8 +4142,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -4538,10 +4253,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -4556,17 +4267,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -4581,8 +4287,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -4693,10 +4398,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -4711,17 +4412,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -4736,8 +4432,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -4848,10 +4543,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -4866,17 +4557,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -4891,8 +4577,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -5022,10 +4707,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -5040,17 +4721,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -5065,8 +4741,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -5196,10 +4871,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -5214,17 +4885,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -5239,8 +4905,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -5370,10 +5035,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -5388,17 +5049,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -5413,8 +5069,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -5563,10 +5218,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -5581,17 +5232,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -5606,8 +5252,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -5756,10 +5401,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -5774,17 +5415,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -5799,8 +5435,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -5949,10 +5584,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -5967,17 +5598,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -5992,8 +5618,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -6161,10 +5786,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -6179,17 +5800,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -6204,8 +5820,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -6373,10 +5988,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -6391,17 +6002,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -6416,8 +6022,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -6585,10 +6190,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -6603,17 +6204,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -6628,8 +6224,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -6799,10 +6394,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -6817,17 +6408,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -6842,8 +6428,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -6994,10 +6579,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -7012,17 +6593,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -7037,8 +6613,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -7170,10 +6745,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -7188,17 +6759,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -7213,8 +6779,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -7327,10 +6892,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -7345,17 +6906,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -7370,8 +6926,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -7465,10 +7020,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -7483,17 +7034,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -7508,8 +7054,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -7587,10 +7132,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              3
-            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -7605,17 +7146,12 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -7630,8 +7166,7 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }
       ], 
diff --git a/v3/example-code/closures/lambda-param.golden b/v3/example-code/closures/lambda-param.golden
index aaec15a9c..f15175aba 100644
--- a/v3/example-code/closures/lambda-param.golden
+++ b/v3/example-code/closures/lambda-param.golden
@@ -714,7 +714,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": null, 
             "x": 10
           }, 
           "is_highlighted": false, 
@@ -724,8 +723,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
diff --git a/v3/example-code/decorators.golden b/v3/example-code/decorators.golden
index 8b88ef0b2..ad72b89be 100644
--- a/v3/example-code/decorators.golden
+++ b/v3/example-code/decorators.golden
@@ -292,10 +292,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "fn": [
               "REF", 
               3
@@ -308,8 +304,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
@@ -377,10 +372,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "fn": [
               "REF", 
               3
@@ -393,8 +384,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
@@ -462,10 +452,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "fn": [
               "REF", 
               3
@@ -478,8 +464,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
@@ -558,10 +543,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "fn": [
               "REF", 
               3
@@ -574,17 +555,12 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "fn": [
               "REF", 
               4
@@ -597,8 +573,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }
       ], 
@@ -658,10 +633,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "fn": [
               "REF", 
               3
@@ -674,17 +645,12 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "fn": [
               "REF", 
               4
@@ -697,8 +663,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
@@ -771,10 +736,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "fn": [
               "REF", 
               3
@@ -787,17 +748,12 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "fn": [
               "REF", 
               4
@@ -810,8 +766,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
@@ -884,10 +839,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "fn": [
               "REF", 
               3
@@ -900,17 +851,12 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "fn": [
               "REF", 
               4
@@ -923,8 +869,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
@@ -1010,10 +955,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "fn": [
               "REF", 
               3
@@ -1026,17 +967,12 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "fn": [
               "REF", 
               4
@@ -1049,8 +985,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
@@ -1136,10 +1071,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "fn": [
               "REF", 
               3
@@ -1152,17 +1083,12 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "fn": [
               "REF", 
               4
@@ -1175,8 +1101,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
@@ -1273,10 +1198,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "fn": [
               "REF", 
               3
@@ -1289,17 +1210,12 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "fn": [
               "REF", 
               4
@@ -1312,8 +1228,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
@@ -1410,10 +1325,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "fn": [
               "REF", 
               3
@@ -1426,17 +1337,12 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "fn": [
               "REF", 
               4
@@ -1449,8 +1355,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
@@ -1551,10 +1456,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "fn": [
               "REF", 
               3
@@ -1567,17 +1468,12 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "fn": [
               "REF", 
               4
@@ -1590,8 +1486,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
@@ -1681,10 +1576,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "fn": [
               "REF", 
               3
@@ -1697,17 +1588,12 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "fn": [
               "REF", 
               4
@@ -1720,8 +1606,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
@@ -1799,10 +1684,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "fn": [
               "REF", 
               3
@@ -1815,17 +1696,12 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              5
-            ], 
             "fn": [
               "REF", 
               4
@@ -1838,8 +1714,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn", 
-            "__return__"
+            "fn"
           ]
         }
       ], 
diff --git a/v3/example-code/gen_primes.golden b/v3/example-code/gen_primes.golden
index 1792ebafa..d0cdadeb0 100644
--- a/v3/example-code/gen_primes.golden
+++ b/v3/example-code/gen_primes.golden
@@ -323,7 +323,6 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": 2, 
             "n": 2
           }, 
           "is_highlighted": true, 
@@ -333,8 +332,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "gen_primes_f2", 
           "ordered_varnames": [
-            "n", 
-            "__return__"
+            "n"
           ]
         }
       ], 
@@ -366,7 +364,6 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": 2, 
             "n": 2
           }, 
           "is_highlighted": true, 
@@ -376,8 +373,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "gen_primes_f2", 
           "ordered_varnames": [
-            "n", 
-            "__return__"
+            "n"
           ]
         }
       ], 
@@ -409,7 +405,6 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": 2, 
             "n": 3
           }, 
           "is_highlighted": true, 
@@ -419,8 +414,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "gen_primes_f2", 
           "ordered_varnames": [
-            "n", 
-            "__return__"
+            "n"
           ]
         }
       ], 
@@ -452,7 +446,6 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": 2, 
             "n": 3
           }, 
           "is_highlighted": true, 
@@ -462,8 +455,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "gen_primes_f2", 
           "ordered_varnames": [
-            "n", 
-            "__return__"
+            "n"
           ]
         }
       ], 
@@ -495,7 +487,6 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": 2, 
             "x": 2, 
             "n": 3
           }, 
@@ -507,8 +498,7 @@
           "unique_hash": "gen_primes_f2", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -540,7 +530,6 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": 2, 
             "x": 2, 
             "n": 3
           }, 
@@ -552,8 +541,7 @@
           "unique_hash": "gen_primes_f2", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -585,7 +573,6 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": 2, 
             "x": 2, 
             "n": 3
           }, 
@@ -597,8 +584,7 @@
           "unique_hash": "gen_primes_f2", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -725,7 +711,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 2, 
             "n": 3
           }, 
@@ -737,8 +722,7 @@
           "unique_hash": "gen_primes_f3", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -770,7 +754,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 2, 
             "n": 3
           }, 
@@ -782,8 +765,7 @@
           "unique_hash": "gen_primes_f3", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -815,7 +797,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 2, 
             "n": 4
           }, 
@@ -827,8 +808,7 @@
           "unique_hash": "gen_primes_f3", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -860,7 +840,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 2, 
             "n": 4
           }, 
@@ -872,8 +851,7 @@
           "unique_hash": "gen_primes_f3", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -905,7 +883,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 2, 
             "n": 4
           }, 
@@ -917,8 +894,7 @@
           "unique_hash": "gen_primes_f3", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -950,7 +926,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 2, 
             "n": 4
           }, 
@@ -962,8 +937,7 @@
           "unique_hash": "gen_primes_f3", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -995,7 +969,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 2, 
             "n": 4
           }, 
@@ -1007,8 +980,7 @@
           "unique_hash": "gen_primes_f3", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1040,7 +1012,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 2, 
             "n": 5
           }, 
@@ -1052,8 +1023,7 @@
           "unique_hash": "gen_primes_f3", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1085,7 +1055,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 2, 
             "n": 5
           }, 
@@ -1097,8 +1066,7 @@
           "unique_hash": "gen_primes_f3", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1130,7 +1098,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 2, 
             "n": 5
           }, 
@@ -1142,8 +1109,7 @@
           "unique_hash": "gen_primes_f3", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1175,7 +1141,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 2, 
             "n": 5
           }, 
@@ -1187,8 +1152,7 @@
           "unique_hash": "gen_primes_f3", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1220,7 +1184,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 3, 
             "n": 5
           }, 
@@ -1232,8 +1195,7 @@
           "unique_hash": "gen_primes_f3", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1265,7 +1227,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 3, 
             "n": 5
           }, 
@@ -1277,8 +1238,7 @@
           "unique_hash": "gen_primes_f3", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1310,7 +1270,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 4, 
             "n": 5
           }, 
@@ -1322,8 +1281,7 @@
           "unique_hash": "gen_primes_f3", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1355,7 +1313,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 4, 
             "n": 5
           }, 
@@ -1367,8 +1324,7 @@
           "unique_hash": "gen_primes_f3", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1400,7 +1356,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 4, 
             "n": 5
           }, 
@@ -1412,8 +1367,7 @@
           "unique_hash": "gen_primes_f3", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1540,7 +1494,6 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 5, 
             "x": 4, 
             "n": 5
           }, 
@@ -1552,8 +1505,7 @@
           "unique_hash": "gen_primes_f4", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1585,7 +1537,6 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 5, 
             "x": 4, 
             "n": 5
           }, 
@@ -1597,8 +1548,7 @@
           "unique_hash": "gen_primes_f4", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1630,7 +1580,6 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 5, 
             "x": 4, 
             "n": 6
           }, 
@@ -1642,8 +1591,7 @@
           "unique_hash": "gen_primes_f4", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1675,7 +1623,6 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 5, 
             "x": 4, 
             "n": 6
           }, 
@@ -1687,8 +1634,7 @@
           "unique_hash": "gen_primes_f4", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1720,7 +1666,6 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 5, 
             "x": 2, 
             "n": 6
           }, 
@@ -1732,8 +1677,7 @@
           "unique_hash": "gen_primes_f4", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1765,7 +1709,6 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 5, 
             "x": 2, 
             "n": 6
           }, 
@@ -1777,8 +1720,7 @@
           "unique_hash": "gen_primes_f4", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1810,7 +1752,6 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 5, 
             "x": 2, 
             "n": 6
           }, 
@@ -1822,8 +1763,7 @@
           "unique_hash": "gen_primes_f4", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1855,7 +1795,6 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 5, 
             "x": 2, 
             "n": 7
           }, 
@@ -1867,8 +1806,7 @@
           "unique_hash": "gen_primes_f4", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1900,7 +1838,6 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 5, 
             "x": 2, 
             "n": 7
           }, 
@@ -1912,8 +1849,7 @@
           "unique_hash": "gen_primes_f4", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1945,7 +1881,6 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 5, 
             "x": 2, 
             "n": 7
           }, 
@@ -1957,8 +1892,7 @@
           "unique_hash": "gen_primes_f4", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1990,7 +1924,6 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 5, 
             "x": 2, 
             "n": 7
           }, 
@@ -2002,8 +1935,7 @@
           "unique_hash": "gen_primes_f4", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -2035,7 +1967,6 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 5, 
             "x": 3, 
             "n": 7
           }, 
@@ -2047,8 +1978,7 @@
           "unique_hash": "gen_primes_f4", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -2080,7 +2010,6 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 5, 
             "x": 3, 
             "n": 7
           }, 
@@ -2092,8 +2021,7 @@
           "unique_hash": "gen_primes_f4", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -2125,7 +2053,6 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 5, 
             "x": 4, 
             "n": 7
           }, 
@@ -2137,8 +2064,7 @@
           "unique_hash": "gen_primes_f4", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -2170,7 +2096,6 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 5, 
             "x": 4, 
             "n": 7
           }, 
@@ -2182,8 +2107,7 @@
           "unique_hash": "gen_primes_f4", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -2215,7 +2139,6 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "__return__": 5, 
             "x": 5, 
             "n": 7
           }, 
@@ -2227,8 +2150,7 @@
           "unique_hash": "gen_primes_f4", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -2260,7 +2182,6 @@
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@@ -2272,8 +2193,7 @@
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@@ -2305,7 +2225,6 @@
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@@ -2317,8 +2236,7 @@
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@@ -2350,7 +2268,6 @@
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@@ -2362,8 +2279,7 @@
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@@ -2395,7 +2311,6 @@
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@@ -2407,8 +2322,7 @@
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@@ -2535,7 +2449,6 @@
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@@ -2547,8 +2460,7 @@
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@@ -2580,7 +2492,6 @@
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@@ -2592,8 +2503,7 @@
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@@ -2625,7 +2535,6 @@
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@@ -2637,8 +2546,7 @@
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@@ -2682,8 +2589,7 @@
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@@ -2715,7 +2621,6 @@
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@@ -2727,8 +2632,7 @@
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@@ -2760,7 +2664,6 @@
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@@ -2772,8 +2675,7 @@
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@@ -2805,7 +2707,6 @@
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@@ -2817,8 +2718,7 @@
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@@ -2850,7 +2750,6 @@
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@@ -2862,8 +2761,7 @@
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@@ -2895,7 +2793,6 @@
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@@ -2907,8 +2804,7 @@
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@@ -2940,7 +2836,6 @@
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@@ -2952,8 +2847,7 @@
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@@ -2985,7 +2879,6 @@
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@@ -2997,8 +2890,7 @@
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@@ -3030,7 +2922,6 @@
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@@ -3042,8 +2933,7 @@
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@@ -3075,7 +2965,6 @@
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@@ -3087,8 +2976,7 @@
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@@ -3120,7 +3008,6 @@
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@@ -3132,8 +3019,7 @@
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@@ -3165,7 +3051,6 @@
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@@ -3177,8 +3062,7 @@
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@@ -3210,7 +3094,6 @@
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@@ -3222,8 +3105,7 @@
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@@ -3255,7 +3137,6 @@
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@@ -3267,8 +3148,7 @@
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@@ -3300,7 +3180,6 @@
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@@ -3312,8 +3191,7 @@
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@@ -3345,7 +3223,6 @@
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@@ -3357,8 +3234,7 @@
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@@ -3390,7 +3266,6 @@
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@@ -3402,8 +3277,7 @@
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@@ -3435,7 +3309,6 @@
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@@ -3447,8 +3320,7 @@
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@@ -3480,7 +3352,6 @@
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@@ -3492,8 +3363,7 @@
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@@ -3525,7 +3395,6 @@
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@@ -3537,8 +3406,7 @@
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@@ -3570,7 +3438,6 @@
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@@ -3582,8 +3449,7 @@
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@@ -3615,7 +3481,6 @@
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@@ -3627,8 +3492,7 @@
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@@ -3660,7 +3524,6 @@
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@@ -3672,8 +3535,7 @@
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@@ -3705,7 +3567,6 @@
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@@ -3717,8 +3578,7 @@
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@@ -3750,7 +3610,6 @@
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@@ -3762,8 +3621,7 @@
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@@ -3795,7 +3653,6 @@
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@@ -3807,8 +3664,7 @@
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@@ -3840,7 +3696,6 @@
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@@ -3852,8 +3707,7 @@
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@@ -3885,7 +3739,6 @@
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@@ -3897,8 +3750,7 @@
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@@ -3930,7 +3782,6 @@
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@@ -3942,8 +3793,7 @@
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@@ -3975,7 +3825,6 @@
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@@ -3987,8 +3836,7 @@
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@@ -4020,7 +3868,6 @@
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@@ -4032,8 +3879,7 @@
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@@ -4065,7 +3911,6 @@
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@@ -4077,8 +3922,7 @@
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@@ -4110,7 +3954,6 @@
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@@ -4122,8 +3965,7 @@
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@@ -4155,7 +3997,6 @@
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@@ -4167,8 +4008,7 @@
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@@ -4200,7 +4040,6 @@
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@@ -4212,8 +4051,7 @@
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@@ -4245,7 +4083,6 @@
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@@ -4257,8 +4094,7 @@
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@@ -4290,7 +4126,6 @@
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@@ -4302,8 +4137,7 @@
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@@ -4430,7 +4264,6 @@
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@@ -4442,8 +4275,7 @@
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@@ -4475,7 +4307,6 @@
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@@ -4487,8 +4318,7 @@
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@@ -4520,7 +4350,6 @@
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@@ -4532,8 +4361,7 @@
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@@ -4565,7 +4393,6 @@
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@@ -4577,8 +4404,7 @@
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@@ -4610,7 +4436,6 @@
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@@ -4622,8 +4447,7 @@
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@@ -4655,7 +4479,6 @@
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@@ -4667,8 +4490,7 @@
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@@ -4700,7 +4522,6 @@
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@@ -4712,8 +4533,7 @@
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@@ -4745,7 +4565,6 @@
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@@ -4757,8 +4576,7 @@
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@@ -4790,7 +4608,6 @@
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@@ -4802,8 +4619,7 @@
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@@ -4835,7 +4651,6 @@
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@@ -4847,8 +4662,7 @@
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@@ -4880,7 +4694,6 @@
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@@ -4892,8 +4705,7 @@
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@@ -4937,8 +4748,7 @@
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@@ -4982,8 +4791,7 @@
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@@ -5027,8 +4834,7 @@
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@@ -5072,8 +4877,7 @@
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@@ -5162,8 +4963,7 @@
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@@ -5207,8 +5006,7 @@
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@@ -5252,8 +5049,7 @@
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@@ -5297,8 +5092,7 @@
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@@ -5342,8 +5135,7 @@
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@@ -5432,8 +5221,7 @@
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@@ -5477,8 +5264,7 @@
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@@ -5522,8 +5307,7 @@
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@@ -5567,8 +5350,7 @@
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@@ -5612,8 +5393,7 @@
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@@ -5657,8 +5436,7 @@
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@@ -5747,8 +5522,7 @@
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@@ -6022,8 +5789,7 @@
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@@ -6067,8 +5832,7 @@
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@@ -6112,8 +5875,7 @@
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@@ -6202,8 +5961,7 @@
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@@ -6652,8 +6391,7 @@
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@@ -6697,8 +6434,7 @@
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@@ -6730,7 +6466,6 @@
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@@ -6742,8 +6477,7 @@
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@@ -6787,8 +6520,7 @@
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@@ -6877,8 +6606,7 @@
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@@ -7057,8 +6778,7 @@
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@@ -7102,8 +6821,7 @@
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@@ -7135,7 +6853,6 @@
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@@ -7147,8 +6864,7 @@
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@@ -7192,8 +6907,7 @@
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@@ -7237,8 +6950,7 @@
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@@ -7270,7 +6982,6 @@
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@@ -7282,8 +6993,7 @@
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@@ -7327,8 +7036,7 @@
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@@ -7360,7 +7068,6 @@
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@@ -7372,8 +7079,7 @@
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@@ -7405,7 +7111,6 @@
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@@ -7417,8 +7122,7 @@
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@@ -12332,8 +11827,7 @@
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@@ -12377,8 +11870,7 @@
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@@ -12467,8 +11956,7 @@
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@@ -12512,8 +11999,7 @@
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@@ -12545,7 +12031,6 @@
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           "frame_id": 9, 
           "encoded_locals": {
-            "__return__": 19, 
             "x": 14, 
             "n": 23
           }, 
@@ -12557,8 +12042,7 @@
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           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -12590,7 +12074,6 @@
         {
           "frame_id": 9, 
           "encoded_locals": {
-            "__return__": 19, 
             "x": 15, 
             "n": 23
           }, 
@@ -12602,8 +12085,7 @@
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           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -12635,7 +12117,6 @@
         {
           "frame_id": 9, 
           "encoded_locals": {
-            "__return__": 19, 
             "x": 15, 
             "n": 23
           }, 
@@ -12647,8 +12128,7 @@
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           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -12680,7 +12160,6 @@
         {
           "frame_id": 9, 
           "encoded_locals": {
-            "__return__": 19, 
             "x": 16, 
             "n": 23
           }, 
@@ -12692,8 +12171,7 @@
           "unique_hash": "gen_primes_f9", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -12725,7 +12203,6 @@
         {
           "frame_id": 9, 
           "encoded_locals": {
-            "__return__": 19, 
             "x": 16, 
             "n": 23
           }, 
@@ -12737,8 +12214,7 @@
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           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -12770,7 +12246,6 @@
         {
           "frame_id": 9, 
           "encoded_locals": {
-            "__return__": 19, 
             "x": 17, 
             "n": 23
           }, 
@@ -12782,8 +12257,7 @@
           "unique_hash": "gen_primes_f9", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -12815,7 +12289,6 @@
         {
           "frame_id": 9, 
           "encoded_locals": {
-            "__return__": 19, 
             "x": 17, 
             "n": 23
           }, 
@@ -12827,8 +12300,7 @@
           "unique_hash": "gen_primes_f9", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -12860,7 +12332,6 @@
         {
           "frame_id": 9, 
           "encoded_locals": {
-            "__return__": 19, 
             "x": 18, 
             "n": 23
           }, 
@@ -12872,8 +12343,7 @@
           "unique_hash": "gen_primes_f9", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -12905,7 +12375,6 @@
         {
           "frame_id": 9, 
           "encoded_locals": {
-            "__return__": 19, 
             "x": 18, 
             "n": 23
           }, 
@@ -12917,8 +12386,7 @@
           "unique_hash": "gen_primes_f9", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -12950,7 +12418,6 @@
         {
           "frame_id": 9, 
           "encoded_locals": {
-            "__return__": 19, 
             "x": 19, 
             "n": 23
           }, 
@@ -12962,8 +12429,7 @@
           "unique_hash": "gen_primes_f9", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -12995,7 +12461,6 @@
         {
           "frame_id": 9, 
           "encoded_locals": {
-            "__return__": 19, 
             "x": 19, 
             "n": 23
           }, 
@@ -13007,8 +12472,7 @@
           "unique_hash": "gen_primes_f9", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -13040,7 +12504,6 @@
         {
           "frame_id": 9, 
           "encoded_locals": {
-            "__return__": 19, 
             "x": 20, 
             "n": 23
           }, 
@@ -13052,8 +12515,7 @@
           "unique_hash": "gen_primes_f9", 
           "ordered_varnames": [
             "n", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
diff --git a/v3/example-code/linked-lists/ll2.golden b/v3/example-code/linked-lists/ll2.golden
index 6437333ed..3e52ba4a4 100644
--- a/v3/example-code/linked-lists/ll2.golden
+++ b/v3/example-code/linked-lists/ll2.golden
@@ -1324,10 +1324,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              7
-            ], 
             "__init__": [
               "REF", 
               8
@@ -1340,8 +1336,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
           ]
         }
       ], 
@@ -1438,20 +1433,6 @@
             ]
           ]
         ], 
-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              8
-            ]
-          ]
-        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -1486,10 +1467,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              7
-            ], 
             "__init__": [
               "REF", 
               8
@@ -1502,8 +1479,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
           ]
         }
       ], 
@@ -1601,20 +1577,6 @@
             ]
           ]
         ], 
-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              8
-            ]
-          ]
-        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -1649,10 +1611,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              7
-            ], 
             "__init__": [
               "REF", 
               8
@@ -1665,8 +1623,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
           ]
         }
       ], 
@@ -1764,20 +1721,6 @@
             ]
           ]
         ], 
-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              8
-            ]
-          ]
-        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -1812,10 +1755,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              7
-            ], 
             "__init__": [
               "REF", 
               8
@@ -1828,8 +1767,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
           ]
         }, 
         {
@@ -1951,20 +1889,6 @@
             ]
           ]
         ], 
-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              8
-            ]
-          ]
-        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -2003,10 +1927,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              7
-            ], 
             "__init__": [
               "REF", 
               8
@@ -2019,8 +1939,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
           ]
         }, 
         {
@@ -2142,20 +2061,6 @@
             ]
           ]
         ], 
-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              8
-            ]
-          ]
-        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -2194,10 +2099,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              7
-            ], 
             "__init__": [
               "REF", 
               8
@@ -2210,8 +2111,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
           ]
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         {
@@ -2333,20 +2233,6 @@
             ]
           ]
         ], 
-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              8
-            ]
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-        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -2389,10 +2275,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              7
-            ], 
             "__init__": [
               "REF", 
               8
@@ -2405,8 +2287,7 @@
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           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
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         {
@@ -2530,20 +2411,6 @@
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           ]
         ], 
-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              8
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         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -2590,10 +2457,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
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-              7
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               8
@@ -2606,8 +2469,7 @@
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           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
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         }
       ], 
@@ -2708,20 +2570,6 @@
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           ]
         ], 
-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              8
-            ]
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-        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -2768,10 +2616,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              7
-            ], 
             "__init__": [
               "REF", 
               8
@@ -2784,8 +2628,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
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       ], 
@@ -2886,20 +2729,6 @@
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-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
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-          [
-            "__init__", 
-            [
-              "REF", 
-              8
-            ]
-          ]
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         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -2946,10 +2775,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              7
-            ], 
             "__init__": [
               "REF", 
               8
@@ -2962,8 +2787,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
           ]
         }, 
         {
@@ -3091,20 +2915,6 @@
             ]
           ]
         ], 
-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              8
-            ]
-          ]
-        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -3155,10 +2965,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              7
-            ], 
             "__init__": [
               "REF", 
               8
@@ -3171,8 +2977,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
           ]
         }, 
         {
@@ -3300,20 +3105,6 @@
             ]
           ]
         ], 
-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              8
-            ]
-          ]
-        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -3364,10 +3155,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              7
-            ], 
             "__init__": [
               "REF", 
               8
@@ -3380,8 +3167,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
           ]
         }, 
         {
@@ -3509,20 +3295,6 @@
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           ]
         ], 
-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              8
-            ]
-          ]
-        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -3577,10 +3349,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              7
-            ], 
             "__init__": [
               "REF", 
               8
@@ -3593,8 +3361,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
           ]
         }, 
         {
@@ -3724,20 +3491,6 @@
             ]
           ]
         ], 
-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              8
-            ]
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-        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -3799,10 +3552,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              7
-            ], 
             "__init__": [
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               8
@@ -3815,8 +3564,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
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         }
       ], 
@@ -3917,20 +3665,6 @@
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           ]
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-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              8
-            ]
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-        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -3992,10 +3726,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              7
-            ], 
             "__init__": [
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               8
@@ -4008,8 +3738,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
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         }
       ], 
@@ -4110,20 +3839,6 @@
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           ]
         ], 
-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              8
-            ]
-          ]
-        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -4185,10 +3900,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              7
-            ], 
             "__init__": [
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               8
@@ -4201,8 +3912,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
           ]
         }, 
         {
@@ -4330,20 +4040,6 @@
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           ]
         ], 
-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
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-          [
-            "__init__", 
-            [
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-              8
-            ]
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         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -4409,10 +4105,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              7
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             "__init__": [
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               8
@@ -4425,8 +4117,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
           ]
         }, 
         {
@@ -4554,20 +4245,6 @@
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           ]
         ], 
-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
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-          [
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-            [
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-              8
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         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -4633,10 +4310,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              7
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               8
@@ -4649,8 +4322,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
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         {
@@ -4778,20 +4450,6 @@
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           ]
         ], 
-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
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-          [
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-            [
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-              8
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         "8": [
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           "__init__(self, data, next)", 
@@ -4861,10 +4519,6 @@
         {
           "frame_id": 1, 
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-            "__return__": [
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@@ -4877,8 +4531,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
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         {
@@ -5008,20 +4661,6 @@
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-        "7": [
-          "DICT", 
-          [
-            "__doc__", 
-            null
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-          [
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-            [
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-              8
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         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -5098,10 +4737,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
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@@ -5114,8 +4749,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__", 
-            "__return__"
+            "__init__"
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@@ -5216,20 +4850,6 @@
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-          [
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-            null
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-          [
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-            [
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@@ -5424,20 +5039,6 @@
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@@ -5530,8 +5127,7 @@
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@@ -5659,20 +5255,6 @@
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@@ -5753,10 +5335,6 @@
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@@ -5769,8 +5347,7 @@
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@@ -5898,20 +5475,6 @@
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@@ -6008,8 +5567,7 @@
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@@ -6137,20 +5695,6 @@
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@@ -6251,8 +5791,7 @@
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@@ -6591,31 +6111,17 @@
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+            1
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+            "next", 
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@@ -6710,10 +6216,6 @@
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@@ -6726,8 +6228,7 @@
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@@ -6828,20 +6329,6 @@
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@@ -6933,10 +6420,6 @@
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@@ -6949,8 +6432,7 @@
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@@ -7078,20 +6560,6 @@
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@@ -7187,10 +6655,6 @@
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@@ -7203,8 +6667,7 @@
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@@ -7332,20 +6795,6 @@
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@@ -7441,10 +6890,6 @@
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@@ -7457,8 +6902,7 @@
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@@ -7586,20 +7030,6 @@
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@@ -7699,10 +7129,6 @@
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@@ -7715,8 +7141,7 @@
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@@ -7846,20 +7271,6 @@
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@@ -7966,10 +7377,6 @@
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@@ -7982,8 +7389,7 @@
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@@ -8084,20 +7490,6 @@
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@@ -8204,10 +7596,6 @@
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@@ -8220,8 +7608,7 @@
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@@ -8322,20 +7709,6 @@
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@@ -8442,10 +7815,6 @@
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@@ -8458,8 +7827,7 @@
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@@ -8587,20 +7955,6 @@
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@@ -8711,10 +8065,6 @@
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@@ -8727,8 +8077,7 @@
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@@ -8856,20 +8205,6 @@
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@@ -8980,10 +8315,6 @@
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@@ -8996,8 +8327,7 @@
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@@ -9125,20 +8455,6 @@
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@@ -9253,10 +8569,6 @@
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@@ -9269,8 +8581,7 @@
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@@ -9400,20 +8711,6 @@
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@@ -9535,10 +8832,6 @@
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@@ -9551,8 +8844,7 @@
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@@ -9653,20 +8945,6 @@
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@@ -9788,10 +9066,6 @@
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@@ -9804,8 +9078,7 @@
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@@ -9906,20 +9179,6 @@
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diff --git a/v3/example-code/map.golden b/v3/example-code/map.golden
index e0181c7ec..ea180d541 100644
--- a/v3/example-code/map.golden
+++ b/v3/example-code/map.golden
@@ -6879,10 +6879,6 @@
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@@ -6895,8 +6891,7 @@
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+            "lst"
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diff --git a/v3/example-code/oop_1.golden b/v3/example-code/oop_1.golden
index c6febe7f9..6afd13b48 100644
--- a/v3/example-code/oop_1.golden
+++ b/v3/example-code/oop_1.golden
@@ -245,11 +245,7 @@
               "REF", 
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-            "room": 501, 
-            "__return__": [
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@@ -261,8 +257,7 @@
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+            "salutation"
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@@ -278,32 +273,6 @@
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@@ -349,11 +318,7 @@
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@@ -365,8 +330,7 @@
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@@ -386,32 +350,6 @@
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@@ -461,11 +399,7 @@
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@@ -477,8 +411,7 @@
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@@ -498,32 +431,6 @@
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@@ -573,11 +480,7 @@
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@@ -589,8 +492,7 @@
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+            "salutation"
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@@ -610,32 +512,6 @@
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@@ -689,11 +565,7 @@
               "REF", 
               1
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-            "__return__": [
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@@ -705,8 +577,7 @@
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@@ -726,32 +597,6 @@
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-            501
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-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -809,11 +654,7 @@
               "REF", 
               1
             ], 
-            "room": 501, 
-            "__return__": [
-              "REF", 
-              2
-            ]
+            "room": 501
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -825,8 +666,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }
       ], 
@@ -846,32 +686,6 @@
           "salutation(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -933,11 +747,7 @@
               "REF", 
               1
             ], 
-            "room": 501, 
-            "__return__": [
-              "REF", 
-              2
-            ]
+            "room": 501
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -949,8 +759,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }
       ], 
@@ -970,32 +779,6 @@
           "salutation(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1057,11 +840,7 @@
               "REF", 
               1
             ], 
-            "room": 501, 
-            "__return__": [
-              "REF", 
-              2
-            ]
+            "room": 501
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -1073,8 +852,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }
       ], 
@@ -1094,32 +872,6 @@
           "salutation(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1185,11 +937,7 @@
               "REF", 
               1
             ], 
-            "room": 501, 
-            "__return__": [
-              "REF", 
-              2
-            ]
+            "room": 501
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -1201,8 +949,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }
       ], 
@@ -1222,32 +969,6 @@
           "salutation(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1313,11 +1034,7 @@
               "REF", 
               1
             ], 
-            "room": 501, 
-            "__return__": [
-              "REF", 
-              2
-            ]
+            "room": 501
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -1329,8 +1046,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -1370,32 +1086,6 @@
           "salutation(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1461,11 +1151,7 @@
               "REF", 
               1
             ], 
-            "room": 501, 
-            "__return__": [
-              "REF", 
-              2
-            ]
+            "room": 501
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -1477,8 +1163,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -1518,32 +1203,6 @@
           "salutation(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1609,11 +1268,7 @@
               "REF", 
               1
             ], 
-            "room": 501, 
-            "__return__": [
-              "REF", 
-              2
-            ]
+            "room": 501
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -1625,8 +1280,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -1668,32 +1322,6 @@
           "salutation(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1759,11 +1387,7 @@
               "REF", 
               1
             ], 
-            "room": 501, 
-            "__return__": [
-              "REF", 
-              2
-            ]
+            "room": 501
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -1775,8 +1399,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }
       ], 
@@ -1796,32 +1419,6 @@
           "salutation(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1887,11 +1484,7 @@
               "REF", 
               1
             ], 
-            "room": 501, 
-            "__return__": [
-              "REF", 
-              2
-            ]
+            "room": 501
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -1903,8 +1496,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -1944,32 +1536,6 @@
           "salutation(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -2035,11 +1601,7 @@
               "REF", 
               1
             ], 
-            "room": 501, 
-            "__return__": [
-              "REF", 
-              2
-            ]
+            "room": 501
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -2051,8 +1613,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -2092,32 +1653,6 @@
           "salutation(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -2183,11 +1718,7 @@
               "REF", 
               1
             ], 
-            "room": 501, 
-            "__return__": [
-              "REF", 
-              2
-            ]
+            "room": 501
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -2199,8 +1730,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -2242,32 +1772,6 @@
           "salutation(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -2333,11 +1837,7 @@
               "REF", 
               1
             ], 
-            "room": 501, 
-            "__return__": [
-              "REF", 
-              2
-            ]
+            "room": 501
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -2349,8 +1849,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }
       ], 
@@ -2370,32 +1869,6 @@
           "salutation(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
diff --git a/v3/example-code/oop_2.golden b/v3/example-code/oop_2.golden
index a62b91d30..825326127 100644
--- a/v3/example-code/oop_2.golden
+++ b/v3/example-code/oop_2.golden
@@ -298,16 +298,12 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
-            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
+            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -324,8 +320,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }
       ], 
@@ -346,39 +341,6 @@
           "salutation(self)", 
           1
         ], 
-        "3": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              2
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -425,16 +387,12 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
-            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
+            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -451,8 +409,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -501,39 +458,6 @@
           "salutation(self)", 
           1
         ], 
-        "3": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              2
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -584,16 +508,12 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
-            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
+            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -610,8 +530,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -660,39 +579,6 @@
           "salutation(self)", 
           1
         ], 
-        "3": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              2
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -743,16 +629,12 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
-            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
+            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -769,8 +651,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -819,39 +700,6 @@
           "salutation(self)", 
           1
         ], 
-        "3": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              2
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -906,16 +754,12 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
-            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
+            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -932,8 +776,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -982,39 +825,6 @@
           "salutation(self)", 
           1
         ], 
-        "3": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              2
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -1073,16 +883,12 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
-            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
+            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -1099,8 +905,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -1149,39 +954,6 @@
           "salutation(self)", 
           1
         ], 
-        "3": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              2
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -1244,16 +1016,12 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
-            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
+            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -1270,8 +1038,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -1322,39 +1089,6 @@
           "salutation(self)", 
           1
         ], 
-        "3": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              2
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -1422,16 +1156,12 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
-            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
+            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -1448,8 +1178,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }
       ], 
@@ -1474,39 +1203,6 @@
           "salutation(self)", 
           1
         ], 
-        "3": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              2
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -1574,16 +1270,12 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
-            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
+            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -1600,8 +1292,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -1646,39 +1337,6 @@
           "salutation(self)", 
           1
         ], 
-        "3": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              2
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -1746,16 +1404,12 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
-            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
+            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -1772,8 +1426,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -1818,39 +1471,6 @@
           "salutation(self)", 
           1
         ], 
-        "3": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              2
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -1918,16 +1538,12 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
-            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
+            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -1944,8 +1560,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -1992,39 +1607,6 @@
           "salutation(self)", 
           1
         ], 
-        "3": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              2
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -2092,16 +1674,12 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
-            "__return__": [
-              "REF", 
-              3
-            ], 
-            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
+            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -2118,8 +1696,7 @@
             "building", 
             "course", 
             "room", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }
       ], 
@@ -2144,39 +1721,6 @@
           "salutation(self)", 
           1
         ], 
-        "3": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              2
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "4": [
           "CLASS", 
           "Staff601", 
diff --git a/v3/example-code/oop_inherit.golden b/v3/example-code/oop_inherit.golden
index 8b3640434..50bd66a66 100644
--- a/v3/example-code/oop_inherit.golden
+++ b/v3/example-code/oop_inherit.golden
@@ -241,10 +241,6 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "giveRaise": [
               "REF", 
               1
@@ -261,8 +257,7 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room", 
-            "__return__"
+            "room"
           ]
         }
       ], 
@@ -278,32 +273,6 @@
           "giveRaise(self, percentage)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "giveRaise", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -344,10 +313,6 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "giveRaise": [
               "REF", 
               1
@@ -364,8 +329,7 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room", 
-            "__return__"
+            "room"
           ]
         }, 
         {
@@ -392,32 +356,6 @@
           "giveRaise(self, percentage)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "giveRaise", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -458,10 +396,6 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "giveRaise": [
               "REF", 
               1
@@ -478,8 +412,7 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room", 
-            "__return__"
+            "room"
           ]
         }, 
         {
@@ -506,32 +439,6 @@
           "giveRaise(self, percentage)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "giveRaise", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -572,10 +479,6 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "giveRaise": [
               "REF", 
               1
@@ -592,8 +495,7 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room", 
-            "__return__"
+            "room"
           ]
         }, 
         {
@@ -620,32 +522,6 @@
           "giveRaise(self, percentage)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "giveRaise", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -686,10 +562,6 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "giveRaise": [
               "REF", 
               1
@@ -706,8 +578,7 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room", 
-            "__return__"
+            "room"
           ]
         }, 
         {
@@ -738,32 +609,6 @@
           "giveRaise(self, percentage)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "giveRaise", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -804,10 +649,6 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "giveRaise": [
               "REF", 
               1
@@ -824,8 +665,7 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room", 
-            "__return__"
+            "room"
           ]
         }, 
         {
@@ -861,32 +701,6 @@
           "giveRaise(self, percentage)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "giveRaise", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -932,10 +746,6 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "giveRaise": [
               "REF", 
               1
@@ -952,8 +762,7 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room", 
-            "__return__"
+            "room"
           ]
         }, 
         {
@@ -999,32 +808,6 @@
           "giveRaise(self, percentage)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "giveRaise", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1097,10 +880,6 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "giveRaise": [
               "REF", 
               1
@@ -1117,18 +896,13 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room", 
-            "__return__"
+            "room"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
-            "__return__": [
-              "REF", 
-              6
-            ], 
             "salutation": [
               "REF", 
               5
@@ -1147,8 +921,7 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }
       ], 
@@ -1168,32 +941,6 @@
           "giveRaise(self, percentage)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "giveRaise", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1228,31 +975,6 @@
           "salutation(self)", 
           2
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salary", 
-            100000
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              4
-            ]
-          ]
-        ], 
         "7": [
           "CLASS", 
           "Prof601", 
@@ -1295,10 +1017,6 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "giveRaise": [
               "REF", 
               1
@@ -1315,18 +1033,13 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room", 
-            "__return__"
+            "room"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
-            "__return__": [
-              "REF", 
-              6
-            ], 
             "salutation": [
               "REF", 
               5
@@ -1345,8 +1058,7 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -1390,32 +1102,6 @@
           "giveRaise(self, percentage)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "giveRaise", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1450,31 +1136,6 @@
           "salutation(self)", 
           2
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salary", 
-            100000
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              4
-            ]
-          ]
-        ], 
         "7": [
           "CLASS", 
           "Prof601", 
@@ -1521,10 +1182,6 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "giveRaise": [
               "REF", 
               1
@@ -1541,18 +1198,13 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room", 
-            "__return__"
+            "room"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
-            "__return__": [
-              "REF", 
-              6
-            ], 
             "salutation": [
               "REF", 
               5
@@ -1571,8 +1223,7 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -1616,32 +1267,6 @@
           "giveRaise(self, percentage)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "giveRaise", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1676,31 +1301,6 @@
           "salutation(self)", 
           2
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salary", 
-            100000
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              4
-            ]
-          ]
-        ], 
         "7": [
           "CLASS", 
           "Prof601", 
@@ -1747,10 +1347,6 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "giveRaise": [
               "REF", 
               1
@@ -1767,18 +1363,13 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room", 
-            "__return__"
+            "room"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
-            "__return__": [
-              "REF", 
-              6
-            ], 
             "salutation": [
               "REF", 
               5
@@ -1797,8 +1388,7 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -1842,32 +1432,6 @@
           "giveRaise(self, percentage)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "giveRaise", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1902,31 +1466,6 @@
           "salutation(self)", 
           2
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salary", 
-            100000
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              4
-            ]
-          ]
-        ], 
         "7": [
           "CLASS", 
           "Prof601", 
@@ -1977,10 +1516,6 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "giveRaise": [
               "REF", 
               1
@@ -1997,18 +1532,13 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room", 
-            "__return__"
+            "room"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
-            "__return__": [
-              "REF", 
-              6
-            ], 
             "salutation": [
               "REF", 
               5
@@ -2027,8 +1557,7 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -2094,32 +1623,6 @@
           "giveRaise(self, percentage)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "giveRaise", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -2154,31 +1657,6 @@
           "salutation(self)", 
           2
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salary", 
-            100000
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              4
-            ]
-          ]
-        ], 
         "7": [
           "CLASS", 
           "Prof601", 
@@ -2229,10 +1707,6 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "giveRaise": [
               "REF", 
               1
@@ -2249,18 +1723,13 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room", 
-            "__return__"
+            "room"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
-            "__return__": [
-              "REF", 
-              6
-            ], 
             "salutation": [
               "REF", 
               5
@@ -2279,8 +1748,7 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -2346,32 +1814,6 @@
           "giveRaise(self, percentage)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "giveRaise", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -2406,31 +1848,6 @@
           "salutation(self)", 
           2
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salary", 
-            100000
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              4
-            ]
-          ]
-        ], 
         "7": [
           "CLASS", 
           "Prof601", 
@@ -2481,10 +1898,6 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "giveRaise": [
               "REF", 
               1
@@ -2501,18 +1914,13 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room", 
-            "__return__"
+            "room"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
-            "__return__": [
-              "REF", 
-              6
-            ], 
             "salutation": [
               "REF", 
               5
@@ -2531,8 +1939,7 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -2600,32 +2007,6 @@
           "giveRaise(self, percentage)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "giveRaise", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -2660,31 +2041,6 @@
           "salutation(self)", 
           2
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salary", 
-            100000
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              4
-            ]
-          ]
-        ], 
         "7": [
           "CLASS", 
           "Prof601", 
@@ -2739,10 +2095,6 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "giveRaise": [
               "REF", 
               1
@@ -2759,18 +2111,13 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room", 
-            "__return__"
+            "room"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
-            "__return__": [
-              "REF", 
-              6
-            ], 
             "salutation": [
               "REF", 
               5
@@ -2789,8 +2136,7 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -2836,32 +2182,6 @@
           "giveRaise(self, percentage)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "giveRaise", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -2896,31 +2216,6 @@
           "salutation(self)", 
           2
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salary", 
-            100000
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              4
-            ]
-          ]
-        ], 
         "7": [
           "CLASS", 
           "Prof601", 
@@ -2976,10 +2271,6 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "giveRaise": [
               "REF", 
               1
@@ -2996,18 +2287,13 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room", 
-            "__return__"
+            "room"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
-            "__return__": [
-              "REF", 
-              6
-            ], 
             "salutation": [
               "REF", 
               5
@@ -3026,8 +2312,7 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }
       ], 
@@ -3051,32 +2336,6 @@
           "giveRaise(self, percentage)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "building", 
-            34
-          ], 
-          [
-            "giveRaise", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "room", 
-            501
-          ], 
-          [
-            "course", 
-            "6.01"
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -3111,31 +2370,6 @@
           "salutation(self)", 
           2
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salary", 
-            100000
-          ], 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              4
-            ]
-          ]
-        ], 
         "7": [
           "CLASS", 
           "Prof601", 
diff --git a/v3/example-code/oop_small.golden b/v3/example-code/oop_small.golden
index 53cc18a79..7187af575 100644
--- a/v3/example-code/oop_small.golden
+++ b/v3/example-code/oop_small.golden
@@ -682,10 +682,6 @@
             "salutation": [
               "REF", 
               5
-            ], 
-            "__return__": [
-              "REF", 
-              6
             ]
           }, 
           "is_highlighted": false, 
@@ -695,8 +691,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }
       ], 
@@ -742,20 +737,6 @@
           "salutation(self)", 
           3
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -791,10 +772,6 @@
             "salutation": [
               "REF", 
               5
-            ], 
-            "__return__": [
-              "REF", 
-              6
             ]
           }, 
           "is_highlighted": false, 
@@ -804,8 +781,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }
       ], 
@@ -828,6 +804,10 @@
         ]
       }, 
       "heap": {
+        "8": [
+          "INSTANCE", 
+          "C"
+        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -855,20 +835,6 @@
           "salutation(self)", 
           3
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -883,10 +849,6 @@
               5
             ]
           ]
-        ], 
-        "8": [
-          "INSTANCE", 
-          "C"
         ]
       }, 
       "line": 13, 
@@ -908,10 +870,6 @@
             "salutation": [
               "REF", 
               5
-            ], 
-            "__return__": [
-              "REF", 
-              6
             ]
           }, 
           "is_highlighted": false, 
@@ -921,8 +879,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -965,6 +922,10 @@
         ]
       }, 
       "heap": {
+        "8": [
+          "INSTANCE", 
+          "C"
+        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -992,20 +953,6 @@
           "salutation(self)", 
           3
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -1020,10 +967,6 @@
               5
             ]
           ]
-        ], 
-        "8": [
-          "INSTANCE", 
-          "C"
         ]
       }, 
       "line": 9, 
@@ -1045,10 +988,6 @@
             "salutation": [
               "REF", 
               5
-            ], 
-            "__return__": [
-              "REF", 
-              6
             ]
           }, 
           "is_highlighted": false, 
@@ -1058,8 +997,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -1102,6 +1040,10 @@
         ]
       }, 
       "heap": {
+        "8": [
+          "INSTANCE", 
+          "C"
+        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -1129,20 +1071,6 @@
           "salutation(self)", 
           3
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -1157,10 +1085,6 @@
               5
             ]
           ]
-        ], 
-        "8": [
-          "INSTANCE", 
-          "C"
         ]
       }, 
       "line": 10, 
@@ -1182,10 +1106,6 @@
             "salutation": [
               "REF", 
               5
-            ], 
-            "__return__": [
-              "REF", 
-              6
             ]
           }, 
           "is_highlighted": false, 
@@ -1195,8 +1115,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -1241,6 +1160,10 @@
         ]
       }, 
       "heap": {
+        "8": [
+          "INSTANCE", 
+          "C"
+        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -1268,20 +1191,6 @@
           "salutation(self)", 
           3
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -1296,10 +1205,6 @@
               5
             ]
           ]
-        ], 
-        "8": [
-          "INSTANCE", 
-          "C"
         ]
       }, 
       "line": 10, 
@@ -1321,10 +1226,6 @@
             "salutation": [
               "REF", 
               5
-            ], 
-            "__return__": [
-              "REF", 
-              6
             ]
           }, 
           "is_highlighted": false, 
@@ -1334,8 +1235,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }
       ], 
@@ -1358,6 +1258,10 @@
         ]
       }, 
       "heap": {
+        "8": [
+          "INSTANCE", 
+          "C"
+        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -1385,20 +1289,6 @@
           "salutation(self)", 
           3
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -1413,10 +1303,6 @@
               5
             ]
           ]
-        ], 
-        "8": [
-          "INSTANCE", 
-          "C"
         ]
       }, 
       "line": 14, 
@@ -1438,10 +1324,6 @@
             "salutation": [
               "REF", 
               5
-            ], 
-            "__return__": [
-              "REF", 
-              6
             ]
           }, 
           "is_highlighted": false, 
@@ -1451,8 +1333,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }
       ], 
@@ -1475,6 +1356,14 @@
         ]
       }, 
       "heap": {
+        "8": [
+          "INSTANCE", 
+          "C", 
+          [
+            "x", 
+            100
+          ]
+        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -1502,20 +1391,6 @@
           "salutation(self)", 
           3
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -1530,14 +1405,6 @@
               5
             ]
           ]
-        ], 
-        "8": [
-          "INSTANCE", 
-          "C", 
-          [
-            "x", 
-            100
-          ]
         ]
       }, 
       "line": 15, 
@@ -1559,10 +1426,6 @@
             "salutation": [
               "REF", 
               5
-            ], 
-            "__return__": [
-              "REF", 
-              6
             ]
           }, 
           "is_highlighted": false, 
@@ -1572,8 +1435,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -1616,6 +1478,14 @@
         ]
       }, 
       "heap": {
+        "8": [
+          "INSTANCE", 
+          "C", 
+          [
+            "x", 
+            100
+          ]
+        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -1643,20 +1513,6 @@
           "salutation(self)", 
           3
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -1671,14 +1527,6 @@
               5
             ]
           ]
-        ], 
-        "8": [
-          "INSTANCE", 
-          "C", 
-          [
-            "x", 
-            100
-          ]
         ]
       }, 
       "line": 9, 
@@ -1700,10 +1548,6 @@
             "salutation": [
               "REF", 
               5
-            ], 
-            "__return__": [
-              "REF", 
-              6
             ]
           }, 
           "is_highlighted": false, 
@@ -1713,8 +1557,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -1757,6 +1600,14 @@
         ]
       }, 
       "heap": {
+        "8": [
+          "INSTANCE", 
+          "C", 
+          [
+            "x", 
+            100
+          ]
+        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -1784,20 +1635,6 @@
           "salutation(self)", 
           3
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -1812,14 +1649,6 @@
               5
             ]
           ]
-        ], 
-        "8": [
-          "INSTANCE", 
-          "C", 
-          [
-            "x", 
-            100
-          ]
         ]
       }, 
       "line": 10, 
@@ -1841,10 +1670,6 @@
             "salutation": [
               "REF", 
               5
-            ], 
-            "__return__": [
-              "REF", 
-              6
             ]
           }, 
           "is_highlighted": false, 
@@ -1854,8 +1679,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }, 
         {
@@ -1900,6 +1724,14 @@
         ]
       }, 
       "heap": {
+        "8": [
+          "INSTANCE", 
+          "C", 
+          [
+            "x", 
+            100
+          ]
+        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -1927,20 +1759,6 @@
           "salutation(self)", 
           3
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -1955,14 +1773,6 @@
               5
             ]
           ]
-        ], 
-        "8": [
-          "INSTANCE", 
-          "C", 
-          [
-            "x", 
-            100
-          ]
         ]
       }, 
       "line": 10, 
@@ -1984,10 +1794,6 @@
             "salutation": [
               "REF", 
               5
-            ], 
-            "__return__": [
-              "REF", 
-              6
             ]
           }, 
           "is_highlighted": false, 
@@ -1997,8 +1803,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation", 
-            "__return__"
+            "salutation"
           ]
         }
       ], 
@@ -2021,6 +1826,14 @@
         ]
       }, 
       "heap": {
+        "8": [
+          "INSTANCE", 
+          "C", 
+          [
+            "x", 
+            100
+          ]
+        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -2048,20 +1861,6 @@
           "salutation(self)", 
           3
         ], 
-        "6": [
-          "DICT", 
-          [
-            "salutation", 
-            [
-              "REF", 
-              5
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -2076,14 +1875,6 @@
               5
             ]
           ]
-        ], 
-        "8": [
-          "INSTANCE", 
-          "C", 
-          [
-            "x", 
-            100
-          ]
         ]
       }, 
       "line": 15, 
diff --git a/v3/example-code/sqrt.golden b/v3/example-code/sqrt.golden
index f091f44c5..d062b58ee 100644
--- a/v3/example-code/sqrt.golden
+++ b/v3/example-code/sqrt.golden
@@ -8853,15 +8853,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "sqrt_iter": [
-              "REF", 
-              5
-            ], 
-            "is_good_enough": [
-              "REF", 
-              3
-            ], 
-            "__return__": 3.0001, 
             "x": 9, 
             "average": [
               "REF", 
@@ -8870,6 +8861,14 @@
             "improve": [
               "REF", 
               4
+            ], 
+            "sqrt_iter": [
+              "REF", 
+              5
+            ], 
+            "is_good_enough": [
+              "REF", 
+              3
             ]
           }, 
           "is_highlighted": false, 
@@ -8883,8 +8882,7 @@
             "average", 
             "improve", 
             "is_good_enough", 
-            "sqrt_iter", 
-            "__return__"
+            "sqrt_iter"
           ]
         }
       ], 
diff --git a/v3/example-code/sum.golden b/v3/example-code/sum.golden
index f216f1ac6..8ecbe11e5 100644
--- a/v3/example-code/sum.golden
+++ b/v3/example-code/sum.golden
@@ -10118,7 +10118,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "high": 10, 
-            "__return__": 385, 
             "low": 1
           }, 
           "is_highlighted": false, 
@@ -10129,8 +10128,7 @@
           "unique_hash": "sumsquares_f1_p_z", 
           "ordered_varnames": [
             "low", 
-            "high", 
-            "__return__"
+            "high"
           ]
         }
       ], 
diff --git a/v3/tests/backend-tests/class_test.golden b/v3/tests/backend-tests/class_test.golden
index 882d13ef9..d0770d384 100644
--- a/v3/tests/backend-tests/class_test.golden
+++ b/v3/tests/backend-tests/class_test.golden
@@ -189,10 +189,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -210,8 +206,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }
       ], 
@@ -227,27 +222,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -286,10 +260,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -307,8 +277,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }, 
         {
@@ -348,27 +317,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -411,10 +359,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -432,8 +376,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }, 
         {
@@ -473,27 +416,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -536,10 +458,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -557,8 +475,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }, 
         {
@@ -598,27 +515,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -665,10 +561,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -686,8 +578,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }, 
         {
@@ -729,27 +620,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -801,10 +671,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -822,8 +688,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }
       ], 
@@ -843,27 +708,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -915,10 +759,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -936,8 +776,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }, 
         {
@@ -977,27 +816,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -1049,10 +867,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -1070,8 +884,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }, 
         {
@@ -1111,27 +924,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -1183,10 +975,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -1204,8 +992,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }, 
         {
@@ -1247,27 +1034,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -1319,10 +1085,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -1340,8 +1102,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }
       ], 
@@ -1361,27 +1122,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -1433,10 +1173,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -1454,8 +1190,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }, 
         {
@@ -1499,27 +1234,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -1575,10 +1289,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -1596,8 +1306,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }, 
         {
@@ -1641,27 +1350,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -1717,10 +1405,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -1738,8 +1422,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }, 
         {
@@ -1783,27 +1466,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -1863,10 +1525,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -1884,8 +1542,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }, 
         {
@@ -1931,27 +1588,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -2016,10 +1652,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -2037,8 +1669,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }
       ], 
@@ -2062,27 +1693,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -2147,10 +1757,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -2168,8 +1774,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }, 
         {
@@ -2213,27 +1818,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -2298,10 +1882,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -2319,8 +1899,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }, 
         {
@@ -2364,27 +1943,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -2449,10 +2007,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -2470,8 +2024,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }, 
         {
@@ -2517,27 +2070,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -2602,10 +2134,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "__str__": [
               "REF", 
               3
@@ -2623,8 +2151,7 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__", 
-            "__return__"
+            "__str__"
           ]
         }
       ], 
@@ -2648,27 +2175,6 @@
           "__init__(self, x, y)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "__str__", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ], 
-          [
-            "__doc__", 
-            null
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
diff --git a/v3/tests/backend-tests/generator_use_test.golden b/v3/tests/backend-tests/generator_use_test.golden
index 2276f75de..3639984d7 100644
--- a/v3/tests/backend-tests/generator_use_test.golden
+++ b/v3/tests/backend-tests/generator_use_test.golden
@@ -284,7 +284,6 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": 1, 
             "x": 1
           }, 
           "is_highlighted": true, 
@@ -294,8 +293,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "gen_odds_f2", 
           "ordered_varnames": [
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -327,7 +325,6 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": 1, 
             "x": 1
           }, 
           "is_highlighted": true, 
@@ -337,8 +334,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "gen_odds_f2", 
           "ordered_varnames": [
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -370,7 +366,6 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": 1, 
             "x": 3
           }, 
           "is_highlighted": true, 
@@ -380,8 +375,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "gen_odds_f2", 
           "ordered_varnames": [
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -413,7 +407,6 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": 1, 
             "x": 3
           }, 
           "is_highlighted": true, 
@@ -423,8 +416,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "gen_odds_f2", 
           "ordered_varnames": [
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -549,7 +541,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 3
           }, 
           "is_highlighted": true, 
@@ -559,8 +550,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "gen_odds_f3", 
           "ordered_varnames": [
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -592,7 +582,6 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 3, 
             "x": 3
           }, 
           "is_highlighted": true, 
@@ -602,8 +591,7 @@
           "parent_frame_id_list": [], 
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@@ -645,8 +632,7 @@
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@@ -688,8 +673,7 @@
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@@ -824,8 +807,7 @@
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@@ -867,8 +848,7 @@
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@@ -910,8 +889,7 @@
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@@ -953,8 +930,7 @@
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@@ -1089,8 +1064,7 @@
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@@ -1132,8 +1105,7 @@
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@@ -1175,8 +1146,7 @@
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@@ -1218,8 +1187,7 @@
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@@ -1354,8 +1321,7 @@
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@@ -1397,8 +1362,7 @@
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@@ -1440,8 +1403,7 @@
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@@ -1483,8 +1444,7 @@
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@@ -1619,8 +1578,7 @@
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@@ -1662,8 +1619,7 @@
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@@ -1748,8 +1701,7 @@
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@@ -1884,8 +1835,7 @@
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@@ -1927,8 +1876,7 @@
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@@ -1970,8 +1917,7 @@
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@@ -2013,8 +1958,7 @@
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@@ -2149,8 +2092,7 @@
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@@ -2192,8 +2133,7 @@
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@@ -2235,8 +2174,7 @@
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@@ -2414,8 +2349,7 @@
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@@ -2457,8 +2390,7 @@
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@@ -2500,8 +2431,7 @@
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@@ -2533,7 +2463,6 @@
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@@ -2543,8 +2472,7 @@
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@@ -2679,8 +2606,7 @@
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@@ -2722,8 +2647,7 @@
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@@ -2765,8 +2688,7 @@
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@@ -2808,8 +2729,7 @@
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@@ -2944,8 +2863,7 @@
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+            "x"
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@@ -2977,7 +2895,6 @@
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@@ -2987,8 +2904,7 @@
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@@ -3030,8 +2945,7 @@
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@@ -3063,7 +2977,6 @@
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@@ -3073,8 +2986,7 @@
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@@ -3209,8 +3120,7 @@
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@@ -3252,8 +3161,7 @@
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@@ -3295,8 +3202,7 @@
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@@ -3338,8 +3243,7 @@
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@@ -3474,8 +3377,7 @@
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@@ -3507,7 +3409,6 @@
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@@ -3517,8 +3418,7 @@
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@@ -3550,7 +3450,6 @@
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@@ -3560,8 +3459,7 @@
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@@ -3593,7 +3491,6 @@
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@@ -3603,8 +3500,7 @@
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@@ -3739,8 +3634,7 @@
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@@ -3772,7 +3666,6 @@
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@@ -3782,8 +3675,7 @@
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@@ -3825,8 +3716,7 @@
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@@ -3868,8 +3757,7 @@
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@@ -4004,8 +3891,7 @@
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-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -10884,7 +10564,6 @@
         {
           "frame_id": 42, 
           "encoded_locals": {
-            "__return__": 81, 
             "x": 81
           }, 
           "is_highlighted": true, 
@@ -10894,8 +10573,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "gen_odds_f42", 
           "ordered_varnames": [
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -10927,7 +10605,6 @@
         {
           "frame_id": 42, 
           "encoded_locals": {
-            "__return__": 81, 
             "x": 81
           }, 
           "is_highlighted": true, 
@@ -10937,8 +10614,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "gen_odds_f42", 
           "ordered_varnames": [
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -10970,7 +10646,6 @@
         {
           "frame_id": 42, 
           "encoded_locals": {
-            "__return__": 81, 
             "x": 83
           }, 
           "is_highlighted": true, 
@@ -10980,8 +10655,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "gen_odds_f42", 
           "ordered_varnames": [
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -11013,7 +10687,6 @@
         {
           "frame_id": 42, 
           "encoded_locals": {
-            "__return__": 81, 
             "x": 83
           }, 
           "is_highlighted": true, 
@@ -11023,8 +10696,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "gen_odds_f42", 
           "ordered_varnames": [
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -11149,7 +10821,6 @@
         {
           "frame_id": 43, 
           "encoded_locals": {
-            "__return__": 83, 
             "x": 83
           }, 
           "is_highlighted": true, 
@@ -11159,8 +10830,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "gen_odds_f43", 
           "ordered_varnames": [
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -11192,7 +10862,6 @@
         {
           "frame_id": 43, 
           "encoded_locals": {
-            "__return__": 83, 
             "x": 83
           }, 
           "is_highlighted": true, 
@@ -11202,8 +10871,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "gen_odds_f43", 
           "ordered_varnames": [
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -11235,7 +10903,6 @@
         {
           "frame_id": 43, 
           "encoded_locals": {
-            "__return__": 83, 
             "x": 85
           }, 
           "is_highlighted": true, 
@@ -11245,8 +10912,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "gen_odds_f43", 
           "ordered_varnames": [
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -11278,7 +10944,6 @@
         {
           "frame_id": 43, 
           "encoded_locals": {
-            "__return__": 83, 
             "x": 85
           }, 
           "is_highlighted": true, 
@@ -11288,8 +10953,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "gen_odds_f43", 
           "ordered_varnames": [
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
diff --git a/v3/tests/backend-tests/john-compose.golden b/v3/tests/backend-tests/john-compose.golden
index 9acb62b04..1272f090b 100644
--- a/v3/tests/backend-tests/john-compose.golden
+++ b/v3/tests/backend-tests/john-compose.golden
@@ -226,10 +226,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "g": [
               "REF", 
               2
@@ -247,8 +243,7 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }
       ], 
@@ -298,10 +293,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "g": [
               "REF", 
               2
@@ -319,8 +310,7 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -387,10 +377,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "g": [
               "REF", 
               2
@@ -408,8 +394,7 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -476,10 +461,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "g": [
               "REF", 
               2
@@ -497,8 +478,7 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -580,10 +560,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "g": [
               "REF", 
               2
@@ -601,8 +577,7 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -684,10 +659,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "g": [
               "REF", 
               2
@@ -705,8 +676,7 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -790,10 +760,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "g": [
               "REF", 
               2
@@ -811,8 +777,7 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -894,10 +859,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "g": [
               "REF", 
               2
@@ -915,8 +876,7 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -998,10 +958,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "g": [
               "REF", 
               2
@@ -1019,8 +975,7 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -1104,10 +1059,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "g": [
               "REF", 
               2
@@ -1125,8 +1076,7 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }, 
         {
@@ -1196,10 +1146,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              4
-            ], 
             "g": [
               "REF", 
               2
@@ -1217,8 +1163,7 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g", 
-            "__return__"
+            "g"
           ]
         }
       ], 
diff --git a/v3/tests/backend-tests/lambda_1.golden b/v3/tests/backend-tests/lambda_1.golden
index 329be1475..dbc526b25 100644
--- a/v3/tests/backend-tests/lambda_1.golden
+++ b/v3/tests/backend-tests/lambda_1.golden
@@ -5448,7 +5448,6 @@
           "frame_id": 1, 
           "encoded_locals": {
             "high": 5, 
-            "__return__": 55, 
             "low": 1
           }, 
           "is_highlighted": false, 
@@ -5459,8 +5458,7 @@
           "unique_hash": "sumsquares_f1_p_z", 
           "ordered_varnames": [
             "low", 
-            "high", 
-            "__return__"
+            "high"
           ]
         }
       ], 
diff --git a/v3/tests/backend-tests/ling-scheme-2.golden b/v3/tests/backend-tests/ling-scheme-2.golden
index add7f461f..c5c7075fa 100644
--- a/v3/tests/backend-tests/ling-scheme-2.golden
+++ b/v3/tests/backend-tests/ling-scheme-2.golden
@@ -3728,10 +3728,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              9
-            ], 
             "loop": [
               "REF", 
               2
@@ -3746,8 +3742,7 @@
           "unique_hash": "iota_f1_p_z", 
           "ordered_varnames": [
             "n", 
-            "loop", 
-            "__return__"
+            "loop"
           ]
         }
       ], 
diff --git a/v3/tests/backend-tests/ling-scheme-3.golden b/v3/tests/backend-tests/ling-scheme-3.golden
index be3b46e8e..2222c5742 100644
--- a/v3/tests/backend-tests/ling-scheme-3.golden
+++ b/v3/tests/backend-tests/ling-scheme-3.golden
@@ -8513,10 +8513,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              28
-            ], 
             "xs": [
               "REF", 
               4
@@ -8529,8 +8525,7 @@
           "parent_frame_id_list": [], 
           "unique_hash": "pairs_f1_p_z", 
           "ordered_varnames": [
-            "xs", 
-            "__return__"
+            "xs"
           ]
         }
       ], 
diff --git a/v3/tests/backend-tests/newstyle_class.golden b/v3/tests/backend-tests/newstyle_class.golden
index f428115c5..3718cc971 100644
--- a/v3/tests/backend-tests/newstyle_class.golden
+++ b/v3/tests/backend-tests/newstyle_class.golden
@@ -223,10 +223,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": [
               "REF", 
               3
@@ -246,8 +242,7 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -263,27 +258,6 @@
           "__init__(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "x", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "bla", 
-            "A"
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -326,10 +300,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": [
               "REF", 
               3
@@ -349,8 +319,7 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }, 
         {
@@ -386,27 +355,6 @@
           "__init__(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "x", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "bla", 
-            "A"
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -453,10 +401,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": [
               "REF", 
               3
@@ -476,8 +420,7 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }, 
         {
@@ -513,27 +456,6 @@
           "__init__(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "x", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "bla", 
-            "A"
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -580,10 +502,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": [
               "REF", 
               3
@@ -603,8 +521,7 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }, 
         {
@@ -642,27 +559,6 @@
           "__init__(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "x", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "bla", 
-            "A"
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -714,10 +610,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": [
               "REF", 
               3
@@ -737,8 +629,7 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -758,27 +649,6 @@
           "__init__(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "x", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "bla", 
-            "A"
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -830,10 +700,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": [
               "REF", 
               3
@@ -853,8 +719,7 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }, 
         {
@@ -894,27 +759,6 @@
           "__init__(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "x", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "bla", 
-            "A"
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -966,10 +810,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": [
               "REF", 
               3
@@ -989,8 +829,7 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }, 
         {
@@ -1030,27 +869,6 @@
           "__init__(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "x", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "bla", 
-            "A"
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -1102,10 +920,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": [
               "REF", 
               3
@@ -1125,8 +939,7 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }, 
         {
@@ -1168,27 +981,6 @@
           "__init__(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "x", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "bla", 
-            "A"
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -1244,10 +1036,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": [
               "REF", 
               3
@@ -1267,8 +1055,7 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1288,27 +1075,6 @@
           "__init__(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "x", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "bla", 
-            "A"
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -1364,10 +1130,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": [
               "REF", 
               3
@@ -1387,8 +1149,7 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1408,27 +1169,6 @@
           "__init__(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "x", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "bla", 
-            "A"
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -1484,10 +1224,6 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
-            "__return__": [
-              "REF", 
-              2
-            ], 
             "x": [
               "REF", 
               3
@@ -1507,8 +1243,7 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x", 
-            "__return__"
+            "x"
           ]
         }
       ], 
@@ -1528,27 +1263,6 @@
           "__init__(self)", 
           1
         ], 
-        "2": [
-          "DICT", 
-          [
-            "x", 
-            [
-              "REF", 
-              3
-            ]
-          ], 
-          [
-            "bla", 
-            "A"
-          ], 
-          [
-            "__init__", 
-            [
-              "REF", 
-              1
-            ]
-          ]
-        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 

From 5a0926ba0990809eb2876eab27675f63dccd4624 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 18:00:58 -0700
Subject: [PATCH 219/502] tiny

---
 v3/js/pytutor.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 3b0e60386..08a55005c 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -1996,7 +1996,7 @@ ExecutionVisualizer.prototype.redrawConnectors = function() {
 var highlightedLineColor = '#e4faeb';
 var highlightedLineBorderColor = '#005583';
 
-var highlightedLineLighterColor = '#edfff2';
+var highlightedLineLighterColor = '#effff3';
 
 var visitedLineColor = highlightedLineBorderColor;
 

From 8443a07084420cd6befd3591cfe9e003bdd5a968 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 23:06:03 -0700
Subject: [PATCH 220/502] updated code examples to work on both Python 2 and 3

---
 v3/example-code/aliasing.golden              |  2 +-
 v3/example-code/aliasing.txt                 |  2 +-
 v3/example-code/closures/lambda-param.golden |  2 +-
 v3/example-code/closures/lambda-param.txt    |  2 +-
 v3/example-code/fact.golden                  |  2 +-
 v3/example-code/fact.txt                     |  2 +-
 v3/example-code/fib.golden                   |  2 +-
 v3/example-code/fib.txt                      |  4 ++--
 v3/example-code/filter.golden                |  2 +-
 v3/example-code/filter.txt                   |  4 ++--
 v3/example-code/gen_primes.golden            |  2 +-
 v3/example-code/gen_primes.txt               |  2 +-
 v3/example-code/ins_sort.golden              |  2 +-
 v3/example-code/ins_sort.txt                 |  2 +-
 v3/example-code/oop_1.golden                 |  2 +-
 v3/example-code/oop_1.txt                    | 10 +++++-----
 v3/example-code/oop_2.golden                 |  2 +-
 v3/example-code/oop_2.txt                    |  2 +-
 v3/example-code/oop_small.golden             |  2 +-
 v3/example-code/oop_small.txt                |  4 ++--
 v3/example-code/py_tutorial.golden           |  2 +-
 v3/example-code/py_tutorial.txt              | 16 ++++++++--------
 v3/example-code/strtok.golden                |  2 +-
 v3/example-code/strtok.txt                   |  2 +-
 v3/example-code/sum.golden                   |  2 +-
 v3/example-code/sum.txt                      |  2 +-
 v3/example-code/wentworth_gcd.golden         |  2 +-
 v3/example-code/wentworth_gcd.txt            | 10 +++++-----
 v3/example-code/wentworth_sumList.golden     |  2 +-
 v3/example-code/wentworth_sumList.txt        |  8 ++++----
 v3/example-code/wentworth_try_finally.golden |  2 +-
 v3/example-code/wentworth_try_finally.txt    |  6 +++---
 32 files changed, 55 insertions(+), 55 deletions(-)

diff --git a/v3/example-code/aliasing.golden b/v3/example-code/aliasing.golden
index f674bbff3..d0f3f9997 100644
--- a/v3/example-code/aliasing.golden
+++ b/v3/example-code/aliasing.golden
@@ -1,5 +1,5 @@
 {
-  "code": "x = [1, 2, 3]\ny = [4, 5, 6]\nz = y\ny = x\nx = z\n\nx = [1, 2, 3] # a different [1, 2, 3] list!\ny = x\nx.append(4)\ny.append(5)\nz = [1, 2, 3, 4, 5] # a different list!\nx.append(6)\ny.append(7)\ny = \"hello\"\n\n\ndef foo(lst):\n    lst.append(\"hello\")\n    bar(lst)\n\ndef bar(myLst):\n    print myLst\n\nfoo(x)\nfoo(z)\n", 
+  "code": "x = [1, 2, 3]\ny = [4, 5, 6]\nz = y\ny = x\nx = z\n\nx = [1, 2, 3] # a different [1, 2, 3] list!\ny = x\nx.append(4)\ny.append(5)\nz = [1, 2, 3, 4, 5] # a different list!\nx.append(6)\ny.append(7)\ny = \"hello\"\n\n\ndef foo(lst):\n    lst.append(\"hello\")\n    bar(lst)\n\ndef bar(myLst):\n    print(myLst)\n\nfoo(x)\nfoo(z)\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/aliasing.txt b/v3/example-code/aliasing.txt
index eb326fc5d..459b370db 100644
--- a/v3/example-code/aliasing.txt
+++ b/v3/example-code/aliasing.txt
@@ -19,7 +19,7 @@ def foo(lst):
     bar(lst)
 
 def bar(myLst):
-    print myLst
+    print(myLst)
 
 foo(x)
 foo(z)
diff --git a/v3/example-code/closures/lambda-param.golden b/v3/example-code/closures/lambda-param.golden
index f15175aba..3bf4753ae 100644
--- a/v3/example-code/closures/lambda-param.golden
+++ b/v3/example-code/closures/lambda-param.golden
@@ -1,5 +1,5 @@
 {
-  "code": "def foo(x):\n  bar(lambda y: x + y)\n\ndef bar(a):\n  print a(20)\n\nfoo(10)\n", 
+  "code": "def foo(x):\n  bar(lambda y: x + y)\n\ndef bar(a):\n  print(a(20))\n\nfoo(10)\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/closures/lambda-param.txt b/v3/example-code/closures/lambda-param.txt
index 5bf9dcecb..4944f2c20 100644
--- a/v3/example-code/closures/lambda-param.txt
+++ b/v3/example-code/closures/lambda-param.txt
@@ -2,6 +2,6 @@ def foo(x):
   bar(lambda y: x + y)
 
 def bar(a):
-  print a(20)
+  print(a(20))
 
 foo(10)
diff --git a/v3/example-code/fact.golden b/v3/example-code/fact.golden
index 1df6def65..6f756d707 100644
--- a/v3/example-code/fact.golden
+++ b/v3/example-code/fact.golden
@@ -1,5 +1,5 @@
 {
-  "code": "# dumb recursive factorial\ndef fact(n):\n    if (n <= 1):\n        return 1\n    else:\n        return n * fact(n - 1)\n\nprint fact(6)\n", 
+  "code": "# dumb recursive factorial\ndef fact(n):\n    if (n <= 1):\n        return 1\n    else:\n        return n * fact(n - 1)\n\nprint(fact(6))\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/fact.txt b/v3/example-code/fact.txt
index d956324b0..a6b6f446f 100644
--- a/v3/example-code/fact.txt
+++ b/v3/example-code/fact.txt
@@ -5,4 +5,4 @@ def fact(n):
     else:
         return n * fact(n - 1)
 
-print fact(6)
+print(fact(6))
diff --git a/v3/example-code/fib.golden b/v3/example-code/fib.golden
index 5533695de..7afe29d04 100644
--- a/v3/example-code/fib.golden
+++ b/v3/example-code/fib.golden
@@ -1,5 +1,5 @@
 {
-  "code": "# Infinite Fibonacci!!!\n\narr = [1, 1]\n\nprint arr[0]\n\nwhile True:\n    print arr[-1]\n    tmp = sum(arr)\n    arr.append(tmp)\n    del arr[0]\n", 
+  "code": "# Infinite Fibonacci!!!\n\narr = [1, 1]\n\nprint(arr[0])\n\nwhile True:\n    print(arr[-1])\n    tmp = sum(arr)\n    arr.append(tmp)\n    del arr[0]\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/fib.txt b/v3/example-code/fib.txt
index 96c8799c2..d5447f19b 100644
--- a/v3/example-code/fib.txt
+++ b/v3/example-code/fib.txt
@@ -2,10 +2,10 @@
 
 arr = [1, 1]
 
-print arr[0]
+print(arr[0])
 
 while True:
-    print arr[-1]
+    print(arr[-1])
     tmp = sum(arr)
     arr.append(tmp)
     del arr[0]
diff --git a/v3/example-code/filter.golden b/v3/example-code/filter.golden
index e189a782e..1e1111344 100644
--- a/v3/example-code/filter.golden
+++ b/v3/example-code/filter.golden
@@ -1,5 +1,5 @@
 {
-  "code": "input = [(\"Mary\", 27), (\"Joe\", 30), (\"Ruth\", 43), (\"Bob\", 17), (\"Jenny\", 22)]\n\nyoungPeople = []\n\nfor (person, age) in input:\n    if age < 30:\n        youngPeople.append(person)\n    else:\n        print \"HAHA\", person, \"is too old!\"\n\nprint \"There are\", len(youngPeople), \"young people\"\n", 
+  "code": "input = [(\"Mary\", 27), (\"Joe\", 30), (\"Ruth\", 43), (\"Bob\", 17), (\"Jenny\", 22)]\n\nyoungPeople = []\n\nfor (person, age) in input:\n    if age < 30:\n        youngPeople.append(person)\n    else:\n        print(\"HAHA \" + person + \" is too old!\")\n\nprint(\"There are \" + str(len(youngPeople)) + \" young people\")\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/filter.txt b/v3/example-code/filter.txt
index f3b3916fb..e09de854c 100644
--- a/v3/example-code/filter.txt
+++ b/v3/example-code/filter.txt
@@ -6,6 +6,6 @@ for (person, age) in input:
     if age < 30:
         youngPeople.append(person)
     else:
-        print "HAHA", person, "is too old!"
+        print("HAHA " + person + " is too old!")
 
-print "There are", len(youngPeople), "young people"
+print("There are " + str(len(youngPeople)) + " young people")
diff --git a/v3/example-code/gen_primes.golden b/v3/example-code/gen_primes.golden
index d0cdadeb0..480ece9bb 100644
--- a/v3/example-code/gen_primes.golden
+++ b/v3/example-code/gen_primes.golden
@@ -1,5 +1,5 @@
 {
-  "code": "# Use generator to generate a stream of primes\ndef gen_primes():\n    n = 2\n    while True:\n        for x in range(2, n):\n            if n % x == 0:\n                break\n        else:\n            yield n\n        n += 1\n\nfor p in gen_primes():\n    print p\n\n", 
+  "code": "# Use generator to generate a stream of primes\ndef gen_primes():\n    n = 2\n    while True:\n        for x in range(2, n):\n            if n % x == 0:\n                break\n        else:\n            yield n\n        n += 1\n\nfor p in gen_primes():\n    print(p)\n\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/gen_primes.txt b/v3/example-code/gen_primes.txt
index a41dc831f..2b047187b 100644
--- a/v3/example-code/gen_primes.txt
+++ b/v3/example-code/gen_primes.txt
@@ -10,5 +10,5 @@ def gen_primes():
         n += 1
 
 for p in gen_primes():
-    print p
+    print(p)
 
diff --git a/v3/example-code/ins_sort.golden b/v3/example-code/ins_sort.golden
index a7f4751dd..837933f43 100644
--- a/v3/example-code/ins_sort.golden
+++ b/v3/example-code/ins_sort.golden
@@ -1,5 +1,5 @@
 {
-  "code": "# from: http://www.ece.uci.edu/~chou/py02/python.html\ndef InsertionSort(A):\n    for j in range(1, len(A)):\n        key = A[j]\n        i = j - 1\n        while (i >= 0) and (A[i] > key):\n            A[i+1] = A[i]\n            i = i - 1\n        A[i+1] = key\n\ninput = [8, 3, 9, 15, 29, 7, 10]\nInsertionSort(input)\nprint input\n", 
+  "code": "# from: http://www.ece.uci.edu/~chou/py02/python.html\ndef InsertionSort(A):\n    for j in range(1, len(A)):\n        key = A[j]\n        i = j - 1\n        while (i >= 0) and (A[i] > key):\n            A[i+1] = A[i]\n            i = i - 1\n        A[i+1] = key\n\ninput = [8, 3, 9, 15, 29, 7, 10]\nInsertionSort(input)\nprint(input)\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/ins_sort.txt b/v3/example-code/ins_sort.txt
index d6598fae2..4c2dacc0f 100644
--- a/v3/example-code/ins_sort.txt
+++ b/v3/example-code/ins_sort.txt
@@ -10,4 +10,4 @@ def InsertionSort(A):
 
 input = [8, 3, 9, 15, 29, 7, 10]
 InsertionSort(input)
-print input
+print(input)
diff --git a/v3/example-code/oop_1.golden b/v3/example-code/oop_1.golden
index 6afd13b48..68e914e00 100644
--- a/v3/example-code/oop_1.golden
+++ b/v3/example-code/oop_1.golden
@@ -1,5 +1,5 @@
 {
-  "code": "# Object-oriented programming intro\n# Adapted from MIT 6.01 course notes (Section 3.5)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\nclass Staff601:\n    course = '6.01'\n    building = 34\n    room = 501\n\n    def salutation(self):\n        return self.role + ' ' + self.name\n\npat = Staff601()\nprint pat.course\n\npat.name = 'Pat'\npat.age = 60\npat.role = 'Professor'\n\nprint pat.building\npat.building = 32\nprint pat.building\n\nprint pat.salutation()\nprint Staff601.salutation(pat)\n", 
+  "code": "# Object-oriented programming intro\n# Adapted from MIT 6.01 course notes (Section 3.5)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\nclass Staff601:\n    course = '6.01'\n    building = 34\n    room = 501\n\n    def salutation(self):\n        return self.role + ' ' + self.name\n\npat = Staff601()\nprint(pat.course)\n\npat.name = 'Pat'\npat.age = 60\npat.role = 'Professor'\n\nprint(pat.building)\npat.building = 32\nprint(pat.building)\n\nprint(pat.salutation())\nprint(Staff601.salutation(pat))\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/oop_1.txt b/v3/example-code/oop_1.txt
index f072f69f2..d04790552 100644
--- a/v3/example-code/oop_1.txt
+++ b/v3/example-code/oop_1.txt
@@ -11,15 +11,15 @@ class Staff601:
         return self.role + ' ' + self.name
 
 pat = Staff601()
-print pat.course
+print(pat.course)
 
 pat.name = 'Pat'
 pat.age = 60
 pat.role = 'Professor'
 
-print pat.building
+print(pat.building)
 pat.building = 32
-print pat.building
+print(pat.building)
 
-print pat.salutation()
-print Staff601.salutation(pat)
+print(pat.salutation())
+print(Staff601.salutation(pat))
diff --git a/v3/example-code/oop_2.golden b/v3/example-code/oop_2.golden
index 825326127..ea8435ae1 100644
--- a/v3/example-code/oop_2.golden
+++ b/v3/example-code/oop_2.golden
@@ -1,5 +1,5 @@
 {
-  "code": "# The __init__ 'constructor' - object-oriented programming intro\n# Adapted from MIT 6.01 course notes (Section 3.5)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\nclass Staff601:\n    course = '6.01'\n    building = 34\n    room = 501\n\n    def __init__(self, name, role, years, salary):\n      self.name = name\n      self.role = role\n      self.age = years\n      self.salary = salary\n\n    def salutation(self):\n        return self.role + ' ' + self.name\n\npat = Staff601('Pat', 'Professor', 60, 100000)\nprint pat.salutation()\n\n", 
+  "code": "# The __init__ 'constructor' - object-oriented programming intro\n# Adapted from MIT 6.01 course notes (Section 3.5)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\nclass Staff601:\n    course = '6.01'\n    building = 34\n    room = 501\n\n    def __init__(self, name, role, years, salary):\n      self.name = name\n      self.role = role\n      self.age = years\n      self.salary = salary\n\n    def salutation(self):\n        return self.role + ' ' + self.name\n\npat = Staff601('Pat', 'Professor', 60, 100000)\nprint(pat.salutation())\n\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/oop_2.txt b/v3/example-code/oop_2.txt
index c4f0a534d..014c82790 100644
--- a/v3/example-code/oop_2.txt
+++ b/v3/example-code/oop_2.txt
@@ -17,5 +17,5 @@ class Staff601:
         return self.role + ' ' + self.name
 
 pat = Staff601('Pat', 'Professor', 60, 100000)
-print pat.salutation()
+print(pat.salutation())
 
diff --git a/v3/example-code/oop_small.golden b/v3/example-code/oop_small.golden
index 7187af575..aa6ea12ec 100644
--- a/v3/example-code/oop_small.golden
+++ b/v3/example-code/oop_small.golden
@@ -1,5 +1,5 @@
 {
-  "code": "class A:\n    x = 1\n    y = 'hello'\n\nclass B:\n    z = 'bye'\n\nclass C(A,B):\n    def salutation(self):\n        return '%d %s %s' % (self.x, self.y, self.z)\n\ninst = C()\nprint inst.salutation()\ninst.x = 100\nprint inst.salutation()\n", 
+  "code": "class A:\n    x = 1\n    y = 'hello'\n\nclass B:\n    z = 'bye'\n\nclass C(A,B):\n    def salutation(self):\n        return '%d %s %s' % (self.x, self.y, self.z)\n\ninst = C()\nprint(inst.salutation())\ninst.x = 100\nprint(inst.salutation())\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/oop_small.txt b/v3/example-code/oop_small.txt
index e40400587..8a7ca559b 100644
--- a/v3/example-code/oop_small.txt
+++ b/v3/example-code/oop_small.txt
@@ -10,6 +10,6 @@ class C(A,B):
         return '%d %s %s' % (self.x, self.y, self.z)
 
 inst = C()
-print inst.salutation()
+print(inst.salutation())
 inst.x = 100
-print inst.salutation()
+print(inst.salutation())
diff --git a/v3/example-code/py_tutorial.golden b/v3/example-code/py_tutorial.golden
index 408ae9b30..8786b892b 100644
--- a/v3/example-code/py_tutorial.golden
+++ b/v3/example-code/py_tutorial.golden
@@ -1,5 +1,5 @@
 {
-  "code": "# Philip's 10-minute intro to Python\n\n# numbers!\nage = 26\npi = 3.14159\n\n# strings!\ns = 'Rutherford Birchard Hayes'\ntokens = s.split()\nfirstName = tokens[0]\nmiddleName = tokens[1]\nlastName = tokens[2]\ns2 = firstName + ' ' + middleName + ' ' + lastName\n\n# 'if' statement - indentation matters!\nif (s == s2):\n    print 'yes!!!'\nelse:\n    print 'nooooooo'\n\n# list (mutable sequence)\nbeatles = ['John', 'Paul', 'George']\nbeatles.append('Ringo')\n\n# 'for' loop - indentation matters!\nfor b in beatles:\n    print 'Hello', b\n\n# tuple (immutable sequence)\nages = (18, 21, 28, 21, 22, 18, 19, 34, 9)\n\n# set (no order, no duplicates)\nuniqueAges = set(ages)\nuniqueAges.add(18) # already in set, no effect\nuniqueAges.remove(21)\n\n# no guaranteed order when iterating over a set\nfor thisAge in uniqueAges:\n    print thisAge\n\n# testing set membership\nif 18 in uniqueAges:\n    print 'There is an 18-year-old present!'\n\n# sorting\nbeatles.sort() # in-place\norderedUniqueAges = sorted(uniqueAges) # new list\n\n# dict - mapping unique keys to values\nnetWorth = {}\nnetWorth['Donald Trump'] = 3000000000\nnetWorth['Bill Gates'] = 58000000000\nnetWorth['Tom Cruise'] = 40000000\nnetWorth['Joe Postdoc'] = 20000\n\n# iterating over key-value pairs:\nfor (person, worth) in netWorth.iteritems():\n    if worth < 1000000:\n        print 'haha', person, 'is not a millionaire'\n\n# testing dict membership\nif 'Tom Cruise' in netWorth:\n    print 'show me the money!'\n", 
+  "code": "# Philip's 10-minute intro to Python\n\n# numbers!\nage = 26\npi = 3.14159\n\n# strings!\ns = 'Rutherford Birchard Hayes'\ntokens = s.split()\nfirstName = tokens[0]\nmiddleName = tokens[1]\nlastName = tokens[2]\ns2 = firstName + ' ' + middleName + ' ' + lastName\n\n# 'if' statement - indentation matters!\nif (s == s2):\n    print('yes!!!')\nelse:\n    print('nooooooo')\n\n# list (mutable sequence)\nbeatles = ['John', 'Paul', 'George']\nbeatles.append('Ringo')\n\n# 'for' loop - indentation matters!\nfor b in beatles:\n    print('Hello ' + b)\n\n# tuple (immutable sequence)\nages = (18, 21, 28, 21, 22, 18, 19, 34, 9)\n\n# set (no order, no duplicates)\nuniqueAges = set(ages)\nuniqueAges.add(18) # already in set, no effect\nuniqueAges.remove(21)\n\n# no guaranteed order when iterating over a set\nfor thisAge in uniqueAges:\n    print(thisAge)\n\n# testing set membership\nif 18 in uniqueAges:\n    print('There is an 18-year-old present!')\n\n# sorting\nbeatles.sort() # in-place\norderedUniqueAges = sorted(uniqueAges) # new list\n\n# dict - mapping unique keys to values\nnetWorth = {}\nnetWorth['Donald Trump'] = 3000000000\nnetWorth['Bill Gates'] = 58000000000\nnetWorth['Tom Cruise'] = 40000000\nnetWorth['Joe Postdoc'] = 20000\n\n# iterating over key-value pairs:\nfor (person, worth) in netWorth.items():\n    if worth < 1000000:\n        print('haha ' + person + ' is not a millionaire')\n\n# testing dict membership\nif 'Tom Cruise' in netWorth:\n    print('show me the money!')\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/py_tutorial.txt b/v3/example-code/py_tutorial.txt
index 5f1a230d1..e51ab9599 100644
--- a/v3/example-code/py_tutorial.txt
+++ b/v3/example-code/py_tutorial.txt
@@ -14,9 +14,9 @@ s2 = firstName + ' ' + middleName + ' ' + lastName
 
 # 'if' statement - indentation matters!
 if (s == s2):
-    print 'yes!!!'
+    print('yes!!!')
 else:
-    print 'nooooooo'
+    print('nooooooo')
 
 # list (mutable sequence)
 beatles = ['John', 'Paul', 'George']
@@ -24,7 +24,7 @@ beatles.append('Ringo')
 
 # 'for' loop - indentation matters!
 for b in beatles:
-    print 'Hello', b
+    print('Hello ' + b)
 
 # tuple (immutable sequence)
 ages = (18, 21, 28, 21, 22, 18, 19, 34, 9)
@@ -36,11 +36,11 @@ uniqueAges.remove(21)
 
 # no guaranteed order when iterating over a set
 for thisAge in uniqueAges:
-    print thisAge
+    print(thisAge)
 
 # testing set membership
 if 18 in uniqueAges:
-    print 'There is an 18-year-old present!'
+    print('There is an 18-year-old present!')
 
 # sorting
 beatles.sort() # in-place
@@ -54,10 +54,10 @@ netWorth['Tom Cruise'] = 40000000
 netWorth['Joe Postdoc'] = 20000
 
 # iterating over key-value pairs:
-for (person, worth) in netWorth.iteritems():
+for (person, worth) in netWorth.items():
     if worth < 1000000:
-        print 'haha', person, 'is not a millionaire'
+        print('haha ' + person + ' is not a millionaire')
 
 # testing dict membership
 if 'Tom Cruise' in netWorth:
-    print 'show me the money!'
+    print('show me the money!')
diff --git a/v3/example-code/strtok.golden b/v3/example-code/strtok.golden
index 2bd3a031a..3c5031e8f 100644
--- a/v3/example-code/strtok.golden
+++ b/v3/example-code/strtok.golden
@@ -1,5 +1,5 @@
 {
-  "code": "input = 'John,Doe,1984,4,1,male'\n\ntokens = input.split(',')\nfirstName = tokens[0]\nlastName = tokens[1]\nbirthdate = (int(tokens[2]), int(tokens[3]), int(tokens[4]))\nisMale = (tokens[5] == 'male')\n\nprint 'Hi', firstName, lastName\n", 
+  "code": "input = 'John,Doe,1984,4,1,male'\n\ntokens = input.split(',')\nfirstName = tokens[0]\nlastName = tokens[1]\nbirthdate = (int(tokens[2]), int(tokens[3]), int(tokens[4]))\nisMale = (tokens[5] == 'male')\n\nprint('Hi ' + firstName + ' ' + lastName)\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/strtok.txt b/v3/example-code/strtok.txt
index 96e8100d5..52e08f112 100644
--- a/v3/example-code/strtok.txt
+++ b/v3/example-code/strtok.txt
@@ -6,4 +6,4 @@ lastName = tokens[1]
 birthdate = (int(tokens[2]), int(tokens[3]), int(tokens[4]))
 isMale = (tokens[5] == 'male')
 
-print 'Hi', firstName, lastName
+print('Hi ' + firstName + ' ' + lastName)
diff --git a/v3/example-code/sum.golden b/v3/example-code/sum.golden
index 8ecbe11e5..d70d98a11 100644
--- a/v3/example-code/sum.golden
+++ b/v3/example-code/sum.golden
@@ -1,5 +1,5 @@
 {
-  "code": "# Higher-order functions\n# Adapted from MIT 6.01 course notes (Section A.2.2)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\ndef summation(low, high, f, next):\n    s = 0\n    x = low\n    while x <= high:\n        s = s + f(x)\n        x = next(x)\n    return s\n\ndef sumsquares(low, high):\n    return summation(low, high, lambda x: x**2, lambda x: x+1)\n\nprint sumsquares(1, 10)\n", 
+  "code": "# Higher-order functions\n# Adapted from MIT 6.01 course notes (Section A.2.2)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\ndef summation(low, high, f, next):\n    s = 0\n    x = low\n    while x <= high:\n        s = s + f(x)\n        x = next(x)\n    return s\n\ndef sumsquares(low, high):\n    return summation(low, high, lambda x: x**2, lambda x: x+1)\n\nprint(sumsquares(1, 10))\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/sum.txt b/v3/example-code/sum.txt
index 99a8ace18..3fe651044 100644
--- a/v3/example-code/sum.txt
+++ b/v3/example-code/sum.txt
@@ -13,4 +13,4 @@ def summation(low, high, f, next):
 def sumsquares(low, high):
     return summation(low, high, lambda x: x**2, lambda x: x+1)
 
-print sumsquares(1, 10)
+print(sumsquares(1, 10))
diff --git a/v3/example-code/wentworth_gcd.golden b/v3/example-code/wentworth_gcd.golden
index 8a93dfeec..cc0273cb0 100644
--- a/v3/example-code/wentworth_gcd.golden
+++ b/v3/example-code/wentworth_gcd.golden
@@ -1,5 +1,5 @@
 {
-  "code": "# Tutorial code from Prof. Peter Wentworth\n# Rhodes University, South Africa (http://www.ru.ac.za/)\n\ndef gcd(x, y, depth=1):\n    '''\n    Find the greatest common divisor of x, y\n    Pre:  x >= y,  y >= 0, both x and y are int\n    '''\n    result = x       # set provisional return value\n    if y != 0:\n        indent = \"**\" * depth\n        print(\"%s About to recursively call gcd(%d, %d)\" % (indent, y, x%y))\n        result = gcd(y, x % y, depth+1)\n        print(\"%s result is %d\" % (indent, result))\n    return result\n\ndef main():\n    m = 77\n    n = 28\n    print(\"Finding gcd(%d, %d)\" % (m,n))\n    g = gcd(m, n)\n    print('Greatest common divisor of %d, %d = %d'\n          % (m, n, g))\n\nmain()\n\n", 
+  "code": "# Tutorial code from Prof. Peter Wentworth\n# Rhodes University, South Africa (http://www.ru.ac.za/)\n\ndef gcd(x, y, depth=1):\n    '''\n    Find the greatest common divisor of x, y\n    Pre:  x >= y,  y >= 0, both x and y are int\n    '''\n    result = x       # set provisional return value\n    if y != 0:\n        indent = \"**\" * depth\n        print((\"%s About to recursively call gcd(%d, %d)\" % (indent, y, x%y)))\n        result = gcd(y, x % y, depth+1)\n        print((\"%s result is %d\" % (indent, result)))\n    return result\n\ndef main():\n    m = 77\n    n = 28\n    print((\"Finding gcd(%d, %d)\" % (m,n)))\n    g = gcd(m, n)\n    print(('Greatest common divisor of %d, %d = %d'\n          % (m, n, g)))\n\nmain()\n\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/wentworth_gcd.txt b/v3/example-code/wentworth_gcd.txt
index b9d544fbd..683beffc2 100644
--- a/v3/example-code/wentworth_gcd.txt
+++ b/v3/example-code/wentworth_gcd.txt
@@ -9,18 +9,18 @@ def gcd(x, y, depth=1):
     result = x       # set provisional return value
     if y != 0:
         indent = "**" * depth
-        print("%s About to recursively call gcd(%d, %d)" % (indent, y, x%y))
+        print(("%s About to recursively call gcd(%d, %d)" % (indent, y, x%y)))
         result = gcd(y, x % y, depth+1)
-        print("%s result is %d" % (indent, result))
+        print(("%s result is %d" % (indent, result)))
     return result
 
 def main():
     m = 77
     n = 28
-    print("Finding gcd(%d, %d)" % (m,n))
+    print(("Finding gcd(%d, %d)" % (m,n)))
     g = gcd(m, n)
-    print('Greatest common divisor of %d, %d = %d'
-          % (m, n, g))
+    print(('Greatest common divisor of %d, %d = %d'
+          % (m, n, g)))
 
 main()
 
diff --git a/v3/example-code/wentworth_sumList.golden b/v3/example-code/wentworth_sumList.golden
index 0cf2dfaee..8809705d3 100644
--- a/v3/example-code/wentworth_sumList.golden
+++ b/v3/example-code/wentworth_sumList.golden
@@ -1,5 +1,5 @@
 {
-  "code": "# Tutorial code from Prof. Peter Wentworth\n# Rhodes University, South Africa (http://www.ru.ac.za/)\n\ndef sumList(xs):\n    '''\n    Sum a list that can contain nested lists.\n    Precondition: All leaf elements are numbers.\n    '''\n    sum = 0\n    for e in xs:\n        if type(e) is list:\n            print(\"Calling sumList(%s) recursively\" % e)\n            v = sumList(e)\n            print(\"sumList(%s) returned %s\" % (e, v))\n            sum += v\n        else:\n            sum += e\n    return sum\n\n\ntestData = [10, [20, 30, [40], 50], 60]\nprint(\"Calling sumList(%s)\" % testData)\nresult = sumList(testData)\nprint(\"Final sum of all numbers in initial list is %s\" % result)\n\n", 
+  "code": "# Tutorial code from Prof. Peter Wentworth\n# Rhodes University, South Africa (http://www.ru.ac.za/)\n\ndef sumList(xs):\n    '''\n    Sum a list that can contain nested lists.\n    Precondition: All leaf elements are numbers.\n    '''\n    sum = 0\n    for e in xs:\n        if type(e) is list:\n            print((\"Calling sumList(%s) recursively\" % e))\n            v = sumList(e)\n            print((\"sumList(%s) returned %s\" % (e, v)))\n            sum += v\n        else:\n            sum += e\n    return sum\n\n\ntestData = [10, [20, 30, [40], 50], 60]\nprint((\"Calling sumList(%s)\" % testData))\nresult = sumList(testData)\nprint((\"Final sum of all numbers in initial list is %s\" % result))\n\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/wentworth_sumList.txt b/v3/example-code/wentworth_sumList.txt
index e286c2d69..30727f674 100644
--- a/v3/example-code/wentworth_sumList.txt
+++ b/v3/example-code/wentworth_sumList.txt
@@ -9,9 +9,9 @@ def sumList(xs):
     sum = 0
     for e in xs:
         if type(e) is list:
-            print("Calling sumList(%s) recursively" % e)
+            print(("Calling sumList(%s) recursively" % e))
             v = sumList(e)
-            print("sumList(%s) returned %s" % (e, v))
+            print(("sumList(%s) returned %s" % (e, v)))
             sum += v
         else:
             sum += e
@@ -19,7 +19,7 @@ def sumList(xs):
 
 
 testData = [10, [20, 30, [40], 50], 60]
-print("Calling sumList(%s)" % testData)
+print(("Calling sumList(%s)" % testData))
 result = sumList(testData)
-print("Final sum of all numbers in initial list is %s" % result)
+print(("Final sum of all numbers in initial list is %s" % result))
 
diff --git a/v3/example-code/wentworth_try_finally.golden b/v3/example-code/wentworth_try_finally.golden
index 45fab6dd9..f305d1d32 100644
--- a/v3/example-code/wentworth_try_finally.golden
+++ b/v3/example-code/wentworth_try_finally.golden
@@ -1,5 +1,5 @@
 {
-  "code": "# Tutorial code from Prof. Peter Wentworth\n# Rhodes University, South Africa (http://www.ru.ac.za/)\n\n# Demonstrate recursion that throws an exception\n# at its base case, and the tracing of try ... finally.\n#\n# How many \"survived!\" messages will be printed???\n\ndef f(n):\n    try:\n        x = 10 / n\n        print \"x is\", x\n        f(n-1)\n        print \"survived!\"\n    finally:\n        print \"Bye from f where n =\", n\n\nf(4)\n", 
+  "code": "# Tutorial code from Prof. Peter Wentworth\n# Rhodes University, South Africa (http://www.ru.ac.za/)\n\n# Demonstrate recursion that throws an exception\n# at its base case, and the tracing of try ... finally.\n#\n# How many \"survived!\" messages will be printed???\n\ndef f(n):\n    try:\n        x = 10 / n\n        print(\"x is \" + str(x))\n        f(n-1)\n        print(\"survived!\")\n    finally:\n        print(\"Bye from f where n = \" + str(n))\n\nf(4)\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/wentworth_try_finally.txt b/v3/example-code/wentworth_try_finally.txt
index daab5e33c..b6617fa56 100644
--- a/v3/example-code/wentworth_try_finally.txt
+++ b/v3/example-code/wentworth_try_finally.txt
@@ -9,10 +9,10 @@
 def f(n):
     try:
         x = 10 / n
-        print "x is", x
+        print("x is " + str(x))
         f(n-1)
-        print "survived!"
+        print("survived!")
     finally:
-        print "Bye from f where n =", n
+        print("Bye from f where n = " + str(n))
 
 f(4)

From fcc05598804d3bf02018d581e44306435c900a84 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 23:33:05 -0700
Subject: [PATCH 221/502] re-org'ed tutor.html and some misc.

---
 v3/example-code/decorators.golden |    2 +-
 v3/example-code/decorators.txt    |    4 +-
 v3/example-code/for-else.golden   | 1634 +++++++++++++++++++++++++++++
 v3/example-code/for-else.txt      |    9 +
 v3/example-code/varargs.golden    | 1015 ++++++++++++++++++
 v3/example-code/varargs.txt       |   16 +
 v3/js/opt-frontend.js             |   12 +-
 v3/tutor.html                     |   94 +-
 8 files changed, 2733 insertions(+), 53 deletions(-)
 create mode 100644 v3/example-code/for-else.golden
 create mode 100644 v3/example-code/for-else.txt
 create mode 100644 v3/example-code/varargs.golden
 create mode 100644 v3/example-code/varargs.txt

diff --git a/v3/example-code/decorators.golden b/v3/example-code/decorators.golden
index ad72b89be..f2723f388 100644
--- a/v3/example-code/decorators.golden
+++ b/v3/example-code/decorators.golden
@@ -1,5 +1,5 @@
 {
-  "code": "def make_bold(fn):\n  return lambda : \"\" + fn() + \"\"\n\ndef make_italic(fn):\n  return lambda : \"\" + fn() + \"\"\n\n@make_bold\n@make_italic\ndef hello():\n  return \"hello world\"\n  \nhelloHTML = hello()\n", 
+  "code": "def make_bold(fn):\n    return lambda : \"\" + fn() + \"\"\n\ndef make_italic(fn):\n    return lambda : \"\" + fn() + \"\"\n\n@make_bold\n@make_italic\ndef hello():\n  return \"hello world\"\n  \nhelloHTML = hello()\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/decorators.txt b/v3/example-code/decorators.txt
index b73b335f8..b267bac5f 100644
--- a/v3/example-code/decorators.txt
+++ b/v3/example-code/decorators.txt
@@ -1,8 +1,8 @@
 def make_bold(fn):
-  return lambda : "" + fn() + ""
+    return lambda : "" + fn() + ""
 
 def make_italic(fn):
-  return lambda : "" + fn() + ""
+    return lambda : "" + fn() + ""
 
 @make_bold
 @make_italic
diff --git a/v3/example-code/for-else.golden b/v3/example-code/for-else.golden
new file mode 100644
index 000000000..6d0d7606a
--- /dev/null
+++ b/v3/example-code/for-else.golden
@@ -0,0 +1,1634 @@
+{
+  "code": "# find primes using a for-else construct\nfor n in range(2, 10):\n    x_range = range(2, n)\n    for x in x_range:\n        if n % x == 0:\n            break\n    else:\n        # loop fell through without finding a factor\n        print n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "n": 2
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          1
+        ], 
+        "n": 2
+      }, 
+      "heap": {
+        "1": [
+          "LIST"
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          1
+        ], 
+        "n": 2
+      }, 
+      "heap": {
+        "1": [
+          "LIST"
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range"
+      ], 
+      "stdout": "2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          1
+        ], 
+        "n": 2
+      }, 
+      "heap": {
+        "1": [
+          "LIST"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range"
+      ], 
+      "stdout": "2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          1
+        ], 
+        "n": 3
+      }, 
+      "heap": {
+        "1": [
+          "LIST"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range"
+      ], 
+      "stdout": "2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          2
+        ], 
+        "n": 3
+      }, 
+      "heap": {
+        "2": [
+          "LIST", 
+          2
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          2
+        ], 
+        "n": 3, 
+        "x": 2
+      }, 
+      "heap": {
+        "2": [
+          "LIST", 
+          2
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          2
+        ], 
+        "n": 3, 
+        "x": 2
+      }, 
+      "heap": {
+        "2": [
+          "LIST", 
+          2
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          2
+        ], 
+        "n": 3, 
+        "x": 2
+      }, 
+      "heap": {
+        "2": [
+          "LIST", 
+          2
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          2
+        ], 
+        "n": 3, 
+        "x": 2
+      }, 
+      "heap": {
+        "2": [
+          "LIST", 
+          2
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          2
+        ], 
+        "n": 4, 
+        "x": 2
+      }, 
+      "heap": {
+        "2": [
+          "LIST", 
+          2
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          1
+        ], 
+        "n": 4, 
+        "x": 2
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          2, 
+          3
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          1
+        ], 
+        "n": 4, 
+        "x": 2
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          2, 
+          3
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          1
+        ], 
+        "n": 4, 
+        "x": 2
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          2, 
+          3
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          1
+        ], 
+        "n": 4, 
+        "x": 2
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          2, 
+          3
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          1
+        ], 
+        "n": 5, 
+        "x": 2
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          2, 
+          3
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          3
+        ], 
+        "n": 5, 
+        "x": 2
+      }, 
+      "heap": {
+        "3": [
+          "LIST", 
+          2, 
+          3, 
+          4
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          3
+        ], 
+        "n": 5, 
+        "x": 2
+      }, 
+      "heap": {
+        "3": [
+          "LIST", 
+          2, 
+          3, 
+          4
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n3\n", 
+      "func_name": "", 
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diff --git a/v3/example-code/for-else.txt b/v3/example-code/for-else.txt
new file mode 100644
index 000000000..b59907689
--- /dev/null
+++ b/v3/example-code/for-else.txt
@@ -0,0 +1,9 @@
+# find primes using a for-else construct
+for n in range(2, 10):
+    x_range = range(2, n)
+    for x in x_range:
+        if n % x == 0:
+            break
+    else:
+        # loop fell through without finding a factor
+        print n
diff --git a/v3/example-code/varargs.golden b/v3/example-code/varargs.golden
new file mode 100644
index 000000000..d12be8967
--- /dev/null
+++ b/v3/example-code/varargs.golden
@@ -0,0 +1,1015 @@
+{
+  "code": "# Demonstrate *args and **kwargs\ndef f1(a, b, *rest):\n    pass\n\nf1(1, 2)\nf1(1, 2, 3, 4, 5, 6, 7)\n\ndef f2(a, b, **kwrest):\n    pass\n\nf2(1, 2, name='Bob', age=38)\n\ndef f3(a, b, *rest, **kwrest):\n    pass\n\nf3(1, 2, 3, 4, name='Bob', age=38)\n", 
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+          "frame_id": 4, 
+          "encoded_locals": {
+            "a": 1, 
+            "__return__": null, 
+            "b": 2, 
+            "rest": [
+              "REF", 
+              8
+            ], 
+            "kwrest": [
+              "REF", 
+              7
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f3", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f3_f4", 
+          "ordered_varnames": [
+            "a", 
+            "b", 
+            "rest", 
+            "kwrest", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "f1": [
+          "REF", 
+          1
+        ], 
+        "f2": [
+          "REF", 
+          4
+        ], 
+        "f3": [
+          "REF", 
+          6
+        ]
+      }, 
+      "heap": {
+        "8": [
+          "TUPLE", 
+          3, 
+          4
+        ], 
+        "1": [
+          "FUNCTION", 
+          "f1(a, b, *rest)", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "f2(a, b, **kwrest)", 
+          null
+        ], 
+        "6": [
+          "FUNCTION", 
+          "f3(a, b, *rest, **kwrest)", 
+          null
+        ], 
+        "7": [
+          "DICT", 
+          [
+            "age", 
+            38
+          ], 
+          [
+            "name", 
+            "Bob"
+          ]
+        ]
+      }, 
+      "line": 14, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "f1", 
+        "f2", 
+        "f3"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "f1": [
+          "REF", 
+          1
+        ], 
+        "f2": [
+          "REF", 
+          4
+        ], 
+        "f3": [
+          "REF", 
+          6
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f1(a, b, *rest)", 
+          null
+        ], 
+        "4": [
+          "FUNCTION", 
+          "f2(a, b, **kwrest)", 
+          null
+        ], 
+        "6": [
+          "FUNCTION", 
+          "f3(a, b, *rest, **kwrest)", 
+          null
+        ]
+      }, 
+      "line": 16, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/example-code/varargs.txt b/v3/example-code/varargs.txt
new file mode 100644
index 000000000..97da39bb9
--- /dev/null
+++ b/v3/example-code/varargs.txt
@@ -0,0 +1,16 @@
+# Demonstrate *args and **kwargs
+def f1(a, b, *rest):
+    pass
+
+f1(1, 2)
+f1(1, 2, 3, 4, 5, 6, 7)
+
+def f2(a, b, **kwrest):
+    pass
+
+f2(1, 2, name='Bob', age=38)
+
+def f3(a, b, *rest, **kwrest):
+    pass
+
+f3(1, 2, 3, 4, name='Bob', age=38)
diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index a23f070f4..4195533db 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -62,7 +62,7 @@ $(document).ready(function() {
     extraKeys: {Tab: function(cm) {cm.replaceSelection("    ", "end");}}
   });
 
-  pyInputCodeMirror.setSize(null, '450px');
+  pyInputCodeMirror.setSize(null, '420px');
 
 
 
@@ -383,6 +383,16 @@ $(document).ready(function() {
     return false;
   });
 
+  $('#varargsLink').click(function() {
+    $.get("example-code/varargs.txt", setCodeMirrorVal);
+    return false;
+  });
+
+  $('#forElseLink').click(function() {
+    $.get("example-code/for-else.txt", setCodeMirrorVal);
+    return false;
+  });
+
 
   if (preseededCode) {
     setCodeMirrorVal(preseededCode);
diff --git a/v3/tutor.html b/v3/tutor.html
index 441f9baa4..0b0b7d9d6 100644
--- a/v3/tutor.html
+++ b/v3/tutor.html
@@ -72,72 +72,74 @@
 
Display exited functions

 
 
-
Try these small examples:

+
Basic Examples:

 
-aliasing |
+hello |
 intro |
+filter |
+tokenize |
+insertion sort
+

+
+
Mathy Stuff:

 factorial |
 fibonacci |
-memoized fib |
+memoized fibonacci |
 square root |
-insertion sort
-

-filter |
-tokenize |
-OOP |
 gcd |
-sumList |
-towers of hanoi |
-exceptions |
-sum cubes
-

-decorators |
-generators
-
+towers of hanoi
 

 
-
From MIT's 6.01 course:

-
-list map |
-summation |
-OOP 1 |
-OOP 2 |
-inheritance
-
+
Linked Lists:

+LL 1 |
+LL 2
 

 
-
Nested functions:
-

+
Higher-Order Functions:

 
 closure 1 |
 closure 2 |
 closure 3 |
 closure 4 |
-closure 5 |
+closure 5
+

+sum cubes |
+list map |
+summation |
 lambda param
 
 

 
-
Aliasing:
-

+
Object-Oriented Programming

+
+OOP 1 |
+OOP 2 |
+OOP 3 |
+inheritance
+
+

+
+
More Python Tricks:

+decorators |
+generators |
+varargs |
+exceptions |
+for-else
+

 
+
Pointer Aliasing:

 aliasing 1 |
 aliasing 2 |
 aliasing 3 |
-aliasing 4 |
+aliasing 4
+

 aliasing 5 |
 aliasing 6 |
 aliasing 7 |
-aliasing 8
-
+aliasing 8 |
+sumList
 

 
-
Linked lists:
-

-
-LL 1 |
-LL 2
-
 
 
 
@@ -156,20 +158,14 @@
 
 

 
-This version of the Online Python Tutor runs Python 2.7 on Google
-App Engine with limited module imports and no file I/O. It is
-designed for teaching programming, not for running or debugging
-production code.
+This version of Online Python Tutor runs Python 2.7 and Python 3.2 with limited module
+imports and no file I/O. It is designed for teaching programming, not
+for running or debugging production code.
 
 

 
-
Official Python 3 support is coming soon;
-for now, try the Python 3 forks by CS Circles and
-Peter Wentworth.
-
 

 Check out the GitHub

From ebd2b877facb91bc9c0245f8ab9f18bbe3adb743 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 23:41:43 -0700
Subject: [PATCH 222/502] more superficial tweaks

---
 v3/css/pytutor.css |  2 +-
 v3/tutor.html      | 18 +++++++++---------
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 62e79ad4a..3ee83269c 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -74,7 +74,7 @@ div.ExecutionVisualizer table.frameDataViz td.val {
 
 div.ExecutionVisualizer div#pyCodeOutputDiv {
   max-width: 550px;
-  max-height: 450px;
+  max-height: 400px;
   /*max-height: 620px;*/
   overflow: auto;
   /*margin-bottom: 4px;*/
diff --git a/v3/tutor.html b/v3/tutor.html
index 0b0b7d9d6..f45238cb7 100644
--- a/v3/tutor.html
+++ b/v3/tutor.html
@@ -81,7 +81,7 @@
 insertion sort
 

 
-
Mathy Stuff:

+
Mathy Stuff:

 factorial |
 fibonacci |
 memoized fibonacci |
@@ -90,27 +90,27 @@
 towers of hanoi
 

 
-
Linked Lists:

+
Linked Lists:

 LL 1 |
 LL 2
 

 
-
Higher-Order Functions:

+
Higher-Order Functions:

 
 closure 1 |
 closure 2 |
 closure 3 |
-closure 4 |
-closure 5
+closure 4
 

-sum cubes |
+
+closure 5 |
 list map |
 summation |
 lambda param
 
 

 
-
Object-Oriented Programming

+
Object-Oriented Programming

 
 OOP 1 |
 OOP 2 |
@@ -119,7 +119,7 @@
 
 

 
-
More Python Tricks:

+
More Python Tricks:

 decorators |
 generators |
 varargs |
@@ -127,7 +127,7 @@
 for-else
 

 
-
Pointer Aliasing:

+
Pointer Aliasing:

 aliasing 1 |
 aliasing 2 |
 aliasing 3 |

From dc9246bb60f2398c6eaccc8978181ea0f60adc63 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 3 Sep 2012 23:51:13 -0700
Subject: [PATCH 223/502] one more example

---
 v3/example-code/list-comp.golden | 404 +++++++++++++++++++++++++++++++
 v3/example-code/list-comp.txt    |   3 +
 v3/js/opt-frontend.js            |   5 +
 v3/tutor.html                    |  27 ++-
 4 files changed, 426 insertions(+), 13 deletions(-)
 create mode 100644 v3/example-code/list-comp.golden
 create mode 100644 v3/example-code/list-comp.txt

diff --git a/v3/example-code/list-comp.golden b/v3/example-code/list-comp.golden
new file mode 100644
index 000000000..6a4ea270a
--- /dev/null
+++ b/v3/example-code/list-comp.golden
@@ -0,0 +1,404 @@
+{
+  "code": "ppl = ['Alice', 'Bob', 'Carol', 'Doug']\nexcited_ppl = [e + '!!' for e in ppl]\nppl_len = [len(x) for x in ppl]\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "ppl"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "ppl": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "Alice", 
+          "Bob", 
+          "Carol", 
+          "Doug"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "ppl", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "e": "Alice", 
+        "ppl": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "Alice", 
+          "Bob", 
+          "Carol", 
+          "Doug"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "ppl", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "e": "Bob", 
+        "ppl": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "Alice", 
+          "Bob", 
+          "Carol", 
+          "Doug"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "ppl", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "e": "Carol", 
+        "ppl": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "Alice", 
+          "Bob", 
+          "Carol", 
+          "Doug"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "ppl", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "e": "Doug", 
+        "ppl": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "Alice", 
+          "Bob", 
+          "Carol", 
+          "Doug"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "ppl", 
+        "e", 
+        "excited_ppl"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "e": "Doug", 
+        "excited_ppl": [
+          "REF", 
+          2
+        ], 
+        "ppl": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "Alice", 
+          "Bob", 
+          "Carol", 
+          "Doug"
+        ], 
+        "2": [
+          "LIST", 
+          "Alice!!", 
+          "Bob!!", 
+          "Carol!!", 
+          "Doug!!"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "ppl", 
+        "e", 
+        "excited_ppl", 
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "e": "Doug", 
+        "ppl": [
+          "REF", 
+          1
+        ], 
+        "excited_ppl": [
+          "REF", 
+          2
+        ], 
+        "x": "Alice"
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "Alice", 
+          "Bob", 
+          "Carol", 
+          "Doug"
+        ], 
+        "2": [
+          "LIST", 
+          "Alice!!", 
+          "Bob!!", 
+          "Carol!!", 
+          "Doug!!"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "ppl", 
+        "e", 
+        "excited_ppl", 
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "e": "Doug", 
+        "ppl": [
+          "REF", 
+          1
+        ], 
+        "excited_ppl": [
+          "REF", 
+          2
+        ], 
+        "x": "Bob"
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "Alice", 
+          "Bob", 
+          "Carol", 
+          "Doug"
+        ], 
+        "2": [
+          "LIST", 
+          "Alice!!", 
+          "Bob!!", 
+          "Carol!!", 
+          "Doug!!"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "ppl", 
+        "e", 
+        "excited_ppl", 
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "e": "Doug", 
+        "ppl": [
+          "REF", 
+          1
+        ], 
+        "excited_ppl": [
+          "REF", 
+          2
+        ], 
+        "x": "Carol"
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "Alice", 
+          "Bob", 
+          "Carol", 
+          "Doug"
+        ], 
+        "2": [
+          "LIST", 
+          "Alice!!", 
+          "Bob!!", 
+          "Carol!!", 
+          "Doug!!"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "ppl", 
+        "e", 
+        "excited_ppl", 
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "e": "Doug", 
+        "ppl": [
+          "REF", 
+          1
+        ], 
+        "excited_ppl": [
+          "REF", 
+          2
+        ], 
+        "x": "Doug"
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "Alice", 
+          "Bob", 
+          "Carol", 
+          "Doug"
+        ], 
+        "2": [
+          "LIST", 
+          "Alice!!", 
+          "Bob!!", 
+          "Carol!!", 
+          "Doug!!"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "ppl", 
+        "e", 
+        "excited_ppl", 
+        "x", 
+        "ppl_len"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "excited_ppl": [
+          "REF", 
+          2
+        ], 
+        "ppl_len": [
+          "REF", 
+          3
+        ], 
+        "e": "Doug", 
+        "x": "Doug", 
+        "ppl": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "Alice", 
+          "Bob", 
+          "Carol", 
+          "Doug"
+        ], 
+        "2": [
+          "LIST", 
+          "Alice!!", 
+          "Bob!!", 
+          "Carol!!", 
+          "Doug!!"
+        ], 
+        "3": [
+          "LIST", 
+          5, 
+          3, 
+          5, 
+          4
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/example-code/list-comp.txt b/v3/example-code/list-comp.txt
new file mode 100644
index 000000000..b5a158904
--- /dev/null
+++ b/v3/example-code/list-comp.txt
@@ -0,0 +1,3 @@
+ppl = ['Alice', 'Bob', 'Carol', 'Doug']
+excited_ppl = [e + '!!' for e in ppl]
+ppl_len = [len(x) for x in ppl]
diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 4195533db..2ace11303 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -213,6 +213,11 @@ $(document).ready(function() {
     return false;
   });
 
+  $("#listCompLink").click(function() {
+    $.get("example-code/list-comp.txt", setCodeMirrorVal);
+    return false;
+  });
+
   $("#fibonacciExampleLink").click(function() {
     $.get("example-code/fib.txt", setCodeMirrorVal);
     return false;
diff --git a/v3/tutor.html b/v3/tutor.html
index f45238cb7..8ddeb27f4 100644
--- a/v3/tutor.html
+++ b/v3/tutor.html
@@ -78,10 +78,11 @@
 intro |
 filter |
 tokenize |
-insertion sort
+insertion sort |
+list comprehension
 

 
-
Mathy Stuff:

+
Math-Related Fun:

 factorial |
 fibonacci |
 memoized fibonacci |
@@ -90,11 +91,6 @@
 towers of hanoi
 

 
-
Linked Lists:

-LL 1 |
-LL 2
-

-
 
Higher-Order Functions:

 
 closure 1 |
@@ -119,12 +115,9 @@
 
 

 
-
More Python Tricks:

-decorators |
-generators |
-varargs |
-exceptions |
-for-else
+
Linked Lists:

+LL 1 |
+LL 2
 

 
 
Pointer Aliasing:

@@ -140,6 +133,14 @@
 sumList
 

 
+
More Python Tricks:

+decorators |
+generators |
+varargs |
+exceptions |
+for-else
+

+
 
 
 

From 59b6fde2d55dcfd7aa04296bd7c3984197e9439f Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 4 Sep 2012 11:18:08 -0700
Subject: [PATCH 224/502] clear URL output for cleanliness

---
 v3/js/opt-frontend.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 2ace11303..da45f120f 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -48,6 +48,7 @@ var pyInputCodeMirror; // CodeMirror object that contains the input text
 
 function setCodeMirrorVal(dat) {
   pyInputCodeMirror.setValue(dat.rtrim() /* kill trailing spaces */);
+  $('#urlOutput').val('');
 }
 
 
@@ -191,7 +192,9 @@ $(document).ready(function() {
 
               myVisualizer = new ExecutionVisualizer('pyOutputPane',
                                                      dataFromBackend,
-                                                     {startingInstruction: startingInstruction});
+                                                     {startingInstruction:  startingInstruction,
+                                                      updateOutputCallback: function() {$('#urlOutput').val('');}
+                                                     });
 
               $.bbq.pushState({ mode: 'visualize' }, 2 /* completely override other hash strings to keep URL clean */);
             }

From 9b0a455c0c025ca54aa5c61605c3c6e7db0eddad Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 4 Sep 2012 11:57:43 -0700
Subject: [PATCH 225/502] added Python 2/3 dropdown option

---
 v3/js/opt-frontend.js | 22 +++++++++++++++++++---
 v3/tutor.html         | 17 ++++++++++++++---
 2 files changed, 33 insertions(+), 6 deletions(-)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index da45f120f..2911beb62 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -75,9 +75,24 @@ $(document).ready(function() {
     preseededCode = $.bbq.getState('code'); // yuck, global!
     var preseededMode = $.bbq.getState('mode');
 
+
+    // ugh, ugly tristate due to the possibility of being undefined :)
     if ($.bbq.getState('cumulative_mode') == 'true') {
-      $('#cumulativeMode').prop('checked', true);
+      $('#cumulativeModeSelector').val('yes');
+    }
+    else if ($.bbq.getState('cumulative_mode') == 'false') {
+      $('#cumulativeModeSelector').val('no');
+    }
+    // else if it's undefined, don't do anything ...
+
+    if ($.bbq.getState('python_version') == '3') {
+      $('#pythonVersionSelector').val('3');
+    }
+    else if ($.bbq.getState('python_version') == '2') {
+      $('#pythonVersionSelector').val('2');
     }
+    // else if it's undefined, don't do anything ...
+
 
     // only bother with curInstr when we're visualizing ...
     if (!preseededCurInstr && preseededMode == 'visualize') { // TODO: kinda gross hack
@@ -149,7 +164,7 @@ $(document).ready(function() {
 
     $.get(backend_script,
           {user_script : pyInputCodeMirror.getValue(),
-           cumulative_mode: $('#cumulativeMode').prop('checked')},
+           cumulative_mode: ($('#cumulativeModeSelector').val() == 'yes')},
           function(dataFromBackend) {
             var trace = dataFromBackend.trace;
             
@@ -436,7 +451,8 @@ $(document).ready(function() {
                                   {code: pyInputCodeMirror.getValue(),
                                    curInstr: (appMode == 'visualize') ? myVisualizer.curInstr : 0,
                                    mode: appMode,
-                                   cumulative_mode: $('#cumulativeMode').prop('checked')
+                                   cumulative_mode: ($('#cumulativeModeSelector').val() == 'yes'),
+                                   python_version: $('#pythonVersionSelector').val()
                                   },
                                   2);
     $('#urlOutput').val(urlStr);
diff --git a/v3/tutor.html b/v3/tutor.html
index 8ddeb27f4..2a1199807 100644
--- a/v3/tutor.html
+++ b/v3/tutor.html
@@ -65,12 +65,23 @@
 
 
 
 
+

+Execute code using
+  
+and
+  
+

+
 

 
 

 
-
Display exited functions

-
 
 
Basic Examples:

 
@@ -159,7 +170,7 @@
 
 

 
-This version of Online Python Tutor runs Python 2.7 and Python 3.2 with limited module
 imports and no file I/O. It is designed for teaching programming, not

From 61282683881348d2666e2edbf16ac7dfc8d51f23 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 4 Sep 2012 11:59:34 -0700
Subject: [PATCH 226/502] made closure examples 4-space indented

---
 v3/example-code/closures/closure1.golden |  2 +-
 v3/example-code/closures/closure1.txt    |  6 +++---
 v3/example-code/closures/closure2.golden |  2 +-
 v3/example-code/closures/closure2.txt    | 12 ++++++------
 v3/example-code/closures/closure3.golden |  2 +-
 v3/example-code/closures/closure3.txt    | 10 +++++-----
 v3/example-code/closures/closure4.golden |  2 +-
 v3/example-code/closures/closure4.txt    |  6 +++---
 v3/example-code/closures/closure5.golden |  2 +-
 v3/example-code/closures/closure5.txt    | 10 +++++-----
 10 files changed, 27 insertions(+), 27 deletions(-)

diff --git a/v3/example-code/closures/closure1.golden b/v3/example-code/closures/closure1.golden
index 60b1b4eab..72c708a07 100644
--- a/v3/example-code/closures/closure1.golden
+++ b/v3/example-code/closures/closure1.golden
@@ -1,5 +1,5 @@
 {
-  "code": "def foo(y):\n def bar(x):\n   return x + y\n return bar\n\nb = foo(1)\nb(2)\n", 
+  "code": "def foo(y):\n    def bar(x):\n        return x + y\n    return bar\n\nb = foo(1)\nb(2)\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/closures/closure1.txt b/v3/example-code/closures/closure1.txt
index 674c82bb2..1b784657b 100644
--- a/v3/example-code/closures/closure1.txt
+++ b/v3/example-code/closures/closure1.txt
@@ -1,7 +1,7 @@
 def foo(y):
- def bar(x):
-   return x + y
- return bar
+    def bar(x):
+        return x + y
+    return bar
 
 b = foo(1)
 b(2)
diff --git a/v3/example-code/closures/closure2.golden b/v3/example-code/closures/closure2.golden
index 044859126..37b206be9 100644
--- a/v3/example-code/closures/closure2.golden
+++ b/v3/example-code/closures/closure2.golden
@@ -1,5 +1,5 @@
 {
-  "code": "def foo(y):\n  def bar(x):\n    return x + y\n  return bar\n\ndef foo_deux(y):\n  def bar_deux(x):\n    return x + y\n  return bar_deux\n\nb = foo(1)\nb_deux = foo_deux(1000)\n\nb(2)    \nb_deux(2000)\n", 
+  "code": "def foo(y):\n    def bar(x):\n        return x + y\n    return bar\n\ndef foo_deux(y):\n    def bar_deux(x):\n        return x + y\n    return bar_deux\n\nb = foo(1)\nb_deux = foo_deux(1000)\n\nb(2)    \nb_deux(2000)\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/closures/closure2.txt b/v3/example-code/closures/closure2.txt
index dee3a5fd6..dd036ff92 100644
--- a/v3/example-code/closures/closure2.txt
+++ b/v3/example-code/closures/closure2.txt
@@ -1,12 +1,12 @@
 def foo(y):
-  def bar(x):
-    return x + y
-  return bar
+    def bar(x):
+        return x + y
+    return bar
 
 def foo_deux(y):
-  def bar_deux(x):
-    return x + y
-  return bar_deux
+    def bar_deux(x):
+        return x + y
+    return bar_deux
 
 b = foo(1)
 b_deux = foo_deux(1000)
diff --git a/v3/example-code/closures/closure3.golden b/v3/example-code/closures/closure3.golden
index 1f347f420..43b4b2ecb 100644
--- a/v3/example-code/closures/closure3.golden
+++ b/v3/example-code/closures/closure3.golden
@@ -1,5 +1,5 @@
 {
-  "code": "def foo(x):\n def bar(y):\n   def baz(z):\n     return len(x) + len(y) + len(z)\n   return baz\n return bar([4,5,6,7])\n\nl = [1,2,3]\nx = foo(l)\nx([8,9,10,11,12])\n", 
+  "code": "def foo(x):\n    def bar(y):\n        def baz(z):\n            return len(x) + len(y) + len(z)\n        return baz\n    return bar([4,5,6,7])\n\nl = [1,2,3]\nx = foo(l)\nx([8,9,10,11,12])\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/closures/closure3.txt b/v3/example-code/closures/closure3.txt
index 7e3eb523a..9a34ed2d1 100644
--- a/v3/example-code/closures/closure3.txt
+++ b/v3/example-code/closures/closure3.txt
@@ -1,9 +1,9 @@
 def foo(x):
- def bar(y):
-   def baz(z):
-     return len(x) + len(y) + len(z)
-   return baz
- return bar([4,5,6,7])
+    def bar(y):
+        def baz(z):
+            return len(x) + len(y) + len(z)
+        return baz
+    return bar([4,5,6,7])
 
 l = [1,2,3]
 x = foo(l)
diff --git a/v3/example-code/closures/closure4.golden b/v3/example-code/closures/closure4.golden
index 268bc8945..3b39773ee 100644
--- a/v3/example-code/closures/closure4.golden
+++ b/v3/example-code/closures/closure4.golden
@@ -1,5 +1,5 @@
 {
-  "code": "def f(x):\n  def g(y):\n    return x + y\n  return g\n\ng1 = f(1)\ng2 = f(2)\ng1(3) + g2(4)\n", 
+  "code": "def f(x):\n    def g(y):\n        return x + y\n    return g\n\ng1 = f(1)\ng2 = f(2)\ng1(3) + g2(4)\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/closures/closure4.txt b/v3/example-code/closures/closure4.txt
index 2947e96be..664625712 100644
--- a/v3/example-code/closures/closure4.txt
+++ b/v3/example-code/closures/closure4.txt
@@ -1,7 +1,7 @@
 def f(x):
-  def g(y):
-    return x + y
-  return g
+    def g(y):
+        return x + y
+    return g
 
 g1 = f(1)
 g2 = f(2)
diff --git a/v3/example-code/closures/closure5.golden b/v3/example-code/closures/closure5.golden
index 22e743525..549e7897d 100644
--- a/v3/example-code/closures/closure5.golden
+++ b/v3/example-code/closures/closure5.golden
@@ -1,5 +1,5 @@
 {
-  "code": "def f(x):\n  def g(y, z):\n    if z == 0:\n      return y\n    return g(x+y+z, z-1)\n  return lambda: g(0, x)\n\nfoo = f(3)\nbar = f(4)\nbaz = foo() + bar()\n", 
+  "code": "def f(x):\n    def g(y, z):\n        if z == 0:\n            return y\n        return g(x+y+z, z-1)\n    return lambda: g(0, x)\n\nfoo = f(3)\nbar = f(4)\nbaz = foo() + bar()\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/closures/closure5.txt b/v3/example-code/closures/closure5.txt
index 9484abcb0..df094d247 100644
--- a/v3/example-code/closures/closure5.txt
+++ b/v3/example-code/closures/closure5.txt
@@ -1,9 +1,9 @@
 def f(x):
-  def g(y, z):
-    if z == 0:
-      return y
-    return g(x+y+z, z-1)
-  return lambda: g(0, x)
+    def g(y, z):
+        if z == 0:
+            return y
+        return g(x+y+z, z-1)
+    return lambda: g(0, x)
 
 foo = f(3)
 bar = f(4)

From a31307764ebdeca728c08fb16b19e9229787fa19 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 4 Sep 2012 13:20:00 -0700
Subject: [PATCH 227/502] getting ready for demo release

---
 v3/js/opt-frontend.js | 23 ++++++++++++++++++++++-
 v3/tutor.html         | 13 +++++--------
 v3/web_exec.py        |  2 +-
 3 files changed, 28 insertions(+), 10 deletions(-)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 2911beb62..45867224b 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -29,7 +29,14 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 // Pre-reqs: pytutor.js and jquery.ba-bbq.min.js should be imported BEFORE this file
 
-var backend_script = 'exec'; // URL of backend script, which must eventually call pg_logger.py
+
+// backend scripts to execute (Python 2 and 3 variants, if available)
+var python2_backend_script = 'web_exec_py2.py';
+var python3_backend_script = 'web_exec_py3.py';
+
+// uncomment below if you're running on Google App Engine using the built-in app.yaml
+//var python2_backend_script = 'exec';
+//var python3_backend_script = null;
 
 var appMode = 'edit'; // 'edit' or 'visualize'
 
@@ -157,6 +164,20 @@ $(document).ready(function() {
 
   $("#executeBtn").attr('disabled', false);
   $("#executeBtn").click(function() {
+
+    var backend_script = null;
+    if ($('#pythonVersionSelector').val() == '2') {
+        backend_script = python2_backend_script;
+    }
+    else if ($('#pythonVersionSelector').val() == '3') {
+        backend_script = python3_backend_script;
+    }
+
+    if (!backend_script) {
+      alert('Error: This server is not configured to run Python ' + $('#pythonVersionSelector').val());
+      return;
+    }
+
     $('#executeBtn').html("Please wait ... processing your code");
     $('#executeBtn').attr('disabled', true);
     $("#pyOutputPane").hide();
diff --git a/v3/tutor.html b/v3/tutor.html
index 2a1199807..5b748bf3c 100644
--- a/v3/tutor.html
+++ b/v3/tutor.html
@@ -164,9 +164,9 @@
    
 

 
-
To report a bug, click the 'Generate URL' button, paste the URL along
-with a brief error description in an email, and then send an email to
-philip@pgbovine.net

+
To report a bug (or suggestion), click the 'Generate URL' button,
+paste the URL along with a brief error description in an email, and then
+send an email to philip@pgbovine.net

 
 

 
@@ -174,14 +174,11 @@
 href="http://www.python.org/doc/2.7/">Python 2.7 and Python 3.2 with limited module
 imports and no file I/O. It is designed for teaching programming, not
-for running or debugging production code.
+for running or debugging production code. The code is open source on GitHub.
 
 

 
-

-Check out the GitHub
-repository and send bug reports, feedback, and suggestions to philip@pgbovine.net
 
 

 Copyright © 2010-2012 Philip Guo.  All rights reserved.
diff --git a/v3/web_exec.py b/v3/web_exec.py
index 4ee89a00d..229cb841b 100644
--- a/v3/web_exec.py
+++ b/v3/web_exec.py
@@ -19,7 +19,7 @@
 
 
 # set to true if you want to log queries in DB_FILE 
-LOG_QUERIES = True
+LOG_QUERIES = False
 
 if LOG_QUERIES:
   import os, datetime, create_log_db, sqlite3

From 9f2e299a93f3d8cf14fcd72b68ffde9d146bf662 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 4 Sep 2012 13:29:58 -0700
Subject: [PATCH 228/502] minor cosmetic

---
 v3/tutor.html | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/v3/tutor.html b/v3/tutor.html
index 5b748bf3c..444078ab0 100644
--- a/v3/tutor.html
+++ b/v3/tutor.html
@@ -164,9 +164,10 @@
    
 

 
-
To report a bug (or suggestion), click the 'Generate URL' button,
-paste the URL along with a brief error description in an email, and then
-send an email to philip@pgbovine.net

+
To report a bug, click the 'Generate URL' button, paste the URL along
+with a brief error description in an email, and send the email to
+philip@pgbovine.net
+

 
 

 
@@ -180,8 +181,9 @@
 

 
 
-

+

 Copyright © 2010-2012 Philip Guo.  All rights reserved.
+

 
 
 

From 862cda9dc59ac755d97b2e3c9c4b13e583841af8 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 4 Sep 2012 13:40:34 -0700
Subject: [PATCH 229/502] tiny update for Py3k compatibility

---
 v3/example-code/for-else.golden | 2 +-
 v3/example-code/for-else.txt    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/v3/example-code/for-else.golden b/v3/example-code/for-else.golden
index 6d0d7606a..479a67f6f 100644
--- a/v3/example-code/for-else.golden
+++ b/v3/example-code/for-else.golden
@@ -1,5 +1,5 @@
 {
-  "code": "# find primes using a for-else construct\nfor n in range(2, 10):\n    x_range = range(2, n)\n    for x in x_range:\n        if n % x == 0:\n            break\n    else:\n        # loop fell through without finding a factor\n        print n\n", 
+  "code": "# find primes using a for-else construct\nfor n in range(2, 10):\n    x_range = range(2, n)\n    for x in x_range:\n        if n % x == 0:\n            break\n    else:\n        # loop fell through without finding a factor\n        print(n)\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/example-code/for-else.txt b/v3/example-code/for-else.txt
index b59907689..1eaf5fff7 100644
--- a/v3/example-code/for-else.txt
+++ b/v3/example-code/for-else.txt
@@ -6,4 +6,4 @@ for n in range(2, 10):
             break
     else:
         # loop fell through without finding a factor
-        print n
+        print(n)

From c7a0ab8ad7f0b2daf2555e52205b60f4d7ea54ca Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 4 Sep 2012 14:15:14 -0700
Subject: [PATCH 230/502] added genexpr test

---
 v3/example-code/genexpr.golden | 2170 ++++++++++++++++++++++++++++++++
 v3/example-code/genexpr.txt    |    4 +
 v3/js/opt-frontend.js          |    5 +
 v3/tutor.html                  |    1 +
 4 files changed, 2180 insertions(+)
 create mode 100644 v3/example-code/genexpr.golden
 create mode 100644 v3/example-code/genexpr.txt

diff --git a/v3/example-code/genexpr.golden b/v3/example-code/genexpr.golden
new file mode 100644
index 000000000..85931e7a5
--- /dev/null
+++ b/v3/example-code/genexpr.golden
@@ -0,0 +1,2170 @@
+{
+  "code": "x = (i for i in range(10))\n\nfor e in x:\n    print(e)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "generator", 
+          " at 0xADDR>"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            ".0": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f1", 
+          "ordered_varnames": [
+            ".0"
+          ]
+        }
+      ], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "generator", 
+          " at 0xADDR>"
+        ], 
+        "2": [
+          "listiterator", 
+          ""
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            ".0": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f1", 
+          "ordered_varnames": [
+            ".0"
+          ]
+        }
+      ], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "generator", 
+          " at 0xADDR>"
+        ], 
+        "2": [
+          "listiterator", 
+          ""
+        ]
+      }, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            ".0": [
+              "REF", 
+              2
+            ], 
+            "i": 0, 
+            "__return__": 0
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f1", 
+          "ordered_varnames": [
+            ".0", 
+            "i", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "generator", 
+          " at 0xADDR>"
+        ], 
+        "2": [
+          "listiterator", 
+          ""
+        ]
+      }, 
+      "line": 1, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": 0
+      }, 
+      "heap": {
+        "1": [
+          "generator", 
+          " at 0xADDR>"
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "e"
+      ], 
+      "stdout": "0\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": 0
+      }, 
+      "heap": {
+        "1": [
+          "generator", 
+          " at 0xADDR>"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "e"
+      ], 
+      "stdout": "0\n", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            ".0": [
+              "REF", 
+              2
+            ], 
+            "i": 0
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2", 
+          "ordered_varnames": [
+            ".0", 
+            "i"
+          ]
+        }
+      ], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": 0
+      }, 
+      "heap": {
+        "1": [
+          "generator", 
+          " at 0xADDR>"
+        ], 
+        "2": [
+          "listiterator", 
+          ""
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "e"
+      ], 
+      "stdout": "0\n", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            ".0": [
+              "REF", 
+              2
+            ], 
+            "i": 0
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2", 
+          "ordered_varnames": [
+            ".0", 
+            "i"
+          ]
+        }
+      ], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": 0
+      }, 
+      "heap": {
+        "1": [
+          "generator", 
+          " at 0xADDR>"
+        ], 
+        "2": [
+          "listiterator", 
+          ""
+        ]
+      }, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
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+    }, 
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+}
diff --git a/v3/example-code/genexpr.txt b/v3/example-code/genexpr.txt
new file mode 100644
index 000000000..5777d5f01
--- /dev/null
+++ b/v3/example-code/genexpr.txt
@@ -0,0 +1,4 @@
+x = (i for i in range(10))
+
+for e in x:
+    print(e)
diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 45867224b..2727873a5 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -357,6 +357,11 @@ $(document).ready(function() {
     return false;
   });
 
+  $("#genExprLink").click(function() {
+    $.get("example-code/genexpr.txt", setCodeMirrorVal);
+    return false;
+  });
+
 
   $('#closure1Link').click(function() {
     $.get("example-code/closures/closure1.txt", setCodeMirrorVal);
diff --git a/v3/tutor.html b/v3/tutor.html
index 444078ab0..5ec019fc8 100644
--- a/v3/tutor.html
+++ b/v3/tutor.html
@@ -147,6 +147,7 @@
 
More Python Tricks:

 decorators |
 generators |
+gen expr |
 varargs |
 exceptions |
 for-else

From 39419be7c47c609fd78aade9b9cf633a99cf3f41 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 4 Sep 2012 14:22:22 -0700
Subject: [PATCH 231/502] added a thin border

---
 v3/css/opt-frontend.css | 1 +
 v3/tutor.html           | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/v3/css/opt-frontend.css b/v3/css/opt-frontend.css
index 465b24cc3..ae30640c8 100644
--- a/v3/css/opt-frontend.css
+++ b/v3/css/opt-frontend.css
@@ -54,6 +54,7 @@ table#pyOutputPane {
 #codeInputPane {
   margin-top: 5px;
   font-size: 12pt;
+  border: 1px solid #ddd;
 }
 
 button.smallBtn {
diff --git a/v3/tutor.html b/v3/tutor.html
index 5ec019fc8..f7e5d9298 100644
--- a/v3/tutor.html
+++ b/v3/tutor.html
@@ -65,7 +65,7 @@
 
 
 
 
-

+

 Execute code using
   \
@@ -196,6 +199,9 @@ ExecutionVisualizer.prototype.render = function() {
     \
   ');
 
+  this.domRoot.find('#legendDiv')
+    .append(lightArrowHTML + ' line that has just executed
' + darkArrowHTML + ' next line to be executed
')
+
 
   if (this.params.editCodeBaseURL) {
     var urlStr = $.param.fragment(this.params.editCodeBaseURL,
@@ -818,13 +824,23 @@ ExecutionVisualizer.prototype.updateOutput = function() {
 
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.gutter')
       .html(function (d) {
-        // arrow types: '\u21d2', '\u21f0', '\u2907'
-        return (d.lineNumber == arrowLineNumber) ? '\u21d2' : '';
+      // arrow types: '\u21d2', '\u21f0', '\u2907'
+      if (d.lineNumber == arrowLineNumber) {
+          return darkArrowHTML;
+        }
+        else if (d.lineNumber == highlightLineNumber) {
+          return lightArrowHTML;
+        }
+        else {
+          return '';
+        }
       });
 
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.lineNo')
       .attr('id', function(d) {return 'lineNo' + d.lineNumber;});
 
+    // optionally highlight previously-executed line ...
+    /*
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.cod')
       .style('background-color', function(d) {
         if (d.lineNumber == highlightLineNumber) {
@@ -836,6 +852,7 @@ ExecutionVisualizer.prototype.updateOutput = function() {
 
         return d.backgroundColor;
       });
+    */
 
 
     // returns True iff lineNo is visible in pyCodeOutputDiv

From 59346a520c7a1c6f834442308ffb6ac98d589c76 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 6 Sep 2012 08:58:48 -0700
Subject: [PATCH 244/502] minor stylistic nits

---
 v3/example-code/genexpr.txt | 1 +
 v3/js/pytutor.js            | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/v3/example-code/genexpr.txt b/v3/example-code/genexpr.txt
index 5777d5f01..46bac3e62 100644
--- a/v3/example-code/genexpr.txt
+++ b/v3/example-code/genexpr.txt
@@ -1,3 +1,4 @@
+# NB: there's a known bug when frames of exited functions are displayed
 x = (i for i in range(10))
 
 for e in x:
diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index eca65a462..b16b6c08c 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -200,7 +200,7 @@ ExecutionVisualizer.prototype.render = function() {
   ');
 
   this.domRoot.find('#legendDiv')
-    .append(lightArrowHTML + ' line that has just executed
' + darkArrowHTML + ' next line to be executed
')
+    .append(lightArrowHTML + ' line that has just executed
' + darkArrowHTML + ' next line to be executed
')
 
 
   if (this.params.editCodeBaseURL) {

From e6d977569d71e62628aac21090415e87ef044c5a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 6 Sep 2012 10:11:15 -0700
Subject: [PATCH 245/502] added sum-list example

---
 v3/example-code/sum-list.txt | 9 +++++++++
 v3/js/opt-frontend.js        | 4 ++++
 v3/tutor.html                | 3 ++-
 3 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 v3/example-code/sum-list.txt

diff --git a/v3/example-code/sum-list.txt b/v3/example-code/sum-list.txt
new file mode 100644
index 000000000..9945a6a6b
--- /dev/null
+++ b/v3/example-code/sum-list.txt
@@ -0,0 +1,9 @@
+myList = (1, (2, (3, (4, (5, None)))))
+
+def sumList(node, subtotal):
+  if not node:
+    return subtotal
+  else:
+    return sumList(node[1], subtotal + node[0])
+
+total = sumList(myList, 0)
diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 2baa740eb..717df4cd3 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -454,6 +454,10 @@ $(document).ready(function() {
     $.get("example-code/linked-lists/ll2.txt", setCodeMirrorVal);
     return false;
   });
+  $('#sumListLink').click(function() {
+    $.get("example-code/sum-list.txt", setCodeMirrorVal);
+    return false;
+  });
 
   $('#varargsLink').click(function() {
     $.get("example-code/varargs.txt", setCodeMirrorVal);
diff --git a/v3/tutor.html b/v3/tutor.html
index f7e5d9298..2f6a96820 100644
--- a/v3/tutor.html
+++ b/v3/tutor.html
@@ -128,7 +128,8 @@
 
 
Linked Lists:

 LL 1 |
-LL 2
+LL 2 |
+sum list
 

 
 
Pointer Aliasing:


From deaa7d1ab05ea058725ace2d76f6927e8105b3f6 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 6 Sep 2012 15:55:01 -0700
Subject: [PATCH 246/502] cleaned up some details of double-arrow
 implementation

---
 v3/js/pytutor.js | 52 ++++++++++++++++++------------------------------
 1 file changed, 19 insertions(+), 33 deletions(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index b16b6c08c..1e9f3a590 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -784,51 +784,39 @@ ExecutionVisualizer.prototype.updateOutput = function() {
     /* if instrLimitReached, then treat like a normal non-terminating line */
     var isTerminated = (!myViz.instrLimitReached && isLastInstr);
 
-    // rules for highlighting lines:
-    // 1.) If there's an error, then highlight current line
-    // 2.) If the program has terminated, then highlight current line
-    // 3.) Otherwise highlight the previously-executed line
-    //     (or the previous-previous line for most 'return' events)
-    var highlightColor = highlightedLineLighterColor;
-    var highlightLineNumber = null;
+
+    var curLineNumber = null;
+    var prevLineNumber = null;
 
     if (myViz.curInstr > 0) {
-      highlightLineNumber = myViz.curTrace[myViz.curInstr - 1].line;
+      prevLineNumber = myViz.curTrace[myViz.curInstr - 1].line;
       // special-case for most 'return' events to prevent highlighting
       // and arrow on the same line ...
       if ((curEntry.event == 'return') && 
-          (highlightLineNumber == curEntry.line) &&
+          (prevLineNumber == curEntry.line) &&
           (myViz.curInstr > 1)) {
-        highlightLineNumber = myViz.curTrace[myViz.curInstr - 2].line;
+        prevLineNumber = myViz.curTrace[myViz.curInstr - 2].line;
       }
     }
-    else {
-      highlightLineNumber = null; // at first instruction, don't highlight
-                                  // anything (unless hasError or isTerminated)
-    }
-
-    if (hasError || isTerminated) {
-      highlightLineNumber = curEntry.line;
-    }
 
-    if (hasError) {
-      highlightColor = errorColor;
+    if (isTerminated) {
+      // must do this AFTER the assignment to prevLineNumber above (order matters!)
+      prevLineNumber = curEntry.line;
     }
-
-
-    var arrowLineNumber = null;
-    if (!isTerminated) {
-      arrowLineNumber = curEntry.line;
+    else {
+      curLineNumber = curEntry.line;
     }
 
 
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.gutter')
       .html(function (d) {
-      // arrow types: '\u21d2', '\u21f0', '\u2907'
-      if (d.lineNumber == arrowLineNumber) {
+        // arrow types: '\u21d2', '\u21f0', '\u2907'
+
+        // give curLineNumber priority over prevLineNumber ...
+        if (d.lineNumber == curLineNumber) {
           return darkArrowHTML;
         }
-        else if (d.lineNumber == highlightLineNumber) {
+        else if (d.lineNumber == prevLineNumber) {
           return lightArrowHTML;
         }
         else {
@@ -839,12 +827,11 @@ ExecutionVisualizer.prototype.updateOutput = function() {
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.lineNo')
       .attr('id', function(d) {return 'lineNo' + d.lineNumber;});
 
-    // optionally highlight previously-executed line ...
-    /*
+
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.cod')
       .style('background-color', function(d) {
-        if (d.lineNumber == highlightLineNumber) {
-          d.backgroundColor = highlightColor;
+        if (hasError && (d.lineNumber == curEntry.line)) {
+          d.backgroundColor = errorColor;
         }
         else {
           d.backgroundColor = null;
@@ -852,7 +839,6 @@ ExecutionVisualizer.prototype.updateOutput = function() {
 
         return d.backgroundColor;
       });
-    */
 
 
     // returns True iff lineNo is visible in pyCodeOutputDiv

From 2eb16a2e64cb319a410c9ab340d1f7a50f87b710 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 6 Sep 2012 22:17:32 -0700
Subject: [PATCH 247/502] minor tweaks and added arrow fades

---
 v3/css/pytutor.css |  8 ++------
 v3/js/pytutor.js   | 48 ++++++++++++++++++++++++++++++----------------
 2 files changed, 33 insertions(+), 23 deletions(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 760cd806a..ab924841a 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -100,15 +100,11 @@ div.ExecutionVisualizer table#pyCodeOutput td {
 div.ExecutionVisualizer table#pyCodeOutput .gutter {
   width: 1.2em;
   text-align: right;
-}
-
-div.ExecutionVisualizer .darkArrow {
-  color: #d03939; /* darkRed in ../js/pytutor.js */
   font-size: 16pt;
+  color: white; /* start white by default and then fade into color as needed */
 }
 
-div.ExecutionVisualizer .lightArrow {
-  color: #bbb;
+div.ExecutionVisualizer .arrow {
   font-size: 16pt;
 }
 
diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 1e9f3a590..0a26bb3b9 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -42,9 +42,6 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 */
 
-var darkArrowHTML = '\u21d2';
-var lightArrowHTML = '\u21d2';
-
 
 var curVisualizerID = 1; // global to uniquely identify each ExecutionVisualizer instance
 
@@ -72,7 +69,7 @@ function ExecutionVisualizer(domRootID, dat, params) {
   // because each one contains IDENTICAL state information as the
   // 'step_line' entry immediately following it. this filtering allows the
   // visualization to not show as much redundancy.
-  //this.curTrace = this.curTrace.filter(function(e) {return e.event != 'call';});
+  this.curTrace = this.curTrace.filter(function(e) {return e.event != 'call';});
 
   this.curInstr = 0;
 
@@ -199,8 +196,16 @@ ExecutionVisualizer.prototype.render = function() {
     \
   ');
 
-  this.domRoot.find('#legendDiv')
-    .append(lightArrowHTML + ' line that has just executed
' + darkArrowHTML + ' next line to be executed
')
+
+  this.domRoot
+    .find('#legendDiv')
+      .append(arrowHTML + ' line that has just executed')
+      .find('.arrow:last')
+        .css('color', lightArrowColor)
+        .end()
+      .append('
' + arrowHTML + ' next line to be executed
')
+      .find('.arrow:last')
+        .css('color', darkArrowColor);
 
 
   if (this.params.editCodeBaseURL) {
@@ -642,9 +647,14 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
         return 'cod';
       }
     })
+    .attr('id', function(d, i) {
+      if (i == 1) {
+        return 'lineNo' + d.lineNumber;
+      }
+    })
     .html(function(d, i) {
       if (i == 0) {
-        return '';
+        return '\u21d2';
       }
       else if (i == 1) {
         return d.lineNumber;
@@ -809,24 +819,21 @@ ExecutionVisualizer.prototype.updateOutput = function() {
 
 
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.gutter')
-      .html(function (d) {
-        // arrow types: '\u21d2', '\u21f0', '\u2907'
-
+      .transition()
+      .duration(300)
+      .style('color', function (d) {
         // give curLineNumber priority over prevLineNumber ...
         if (d.lineNumber == curLineNumber) {
-          return darkArrowHTML;
+          return darkArrowColor;
         }
         else if (d.lineNumber == prevLineNumber) {
-          return lightArrowHTML;
+          return lightArrowColor;
         }
         else {
-          return '';
+          return 'white';
         }
       });
 
-    myViz.domRootD3.selectAll('#pyCodeOutputDiv td.lineNo')
-      .attr('id', function(d) {return 'lineNo' + d.lineNumber;});
-
 
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.cod')
       .style('background-color', function(d) {
@@ -852,7 +859,7 @@ ExecutionVisualizer.prototype.updateOutput = function() {
       var H = codeOutputDiv.height();
 
       // add a few pixels of fudge factor on the bottom end due to bottom scrollbar
-      return (PO <= LO) && (LO < (PO + H - 25));
+      return (PO <= LO) && (LO < (PO + H - 30));
     }
 
 
@@ -1951,6 +1958,13 @@ var breakpointColor = darkRed;
 var hoverBreakpointColor = connectorBaseColor;
 
 
+// Unicode arrow types: '\u21d2', '\u21f0', '\u2907'
+var darkArrowColor = darkRed;
+var lightArrowColor = '#bbb';
+
+var arrowHTML = '\u21d2';
+
+
 function assert(cond) {
   if (!cond) {
     alert("Assertion Failure (see console log for backtrace)");

From 6ab8a57e79eb510961369640ce0b34275e238bd3 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 6 Sep 2012 23:32:35 -0700
Subject: [PATCH 248/502] render a special floating red arrow for 'return'
 instructions

---
 v3/css/pytutor.css        |  7 +++++
 v3/example-code/happy.txt | 12 ++++++++
 v3/js/opt-frontend.js     |  5 ++++
 v3/js/pytutor.js          | 59 ++++++++++++++++++++++++++-------------
 v3/tutor.html             |  1 +
 5 files changed, 65 insertions(+), 19 deletions(-)
 create mode 100644 v3/example-code/happy.txt

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index ab924841a..75f2408d1 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -108,6 +108,13 @@ div.ExecutionVisualizer .arrow {
   font-size: 16pt;
 }
 
+div.ExecutionVisualizer .arrowFloater {
+  width: 1.2em;
+  text-align: right;
+  font-size: 16pt;
+  position: absolute;
+}
+
 div.ExecutionVisualizer table#pyCodeOutput .lineNo {
   color: #aaa;
   padding: 0.2em;
diff --git a/v3/example-code/happy.txt b/v3/example-code/happy.txt
new file mode 100644
index 000000000..c2dd73280
--- /dev/null
+++ b/v3/example-code/happy.txt
@@ -0,0 +1,12 @@
+# From "Teaching with Python" by John Zelle
+def happy():
+    print("Happy Birthday to you!")
+
+def sing(P):
+    happy()
+    happy()
+    print("Happy Birthday dear " + P + "!")
+    happy()
+
+# main
+sing("Fred")
diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 717df4cd3..7171d347e 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -310,6 +310,11 @@ $(document).ready(function() {
     return false;
   });
 
+  $("#happyExampleLink").click(function() {
+    $.get("example-code/happy.txt", setCodeMirrorVal);
+    return false;
+  });
+
   $("#newtonExampleLink").click(function() {
     $.get("example-code/sqrt.txt", setCodeMirrorVal);
     return false;
diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 0a26bb3b9..a3af3cfe7 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -648,7 +648,10 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
       }
     })
     .attr('id', function(d, i) {
-      if (i == 1) {
+      if (i == 0) {
+        return 'gutterNo' + d.lineNumber;
+      }
+      else if (i == 1) {
         return 'lineNo' + d.lineNumber;
       }
     })
@@ -793,6 +796,11 @@ ExecutionVisualizer.prototype.updateOutput = function() {
   function highlightCodeLine() {
     /* if instrLimitReached, then treat like a normal non-terminating line */
     var isTerminated = (!myViz.instrLimitReached && isLastInstr);
+    var isReturn = (curEntry.event == 'return');
+
+    var pcod = myViz.domRoot.find('#pyCodeOutputDiv');
+    // reset first
+    pcod.find('.arrowFloater').remove();
 
 
     var curLineNumber = null;
@@ -800,13 +808,6 @@ ExecutionVisualizer.prototype.updateOutput = function() {
 
     if (myViz.curInstr > 0) {
       prevLineNumber = myViz.curTrace[myViz.curInstr - 1].line;
-      // special-case for most 'return' events to prevent highlighting
-      // and arrow on the same line ...
-      if ((curEntry.event == 'return') && 
-          (prevLineNumber == curEntry.line) &&
-          (myViz.curInstr > 1)) {
-        prevLineNumber = myViz.curTrace[myViz.curInstr - 2].line;
-      }
     }
 
     if (isTerminated) {
@@ -817,12 +818,15 @@ ExecutionVisualizer.prototype.updateOutput = function() {
       curLineNumber = curEntry.line;
     }
 
+    // special-case rendering of floating arrow for returns
+    if (isReturn) {
+      curLineNumber = null;
+    }
 
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.gutter')
       .transition()
       .duration(300)
       .style('color', function (d) {
-        // give curLineNumber priority over prevLineNumber ...
         if (d.lineNumber == curLineNumber) {
           return darkArrowColor;
         }
@@ -853,10 +857,9 @@ ExecutionVisualizer.prototype.updateOutput = function() {
       var lineNoTd = myViz.domRoot.find('#lineNo' + lineNo);
       var LO = lineNoTd.offset().top;
 
-      var codeOutputDiv = myViz.domRoot.find('#pyCodeOutputDiv');
-      var PO = codeOutputDiv.offset().top;
-      var ST = codeOutputDiv.scrollTop();
-      var H = codeOutputDiv.height();
+      var PO = pcod.offset().top;
+      var ST = pcod.scrollTop();
+      var H = pcod.height();
 
       // add a few pixels of fudge factor on the bottom end due to bottom scrollbar
       return (PO <= LO) && (LO < (PO + H - 30));
@@ -868,13 +871,12 @@ ExecutionVisualizer.prototype.updateOutput = function() {
       var lineNoTd = myViz.domRoot.find('#lineNo' + lineNo);
       var LO = lineNoTd.offset().top;
 
-      var codeOutputDiv = myViz.domRoot.find('#pyCodeOutputDiv');
-      var PO = codeOutputDiv.offset().top;
-      var ST = codeOutputDiv.scrollTop();
-      var H = codeOutputDiv.height();
+      var PO = pcod.offset().top;
+      var ST = pcod.scrollTop();
+      var H = pcod.height();
 
-      codeOutputDiv.stop(); // first stop all previously-queued animations
-      codeOutputDiv.animate({scrollTop: (ST + (LO - PO - (Math.round(H / 2))))}, 300);
+      pcod.stop(); // first stop all previously-queued animations
+      pcod.animate({scrollTop: (ST + (LO - PO - (Math.round(H / 2))))}, 300);
     }
 
 
@@ -882,6 +884,25 @@ ExecutionVisualizer.prototype.updateOutput = function() {
     if (!isOutputLineVisible(curEntry.line)) {
       scrollCodeOutputToLine(curEntry.line);
     }
+
+
+    // do this AFTER scrolling is done, since we want the position to be final ...
+
+    // for a return instruction that's about to be executed,
+    // render a "floating" arrow a half-line down to signify
+    // pointing slightly below a line ...
+    if (isReturn && !isTerminated) {
+      // position() returns the position relative to its parent,
+      // which is HOPEFULLY pcod
+      var curLinePos = pcod.find('#gutterNo' + curEntry.line).position();
+      console.log(curLinePos.top, curLinePos.left);
+
+      pcod.append('
' + arrowHTML + '
');
+      pcod.find('.arrowFloater')
+        .css('color', darkArrowColor)
+        .offset({top: curLinePos.top + 5, left: curLinePos.left + 1, at: pcod});
+    }
+
   }
 
 
diff --git a/v3/tutor.html b/v3/tutor.html
index 2f6a96820..1a463b480 100644
--- a/v3/tutor.html
+++ b/v3/tutor.html
@@ -86,6 +86,7 @@
 
Basic Examples:

 
 hello |
+happy |
 intro |
 filter |
 tokenize |

From da68b051e20eaca57a01436970bf13784bcb1a9e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 6 Sep 2012 23:37:40 -0700
Subject: [PATCH 249/502] minor

---
 v3/js/pytutor.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index a3af3cfe7..f89c759db 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -900,7 +900,7 @@ ExecutionVisualizer.prototype.updateOutput = function() {
       pcod.append('
' + arrowHTML + '
');
       pcod.find('.arrowFloater')
         .css('color', darkArrowColor)
-        .offset({top: curLinePos.top + 5, left: curLinePos.left + 1, at: pcod});
+        .offset({top: curLinePos.top + 4, left: curLinePos.left + 1, at: pcod});
     }
 
   }

From 35fbdbbf36a821d318b8467aa95aee7c6e7e66c8 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 7 Sep 2012 00:30:10 -0700
Subject: [PATCH 250/502] a simpler and more robust red bar for returning from
 functions (still not perfect yet, though)

---
 v3/js/pytutor.js | 28 +++++++++-------------------
 1 file changed, 9 insertions(+), 19 deletions(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index f89c759db..a5383aee1 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -838,6 +838,15 @@ ExecutionVisualizer.prototype.updateOutput = function() {
         }
       });
 
+    myViz.domRootD3.selectAll('#pyCodeOutputDiv td.lineNo')
+      .style('border-bottom', function(d) {
+        if (isReturn && (d.lineNumber == curEntry.line)) {
+          return '2px solid ' + darkArrowColor;
+        }
+        else {
+          return '';
+        }
+      });
 
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.cod')
       .style('background-color', function(d) {
@@ -884,25 +893,6 @@ ExecutionVisualizer.prototype.updateOutput = function() {
     if (!isOutputLineVisible(curEntry.line)) {
       scrollCodeOutputToLine(curEntry.line);
     }
-
-
-    // do this AFTER scrolling is done, since we want the position to be final ...
-
-    // for a return instruction that's about to be executed,
-    // render a "floating" arrow a half-line down to signify
-    // pointing slightly below a line ...
-    if (isReturn && !isTerminated) {
-      // position() returns the position relative to its parent,
-      // which is HOPEFULLY pcod
-      var curLinePos = pcod.find('#gutterNo' + curEntry.line).position();
-      console.log(curLinePos.top, curLinePos.left);
-
-      pcod.append('
' + arrowHTML + '
');
-      pcod.find('.arrowFloater')
-        .css('color', darkArrowColor)
-        .offset({top: curLinePos.top + 4, left: curLinePos.left + 1, at: pcod});
-    }
-
   }
 
 

From d885230740734154fdbf716d095be7b4a8a1b05e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 7 Sep 2012 18:22:21 -0700
Subject: [PATCH 251/502] got first version of svg-based double-arrows working
 :)

---
 v3/css/pytutor.css |  14 +----
 v3/js/pytutor.js   | 131 +++++++++++++++++++++++++++++----------------
 2 files changed, 87 insertions(+), 58 deletions(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 75f2408d1..49c055048 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -97,24 +97,14 @@ div.ExecutionVisualizer table#pyCodeOutput td {
   white-space: nowrap;
 }
 
-div.ExecutionVisualizer table#pyCodeOutput .gutter {
-  width: 1.2em;
-  text-align: right;
-  font-size: 16pt;
-  color: white; /* start white by default and then fade into color as needed */
+div.ExecutionVisualizer #leftCodeGutterSVG {
+  width: 18px;
 }
 
 div.ExecutionVisualizer .arrow {
   font-size: 16pt;
 }
 
-div.ExecutionVisualizer .arrowFloater {
-  width: 1.2em;
-  text-align: right;
-  font-size: 16pt;
-  position: absolute;
-}
-
 div.ExecutionVisualizer table#pyCodeOutput .lineNo {
   color: #aaa;
   padding: 0.2em;
diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index a5383aee1..4e4b9d4a5 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -43,6 +43,18 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
 
+/* Coding gotchas:
+
+- NEVER use naked $(__) or d3.select(__) statements to select DOM elements.
+
+  ALWAYS use myViz.domRoot or myViz.domRootD3 for jQuery and D3, respectively.
+ 
+  Otherwise things will break in weird ways when you have more than one visualization
+  embedded within a webpage, due to multiple matches in the global namespace.
+
+*/
+
+
 var curVisualizerID = 1; // global to uniquely identify each ExecutionVisualizer instance
 
 // domRootID is the string ID of the root element where to render this instance
@@ -104,6 +116,8 @@ function ExecutionVisualizer(domRootID, dat, params) {
   var instrLimitReached = false;
 
 
+  // the root elements for jQuery and D3 selections, respectively.
+  // ALWAYS use these and never use naked $(__) or d3.select(__)
   this.domRoot = $('#' + domRootID);
   this.domRootD3 = d3.select('#' + domRootID);
 
@@ -338,7 +352,7 @@ ExecutionVisualizer.prototype.render = function() {
   this.updateOutput();
 
   this.hasRendered = true;
-};
+}
 
 
 // find the previous/next breakpoint to c or return -1 if it doesn't exist
@@ -634,13 +648,10 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
     .data(this.codeOutputLines)
     .enter().append('tr')
     .selectAll('td')
-    .data(function(d, i){return [d, d, d] /* map full data item down all three columns */;})
+    .data(function(d, i){return [d, d] /* map full data item down both columns */;})
     .enter().append('td')
     .attr('class', function(d, i) {
       if (i == 0) {
-        return 'gutter';
-      }
-      else if (i == 1) {
         return 'lineNo';
       }
       else {
@@ -649,17 +660,11 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
     })
     .attr('id', function(d, i) {
       if (i == 0) {
-        return 'gutterNo' + d.lineNumber;
-      }
-      else if (i == 1) {
         return 'lineNo' + d.lineNumber;
       }
     })
     .html(function(d, i) {
       if (i == 0) {
-        return '\u21d2';
-      }
-      else if (i == 1) {
         return d.lineNumber;
       }
       else {
@@ -667,6 +672,24 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
       }
     });
 
+  // create a left-most gutter td that spans ALL rows ...
+  myViz.domRoot.find('#pyCodeOutput tr:first')
+    .prepend('');
+
+  // create prevLineArrow and curLineArrow, but don't fill them in with colors just yet ...
+  myViz.domRootD3.select('svg#leftCodeGutterSVG')
+    .append('polygon')
+    .attr('id', 'prevLineArrow')
+    .attr('points', '0,3 12,3 12,0 18,5 12,10 12,7 0,7')
+    .attr('fill', 'white');
+
+  myViz.domRootD3.select('svg#leftCodeGutterSVG')
+    .append('polygon')
+    .attr('id', 'curLineArrow')
+    .attr('points', '0,3 12,3 12,0 18,5 12,10 12,7 0,7')
+    .attr('fill', 'white');
+
+
   // 2012-09-05: Disable breakpoints for now to simplify UX
   /*
   if (!this.params.embeddedMode) {
@@ -719,6 +742,18 @@ ExecutionVisualizer.prototype.updateOutput = function() {
   assert(this.curTrace);
 
 
+  // set the gutter's height to match that of its parent
+  // (we often can't do this earlier since the entire pane
+  //  might be invisible and hence return a height of zero)
+  var gutterSVG = myViz.domRoot.find('svg#leftCodeGutterSVG');
+  if (!gutterSVG.height()) {
+    gutterSVG.height(gutterSVG.parent().height());
+  }
+
+  var tableTop = 6; // manually adjust this so that it looks good :)
+  var rowHeight = myViz.domRoot.find('table#pyCodeOutput tr').first().height();
+
+
   // call the callback if necessary (BEFORE rendering)
   if (this.params.updateOutputCallback) {
     this.params.updateOutputCallback(this);
@@ -796,57 +831,61 @@ ExecutionVisualizer.prototype.updateOutput = function() {
   function highlightCodeLine() {
     /* if instrLimitReached, then treat like a normal non-terminating line */
     var isTerminated = (!myViz.instrLimitReached && isLastInstr);
-    var isReturn = (curEntry.event == 'return');
 
     var pcod = myViz.domRoot.find('#pyCodeOutputDiv');
-    // reset first
-    pcod.find('.arrowFloater').remove();
-
 
     var curLineNumber = null;
     var prevLineNumber = null;
 
+    var curIsReturn = (curEntry.event == 'return');
+    var prevIsReturn = false;
+
+
     if (myViz.curInstr > 0) {
       prevLineNumber = myViz.curTrace[myViz.curInstr - 1].line;
+      prevIsReturn = (myViz.curTrace[myViz.curInstr - 1].event == 'return');
     }
 
+    curLineNumber = curEntry.line;
+
+    // on 'return' events, give a bit more of a vertical nudge to show that
+    // the arrow is aligned with the 'bottom' of the line ...
+    var prevVerticalNudge = prevIsReturn ? 10 : 0;
+    var curVerticalNudge = curIsReturn ? 10 : 0;
+
+
+    // edge case for the final instruction :0
     if (isTerminated) {
-      // must do this AFTER the assignment to prevLineNumber above (order matters!)
-      prevLineNumber = curEntry.line;
+      // don't show redundant arrows on the same line when terminated ...
+      if (prevLineNumber == curLineNumber) {
+        curLineNumber = null;
+      }
+      // otherwise have a smaller vertical nudge (to fit at bottom of display table)
+      else {
+        curVerticalNudge = 8;
+      }
+    }
+
+    if (prevLineNumber) {
+      gutterSVG.find('#prevLineArrow')
+        .show()
+        .attr('fill', lightArrowColor)
+        .attr('transform', 'translate(0, ' + (((prevLineNumber - 1) * rowHeight) + tableTop + prevVerticalNudge) + ')');
     }
     else {
-      curLineNumber = curEntry.line;
+      gutterSVG.find('#prevLineArrow').hide();
     }
 
-    // special-case rendering of floating arrow for returns
-    if (isReturn) {
-      curLineNumber = null;
+    if (curLineNumber) {
+      gutterSVG.find('#curLineArrow')
+        .show()
+        .attr('fill', darkArrowColor)
+        .attr('transform', 'translate(0, ' + (((curLineNumber - 1) * rowHeight) + tableTop + curVerticalNudge) + ')');
+    }
+    else {
+      gutterSVG.find('#curLineArrow').hide();
     }
 
-    myViz.domRootD3.selectAll('#pyCodeOutputDiv td.gutter')
-      .transition()
-      .duration(300)
-      .style('color', function (d) {
-        if (d.lineNumber == curLineNumber) {
-          return darkArrowColor;
-        }
-        else if (d.lineNumber == prevLineNumber) {
-          return lightArrowColor;
-        }
-        else {
-          return 'white';
-        }
-      });
-
-    myViz.domRootD3.selectAll('#pyCodeOutputDiv td.lineNo')
-      .style('border-bottom', function(d) {
-        if (isReturn && (d.lineNumber == curEntry.line)) {
-          return '2px solid ' + darkArrowColor;
-        }
-        else {
-          return '';
-        }
-      });
 
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.cod')
       .style('background-color', function(d) {
@@ -1971,7 +2010,7 @@ var hoverBreakpointColor = connectorBaseColor;
 
 // Unicode arrow types: '\u21d2', '\u21f0', '\u2907'
 var darkArrowColor = darkRed;
-var lightArrowColor = '#bbb';
+var lightArrowColor = '#ccc';
 
 var arrowHTML = '\u21d2';
 

From 697f8d397a15792c983917216d7e97bf60792948 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 7 Sep 2012 18:25:34 -0700
Subject: [PATCH 252/502] ugh IE!!!

---
 v3/js/pytutor.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 4e4b9d4a5..3685abdaf 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -673,8 +673,9 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
     });
 
   // create a left-most gutter td that spans ALL rows ...
+  // (NB: valign="top" is CRUCIAL for this to work in IE)
   myViz.domRoot.find('#pyCodeOutput tr:first')
-    .prepend('');
+    .prepend('');
 
   // create prevLineArrow and curLineArrow, but don't fill them in with colors just yet ...
   myViz.domRootD3.select('svg#leftCodeGutterSVG')

From c3b02d59448e48503575441f15a412ba98ae79c0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 7 Sep 2012 18:50:33 -0700
Subject: [PATCH 253/502] H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer
 *!^#(J@#LJSDFh H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh
 H#*(U@#NWF:^@#:ORWOFH:!OPR3 Internet Explorer *!^#(J@#LJSDFh

---
 v3/js/pytutor.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 3685abdaf..c33354600 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -752,8 +752,14 @@ ExecutionVisualizer.prototype.updateOutput = function() {
   }
 
   var tableTop = 6; // manually adjust this so that it looks good :)
-  var rowHeight = myViz.domRoot.find('table#pyCodeOutput tr').first().height();
 
+  // this weird contortion is necessary to get the accurate row height on Internet Explorer
+  // (simpler methods work on all other major browsers, erghhhhhh!!!)
+  var rowHeight = 0;
+  if (this.codeOutputLines && this.codeOutputLines.length > 1) {
+    rowHeight = (myViz.domRoot.find('table#pyCodeOutput tr:nth-child(2)').offset().top - 
+                 myViz.domRoot.find('table#pyCodeOutput tr:first').offset().top);
+  }
 
   // call the callback if necessary (BEFORE rendering)
   if (this.params.updateOutputCallback) {

From 62916436ec2b67d1804f841fd8639ffb918dec2e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 7 Sep 2012 18:56:10 -0700
Subject: [PATCH 254/502] sorry imran ... after almost three years, your
 suggestion gets canned

---
 v3/js/pytutor.js | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index c33354600..6f53da1a2 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -304,12 +304,6 @@ ExecutionVisualizer.prototype.render = function() {
     myViz.domRoot.find("#errorOutput").html(htmlspecialchars(warningMsg));
     myViz.domRoot.find("#errorOutput").show();
   }
-  // as imran suggests, for a (non-error) one-liner, SNIP off the
-  // first instruction so that we start after the FIRST instruction
-  // has been executed ...
-  else if (this.curTrace.length == 2) {
-    this.curTrace.shift();
-  }
 
   // set up slider after postprocessing curTrace
 

From c4643674b33a0e33ed6ea1cf05be9df776180fa2 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 7 Sep 2012 19:16:40 -0700
Subject: [PATCH 255/502] more grossly hacks for IE

---
 v3/css/pytutor.css | 2 ++
 v3/js/pytutor.js   | 9 ++++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 49c055048..0442d261e 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -99,6 +99,8 @@ div.ExecutionVisualizer table#pyCodeOutput td {
 
 div.ExecutionVisualizer #leftCodeGutterSVG {
   width: 18px;
+  height: 0px; /* programmatically set this later ... IE needs this to
+                  be 0 or it defaults to something arbitrary and gross */
 }
 
 div.ExecutionVisualizer .arrow {
diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 6f53da1a2..c5569b552 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -736,6 +736,10 @@ ExecutionVisualizer.prototype.updateOutput = function() {
 
   assert(this.curTrace);
 
+  // there's no point in re-rendering if this pane isn't even visible in the first place!
+  if (!myViz.domRoot.is(':visible')) {
+    return;
+  }
 
   // set the gutter's height to match that of its parent
   // (we often can't do this earlier since the entire pane
@@ -749,7 +753,10 @@ ExecutionVisualizer.prototype.updateOutput = function() {
 
   // this weird contortion is necessary to get the accurate row height on Internet Explorer
   // (simpler methods work on all other major browsers, erghhhhhh!!!)
-  var rowHeight = 0;
+  
+  // first take care of edge case when there's only one line ...
+  var rowHeight = myViz.domRoot.find('table#pyCodeOutput td.cod:first').height();
+  // ... then handle the (much more common) multi-line case ...
   if (this.codeOutputLines && this.codeOutputLines.length > 1) {
     rowHeight = (myViz.domRoot.find('table#pyCodeOutput tr:nth-child(2)').offset().top - 
                  myViz.domRoot.find('table#pyCodeOutput tr:first').offset().top);

From 4bd4730cc4e482655259335e58a00264c956ed10 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 7 Sep 2012 19:20:42 -0700
Subject: [PATCH 256/502] teeny

---
 v3/css/pytutor.css | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 0442d261e..8c82432ff 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -159,8 +159,8 @@ div.ExecutionVisualizer #vcrControls {
 }
 
 div.ExecutionVisualizer #vcrControls button {
-  margin-left: 5px;
-  margin-right: 5px;
+  margin-left: 4px;
+  margin-right: 4px;
 }
 
 div.ExecutionVisualizer #pyStdout {

From c98dcf66f0c8334f5014ec15e302ff23575e3d34 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 7 Sep 2012 19:21:49 -0700
Subject: [PATCH 257/502] teeny2

---
 v3/css/pytutor.css | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 8c82432ff..5ad55713f 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -159,8 +159,8 @@ div.ExecutionVisualizer #vcrControls {
 }
 
 div.ExecutionVisualizer #vcrControls button {
-  margin-left: 4px;
-  margin-right: 4px;
+  margin-left: 3px;
+  margin-right: 3px;
 }
 
 div.ExecutionVisualizer #pyStdout {

From ca150f4c2ae436b16abc4305d092dd53ef3e8c2b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 7 Sep 2012 19:32:06 -0700
Subject: [PATCH 258/502] some cleanups

---
 v3/css/pytutor.css |  9 +++++++++
 v3/js/pytutor.js   | 28 +++++++++++++++++-----------
 2 files changed, 26 insertions(+), 11 deletions(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 5ad55713f..61f81f9e0 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -103,6 +103,12 @@ div.ExecutionVisualizer #leftCodeGutterSVG {
                   be 0 or it defaults to something arbitrary and gross */
 }
 
+div.ExecutionVisualizer #prevLegendArrowSVG,
+div.ExecutionVisualizer #curLegendArrowSVG {
+  width: 18px;
+  height: 10px;
+}
+
 div.ExecutionVisualizer .arrow {
   font-size: 16pt;
 }
@@ -124,8 +130,11 @@ div.ExecutionVisualizer table#pyCodeOutput .cod {
 
 div.ExecutionVisualizer div#legendDiv {
   margin: 0px;
+  margin-top: 10px;
+  margin-bottom: 5px;
   padding: 0px;
   text-align: left;
+  color: #888;
 }
 
 div.ExecutionVisualizer div#editCodeLinkDiv {
diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index c5569b552..d48b2a016 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -55,6 +55,8 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
 
+var svgArrowPolygon = '0,3 12,3 12,0 18,5 12,10 12,7 0,7';
+
 var curVisualizerID = 1; // global to uniquely identify each ExecutionVisualizer instance
 
 // domRootID is the string ID of the root element where to render this instance
@@ -211,15 +213,19 @@ ExecutionVisualizer.prototype.render = function() {
   ');
 
 
-  this.domRoot
-    .find('#legendDiv')
-      .append(arrowHTML + ' line that has just executed')
-      .find('.arrow:last')
-        .css('color', lightArrowColor)
-        .end()
-      .append('
' + arrowHTML + ' next line to be executed
')
-      .find('.arrow:last')
-        .css('color', darkArrowColor);
+  this.domRoot.find('#legendDiv')
+    .append(' line that has just executed')
+    .append('
 next line to be executed
');
+
+  myViz.domRootD3.select('svg#prevLegendArrowSVG')
+    .append('polygon')
+    .attr('points', svgArrowPolygon)
+    .attr('fill', lightArrowColor);
+
+  myViz.domRootD3.select('svg#curLegendArrowSVG')
+    .append('polygon')
+    .attr('points', svgArrowPolygon)
+    .attr('fill', darkArrowColor);
 
 
   if (this.params.editCodeBaseURL) {
@@ -675,13 +681,13 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
   myViz.domRootD3.select('svg#leftCodeGutterSVG')
     .append('polygon')
     .attr('id', 'prevLineArrow')
-    .attr('points', '0,3 12,3 12,0 18,5 12,10 12,7 0,7')
+    .attr('points', svgArrowPolygon)
     .attr('fill', 'white');
 
   myViz.domRootD3.select('svg#leftCodeGutterSVG')
     .append('polygon')
     .attr('id', 'curLineArrow')
-    .attr('points', '0,3 12,3 12,0 18,5 12,10 12,7 0,7')
+    .attr('points', svgArrowPolygon)
     .attr('fill', 'white');
 
 

From 8cc383f03c20207112b585a825f2bb1769f4c85a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 7 Sep 2012 19:35:48 -0700
Subject: [PATCH 259/502] teeny3

---
 v3/css/pytutor.css | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 61f81f9e0..07fa354d6 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -129,12 +129,12 @@ div.ExecutionVisualizer table#pyCodeOutput .cod {
 }
 
 div.ExecutionVisualizer div#legendDiv {
-  margin: 0px;
-  margin-top: 10px;
-  margin-bottom: 5px;
+  margin-top: 25px;
+  margin-bottom: 20px;
   padding: 0px;
   text-align: left;
-  color: #888;
+  color: #666;
+  font-size: 9pt;
 }
 
 div.ExecutionVisualizer div#editCodeLinkDiv {

From 223594c517d43ea64ef5393827b4928a774773a3 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 7 Sep 2012 19:38:45 -0700
Subject: [PATCH 260/502] teeny4

---
 v3/css/pytutor.css | 3 +--
 v3/js/pytutor.js   | 2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 07fa354d6..c70bbd2ea 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -129,8 +129,7 @@ div.ExecutionVisualizer table#pyCodeOutput .cod {
 }
 
 div.ExecutionVisualizer div#legendDiv {
-  margin-top: 25px;
-  margin-bottom: 20px;
+  margin-top: 20px;
   padding: 0px;
   text-align: left;
   color: #666;
diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index d48b2a016..6089bf60d 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -215,7 +215,7 @@ ExecutionVisualizer.prototype.render = function() {
 
   this.domRoot.find('#legendDiv')
     .append(' line that has just executed')
-    .append('
 next line to be executed
');
+    .append('
 next line to be executed
');
 
   myViz.domRootD3.select('svg#prevLegendArrowSVG')
     .append('polygon')

From 048c69a8998cae33de389f369f98b20d14b7a690 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 7 Sep 2012 19:44:38 -0700
Subject: [PATCH 261/502] bah

---
 v3/js/pytutor.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 6089bf60d..b5f8e36ec 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -215,7 +215,7 @@ ExecutionVisualizer.prototype.render = function() {
 
   this.domRoot.find('#legendDiv')
     .append(' line that has just executed')
-    .append('
 next line to be executed
');
+    .append('
 next line to execute
');
 
   myViz.domRootD3.select('svg#prevLegendArrowSVG')
     .append('polygon')

From 2e158d963e975f4d3389ef7f5b3838ef9dda9ef4 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 9 Sep 2012 11:17:08 -0700
Subject: [PATCH 262/502] keep return values around for zombie frames but NOT
 for subsequent generator calls

---
 v3/pg_logger.py | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/v3/pg_logger.py b/v3/pg_logger.py
index 2b3688fc1..0e470f1d6 100644
--- a/v3/pg_logger.py
+++ b/v3/pg_logger.py
@@ -239,6 +239,14 @@ def user_call(self, frame, argument_list):
         if self._wait_for_mainpyfile:
             return
         if self.stop_here(frame):
+            # delete __return__ so that on subsequent calls to
+            # a generator function, the OLD yielded (returned)
+            # value gets deleted from the frame ...
+            try:
+              del frame.f_locals['__return__']
+            except KeyError:
+              pass
+
             self.interaction(frame, None, 'call')
 
     def user_line(self, frame):
@@ -254,12 +262,6 @@ def user_return(self, frame, return_value):
         """This function is called when a return trap is set here."""
         frame.f_locals['__return__'] = return_value
         self.interaction(frame, None, 'return')
-        # delete __return__ so that on subsequent calls to
-        # a generator function, the OLD yielded (returned)
-        # value gets deleted from the frame ...
-        # (this also clears away crufty obsolete return values in other
-        # kinds of examples as well, most notably those involving closures)
-        del frame.f_locals['__return__']
 
     def user_exception(self, frame, exc_info):
         exc_type, exc_value, exc_traceback = exc_info

From 68767c0a1e5fc8857e43d9756d3304aaf66a3395 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 9 Sep 2012 12:48:57 -0700
Subject: [PATCH 263/502] update tests to reflect keeping return values for
 closure zombie frames

---
 v3/example-code/closures/closure1.golden     |   35 +-
 v3/example-code/closures/closure2.golden     |  161 +-
 v3/example-code/closures/closure3.golden     |   77 +-
 v3/example-code/closures/closure4.golden     |  147 +-
 v3/example-code/closures/closure5.golden     |  651 +++-
 v3/example-code/closures/lambda-param.golden |    4 +-
 v3/example-code/decorators.golden            |  175 +-
 v3/example-code/genexpr.golden               |  114 +-
 v3/example-code/happy.golden                 |  952 +++++
 v3/example-code/linked-lists/ll2.golden      |  829 ++++-
 v3/example-code/map.golden                   |    7 +-
 v3/example-code/oop_1.golden                 |  595 ++-
 v3/example-code/oop_2.golden                 |  504 ++-
 v3/example-code/oop_inherit.golden           |  820 ++++-
 v3/example-code/oop_small.golden             |  351 +-
 v3/example-code/sqrt.golden                  |   20 +-
 v3/example-code/sum-list.golden              | 3466 ++++++++++++++++++
 v3/example-code/sum.golden                   |    4 +-
 v3/tests/backend-tests/class_test.golden     |  532 ++-
 v3/tests/backend-tests/john-compose.golden   |   77 +-
 v3/tests/backend-tests/lambda_1.golden       |    4 +-
 v3/tests/backend-tests/ling-scheme-2.golden  |    7 +-
 v3/tests/backend-tests/ling-scheme-3.golden  |    7 +-
 v3/tests/backend-tests/newstyle_class.golden |  308 +-
 24 files changed, 9356 insertions(+), 491 deletions(-)
 create mode 100644 v3/example-code/happy.golden
 create mode 100644 v3/example-code/sum-list.golden

diff --git a/v3/example-code/closures/closure1.golden b/v3/example-code/closures/closure1.golden
index 72c708a07..60defd48b 100644
--- a/v3/example-code/closures/closure1.golden
+++ b/v3/example-code/closures/closure1.golden
@@ -227,6 +227,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "bar": [
               "REF", 
               2
@@ -240,7 +244,8 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }
       ], 
@@ -281,6 +286,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "bar": [
               "REF", 
               2
@@ -294,7 +303,8 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
@@ -352,6 +362,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "bar": [
               "REF", 
               2
@@ -365,7 +379,8 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
@@ -423,6 +438,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "bar": [
               "REF", 
               2
@@ -436,7 +455,8 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
@@ -496,6 +516,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "bar": [
               "REF", 
               2
@@ -509,7 +533,8 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }
       ], 
diff --git a/v3/example-code/closures/closure2.golden b/v3/example-code/closures/closure2.golden
index 37b206be9..57084967a 100644
--- a/v3/example-code/closures/closure2.golden
+++ b/v3/example-code/closures/closure2.golden
@@ -301,6 +301,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "bar": [
               "REF", 
               3
@@ -314,7 +318,8 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }
       ], 
@@ -365,6 +370,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "bar": [
               "REF", 
               3
@@ -378,7 +387,8 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
@@ -444,6 +454,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "bar": [
               "REF", 
               3
@@ -457,7 +471,8 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
@@ -523,6 +538,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "bar": [
               "REF", 
               3
@@ -536,7 +555,8 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
@@ -612,6 +632,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "bar": [
               "REF", 
               3
@@ -625,7 +649,8 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
@@ -707,6 +732,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "bar": [
               "REF", 
               3
@@ -720,13 +749,18 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "bar_deux": [
               "REF", 
               4
@@ -740,7 +774,8 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux"
+            "bar_deux", 
+            "__return__"
           ]
         }
       ], 
@@ -801,6 +836,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "bar": [
               "REF", 
               3
@@ -814,13 +853,18 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "bar_deux": [
               "REF", 
               4
@@ -834,7 +878,8 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux"
+            "bar_deux", 
+            "__return__"
           ]
         }, 
         {
@@ -912,6 +957,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "bar": [
               "REF", 
               3
@@ -925,13 +974,18 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "bar_deux": [
               "REF", 
               4
@@ -945,7 +999,8 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux"
+            "bar_deux", 
+            "__return__"
           ]
         }, 
         {
@@ -1023,6 +1078,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "bar": [
               "REF", 
               3
@@ -1036,13 +1095,18 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "bar_deux": [
               "REF", 
               4
@@ -1056,7 +1120,8 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux"
+            "bar_deux", 
+            "__return__"
           ]
         }, 
         {
@@ -1136,6 +1201,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "bar": [
               "REF", 
               3
@@ -1149,13 +1218,18 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "bar_deux": [
               "REF", 
               4
@@ -1169,7 +1243,8 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux"
+            "bar_deux", 
+            "__return__"
           ]
         }
       ], 
@@ -1230,6 +1305,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "bar": [
               "REF", 
               3
@@ -1243,13 +1322,18 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "bar_deux": [
               "REF", 
               4
@@ -1263,7 +1347,8 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux"
+            "bar_deux", 
+            "__return__"
           ]
         }, 
         {
@@ -1341,6 +1426,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "bar": [
               "REF", 
               3
@@ -1354,13 +1443,18 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "bar_deux": [
               "REF", 
               4
@@ -1374,7 +1468,8 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux"
+            "bar_deux", 
+            "__return__"
           ]
         }, 
         {
@@ -1452,6 +1547,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "bar": [
               "REF", 
               3
@@ -1465,13 +1564,18 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "bar_deux": [
               "REF", 
               4
@@ -1485,7 +1589,8 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux"
+            "bar_deux", 
+            "__return__"
           ]
         }, 
         {
@@ -1565,6 +1670,10 @@
           "frame_id": 1, 
           "encoded_locals": {
             "y": 1, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "bar": [
               "REF", 
               3
@@ -1578,13 +1687,18 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "y": 1000, 
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "bar_deux": [
               "REF", 
               4
@@ -1598,7 +1712,8 @@
           "unique_hash": "foo_deux_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "bar_deux"
+            "bar_deux", 
+            "__return__"
           ]
         }
       ], 
diff --git a/v3/example-code/closures/closure3.golden b/v3/example-code/closures/closure3.golden
index 43b4b2ecb..7a968114d 100644
--- a/v3/example-code/closures/closure3.golden
+++ b/v3/example-code/closures/closure3.golden
@@ -665,6 +665,10 @@
               "REF", 
               4
             ], 
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "baz": [
               "REF", 
               5
@@ -680,7 +684,8 @@
           "unique_hash": "bar_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "baz"
+            "baz", 
+            "__return__"
           ]
         }
       ], 
@@ -739,6 +744,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": [
               "REF", 
               2
@@ -756,7 +765,8 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
@@ -766,6 +776,10 @@
               "REF", 
               4
             ], 
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "baz": [
               "REF", 
               5
@@ -781,7 +795,8 @@
           "unique_hash": "bar_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "baz"
+            "baz", 
+            "__return__"
           ]
         }
       ], 
@@ -844,6 +859,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": [
               "REF", 
               2
@@ -861,7 +880,8 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
@@ -871,6 +891,10 @@
               "REF", 
               4
             ], 
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "baz": [
               "REF", 
               5
@@ -886,7 +910,8 @@
           "unique_hash": "bar_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "baz"
+            "baz", 
+            "__return__"
           ]
         }, 
         {
@@ -978,6 +1003,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": [
               "REF", 
               2
@@ -995,7 +1024,8 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
@@ -1005,6 +1035,10 @@
               "REF", 
               4
             ], 
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "baz": [
               "REF", 
               5
@@ -1020,7 +1054,8 @@
           "unique_hash": "bar_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "baz"
+            "baz", 
+            "__return__"
           ]
         }, 
         {
@@ -1112,6 +1147,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": [
               "REF", 
               2
@@ -1129,7 +1168,8 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
@@ -1139,6 +1179,10 @@
               "REF", 
               4
             ], 
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "baz": [
               "REF", 
               5
@@ -1154,7 +1198,8 @@
           "unique_hash": "bar_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "baz"
+            "baz", 
+            "__return__"
           ]
         }, 
         {
@@ -1248,6 +1293,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": [
               "REF", 
               2
@@ -1265,7 +1314,8 @@
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "bar"
+            "bar", 
+            "__return__"
           ]
         }, 
         {
@@ -1275,6 +1325,10 @@
               "REF", 
               4
             ], 
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "baz": [
               "REF", 
               5
@@ -1290,7 +1344,8 @@
           "unique_hash": "bar_f2_p_z", 
           "ordered_varnames": [
             "y", 
-            "baz"
+            "baz", 
+            "__return__"
           ]
         }
       ], 
diff --git a/v3/example-code/closures/closure4.golden b/v3/example-code/closures/closure4.golden
index 3b39773ee..d26bb55af 100644
--- a/v3/example-code/closures/closure4.golden
+++ b/v3/example-code/closures/closure4.golden
@@ -226,6 +226,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -240,7 +244,8 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }
       ], 
@@ -280,6 +285,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -294,7 +303,8 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -349,6 +359,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -363,7 +377,8 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -418,6 +433,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -432,7 +451,8 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -497,6 +517,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -511,7 +535,8 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -582,6 +607,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -596,12 +625,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 2, 
             "g": [
               "REF", 
@@ -616,7 +650,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }
       ], 
@@ -666,6 +701,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -680,12 +719,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 2, 
             "g": [
               "REF", 
@@ -700,7 +744,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -767,6 +812,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -781,12 +830,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 2, 
             "g": [
               "REF", 
@@ -801,7 +855,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -868,6 +923,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -882,12 +941,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 2, 
             "g": [
               "REF", 
@@ -902,7 +966,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -971,6 +1036,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -985,12 +1054,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 2, 
             "g": [
               "REF", 
@@ -1005,7 +1079,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -1072,6 +1147,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -1086,12 +1165,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 2, 
             "g": [
               "REF", 
@@ -1106,7 +1190,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -1173,6 +1258,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -1187,12 +1276,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 2, 
             "g": [
               "REF", 
@@ -1207,7 +1301,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -1276,6 +1371,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": 1, 
             "g": [
               "REF", 
@@ -1290,12 +1389,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 2, 
             "g": [
               "REF", 
@@ -1310,7 +1414,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }
       ], 
diff --git a/v3/example-code/closures/closure5.golden b/v3/example-code/closures/closure5.golden
index 549e7897d..3251000b6 100644
--- a/v3/example-code/closures/closure5.golden
+++ b/v3/example-code/closures/closure5.golden
@@ -231,6 +231,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -245,7 +249,8 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }
       ], 
@@ -290,6 +295,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -304,7 +313,8 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -364,6 +374,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -378,7 +392,8 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -438,6 +453,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -452,7 +471,8 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -522,6 +542,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -536,7 +560,8 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -617,6 +642,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -631,12 +660,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -651,7 +685,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }
       ], 
@@ -711,6 +746,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -725,12 +764,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -745,7 +789,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -818,6 +863,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -832,12 +881,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -852,7 +906,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -925,6 +980,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -939,12 +998,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -959,7 +1023,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -1051,6 +1116,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -1065,12 +1134,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -1085,7 +1159,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -1177,6 +1252,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -1191,12 +1270,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -1211,7 +1295,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -1303,6 +1388,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -1317,12 +1406,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -1337,7 +1431,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -1448,6 +1543,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -1462,12 +1561,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -1482,7 +1586,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -1593,6 +1698,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -1607,12 +1716,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -1627,7 +1741,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -1738,6 +1853,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -1752,12 +1871,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -1772,7 +1896,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -1902,6 +2027,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -1916,12 +2045,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -1936,7 +2070,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -2066,6 +2201,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -2080,12 +2219,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -2100,7 +2244,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -2230,6 +2375,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -2244,12 +2393,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -2264,7 +2418,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -2413,6 +2568,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -2427,12 +2586,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -2447,7 +2611,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -2596,6 +2761,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -2610,12 +2779,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -2630,7 +2804,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -2779,6 +2954,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -2793,12 +2972,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -2813,7 +2997,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -2964,6 +3149,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -2978,12 +3167,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -2998,7 +3192,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -3130,6 +3325,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -3144,12 +3343,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -3164,7 +3368,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -3277,6 +3482,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -3291,12 +3500,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -3311,7 +3525,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -3405,6 +3620,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -3419,12 +3638,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -3439,7 +3663,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -3516,6 +3741,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -3530,12 +3759,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -3550,7 +3784,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -3623,6 +3858,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -3637,12 +3876,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -3657,7 +3901,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -3730,6 +3975,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -3744,12 +3993,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -3764,7 +4018,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -3856,6 +4111,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -3870,12 +4129,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -3890,7 +4154,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -3982,6 +4247,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -3996,12 +4265,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -4016,7 +4290,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -4108,6 +4383,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -4122,12 +4401,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -4142,7 +4426,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -4253,6 +4538,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -4267,12 +4556,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -4287,7 +4581,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -4398,6 +4693,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -4412,12 +4711,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -4432,7 +4736,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -4543,6 +4848,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -4557,12 +4866,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -4577,7 +4891,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -4707,6 +5022,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -4721,12 +5040,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -4741,7 +5065,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -4871,6 +5196,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -4885,12 +5214,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -4905,7 +5239,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -5035,6 +5370,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -5049,12 +5388,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -5069,7 +5413,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -5218,6 +5563,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -5232,12 +5581,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -5252,7 +5606,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -5401,6 +5756,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -5415,12 +5774,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -5435,7 +5799,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -5584,6 +5949,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -5598,12 +5967,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -5618,7 +5992,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -5786,6 +6161,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -5800,12 +6179,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -5820,7 +6204,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -5988,6 +6373,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -6002,12 +6391,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -6022,7 +6416,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -6190,6 +6585,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -6204,12 +6603,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -6224,7 +6628,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -6394,6 +6799,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -6408,12 +6817,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -6428,7 +6842,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -6579,6 +6994,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -6593,12 +7012,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -6613,7 +7037,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -6745,6 +7170,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -6759,12 +7188,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -6779,7 +7213,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -6892,6 +7327,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -6906,12 +7345,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -6926,7 +7370,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -7020,6 +7465,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -7034,12 +7483,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -7054,7 +7508,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -7132,6 +7587,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              3
+            ], 
             "x": 3, 
             "g": [
               "REF", 
@@ -7146,12 +7605,17 @@
           "unique_hash": "f_f1_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "x": 4, 
             "g": [
               "REF", 
@@ -7166,7 +7630,8 @@
           "unique_hash": "f_f2_p_z", 
           "ordered_varnames": [
             "x", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }
       ], 
diff --git a/v3/example-code/closures/lambda-param.golden b/v3/example-code/closures/lambda-param.golden
index 3bf4753ae..981686dd2 100644
--- a/v3/example-code/closures/lambda-param.golden
+++ b/v3/example-code/closures/lambda-param.golden
@@ -714,6 +714,7 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": null, 
             "x": 10
           }, 
           "is_highlighted": false, 
@@ -723,7 +724,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "foo_f1_p_z", 
           "ordered_varnames": [
-            "x"
+            "x", 
+            "__return__"
           ]
         }
       ], 
diff --git a/v3/example-code/decorators.golden b/v3/example-code/decorators.golden
index f2723f388..67355fc21 100644
--- a/v3/example-code/decorators.golden
+++ b/v3/example-code/decorators.golden
@@ -292,6 +292,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "fn": [
               "REF", 
               3
@@ -304,7 +308,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
@@ -372,6 +377,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "fn": [
               "REF", 
               3
@@ -384,7 +393,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
@@ -452,6 +462,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "fn": [
               "REF", 
               3
@@ -464,7 +478,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
@@ -543,6 +558,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "fn": [
               "REF", 
               3
@@ -555,12 +574,17 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "fn": [
               "REF", 
               4
@@ -573,7 +597,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }
       ], 
@@ -633,6 +658,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "fn": [
               "REF", 
               3
@@ -645,12 +674,17 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "fn": [
               "REF", 
               4
@@ -663,7 +697,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
@@ -736,6 +771,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "fn": [
               "REF", 
               3
@@ -748,12 +787,17 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "fn": [
               "REF", 
               4
@@ -766,7 +810,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
@@ -839,6 +884,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "fn": [
               "REF", 
               3
@@ -851,12 +900,17 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "fn": [
               "REF", 
               4
@@ -869,7 +923,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
@@ -955,6 +1010,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "fn": [
               "REF", 
               3
@@ -967,12 +1026,17 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "fn": [
               "REF", 
               4
@@ -985,7 +1049,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
@@ -1071,6 +1136,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "fn": [
               "REF", 
               3
@@ -1083,12 +1152,17 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "fn": [
               "REF", 
               4
@@ -1101,7 +1175,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
@@ -1198,6 +1273,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "fn": [
               "REF", 
               3
@@ -1210,12 +1289,17 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "fn": [
               "REF", 
               4
@@ -1228,7 +1312,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
@@ -1325,6 +1410,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "fn": [
               "REF", 
               3
@@ -1337,12 +1426,17 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "fn": [
               "REF", 
               4
@@ -1355,7 +1449,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
@@ -1456,6 +1551,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "fn": [
               "REF", 
               3
@@ -1468,12 +1567,17 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "fn": [
               "REF", 
               4
@@ -1486,7 +1590,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
@@ -1576,6 +1681,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "fn": [
               "REF", 
               3
@@ -1588,12 +1697,17 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "fn": [
               "REF", 
               4
@@ -1606,7 +1720,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
@@ -1684,6 +1799,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "fn": [
               "REF", 
               3
@@ -1696,12 +1815,17 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_italic_f1_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              5
+            ], 
             "fn": [
               "REF", 
               4
@@ -1714,7 +1838,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "make_bold_f2_p_z", 
           "ordered_varnames": [
-            "fn"
+            "fn", 
+            "__return__"
           ]
         }
       ], 
diff --git a/v3/example-code/genexpr.golden b/v3/example-code/genexpr.golden
index 85931e7a5..aebc24d6d 100644
--- a/v3/example-code/genexpr.golden
+++ b/v3/example-code/genexpr.golden
@@ -1,5 +1,5 @@
 {
-  "code": "x = (i for i in range(10))\n\nfor e in x:\n    print(e)\n", 
+  "code": "# NB: there's a known bug when frames of exited functions are displayed\nx = (i for i in range(10))\n\nfor e in x:\n    print(e)\n", 
   "trace": [
     {
       "ordered_globals": [], 
@@ -8,7 +8,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -30,7 +30,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 3, 
+      "line": 4, 
       "event": "step_line"
     }, 
     {
@@ -75,7 +75,7 @@
           ""
         ]
       }, 
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       "event": "call"
     }, 
     {
@@ -120,7 +120,7 @@
           ""
         ]
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-      "line": 1, 
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       "event": "step_line"
     }, 
     {
@@ -169,7 +169,7 @@
           ""
         ]
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-      "line": 1, 
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       "event": "return"
     }, 
     {
@@ -193,7 +193,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 4, 
+      "line": 5, 
       "event": "step_line"
     }, 
     {
@@ -217,7 +217,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 3, 
+      "line": 4, 
       "event": "step_line"
     }, 
     {
@@ -266,7 +266,7 @@
           ""
         ]
       }, 
-      "line": 1, 
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       "event": "call"
     }, 
     {
@@ -315,7 +315,7 @@
           ""
         ]
       }, 
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       "event": "step_line"
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     {
@@ -366,7 +366,7 @@
           ""
         ]
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       "event": "return"
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     {
@@ -390,7 +390,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 4, 
+      "line": 5, 
       "event": "step_line"
     }, 
     {
@@ -414,7 +414,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 3, 
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       "event": "step_line"
     }, 
     {
@@ -463,7 +463,7 @@
           ""
         ]
       }, 
-      "line": 1, 
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       "event": "call"
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     {
@@ -512,7 +512,7 @@
           ""
         ]
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       "event": "step_line"
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     {
@@ -563,7 +563,7 @@
           ""
         ]
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-      "line": 1, 
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       "event": "return"
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     {
@@ -587,7 +587,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 4, 
+      "line": 5, 
       "event": "step_line"
     }, 
     {
@@ -611,7 +611,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 3, 
+      "line": 4, 
       "event": "step_line"
     }, 
     {
@@ -660,7 +660,7 @@
           ""
         ]
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-      "line": 1, 
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       "event": "call"
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     {
@@ -709,7 +709,7 @@
           ""
         ]
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-      "line": 1, 
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       "event": "step_line"
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     {
@@ -760,7 +760,7 @@
           ""
         ]
       }, 
-      "line": 1, 
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       "event": "return"
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     {
@@ -784,7 +784,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 4, 
+      "line": 5, 
       "event": "step_line"
     }, 
     {
@@ -808,7 +808,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 3, 
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       "event": "step_line"
     }, 
     {
@@ -857,7 +857,7 @@
           ""
         ]
       }, 
-      "line": 1, 
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       "event": "call"
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     {
@@ -906,7 +906,7 @@
           ""
         ]
       }, 
-      "line": 1, 
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       "event": "step_line"
     }, 
     {
@@ -957,7 +957,7 @@
           ""
         ]
       }, 
-      "line": 1, 
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       "event": "return"
     }, 
     {
@@ -981,7 +981,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 4, 
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       "event": "step_line"
     }, 
     {
@@ -1005,7 +1005,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 3, 
+      "line": 4, 
       "event": "step_line"
     }, 
     {
@@ -1054,7 +1054,7 @@
           ""
         ]
       }, 
-      "line": 1, 
+      "line": 2, 
       "event": "call"
     }, 
     {
@@ -1103,7 +1103,7 @@
           ""
         ]
       }, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -1154,7 +1154,7 @@
           ""
         ]
       }, 
-      "line": 1, 
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       "event": "return"
     }, 
     {
@@ -1178,7 +1178,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 4, 
+      "line": 5, 
       "event": "step_line"
     }, 
     {
@@ -1202,7 +1202,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 3, 
+      "line": 4, 
       "event": "step_line"
     }, 
     {
@@ -1251,7 +1251,7 @@
           ""
         ]
       }, 
-      "line": 1, 
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       "event": "call"
     }, 
     {
@@ -1300,7 +1300,7 @@
           ""
         ]
       }, 
-      "line": 1, 
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       "event": "step_line"
     }, 
     {
@@ -1351,7 +1351,7 @@
           ""
         ]
       }, 
-      "line": 1, 
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       "event": "return"
     }, 
     {
@@ -1375,7 +1375,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 4, 
+      "line": 5, 
       "event": "step_line"
     }, 
     {
@@ -1399,7 +1399,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 3, 
+      "line": 4, 
       "event": "step_line"
     }, 
     {
@@ -1448,7 +1448,7 @@
           ""
         ]
       }, 
-      "line": 1, 
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       "event": "call"
     }, 
     {
@@ -1497,7 +1497,7 @@
           ""
         ]
       }, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -1548,7 +1548,7 @@
           ""
         ]
       }, 
-      "line": 1, 
+      "line": 2, 
       "event": "return"
     }, 
     {
@@ -1572,7 +1572,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 4, 
+      "line": 5, 
       "event": "step_line"
     }, 
     {
@@ -1596,7 +1596,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 3, 
+      "line": 4, 
       "event": "step_line"
     }, 
     {
@@ -1645,7 +1645,7 @@
           ""
         ]
       }, 
-      "line": 1, 
+      "line": 2, 
       "event": "call"
     }, 
     {
@@ -1694,7 +1694,7 @@
           ""
         ]
       }, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -1745,7 +1745,7 @@
           ""
         ]
       }, 
-      "line": 1, 
+      "line": 2, 
       "event": "return"
     }, 
     {
@@ -1769,7 +1769,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 4, 
+      "line": 5, 
       "event": "step_line"
     }, 
     {
@@ -1793,7 +1793,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 3, 
+      "line": 4, 
       "event": "step_line"
     }, 
     {
@@ -1842,7 +1842,7 @@
           ""
         ]
       }, 
-      "line": 1, 
+      "line": 2, 
       "event": "call"
     }, 
     {
@@ -1891,7 +1891,7 @@
           ""
         ]
       }, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -1942,7 +1942,7 @@
           ""
         ]
       }, 
-      "line": 1, 
+      "line": 2, 
       "event": "return"
     }, 
     {
@@ -1966,7 +1966,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 4, 
+      "line": 5, 
       "event": "step_line"
     }, 
     {
@@ -1990,7 +1990,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 3, 
+      "line": 4, 
       "event": "step_line"
     }, 
     {
@@ -2039,7 +2039,7 @@
           ""
         ]
       }, 
-      "line": 1, 
+      "line": 2, 
       "event": "call"
     }, 
     {
@@ -2088,7 +2088,7 @@
           ""
         ]
       }, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2139,7 +2139,7 @@
           ""
         ]
       }, 
-      "line": 1, 
+      "line": 2, 
       "event": "return"
     }, 
     {
@@ -2163,7 +2163,7 @@
           " at 0xADDR>"
         ]
       }, 
-      "line": 3, 
+      "line": 4, 
       "event": "return"
     }
   ]
diff --git a/v3/example-code/happy.golden b/v3/example-code/happy.golden
new file mode 100644
index 000000000..ea1a6a7e0
--- /dev/null
+++ b/v3/example-code/happy.golden
@@ -0,0 +1,952 @@
+{
+  "code": "# From \"Teaching with Python\" by John Zelle\ndef happy():\n    print(\"Happy Birthday to you!\")\n\ndef sing(P):\n    happy()\n    happy()\n    print(\"Happy Birthday dear \" + P + \"!\")\n    happy()\n\n# main\nsing(\"Fred\")\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "happy"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "happy", 
+        "sing"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "sing": [
+          "REF", 
+          2
+        ], 
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "sing(P)", 
+          null
+        ]
+      }, 
+      "line": 12, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "happy", 
+        "sing"
+      ], 
+      "stdout": "", 
+      "func_name": "sing", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "P": "Fred"
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sing", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sing_f1", 
+          "ordered_varnames": [
+            "P"
+          ]
+        }
+      ], 
+      "globals": {
+        "sing": [
+          "REF", 
+          2
+        ], 
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "sing(P)", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "happy", 
+        "sing"
+      ], 
+      "stdout": "", 
+      "func_name": "sing", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "P": "Fred"
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sing", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sing_f1", 
+          "ordered_varnames": [
+            "P"
+          ]
+        }
+      ], 
+      "globals": {
+        "sing": [
+          "REF", 
+          2
+        ], 
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "sing(P)", 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "happy", 
+        "sing"
+      ], 
+      "stdout": "", 
+      "func_name": "happy", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "P": "Fred"
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sing", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sing_f1", 
+          "ordered_varnames": [
+            "P"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "happy", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "happy_f2", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "sing": [
+          "REF", 
+          2
+        ], 
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "sing(P)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "happy", 
+        "sing"
+      ], 
+      "stdout": "", 
+      "func_name": "happy", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "P": "Fred"
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sing", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sing_f1", 
+          "ordered_varnames": [
+            "P"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "happy", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "happy_f2", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "sing": [
+          "REF", 
+          2
+        ], 
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "sing(P)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "happy", 
+        "sing"
+      ], 
+      "stdout": "Happy Birthday to you!\n", 
+      "func_name": "happy", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "P": "Fred"
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sing", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sing_f1", 
+          "ordered_varnames": [
+            "P"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": null
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "happy", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "happy_f2", 
+          "ordered_varnames": [
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "sing": [
+          "REF", 
+          2
+        ], 
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "sing(P)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "happy", 
+        "sing"
+      ], 
+      "stdout": "Happy Birthday to you!\n", 
+      "func_name": "sing", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "P": "Fred"
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sing", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sing_f1", 
+          "ordered_varnames": [
+            "P"
+          ]
+        }
+      ], 
+      "globals": {
+        "sing": [
+          "REF", 
+          2
+        ], 
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "sing(P)", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "happy", 
+        "sing"
+      ], 
+      "stdout": "Happy Birthday to you!\n", 
+      "func_name": "happy", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "P": "Fred"
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sing", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sing_f1", 
+          "ordered_varnames": [
+            "P"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "happy", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "happy_f3", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "sing": [
+          "REF", 
+          2
+        ], 
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "sing(P)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "happy", 
+        "sing"
+      ], 
+      "stdout": "Happy Birthday to you!\n", 
+      "func_name": "happy", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "P": "Fred"
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sing", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sing_f1", 
+          "ordered_varnames": [
+            "P"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "happy", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "happy_f3", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "sing": [
+          "REF", 
+          2
+        ], 
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "sing(P)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "happy", 
+        "sing"
+      ], 
+      "stdout": "Happy Birthday to you!\nHappy Birthday to you!\n", 
+      "func_name": "happy", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "P": "Fred"
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sing", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sing_f1", 
+          "ordered_varnames": [
+            "P"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "__return__": null
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "happy", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "happy_f3", 
+          "ordered_varnames": [
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "sing": [
+          "REF", 
+          2
+        ], 
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "sing(P)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "happy", 
+        "sing"
+      ], 
+      "stdout": "Happy Birthday to you!\nHappy Birthday to you!\n", 
+      "func_name": "sing", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "P": "Fred"
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sing", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sing_f1", 
+          "ordered_varnames": [
+            "P"
+          ]
+        }
+      ], 
+      "globals": {
+        "sing": [
+          "REF", 
+          2
+        ], 
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "sing(P)", 
+          null
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "happy", 
+        "sing"
+      ], 
+      "stdout": "Happy Birthday to you!\nHappy Birthday to you!\nHappy Birthday dear Fred!\n", 
+      "func_name": "sing", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "P": "Fred"
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sing", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sing_f1", 
+          "ordered_varnames": [
+            "P"
+          ]
+        }
+      ], 
+      "globals": {
+        "sing": [
+          "REF", 
+          2
+        ], 
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "sing(P)", 
+          null
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "happy", 
+        "sing"
+      ], 
+      "stdout": "Happy Birthday to you!\nHappy Birthday to you!\nHappy Birthday dear Fred!\n", 
+      "func_name": "happy", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "P": "Fred"
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sing", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sing_f1", 
+          "ordered_varnames": [
+            "P"
+          ]
+        }, 
+        {
+          "frame_id": 4, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "happy", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "happy_f4", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "sing": [
+          "REF", 
+          2
+        ], 
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "sing(P)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "happy", 
+        "sing"
+      ], 
+      "stdout": "Happy Birthday to you!\nHappy Birthday to you!\nHappy Birthday dear Fred!\n", 
+      "func_name": "happy", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "P": "Fred"
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sing", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sing_f1", 
+          "ordered_varnames": [
+            "P"
+          ]
+        }, 
+        {
+          "frame_id": 4, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "happy", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "happy_f4", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "sing": [
+          "REF", 
+          2
+        ], 
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "sing(P)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "happy", 
+        "sing"
+      ], 
+      "stdout": "Happy Birthday to you!\nHappy Birthday to you!\nHappy Birthday dear Fred!\nHappy Birthday to you!\n", 
+      "func_name": "happy", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "P": "Fred"
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sing", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sing_f1", 
+          "ordered_varnames": [
+            "P"
+          ]
+        }, 
+        {
+          "frame_id": 4, 
+          "encoded_locals": {
+            "__return__": null
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "happy", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "happy_f4", 
+          "ordered_varnames": [
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "sing": [
+          "REF", 
+          2
+        ], 
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "sing(P)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "happy", 
+        "sing"
+      ], 
+      "stdout": "Happy Birthday to you!\nHappy Birthday to you!\nHappy Birthday dear Fred!\nHappy Birthday to you!\n", 
+      "func_name": "sing", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": null, 
+            "P": "Fred"
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sing", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sing_f1", 
+          "ordered_varnames": [
+            "P", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "sing": [
+          "REF", 
+          2
+        ], 
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "sing(P)", 
+          null
+        ]
+      }, 
+      "line": 9, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "happy", 
+        "sing"
+      ], 
+      "stdout": "Happy Birthday to you!\nHappy Birthday to you!\nHappy Birthday dear Fred!\nHappy Birthday to you!\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "sing": [
+          "REF", 
+          2
+        ], 
+        "happy": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "happy()", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "sing(P)", 
+          null
+        ]
+      }, 
+      "line": 12, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/example-code/linked-lists/ll2.golden b/v3/example-code/linked-lists/ll2.golden
index 3e52ba4a4..6437333ed 100644
--- a/v3/example-code/linked-lists/ll2.golden
+++ b/v3/example-code/linked-lists/ll2.golden
@@ -1324,6 +1324,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -1336,7 +1340,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }
       ], 
@@ -1433,6 +1438,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -1467,6 +1486,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -1479,7 +1502,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }
       ], 
@@ -1577,6 +1601,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -1611,6 +1649,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -1623,7 +1665,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }
       ], 
@@ -1721,6 +1764,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -1755,6 +1812,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -1767,7 +1828,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -1889,6 +1951,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -1927,6 +2003,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -1939,7 +2019,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -2061,6 +2142,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -2099,6 +2194,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -2111,7 +2210,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -2233,6 +2333,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -2275,6 +2389,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -2287,7 +2405,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -2411,6 +2530,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -2457,6 +2590,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -2469,7 +2606,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }
       ], 
@@ -2570,6 +2708,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -2616,6 +2768,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -2628,7 +2784,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }
       ], 
@@ -2729,6 +2886,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -2775,6 +2946,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -2787,7 +2962,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -2915,6 +3091,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -2965,6 +3155,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -2977,7 +3171,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -3105,6 +3300,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -3155,6 +3364,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -3167,7 +3380,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -3295,6 +3509,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -3349,6 +3577,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -3361,7 +3593,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -3491,6 +3724,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -3552,6 +3799,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -3564,7 +3815,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }
       ], 
@@ -3665,6 +3917,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -3726,6 +3992,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -3738,7 +4008,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }
       ], 
@@ -3839,6 +4110,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -3900,6 +4185,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -3912,7 +4201,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -4040,6 +4330,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -4105,6 +4409,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -4117,7 +4425,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -4245,6 +4554,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -4310,6 +4633,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -4322,7 +4649,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -4450,6 +4778,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -4519,6 +4861,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -4531,7 +4877,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -4661,6 +5008,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -4737,6 +5098,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -4749,7 +5114,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }
       ], 
@@ -4850,6 +5216,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -4926,6 +5306,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -4938,7 +5322,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }
       ], 
@@ -5039,6 +5424,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -5115,6 +5514,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -5127,7 +5530,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -5255,6 +5659,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -5335,6 +5753,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -5347,7 +5769,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -5475,6 +5898,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -5555,6 +5992,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -5567,7 +6008,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -5695,6 +6137,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -5779,6 +6235,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -5791,7 +6251,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -5921,6 +6382,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -6012,6 +6487,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -6024,7 +6503,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }
       ], 
@@ -6111,17 +6591,31 @@
             ]
           ]
         ], 
-        "6": [
+        "6": [
+          "DICT", 
+          [
+            "data", 
+            1
+          ], 
+          [
+            "next", 
+            [
+              "REF", 
+              5
+            ]
+          ]
+        ], 
+        "7": [
           "DICT", 
           [
-            "data", 
-            1
+            "__doc__", 
+            null
           ], 
           [
-            "next", 
+            "__init__", 
             [
               "REF", 
-              5
+              8
             ]
           ]
         ], 
@@ -6216,6 +6710,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -6228,7 +6726,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }
       ], 
@@ -6329,6 +6828,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -6420,6 +6933,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -6432,7 +6949,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -6560,6 +7078,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -6655,6 +7187,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -6667,7 +7203,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -6795,6 +7332,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -6890,6 +7441,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -6902,7 +7457,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -7030,6 +7586,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -7129,6 +7699,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -7141,7 +7715,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -7271,6 +7846,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -7377,6 +7966,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -7389,7 +7982,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }
       ], 
@@ -7490,6 +8084,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -7596,6 +8204,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -7608,7 +8220,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }
       ], 
@@ -7709,6 +8322,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -7815,6 +8442,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -7827,7 +8458,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -7955,6 +8587,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -8065,6 +8711,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -8077,7 +8727,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -8205,6 +8856,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -8315,6 +8980,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -8327,7 +8996,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -8455,6 +9125,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -8569,6 +9253,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -8581,7 +9269,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }, 
         {
@@ -8711,6 +9400,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -8832,6 +9535,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -8844,7 +9551,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }
       ], 
@@ -8945,6 +9653,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
@@ -9066,6 +9788,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              7
+            ], 
             "__init__": [
               "REF", 
               8
@@ -9078,7 +9804,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "Node_f1_p_z", 
           "ordered_varnames": [
-            "__init__"
+            "__init__", 
+            "__return__"
           ]
         }
       ], 
@@ -9179,6 +9906,20 @@
             ]
           ]
         ], 
+        "7": [
+          "DICT", 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
         "8": [
           "FUNCTION", 
           "__init__(self, data, next)", 
diff --git a/v3/example-code/map.golden b/v3/example-code/map.golden
index ea180d541..e0181c7ec 100644
--- a/v3/example-code/map.golden
+++ b/v3/example-code/map.golden
@@ -6879,6 +6879,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              15
+            ], 
             "lst": [
               "REF", 
               3
@@ -6891,7 +6895,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "halveElements_f1_p_z", 
           "ordered_varnames": [
-            "lst"
+            "lst", 
+            "__return__"
           ]
         }
       ], 
diff --git a/v3/example-code/oop_1.golden b/v3/example-code/oop_1.golden
index 68e914e00..00c24716a 100644
--- a/v3/example-code/oop_1.golden
+++ b/v3/example-code/oop_1.golden
@@ -245,7 +245,11 @@
               "REF", 
               1
             ], 
-            "room": 501
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -257,7 +261,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -273,6 +278,32 @@
           "salutation(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -318,7 +349,11 @@
               "REF", 
               1
             ], 
-            "room": 501
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -330,7 +365,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -350,6 +386,32 @@
           "salutation(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -399,7 +461,11 @@
               "REF", 
               1
             ], 
-            "room": 501
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -411,7 +477,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -431,6 +498,32 @@
           "salutation(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -480,7 +573,11 @@
               "REF", 
               1
             ], 
-            "room": 501
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -492,7 +589,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -512,6 +610,32 @@
           "salutation(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -565,7 +689,11 @@
               "REF", 
               1
             ], 
-            "room": 501
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -577,7 +705,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -597,6 +726,32 @@
           "salutation(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -654,7 +809,11 @@
               "REF", 
               1
             ], 
-            "room": 501
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -666,7 +825,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -686,6 +846,32 @@
           "salutation(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -747,7 +933,11 @@
               "REF", 
               1
             ], 
-            "room": 501
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -759,7 +949,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -779,6 +970,32 @@
           "salutation(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -840,7 +1057,11 @@
               "REF", 
               1
             ], 
-            "room": 501
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -852,7 +1073,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -872,6 +1094,32 @@
           "salutation(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -937,7 +1185,11 @@
               "REF", 
               1
             ], 
-            "room": 501
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -949,7 +1201,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -969,6 +1222,32 @@
           "salutation(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1034,7 +1313,11 @@
               "REF", 
               1
             ], 
-            "room": 501
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -1046,7 +1329,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1086,6 +1370,32 @@
           "salutation(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1151,7 +1461,11 @@
               "REF", 
               1
             ], 
-            "room": 501
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -1163,7 +1477,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1203,6 +1518,32 @@
           "salutation(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1268,7 +1609,11 @@
               "REF", 
               1
             ], 
-            "room": 501
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -1280,7 +1625,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1322,6 +1668,32 @@
           "salutation(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1387,7 +1759,11 @@
               "REF", 
               1
             ], 
-            "room": 501
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -1399,7 +1775,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -1419,6 +1796,32 @@
           "salutation(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1484,7 +1887,11 @@
               "REF", 
               1
             ], 
-            "room": 501
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -1496,7 +1903,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1536,6 +1944,32 @@
           "salutation(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1601,7 +2035,11 @@
               "REF", 
               1
             ], 
-            "room": 501
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -1613,7 +2051,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1653,6 +2092,32 @@
           "salutation(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1718,7 +2183,11 @@
               "REF", 
               1
             ], 
-            "room": 501
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -1730,7 +2199,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1772,6 +2242,32 @@
           "salutation(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1837,7 +2333,11 @@
               "REF", 
               1
             ], 
-            "room": 501
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              2
+            ]
           }, 
           "is_highlighted": false, 
           "is_parent": true, 
@@ -1849,7 +2349,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -1869,6 +2370,32 @@
           "salutation(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
diff --git a/v3/example-code/oop_2.golden b/v3/example-code/oop_2.golden
index ea8435ae1..d7b8d5918 100644
--- a/v3/example-code/oop_2.golden
+++ b/v3/example-code/oop_2.golden
@@ -298,12 +298,16 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
+            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
-            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -320,7 +324,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -341,6 +346,39 @@
           "salutation(self)", 
           1
         ], 
+        "3": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -387,12 +425,16 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
+            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
-            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -409,7 +451,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -458,6 +501,39 @@
           "salutation(self)", 
           1
         ], 
+        "3": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -508,12 +584,16 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
+            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
-            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -530,7 +610,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -579,6 +660,39 @@
           "salutation(self)", 
           1
         ], 
+        "3": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -629,12 +743,16 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
+            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
-            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -651,7 +769,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -700,6 +819,39 @@
           "salutation(self)", 
           1
         ], 
+        "3": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -754,12 +906,16 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
+            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
-            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -776,7 +932,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -825,6 +982,39 @@
           "salutation(self)", 
           1
         ], 
+        "3": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -883,12 +1073,16 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
+            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
-            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -905,7 +1099,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -954,6 +1149,39 @@
           "salutation(self)", 
           1
         ], 
+        "3": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -1016,12 +1244,16 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
+            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
-            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -1038,7 +1270,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1089,6 +1322,39 @@
           "salutation(self)", 
           1
         ], 
+        "3": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -1156,12 +1422,16 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
+            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
-            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -1178,7 +1448,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -1203,6 +1474,39 @@
           "salutation(self)", 
           1
         ], 
+        "3": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -1270,12 +1574,16 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
+            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
-            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -1292,7 +1600,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1337,6 +1646,39 @@
           "salutation(self)", 
           1
         ], 
+        "3": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -1404,12 +1746,16 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
+            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
-            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -1426,7 +1772,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1471,6 +1818,39 @@
           "salutation(self)", 
           1
         ], 
+        "3": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -1538,12 +1918,16 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
+            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
-            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -1560,7 +1944,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1607,6 +1992,39 @@
           "salutation(self)", 
           1
         ], 
+        "3": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "4": [
           "CLASS", 
           "Staff601", 
@@ -1674,12 +2092,16 @@
           "frame_id": 1, 
           "encoded_locals": {
             "building": 34, 
+            "__return__": [
+              "REF", 
+              3
+            ], 
+            "room": 501, 
             "course": "6.01", 
             "salutation": [
               "REF", 
               2
             ], 
-            "room": 501, 
             "__init__": [
               "REF", 
               1
@@ -1696,7 +2118,8 @@
             "building", 
             "course", 
             "room", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -1721,6 +2144,39 @@
           "salutation(self)", 
           1
         ], 
+        "3": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "4": [
           "CLASS", 
           "Staff601", 
diff --git a/v3/example-code/oop_inherit.golden b/v3/example-code/oop_inherit.golden
index 50bd66a66..8b3640434 100644
--- a/v3/example-code/oop_inherit.golden
+++ b/v3/example-code/oop_inherit.golden
@@ -241,6 +241,10 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "giveRaise": [
               "REF", 
               1
@@ -257,7 +261,8 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room"
+            "room", 
+            "__return__"
           ]
         }
       ], 
@@ -273,6 +278,32 @@
           "giveRaise(self, percentage)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -313,6 +344,10 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "giveRaise": [
               "REF", 
               1
@@ -329,7 +364,8 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room"
+            "room", 
+            "__return__"
           ]
         }, 
         {
@@ -356,6 +392,32 @@
           "giveRaise(self, percentage)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -396,6 +458,10 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "giveRaise": [
               "REF", 
               1
@@ -412,7 +478,8 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room"
+            "room", 
+            "__return__"
           ]
         }, 
         {
@@ -439,6 +506,32 @@
           "giveRaise(self, percentage)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -479,6 +572,10 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "giveRaise": [
               "REF", 
               1
@@ -495,7 +592,8 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room"
+            "room", 
+            "__return__"
           ]
         }, 
         {
@@ -522,6 +620,32 @@
           "giveRaise(self, percentage)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -562,6 +686,10 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "giveRaise": [
               "REF", 
               1
@@ -578,7 +706,8 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room"
+            "room", 
+            "__return__"
           ]
         }, 
         {
@@ -609,6 +738,32 @@
           "giveRaise(self, percentage)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -649,6 +804,10 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "giveRaise": [
               "REF", 
               1
@@ -665,7 +824,8 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room"
+            "room", 
+            "__return__"
           ]
         }, 
         {
@@ -701,6 +861,32 @@
           "giveRaise(self, percentage)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -746,6 +932,10 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "giveRaise": [
               "REF", 
               1
@@ -762,7 +952,8 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room"
+            "room", 
+            "__return__"
           ]
         }, 
         {
@@ -808,6 +999,32 @@
           "giveRaise(self, percentage)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -880,6 +1097,10 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "giveRaise": [
               "REF", 
               1
@@ -896,13 +1117,18 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room"
+            "room", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
+            "__return__": [
+              "REF", 
+              6
+            ], 
             "salutation": [
               "REF", 
               5
@@ -921,7 +1147,8 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -941,6 +1168,32 @@
           "giveRaise(self, percentage)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -975,8 +1228,33 @@
           "salutation(self)", 
           2
         ], 
-        "7": [
-          "CLASS", 
+        "6": [
+          "DICT", 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              4
+            ]
+          ]
+        ], 
+        "7": [
+          "CLASS", 
           "Prof601", 
           [
             "Staff601"
@@ -1017,6 +1295,10 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "giveRaise": [
               "REF", 
               1
@@ -1033,13 +1315,18 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room"
+            "room", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
+            "__return__": [
+              "REF", 
+              6
+            ], 
             "salutation": [
               "REF", 
               5
@@ -1058,7 +1345,8 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1102,6 +1390,32 @@
           "giveRaise(self, percentage)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1136,6 +1450,31 @@
           "salutation(self)", 
           2
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              4
+            ]
+          ]
+        ], 
         "7": [
           "CLASS", 
           "Prof601", 
@@ -1182,6 +1521,10 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "giveRaise": [
               "REF", 
               1
@@ -1198,13 +1541,18 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room"
+            "room", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
+            "__return__": [
+              "REF", 
+              6
+            ], 
             "salutation": [
               "REF", 
               5
@@ -1223,7 +1571,8 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1267,6 +1616,32 @@
           "giveRaise(self, percentage)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1301,6 +1676,31 @@
           "salutation(self)", 
           2
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              4
+            ]
+          ]
+        ], 
         "7": [
           "CLASS", 
           "Prof601", 
@@ -1347,6 +1747,10 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "giveRaise": [
               "REF", 
               1
@@ -1363,13 +1767,18 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room"
+            "room", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
+            "__return__": [
+              "REF", 
+              6
+            ], 
             "salutation": [
               "REF", 
               5
@@ -1388,7 +1797,8 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1432,6 +1842,32 @@
           "giveRaise(self, percentage)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1466,6 +1902,31 @@
           "salutation(self)", 
           2
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              4
+            ]
+          ]
+        ], 
         "7": [
           "CLASS", 
           "Prof601", 
@@ -1516,6 +1977,10 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "giveRaise": [
               "REF", 
               1
@@ -1532,13 +1997,18 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room"
+            "room", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
+            "__return__": [
+              "REF", 
+              6
+            ], 
             "salutation": [
               "REF", 
               5
@@ -1557,7 +2027,8 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1623,6 +2094,32 @@
           "giveRaise(self, percentage)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1657,6 +2154,31 @@
           "salutation(self)", 
           2
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              4
+            ]
+          ]
+        ], 
         "7": [
           "CLASS", 
           "Prof601", 
@@ -1707,6 +2229,10 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "giveRaise": [
               "REF", 
               1
@@ -1723,13 +2249,18 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room"
+            "room", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
+            "__return__": [
+              "REF", 
+              6
+            ], 
             "salutation": [
               "REF", 
               5
@@ -1748,7 +2279,8 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1814,6 +2346,32 @@
           "giveRaise(self, percentage)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -1848,6 +2406,31 @@
           "salutation(self)", 
           2
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              4
+            ]
+          ]
+        ], 
         "7": [
           "CLASS", 
           "Prof601", 
@@ -1898,6 +2481,10 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "giveRaise": [
               "REF", 
               1
@@ -1914,13 +2501,18 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room"
+            "room", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
+            "__return__": [
+              "REF", 
+              6
+            ], 
             "salutation": [
               "REF", 
               5
@@ -1939,7 +2531,8 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -2007,6 +2600,32 @@
           "giveRaise(self, percentage)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -2041,6 +2660,31 @@
           "salutation(self)", 
           2
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              4
+            ]
+          ]
+        ], 
         "7": [
           "CLASS", 
           "Prof601", 
@@ -2095,6 +2739,10 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "giveRaise": [
               "REF", 
               1
@@ -2111,13 +2759,18 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room"
+            "room", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
+            "__return__": [
+              "REF", 
+              6
+            ], 
             "salutation": [
               "REF", 
               5
@@ -2136,7 +2789,8 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -2182,6 +2836,32 @@
           "giveRaise(self, percentage)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -2216,6 +2896,31 @@
           "salutation(self)", 
           2
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              4
+            ]
+          ]
+        ], 
         "7": [
           "CLASS", 
           "Prof601", 
@@ -2271,6 +2976,10 @@
           "encoded_locals": {
             "building": 34, 
             "course": "6.01", 
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "giveRaise": [
               "REF", 
               1
@@ -2287,13 +2996,18 @@
             "building", 
             "course", 
             "giveRaise", 
-            "room"
+            "room", 
+            "__return__"
           ]
         }, 
         {
           "frame_id": 2, 
           "encoded_locals": {
             "salary": 100000, 
+            "__return__": [
+              "REF", 
+              6
+            ], 
             "salutation": [
               "REF", 
               5
@@ -2312,7 +3026,8 @@
           "ordered_varnames": [
             "__init__", 
             "salary", 
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -2336,6 +3051,32 @@
           "giveRaise(self, percentage)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "CLASS", 
           "Staff601", 
@@ -2370,6 +3111,31 @@
           "salutation(self)", 
           2
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              4
+            ]
+          ]
+        ], 
         "7": [
           "CLASS", 
           "Prof601", 
diff --git a/v3/example-code/oop_small.golden b/v3/example-code/oop_small.golden
index aa6ea12ec..44bf5c717 100644
--- a/v3/example-code/oop_small.golden
+++ b/v3/example-code/oop_small.golden
@@ -682,6 +682,10 @@
             "salutation": [
               "REF", 
               5
+            ], 
+            "__return__": [
+              "REF", 
+              6
             ]
           }, 
           "is_highlighted": false, 
@@ -691,7 +695,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -737,6 +742,20 @@
           "salutation(self)", 
           3
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -772,6 +791,10 @@
             "salutation": [
               "REF", 
               5
+            ], 
+            "__return__": [
+              "REF", 
+              6
             ]
           }, 
           "is_highlighted": false, 
@@ -781,7 +804,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -804,10 +828,6 @@
         ]
       }, 
       "heap": {
-        "8": [
-          "INSTANCE", 
-          "C"
-        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -835,6 +855,20 @@
           "salutation(self)", 
           3
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -849,6 +883,10 @@
               5
             ]
           ]
+        ], 
+        "8": [
+          "INSTANCE", 
+          "C"
         ]
       }, 
       "line": 13, 
@@ -870,6 +908,10 @@
             "salutation": [
               "REF", 
               5
+            ], 
+            "__return__": [
+              "REF", 
+              6
             ]
           }, 
           "is_highlighted": false, 
@@ -879,7 +921,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -922,10 +965,6 @@
         ]
       }, 
       "heap": {
-        "8": [
-          "INSTANCE", 
-          "C"
-        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -953,6 +992,20 @@
           "salutation(self)", 
           3
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -967,6 +1020,10 @@
               5
             ]
           ]
+        ], 
+        "8": [
+          "INSTANCE", 
+          "C"
         ]
       }, 
       "line": 9, 
@@ -988,6 +1045,10 @@
             "salutation": [
               "REF", 
               5
+            ], 
+            "__return__": [
+              "REF", 
+              6
             ]
           }, 
           "is_highlighted": false, 
@@ -997,7 +1058,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1040,10 +1102,6 @@
         ]
       }, 
       "heap": {
-        "8": [
-          "INSTANCE", 
-          "C"
-        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -1071,6 +1129,20 @@
           "salutation(self)", 
           3
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -1085,6 +1157,10 @@
               5
             ]
           ]
+        ], 
+        "8": [
+          "INSTANCE", 
+          "C"
         ]
       }, 
       "line": 10, 
@@ -1106,6 +1182,10 @@
             "salutation": [
               "REF", 
               5
+            ], 
+            "__return__": [
+              "REF", 
+              6
             ]
           }, 
           "is_highlighted": false, 
@@ -1115,7 +1195,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1160,10 +1241,6 @@
         ]
       }, 
       "heap": {
-        "8": [
-          "INSTANCE", 
-          "C"
-        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -1191,6 +1268,20 @@
           "salutation(self)", 
           3
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -1205,6 +1296,10 @@
               5
             ]
           ]
+        ], 
+        "8": [
+          "INSTANCE", 
+          "C"
         ]
       }, 
       "line": 10, 
@@ -1226,6 +1321,10 @@
             "salutation": [
               "REF", 
               5
+            ], 
+            "__return__": [
+              "REF", 
+              6
             ]
           }, 
           "is_highlighted": false, 
@@ -1235,7 +1334,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -1258,10 +1358,6 @@
         ]
       }, 
       "heap": {
-        "8": [
-          "INSTANCE", 
-          "C"
-        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -1289,6 +1385,20 @@
           "salutation(self)", 
           3
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -1303,6 +1413,10 @@
               5
             ]
           ]
+        ], 
+        "8": [
+          "INSTANCE", 
+          "C"
         ]
       }, 
       "line": 14, 
@@ -1324,6 +1438,10 @@
             "salutation": [
               "REF", 
               5
+            ], 
+            "__return__": [
+              "REF", 
+              6
             ]
           }, 
           "is_highlighted": false, 
@@ -1333,7 +1451,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -1356,14 +1475,6 @@
         ]
       }, 
       "heap": {
-        "8": [
-          "INSTANCE", 
-          "C", 
-          [
-            "x", 
-            100
-          ]
-        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -1391,6 +1502,20 @@
           "salutation(self)", 
           3
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -1405,6 +1530,14 @@
               5
             ]
           ]
+        ], 
+        "8": [
+          "INSTANCE", 
+          "C", 
+          [
+            "x", 
+            100
+          ]
         ]
       }, 
       "line": 15, 
@@ -1426,6 +1559,10 @@
             "salutation": [
               "REF", 
               5
+            ], 
+            "__return__": [
+              "REF", 
+              6
             ]
           }, 
           "is_highlighted": false, 
@@ -1435,7 +1572,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1478,14 +1616,6 @@
         ]
       }, 
       "heap": {
-        "8": [
-          "INSTANCE", 
-          "C", 
-          [
-            "x", 
-            100
-          ]
-        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -1513,6 +1643,20 @@
           "salutation(self)", 
           3
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -1527,6 +1671,14 @@
               5
             ]
           ]
+        ], 
+        "8": [
+          "INSTANCE", 
+          "C", 
+          [
+            "x", 
+            100
+          ]
         ]
       }, 
       "line": 9, 
@@ -1548,6 +1700,10 @@
             "salutation": [
               "REF", 
               5
+            ], 
+            "__return__": [
+              "REF", 
+              6
             ]
           }, 
           "is_highlighted": false, 
@@ -1557,7 +1713,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1600,14 +1757,6 @@
         ]
       }, 
       "heap": {
-        "8": [
-          "INSTANCE", 
-          "C", 
-          [
-            "x", 
-            100
-          ]
-        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -1635,6 +1784,20 @@
           "salutation(self)", 
           3
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -1649,6 +1812,14 @@
               5
             ]
           ]
+        ], 
+        "8": [
+          "INSTANCE", 
+          "C", 
+          [
+            "x", 
+            100
+          ]
         ]
       }, 
       "line": 10, 
@@ -1670,6 +1841,10 @@
             "salutation": [
               "REF", 
               5
+            ], 
+            "__return__": [
+              "REF", 
+              6
             ]
           }, 
           "is_highlighted": false, 
@@ -1679,7 +1854,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }, 
         {
@@ -1724,14 +1900,6 @@
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       }, 
       "heap": {
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-          "INSTANCE", 
-          "C", 
-          [
-            "x", 
-            100
-          ]
-        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -1759,6 +1927,20 @@
           "salutation(self)", 
           3
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -1773,6 +1955,14 @@
               5
             ]
           ]
+        ], 
+        "8": [
+          "INSTANCE", 
+          "C", 
+          [
+            "x", 
+            100
+          ]
         ]
       }, 
       "line": 10, 
@@ -1794,6 +1984,10 @@
             "salutation": [
               "REF", 
               5
+            ], 
+            "__return__": [
+              "REF", 
+              6
             ]
           }, 
           "is_highlighted": false, 
@@ -1803,7 +1997,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "C_f3_p_z", 
           "ordered_varnames": [
-            "salutation"
+            "salutation", 
+            "__return__"
           ]
         }
       ], 
@@ -1826,14 +2021,6 @@
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       }, 
       "heap": {
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-          "INSTANCE", 
-          "C", 
-          [
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-            100
-          ]
-        ], 
         "2": [
           "CLASS", 
           "A", 
@@ -1861,6 +2048,20 @@
           "salutation(self)", 
           3
         ], 
+        "6": [
+          "DICT", 
+          [
+            "salutation", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "7": [
           "CLASS", 
           "C", 
@@ -1875,6 +2076,14 @@
               5
             ]
           ]
+        ], 
+        "8": [
+          "INSTANCE", 
+          "C", 
+          [
+            "x", 
+            100
+          ]
         ]
       }, 
       "line": 15, 
diff --git a/v3/example-code/sqrt.golden b/v3/example-code/sqrt.golden
index d062b58ee..f091f44c5 100644
--- a/v3/example-code/sqrt.golden
+++ b/v3/example-code/sqrt.golden
@@ -8853,6 +8853,15 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "sqrt_iter": [
+              "REF", 
+              5
+            ], 
+            "is_good_enough": [
+              "REF", 
+              3
+            ], 
+            "__return__": 3.0001, 
             "x": 9, 
             "average": [
               "REF", 
@@ -8861,14 +8870,6 @@
             "improve": [
               "REF", 
               4
-            ], 
-            "sqrt_iter": [
-              "REF", 
-              5
-            ], 
-            "is_good_enough": [
-              "REF", 
-              3
             ]
           }, 
           "is_highlighted": false, 
@@ -8882,7 +8883,8 @@
             "average", 
             "improve", 
             "is_good_enough", 
-            "sqrt_iter"
+            "sqrt_iter", 
+            "__return__"
           ]
         }
       ], 
diff --git a/v3/example-code/sum-list.golden b/v3/example-code/sum-list.golden
new file mode 100644
index 000000000..c121417d9
--- /dev/null
+++ b/v3/example-code/sum-list.golden
@@ -0,0 +1,3466 @@
+{
+  "code": "myList = (1, (2, (3, (4, (5, None)))))\n\ndef sumList(node, subtotal):\n  if not node:\n    return subtotal\n  else:\n    return sumList(node[1], subtotal + node[0])\n\ntotal = sumList(myList, 0)\n", 
+  "trace": [
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+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
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+}
diff --git a/v3/example-code/sum.golden b/v3/example-code/sum.golden
index d70d98a11..0186b5dff 100644
--- a/v3/example-code/sum.golden
+++ b/v3/example-code/sum.golden
@@ -10118,6 +10118,7 @@
           "frame_id": 1, 
           "encoded_locals": {
             "high": 10, 
+            "__return__": 385, 
             "low": 1
           }, 
           "is_highlighted": false, 
@@ -10128,7 +10129,8 @@
           "unique_hash": "sumsquares_f1_p_z", 
           "ordered_varnames": [
             "low", 
-            "high"
+            "high", 
+            "__return__"
           ]
         }
       ], 
diff --git a/v3/tests/backend-tests/class_test.golden b/v3/tests/backend-tests/class_test.golden
index d0770d384..882d13ef9 100644
--- a/v3/tests/backend-tests/class_test.golden
+++ b/v3/tests/backend-tests/class_test.golden
@@ -189,6 +189,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -206,7 +210,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }
       ], 
@@ -222,6 +227,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -260,6 +286,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -277,7 +307,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }, 
         {
@@ -317,6 +348,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -359,6 +411,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -376,7 +432,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }, 
         {
@@ -416,6 +473,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -458,6 +536,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -475,7 +557,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }, 
         {
@@ -515,6 +598,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -561,6 +665,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -578,7 +686,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }, 
         {
@@ -620,6 +729,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -671,6 +801,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -688,7 +822,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }
       ], 
@@ -708,6 +843,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -759,6 +915,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -776,7 +936,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }, 
         {
@@ -816,6 +977,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -867,6 +1049,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -884,7 +1070,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }, 
         {
@@ -924,6 +1111,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -975,6 +1183,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -992,7 +1204,8 @@
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           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }, 
         {
@@ -1034,6 +1247,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -1085,6 +1319,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -1102,7 +1340,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }
       ], 
@@ -1122,6 +1361,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -1173,6 +1433,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -1190,7 +1454,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }, 
         {
@@ -1234,6 +1499,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -1289,6 +1575,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -1306,7 +1596,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }, 
         {
@@ -1350,6 +1641,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -1405,6 +1717,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -1422,7 +1738,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }, 
         {
@@ -1466,6 +1783,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -1525,6 +1863,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -1542,7 +1884,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }, 
         {
@@ -1588,6 +1931,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -1652,6 +2016,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -1669,7 +2037,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }
       ], 
@@ -1693,6 +2062,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -1757,6 +2147,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -1774,7 +2168,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }, 
         {
@@ -1818,6 +2213,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -1882,6 +2298,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -1899,7 +2319,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }, 
         {
@@ -1943,6 +2364,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -2007,6 +2449,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -2024,7 +2470,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }, 
         {
@@ -2070,6 +2517,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
@@ -2134,6 +2602,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "__str__": [
               "REF", 
               3
@@ -2151,7 +2623,8 @@
           "unique_hash": "Point_f1_p_z", 
           "ordered_varnames": [
             "__init__", 
-            "__str__"
+            "__str__", 
+            "__return__"
           ]
         }
       ], 
@@ -2175,6 +2648,27 @@
           "__init__(self, x, y)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ], 
+          [
+            "__doc__", 
+            null
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "__str__(self)", 
diff --git a/v3/tests/backend-tests/john-compose.golden b/v3/tests/backend-tests/john-compose.golden
index 1272f090b..9acb62b04 100644
--- a/v3/tests/backend-tests/john-compose.golden
+++ b/v3/tests/backend-tests/john-compose.golden
@@ -226,6 +226,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "g": [
               "REF", 
               2
@@ -243,7 +247,8 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }
       ], 
@@ -293,6 +298,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "g": [
               "REF", 
               2
@@ -310,7 +319,8 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -377,6 +387,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "g": [
               "REF", 
               2
@@ -394,7 +408,8 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -461,6 +476,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "g": [
               "REF", 
               2
@@ -478,7 +497,8 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -560,6 +580,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "g": [
               "REF", 
               2
@@ -577,7 +601,8 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -659,6 +684,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "g": [
               "REF", 
               2
@@ -676,7 +705,8 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -760,6 +790,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "g": [
               "REF", 
               2
@@ -777,7 +811,8 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -859,6 +894,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "g": [
               "REF", 
               2
@@ -876,7 +915,8 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -958,6 +998,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "g": [
               "REF", 
               2
@@ -975,7 +1019,8 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -1059,6 +1104,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "g": [
               "REF", 
               2
@@ -1076,7 +1125,8 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }, 
         {
@@ -1146,6 +1196,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              4
+            ], 
             "g": [
               "REF", 
               2
@@ -1163,7 +1217,8 @@
           "unique_hash": "compose1_f1_p_z", 
           "ordered_varnames": [
             "f", 
-            "g"
+            "g", 
+            "__return__"
           ]
         }
       ], 
diff --git a/v3/tests/backend-tests/lambda_1.golden b/v3/tests/backend-tests/lambda_1.golden
index dbc526b25..329be1475 100644
--- a/v3/tests/backend-tests/lambda_1.golden
+++ b/v3/tests/backend-tests/lambda_1.golden
@@ -5448,6 +5448,7 @@
           "frame_id": 1, 
           "encoded_locals": {
             "high": 5, 
+            "__return__": 55, 
             "low": 1
           }, 
           "is_highlighted": false, 
@@ -5458,7 +5459,8 @@
           "unique_hash": "sumsquares_f1_p_z", 
           "ordered_varnames": [
             "low", 
-            "high"
+            "high", 
+            "__return__"
           ]
         }
       ], 
diff --git a/v3/tests/backend-tests/ling-scheme-2.golden b/v3/tests/backend-tests/ling-scheme-2.golden
index c5c7075fa..add7f461f 100644
--- a/v3/tests/backend-tests/ling-scheme-2.golden
+++ b/v3/tests/backend-tests/ling-scheme-2.golden
@@ -3728,6 +3728,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              9
+            ], 
             "loop": [
               "REF", 
               2
@@ -3742,7 +3746,8 @@
           "unique_hash": "iota_f1_p_z", 
           "ordered_varnames": [
             "n", 
-            "loop"
+            "loop", 
+            "__return__"
           ]
         }
       ], 
diff --git a/v3/tests/backend-tests/ling-scheme-3.golden b/v3/tests/backend-tests/ling-scheme-3.golden
index 2222c5742..be3b46e8e 100644
--- a/v3/tests/backend-tests/ling-scheme-3.golden
+++ b/v3/tests/backend-tests/ling-scheme-3.golden
@@ -8513,6 +8513,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              28
+            ], 
             "xs": [
               "REF", 
               4
@@ -8525,7 +8529,8 @@
           "parent_frame_id_list": [], 
           "unique_hash": "pairs_f1_p_z", 
           "ordered_varnames": [
-            "xs"
+            "xs", 
+            "__return__"
           ]
         }
       ], 
diff --git a/v3/tests/backend-tests/newstyle_class.golden b/v3/tests/backend-tests/newstyle_class.golden
index 3718cc971..f428115c5 100644
--- a/v3/tests/backend-tests/newstyle_class.golden
+++ b/v3/tests/backend-tests/newstyle_class.golden
@@ -223,6 +223,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": [
               "REF", 
               3
@@ -242,7 +246,8 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x"
+            "x", 
+            "__return__"
           ]
         }
       ], 
@@ -258,6 +263,27 @@
           "__init__(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "x", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "bla", 
+            "A"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -300,6 +326,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": [
               "REF", 
               3
@@ -319,7 +349,8 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x"
+            "x", 
+            "__return__"
           ]
         }, 
         {
@@ -355,6 +386,27 @@
           "__init__(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "x", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "bla", 
+            "A"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -401,6 +453,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": [
               "REF", 
               3
@@ -420,7 +476,8 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x"
+            "x", 
+            "__return__"
           ]
         }, 
         {
@@ -456,6 +513,27 @@
           "__init__(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "x", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "bla", 
+            "A"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -502,6 +580,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": [
               "REF", 
               3
@@ -521,7 +603,8 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x"
+            "x", 
+            "__return__"
           ]
         }, 
         {
@@ -559,6 +642,27 @@
           "__init__(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "x", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "bla", 
+            "A"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -610,6 +714,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": [
               "REF", 
               3
@@ -629,7 +737,8 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x"
+            "x", 
+            "__return__"
           ]
         }
       ], 
@@ -649,6 +758,27 @@
           "__init__(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "x", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "bla", 
+            "A"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -700,6 +830,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": [
               "REF", 
               3
@@ -719,7 +853,8 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x"
+            "x", 
+            "__return__"
           ]
         }, 
         {
@@ -759,6 +894,27 @@
           "__init__(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "x", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "bla", 
+            "A"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -810,6 +966,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": [
               "REF", 
               3
@@ -829,7 +989,8 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x"
+            "x", 
+            "__return__"
           ]
         }, 
         {
@@ -869,6 +1030,27 @@
           "__init__(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "x", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "bla", 
+            "A"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -920,6 +1102,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": [
               "REF", 
               3
@@ -939,7 +1125,8 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x"
+            "x", 
+            "__return__"
           ]
         }, 
         {
@@ -981,6 +1168,27 @@
           "__init__(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "x", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "bla", 
+            "A"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -1036,6 +1244,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": [
               "REF", 
               3
@@ -1055,7 +1267,8 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x"
+            "x", 
+            "__return__"
           ]
         }
       ], 
@@ -1075,6 +1288,27 @@
           "__init__(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "x", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "bla", 
+            "A"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -1130,6 +1364,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": [
               "REF", 
               3
@@ -1149,7 +1387,8 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x"
+            "x", 
+            "__return__"
           ]
         }
       ], 
@@ -1169,6 +1408,27 @@
           "__init__(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "x", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "bla", 
+            "A"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 
@@ -1224,6 +1484,10 @@
         {
           "frame_id": 1, 
           "encoded_locals": {
+            "__return__": [
+              "REF", 
+              2
+            ], 
             "x": [
               "REF", 
               3
@@ -1243,7 +1507,8 @@
           "ordered_varnames": [
             "__init__", 
             "bla", 
-            "x"
+            "x", 
+            "__return__"
           ]
         }
       ], 
@@ -1263,6 +1528,27 @@
           "__init__(self)", 
           1
         ], 
+        "2": [
+          "DICT", 
+          [
+            "x", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "bla", 
+            "A"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              1
+            ]
+          ]
+        ], 
         "3": [
           "FUNCTION", 
           "x(self)", 

From 8cfa9bf7eeea3176ac57a65229cfe86a7641d9dd Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 9 Sep 2012 23:45:42 -0700
Subject: [PATCH 264/502] color tweak

---
 v3/css/pytutor.css | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index c70bbd2ea..499569ad9 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -378,7 +378,9 @@ div.ExecutionVisualizer div.zombieStackFrame {
 }
 
 div.ExecutionVisualizer div.highlightedStackFrame {
-  background-color: #c5dfea;
+  background-color: #d7e7fb;
+  /*background-color: #c0daf8;*/
+  /*background-color: #9eeaff #c5dfea;*/
 }
 
 div.ExecutionVisualizer div.stackFrame,

From 8d81aefa821fe682114f5aaa982818948a19fa92 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 10 Sep 2012 00:33:06 -0700
Subject: [PATCH 265/502] nice color makeover

---
 v3/css/opt-frontend.css |  2 +-
 v3/css/pytutor.css      |  2 +-
 v3/js/pytutor.js        | 36 +++++++++++++++++++-----------------
 3 files changed, 21 insertions(+), 19 deletions(-)

diff --git a/v3/css/opt-frontend.css b/v3/css/opt-frontend.css
index ae30640c8..bb02dace3 100644
--- a/v3/css/opt-frontend.css
+++ b/v3/css/opt-frontend.css
@@ -82,4 +82,4 @@ button.bigBtn {
 
 
 /* necessary for CodeMirror error line highlighting to work! */
-.CodeMirror .errorLine { background: #F89D99 !important; }
+.CodeMirror .errorLine { background: #ffff3f !important; }
diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 499569ad9..b538abadf 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -201,7 +201,7 @@ div.ExecutionVisualizer .funcObj {
 
 div.ExecutionVisualizer .retval {
   font-size: 9pt;
-  color: #d03939; /* dark red */
+  color: #e93f34; /* should match brightRed JavaScript variable */
 }
 
 
diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index b5f8e36ec..bcea2aefd 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -470,7 +470,6 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
   //   'text' - the text of the line of code
   //   'lineNumber' - one-indexed (always the array index + 1)
   //   'executionPoints' - an ordered array of zero-indexed execution points where this line was executed
-  //   'backgroundColor' - current code output line background color
   //   'breakpointHere' - has a breakpoint been set here?
   this.codeOutputLines = [];
 
@@ -609,7 +608,6 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
     n.text = cod;
     n.lineNumber = i + 1;
     n.executionPoints = [];
-    n.backgroundColor = null;
     n.breakpointHere = false;
 
     $.each(this.curTrace, function(j, elt) {
@@ -869,7 +867,7 @@ ExecutionVisualizer.prototype.updateOutput = function() {
 
 
     // edge case for the final instruction :0
-    if (isTerminated) {
+    if (isTerminated && !hasError) {
       // don't show redundant arrows on the same line when terminated ...
       if (prevLineNumber == curLineNumber) {
         curLineNumber = null;
@@ -902,18 +900,24 @@ ExecutionVisualizer.prototype.updateOutput = function() {
 
 
     myViz.domRootD3.selectAll('#pyCodeOutputDiv td.cod')
-      .style('background-color', function(d) {
+      .style('border-top', function(d) {
         if (hasError && (d.lineNumber == curEntry.line)) {
-          d.backgroundColor = errorColor;
+          return '1px solid ' + errorColor;
         }
         else {
-          d.backgroundColor = null;
+          return '';
+        }
+      })
+      .style('border-bottom', function(d) {
+        // COPY AND PASTE ALERT!
+        if (hasError && (d.lineNumber == curEntry.line)) {
+          return '1px solid ' + errorColor;
+        }
+        else {
+          return '';
         }
-
-        return d.backgroundColor;
       });
 
-
     // returns True iff lineNo is visible in pyCodeOutputDiv
     function isOutputLineVisible(lineNo) {
       var lineNoTd = myViz.domRoot.find('#lineNo' + lineNo);
@@ -2010,23 +2014,21 @@ var highlightedLineLighterColor = '#e8fff0';
 
 var funcCallLineColor = '#a2eebd';
 
-var darkRed = '#d03939';
+var brightRed = '#e93f34';
 
 var connectorBaseColor = '#005583';
-var connectorHighlightColor = darkRed;
+var connectorHighlightColor = brightRed;
 var connectorInactiveColor = '#cccccc';
 
-var errorColor = darkRed;
+var errorColor = brightRed;
 
-var breakpointColor = darkRed;
+var breakpointColor = brightRed;
 var hoverBreakpointColor = connectorBaseColor;
 
 
 // Unicode arrow types: '\u21d2', '\u21f0', '\u2907'
-var darkArrowColor = darkRed;
-var lightArrowColor = '#ccc';
-
-var arrowHTML = '\u21d2';
+var darkArrowColor = brightRed;
+var lightArrowColor = '#c9e6ca';
 
 
 function assert(cond) {

From 070886bbe9f1ca28d2b05824bf85cd91fd3e2925 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 10 Sep 2012 00:35:09 -0700
Subject: [PATCH 266/502] minor

---
 v3/css/pytutor.css | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index b538abadf..957bc4acf 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -385,7 +385,7 @@ div.ExecutionVisualizer div.highlightedStackFrame {
 
 div.ExecutionVisualizer div.stackFrame,
 div.ExecutionVisualizer div.highlightedStackFrame {
-  border-left: 2px solid #a6b3b6;
+  border-left: 1px solid #a6b3b6;
 }
 
 

From aa77386fe5192549180ea0c92dff52f44e5b51de Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 10 Sep 2012 00:40:19 -0700
Subject: [PATCH 267/502] tiny

---
 v3/js/pytutor.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index bcea2aefd..d8ca7c927 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -753,7 +753,7 @@ ExecutionVisualizer.prototype.updateOutput = function() {
     gutterSVG.height(gutterSVG.parent().height());
   }
 
-  var tableTop = 6; // manually adjust this so that it looks good :)
+  var tableTop = 5; // manually adjust this so that it looks good :)
 
   // this weird contortion is necessary to get the accurate row height on Internet Explorer
   // (simpler methods work on all other major browsers, erghhhhhh!!!)

From a487d9873d614bcba6da07936d443ff84ffc2cf7 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 10 Sep 2012 09:01:39 -0700
Subject: [PATCH 268/502] scroll to top on certain actions to make frontend UI
 more usable

---
 v3/js/opt-frontend.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 7171d347e..f278aee77 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -58,6 +58,9 @@ var pyInputCodeMirror; // CodeMirror object that contains the input text
 function setCodeMirrorVal(dat) {
   pyInputCodeMirror.setValue(dat.rtrim() /* kill trailing spaces */);
   $('#urlOutput').val('');
+
+  // also scroll to top to make the UI more usable on smaller monitors
+  $('body').scrollTop(0);
 }
 
 
@@ -255,6 +258,9 @@ $(document).ready(function() {
               });
 
 
+              // also scroll to top to make the UI more usable on smaller monitors
+              $('body').scrollTop(0);
+
               $.bbq.pushState({ mode: 'visualize' }, 2 /* completely override other hash strings to keep URL clean */);
             }
           },

From 417c0016eaae74c0c96fbcfd72dfc5d24992b62c Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 10 Sep 2012 09:16:17 -0700
Subject: [PATCH 269/502] teeny

---
 v3/embedding-examples.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/v3/embedding-examples.js b/v3/embedding-examples.js
index d03022cd8..a80fb5fb4 100644
--- a/v3/embedding-examples.js
+++ b/v3/embedding-examples.js
@@ -17,9 +17,9 @@ var aliasing5Viz = null;
 var hanoiViz = null;
 
 $(document).ready(function() {
-  stuffViz = new ExecutionVisualizer('stuffDiv', stuff, {hideOutput: true, jumpToEnd: true, editCodeBaseURL: 'http://localhost:8080/'});
-  aliasing5Viz = new ExecutionVisualizer('aliasing5Div', aliasing5, {hideOutput: true, jumpToEnd: true, editCodeBaseURL: 'http://localhost:8080/'});
-  hanoiViz = new ExecutionVisualizer('hanoiDiv', hanoi, {startingInstruction: 45, hideOutput: true, editCodeBaseURL: 'http://localhost:8080/'});
+  stuffViz = new ExecutionVisualizer('stuffDiv', stuff, {embeddedMode: true, jumpToEnd: true, editCodeBaseURL: 'http://localhost:8080/'});
+  aliasing5Viz = new ExecutionVisualizer('aliasing5Div', aliasing5, {embeddedMode: true, jumpToEnd: true, editCodeBaseURL: 'http://localhost:8080/'});
+  hanoiViz = new ExecutionVisualizer('hanoiDiv', hanoi, {startingInstruction: 45, embeddedMode: true, editCodeBaseURL: 'http://localhost:8080/'});
 
   // redraw connector arrows on window resize
   $(window).resize(function() {

From 3b3f085bc1133cea592de3d14ac91d9b27aa15c9 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 10 Sep 2012 09:31:53 -0700
Subject: [PATCH 270/502] minor css cleanups

---
 v3/css/pytutor.css | 32 ++------------------------------
 1 file changed, 2 insertions(+), 30 deletions(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 957bc4acf..364c79822 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -48,30 +48,6 @@ div.ExecutionVisualizer #dataViz {
   margin-left: 30px;
 }
 
-div.ExecutionVisualizer table.frameDataViz {
-  border-spacing: 0px;
-  font-size: 12pt;
-  margin-top: 5px;
-  margin-left: 15px;
-  background-color: #dddddd;
-  padding: 5px;
-}
-
-div.ExecutionVisualizer table.frameDataViz td.varname {
-  text-align: right;
-  padding: 5px;
-  padding-right: 8px;
-  border-right: 1px dashed #888888;
-}
-
-div.ExecutionVisualizer table.frameDataViz td.val {
-  padding-left: 8px;
-  padding-right: 5px;
-
-  padding-top: 8px;
-  padding-bottom: 8px;
-}
-
 div.ExecutionVisualizer div#pyCodeOutputDiv {
   max-width: 550px;
   max-height: 450px;
@@ -146,8 +122,7 @@ div.ExecutionVisualizer div#editCodeLinkDiv {
 }
 
 div.ExecutionVisualizer #errorOutput {
-  color: #d03939;
-  /*background-color: #F87D76;*/
+  color: #e93f34; /* should match brightRed JavaScript variable */
   font-size: 12pt;
   padding: 2px;
   line-height: 1.5em;
@@ -157,10 +132,6 @@ div.ExecutionVisualizer #errorOutput {
 /* VCR control buttons for stepping through execution */
 
 div.ExecutionVisualizer #vcrControls {
-  /*
-  margin-top: 15px;
-  margin-bottom: 15px;
-  */
   margin: 15px auto;
   width: 100%;
   text-align: center;
@@ -379,6 +350,7 @@ div.ExecutionVisualizer div.zombieStackFrame {
 
 div.ExecutionVisualizer div.highlightedStackFrame {
   background-color: #d7e7fb;
+
   /*background-color: #c0daf8;*/
   /*background-color: #9eeaff #c5dfea;*/
 }

From 84c04b8151615b613a44eee3658d94c982d64096 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 10 Sep 2012 11:02:13 -0700
Subject: [PATCH 271/502] left margin arrows work on Firefox 15 now

---
 v3/js/pytutor.js | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index d8ca7c927..77e1891ca 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -747,11 +747,10 @@ ExecutionVisualizer.prototype.updateOutput = function() {
 
   // set the gutter's height to match that of its parent
   // (we often can't do this earlier since the entire pane
-  //  might be invisible and hence return a height of zero)
+  //  might be invisible and hence returns a height of zero or NaN -- the exact format depends on browser)
   var gutterSVG = myViz.domRoot.find('svg#leftCodeGutterSVG');
-  if (!gutterSVG.height()) {
-    gutterSVG.height(gutterSVG.parent().height());
-  }
+  gutterSVG.height(gutterSVG.parent().height());
+
 
   var tableTop = 5; // manually adjust this so that it looks good :)
 

From b75d0eb2b39ab05342d705fe26b3a88c36a1f990 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 10 Sep 2012 11:21:02 -0700
Subject: [PATCH 272/502] minor tweak

---
 v3/js/opt-frontend.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index f278aee77..5d09c2bfa 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -60,7 +60,7 @@ function setCodeMirrorVal(dat) {
   $('#urlOutput').val('');
 
   // also scroll to top to make the UI more usable on smaller monitors
-  $('body').scrollTop(0);
+  $('html').scrollTop(0);
 }
 
 
@@ -259,7 +259,7 @@ $(document).ready(function() {
 
 
               // also scroll to top to make the UI more usable on smaller monitors
-              $('body').scrollTop(0);
+              $('html').scrollTop(0);
 
               $.bbq.pushState({ mode: 'visualize' }, 2 /* completely override other hash strings to keep URL clean */);
             }

From 92f72a2b753f727343bca54abca972c1caa2564f Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 10 Sep 2012 14:50:01 -0700
Subject: [PATCH 273/502] eliminate magic numbers in aligning arrows, so that
 it now works on different browsers

---
 v3/js/pytutor.js | 81 ++++++++++++++++++++++++++++++++----------------
 1 file changed, 55 insertions(+), 26 deletions(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 77e1891ca..913507931 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -55,7 +55,8 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
 
-var svgArrowPolygon = '0,3 12,3 12,0 18,5 12,10 12,7 0,7';
+var SVG_ARROW_POLYGON = '0,3 12,3 12,0 18,5 12,10 12,7 0,7';
+var SVG_ARROW_HEIGHT = 10; // must match height of SVG_ARROW_POLYGON
 
 var curVisualizerID = 1; // global to uniquely identify each ExecutionVisualizer instance
 
@@ -94,6 +95,11 @@ function ExecutionVisualizer(domRootID, dat, params) {
   curVisualizerID++;
 
 
+  this.leftGutterSvgInitialized = false;
+  this.arrowOffsetY = undefined;
+  this.codeRowHeight = undefined;
+
+
   // cool, we can create a separate jsPlumb instance for each visualization:
   this.jsPlumbInstance = jsPlumb.getInstance({
     Endpoint: ["Dot", {radius:3}],
@@ -219,12 +225,12 @@ ExecutionVisualizer.prototype.render = function() {
 
   myViz.domRootD3.select('svg#prevLegendArrowSVG')
     .append('polygon')
-    .attr('points', svgArrowPolygon)
+    .attr('points', SVG_ARROW_POLYGON)
     .attr('fill', lightArrowColor);
 
   myViz.domRootD3.select('svg#curLegendArrowSVG')
     .append('polygon')
-    .attr('points', svgArrowPolygon)
+    .attr('points', SVG_ARROW_POLYGON)
     .attr('fill', darkArrowColor);
 
 
@@ -679,13 +685,13 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
   myViz.domRootD3.select('svg#leftCodeGutterSVG')
     .append('polygon')
     .attr('id', 'prevLineArrow')
-    .attr('points', svgArrowPolygon)
+    .attr('points', SVG_ARROW_POLYGON)
     .attr('fill', 'white');
 
   myViz.domRootD3.select('svg#leftCodeGutterSVG')
     .append('polygon')
     .attr('id', 'curLineArrow')
-    .attr('points', svgArrowPolygon)
+    .attr('points', SVG_ARROW_POLYGON)
     .attr('fill', 'white');
 
 
@@ -736,35 +742,58 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
 
 // This function is called every time the display needs to be updated
 ExecutionVisualizer.prototype.updateOutput = function() {
-  var myViz = this; // to prevent confusion of 'this' inside of nested functions
-
   assert(this.curTrace);
 
+  var myViz = this; // to prevent confusion of 'this' inside of nested functions
+
   // there's no point in re-rendering if this pane isn't even visible in the first place!
   if (!myViz.domRoot.is(':visible')) {
     return;
   }
 
-  // set the gutter's height to match that of its parent
-  // (we often can't do this earlier since the entire pane
-  //  might be invisible and hence returns a height of zero or NaN -- the exact format depends on browser)
+
   var gutterSVG = myViz.domRoot.find('svg#leftCodeGutterSVG');
-  gutterSVG.height(gutterSVG.parent().height());
 
+  // one-time initialization of the left gutter
+  // (we often can't do this earlier since the entire pane
+  //  might be invisible and hence returns a height of zero or NaN
+  //  -- the exact format depends on browser)
+  if (!myViz.leftGutterSvgInitialized) {
+    // set the gutter's height to match that of its parent
+    gutterSVG.height(gutterSVG.parent().height());
 
-  var tableTop = 5; // manually adjust this so that it looks good :)
+    var firstRowOffsetY  = myViz.domRoot.find('table#pyCodeOutput tr:first').offset().top;
+    
+    // first take care of edge case when there's only one line ...
+    myViz.codeRowHeight = myViz.domRoot.find('table#pyCodeOutput td.cod:first').height();
+
+    // ... then handle the (much more common) multi-line case ...
+    // this weird contortion is necessary to get the accurate row height on Internet Explorer
+    // (simpler methods work on all other major browsers, erghhhhhh!!!)
+    if (this.codeOutputLines && this.codeOutputLines.length > 1) {
+      var secondRowOffsetY = myViz.domRoot.find('table#pyCodeOutput tr:nth-child(2)').offset().top;
+      myViz.codeRowHeight = secondRowOffsetY - firstRowOffsetY;
+    }
 
-  // this weird contortion is necessary to get the accurate row height on Internet Explorer
-  // (simpler methods work on all other major browsers, erghhhhhh!!!)
-  
-  // first take care of edge case when there's only one line ...
-  var rowHeight = myViz.domRoot.find('table#pyCodeOutput td.cod:first').height();
-  // ... then handle the (much more common) multi-line case ...
-  if (this.codeOutputLines && this.codeOutputLines.length > 1) {
-    rowHeight = (myViz.domRoot.find('table#pyCodeOutput tr:nth-child(2)').offset().top - 
-                 myViz.domRoot.find('table#pyCodeOutput tr:first').offset().top);
+    assert(myViz.codeRowHeight > 0);
+
+    var gutterOffsetY = gutterSVG.offset().top;
+    var teenyAdjustment = gutterOffsetY - firstRowOffsetY;
+
+    // super-picky detail to adjust the vertical alignment of arrows so that they line up
+    // well with the pointed-to code text ...
+    // (if you want to manually adjust tableTop, then ~5 is a reasonable number)
+    myViz.arrowOffsetY = Math.floor((myViz.codeRowHeight / 2) - (SVG_ARROW_HEIGHT / 2)) - teenyAdjustment;
+
+    myViz.leftGutterSvgInitialized = true;
+
+    console.log(myViz.codeRowHeight);
   }
 
+  assert(myViz.arrowOffsetY !== undefined);
+  assert(myViz.codeRowHeight !== undefined);
+  assert(0 <= myViz.arrowOffsetY && myViz.arrowOffsetY <= myViz.codeRowHeight);
+
   // call the callback if necessary (BEFORE rendering)
   if (this.params.updateOutputCallback) {
     this.params.updateOutputCallback(this);
@@ -861,8 +890,8 @@ ExecutionVisualizer.prototype.updateOutput = function() {
 
     // on 'return' events, give a bit more of a vertical nudge to show that
     // the arrow is aligned with the 'bottom' of the line ...
-    var prevVerticalNudge = prevIsReturn ? 10 : 0;
-    var curVerticalNudge = curIsReturn ? 10 : 0;
+    var prevVerticalNudge = prevIsReturn ? Math.floor(myViz.codeRowHeight / 2) : 0;
+    var curVerticalNudge  = curIsReturn  ? Math.floor(myViz.codeRowHeight / 2) : 0;
 
 
     // edge case for the final instruction :0
@@ -873,7 +902,7 @@ ExecutionVisualizer.prototype.updateOutput = function() {
       }
       // otherwise have a smaller vertical nudge (to fit at bottom of display table)
       else {
-        curVerticalNudge = 8;
+        curVerticalNudge = curVerticalNudge - 2;
       }
     }
 
@@ -881,7 +910,7 @@ ExecutionVisualizer.prototype.updateOutput = function() {
       gutterSVG.find('#prevLineArrow')
         .show()
         .attr('fill', lightArrowColor)
-        .attr('transform', 'translate(0, ' + (((prevLineNumber - 1) * rowHeight) + tableTop + prevVerticalNudge) + ')');
+        .attr('transform', 'translate(0, ' + (((prevLineNumber - 1) * myViz.codeRowHeight) + myViz.arrowOffsetY + prevVerticalNudge) + ')');
     }
     else {
       gutterSVG.find('#prevLineArrow').hide();
@@ -891,7 +920,7 @@ ExecutionVisualizer.prototype.updateOutput = function() {
       gutterSVG.find('#curLineArrow')
         .show()
         .attr('fill', darkArrowColor)
-        .attr('transform', 'translate(0, ' + (((curLineNumber - 1) * rowHeight) + tableTop + curVerticalNudge) + ')');
+        .attr('transform', 'translate(0, ' + (((curLineNumber - 1) * myViz.codeRowHeight) + myViz.arrowOffsetY + curVerticalNudge) + ')');
     }
     else {
       gutterSVG.find('#curLineArrow').hide();

From 15eee3d0f9474ca73f5b6f287b19d257af73cd19 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 10 Sep 2012 14:50:26 -0700
Subject: [PATCH 274/502] tiny

---
 v3/tutor.html | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/tutor.html b/v3/tutor.html
index 1a463b480..607ebfb61 100644
--- a/v3/tutor.html
+++ b/v3/tutor.html
@@ -164,7 +164,7 @@
 

From b8c6700b4b5de6f4a163418a705221cb8fb24874 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 10 Sep 2012 15:10:24 -0700
Subject: [PATCH 278/502] tiny

---
 v3/example-code/nonlocal.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/v3/example-code/nonlocal.txt b/v3/example-code/nonlocal.txt
index c52db1f09..4bd156762 100644
--- a/v3/example-code/nonlocal.txt
+++ b/v3/example-code/nonlocal.txt
@@ -4,7 +4,8 @@ def outer():
     def inner():
         nonlocal x
         x = 2
-        print("inner:", x)
+        y = x
+        print("inner:", x, y)
     inner()
     print("outer:", x)
 

From d17ac78cff52c44a320b7e10b286a35406c13560 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 10 Sep 2012 15:45:57 -0700
Subject: [PATCH 279/502] added simple animation for left gutter arrows

---
 v3/js/pytutor.js | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 913507931..ab2cfa0f1 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -681,18 +681,18 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
   myViz.domRoot.find('#pyCodeOutput tr:first')
     .prepend('');
 
-  // create prevLineArrow and curLineArrow, but don't fill them in with colors just yet ...
+  // create prevLineArrow and curLineArrow
   myViz.domRootD3.select('svg#leftCodeGutterSVG')
     .append('polygon')
     .attr('id', 'prevLineArrow')
     .attr('points', SVG_ARROW_POLYGON)
-    .attr('fill', 'white');
+    .attr('fill', lightArrowColor);
 
   myViz.domRootD3.select('svg#leftCodeGutterSVG')
     .append('polygon')
     .attr('id', 'curLineArrow')
     .attr('points', SVG_ARROW_POLYGON)
-    .attr('fill', 'white');
+    .attr('fill', darkArrowColor);
 
 
   // 2012-09-05: Disable breakpoints for now to simplify UX
@@ -786,8 +786,6 @@ ExecutionVisualizer.prototype.updateOutput = function() {
     myViz.arrowOffsetY = Math.floor((myViz.codeRowHeight / 2) - (SVG_ARROW_HEIGHT / 2)) - teenyAdjustment;
 
     myViz.leftGutterSvgInitialized = true;
-
-    console.log(myViz.codeRowHeight);
   }
 
   assert(myViz.arrowOffsetY !== undefined);
@@ -907,9 +905,11 @@ ExecutionVisualizer.prototype.updateOutput = function() {
     }
 
     if (prevLineNumber) {
-      gutterSVG.find('#prevLineArrow')
-        .show()
-        .attr('fill', lightArrowColor)
+      gutterSVG.find('#prevLineArrow').show();
+
+      myViz.domRootD3.select('#prevLineArrow')
+        .transition()
+        .duration(300)
         .attr('transform', 'translate(0, ' + (((prevLineNumber - 1) * myViz.codeRowHeight) + myViz.arrowOffsetY + prevVerticalNudge) + ')');
     }
     else {
@@ -917,9 +917,11 @@ ExecutionVisualizer.prototype.updateOutput = function() {
     }
 
     if (curLineNumber) {
-      gutterSVG.find('#curLineArrow')
-        .show()
-        .attr('fill', darkArrowColor)
+      gutterSVG.find('#curLineArrow').show();
+
+      myViz.domRootD3.select('#curLineArrow')
+        .transition()
+        .duration(300)
         .attr('transform', 'translate(0, ' + (((curLineNumber - 1) * myViz.codeRowHeight) + myViz.arrowOffsetY + curVerticalNudge) + ')');
     }
     else {

From e443ad4891c572610a93f3793ba90677bd16d2ff Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 10 Sep 2012 16:16:44 -0700
Subject: [PATCH 280/502] make smooth transitions optional, only when pressing
 "Forward >" button

---
 v3/js/pytutor.js | 48 ++++++++++++++++++++++++++++++++++++------------
 1 file changed, 36 insertions(+), 12 deletions(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index ab2cfa0f1..37b735eee 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -432,7 +432,7 @@ ExecutionVisualizer.prototype.stepForward = function() {
     else {
       myViz.curInstr += 1;
     }
-    myViz.updateOutput();
+    myViz.updateOutput(true);
     return true;
   }
 
@@ -741,7 +741,8 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
 
 
 // This function is called every time the display needs to be updated
-ExecutionVisualizer.prototype.updateOutput = function() {
+// smoothTransition is OPTIONAL!
+ExecutionVisualizer.prototype.updateOutput = function(smoothTransition) {
   assert(this.curTrace);
 
   var myViz = this; // to prevent confusion of 'this' inside of nested functions
@@ -905,24 +906,47 @@ ExecutionVisualizer.prototype.updateOutput = function() {
     }
 
     if (prevLineNumber) {
-      gutterSVG.find('#prevLineArrow').show();
+      var pla = myViz.domRootD3.select('#prevLineArrow');
+      var translatePrevCmd = 'translate(0, ' + (((prevLineNumber - 1) * myViz.codeRowHeight) + myViz.arrowOffsetY + prevVerticalNudge) + ')';
+
+      if (smoothTransition) {
+        pla 
+          .transition()
+          .duration(200)
+          .attr('fill', 'white')
+          .each('end', function() {
+            pla
+              .attr('transform', translatePrevCmd)
+              .attr('fill', lightArrowColor);
+
+          });
+      }
+      else {
+        pla.attr('transform', translatePrevCmd)
+      }
 
-      myViz.domRootD3.select('#prevLineArrow')
-        .transition()
-        .duration(300)
-        .attr('transform', 'translate(0, ' + (((prevLineNumber - 1) * myViz.codeRowHeight) + myViz.arrowOffsetY + prevVerticalNudge) + ')');
+      gutterSVG.find('#prevLineArrow').show();
     }
     else {
       gutterSVG.find('#prevLineArrow').hide();
     }
 
     if (curLineNumber) {
-      gutterSVG.find('#curLineArrow').show();
+      var cla = myViz.domRootD3.select('#curLineArrow');
+      var translateCurCmd = 'translate(0, ' + (((curLineNumber - 1) * myViz.codeRowHeight) + myViz.arrowOffsetY + curVerticalNudge) + ')';
 
-      myViz.domRootD3.select('#curLineArrow')
-        .transition()
-        .duration(300)
-        .attr('transform', 'translate(0, ' + (((curLineNumber - 1) * myViz.codeRowHeight) + myViz.arrowOffsetY + curVerticalNudge) + ')');
+      if (smoothTransition) {
+        cla 
+          .transition()
+          .delay(200)
+          .duration(300)
+          .attr('transform', translateCurCmd);
+      }
+      else {
+        cla.attr('transform', translateCurCmd);
+      }
+
+      gutterSVG.find('#curLineArrow').show();
     }
     else {
       gutterSVG.find('#curLineArrow').hide();

From 34f108e11e8666c6dc313a1308ebf30ca7f298fd Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 10 Sep 2012 16:23:05 -0700
Subject: [PATCH 281/502] teeny

---
 v3/js/pytutor.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 37b735eee..5f9db48ae 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -919,13 +919,14 @@ ExecutionVisualizer.prototype.updateOutput = function(smoothTransition) {
               .attr('transform', translatePrevCmd)
               .attr('fill', lightArrowColor);
 
+            gutterSVG.find('#prevLineArrow').show(); // show at the end to avoid flickering
           });
       }
       else {
         pla.attr('transform', translatePrevCmd)
+        gutterSVG.find('#prevLineArrow').show();
       }
 
-      gutterSVG.find('#prevLineArrow').show();
     }
     else {
       gutterSVG.find('#prevLineArrow').hide();

From 9eb2789e14c088a3b33a79dd0e5f3c2b9e9d452d Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 10 Sep 2012 16:27:04 -0700
Subject: [PATCH 282/502] minor

---
 v3/js/pytutor.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 5f9db48ae..a7990285d 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -940,7 +940,7 @@ ExecutionVisualizer.prototype.updateOutput = function(smoothTransition) {
         cla 
           .transition()
           .delay(200)
-          .duration(300)
+          .duration(250)
           .attr('transform', translateCurCmd);
       }
       else {

From 44abc87d265274dc9204d9a26ebe42c4e801e96d Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 10 Sep 2012 22:41:45 -0700
Subject: [PATCH 283/502] added beginnings of demo site

---
 v3/css/pytutor-title.css |  91 ++++++++++++++
 v3/index.html            | 199 +++++++++++++++++++++++++++++++
 v3/js/jquery.corner.js   | 249 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 539 insertions(+)
 create mode 100644 v3/css/pytutor-title.css
 create mode 100644 v3/index.html
 create mode 100644 v3/js/jquery.corner.js

diff --git a/v3/css/pytutor-title.css b/v3/css/pytutor-title.css
new file mode 100644
index 000000000..3a4cd2005
--- /dev/null
+++ b/v3/css/pytutor-title.css
@@ -0,0 +1,91 @@
+/* CSS accompanying ../index.html */
+
+body {
+  background-color: white;
+
+  line-height: 1.5;  /* slightly more than single spacing, for prose text */
+  font-family: Georgia, Palatino, Times, serif;
+
+  font-size: 12pt;
+  max-width: 900px;
+  margin-left: auto;
+  margin-right: auto;
+}
+
+
+h1 {
+  font-weight: normal;
+  font-size: 20pt;
+  line-height: 1em;  /* enforce single spacing so that Georgia works */
+
+  margin-top: 0px;
+  margin-bottom: 8px;
+}
+
+h2 {
+  font-size: 12pt;
+  font-weight: normal;
+
+  margin-top: 2px;
+  margin-bottom: 20px;
+}
+
+.titlePane {
+  margin-left: auto;
+  margin-right: auto;
+  margin-bottom: 25px;
+  text-align: center;
+}
+
+.titlePane h2 {
+  margin-top: 8px;
+}
+
+div.mainBodyPane {
+  width: 100%;
+  margin-left: auto;
+  margin-right: auto;
+}
+
+div.activityPane {
+  /* TOP RIGHT BOTTOM LEFT */
+  padding: 15px 20px 5px 20px;
+  margin-top: 30px;
+  text-align: left;
+  border: 3px solid #005583;
+}
+
+
+ul {
+  padding-left: 18px;
+}
+
+li {
+  margin-bottom: 6px;
+  font-size: 11pt;
+}
+
+a,
+a:visited,
+a:hover {
+  color: #3D58A2;
+}
+
+#footer {
+  color: #666666;
+  font-size: 9pt;
+  border-top: 1px solid #bbbbbb;
+  padding-top: 5px;
+  margin-top: 15px;
+
+  max-width: 100%;
+  /* center align */
+  margin-left: auto;
+  margin-right: auto;
+
+  font-family: verdana, arial, helvetica, sans-serif;
+}
+
+
+/* necessary for CodeMirror error line highlighting to work! */
+.CodeMirror .errorLine { background: #ffff3f !important; }
diff --git a/v3/index.html b/v3/index.html
new file mode 100644
index 000000000..04781cdd3
--- /dev/null
+++ b/v3/index.html
@@ -0,0 +1,199 @@
+
+
+
+
+
+
+
+
+
+Online Python Tutor: Learn and practice Python programming in your web browser
+
+
+
+
+
+ 
+ 
+ 
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

+
+
Online Python Tutor

+
Learn and practice Python programming in your web browser

+
+

+
+

+
+

+
+
Learn

+
Python by writing code and visualizing execution

+
+
This free educational application allows teachers and students to
+write Python scripts directly in the web browser, execute those scripts,
+single-step forwards and backwards through execution, and view
+the run-time state of all data structures.

+
+
Rather than displaying a bland text-based console, the Online Python
+Tutor provides a rich visualization of variables, heap objects, and
+stack frames.  For example, the following code:

+
+
+x = ["Alice", "Bob", "Charlie"]
+y = x
+z = ["Alice", "Bob", "Charlie"]
+

+
+
will be visualized as the following HTML diagram, which properly shows
+aliasing relationships:

+
+
+
Go play with the Online Python Tutor!

+
+

+
+

+
+
Solve

+
programming problems by writing Python code

+
+
The Online Python Tutor also allows students to practice solving
+programming problems like those they would receive for class assignments
+or technical job interviews.

+
+
It provides web-based interfaces for writing solution and test code,
+executing on a series of graded test inputs, and showing what tests
+passed and failed.

+
+
The above screenshot shows passed and failed tests.  The user can
+click on the "Debug me" button besides one of the sad faces to debug why
+the program failed on a particular test.

+
+
Here are some sample practice problems:

+
+
+
+

+
+

+
+
Debug

+
existing programs that almost work properly

+
+
Using the Online Python Tutor's bidirectional single-stepping and
+data structure visualization capabilities, students can practice
+debugging, an important skill which is rarely covered in web-based
+programming problems.

+
+
They can work on problems like, "Change at most 2 lines of code to
+make this almost-correct Python program work properly." Here are
+some sample debugging problems:

+
+
+
+

+
+

+
+
+
+
+
+
+
diff --git a/v3/js/jquery.corner.js b/v3/js/jquery.corner.js
new file mode 100644
index 000000000..c416613fd
--- /dev/null
+++ b/v3/js/jquery.corner.js
@@ -0,0 +1,249 @@
+/*!
+ * jQuery corner plugin: simple corner rounding
+ * Examples and documentation at: http://jquery.malsup.com/corner/
+ * version 2.12 (23-MAY-2011)
+ * Requires jQuery v1.3.2 or later
+ * Dual licensed under the MIT and GPL licenses:
+ * http://www.opensource.org/licenses/mit-license.php
+ * http://www.gnu.org/licenses/gpl.html
+ * Authors: Dave Methvin and Mike Alsup
+ */
+
+/**
+ *  corner() takes a single string argument:  $('#myDiv').corner("effect corners width")
+ *
+ *  effect:  name of the effect to apply, such as round, bevel, notch, bite, etc (default is round). 
+ *  corners: one or more of: top, bottom, tr, tl, br, or bl.  (default is all corners)
+ *  width:   width of the effect; in the case of rounded corners this is the radius. 
+ *           specify this value using the px suffix such as 10px (yes, it must be pixels).
+ */
+;(function($) { 
+
+var style = document.createElement('div').style,
+    moz = style['MozBorderRadius'] !== undefined,
+    webkit = style['WebkitBorderRadius'] !== undefined,
+    radius = style['borderRadius'] !== undefined || style['BorderRadius'] !== undefined,
+    mode = document.documentMode || 0,
+    noBottomFold = $.browser.msie && (($.browser.version < 8 && !mode) || mode < 8),
+
+    expr = $.browser.msie && (function() {
+        var div = document.createElement('div');
+        try { div.style.setExpression('width','0+0'); div.style.removeExpression('width'); }
+        catch(e) { return false; }
+        return true;
+    })();
+
+$.support = $.support || {};
+$.support.borderRadius = moz || webkit || radius; // so you can do:  if (!$.support.borderRadius) $('#myDiv').corner();
+
+function sz(el, p) { 
+    return parseInt($.css(el,p))||0; 
+};
+function hex2(s) {
+    s = parseInt(s).toString(16);
+    return ( s.length < 2 ) ? '0'+s : s;
+};
+function gpc(node) {
+    while(node) {
+        var v = $.css(node,'backgroundColor'), rgb;
+        if (v && v != 'transparent' && v != 'rgba(0, 0, 0, 0)') {
+            if (v.indexOf('rgb') >= 0) { 
+                rgb = v.match(/\d+/g); 
+                return '#'+ hex2(rgb[0]) + hex2(rgb[1]) + hex2(rgb[2]);
+            }
+            return v;
+        }
+        if (node.nodeName.toLowerCase() == 'html')
+            break;
+        node = node.parentNode; // keep walking if transparent
+    }
+    return '#ffffff';
+};
+
+function getWidth(fx, i, width) {
+    switch(fx) {
+    case 'round':  return Math.round(width*(1-Math.cos(Math.asin(i/width))));
+    case 'cool':   return Math.round(width*(1+Math.cos(Math.asin(i/width))));
+    case 'sharp':  return width-i;
+    case 'bite':   return Math.round(width*(Math.cos(Math.asin((width-i-1)/width))));
+    case 'slide':  return Math.round(width*(Math.atan2(i,width/i)));
+    case 'jut':    return Math.round(width*(Math.atan2(width,(width-i-1))));
+    case 'curl':   return Math.round(width*(Math.atan(i)));
+    case 'tear':   return Math.round(width*(Math.cos(i)));
+    case 'wicked': return Math.round(width*(Math.tan(i)));
+    case 'long':   return Math.round(width*(Math.sqrt(i)));
+    case 'sculpt': return Math.round(width*(Math.log((width-i-1),width)));
+    case 'dogfold':
+    case 'dog':    return (i&1) ? (i+1) : width;
+    case 'dog2':   return (i&2) ? (i+1) : width;
+    case 'dog3':   return (i&3) ? (i+1) : width;
+    case 'fray':   return (i%2)*width;
+    case 'notch':  return width; 
+    case 'bevelfold':
+    case 'bevel':  return i+1;
+    case 'steep':  return i/2 + 1;
+    case 'invsteep':return (width-i)/2+1;
+    }
+};
+
+$.fn.corner = function(options) {
+    // in 1.3+ we can fix mistakes with the ready state
+    if (this.length == 0) {
+        if (!$.isReady && this.selector) {
+            var s = this.selector, c = this.context;
+            $(function() {
+                $(s,c).corner(options);
+            });
+        }
+        return this;
+    }
+
+    return this.each(function(index){
+        var $this = $(this),
+            // meta values override options
+            o = [$this.attr($.fn.corner.defaults.metaAttr) || '', options || ''].join(' ').toLowerCase(),
+            keep = /keep/.test(o),                       // keep borders?
+            cc = ((o.match(/cc:(#[0-9a-f]+)/)||[])[1]),  // corner color
+            sc = ((o.match(/sc:(#[0-9a-f]+)/)||[])[1]),  // strip color
+            width = parseInt((o.match(/(\d+)px/)||[])[1]) || 10, // corner width
+            re = /round|bevelfold|bevel|notch|bite|cool|sharp|slide|jut|curl|tear|fray|wicked|sculpt|long|dog3|dog2|dogfold|dog|invsteep|steep/,
+            fx = ((o.match(re)||['round'])[0]),
+            fold = /dogfold|bevelfold/.test(o),
+            edges = { T:0, B:1 },
+            opts = {
+                TL:  /top|tl|left/.test(o),       TR:  /top|tr|right/.test(o),
+                BL:  /bottom|bl|left/.test(o),    BR:  /bottom|br|right/.test(o)
+            },
+            // vars used in func later
+            strip, pad, cssHeight, j, bot, d, ds, bw, i, w, e, c, common, $horz;
+        
+        if ( !opts.TL && !opts.TR && !opts.BL && !opts.BR )
+            opts = { TL:1, TR:1, BL:1, BR:1 };
+            
+        // support native rounding
+        if ($.fn.corner.defaults.useNative && fx == 'round' && (radius || moz || webkit) && !cc && !sc) {
+            if (opts.TL)
+                $this.css(radius ? 'border-top-left-radius' : moz ? '-moz-border-radius-topleft' : '-webkit-border-top-left-radius', width + 'px');
+            if (opts.TR)
+                $this.css(radius ? 'border-top-right-radius' : moz ? '-moz-border-radius-topright' : '-webkit-border-top-right-radius', width + 'px');
+            if (opts.BL)
+                $this.css(radius ? 'border-bottom-left-radius' : moz ? '-moz-border-radius-bottomleft' : '-webkit-border-bottom-left-radius', width + 'px');
+            if (opts.BR)
+                $this.css(radius ? 'border-bottom-right-radius' : moz ? '-moz-border-radius-bottomright' : '-webkit-border-bottom-right-radius', width + 'px');
+            return;
+        }
+            
+        strip = document.createElement('div');
+        $(strip).css({
+            overflow: 'hidden',
+            height: '1px',
+            minHeight: '1px',
+            fontSize: '1px',
+            backgroundColor: sc || 'transparent',
+            borderStyle: 'solid'
+        });
+    
+        pad = {
+            T: parseInt($.css(this,'paddingTop'))||0,     R: parseInt($.css(this,'paddingRight'))||0,
+            B: parseInt($.css(this,'paddingBottom'))||0,  L: parseInt($.css(this,'paddingLeft'))||0
+        };
+
+        if (typeof this.style.zoom != undefined) this.style.zoom = 1; // force 'hasLayout' in IE
+        if (!keep) this.style.border = 'none';
+        strip.style.borderColor = cc || gpc(this.parentNode);
+        cssHeight = $(this).outerHeight();
+
+        for (j in edges) {
+            bot = edges[j];
+            // only add stips if needed
+            if ((bot && (opts.BL || opts.BR)) || (!bot && (opts.TL || opts.TR))) {
+                strip.style.borderStyle = 'none '+(opts[j+'R']?'solid':'none')+' none '+(opts[j+'L']?'solid':'none');
+                d = document.createElement('div');
+                $(d).addClass('jquery-corner');
+                ds = d.style;
+
+                bot ? this.appendChild(d) : this.insertBefore(d, this.firstChild);
+
+                if (bot && cssHeight != 'auto') {
+                    if ($.css(this,'position') == 'static')
+                        this.style.position = 'relative';
+                    ds.position = 'absolute';
+                    ds.bottom = ds.left = ds.padding = ds.margin = '0';
+                    if (expr)
+                        ds.setExpression('width', 'this.parentNode.offsetWidth');
+                    else
+                        ds.width = '100%';
+                }
+                else if (!bot && $.browser.msie) {
+                    if ($.css(this,'position') == 'static')
+                        this.style.position = 'relative';
+                    ds.position = 'absolute';
+                    ds.top = ds.left = ds.right = ds.padding = ds.margin = '0';
+                    
+                    // fix ie6 problem when blocked element has a border width
+                    if (expr) {
+                        bw = sz(this,'borderLeftWidth') + sz(this,'borderRightWidth');
+                        ds.setExpression('width', 'this.parentNode.offsetWidth - '+bw+'+ "px"');
+                    }
+                    else
+                        ds.width = '100%';
+                }
+                else {
+                    ds.position = 'relative';
+                    ds.margin = !bot ? '-'+pad.T+'px -'+pad.R+'px '+(pad.T-width)+'px -'+pad.L+'px' : 
+                                        (pad.B-width)+'px -'+pad.R+'px -'+pad.B+'px -'+pad.L+'px';                
+                }
+
+                for (i=0; i < width; i++) {
+                    w = Math.max(0,getWidth(fx,i, width));
+                    e = strip.cloneNode(false);
+                    e.style.borderWidth = '0 '+(opts[j+'R']?w:0)+'px 0 '+(opts[j+'L']?w:0)+'px';
+                    bot ? d.appendChild(e) : d.insertBefore(e, d.firstChild);
+                }
+                
+                if (fold && $.support.boxModel) {
+                    if (bot && noBottomFold) continue;
+                    for (c in opts) {
+                        if (!opts[c]) continue;
+                        if (bot && (c == 'TL' || c == 'TR')) continue;
+                        if (!bot && (c == 'BL' || c == 'BR')) continue;
+                        
+                        common = { position: 'absolute', border: 'none', margin: 0, padding: 0, overflow: 'hidden', backgroundColor: strip.style.borderColor };
+                        $horz = $('
').css(common).css({ width: width + 'px', height: '1px' });
+                        switch(c) {
+                        case 'TL': $horz.css({ bottom: 0, left: 0 }); break;
+                        case 'TR': $horz.css({ bottom: 0, right: 0 }); break;
+                        case 'BL': $horz.css({ top: 0, left: 0 }); break;
+                        case 'BR': $horz.css({ top: 0, right: 0 }); break;
+                        }
+                        d.appendChild($horz[0]);
+                        
+                        var $vert = $('
').css(common).css({ top: 0, bottom: 0, width: '1px', height: width + 'px' });
+                        switch(c) {
+                        case 'TL': $vert.css({ left: width }); break;
+                        case 'TR': $vert.css({ right: width }); break;
+                        case 'BL': $vert.css({ left: width }); break;
+                        case 'BR': $vert.css({ right: width }); break;
+                        }
+                        d.appendChild($vert[0]);
+                    }
+                }
+            }
+        }
+    });
+};
+
+$.fn.uncorner = function() { 
+    if (radius || moz || webkit)
+        this.css(radius ? 'border-radius' : moz ? '-moz-border-radius' : '-webkit-border-radius', 0);
+    $('div.jquery-corner', this).remove();
+    return this;
+};
+
+// expose options
+$.fn.corner.defaults = {
+    useNative: true, // true if plugin should attempt to use native browser support for border radius rounding
+    metaAttr:  'data-corner' // name of meta attribute to use for options
+};
+    
+})(jQuery);

From 56d833093031b60205a4e1ce11c9082425921438 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 10:38:56 -0700
Subject: [PATCH 284/502] bah

---
 v3/css/{pytutor-title.css => index.css} |  0
 v3/index.html                           | 20 +++++---------------
 v3/js/index.js                          | 17 +++++++++++++++++
 3 files changed, 22 insertions(+), 15 deletions(-)
 rename v3/css/{pytutor-title.css => index.css} (100%)
 create mode 100644 v3/js/index.js

diff --git a/v3/css/pytutor-title.css b/v3/css/index.css
similarity index 100%
rename from v3/css/pytutor-title.css
rename to v3/css/index.css
diff --git a/v3/index.html b/v3/index.html
index 04781cdd3..b6f784ee0 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -73,14 +73,9 @@
 
 
 
-
+
 
-
+
 
 
 
@@ -109,15 +104,8 @@ 
Python by writing code and visualizing execution

 Tutor provides a rich visualization of variables, heap objects, and
 stack frames.  For example, the following code:

 
-
-x = ["Alice", "Bob", "Charlie"]
-y = x
-z = ["Alice", "Bob", "Charlie"]
-

-
-
will be visualized as the following HTML diagram, which properly shows
-aliasing relationships:

 
+

 
 
Go play with the Online Python Tutor!

 
@@ -185,6 +173,8 @@ 
existing programs that almost work properly

 href="https://github.com/pgbovine/OnlinePythonTutor/">GitHub
 repository.

 
+
Join ___ (low-traffic) Google Group to receive project announcements.

+
 

 Copyright © 2010-2012 Philip
 Guo (philip@pgbovine.net).  All rights reserved.
diff --git a/v3/js/index.js b/v3/js/index.js
new file mode 100644
index 000000000..5c23683b2
--- /dev/null
+++ b/v3/js/index.js
@@ -0,0 +1,17 @@
+var demoTrace = {"code": "myList = (1, (2, (3, None)))\n\ndef sumList(n):\n  if not n:\n    return 0\n  else:\n    return n[0] + sumList(n[1])\n\ntotal = sumList(myList)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 1, "event": "step_line"}, {"ordered_globals": ["myList"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"myList": ["REF", 1]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 9, "event": "step_line"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 3, "event": "call"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 7, "event": "step_line"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f2", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 3, "event": "call"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f2", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f2", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 7, "event": "step_line"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f2", "ordered_varnames": ["n"]}, {"frame_id": 3, "encoded_locals": {"n": ["REF", 3]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f3", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 3, "event": "call"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f2", "ordered_varnames": ["n"]}, {"frame_id": 3, "encoded_locals": {"n": ["REF", 3]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f3", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f2", "ordered_varnames": ["n"]}, {"frame_id": 3, "encoded_locals": {"n": ["REF", 3]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f3", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 7, "event": "step_line"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f2", "ordered_varnames": ["n"]}, {"frame_id": 3, "encoded_locals": {"n": ["REF", 3]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f3", "ordered_varnames": ["n"]}, {"frame_id": 4, "encoded_locals": {"n": null}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f4", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 3, "event": "call"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f2", "ordered_varnames": ["n"]}, {"frame_id": 3, "encoded_locals": {"n": ["REF", 3]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f3", "ordered_varnames": ["n"]}, {"frame_id": 4, "encoded_locals": {"n": null}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f4", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f2", "ordered_varnames": ["n"]}, {"frame_id": 3, "encoded_locals": {"n": ["REF", 3]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f3", "ordered_varnames": ["n"]}, {"frame_id": 4, "encoded_locals": {"n": null}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f4", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f2", "ordered_varnames": ["n"]}, {"frame_id": 3, "encoded_locals": {"n": ["REF", 3]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f3", "ordered_varnames": ["n"]}, {"frame_id": 4, "encoded_locals": {"__return__": 0, "n": null}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f4", "ordered_varnames": ["n", "__return__"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 5, "event": "return"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f2", "ordered_varnames": ["n"]}, {"frame_id": 3, "encoded_locals": {"__return__": 3, "n": ["REF", 3]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f3", "ordered_varnames": ["n", "__return__"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 7, "event": "return"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"__return__": 5, "n": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f2", "ordered_varnames": ["n", "__return__"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 7, "event": "return"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"__return__": 6, "n": ["REF", 1]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n", "__return__"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 7, "event": "return"}, {"ordered_globals": ["myList", "sumList", "total"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"total": 6, "myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 9, "event": "return"}]};
+
+
+$(document).ready(function() {
+  // for rounded corners
+  $(".activityPane").corner('15px');
+
+  var demoViz = new ExecutionVisualizer('demoViz', demoTrace, {startingInstruction: 1,
+                                                               embeddedMode: true,
+                                                               editCodeBaseURL: 'http://pythontutor.com/'});
+
+  // redraw connector arrows on window resize
+  $(window).resize(function() {
+    demoViz.redrawConnectors();
+  });
+});
+ 

From fd1d7835f219cb31abd3b4a6ff078c0d93e85fb9 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 12:36:46 -0700
Subject: [PATCH 285/502] bammmm

---
 v3/css/index.css |  67 +++++++++++++++--
 v3/index.html    | 191 +++++++++++++++++++++++++++--------------------
 v3/js/index.js   |   4 +
 v3/tutor.html    |   2 +-
 4 files changed, 173 insertions(+), 91 deletions(-)

diff --git a/v3/css/index.css b/v3/css/index.css
index 3a4cd2005..e629d001b 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -7,7 +7,7 @@ body {
   font-family: Georgia, Palatino, Times, serif;
 
   font-size: 12pt;
-  max-width: 900px;
+  max-width: 1000px;
   margin-left: auto;
   margin-right: auto;
 }
@@ -23,20 +23,29 @@ h1 {
 }
 
 h2 {
-  font-size: 12pt;
+  font-size: 14pt;
   font-weight: normal;
 
   margin-top: 2px;
-  margin-bottom: 20px;
+  margin-bottom: 0px;
+}
+
+.smallH1 {
+  font-size: 14pt;
 }
 
+
 .titlePane {
   margin-left: auto;
   margin-right: auto;
-  margin-bottom: 25px;
+  margin-bottom: 20px;
   text-align: center;
 }
 
+.titlePane h1 {
+  font-size: 24pt;
+}
+
 .titlePane h2 {
   margin-top: 8px;
 }
@@ -49,12 +58,17 @@ div.mainBodyPane {
 
 div.activityPane {
   /* TOP RIGHT BOTTOM LEFT */
-  padding: 15px 20px 5px 20px;
-  margin-top: 30px;
+  padding: 15px 25px 5px 20px;
   text-align: left;
   border: 3px solid #005583;
 }
 
+div.activityPane h1 {
+  font-size: 22pt;
+  margin-bottom: 20pt;
+}
+
+
 
 ul {
   padding-left: 18px;
@@ -71,12 +85,49 @@ a:hover {
   color: #3D58A2;
 }
 
+div#learnPane {
+  margin-bottom: 10pt;
+}
+
+div#learnPane p {
+  padding-right: 80px;
+}
+
+div#learnPane h3 {
+  font-size: 16pt;
+  font-weight: normal;
+  margin-top: 3px;
+  margin-bottom: 8px;
+}
+
+div#embedPane {
+  margin-right: 5px;
+}
+
+div#sharePane {
+  margin-left: 5px;
+}
+
+div#detailsPane {
+  margin-top: 15px;
+  margin-left: 5px;
+}
+
+table#embedShareTable {
+  border: 0px;
+  width: 100%;
+}
+
+table#embedShareTable td {
+  vertical-align: top;
+}
+
 #footer {
   color: #666666;
   font-size: 9pt;
-  border-top: 1px solid #bbbbbb;
+  /*border-top: 1px solid #bbbbbb;*/
   padding-top: 5px;
-  margin-top: 15px;
+  margin-top: 10px;
 
   max-width: 100%;
   /* center align */
diff --git a/v3/index.html b/v3/index.html
index b6f784ee0..66d57f040 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -29,35 +29,9 @@
 
  -->
 
-
-
 
 
-Online Python Tutor: Learn and practice Python programming in your web browser
+Online Python Tutor: Visually learn Python programming
 
 
 
@@ -84,106 +58,159 @@
 

 
 
Online Python Tutor

-
Learn and practice Python programming in your web browser

+
Visually learn Python programming

 
 

 
+
 

 
+
+  
+    
+  
 
-
It provides web-based interfaces for writing solution and test code,
-executing on a series of graded test inputs, and showing what tests
-passed and failed.

+  
+    
+    
+
+  
+

+
 

 
-
Learn

-
Python by writing code and visualizing execution

+
Learn to program in Python by writing code and visualizing execution

+
+
Online Python Tutor allows teachers and students to write Python
+programs directly in the web browser, execute those programs, step
+forwards and backwards through execution to view the run-time
+state of data structures, and share their visualizations on the web.

 
-
This free educational application allows teachers and students to
-write Python scripts directly in the web browser, execute those scripts,
-single-step forwards and backwards through execution, and view
-the run-time state of all data structures.

+
Rather than simply displaying a text-based console, Online Python
+Tutor visualizes stack frames, variables, and heap objects. For example,
+here is a recursive function that sums linked list elements:

 
-
Rather than displaying a bland text-based console, the Online Python
-Tutor provides a rich visualization of variables, heap objects, and
-stack frames.  For example, the following code:

+

 
+
Since its inception in January 2010, over 100,000 people have used
+Online Python Tutor to understand and debug their programs. In addition,
+instructors in over a dozen universities including MIT, UC Berkeley, UC
+Davis, Sonoma State University, the University of Washington, the
+University of Waterloo, the University of Toronto, Luther College, and
+Swarthmore College have adopted it for teaching introductory computer
+science courses.

 
-
 
-

 
-
Solve

-
programming problems by writing Python code

 
-
The Online Python Tutor also allows students to practice solving
-programming problems like those they would receive for class assignments
-or technical job interviews.

+    

 
-
The above screenshot shows passed and failed tests.  The user can
-click on the "Debug me" button besides one of the sad faces to debug why
-the program failed on a particular test.

+

 
-
Here are some sample practice problems:

+
Embed visualizations in digital textbooks and course lessons

 
-
    
+
    Using just one line of JavaScript code, you can embed an Online
+Python Tutor visualization within your web page. For example, the
+HTML textbook for the introductory CS course at UC Berkeley (CS61A) contains
+dozens of embedded visualizations:
 
-
  • Two-sum
    • 
-
  • Reverse list
    • 
-
  • Remove duplicate characters
    • 
+
    
 
-

+
+
+
+

+
+These visualizations have also been embedded within two other web-based
+digital Python textbook projects: How
+to Think Like a Computer Scientist: Interactive Edition and Computer Science Circles.
+These textbooks collectively attract around 16,000 unique viewers per
+month and are being used in at least 25 universities around the world.
+
+

+
+

+
+
+
 
-

 
-
Debug

-
existing programs that almost work properly

+    

 
-
Using the Online Python Tutor's bidirectional single-stepping and
-data structure visualization capabilities, students can practice
-debugging, an important skill which is rarely covered in web-based
-programming problems.

+

 
-
They can work on problems like, "Change at most 2 lines of code to
-make this almost-correct Python program work properly." Here are
-some sample debugging problems:

+
Share visualizations online

 
-
    
+
    To share your current visualization, click the “Generate
+URL” button and send that URL link in an email, social networking
+post, or forum thread. When recipients click on that link, they will see
+exactly what you are looking at. This is a more effective way for
+students to seek assistance than simply copying-and-pasting code.
    
 
-
  • In-place reverse
    • 
-
  • Binary search
    • 
-
  • Mergesort
    • 
+
     For example, clicking this
+link brings you directly to step 44 of 57 in a program to find prime
+numbers using the Python for-else construct.
    
 
-

+
In the future, we plan to create an authoring environment where you
+can add annotations, discussion threads, and even interactive activities
+on top of your visualizations.

 
 

 
-
 
+

 
-
+
+
+    

 
 

 
+
 
 
 
diff --git a/v3/js/index.js b/v3/js/index.js
index 5c23683b2..3396929ee 100644
--- a/v3/js/index.js
+++ b/v3/js/index.js
@@ -9,6 +9,10 @@ $(document).ready(function() {
                                                                embeddedMode: true,
                                                                editCodeBaseURL: 'http://pythontutor.com/'});
 
+  // customize size a bit:
+  demoViz.domRoot.find('#pyCodeOutputDiv').css('max-width', '400px');
+  demoViz.redrawConnectors(); // don't forget to redraw after resize!
+
   // redraw connector arrows on window resize
   $(window).resize(function() {
     demoViz.redrawConnectors();
diff --git a/v3/tutor.html b/v3/tutor.html
index c6188dcc8..ce7020296 100644
--- a/v3/tutor.html
+++ b/v3/tutor.html
@@ -170,7 +170,7 @@
 
 
To report a bug, click the 'Generate URL' button, paste the URL along
 with a brief error description in an email, and send the email to
-philip@pgbovine.net
+bugs@pythontutor.com
 

 
 


From 78f248880dcd527bede67146e16c57d59a9b4b76 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 12:36:58 -0700
Subject: [PATCH 286/502] bammy

---
 v3/opt-v3-cs61a-embed.png | Bin 0 -> 131722 bytes
 1 file changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 v3/opt-v3-cs61a-embed.png

diff --git a/v3/opt-v3-cs61a-embed.png b/v3/opt-v3-cs61a-embed.png
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zoFvwl2+$(kr;<2)OHLS>6^oMeSohpTT;-0hC?b^P1w`y>X9f|8tD*)xFg16yyZsQ&
zas8=QU){tm6LnY<5kn=tA@H?@{cpF^X{p!Z`u&eQk^f3Ro`~r}Mi5X+PHFr)(W=dL
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wCw(DMqu`0rTi@GxkP!$F2
Date: Tue, 11 Sep 2012 12:39:10 -0700
Subject: [PATCH 287/502] bah

---
 v3/css/index.css | 3 ++-
 v3/index.html    | 3 +--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/v3/css/index.css b/v3/css/index.css
index e629d001b..e9ab8d514 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -109,8 +109,9 @@ div#sharePane {
 }
 
 div#detailsPane {
-  margin-top: 15px;
+  margin-top: 0px;
   margin-left: 5px;
+  border: 0px; /* NO BORDER! */
 }
 
 table#embedShareTable {
diff --git a/v3/index.html b/v3/index.html
index 66d57f040..bcfbcd4cb 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -170,9 +170,8 @@ 
Share visualizations online

 
 

 
-
More Details

-
 

+More details:
 
 
    
 

From 0aa81340d47d6d9b3035d56fbc9846c812d52e3a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 13:00:33 -0700
Subject: [PATCH 288/502] picky

---
 v3/css/index.css | 10 +++++++---
 v3/index.html    | 46 ++++++++++++++++++++++++++--------------------
 v3/tutor.html    |  2 +-
 3 files changed, 34 insertions(+), 24 deletions(-)

diff --git a/v3/css/index.css b/v3/css/index.css
index e9ab8d514..02054333e 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -100,6 +100,10 @@ div#learnPane h3 {
   margin-bottom: 8px;
 }
 
+tt {
+  font-size: 85%;
+}
+
 div#embedPane {
   margin-right: 5px;
 }
@@ -126,9 +130,9 @@ table#embedShareTable td {
 #footer {
   color: #666666;
   font-size: 9pt;
-  /*border-top: 1px solid #bbbbbb;*/
-  padding-top: 5px;
-  margin-top: 10px;
+  border-top: 1px solid #bbbbbb;
+  padding-top: 0px;
+  margin-top: 15px;
 
   max-width: 100%;
   /* center align */
diff --git a/v3/index.html b/v3/index.html
index bcfbcd4cb..cadcd9887 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -133,13 +133,6 @@ 
    Embed visualizations in digital textbooks and course l
 
 
    
 
-

-
-
-
 
 
@@ -170,14 +163,15 @@ 
Share visualizations online

 
 

 
-

-More details:
 
+

+More Details:
 
    
 
-  
  • Supports Python 2.7
-  and 3.2 with limited
-  module imports and no file I/O
+  
  • Online Python Tutor supports Python 2.7 and 3.2 with limited module
+  imports and no file I/O
 
   
  • BSD-licensed source code available in this GitHub
@@ -185,22 +179,18 @@ 
    Share visualizations online
    
 
   
  • Main technologies: Python bdb debugger
-  framework for backend execution trace generation, D3.js for frontend data management and
   visualization, jsPlumb for
   graphical arrow rendering, and CodeMirror for syntax highlighting.
- 
-  
  • Join our low-traffic Google Group to receive project announcements.
-
-  
  • To report bugs, email bugs@pythontutor.com
+  href="http://codemirror.net/">CodeMirror for syntax highlighting
 
 

-
 

 
-

+ 
 
+

 
     
 
@@ -210,6 +200,22 @@ 
Share visualizations online

 

 
 
+
+
+
+
 
 
 
diff --git a/v3/tutor.html b/v3/tutor.html
index ce7020296..d9b0d630d 100644
--- a/v3/tutor.html
+++ b/v3/tutor.html
@@ -170,7 +170,7 @@
 
 
To report a bug, click the 'Generate URL' button, paste the URL along
 with a brief error description in an email, and send the email to
-bugs@pythontutor.com
+feedback@pythontutor.com
 

 
 


From f92ee2a15aa8a05a3afd06eab752dee5031bd10d Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 14:28:14 -0700
Subject: [PATCH 289/502] width tweak

---
 v3/css/index.css | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/v3/css/index.css b/v3/css/index.css
index 02054333e..b65071189 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -7,7 +7,7 @@ body {
   font-family: Georgia, Palatino, Times, serif;
 
   font-size: 12pt;
-  max-width: 1000px;
+  max-width: 900px;
   margin-left: auto;
   margin-right: auto;
 }
@@ -51,7 +51,6 @@ h2 {
 }
 
 div.mainBodyPane {
-  width: 100%;
   margin-left: auto;
   margin-right: auto;
 }

From 7b65e547d54ae21a914975a91fdacc4a146ad467 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 14:34:42 -0700
Subject: [PATCH 290/502] tiny

---
 v3/index.html | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/index.html b/v3/index.html
index cadcd9887..d8388e020 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -108,7 +108,7 @@ 
Start using Online Python Tutor now

 
 

 
-
Embed visualizations in digital textbooks and course lessons

+
Embed visualizations in digital textbooks

 
 
Using just one line of JavaScript code, you can embed an Online
 Python Tutor visualization within your web page. For example, the

From 3616451330ea2630f647dd3d03ee0429b7a50b42 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 14:39:53 -0700
Subject: [PATCH 291/502] testing

---
 v3/css/index.css | 9 +++++++++
 v3/index.html    | 4 ++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/v3/css/index.css b/v3/css/index.css
index b65071189..f6cff6493 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -126,6 +126,15 @@ table#embedShareTable td {
   vertical-align: top;
 }
 
+table#embedShareTable td#embedPaneTd {
+  width: 60%;
+}
+
+table#embedShareTable td#sharePaneTd {
+  width: 40%;
+}
+
+
 #footer {
   color: #666666;
   font-size: 9pt;
diff --git a/v3/index.html b/v3/index.html
index d8388e020..0914a9997 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -104,7 +104,7 @@ 
Start using Online Python Tutor now

   
 
   
-    
+    
 
 

 
@@ -137,7 +137,7 @@ 
Embed visualizations in digital textbooks

 
 
     
-    
+    
 
 

 

From 3ebabb3ffb87ee3fca3bd4f2a0bcfe7621fb3fb5 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 14:44:51 -0700
Subject: [PATCH 292/502] tiny

---
 v3/index.html | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/v3/index.html b/v3/index.html
index 0914a9997..1b95de58a 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -204,9 +204,9 @@ 
Share visualizations online

 
 
Join the pythontutor-users
-mailing list to participate in user discussions or the low-traffic pythontutor-announce
-mailing list to receive occasional announcements.

+to receive occasional announcements.

 
 
To privately report bugs, suggestions, or feature requests, email feedback@pythontutor.com

 

From fef9e69a636f78fefbd1e4829b896172f02a6567 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 17:06:22 -0700
Subject: [PATCH 293/502] more tweaks

---
 v3/css/index.css |  3 +--
 v3/index.html    | 47 ++++++++++++++++++++++++++---------------------
 v3/tutor.html    | 10 ++++++++--
 3 files changed, 35 insertions(+), 25 deletions(-)

diff --git a/v3/css/index.css b/v3/css/index.css
index f6cff6493..39c374155 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -15,7 +15,6 @@ body {
 
 h1 {
   font-weight: normal;
-  font-size: 20pt;
   line-height: 1em;  /* enforce single spacing so that Georgia works */
 
   margin-top: 0px;
@@ -23,7 +22,7 @@ h1 {
 }
 
 h2 {
-  font-size: 14pt;
+  font-size: 16pt;
   font-weight: normal;
 
   margin-top: 2px;
diff --git a/v3/index.html b/v3/index.html
index 1b95de58a..0ce42180c 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -31,7 +31,7 @@
 
 
 
-Online Python Tutor: Visually learn Python programming
+Online Python Tutor: Learn programming visually
 
 
 
@@ -58,7 +58,7 @@
 

 
 
Online Python Tutor

-
Visually learn Python programming

+
Learn programming visually

 
 

 
@@ -75,7 +75,7 @@ 
Learn to program in Python by writing code and visuali
 
 
Online Python Tutor allows teachers and students to write Python
 programs directly in the web browser, execute those programs, step
-forwards and backwards through execution to view the run-time
+forwards and backwards through execution to view the run-time
 state of data structures, and share their visualizations on the web.

 
 
Rather than simply displaying a text-based console, Online Python
@@ -84,13 +84,17 @@ 
Learn to program in Python by writing code and visuali
 
 

 
-
Since its inception in January 2010, over 100,000 people have used
-Online Python Tutor to understand and debug their programs. In addition,
-instructors in over a dozen universities including MIT, UC Berkeley, UC
-Davis, Sonoma State University, the University of Washington, the
-University of Waterloo, the University of Toronto, Luther College, and
-Swarthmore College have adopted it for teaching introductory computer
-science courses.

+
Over 100,000 people so far have used Online Python Tutor to
+understand and debug their programs, often as a supplement to textbooks,
+lecture notes, and online tutorials.

+
+
In addition, instructors in over a dozen universities including MIT,
+UC Berkeley, UC Davis, Sonoma State University, the University of
+Washington, the University of Waterloo, the University of Toronto,
+Luther College, and Swarthmore College have adopted it for teaching
+introductory computer science courses. We
+are seeking partnerships with educators at all grade levels; email
+philip@pythontutor.com if you are interested.

 
 

 
@@ -123,8 +127,8 @@ 
Embed visualizations in digital textbooks

 
 

 
-These visualizations have also been embedded within two other web-based
-digital Python textbook projects: How
 to Think Like a Computer Scientist: Interactive Edition and Computer Science Circles.
@@ -147,16 +151,16 @@ 
Share visualizations online

 URL” button and send that URL link in an email, social networking
 post, or forum thread. When recipients click on that link, they will see
 exactly what you are looking at. This is a more effective way for
-students to seek assistance than simply copying-and-pasting code.

+students to seek assistance rather than simply copying-and-pasting code.

 
 
 For example, clicking this
-link brings you directly to step 44 of 57 in a program to find prime
-numbers using the Python for-else construct.

+link brings you directly to step 44 of 57 in a program that finds
+prime numbers using the Python for-else construct.

 
-
In the future, we plan to create an authoring environment where you
-can add annotations, discussion threads, and even interactive activities
-on top of your visualizations.

+
In the future, we plan to create an online authoring environment so
+that you can add annotations, discussion threads, and interactive
+activities on top of your visualizations.

 
 

 
@@ -171,7 +175,8 @@ 
Share visualizations online

   
  • Online Python Tutor supports Python 2.7 and 3.2 with limited module
-  imports and no file I/O
+  imports and no file I/O, hosted on either a CGI-capable web server or
+  on Google App Engine
 
   
  • BSD-licensed source code available in this GitHub
@@ -179,7 +184,7 @@ 
    Share visualizations online
    
 
   
  • Main technologies: Python bdb debugger
-  framework for backend trace generation, D3.js for frontend data management and
   visualization, jsPlumb for
   graphical arrow rendering, and Share visualizations online
 href="https://groups.google.com/forum/#!forum/pythontutor-announce">pythontutor-announce
 to receive occasional announcements.
    
 
-
    To privately report bugs, suggestions, or feature requests, email feedback@pythontutor.com
    
+
    To privately report bugs, suggestions, or feature requests, email philip@pythontutor.com
    
 
 
    Copyright © 2010-2012 Philip Guo. All rights reserved.
    
 
diff --git a/v3/tutor.html b/v3/tutor.html
index d9b0d630d..ef51d79a5 100644
--- a/v3/tutor.html
+++ b/v3/tutor.html
@@ -170,16 +170,22 @@
 
 
    To report a bug, click the 'Generate URL' button, paste the URL along
 with a brief error description in an email, and send the email to
-feedback@pythontutor.com
+philip@pythontutor.com
 
    
 
+
    Join the pythontutor-users
+mailing list to participate in user discussions or pythontutor-announce
+to receive occasional announcements.
    
+
 
    
 
 Online Python Tutor supports Python 2.7 and Python 3.2 with limited module
 imports and no file I/O. It is designed for teaching programming, not
-for running or debugging production code. The code is open source on GitHub.
 
 
    

From 79bb63e89343da13d6eab0613faf90c75a206b53 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 17:10:40 -0700
Subject: [PATCH 294/502] minor

---
 v3/css/index.css |  1 +
 v3/index.html    | 14 ++++++--------
 2 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/v3/css/index.css b/v3/css/index.css
index 39c374155..116e180e4 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -119,6 +119,7 @@ div#detailsPane {
 table#embedShareTable {
   border: 0px;
   width: 100%;
+  table-layout: fixed; /* to get IE to work */
 }
 
 table#embedShareTable td {
diff --git a/v3/index.html b/v3/index.html
index 0ce42180c..f8e82d0d3 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -73,14 +73,12 @@ 
    Learn programming visually
    
 
 
    Learn to program in Python by writing code and visualizing execution
    
 
-
    Online Python Tutor allows teachers and students to write Python
-programs directly in the web browser, execute those programs, step
-forwards and backwards through execution to view the run-time
-state of data structures, and share their visualizations on the web.
    
-
-
    Rather than simply displaying a text-based console, Online Python
-Tutor visualizes stack frames, variables, and heap objects. For example,
-here is a recursive function that sums linked list elements:
    
+
    Online Python Tutor allows teachers and students to write Python programs directly in the web
+browser, execute those programs, and then step forwards and backwards
+through execution to view the run-time state of data structures. For
+example, here is a recursive function that sums linked list
+elements:
    
 
 
    
 

From e7adbfe9feab5572919a6c61d14c98a1ac8208f4 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 17:16:20 -0700
Subject: [PATCH 295/502] bah

---
 v3/css/index.css | 1 -
 1 file changed, 1 deletion(-)

diff --git a/v3/css/index.css b/v3/css/index.css
index 116e180e4..39c374155 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -119,7 +119,6 @@ div#detailsPane {
 table#embedShareTable {
   border: 0px;
   width: 100%;
-  table-layout: fixed; /* to get IE to work */
 }
 
 table#embedShareTable td {

From 9f32258f0f74dbbeba640b61d6e0d96c1ae32da6 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 17:48:30 -0700
Subject: [PATCH 296/502] teeny

---
 v3/index.html | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/index.html b/v3/index.html
index f8e82d0d3..8e0518acb 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -121,7 +121,7 @@ 
    Embed visualizations in digital textbooks
    
 
    
 
 
-
+
 
 
    
 

From 3159470719a08514b29ef4bef6aaf5608dd21cd3 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 20:13:02 -0700
Subject: [PATCH 297/502] revamped

---
 v3/css/index.css | 58 ++++++++++++++++++------------------------------
 v3/index.html    | 44 ++++++++++++++----------------------
 v3/js/index.js   |  9 ++------
 3 files changed, 41 insertions(+), 70 deletions(-)

diff --git a/v3/css/index.css b/v3/css/index.css
index 39c374155..ef22e42e6 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -7,6 +7,7 @@ body {
   font-family: Georgia, Palatino, Times, serif;
 
   font-size: 12pt;
+
   max-width: 900px;
   margin-left: auto;
   margin-right: auto;
@@ -15,20 +16,10 @@ body {
 
 h1 {
   font-weight: normal;
-  line-height: 1em;  /* enforce single spacing so that Georgia works */
-
   margin-top: 0px;
   margin-bottom: 8px;
 }
 
-h2 {
-  font-size: 16pt;
-  font-weight: normal;
-
-  margin-top: 2px;
-  margin-bottom: 0px;
-}
-
 .smallH1 {
   font-size: 14pt;
 }
@@ -37,16 +28,13 @@ h2 {
 .titlePane {
   margin-left: auto;
   margin-right: auto;
-  margin-bottom: 20px;
+  margin-bottom: 0px;
   text-align: center;
 }
 
 .titlePane h1 {
-  font-size: 24pt;
-}
-
-.titlePane h2 {
-  margin-top: 8px;
+  font-size: 22pt;
+  margin-bottom: 5px;
 }
 
 div.mainBodyPane {
@@ -56,25 +44,28 @@ div.mainBodyPane {
 
 div.activityPane {
   /* TOP RIGHT BOTTOM LEFT */
-  padding: 15px 25px 5px 20px;
+  padding: 15px 0px /* make right padding ZERO and just right-pad 'p' */ 5px 20px;
   text-align: left;
   border: 3px solid #005583;
 }
 
+div.activityPane p {
+  padding-right: 30px;
+}
+
 div.activityPane h1 {
   font-size: 22pt;
   margin-bottom: 20pt;
 }
 
 
-
 ul {
   padding-left: 18px;
 }
 
 li {
-  margin-bottom: 6px;
-  font-size: 11pt;
+  margin-bottom: 8px;
+  font-size: 10pt;
 }
 
 a,
@@ -88,18 +79,18 @@ div#learnPane {
 }
 
 div#learnPane p {
-  padding-right: 80px;
+  padding-right: 100px;
 }
 
 div#learnPane h3 {
-  font-size: 16pt;
+  font-size: 17pt;
   font-weight: normal;
-  margin-top: 3px;
-  margin-bottom: 8px;
+  margin-top: 5px;
+  margin-bottom: 10px;
 }
 
 tt {
-  font-size: 85%;
+  /*font-size: 85%;*/
 }
 
 div#embedPane {
@@ -116,20 +107,20 @@ div#detailsPane {
   border: 0px; /* NO BORDER! */
 }
 
-table#embedShareTable {
+table.layoutTbl {
   border: 0px;
-  width: 100%;
+  max-width: 900px;
 }
 
-table#embedShareTable td {
+table.layoutTbl td {
   vertical-align: top;
 }
 
-table#embedShareTable td#embedPaneTd {
+table.layoutTbl td#embedPaneTd {
   width: 60%;
 }
 
-table#embedShareTable td#sharePaneTd {
+table.layoutTbl td#sharePaneTd {
   width: 40%;
 }
 
@@ -139,16 +130,11 @@ table#embedShareTable td#sharePaneTd {
   font-size: 9pt;
   border-top: 1px solid #bbbbbb;
   padding-top: 0px;
-  margin-top: 15px;
+  margin-top: 10px;
 
-  max-width: 100%;
   /* center align */
   margin-left: auto;
   margin-right: auto;
 
   font-family: verdana, arial, helvetica, sans-serif;
 }
-
-
-/* necessary for CodeMirror error line highlighting to work! */
-.CodeMirror .errorLine { background: #ffff3f !important; }
diff --git a/v3/index.html b/v3/index.html
index 8e0518acb..165bb5c34 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -31,7 +31,7 @@
 
 
 
-Online Python Tutor: Learn programming visually
+Online Python Tutor: Learn Python programming in your web browser
 
 
 
@@ -46,9 +46,7 @@
 
 
 
-
 
-
 
 
 
@@ -56,18 +54,14 @@
 
 
 
    
-
-
    Online Python Tutor
    
-
    Learn programming visually
    
-
+  
    Online Python Tutor
    
 
    
 
-
 
    
 
-
+
    
-    
+
    
   
    
+    
 
 
    
 
@@ -76,9 +70,11 @@ 
    Learn to program in Python by writing code and visuali
 
    Online Python Tutor allows teachers and students to write Python programs directly in the web
 browser, execute those programs, and then step forwards and backwards
-through execution to view the run-time state of data structures. For
-example, here is a recursive function that sums linked list
-elements:
    
+through execution to view the run-time state of data structures.
    
+
+
    For example, here is a recursive function that finds the sum of
+linked list elements. Click the “Forward” button to start
+stepping through execution.
    
 
 
    
 
@@ -86,12 +82,12 @@ 
    Learn to program in Python by writing code and visuali
 understand and debug their programs, often as a supplement to textbooks,
 lecture notes, and online tutorials.
    
 
-
    In addition, instructors in over a dozen universities including MIT,
-UC Berkeley, UC Davis, Sonoma State University, the University of
-Washington, the University of Waterloo, the University of Toronto,
-Luther College, and Swarthmore College have adopted it for teaching
-introductory computer science courses. We
-are seeking partnerships with educators at all grade levels; email
+
    Instructors in over a dozen universities such as MIT, UC Berkeley, UC
+Davis, Sonoma State University, the University of Washington, the
+University of Waterloo, the University of Toronto, Luther College, and
+Swarthmore College have adopted it for teaching introductory computer
+science courses. We are seeking
+partnerships with educators at all grade levels; email
 philip@pythontutor.com if you are interested.
    
 
 
    
@@ -100,11 +96,11 @@ 
    Start using Online Python Tutor now
    
 
 
    
 
-
-
         		
   
    
 
+
@@ -218,7 +210,5 @@ 
    Share visualizations online
    
 
 
-
 
-
diff --git a/v3/js/index.js b/v3/js/index.js
index 3396929ee..c63f8febe 100644
--- a/v3/js/index.js
+++ b/v3/js/index.js
@@ -1,18 +1,13 @@
-var demoTrace = {"code": "myList = (1, (2, (3, None)))\n\ndef sumList(n):\n  if not n:\n    return 0\n  else:\n    return n[0] + sumList(n[1])\n\ntotal = sumList(myList)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 1, "event": "step_line"}, {"ordered_globals": ["myList"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"myList": ["REF", 1]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 9, "event": "step_line"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 3, "event": "call"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 7, "event": "step_line"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f2", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 3, "event": "call"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f2", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f2", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 7, "event": "step_line"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f2", "ordered_varnames": ["n"]}, {"frame_id": 3, "encoded_locals": {"n": ["REF", 3]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f3", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 3, "event": "call"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", "func_name": "sumList", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": false, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f2", "ordered_varnames": ["n"]}, {"frame_id": 3, "encoded_locals": {"n": ["REF", 3]}, "is_highlighted": true, "is_parent": false, "func_name": "sumList", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sumList_f3", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "sumList": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "sumList(n)", null]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["myList", "sumList"], "stdout": "", 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"stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["n"]}, {"frame_id": 3, "encoded_locals": {"n": ["REF", 3]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["n"]}, {"frame_id": 4, "encoded_locals": {"n": null}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f4", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "listSum": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "listSum(n)", null]}, "line": 3, "event": "call"}, {"ordered_globals": ["myList", "listSum"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["n"]}, {"frame_id": 3, "encoded_locals": {"n": ["REF", 3]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["n"]}, {"frame_id": 4, "encoded_locals": {"n": null}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f4", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "listSum": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "listSum(n)", null]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["myList", "listSum"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["n"]}, {"frame_id": 3, "encoded_locals": {"n": ["REF", 3]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["n"]}, {"frame_id": 4, "encoded_locals": {"n": null}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f4", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "listSum": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "listSum(n)", null]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["myList", "listSum"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["n"]}, {"frame_id": 3, "encoded_locals": {"n": ["REF", 3]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["n"]}, {"frame_id": 4, "encoded_locals": {"__return__": 0, "n": null}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f4", "ordered_varnames": ["n", "__return__"]}], "globals": {"myList": ["REF", 1], "listSum": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "listSum(n)", null]}, "line": 5, "event": "return"}, {"ordered_globals": ["myList", "listSum"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["n"]}, {"frame_id": 3, "encoded_locals": {"__return__": 3, "n": ["REF", 3]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["n", "__return__"]}], "globals": {"myList": ["REF", 1], "listSum": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "listSum(n)", null]}, "line": 7, "event": "return"}, {"ordered_globals": ["myList", "listSum"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"__return__": 5, "n": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["n", "__return__"]}], "globals": {"myList": ["REF", 1], "listSum": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "listSum(n)", null]}, "line": 7, "event": "return"}, {"ordered_globals": ["myList", "listSum"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"__return__": 6, "n": ["REF", 1]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["n", "__return__"]}], "globals": {"myList": ["REF", 1], "listSum": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "listSum(n)", null]}, "line": 7, "event": "return"}, {"ordered_globals": ["myList", "listSum", "total"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"total": 6, "myList": ["REF", 1], "listSum": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "listSum(n)", null]}, "line": 9, "event": "return"}]};
 
 
 $(document).ready(function() {
   // for rounded corners
   $(".activityPane").corner('15px');
 
-  var demoViz = new ExecutionVisualizer('demoViz', demoTrace, {startingInstruction: 1,
-                                                               embeddedMode: true,
+  var demoViz = new ExecutionVisualizer('demoViz', demoTrace, {embeddedMode: true,
                                                                editCodeBaseURL: 'http://pythontutor.com/'});
 
-  // customize size a bit:
-  demoViz.domRoot.find('#pyCodeOutputDiv').css('max-width', '400px');
-  demoViz.redrawConnectors(); // don't forget to redraw after resize!
-
   // redraw connector arrows on window resize
   $(window).resize(function() {
     demoViz.redrawConnectors();

From d8c42de0487023f5ea986b549e93dc5681ccae69 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 23:04:45 -0700
Subject: [PATCH 298/502] one more big design push!

---
 v3/css/index.css | 67 +++++++++++++++++++++++++++++++++++++++++++-----
 v3/index.html    | 30 ++++++++++++++--------
 2 files changed, 81 insertions(+), 16 deletions(-)

diff --git a/v3/css/index.css b/v3/css/index.css
index ef22e42e6..c423b0707 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -22,8 +22,20 @@ h1 {
 
 .smallH1 {
   font-size: 14pt;
+  margin-left: -2px;
 }
 
+#optLink {
+  font-size: 14pt;
+  text-decoration: none;
+  color: black;
+  font-weight: bold;
+}
+
+#optLink:hover {
+  color: #3D58A2;
+  text-decoration: underline;
+}
 
 .titlePane {
   margin-left: auto;
@@ -74,19 +86,38 @@ a:hover {
   color: #3D58A2;
 }
 
+#learnHeading, #embedHeading, #shareHeading {
+  font-family: verdana, arial, helvetica, sans-serif;
+  font-weight: bold;
+  font-size: 24pt;
+}
+
+#learnHeading {
+  color: #062270;
+}
+
 div#learnPane {
-  margin-bottom: 10pt;
+  margin-top: 6pt;
+  margin-bottom: 8pt;
+  border: 5px solid #062270;
 }
 
 div#learnPane p {
   padding-right: 100px;
 }
 
-div#learnPane h3 {
-  font-size: 17pt;
+div#learnPane #startLink {
+  font-size: 16pt;
   font-weight: normal;
-  margin-top: 5px;
-  margin-bottom: 10px;
+  margin-top: 10px;
+  margin-bottom: 20px;
+  font-family: verdana, arial, helvetica, sans-serif;
+}
+
+div#learnPane #startLink a {
+  border-bottom-style: solid;
+  border-bottom-width: 2px;
+  text-decoration: none;
 }
 
 tt {
@@ -95,10 +126,21 @@ tt {
 
 div#embedPane {
   margin-right: 5px;
+  border: 5px solid #5a7973;
+}
+
+
+#embedHeading {
+  color: #5a7973;
 }
 
 div#sharePane {
   margin-left: 5px;
+  border: 5px solid #4284d3;
+}
+
+#shareHeading {
+  color: #4284d3;
 }
 
 div#detailsPane {
@@ -107,6 +149,19 @@ div#detailsPane {
   border: 0px; /* NO BORDER! */
 }
 
+#partnershipDiv {
+  /*background-color: #d8e1e3;*/
+  background-color: #d9cdb6;
+  width: 60%;
+  padding: 8px;
+  margin-left: auto;
+  margin-right: auto;
+  text-align: center;
+
+  font-size: 10pt;
+  font-family: Monaco, arial, sans-serif;
+}
+
 table.layoutTbl {
   border: 0px;
   max-width: 900px;
@@ -130,7 +185,7 @@ table.layoutTbl td#sharePaneTd {
   font-size: 9pt;
   border-top: 1px solid #bbbbbb;
   padding-top: 0px;
-  margin-top: 10px;
+  margin-top: 30px;
 
   /* center align */
   margin-left: auto;
diff --git a/v3/index.html b/v3/index.html
index 165bb5c34..8d6edf30d 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -53,9 +53,11 @@
 
 
 
+
 
 
    
 
@@ -65,9 +67,10 @@ 
    Online Python Tutor
    
 
 
    
 
-
    Learn to program in Python by writing code and visualizing execution
    
+
    LEARN to program in Python by writing code and visualizing execution
    
 
-
    Online Python Tutor allows teachers and students to write Online Python Tutor
+enables teachers and students to write Python programs directly in the web
 browser, execute those programs, and then step forwards and backwards
 through execution to view the run-time state of data structures.
    
@@ -86,13 +89,19 @@ 
    Learn to program in Python by writing code and visuali
 Davis, Sonoma State University, the University of Washington, the
 University of Waterloo, the University of Toronto, Luther College, and
 Swarthmore College have adopted it for teaching introductory computer
-science courses. We are seeking
-partnerships with educators at all grade levels; email
-philip@pythontutor.com if you are interested.
    
+science courses.
+
    
 
+
    
+We are seeking partnerships with educators at all grade levels.
+Please email philip@pythontutor.com if you are interested.
 
    
 
-
    Start using Online Python Tutor now
    
+
    
+
+
 
 
    
 
@@ -106,7 +115,7 @@ 
    Start using Online Python Tutor now
    
 
 
    
 
-
    Embed visualizations in digital textbooks
    
+
    EMBED visualizations in digital textbooks
    
 
 
    Using just one line of JavaScript code, you can embed an Online
 Python Tutor visualization within your web page. For example, the
@@ -138,7 +147,7 @@ 
    Embed visualizations in digital textbooks
    
 
 
    
 
-
    Share visualizations online
    
+
    SHARE visualizations online
    
 
 
    To share your current visualization, click the “Generate
 URL” button and send that URL link in an email, social networking
@@ -167,8 +176,9 @@ 
    Share visualizations online
    
   
  • Online Python Tutor supports Python 2.7 and 3.2 with limited module
-  imports and no file I/O, hosted on either a CGI-capable web server or
-  on Google App Engine
+  imports and no file I/O, hosted on either a CGI-capable server or on
+  Google App
+  Engine
 
   
  • BSD-licensed source code available in this GitHub

From efaab747c3f2645c1e4ebe107f4c057438a583b2 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 23:15:39 -0700
Subject: [PATCH 299/502] minor

---
 v3/css/index.css |  2 +-
 v3/index.html    | 12 ++++--------
 2 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/v3/css/index.css b/v3/css/index.css
index c423b0707..6ddc27098 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -76,7 +76,7 @@ ul {
 }
 
 li {
-  margin-bottom: 8px;
+  margin-bottom: 12px;
   font-size: 10pt;
 }
 
diff --git a/v3/index.html b/v3/index.html
index 8d6edf30d..5bb52060e 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -173,21 +173,17 @@ 
    SHARE visualizations on
 More Details:
 
      
 
-  
    • Online Python Tutor supports Python 2.7 and 3.2 with limited module
+  
    • Online Python Tutor supports Python 2.7 and 3.2 with limited module
   imports and no file I/O, hosted on either a CGI-capable server or on
   Google App
   Engine
 
-  
    • BSD-licensed source code available in this GitHub
-  repository
+  
    • BSD-licensed source code available on GitHub
 
   
    • Main technologies: Python bdb debugger
-  framework for backend execution trace generation, D3.js for frontend data management and
+  framework for execution trace generation, D3.js for data mapping and
   visualization, jsPlumb for
   graphical arrow rendering, and CodeMirror for syntax highlighting

From 940fa54a9a20e3b7d699a4a05e449b476e940237 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 23:29:25 -0700
Subject: [PATCH 300/502] bah

---
 v3/index.html  | 2 +-
 v3/js/index.js | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/v3/index.html b/v3/index.html
index 5bb52060e..5b62c5c29 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -156,7 +156,7 @@ 
      SHARE visualizations on
 students to seek assistance rather than simply copying-and-pasting code.
      
 
 
       For example, clicking this
+href="tutor.html#code=%23+find+primes+using+a+for-else+construct%0Afor+n+in+range(2,+10)%3A%0A++++x_range+%3D+range(2,+n)%0A++++for+x+in+x_range%3A%0A++++++++if+n+%25+x+%3D%3D+0%3A%0A++++++++++++break%0A++++else%3A%0A++++++++%23+loop+fell+through+without+finding+a+factor%0A++++++++print(n)&curInstr=43&mode=visualize&cumulative_mode=false&python_version=2">this
 link brings you directly to step 44 of 57 in a program that finds
 prime numbers using the Python for-else construct.
      
 
diff --git a/v3/js/index.js b/v3/js/index.js
index c63f8febe..73c070adc 100644
--- a/v3/js/index.js
+++ b/v3/js/index.js
@@ -6,7 +6,7 @@ $(document).ready(function() {
   $(".activityPane").corner('15px');
 
   var demoViz = new ExecutionVisualizer('demoViz', demoTrace, {embeddedMode: true,
-                                                               editCodeBaseURL: 'http://pythontutor.com/'});
+                                                               editCodeBaseURL: ''});
 
   // redraw connector arrows on window resize
   $(window).resize(function() {

From 9f71383a67dce5fe702071b8b9f1846201556528 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 23:30:51 -0700
Subject: [PATCH 301/502] t

---
 v3/js/index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/js/index.js b/v3/js/index.js
index 73c070adc..c63f8febe 100644
--- a/v3/js/index.js
+++ b/v3/js/index.js
@@ -6,7 +6,7 @@ $(document).ready(function() {
   $(".activityPane").corner('15px');
 
   var demoViz = new ExecutionVisualizer('demoViz', demoTrace, {embeddedMode: true,
-                                                               editCodeBaseURL: ''});
+                                                               editCodeBaseURL: 'http://pythontutor.com/'});
 
   // redraw connector arrows on window resize
   $(window).resize(function() {

From 0677f8baef66d4e49898b747ee603e32c5fd10a8 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 11 Sep 2012 23:31:33 -0700
Subject: [PATCH 302/502] tough

---
 v3/js/index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/js/index.js b/v3/js/index.js
index c63f8febe..45daad561 100644
--- a/v3/js/index.js
+++ b/v3/js/index.js
@@ -6,7 +6,7 @@ $(document).ready(function() {
   $(".activityPane").corner('15px');
 
   var demoViz = new ExecutionVisualizer('demoViz', demoTrace, {embeddedMode: true,
-                                                               editCodeBaseURL: 'http://pythontutor.com/'});
+                                                               editCodeBaseURL: 'tutor.html'});
 
   // redraw connector arrows on window resize
   $(window).resize(function() {

From 07a2a652afb820bfd7d9579b03bd246f545e3f91 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 12 Sep 2012 00:07:36 -0700
Subject: [PATCH 303/502] more copyediting

---
 README        | 40 ++++++++++++++++++++++++++++++++++++++--
 v3/index.html | 17 +++++++++--------
 2 files changed, 47 insertions(+), 10 deletions(-)

diff --git a/README b/README
index fec3998f6..8401ea695 100644
--- a/README
+++ b/README
@@ -25,8 +25,44 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 ======
 
 v1-v2/
-  Version 1 - Released on January 19, 2010
-  Version 2 - Released on October  4, 2011
+  Version 1 - released on January 19, 2010
+  "Release" email to 15 friends:
+
+  Subject: version 0.0000001alpha of my online Python tutor
+
+  Body:
+    '''
+    hi python fans (and non-fans) ...
+
+    this is what i've been hacking on for the past few days instead of doing my research ;)  i'm planning to use it as a platform for creating interactive online programming tutorials as part of a volunteer project ...
+
+    http://python.pgrind.com/
+
+    it'd be great to get your feedback on what i have so far.  i'd love to hear suggestions or complaints.  thanks in advance!
+
+    please don't share this link yet, mostly because my app is still buggy and insecure (i definitely don't want random peoples from the internet trying to hack it right now!)
+
+    pg
+    '''
+
+  Version 2 - released on October 4, 2011
+  "Release" email to 13 friends:
+
+  Body:
+    '''
+    Dear subset of people who cared about my prior email from almost 2 years ago ...
+
+    I've recently kicked it up a notch with a "2.0" version and am about to do a public release soon.  I'd really appreciate any feedback, criticism, and especially bug reports on Internet Explorer ;)
+
+    http://people.csail.mit.edu/pgbovine/opt-prerelease/
+
+    Please don't share the link yet since it will be dead soon when I move this app to its permanent home.  I just want to get some early feedback to eliminate the obviously embarrassing bugs before launch.
+
+    THANKS!
+
+    pg
+    '''
+
 
 v3/
   Version 3 - Released in September 2012
diff --git a/v3/index.html b/v3/index.html
index 5b62c5c29..b0326e5b6 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -93,8 +93,8 @@ 
      LEARN to program in Pyt
 
      
 
 
      
-We are seeking partnerships with educators at all grade levels.
-Please email philip@pythontutor.com if you are interested.
+We are actively seeking partnerships with educators at all levels.
+Email philip@pythontutor.com if you are interested.
 
      
 
 
      
@@ -150,18 +150,19 @@ 
      EMBED visualizations in
 
      SHARE visualizations online
      
 
 
      To share your current visualization, click the “Generate
-URL” button and send that URL link in an email, social networking
-post, or forum thread. When recipients click on that link, they will see
-exactly what you are looking at. This is a more effective way for
-students to seek assistance rather than simply copying-and-pasting code.
      
+URL” button and paste that URL link in an email, social networking
+post, or forum question. When recipients click on that link, they will
+see that exact visualization. This feature is a more effective way for
+students to seek assistance as opposed to copying-and-pasting code
+snippets.
      
 
 
       For example, clicking this
 link brings you directly to step 44 of 57 in a program that finds
 prime numbers using the Python for-else construct.
      
 
-
      In the future, we plan to create an online authoring environment so
-that you can add annotations, discussion threads, and interactive
+
      In the near future, we plan to add an online authoring environment so
+that you can create annotations, discussion threads, and interactive
 activities on top of your visualizations.
      
 
 
    • 

From b18a86a626e11cd4c60ae5d2b623ca0c0a83a53f Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 12 Sep 2012 00:12:32 -0700
Subject: [PATCH 304/502] more text

---
 v3/index.html | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/v3/index.html b/v3/index.html
index b0326e5b6..2e400895d 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -152,18 +152,18 @@ 
    SHARE visualizations on
 
    To share your current visualization, click the “Generate
 URL” button and paste that URL link in an email, social networking
 post, or forum question. When recipients click on that link, they will
-see that exact visualization. This feature is a more effective way for
-students to seek assistance as opposed to copying-and-pasting code
-snippets.
    
+see your exact visualization. This feature is a more effective way for
+students to seek assistance than copying-and-pasting code snippets.
    
 
 
     For example, clicking this
 link brings you directly to step 44 of 57 in a program that finds
 prime numbers using the Python for-else construct.
    
 
-
    In the near future, we plan to add an online authoring environment so
-that you can create annotations, discussion threads, and interactive
-activities on top of your visualizations.
    
+
    In the near future, we plan to add an online authoring environment so
+that you can save code examples and then create annotations, lessons,
+discussion threads, and interactive activities on top of your
+visualizations.
    
 
 
    
 

From 6ea849c3e586bfb263668d8cdb98ee6385cdc8a3 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 12 Sep 2012 00:15:41 -0700
Subject: [PATCH 305/502] bam

---
 v3/index.html | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/v3/index.html b/v3/index.html
index 2e400895d..dc1ee5a0d 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -81,16 +81,15 @@ 
    LEARN to program in Pyt
 
 
    
 
-
    Over 100,000 people so far have used Online Python Tutor to
-understand and debug their programs, often as a supplement to textbooks,
-lecture notes, and online tutorials.
    
-
-
    Instructors in over a dozen universities such as MIT, UC Berkeley, UC
-Davis, Sonoma State University, the University of Washington, the
-University of Waterloo, the University of Toronto, Luther College, and
-Swarthmore College have adopted it for teaching introductory computer
-science courses.
-
    
+
    Over 100,000 people have used Online Python Tutor to understand and
+debug their programs, often as a supplement to textbooks, lecture notes,
+and online programming tutorials.
    
+
+
    In addition, instructors in over a dozen universities such as MIT, UC
+Berkeley, UC Davis, Sonoma State University, the University of
+Washington, the University of Waterloo, Luther College, and Swarthmore
+College have adopted it for teaching introductory computer science
+courses.
    
 
 
    
 We are actively seeking partnerships with educators at all levels.

From 71074bc52faf14904ece3645ba7c9a5f3b2f65ea Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 12 Sep 2012 00:42:24 -0700
Subject: [PATCH 306/502] minor

---
 README | 58 ++++++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 38 insertions(+), 20 deletions(-)

diff --git a/README b/README
index 8401ea695..b82a158a0 100644
--- a/README
+++ b/README
@@ -23,47 +23,65 @@ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 ======
+Repository contents:
 
 v1-v2/
-  Version 1 - released on January 19, 2010
+
+  Online Python Tutor version 1 - released on January 19, 2010
   "Release" email to 15 friends:
 
   Subject: version 0.0000001alpha of my online Python tutor
-
   Body:
-    '''
-    hi python fans (and non-fans) ...
+  '''
+  hi python fans (and non-fans) ...
 
-    this is what i've been hacking on for the past few days instead of doing my research ;)  i'm planning to use it as a platform for creating interactive online programming tutorials as part of a volunteer project ...
+  this is what i've been hacking on for the past few days instead of
+  doing my research ;)  i'm planning to use it as a platform for
+  creating interactive online programming tutorials as part of a
+  volunteer project ...
 
-    http://python.pgrind.com/
+  http://python.pgrind.com/
 
-    it'd be great to get your feedback on what i have so far.  i'd love to hear suggestions or complaints.  thanks in advance!
+  it'd be great to get your feedback on what i have so far.  i'd love
+  to hear suggestions or complaints.  thanks in advance!
 
-    please don't share this link yet, mostly because my app is still buggy and insecure (i definitely don't want random peoples from the internet trying to hack it right now!)
+  please don't share this link yet, mostly because my app is still
+  buggy and insecure (i definitely don't want random peoples from the
+  internet trying to hack it right now!)
 
-    pg
-    '''
+  pg
+  '''
 
-  Version 2 - released on October 4, 2011
+  Online Python Tutor version 2 - released on October 4, 2011
   "Release" email to 13 friends:
 
+  Subject: Re: version 0.0000001alpha of my online Python tutor
   Body:
-    '''
-    Dear subset of people who cared about my prior email from almost 2 years ago ...
+  '''
+  Dear subset of people who cared about my prior email from almost 2
+  years ago ...
 
-    I've recently kicked it up a notch with a "2.0" version and am about to do a public release soon.  I'd really appreciate any feedback, criticism, and especially bug reports on Internet Explorer ;)
+  I've recently kicked it up a notch with a "2.0" version and am about
+  to do a public release soon.  I'd really appreciate any feedback,
+  criticism, and especially bug reports on Internet Explorer ;)
 
-    http://people.csail.mit.edu/pgbovine/opt-prerelease/
+  http://people.csail.mit.edu/pgbovine/opt-prerelease/
 
-    Please don't share the link yet since it will be dead soon when I move this app to its permanent home.  I just want to get some early feedback to eliminate the obviously embarrassing bugs before launch.
+  Please don't share the link yet since it will be dead soon when I
+  move this app to its permanent home.  I just want to get some early
+  feedback to eliminate the obviously embarrassing bugs before launch.
 
-    THANKS!
+  THANKS!
 
-    pg
-    '''
+  pg
+  '''
 
 
 v3/
-  Version 3 - Released in September 2012
+
+  Version 3 - Released on September ??, 2012
+
+
+Acknowledgments:
+  TODO
 

From e195d5d5674a73b046401b18cace0f23223e4c3b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 12 Sep 2012 00:48:19 -0700
Subject: [PATCH 307/502] applied reset styles!

---
 v3/css/pytutor.css | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 364c79822..b10b2a0c6 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -33,6 +33,18 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
 
+/* reset style to nullify effects of existing stylesheets
+   e.g., http://meyerweb.com/eric/tools/css/reset/
+*/
+div.ExecutionVisualizer {
+  background-color: white;
+  line-height: 1;
+  margin: 0;
+  padding: 0;
+  border: 0;
+  font-size: 100%;
+}
+
 div.ExecutionVisualizer table.visualizer {
   font-family: verdana, arial, helvetica, sans-serif;
   font-size: 10pt;

From 7fba131717da6dbf92c71bb5e168f70e174fdcdc Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 12 Sep 2012 00:55:59 -0700
Subject: [PATCH 308/502] bah

---
 v3/css/index.css   | 5 ++++-
 v3/css/pytutor.css | 9 ++-------
 2 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/v3/css/index.css b/v3/css/index.css
index 6ddc27098..1280e1ccc 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -3,7 +3,6 @@
 body {
   background-color: white;
 
-  line-height: 1.5;  /* slightly more than single spacing, for prose text */
   font-family: Georgia, Palatino, Times, serif;
 
   font-size: 12pt;
@@ -13,6 +12,10 @@ body {
   margin-right: auto;
 }
 
+/* for prose text only */
+p, li {
+  line-height: 1.5;
+}
 
 h1 {
   font-weight: normal;
diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index b10b2a0c6..b31d4c925 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -33,16 +33,11 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
 
-/* reset style to nullify effects of existing stylesheets
+/* reset some styles to nullify effects of existing stylesheets
    e.g., http://meyerweb.com/eric/tools/css/reset/
 */
 div.ExecutionVisualizer {
-  background-color: white;
-  line-height: 1;
-  margin: 0;
-  padding: 0;
-  border: 0;
-  font-size: 100%;
+  /* none for now */
 }
 
 div.ExecutionVisualizer table.visualizer {

From 61a4c20a95878520359ae297b19cb32bb1e92388 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 12 Sep 2012 01:03:18 -0700
Subject: [PATCH 309/502] teeny

---
 v3/css/index.css | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/v3/css/index.css b/v3/css/index.css
index 1280e1ccc..8fbda305c 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -21,6 +21,7 @@ h1 {
   font-weight: normal;
   margin-top: 0px;
   margin-bottom: 8px;
+  line-height: 1.5;
 }
 
 .smallH1 {
@@ -112,7 +113,7 @@ div#learnPane p {
 div#learnPane #startLink {
   font-size: 16pt;
   font-weight: normal;
-  margin-top: 10px;
+  margin-top: 20px;
   margin-bottom: 20px;
   font-family: verdana, arial, helvetica, sans-serif;
 }

From 827983648fab0889eb84841afff9743ca3b53eff Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 12 Sep 2012 07:22:06 -0700
Subject: [PATCH 310/502] bamm

---
 v3/css/index.css |  6 ++----
 v3/index.html    | 22 ++++++++++++----------
 2 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/v3/css/index.css b/v3/css/index.css
index 8fbda305c..7639ca8ea 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -171,16 +171,14 @@ table.layoutTbl {
   max-width: 900px;
 }
 
-table.layoutTbl td {
-  vertical-align: top;
-}
-
 table.layoutTbl td#embedPaneTd {
   width: 60%;
+  vertical-align: top;
 }
 
 table.layoutTbl td#sharePaneTd {
   width: 40%;
+  vertical-align: top;
 }
 
 
diff --git a/v3/index.html b/v3/index.html
index dc1ee5a0d..4147d390a 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -93,7 +93,7 @@ 
    LEARN to program in Pyt
 
 
    
 We are actively seeking partnerships with educators at all levels.
-Email philip@pythontutor.com if you are interested.
+Please email philip@pythontutor.com if you are interested.
 
    
 
 
    
@@ -173,14 +173,11 @@ 
    SHARE visualizations on
 More Details:
 
      
 
-  
    • Online Python Tutor supports Python 2.7 and 3.2 with limited module
-  imports and no file I/O, hosted on either a CGI-capable server or on
-  Google App
-  Engine
+  
    • Online Python Tutor supports Python 2.7 and 3.2, hosted on either
+  a CGI-capable web server or on Google App Engine
 
-  
    • BSD-licensed source code available on GitHub
-
-  
    • Main technologies: Python Main technologies: Python bdb debugger
   framework for execution trace generation, D3.js for data mapping and
@@ -188,6 +185,13 @@ 
      SHARE visualizations on
   graphical arrow rendering, and CodeMirror for syntax highlighting
 
+  
    • Free, open-source BSD-licensed code on GitHub
+
+  
    • Want to help out? We have ideas that might interest students
+  seeking a thesis project or anyone who loves to hack. Email
+  philip@pythontutor.com to learn more.
+ 
 
    
 
    
 
@@ -209,8 +213,6 @@ 
    SHARE visualizations on
 href="https://groups.google.com/forum/#!forum/pythontutor-announce">pythontutor-announce
 to receive occasional announcements.
    
 
-
    To privately report bugs, suggestions, or feature requests, email philip@pythontutor.com
    
-
 
    Copyright © 2010-2012 Philip Guo. All rights reserved.
    
 
 
    

From 94db9c8e21bc5cbfca9c24e19496e1a91554259a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 12 Sep 2012 07:25:00 -0700
Subject: [PATCH 311/502] sweating details

---
 v3/css/pytutor.css | 1 +
 1 file changed, 1 insertion(+)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index b31d4c925..86c0640be 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -78,6 +78,7 @@ div.ExecutionVisualizer table#pyCodeOutput {
 /* don't wrap lines within code output ... FORCE scrollbars to appear */
 div.ExecutionVisualizer table#pyCodeOutput td {
   white-space: nowrap;
+  vertical-align: middle; /* explicitly force, to override external CSS conflicts */
 }
 
 div.ExecutionVisualizer #leftCodeGutterSVG {

From a1892a54bc4fbe022a1a478a2da3760089651177 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 12 Sep 2012 07:27:18 -0700
Subject: [PATCH 312/502] minor

---
 v3/css/index.css | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/css/index.css b/v3/css/index.css
index 7639ca8ea..ca3edf737 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -187,7 +187,7 @@ table.layoutTbl td#sharePaneTd {
   font-size: 9pt;
   border-top: 1px solid #bbbbbb;
   padding-top: 0px;
-  margin-top: 30px;
+  margin-top: 20px;
 
   /* center align */
   margin-left: auto;

From 30fc8034e79aaaeeb0693312b6a0c7e09d5ea774 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 12 Sep 2012 08:03:59 -0700
Subject: [PATCH 313/502] bam

---
 v3/index.html | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/v3/index.html b/v3/index.html
index 4147d390a..24bfa5118 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -53,11 +53,6 @@
 
 
 
-
 
 
    
 
@@ -177,13 +172,13 @@ 
    SHARE visualizations on
   a CGI-capable web server or on Google App Engine
 
- 
  • Main technologies: Python bdb debugger
-  framework for execution trace generation, D3.js for data mapping and
-  visualization, jsPlumb for
-  graphical arrow rendering, and CodeMirror for syntax highlighting
+ 
  • Main technologies: Python with bdb for the
+ backend; HTML/CSS/JavaScript with jQuery, D3.js, jsPlumb, and CodeMirror for the frontend
 
   
  • Free, open-source BSD-licensed code on GitHub

From f2e70b4230373dbb4c070a53d7d6df317515e88a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 12 Sep 2012 15:17:11 -0700
Subject: [PATCH 314/502] minor tweaks

---
 README                       | 18 ++++++++++++++++++
 v3/docs/embedding-HOWTO.txt  |  4 ++++
 v3/docs/opt-trace-format.txt |  5 +++++
 v3/index.html                |  8 ++++----
 v3/js/index.js               |  2 +-
 5 files changed, 32 insertions(+), 5 deletions(-)
 create mode 100644 v3/docs/embedding-HOWTO.txt
 create mode 100644 v3/docs/opt-trace-format.txt

diff --git a/README b/README
index b82a158a0..a99e89665 100644
--- a/README
+++ b/README
@@ -23,8 +23,24 @@ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 ======
+
+Summary:
+ 
+  Online Python Tutor (located at pythontutor.com) enables teachers and
+  students to write Python programs directly in the web browser, execute
+  those programs, and then step forwards and backwards through execution
+  to view the run-time state of data structures.
+
+  Over 100,000 people have used Online Python Tutor to understand and
+  debug their programs, often as a supplement to textbooks, lecture
+  notes, and online programming tutorials.
+
+---
+
 Repository contents:
 
+  tl;dr: the v3/ sub-directory contains the latest version of the code.
+
 v1-v2/
 
   Online Python Tutor version 1 - released on January 19, 2010
@@ -82,6 +98,8 @@ v3/
   Version 3 - Released on September ??, 2012
 
 
+---
+
 Acknowledgments:
   TODO
 
diff --git a/v3/docs/embedding-HOWTO.txt b/v3/docs/embedding-HOWTO.txt
new file mode 100644
index 000000000..16bae366d
--- /dev/null
+++ b/v3/docs/embedding-HOWTO.txt
@@ -0,0 +1,4 @@
+Instructions for embedding Online Python Tutor visualizations
+------
+
+[Full documentation coming soon! For now, please email philip@pythontutor.com]
diff --git a/v3/docs/opt-trace-format.txt b/v3/docs/opt-trace-format.txt
new file mode 100644
index 000000000..c65b4098b
--- /dev/null
+++ b/v3/docs/opt-trace-format.txt
@@ -0,0 +1,5 @@
+Online Python Tutor execution trace format
+------
+
+[TODO: write me!]
+
diff --git a/v3/index.html b/v3/index.html
index 24bfa5118..340dfb769 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -111,7 +111,7 @@ 
    LEARN to program in Pyt
 
 
    EMBED visualizations in digital textbooks
    
 
-
    Using just one line of JavaScript code, you can embed an Online
+
    Using just one line of JavaScript code, you can embed an Online
 Python Tutor visualization within your web page. For example, the
 HTML textbook for the introductory CS course at UC Berkeley (CS61A) contains
@@ -183,9 +183,9 @@ 
    SHARE visualizations on
   
  • Free, open-source BSD-licensed code on GitHub
 
-  
  • Want to help out? We have ideas that might interest students
-  seeking a thesis project or anyone who loves to hack. Email
-  philip@pythontutor.com to learn more.
+  
  • Want to help out? We have ideas for student thesis projects or
+  for anyone else who loves to hack. Email philip@pythontutor.com for
+  more info.
  
 
 
    
diff --git a/v3/js/index.js b/v3/js/index.js
index 45daad561..66fd49dd7 100644
--- a/v3/js/index.js
+++ b/v3/js/index.js
@@ -1,4 +1,4 @@
-var demoTrace = {"code": "myList = (1, (2, (3, None)))\n\ndef listSum(n):\n  if not n:\n    return 0\n  else:\n    return n[0]+listSum(n[1])\n\ntotal = listSum(myList)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 1, "event": "step_line"}, {"ordered_globals": ["myList"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"myList": ["REF", 1]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["myList", "listSum"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"myList": ["REF", 1], "listSum": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "listSum(n)", null]}, "line": 9, "event": "step_line"}, {"ordered_globals": ["myList", "listSum"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "listSum": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "listSum(n)", null]}, "line": 3, "event": "call"}, {"ordered_globals": ["myList", "listSum"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "listSum": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "listSum(n)", null]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["myList", "listSum"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "listSum": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "listSum(n)", null]}, "line": 7, "event": "step_line"}, {"ordered_globals": ["myList", "listSum"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "listSum": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "listSum(n)", null]}, "line": 3, "event": "call"}, {"ordered_globals": ["myList", "listSum"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "listSum": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "listSum(n)", null]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["myList", "listSum"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"n": ["REF", 1]}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["n"]}, {"frame_id": 2, "encoded_locals": {"n": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["n"]}], "globals": {"myList": ["REF", 1], "listSum": ["REF", 4]}, "heap": {"1": ["TUPLE", 1, ["REF", 2]], "2": ["TUPLE", 2, ["REF", 3]], "3": ["TUPLE", 3, null], "4": ["FUNCTION", "listSum(n)", null]}, "line": 7, "event": "step_line"}, {"ordered_globals": ["myList", "listSum"], "stdout": "", "func_name": "listSum", 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From 73c89e2c782f9feef21289160ab005e6197e5a52 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 12 Sep 2012 15:46:41 -0700
Subject: [PATCH 315/502] added favicon from python.org

---
 v3/favicon | Bin 0 -> 15086 bytes
 1 file changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 v3/favicon

diff --git a/v3/favicon b/v3/favicon
new file mode 100644
index 0000000000000000000000000000000000000000..c9efc5844a2627a8474949724a2aefe4ab2baee4
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z`+|~zI`H{u%hP;^r8Y9SFW>Vb_-|R565W%1QuOE`1MCR>T4_fMw3upeE;NQOB#-uB
zJPc(|Q!fKCzF^=k?6)gDcz!GUoW!}CflLR|;!C9rv?HzW&i4--&joolyT~u}xwfj=
z>f#GvCE^)kOF9`8#;2FTtLS1b?(Gb^9b_s_kDtaqt+XQpU#M+0m}-Jms*MBb@w@8e3#w+*-mzk@%(3p2c4TlasFb4*>^P;)mLkj*rTupuW9>_v#Bk&e+WNxH;9s9#{K8q?
z=_0>CeZZWCf5&y*xq2goDa89CD%UQ|cvk$ld#N~CkSTIgpOF|$ed+@3YZTTY9&XRa9M`>(pQQ|`LzdGQBz{rPTpN7_
z^FI=N*^^*C)2RFIO#Zz2(Zg~U#4gX7A6=aNZj>4Li^T}bLw})k{fuBU`XZY$r}!^i
z{e~~!qhT)7AihN}g)47^^rcD-HTJtKU^)l}Cj9%FUU
Date: Wed, 12 Sep 2012 16:18:26 -0700
Subject: [PATCH 316/502] updated email addr

---
 v3/docs/embedding-HOWTO.txt | 2 +-
 v3/index.html               | 4 ++--
 v3/tutor.html               | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/v3/docs/embedding-HOWTO.txt b/v3/docs/embedding-HOWTO.txt
index 16bae366d..de83d1b72 100644
--- a/v3/docs/embedding-HOWTO.txt
+++ b/v3/docs/embedding-HOWTO.txt
@@ -1,4 +1,4 @@
 Instructions for embedding Online Python Tutor visualizations
 ------
 
-[Full documentation coming soon! For now, please email philip@pythontutor.com]
+[Full documentation coming soon! For now, please email philip@pgbovine.net]
diff --git a/v3/index.html b/v3/index.html
index 340dfb769..20275849f 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -88,7 +88,7 @@ 
    LEARN to program in Pyt
 
 
    
 We are actively seeking partnerships with educators at all levels.
-Please email philip@pythontutor.com if you are interested.
+Please email philip@pgbovine.net if you are interested.
 
    
 
 
    
@@ -184,7 +184,7 @@ 
    SHARE visualizations on
   href="https://github.com/pgbovine/OnlinePythonTutor/">GitHub
 
   
  • Want to help out? We have ideas for student thesis projects or
-  for anyone else who loves to hack. Email philip@pythontutor.com for
+  for anyone else who loves to hack. Email philip@pgbovine.net for
   more info.
  
 
diff --git a/v3/tutor.html b/v3/tutor.html
index ef51d79a5..0665fbd54 100644
--- a/v3/tutor.html
+++ b/v3/tutor.html
@@ -170,7 +170,7 @@
 
 
    To report a bug, click the 'Generate URL' button, paste the URL along
 with a brief error description in an email, and send the email to
-philip@pythontutor.com
+philip@pgbovine.net
 
    
 
 
    Join the 
Date: Wed, 12 Sep 2012 16:43:19 -0700
Subject: [PATCH 317/502] renam

---
 v3/{favicon => favicon.ico} | Bin
 1 file changed, 0 insertions(+), 0 deletions(-)
 rename v3/{favicon => favicon.ico} (100%)

diff --git a/v3/favicon b/v3/favicon.ico
similarity index 100%
rename from v3/favicon
rename to v3/favicon.ico

From 7a54fadebf6f2b825f50d4098e7f66496a001a46 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 12 Sep 2012 16:48:08 -0700
Subject: [PATCH 318/502] change tutor.html -> visualize.html

---
 v3/css/opt-frontend.css           | 2 +-
 v3/index.html                     | 6 +++---
 v3/js/index.js                    | 2 +-
 v3/pythontutor.py                 | 2 +-
 v3/{tutor.html => visualize.html} | 0
 5 files changed, 6 insertions(+), 6 deletions(-)
 rename v3/{tutor.html => visualize.html} (100%)

diff --git a/v3/css/opt-frontend.css b/v3/css/opt-frontend.css
index bb02dace3..6f2953680 100644
--- a/v3/css/opt-frontend.css
+++ b/v3/css/opt-frontend.css
@@ -1,4 +1,4 @@
-/* CSS accompanying ../tutor.html */
+/* CSS accompanying ../visualize.html */
 
 h1 {
   font-weight: normal;
diff --git a/v3/index.html b/v3/index.html
index 20275849f..ec34a815f 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -64,7 +64,7 @@
 
 
    LEARN to program in Python by writing code and visualizing execution
    
 
-
    Online Python Tutor
+
    Online Python Tutor
 enables teachers and students to write Python programs directly in the web
 browser, execute those programs, and then step forwards and backwards
@@ -94,7 +94,7 @@ 
    LEARN to program in Pyt
 
    
 
 
 
 
    • 
@@ -150,7 +150,7 @@ 
    SHARE visualizations on
 students to seek assistance than copying-and-pasting code snippets.
    
 
 
     For example, clicking this
+href="visualize.html#code=%23+find+primes+using+a+for-else+construct%0Afor+n+in+range(2,+10)%3A%0A++++x_range+%3D+range(2,+n)%0A++++for+x+in+x_range%3A%0A++++++++if+n+%25+x+%3D%3D+0%3A%0A++++++++++++break%0A++++else%3A%0A++++++++%23+loop+fell+through+without+finding+a+factor%0A++++++++print(n)&curInstr=43&mode=visualize&cumulative_mode=false&python_version=2">this
 link brings you directly to step 44 of 57 in a program that finds
 prime numbers using the Python for-else construct.
    
 
diff --git a/v3/js/index.js b/v3/js/index.js
index 66fd49dd7..3747abd66 100644
--- a/v3/js/index.js
+++ b/v3/js/index.js
@@ -6,7 +6,7 @@ $(document).ready(function() {
   $(".activityPane").corner('15px');
 
   var demoViz = new ExecutionVisualizer('demoViz', demoTrace, {embeddedMode: true,
-                                                               editCodeBaseURL: 'tutor.html'});
+                                                               editCodeBaseURL: 'visualize.html'});
 
   // redraw connector arrows on window resize
   $(window).resize(function() {
diff --git a/v3/pythontutor.py b/v3/pythontutor.py
index 3bb731160..be76d4b1e 100644
--- a/v3/pythontutor.py
+++ b/v3/pythontutor.py
@@ -44,7 +44,7 @@ class TutorPage(webapp2.RequestHandler):
 
   def get(self):
     self.response.headers['Content-Type'] = 'text/html'
-    template = JINJA_ENVIRONMENT.get_template('tutor.html')
+    template = JINJA_ENVIRONMENT.get_template('visualize.html')
     self.response.out.write(template.render())
 
 
diff --git a/v3/tutor.html b/v3/visualize.html
similarity index 100%
rename from v3/tutor.html
rename to v3/visualize.html

From 0ff03e57e7aafaa710cec2aeb52e0c1b9be67b3b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 12 Sep 2012 19:05:27 -0700
Subject: [PATCH 319/502] sometimes highlighting is buggy on Safari, so nix it

---
 v3/js/pytutor.js | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index a7990285d..09aac3bc5 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -1693,6 +1693,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   // Render globals and then stack frames using d3:
 
 
+  // TODO: this sometimes seems buggy on Safari, so nix it for now:
   function highlightAliasedConnectors(d, i) {
     // if this row contains a stack pointer, then highlight its arrow and
     // ALL aliases that also point to the same heap object
@@ -1752,8 +1753,6 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   // ENTER
   globalsD3.enter()
     .append('tr')
-    .on('mouseover', highlightAliasedConnectors)
-    .on('mouseout',  unhighlightAllConnectors)
     .selectAll('td.stackFrameVar,td.stackFrameValue')
     .data(function(d, i){return d;}) /* map varname down both columns */
     .enter()
@@ -1898,9 +1897,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   stackVarTable
     .enter()
-    .append('tr')
-    .on('mouseover', highlightAliasedConnectors)
-    .on('mouseout',  unhighlightAllConnectors);
+    .append('tr');
  
 
   var stackVarTableCells = stackVarTable

From d56607488547b18b18e4be5587d745d179771c32 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 12 Sep 2012 23:47:28 -0700
Subject: [PATCH 320/502] minor

---
 README | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/README b/README
index a99e89665..c4957c3ac 100644
--- a/README
+++ b/README
@@ -26,10 +26,10 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 Summary:
  
-  Online Python Tutor (located at pythontutor.com) enables teachers and
-  students to write Python programs directly in the web browser, execute
-  those programs, and then step forwards and backwards through execution
-  to view the run-time state of data structures.
+  Online Python Tutor enables teachers and students to write Python
+  programs directly in the web browser, execute those programs, and then
+  step forwards and backwards through execution to view the run-time
+  state of data structures.
 
   Over 100,000 people have used Online Python Tutor to understand and
   debug their programs, often as a supplement to textbooks, lecture

From 723b370933b71d7b902937b5f6960962277561a5 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 13 Sep 2012 09:43:11 -0700
Subject: [PATCH 321/502] eliminated "About to run"

---
 v3/css/pytutor.css | 4 ++--
 v3/js/pytutor.js   | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 86c0640be..1898d1f5f 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -146,8 +146,8 @@ div.ExecutionVisualizer #vcrControls {
 }
 
 div.ExecutionVisualizer #vcrControls button {
-  margin-left: 3px;
-  margin-right: 3px;
+  margin-left: 4px;
+  margin-right: 4px;
 }
 
 div.ExecutionVisualizer #pyStdout {
diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 09aac3bc5..a8e066dfa 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -819,7 +819,7 @@ ExecutionVisualizer.prototype.updateOutput = function(smoothTransition) {
     }
   }
   else {
-    vcrControls.find("#curInstr").html("About to run step " +
+    vcrControls.find("#curInstr").html("Step " +
                                        String(this.curInstr + 1) +
                                        " of " + String(totalInstrs-1));
   }

From a92b904757ad76a53a7e7907bf53a868e1859947 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 13 Sep 2012 09:47:14 -0700
Subject: [PATCH 322/502] more space tweaks

---
 v3/css/pytutor.css | 5 +++++
 v3/js/pytutor.js   | 4 ++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 1898d1f5f..ec6772eb5 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -146,6 +146,11 @@ div.ExecutionVisualizer #vcrControls {
 }
 
 div.ExecutionVisualizer #vcrControls button {
+  margin-left: 2px;
+  margin-right: 2px;
+}
+
+div.ExecutionVisualizer #vcrControls #curInstr {
   margin-left: 4px;
   margin-right: 4px;
 }
diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index a8e066dfa..9bfa9f887 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -809,13 +809,13 @@ ExecutionVisualizer.prototype.updateOutput = function(smoothTransition) {
 
   var vcrControls = myViz.domRoot.find("#vcrControls");
 
-  // to be user-friendly, if we're on the LAST instruction, print "Program has terminated"
+  // to be user-friendly, if we're on the LAST instruction, print "Program terminated"
   if (isLastInstr) {
     if (this.instrLimitReached) {
       vcrControls.find("#curInstr").html("Instruction limit reached");
     }
     else {
-      vcrControls.find("#curInstr").html("Program has terminated");
+      vcrControls.find("#curInstr").html("Program terminated");
     }
   }
   else {

From 8a15992168d67e5b82a8537f6d228075eadc4947 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 13 Sep 2012 18:42:09 -0700
Subject: [PATCH 323/502] gray out return value display in zombie frames

---
 v3/css/pytutor.css | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index ec6772eb5..6c7dda325 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -185,9 +185,12 @@ div.ExecutionVisualizer .funcObj {
 
 div.ExecutionVisualizer .retval {
   font-size: 9pt;
-  color: #e93f34; /* should match brightRed JavaScript variable */
 }
 
+div.ExecutionVisualizer .stackFrame .retval {
+  color: #e93f34; /* highlight non-zombie stack frame return values -
+                     should match brightRed JavaScript variable */
+}
 
 /* Rendering of basic compound types */
 

From 0fb66ec5032c1a07f1e7ba687ea88031a9ac7ace Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 13 Sep 2012 22:37:13 -0700
Subject: [PATCH 324/502] added acknowledgments

---
 README | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/README b/README
index c4957c3ac..563673bad 100644
--- a/README
+++ b/README
@@ -100,6 +100,22 @@ v3/
 
 ---
 
-Acknowledgments:
-  TODO
+Special thanks to ...
+
+John Dalbey
+John DeNero
+Michael Ernst
+David Evans
+Paul Gries
+Adam Hartz
+Tomas Lozano-Perez
+Bertram Ludaescher
+Brad Miller
+Rob Miller
+Peter Norvig
+Andrew Petersen
+David Pritchard
+Suzanne Rivoire
+Peter Wentworth
+David Wilkins
 

From 6e943a39571063026fb4a9d43f4e950284f42b99 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 14 Sep 2012 10:24:52 -0700
Subject: [PATCH 325/502] minor copyediting changes

---
 v3/index.html | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/v3/index.html b/v3/index.html
index ec34a815f..2eb13283a 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -111,11 +111,13 @@ 
    LEARN to program in Pyt
 
 
    EMBED visualizations in digital textbooks
    
 
-
    Using just one line of JavaScript code, you can embed an Online
-Python Tutor visualization within your web page. For example, the
-HTML textbook for the introductory CS course at UC Berkeley (CS61A) contains
-dozens of embedded visualizations:
+
    Using a single line of JavaScript code, you can embed an Online Python Tutor
+visualization within your web page (as shown in the “Learn”
+box above).  The author of the HTML textbook for the introductory CS
+course at UC Berkeley (CS61A) has embedded
+dozens of such visualizations, as shown in this screenshot:
 
 
    
 
@@ -124,8 +126,8 @@ 
    EMBED visualizations in
 
 
    
 
-Similar visualizations have also been embedded within two other
-web-based digital Python textbook projects: How
 to Think Like a Computer Scientist: Interactive Edition and Computer Science Circles.

From 4e81c38e216cd9e1bc3acdfca489383a2cdca44a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 14 Sep 2012 11:04:22 -0700
Subject: [PATCH 326/502] started cleaning up URL hashes

---
 v3/js/opt-frontend.js | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index b2ac77f57..b989d03fc 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -38,7 +38,7 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 var python2_backend_script = 'exec';
 var python3_backend_script = null;
 
-var appMode = 'edit'; // 'edit' or 'visualize'
+var appMode = 'edit'; // 'edit' or 'display'
 
 var preseededCode = null;     // if you passed in a 'code=' in the URL, then set this var
 var preseededCurInstr = null; // if you passed in a 'curInstr=' in the URL, then set this var
@@ -89,25 +89,25 @@ $(document).ready(function() {
 
 
     // ugh, ugly tristate due to the possibility of being undefined :)
-    if ($.bbq.getState('cumulative_mode') == 'true') {
+    if ($.bbq.getState('cumulative') == 'true') {
       $('#cumulativeModeSelector').val('yes');
     }
-    else if ($.bbq.getState('cumulative_mode') == 'false') {
+    else if ($.bbq.getState('cumulative') == 'false') {
       $('#cumulativeModeSelector').val('no');
     }
     // else if it's undefined, don't do anything ...
 
-    if ($.bbq.getState('python_version') == '3') {
+    if ($.bbq.getState('py') == '3') {
       $('#pythonVersionSelector').val('3');
     }
-    else if ($.bbq.getState('python_version') == '2') {
+    else if ($.bbq.getState('py') == '2') {
       $('#pythonVersionSelector').val('2');
     }
     // else if it's undefined, don't do anything ...
 
 
     // only bother with curInstr when we're visualizing ...
-    if (!preseededCurInstr && preseededMode == 'visualize') { // TODO: kinda gross hack
+    if (!preseededCurInstr && preseededMode == 'display') { // TODO: kinda gross hack
       preseededCurInstr = Number($.bbq.getState('curInstr'));
     }
 
@@ -121,11 +121,11 @@ $(document).ready(function() {
     if (!myVisualizer) {
       appMode = 'edit';
 
-      if (preseededCode && preseededMode == 'visualize') {
+      if (preseededCode && preseededMode == 'display') {
         // punt for now ...
       }
       else {
-        $.bbq.pushState({ mode: 'edit' }, 2 /* completely override other hash strings to keep URL clean */);
+        //$.bbq.pushState({ mode: 'edit' }, 2 /* completely override other hash strings to keep URL clean */);
       }
     }
 
@@ -134,7 +134,7 @@ $(document).ready(function() {
       $("#pyInputPane").show();
       $("#pyOutputPane").hide();
     }
-    else if (appMode == 'visualize') {
+    else if (appMode == 'display') {
       $("#pyInputPane").hide();
       $("#pyOutputPane").show();
 
@@ -261,7 +261,7 @@ $(document).ready(function() {
               // also scroll to top to make the UI more usable on smaller monitors
               $(document).scrollTop(0);
 
-              $.bbq.pushState({ mode: 'visualize' }, 2 /* completely override other hash strings to keep URL clean */);
+              $.bbq.pushState({ mode: 'display' });
             }
           },
           "json");
@@ -510,7 +510,7 @@ $(document).ready(function() {
 
   // redraw connector arrows on window resize
   $(window).resize(function() {
-    if (appMode == 'visualize') {
+    if (appMode == 'display') {
       myVisualizer.redrawConnectors();
     }
   });
@@ -518,12 +518,12 @@ $(document).ready(function() {
   $('#genUrlBtn').bind('click', function() {
     var urlStr = $.param.fragment(window.location.href,
                                   {code: pyInputCodeMirror.getValue(),
-                                   curInstr: (appMode == 'visualize') ? myVisualizer.curInstr : 0,
+                                   curInstr: (appMode == 'display') ? myVisualizer.curInstr : 0,
                                    mode: appMode,
-                                   cumulative_mode: ($('#cumulativeModeSelector').val() == 'yes'),
-                                   python_version: $('#pythonVersionSelector').val()
+                                   cumulative: ($('#cumulativeModeSelector').val() == 'yes'),
+                                   py: $('#pythonVersionSelector').val()
                                   },
-                                  2);
+                                  2 /* clobber all */);
     $('#urlOutput').val(urlStr);
   });
 });

From 1ae48553f98bd59127d32af01b88422569123ead Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 14 Sep 2012 12:01:51 -0700
Subject: [PATCH 327/502] more cleanups of dubious quality

---
 v3/js/opt-frontend.js | 26 ++++++++++++++------------
 v3/visualize.html     |  4 ++--
 2 files changed, 16 insertions(+), 14 deletions(-)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index b989d03fc..d1ac8c4a9 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -90,10 +90,10 @@ $(document).ready(function() {
 
     // ugh, ugly tristate due to the possibility of being undefined :)
     if ($.bbq.getState('cumulative') == 'true') {
-      $('#cumulativeModeSelector').val('yes');
+      $('#cumulativeModeSelector').val('true');
     }
     else if ($.bbq.getState('cumulative') == 'false') {
-      $('#cumulativeModeSelector').val('no');
+      $('#cumulativeModeSelector').val('false');
     }
     // else if it's undefined, don't do anything ...
 
@@ -125,7 +125,7 @@ $(document).ready(function() {
         // punt for now ...
       }
       else {
-        //$.bbq.pushState({ mode: 'edit' }, 2 /* completely override other hash strings to keep URL clean */);
+        $.bbq.pushState({ mode: 'edit' }, 2 /* completely override other hash strings to keep URL clean */);
       }
     }
 
@@ -187,7 +187,7 @@ $(document).ready(function() {
 
     $.get(backend_script,
           {user_script : pyInputCodeMirror.getValue(),
-           cumulative_mode: ($('#cumulativeModeSelector').val() == 'yes')},
+           cumulative_mode: ($('#cumulativeModeSelector').val() == 'true') /* ugh types! */},
           function(dataFromBackend) {
             var trace = dataFromBackend.trace;
             
@@ -516,14 +516,16 @@ $(document).ready(function() {
   });
 
   $('#genUrlBtn').bind('click', function() {
-    var urlStr = $.param.fragment(window.location.href,
-                                  {code: pyInputCodeMirror.getValue(),
-                                   curInstr: (appMode == 'display') ? myVisualizer.curInstr : 0,
-                                   mode: appMode,
-                                   cumulative: ($('#cumulativeModeSelector').val() == 'yes'),
-                                   py: $('#pythonVersionSelector').val()
-                                  },
-                                  2 /* clobber all */);
+    var myArgs = {code: pyInputCodeMirror.getValue(),
+                  mode: appMode,
+                  cumulative: $('#cumulativeModeSelector').val(),
+                  py: $('#pythonVersionSelector').val()};
+
+    if (appMode == 'display') {
+      myArgs.curInstr = myVisualizer.curInstr;
+    }
+
+    var urlStr = $.param.fragment(window.location.href, myArgs, 2 /* clobber all */);
     $('#urlOutput').val(urlStr);
   });
 });
diff --git a/v3/visualize.html b/v3/visualize.html
index 0665fbd54..adf720106 100644
--- a/v3/visualize.html
+++ b/v3/visualize.html
@@ -73,8 +73,8 @@
   
 and
   
 
    
 

From 00f4ed24fd7c063bb8bcd399990f4ed2a11be2df Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 14 Sep 2012 12:12:05 -0700
Subject: [PATCH 328/502] more dubious hash cleanups

---
 v3/js/opt-frontend.js | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index d1ac8c4a9..da76dff32 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -84,26 +84,22 @@ $(document).ready(function() {
   $(window).bind("hashchange", function(e) {
     appMode = $.bbq.getState('mode'); // assign this to the GLOBAL appMode
 
+    console.log('hashchange:', appMode);
+
     preseededCode = $.bbq.getState('code'); // yuck, global!
     var preseededMode = $.bbq.getState('mode');
 
 
     // ugh, ugly tristate due to the possibility of being undefined :)
-    if ($.bbq.getState('cumulative') == 'true') {
-      $('#cumulativeModeSelector').val('true');
-    }
-    else if ($.bbq.getState('cumulative') == 'false') {
-      $('#cumulativeModeSelector').val('false');
+    var cumulativeState = $.bbq.getState('cumulative');
+    if (cumulativeState !== undefined) {
+      $('#cumulativeModeSelector').val(cumulativeState);
     }
-    // else if it's undefined, don't do anything ...
 
-    if ($.bbq.getState('py') == '3') {
-      $('#pythonVersionSelector').val('3');
-    }
-    else if ($.bbq.getState('py') == '2') {
-      $('#pythonVersionSelector').val('2');
+    var pyState = $.bbq.getState('py');
+    if (pyState !== undefined) {
+      $('#pythonVersionSelector').val(pyState);
     }
-    // else if it's undefined, don't do anything ...
 
 
     // only bother with curInstr when we're visualizing ...
@@ -187,7 +183,7 @@ $(document).ready(function() {
 
     $.get(backend_script,
           {user_script : pyInputCodeMirror.getValue(),
-           cumulative_mode: ($('#cumulativeModeSelector').val() == 'true') /* ugh types! */},
+           cumulative_mode: $('#cumulativeModeSelector').val()},
           function(dataFromBackend) {
             var trace = dataFromBackend.trace;
             

From d39b492596a46e93ea30a8c924db99a5500e8669 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 14 Sep 2012 12:17:00 -0700
Subject: [PATCH 329/502] more subtleties

---
 v3/js/opt-frontend.js | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index da76dff32..22b3cfa91 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -84,7 +84,7 @@ $(document).ready(function() {
   $(window).bind("hashchange", function(e) {
     appMode = $.bbq.getState('mode'); // assign this to the GLOBAL appMode
 
-    console.log('hashchange:', appMode);
+    //console.log('hashchange:', appMode);
 
     preseededCode = $.bbq.getState('code'); // yuck, global!
     var preseededMode = $.bbq.getState('mode');
@@ -113,16 +113,9 @@ $(document).ready(function() {
     }
 
     // if there's no myVisualizer, then default to edit mode since there's
-    // nothing to visualize:
+    // nothing to visualize yet:
     if (!myVisualizer) {
       appMode = 'edit';
-
-      if (preseededCode && preseededMode == 'display') {
-        // punt for now ...
-      }
-      else {
-        $.bbq.pushState({ mode: 'edit' }, 2 /* completely override other hash strings to keep URL clean */);
-      }
     }
 
 
@@ -257,7 +250,7 @@ $(document).ready(function() {
               // also scroll to top to make the UI more usable on smaller monitors
               $(document).scrollTop(0);
 
-              $.bbq.pushState({ mode: 'display' });
+              $.bbq.pushState({ mode: 'display' }, 2 /* completely override other hash strings to keep URL clean */);
             }
           },
           "json");

From 9862ab533571919eb7d543300c5387058483aedd Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 14 Sep 2012 12:29:17 -0700
Subject: [PATCH 330/502] bam

---
 v3/js/opt-frontend.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 22b3cfa91..0dcb1fc01 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -478,7 +478,7 @@ $(document).ready(function() {
   if (preseededCode) {
     setCodeMirrorVal(preseededCode);
 
-    if ($.bbq.getState('mode') != 'edit') {
+    if ($.bbq.getState('mode') == 'display') {
       $("#executeBtn").trigger('click');
     }
   }

From a617727a18829fec557362cb586c9cfd380750bf Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 14 Sep 2012 12:32:49 -0700
Subject: [PATCH 331/502] teeny

---
 v3/js/opt-frontend.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 0dcb1fc01..fd60d06df 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -108,7 +108,7 @@ $(document).ready(function() {
     }
 
     // default mode is 'edit'
-    if (appMode == undefined) {
+    if (appMode === undefined) {
       appMode = 'edit';
     }
 
@@ -144,6 +144,8 @@ $(document).ready(function() {
     else {
       assert(false);
     }
+
+    $('#urlOutput').val(''); // clear to avoid stale values
   });
 
   // From: http://benalman.com/projects/jquery-bbq-plugin/

From b0b461f2a90a3d2e36e463721bb525b7a1ed5891 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 14 Sep 2012 16:12:06 -0700
Subject: [PATCH 332/502] tweaks

---
 v3/index.html | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/v3/index.html b/v3/index.html
index 2eb13283a..4f4bc59f7 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -114,10 +114,10 @@ 
    EMBED visualizations in
 
    Using a single line of JavaScript code, you can embed an Online Python Tutor
 visualization within your web page (as shown in the “Learn”
-box above).  The author of the HTML textbook for the introductory CS
-course at UC Berkeley (CS61A) has embedded
-dozens of such visualizations, as shown in this screenshot:
+box above). The screenshot below shows a few of these visualizations
+embedded within the HTML textbook for the introductory CS course at UC
+Berkeley (CS61A):
 
 
    
 

From 290c2b772d13f8378614d05ef04d6be8324bec43 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 14 Sep 2012 16:34:25 -0700
Subject: [PATCH 333/502] more tweaks

---
 v3/docs/embedding-HOWTO.txt  |  2 ++
 v3/docs/opt-trace-format.txt |  1 +
 v3/index.html                | 15 ++++++++-------
 3 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/v3/docs/embedding-HOWTO.txt b/v3/docs/embedding-HOWTO.txt
index de83d1b72..268b50dad 100644
--- a/v3/docs/embedding-HOWTO.txt
+++ b/v3/docs/embedding-HOWTO.txt
@@ -2,3 +2,5 @@ Instructions for embedding Online Python Tutor visualizations
 ------
 
 [Full documentation coming soon! For now, please email philip@pgbovine.net]
+
+[TODO: move to GitHub Markdown format]
diff --git a/v3/docs/opt-trace-format.txt b/v3/docs/opt-trace-format.txt
index c65b4098b..45d8617bf 100644
--- a/v3/docs/opt-trace-format.txt
+++ b/v3/docs/opt-trace-format.txt
@@ -3,3 +3,4 @@ Online Python Tutor execution trace format
 
 [TODO: write me!]
 
+[TODO: move to GitHub Markdown format]
diff --git a/v3/index.html b/v3/index.html
index 4f4bc59f7..e6d4093cb 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -76,9 +76,9 @@ 
    LEARN to program in Pyt
 
 
    
 
-
    Over 100,000 people have used Online Python Tutor to understand and
-debug their programs, often as a supplement to textbooks, lecture notes,
-and online programming tutorials.
    
+
    So far, over 100,000 people have used Online Python Tutor to
+understand and debug their programs, often as a supplement to reading
+textbooks, lecture notes, and online programming tutorials.
    
 
 
    In addition, instructors in over a dozen universities such as MIT, UC
 Berkeley, UC Davis, Sonoma State University, the University of
@@ -115,7 +115,7 @@ 
    EMBED visualizations in
 href="docs/embedding-HOWTO.txt">embed an Online Python Tutor
 visualization within your web page (as shown in the “Learn”
 box above). The screenshot below shows a few of these visualizations
-embedded within the HTML textbook for the introductory CS course at UC
+embedded within the online textbook for the introductory CS course at UC
 Berkeley (CS61A):
 
@@ -126,8 +126,8 @@ 
    EMBED visualizations in
 
 
    
 
-Similar visualizations have been embedded within two other web-based
-digital Python textbook projects: How
 to Think Like a Computer Scientist: Interactive Edition and Computer Science Circles.
@@ -146,7 +146,8 @@ 
    EMBED visualizations in
 
    SHARE visualizations online
    
 
 
    To share your current visualization, click the “Generate
-URL” button and paste that URL link in an email, social networking
+URL” button (at the bottom of this
+page) and paste that URL link in an email, social networking
 post, or forum question. When recipients click on that link, they will
 see your exact visualization. This feature is a more effective way for
 students to seek assistance than copying-and-pasting code snippets.
    

From 1967e68adf7228a7e749076608dbd8230d10e8b5 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 14 Sep 2012 16:46:06 -0700
Subject: [PATCH 334/502] minor

---
 v3/index.html | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/index.html b/v3/index.html
index e6d4093cb..7dc4c0246 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -153,7 +153,7 @@ 
    SHARE visualizations on
 students to seek assistance than copying-and-pasting code snippets.
    
 
 
     For example, clicking this
+href="visualize.html#code=%23+find+primes+using+a+for-else+construct%0Afor+n+in+range(2,+10)%3A%0A++++x_range+%3D+range(2,+n)%0A++++for+x+in+x_range%3A%0A++++++++if+n+%25+x+%3D%3D+0%3A%0A++++++++++++break%0A++++else%3A%0A++++++++%23+loop+fell+through+without+finding+a+factor%0A++++++++print(n)&mode=display&cumulative=false&py=2&curInstr=43">this
 link brings you directly to step 44 of 57 in a program that finds
 prime numbers using the Python for-else construct.
    
 

From 2c581abc70d6d7737ecd386a4b5498e93eba4c75 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 14 Sep 2012 18:18:05 -0700
Subject: [PATCH 335/502] more copyediting

---
 v3/index.html | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/v3/index.html b/v3/index.html
index 7dc4c0246..c0c8b511d 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -62,7 +62,7 @@
 
 
    
 
-
    LEARN to program in Python by writing code and visualizing execution
    
+
    LEARN programming by writing code and visualizing execution
    
 
 
    Online Python Tutor
 enables teachers and students to write LEARN to program in Pyt
 
    
 
 
    So far, over 100,000 people have used Online Python Tutor to
-understand and debug their programs, often as a supplement to reading
-textbooks, lecture notes, and online programming tutorials.
    
+understand and debug their programs, often as a supplement to learning
+from textbooks, lecture notes, and online programming tutorials.
    
 
 
    In addition, instructors in over a dozen universities such as MIT, UC
 Berkeley, UC Davis, Sonoma State University, the University of
 Washington, the University of Waterloo, Luther College, and Swarthmore
-College have adopted it for teaching introductory computer science
+College have used it for teaching introductory computer science
 courses.
    
 
 
    
-We are actively seeking partnerships with educators at all levels.
-Please email philip@pgbovine.net if you are interested.
+But this is just the beginning. We are seeking partnerships with
+educators at all levels to deploy and improve this tool.  Please email
+philip@pgbovine.net if you are interested in collaborating.
 
    
 
 
    

From e4841e331020dedc5b8f876bd488b6a150701c38 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 14 Sep 2012 18:28:35 -0700
Subject: [PATCH 336/502] more minor edits

---
 v3/index.html | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/v3/index.html b/v3/index.html
index c0c8b511d..ce1bb6649 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -72,7 +72,7 @@ 
    LEARN programming by wr
 
 
    For example, here is a recursive function that finds the sum of
 linked list elements. Click the “Forward” button to start
-stepping through execution.
    
+visualizing its execution one step at a time.
    
 
 
    
 
@@ -160,7 +160,7 @@ 
    SHARE visualizations on
 
 
    In the near future, we plan to add an online authoring environment so
 that you can save code examples and then create annotations, lessons,
-discussion threads, and interactive activities on top of your
+discussion threads, and interactive exercises on top of your
 visualizations.
    
 
 
    

From efccc69ff344e25937a96e6e0b4514755acb572c Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 14 Sep 2012 22:39:24 -0700
Subject: [PATCH 337/502] more tweaks but not completely happy yet

---
 v3/index.html | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/v3/index.html b/v3/index.html
index ce1bb6649..127b89020 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -31,7 +31,7 @@
 
 
 
-Online Python Tutor: Learn Python programming in your web browser
+Online Python Tutor - Learn programming by visualizing code execution
 
 
 
@@ -62,17 +62,28 @@
 
 
    
 
-
    LEARN programming by writing code and visualizing execution
    
+
    LEARN programming by visualizing code execution
    
 
+
+
+
+
    Online Python Tutor is a
+free educational tool that helps students overcome a central difficulty
+in learning programming: understanding how each line of a program's
+source code affects its execution. This tool allows a teacher or student
+to write a Python program directly
+in the web browser and then visualize what the computer is doing as the
+program executes.
    
 
-
    For example, here is a recursive function that finds the sum of
-linked list elements. Click the “Forward” button to start
-visualizing its execution one step at a time.
    
+
    For example, I wrote the following program to sum up the numbers in a
+linked list. Click the “Forward” button below to execute it
+one step at a time and visualize its run-time data.
    
 
 
    
 
@@ -83,8 +94,8 @@ 
    LEARN programming by wr
 
    In addition, instructors in over a dozen universities such as MIT, UC
 Berkeley, UC Davis, Sonoma State University, the University of
 Washington, the University of Waterloo, Luther College, and Swarthmore
-College have used it for teaching introductory computer science
-courses.
    
+College have used it for teaching introductory computer science and
+programming courses.
    
 
 
    
 But this is just the beginning. We are seeking partnerships with

From 35b17bafa16f0989f34eb65d60a7b620b2a8d887 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 14 Sep 2012 22:39:54 -0700
Subject: [PATCH 338/502] bah

---
 v3/visualize.html | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/visualize.html b/v3/visualize.html
index adf720106..230ccd1b1 100644
--- a/v3/visualize.html
+++ b/v3/visualize.html
@@ -30,7 +30,7 @@
  -->
 
 
-  Online Python Tutor (v3)
+  Online Python Tutor - Visualize program execution
 
 
 

From 137be43bdc9506b41e677bb5d72d81435685b83b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 14 Sep 2012 23:19:41 -0700
Subject: [PATCH 339/502] ugh still progressing ...

---
 v3/index.html | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/v3/index.html b/v3/index.html
index 127b89020..2a056bb54 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -74,16 +74,19 @@ 
    LEARN programming by vi
 
 
 
    Online Python Tutor is a
-free educational tool that helps students overcome a central difficulty
-in learning programming: understanding how each line of a program's
-source code affects its execution. This tool allows a teacher or student
-to write a Python program directly
-in the web browser and then visualize what the computer is doing as the
-program executes.
    
-
-
    For example, I wrote the following program to sum up the numbers in a
-linked list. Click the “Forward” button below to execute it
-one step at a time and visualize its run-time data.
    
+free educational tool that helps students overcome a fundamental
+difficulty of learning programming: understanding what happens as the
+computer executes each line of a program's source code.  Using this
+tool, a teacher or student can write a Python program directly in the web
+browser and visualize what the computer is doing step-by-step as it
+executes the program.
    
+
+
    For example, I wrote the following Python program to recursively
+find the sum of a linked list of numbers.  Click the
+“Forward” button to see what happens as the computer
+executes one line of code at a time.
    
 
 
    
 

From 4fe666089e17cec4aed0fadadb4702939ce61e8d Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 15 Sep 2012 08:29:41 -0700
Subject: [PATCH 340/502] minor

---
 v3/index.html | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/v3/index.html b/v3/index.html
index 2a056bb54..d8828c718 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -101,8 +101,8 @@ 
    LEARN programming by vi
 programming courses.
    
 
 
    
-But this is just the beginning. We are seeking partnerships with
-educators at all levels to deploy and improve this tool.  Please email
+But this is just the beginning. We are actively seeking partnerships with
+educators at all grade levels to deploy and improve this tool.  Email
 philip@pgbovine.net if you are interested in collaborating.
 
    
 
@@ -173,8 +173,8 @@ 
    SHARE visualizations on
 prime numbers using the Python for-else construct.
    
 
 
    In the near future, we plan to add an online authoring environment so
-that you can save code examples and then create annotations, lessons,
-discussion threads, and interactive exercises on top of your
+that you can save code examples and then create annotations,
+discussion threads, lessons, and interactive exercises on top of your
 visualizations.
    
 
 
    

From bd6c72ca73b70e358d91478e0ee5e9280f89a301 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 15 Sep 2012 09:02:44 -0700
Subject: [PATCH 341/502] privacy

---
 v3/index.html     | 5 +++--
 v3/visualize.html | 5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/v3/index.html b/v3/index.html
index d8828c718..f102ae43c 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -222,9 +222,10 @@ 
    SHARE visualizations on
 
 
    Join the pythontutor-users
-mailing list to participate in user discussions or pythontutor-announce
-to receive occasional announcements.
    
+to receive occasional announcements.
+(Your name and email address will be kept private; only the list owner can see them.)
    
 
 
    Copyright © 2010-2012 Philip Guo. All rights reserved.
    
 
diff --git a/v3/visualize.html b/v3/visualize.html
index 230ccd1b1..316033114 100644
--- a/v3/visualize.html
+++ b/v3/visualize.html
@@ -175,9 +175,10 @@
 
 
    Join the pythontutor-users
-mailing list to participate in user discussions or pythontutor-announce
-to receive occasional announcements.
    
+to receive occasional announcements.
+(Your name and email address will be kept private; only the list owner can see them.)
    
 
 
    
 

From f839a50155a3241964ce6e69dfb86618c650a761 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 15 Sep 2012 09:41:52 -0700
Subject: [PATCH 342/502] cleaned up more

---
 v3/js/opt-frontend.js | 78 ++++++++++++++++---------------------------
 1 file changed, 29 insertions(+), 49 deletions(-)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index fd60d06df..8ba908163 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -84,42 +84,7 @@ $(document).ready(function() {
   $(window).bind("hashchange", function(e) {
     appMode = $.bbq.getState('mode'); // assign this to the GLOBAL appMode
 
-    //console.log('hashchange:', appMode);
-
-    preseededCode = $.bbq.getState('code'); // yuck, global!
-    var preseededMode = $.bbq.getState('mode');
-
-
-    // ugh, ugly tristate due to the possibility of being undefined :)
-    var cumulativeState = $.bbq.getState('cumulative');
-    if (cumulativeState !== undefined) {
-      $('#cumulativeModeSelector').val(cumulativeState);
-    }
-
-    var pyState = $.bbq.getState('py');
-    if (pyState !== undefined) {
-      $('#pythonVersionSelector').val(pyState);
-    }
-
-
-    // only bother with curInstr when we're visualizing ...
-    if (!preseededCurInstr && preseededMode == 'display') { // TODO: kinda gross hack
-      preseededCurInstr = Number($.bbq.getState('curInstr'));
-    }
-
-    // default mode is 'edit'
-    if (appMode === undefined) {
-      appMode = 'edit';
-    }
-
-    // if there's no myVisualizer, then default to edit mode since there's
-    // nothing to visualize yet:
-    if (!myVisualizer) {
-      appMode = 'edit';
-    }
-
-
-    if (appMode == 'edit') {
+    if (appMode === undefined || appMode == 'edit') {
       $("#pyInputPane").show();
       $("#pyOutputPane").hide();
     }
@@ -139,7 +104,6 @@ $(document).ready(function() {
       $('#pyOutputPane #editBtn').click(function() {
         enterEditMode();
       });
-
     }
     else {
       assert(false);
@@ -148,12 +112,6 @@ $(document).ready(function() {
     $('#urlOutput').val(''); // clear to avoid stale values
   });
 
-  // From: http://benalman.com/projects/jquery-bbq-plugin/
-  //   Since the event is only triggered when the hash changes, we need
-  //   to trigger the event now, to handle the hash the page may have
-  //   loaded with.
-  $(window).trigger( "hashchange" );
-
 
   $("#executeBtn").attr('disabled', false);
   $("#executeBtn").click(function() {
@@ -477,19 +435,41 @@ $(document).ready(function() {
   });
 
 
-  if (preseededCode) {
-    setCodeMirrorVal(preseededCode);
+  // handle hash parameters passed in when loading the page
+  preseededCode = $.bbq.getState('code');
+  preseededCurInstr = Number($.bbq.getState('curInstr'));
 
-    if ($.bbq.getState('mode') == 'display') {
-      $("#executeBtn").trigger('click');
-    }
+  // ugh, ugly tristate due to the possibility of them being undefined
+  var cumulativeState = $.bbq.getState('cumulative');
+  if (cumulativeState !== undefined) {
+    $('#cumulativeModeSelector').val(cumulativeState);
+  }
+  var pyState = $.bbq.getState('py');
+  if (pyState !== undefined) {
+    $('#pythonVersionSelector').val(pyState);
+  }
+
+  appMode = $.bbq.getState('mode'); // assign this to the GLOBAL appMode
+  if ((appMode == "display") && preseededCode) {
+    setCodeMirrorVal(preseededCode);
+    $("#executeBtn").trigger('click');
   }
   else {
     // select a canned example on start-up:
     $("#aliasExampleLink").trigger('click');
-  }
 
+    if (appMode === undefined) {
+      // default mode is 'edit', don't trigger a "hashchange" event
+      appMode = 'edit';
+    }
+    else {
+      // fail-soft by killing all passed-in hashes and triggering a "hashchange"
+      // event, which will then go to 'edit' mode
+      $.bbq.removeState();
+    }
+  }
 
+  
   // log a generic AJAX error handler
   $(document).ajaxError(function() {
     alert("Server error (possibly due to memory/resource overload).");

From adbf947d68f0794af58c871a53ffe5c651b7272c Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 15 Sep 2012 09:51:24 -0700
Subject: [PATCH 343/502] subtle bugfix

---
 v3/js/opt-frontend.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 8ba908163..9e777da84 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -436,8 +436,11 @@ $(document).ready(function() {
 
 
   // handle hash parameters passed in when loading the page
-  preseededCode = $.bbq.getState('code');
   preseededCurInstr = Number($.bbq.getState('curInstr'));
+  preseededCode = $.bbq.getState('code');
+  if (preseededCode) {
+    setCodeMirrorVal(preseededCode);
+  }
 
   // ugh, ugly tristate due to the possibility of them being undefined
   var cumulativeState = $.bbq.getState('cumulative');
@@ -451,7 +454,6 @@ $(document).ready(function() {
 
   appMode = $.bbq.getState('mode'); // assign this to the GLOBAL appMode
   if ((appMode == "display") && preseededCode) {
-    setCodeMirrorVal(preseededCode);
     $("#executeBtn").trigger('click');
   }
   else {

From cf0bcbaa267b570d0d278799ab3b8267f9151aa6 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 15 Sep 2012 09:55:31 -0700
Subject: [PATCH 344/502] dum

---
 v3/js/opt-frontend.js | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 9e777da84..c4463515d 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -441,6 +441,10 @@ $(document).ready(function() {
   if (preseededCode) {
     setCodeMirrorVal(preseededCode);
   }
+  else {
+    // select a canned example on start-up:
+    $("#aliasExampleLink").trigger('click');
+  }
 
   // ugh, ugly tristate due to the possibility of them being undefined
   var cumulativeState = $.bbq.getState('cumulative');
@@ -453,13 +457,10 @@ $(document).ready(function() {
   }
 
   appMode = $.bbq.getState('mode'); // assign this to the GLOBAL appMode
-  if ((appMode == "display") && preseededCode) {
+  if ((appMode == "display") && preseededCode /* ONLY jump to display when there's pre-seeded code */) {
     $("#executeBtn").trigger('click');
   }
   else {
-    // select a canned example on start-up:
-    $("#aliasExampleLink").trigger('click');
-
     if (appMode === undefined) {
       // default mode is 'edit', don't trigger a "hashchange" event
       appMode = 'edit';

From af1dd7f57ad45d7556e86570e0c51cdb0cbad1fe Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 15 Sep 2012 10:04:27 -0700
Subject: [PATCH 345/502] teeny

---
 v3/index.html     | 2 +-
 v3/visualize.html | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/v3/index.html b/v3/index.html
index f102ae43c..cd521a69b 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -75,7 +75,7 @@ 
    LEARN programming by vi
 
 
    Online Python Tutor is a
 free educational tool that helps students overcome a fundamental
-difficulty of learning programming: understanding what happens as the
+barrier to learning programming: understanding what happens as the
 computer executes each line of a program's source code.  Using this
 tool, a teacher or student can write a Python program directly in the web
diff --git a/v3/visualize.html b/v3/visualize.html
index 316033114..dade7317c 100644
--- a/v3/visualize.html
+++ b/v3/visualize.html
@@ -182,7 +182,7 @@
 
 
    
 
-Online Python Tutor supports Online Python Tutor supports Python 2.7 and Python 3.2 with limited module
 imports and no file I/O. It is designed for teaching programming, not

From e18b909bc5429d42d29e3bc70bcffff68d564a8c Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 15 Sep 2012 11:28:40 -0700
Subject: [PATCH 346/502] subtle

---
 v3/js/opt-frontend.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index c4463515d..63ec82072 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -436,7 +436,6 @@ $(document).ready(function() {
 
 
   // handle hash parameters passed in when loading the page
-  preseededCurInstr = Number($.bbq.getState('curInstr'));
   preseededCode = $.bbq.getState('code');
   if (preseededCode) {
     setCodeMirrorVal(preseededCode);
@@ -457,7 +456,8 @@ $(document).ready(function() {
   }
 
   appMode = $.bbq.getState('mode'); // assign this to the GLOBAL appMode
-  if ((appMode == "display") && preseededCode /* ONLY jump to display when there's pre-seeded code */) {
+  if ((appMode == "display") && preseededCode /* jump to display only with pre-seeded code */) {
+    preseededCurInstr = Number($.bbq.getState('curInstr'));
     $("#executeBtn").trigger('click');
   }
   else {

From 6171383d139fc75291d1abc46eee6ebe9f009bc2 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 15 Sep 2012 12:44:10 -0700
Subject: [PATCH 347/502] thanks kevin!

---
 v3/css/index.css | 4 ++++
 v3/index.html    | 1 +
 2 files changed, 5 insertions(+)

diff --git a/v3/css/index.css b/v3/css/index.css
index ca3edf737..d2e7aa29f 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -7,7 +7,11 @@ body {
 
   font-size: 12pt;
 
+  /* use fixed width for simplicity */
   max-width: 900px;
+  min-width: 900px;
+  width: 900px;
+
   margin-left: auto;
   margin-right: auto;
 }
diff --git a/v3/index.html b/v3/index.html
index cd521a69b..2a1431b28 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -225,6 +225,7 @@ 
    SHARE visualizations on
 mailing list to participate in user discussions and pythontutor-announce
 to receive occasional announcements.
+
    
 (Your name and email address will be kept private; only the list owner can see them.)
    
 
 
    Copyright © 2010-2012 Philip Guo. All rights reserved.
    

From f147cd1c122c6d9bb744df7bdec479fb61680318 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 15 Sep 2012 13:06:32 -0700
Subject: [PATCH 348/502] added

---
 v3/docs/user-FAQ.md | 6 ++++++
 1 file changed, 6 insertions(+)
 create mode 100644 v3/docs/user-FAQ.md

diff --git a/v3/docs/user-FAQ.md b/v3/docs/user-FAQ.md
new file mode 100644
index 000000000..e955fd15a
--- /dev/null
+++ b/v3/docs/user-FAQ.md
@@ -0,0 +1,6 @@
+# Frequently Asked Questions
+## Online Python Tutor
+
+Email philip@pgbovine.net if you have a question that isn't addressed
+here.
+

From eb68d8d3c986b42287d3fc0105839ab882085da8 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 15 Sep 2012 13:14:38 -0700
Subject: [PATCH 349/502] Update v3/docs/user-FAQ.md

---
 v3/docs/user-FAQ.md | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/v3/docs/user-FAQ.md b/v3/docs/user-FAQ.md
index e955fd15a..f66802040 100644
--- a/v3/docs/user-FAQ.md
+++ b/v3/docs/user-FAQ.md
@@ -1,6 +1,15 @@
-# Frequently Asked Questions
-## Online Python Tutor
+# Frequently Asked Questions from users of Online Python Tutor
 
-Email philip@pgbovine.net if you have a question that isn't addressed
-here.
+Email philip@pgbovine.net if you have a question that isn't addressed here.
 
+#### I thought all objects in Python are on the heap; why does Online Python Tutor render primitive values (e.g., numbers, strings) inside of stack frames?
+
+This was a design decision made to keep the display less cluttered;
+if we were truly faithful to Python's semantics, that would result in far too many arrows (pointers) being drawn.
+However, note that since primitives are **immutable** and thus behave identically regardless of aliasing,
+it doesn't matter whether they're rendered in the stack or heap.
+
+
+#### Did you know that stepping through code with generators looks weird when "display frames of exited functions" is selected?
+
+Yes, this is a known bug, but the fix isn't straightforward at the moment.

From efe46519ebab99f32550b5d17d5443bac9fab737 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 15 Sep 2012 13:19:42 -0700
Subject: [PATCH 350/502] yeah faq

---
 v3/visualize.html | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/v3/visualize.html b/v3/visualize.html
index dade7317c..ee9201c6f 100644
--- a/v3/visualize.html
+++ b/v3/visualize.html
@@ -173,6 +173,12 @@
 philip@pgbovine.net
 
    
 
+
    Have a question? Maybe the FAQ
+or other documentation
+can help.
    
+
 
    Join the pythontutor-users
 mailing list to participate in user discussions and 
Date: Sat, 15 Sep 2012 14:38:07 -0700
Subject: [PATCH 351/502] set memory limits to protect against memory bombs

---
 v3/web_exec.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/v3/web_exec.py b/v3/web_exec.py
index 229cb841b..e6cc4d497 100644
--- a/v3/web_exec.py
+++ b/v3/web_exec.py
@@ -18,6 +18,14 @@
 import sys
 
 
+# set ~50MB limit on virtual memory to protect against memory bombs such as:
+#
+#   x = 2
+#   while True: x = x*x
+import resource
+resource.setrlimit(resource.RLIMIT_AS, (50000000,50000000)) 
+
+
 # set to true if you want to log queries in DB_FILE 
 LOG_QUERIES = False
 

From ec9cd33336f26a335b83e3007d42ffd4ff58e3a9 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 15 Sep 2012 14:54:05 -0700
Subject: [PATCH 352/502] better dos protection

---
 v3/web_exec.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/v3/web_exec.py b/v3/web_exec.py
index e6cc4d497..702c3e33a 100644
--- a/v3/web_exec.py
+++ b/v3/web_exec.py
@@ -18,12 +18,14 @@
 import sys
 
 
-# set ~50MB limit on virtual memory to protect against memory bombs such as:
+# set ~300MB limit on virtual memory AND a 10-second CPU time limit
+# to protect against memory bombs such as:
 #
 #   x = 2
 #   while True: x = x*x
 import resource
-resource.setrlimit(resource.RLIMIT_AS, (50000000,50000000)) 
+resource.setrlimit(resource.RLIMIT_AS, (300000000, 300000000))
+resource.setrlimit(resource.RLIMIT_CPU, (10, 10))
 
 
 # set to true if you want to log queries in DB_FILE 

From ebb3071f93d66cab9fcfc0a54f027bc37196f96a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 15 Sep 2012 15:00:22 -0700
Subject: [PATCH 353/502] more tuning

---
 v3/web_exec.py | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/v3/web_exec.py b/v3/web_exec.py
index 702c3e33a..2c7752f73 100644
--- a/v3/web_exec.py
+++ b/v3/web_exec.py
@@ -18,14 +18,14 @@
 import sys
 
 
-# set ~300MB limit on virtual memory AND a 10-second CPU time limit
-# to protect against memory bombs such as:
+# set ~200MB virtual memory limit AND a 5-second CPU time limit
+# (tuned for Webfaction shared hosting) to protect against memory bombs such as:
 #
 #   x = 2
 #   while True: x = x*x
 import resource
-resource.setrlimit(resource.RLIMIT_AS, (300000000, 300000000))
-resource.setrlimit(resource.RLIMIT_CPU, (10, 10))
+resource.setrlimit(resource.RLIMIT_AS, (200000000, 200000000))
+resource.setrlimit(resource.RLIMIT_CPU, (5, 5))
 
 
 # set to true if you want to log queries in DB_FILE 

From f2e17354a22f188da60ba97f730ed7602522aec8 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 15 Sep 2012 16:50:47 -0700
Subject: [PATCH 354/502] Update v3/docs/user-FAQ.md

---
 v3/docs/user-FAQ.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/docs/user-FAQ.md b/v3/docs/user-FAQ.md
index f66802040..986017904 100644
--- a/v3/docs/user-FAQ.md
+++ b/v3/docs/user-FAQ.md
@@ -2,7 +2,7 @@
 
 Email philip@pgbovine.net if you have a question that isn't addressed here.
 
-#### I thought all objects in Python are on the heap; why does Online Python Tutor render primitive values (e.g., numbers, strings) inside of stack frames?
+#### I thought all objects in Python are (conceptually) on the heap; why does Online Python Tutor render primitive values (e.g., numbers, strings) inside of stack frames?
 
 This was a design decision made to keep the display less cluttered;
 if we were truly faithful to Python's semantics, that would result in far too many arrows (pointers) being drawn.

From 5e255e58fbfa85f55d3c8fa70e4541adbf9be7ee Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 15 Sep 2012 16:58:03 -0700
Subject: [PATCH 355/502] Update v3/docs/user-FAQ.md

---
 v3/docs/user-FAQ.md | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/v3/docs/user-FAQ.md b/v3/docs/user-FAQ.md
index 986017904..4e65eef8a 100644
--- a/v3/docs/user-FAQ.md
+++ b/v3/docs/user-FAQ.md
@@ -10,6 +10,13 @@ However, note that since primitives are **immutable** and thus behave identicall
 it doesn't matter whether they're rendered in the stack or heap.
 
 
+#### Visualizations of object-oriented programs are confusing; why are there grayed-out frames everywhere?
+
+We haven't "cleaned-up" the visualizations to look better for OOP code examples;
+they are simply displaying what Python is doing step-by-step as those programs execute.
+Please email if you have suggestions for more aesthetically-pleasing yet accurate visualizations.
+
+
 #### Did you know that stepping through code with generators looks weird when "display frames of exited functions" is selected?
 
-Yes, this is a known bug, but the fix isn't straightforward at the moment.
+Yes, this is a known bug, but sadly the fix isn't straightforward at the moment.

From b732885ffa71a056ccbad47e2d233c01314f8521 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 15:29:06 -0700
Subject: [PATCH 356/502] added

---
 v3/docs/developer-overview.md | 4 ++++
 1 file changed, 4 insertions(+)
 create mode 100644 v3/docs/developer-overview.md

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
new file mode 100644
index 000000000..251174f7d
--- /dev/null
+++ b/v3/docs/developer-overview.md
@@ -0,0 +1,4 @@
+# Overview for Developers of Online Python Tutor
+
+This document is a starting point for someone who wants to hack on
+Online Python Tutor (thereafter abbreviated as OPT).

From 736e3984fbc913719248a03783eb5f374a9e2b6a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 15:37:25 -0700
Subject: [PATCH 357/502] Update v3/docs/developer-overview.md

asdf
---
 v3/docs/developer-overview.md | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index 251174f7d..984845578 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -1,4 +1,29 @@
 # Overview for Developers of Online Python Tutor
 
-This document is a starting point for someone who wants to hack on
+This document is a starting point for anyone who wants to hack on
 Online Python Tutor (thereafter abbreviated as OPT).
+
+Look at the Git history to see when this document was last updated; the more time
+elapsed since that date, the more likely things are out-of-date. Please email
+philip@pgbovine.net if you have questions.
+
+
+## Running OPT locally on your machine
+
+When you check out OPT from GitHub, it's configured by default to run on
+Google App Engine. So download the Google App Engine [Python SDK](https://developers.google.com/appengine/downloads)
+for your OS and then run:
+
+    cd OnlinePythonTutor/
+    dev_appserver.py v3/
+
+Now if you visit http://localhost:8080/ on your browser, you should see the main OPT editor screen.
+
+Congrats! Now you can edit your code and reload the page to test your changes. You don't need to shut down and restart
+the local webserver after every edit.
+
+The main caveat here is that Google App Engine runs Python 2.7, so you won't be able to test Python 3 locally this way.
+
+
+## Overall system architecture
+

From fa41f9431102d27d94e585a80d8de989e8680137 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 15:44:59 -0700
Subject: [PATCH 358/502] Update v3/docs/developer-overview.md

---
 v3/docs/developer-overview.md | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index 984845578..b34474a1c 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -7,6 +7,8 @@ Look at the Git history to see when this document was last updated; the more tim
 elapsed since that date, the more likely things are out-of-date. Please email
 philip@pgbovine.net if you have questions.
 
+And please excuse the sloppy writing; I'm not trying to win any style awards here :)
+
 
 ## Running OPT locally on your machine
 
@@ -19,11 +21,22 @@ for your OS and then run:
 
 Now if you visit http://localhost:8080/ on your browser, you should see the main OPT editor screen.
 
-Congrats! Now you can edit your code and reload the page to test your changes. You don't need to shut down and restart
-the local webserver after every edit.
+Congrats! Now you can edit any code in `OnlinePythonTutor/v3/` and reload the page to test your changes.
+You don't need to shut down and restart the local webserver after every edit.
 
 The main caveat here is that Google App Engine runs Python 2.7, so you won't be able to test Python 3 locally this way.
 
 
 ## Overall system architecture
 
+OPT consists of a pure-Python backend and an HTML/CSS/JavaScript frontend. All of the relevant files are located in `OnlinePythonTutor/v3/`, since v3 is the currently active version.
+
+Here is a typical user interaction sequence:
+
+1. The user types in Python code in the editor (powered by [CodeMirror](http://www.codemirror.net/)).
+2. The user hits the "Visualize execution" button.
+3. The OPT frontend sends the user's Python code as a string to the backend by making an AJAX GET request.
+4. The backend executes the Python code under the supervision of the Python [bdb](http://docs.python.org/library/bdb.html) debugger module, produces an execution trace, and send that trace back to the frontend.
+5. The frontend switches to a visualization pane, parses the execution trace, and renders the appropriate stack frames and heap objects.
+6. When the user interacts with the frontend by stepping through execution points (forwards and backwards), the frontend renders the proper data structures WITHOUT making another call to the backend.
+

From 6aa3d705e3b621353d3f8c92debf05e48cf99f49 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 15:53:20 -0700
Subject: [PATCH 359/502] Update v3/docs/developer-overview.md

---
 v3/docs/developer-overview.md | 30 ++++++++++++++++++++++++++----
 1 file changed, 26 insertions(+), 4 deletions(-)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index b34474a1c..b2cfad127 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -29,14 +29,36 @@ The main caveat here is that Google App Engine runs Python 2.7, so you won't be
 
 ## Overall system architecture
 
-OPT consists of a pure-Python backend and an HTML/CSS/JavaScript frontend. All of the relevant files are located in `OnlinePythonTutor/v3/`, since v3 is the currently active version.
-
+OPT consists of a pure-Python backend and an HTML/CSS/JavaScript frontend.
 Here is a typical user interaction sequence:
 
-1. The user types in Python code in the editor (powered by [CodeMirror](http://www.codemirror.net/)).
+1. The user types in Python code in the web-based text editor (powered by [CodeMirror](http://www.codemirror.net/)).
 2. The user hits the "Visualize execution" button.
 3. The OPT frontend sends the user's Python code as a string to the backend by making an AJAX GET request.
-4. The backend executes the Python code under the supervision of the Python [bdb](http://docs.python.org/library/bdb.html) debugger module, produces an execution trace, and send that trace back to the frontend.
+4. The backend executes the Python code under the supervision of the Python [bdb](http://docs.python.org/library/bdb.html) debugger module, produces an execution trace, and send that trace back to the frontend in JSON format.
 5. The frontend switches to a visualization pane, parses the execution trace, and renders the appropriate stack frames and heap objects.
 6. When the user interacts with the frontend by stepping through execution points (forwards and backwards), the frontend renders the proper data structures WITHOUT making another call to the backend.
 
+All relevant files are located in `OnlinePythonTutor/v3/`, since v3 is the currently-active version.
+
+The frontend consists of:
+        visualize.html
+        css/opt-frontend.css
+        js/opt-frontend.js
+        css/pytutor.css
+        js/pytutor.js
+        
+
+`pytutor.[js|css]` contains the bulk of the OPT frontend code.
+`opt-frontend.[js|css]` contains code that is specific to `visualize.html` and doesn't make sense for, say,
+embedding OPT visualizations into other types of webpages.
+
+The backend consists of:
+
+        pg_logger.py  : the main entry point for the OPT backend
+        pg_encoder.py : encodes the trace format into JSON to send to frontend
+        generate_json_trace.py : script to test the backend independent of the frontend
+        app.yaml and pythontutor.py : config files for Google App Engine
+        web_exec.py : example CGI script for deploying on CGI-enabled webservers
+        
+bah
\ No newline at end of file

From 635498e8b217cc63cfc8b3a2da7c45a18fd2af2a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 16:02:08 -0700
Subject: [PATCH 360/502] Update v3/docs/developer-overview.md

---
 v3/docs/developer-overview.md | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index b2cfad127..c0df5610e 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -24,7 +24,13 @@ Now if you visit http://localhost:8080/ on your browser, you should see the main
 Congrats! Now you can edit any code in `OnlinePythonTutor/v3/` and reload the page to test your changes.
 You don't need to shut down and restart the local webserver after every edit.
 
-The main caveat here is that Google App Engine runs Python 2.7, so you won't be able to test Python 3 locally this way.
+btw, using the default configuration, http://localhost:8080/ is actually loading the `v3/visualize.html` HTML file.
+(See `v3/pythontutor.py` for details.)
+
+The benefit of running OPT locally is that you can test all changes without going online. So even
+if you're eventually going to deploy NOT on Google App Engine, it makes good sense to install locally
+for development and testing. The main caveat here is that Google App Engine currently runs Python 2.7,
+so you won't be able to test Python 3 locally this way.
 
 
 ## Overall system architecture
@@ -47,10 +53,18 @@ The frontend consists of:
         js/opt-frontend.js
         css/pytutor.css
         js/pytutor.js
-        
+        
+
+`pytutor.[js|css]` contain the bulk of the OPT frontend code. In theory, if you set things up correctly,
+you should be able to **embed** an OPT visualization into any webpage with one line of JavaScript that looks like:
+
+        var v = new ExecutionVisualizer(domRoot, traceFromBackend, optionalParams);
+
+Thus, the design of `pytutor.[js|css]` is meant to be as modular as possible, which means abstracting
+everything in an `ExecutionVisualizer` object. This way, you can create multiple visualizer objects
+to embed on the same webpage and not have them interfere with one another.
 
-`pytutor.[js|css]` contains the bulk of the OPT frontend code.
-`opt-frontend.[js|css]` contains code that is specific to `visualize.html` and doesn't make sense for, say,
+`opt-frontend.[js|css]` contain code that is specific to the `visualize.html` page and doesn't make sense for, say,
 embedding OPT visualizations into other types of webpages.
 
 The backend consists of:
@@ -61,4 +75,3 @@ The backend consists of:
         app.yaml and pythontutor.py : config files for Google App Engine
         web_exec.py : example CGI script for deploying on CGI-enabled webservers
         
-bah
\ No newline at end of file

From eda1672968e046da35a447dddefeac029e13a87e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 16:17:33 -0700
Subject: [PATCH 361/502] Update v3/docs/developer-overview.md

---
 v3/docs/developer-overview.md | 36 ++++++++++++++++++++++++++++++++---
 1 file changed, 33 insertions(+), 3 deletions(-)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index c0df5610e..72db66d1b 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -1,7 +1,9 @@
-# Overview for Developers of Online Python Tutor
+# Developer's Guide Overview
 
 This document is a starting point for anyone who wants to hack on
-Online Python Tutor (thereafter abbreviated as OPT).
+Online Python Tutor (thereafter abbreviated as OPT). View it online at:
+
+https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/developer-overview.md
 
 Look at the Git history to see when this document was last updated; the more time
 elapsed since that date, the more likely things are out-of-date. Please email
@@ -73,5 +75,33 @@ The backend consists of:
         pg_encoder.py : encodes the trace format into JSON to send to frontend
         generate_json_trace.py : script to test the backend independent of the frontend
         app.yaml and pythontutor.py : config files for Google App Engine
-        web_exec.py : example CGI script for deploying on CGI-enabled webservers
+        web_exec.py : example CGI script for deploying backend on CGI-enabled webservers
+        
+
+## Hacking on the backend
+
+To modify the backend, you will mainly need to understand `pg_logger.py` and `pg_encoder.py`.
+
+### Two quick tips for starters
+
+First, run `generate_json_trace.py` to see the trace that the backend generates for a given input Python program.
+This is the main way to do an "end-to-end" test on your backend modifications. For example, if you wrote a Python
+program stored in `example.py`, then running:
+
+        python generate_json_trace.py example.py
+        
+will print a JSON-formatted execution trace to stdout. This is exactly what the backend sends to the frontend.
+(Actually not quite: the sent trace is actually compressed to eliminate all extraneous spaces and newlines.
+But for testing, I've made the trace more human-readable.)
+
+Second, when you're "print debugging" in the backend, you can't simply print to stdout, since `pg_logger.py`
+*redirects* stdout to a buffer. Instead, you need to write all of your print statements as:
+
+        print >> sys.stderr, 
         
+so that the output goes to stderr.
+
+The easiest way to debug is to insert in print statements (to stderr) and then run `generate_json_trace.py` on
+small code examples.
+
+### 
\ No newline at end of file

From df0eb7ef89dd88c4f91a04c581d46bd8c23a63e8 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 16:38:19 -0700
Subject: [PATCH 362/502] Update v3/docs/developer-overview.md

---
 v3/docs/developer-overview.md | 81 +++++++++++++++++++++++++++++++----
 1 file changed, 73 insertions(+), 8 deletions(-)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index 72db66d1b..daad58ac7 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -6,16 +6,22 @@ Online Python Tutor (thereafter abbreviated as OPT). View it online at:
 https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/developer-overview.md
 
 Look at the Git history to see when this document was last updated; the more time
-elapsed since that date, the more likely things are out-of-date. Please email
-philip@pgbovine.net if you have questions.
+elapsed since that date, the more likely things are out-of-date.
+
+I'm assuming that you're competent in Python, JavaScript, command-line-fu, and Google-fu,
+so I won't do much hand-holding in these directions.
+But feel free to email philip@pgbovine.net if you have questions.
 
 And please excuse the sloppy writing; I'm not trying to win any style awards here :)
 
 
-## Running OPT locally on your machine
+## Getting Started: Running OPT locally on your machine
+
+When you check out OPT from GitHub, it's configured by default to run on Google App Engine
+(but it can also run fine on a CGI-enabled webserver such as Apache).
 
-When you check out OPT from GitHub, it's configured by default to run on
-Google App Engine. So download the Google App Engine [Python SDK](https://developers.google.com/appengine/downloads)
+To run a local instance, download/install
+the Google App Engine [Python SDK](https://developers.google.com/appengine/downloads)
 for your OS and then run:
 
     cd OnlinePythonTutor/
@@ -60,7 +66,9 @@ The frontend consists of:
 `pytutor.[js|css]` contain the bulk of the OPT frontend code. In theory, if you set things up correctly,
 you should be able to **embed** an OPT visualization into any webpage with one line of JavaScript that looks like:
 
-        var v = new ExecutionVisualizer(domRoot, traceFromBackend, optionalParams);
+```javascript
+var v = new ExecutionVisualizer(domRoot, traceFromBackend, optionalParams);
+```
 
 Thus, the design of `pytutor.[js|css]` is meant to be as modular as possible, which means abstracting
 everything in an `ExecutionVisualizer` object. This way, you can create multiple visualizer objects
@@ -82,6 +90,7 @@ The backend consists of:
 
 To modify the backend, you will mainly need to understand `pg_logger.py` and `pg_encoder.py`.
 
+
 ### Two quick tips for starters
 
 First, run `generate_json_trace.py` to see the trace that the backend generates for a given input Python program.
@@ -97,11 +106,67 @@ But for testing, I've made the trace more human-readable.)
 Second, when you're "print debugging" in the backend, you can't simply print to stdout, since `pg_logger.py`
 *redirects* stdout to a buffer. Instead, you need to write all of your print statements as:
 
-        print >> sys.stderr, 
+```python
+print >> sys.stderr, 
+```
         
 so that the output goes to stderr.
 
 The easiest way to debug is to insert in print statements (to stderr) and then run `generate_json_trace.py` on
 small code examples.
 
-### 
\ No newline at end of file
+
+### Backend control flow
+
+Let's trace through a typical backend run to get a sense of how it works:
+
+The main entry point is this function in `pg_logger.py`:
+
+```python
+def exec_script_str(script_str, cumulative_mode, finalizer_func):
+```
+
+`script_str` is the entire string contents of the Python program for the backend to execute.
+Ignore `cumulative_mode` for now (just set it to `False`). `finalizer_func` is the function to call
+after the backend is done generating a trace.
+
+Let's look at how `generate_json_trace.py` calls `exec_script_str` (using a simplified version of the code):
+
+```python
+import pg_logger, json
+
+def json_finalizer(input_code, output_trace):
+  ret = dict(code=input_code, trace=output_trace)
+  json_output = json.dumps(ret, indent=2)
+  print(json_output)
+
+pg_logger.exec_script_str(open("example.py").read(), False, json_finalizer)
+```
+
+In this simplified example, the script opens `example.py`, reads its contents into a string, and passes it
+into `exec_script_str`. The finalizer function is `json_finalizer`, which takes two parameters --
+the original code from `example.py` (`input_code`) and the execution trace that it produced (`output_trace`) --
+inserts both into a dict, encodes that dict as a JSON object, and then prints that JSON object to stdout.
+That's why when you run `generate_json_trace.py`, its output is a JSON object printed to stdout.
+
+Note that if you pass in another finalizer function, then you can do other actions like postprocessing
+the output trace or saving it to a file rather than printing to stdout.
+
+Now that you know what you pass into `exec_script_str` and what comes out of it, let's dive into its guts
+to see how that execution trace (`output_trace`) is produced. Here is the code for `exec_script_str` in `pg_logger.py`:
+
+```python
+def exec_script_str(script_str, cumulative_mode, finalizer_func):
+  logger = PGLogger(cumulative_mode, finalizer_func)
+
+  try:
+    logger._runscript(script_str)
+  except bdb.BdbQuit:
+    pass
+  finally:
+    logger.finalize()
+```
+
+This code creates a `PGLogger` object then calls its `_runscript` method to run the script passed in as `script_str`.
+After execution finishes (possibly due to a bdb-related exception), the `finalize` method is run. This method
+does some postprocessing of the trace (`self.trace`) and then calls the user-supplied `finalizer_func`.

From e6541327d51e70e8a48ec86e7b0ae6422345da1e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 16:46:05 -0700
Subject: [PATCH 363/502] Update v3/docs/developer-overview.md

---
 v3/docs/developer-overview.md | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index daad58ac7..4ada5b1ab 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -170,3 +170,23 @@ def exec_script_str(script_str, cumulative_mode, finalizer_func):
 This code creates a `PGLogger` object then calls its `_runscript` method to run the script passed in as `script_str`.
 After execution finishes (possibly due to a bdb-related exception), the `finalize` method is run. This method
 does some postprocessing of the trace (`self.trace`) and then calls the user-supplied `finalizer_func`.
+
+`PGLogger` is a subclass of [bdb.Bdb](http://docs.python.org/library/bdb.html#bdb.Bdb),
+which is the Python standard debugger module. It stores a ton of fields to record what
+is going on as the target program (that the user passed in) executes. Its `_runscript` method
+is where the action starts. This method first sets up a sandboxed environment containing a restricted
+set of builtins (`user_builtins`) and redirection for stdout (`user_stdout`), and then executes:
+
+```python
+        try:
+          self.run(script_str, user_globals, user_globals)
+        except SystemExit:
+          raise bdb.BdbQuit
+```
+
+The `run` method is actually [inherited from bdb.Bdb](http://docs.python.org/library/bdb.html#bdb.Bdb.run).
+It executes the script in a modified global environment (`user_globals`).
+
+Ok, the debugger has just started executing the script that the user has passed in (from `example.py` in our example).
+What happens now?
+

From 93bbe9c9b0cae47c3ace683a1f9f7cd2388487b6 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 18:17:23 -0700
Subject: [PATCH 364/502] bam

---
 v3/README | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/v3/README b/v3/README
index b63b1d1fc..1fd36b8f4 100644
--- a/v3/README
+++ b/v3/README
@@ -1,4 +1,7 @@
-Thanks to John DeNero, this version of Online Python Tutor (v3) should work on both Python 2 and 3.
+This is the latest version of Online Python Tutor
 
-TODO: write more detailed instructions for running on Google App Engine (Python 2.7) and CGI (Python 2.X or 3.X)
+Thanks to John DeNero, this version works on both Python 2 and 3.
+
+All documentation is viewable online at:
+  https://github.com/pgbovine/OnlinePythonTutor/tree/master/v3/docs
 

From 8d4cb581cf122dd5e37ef72ae39bb32cda32c9f2 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 18:34:08 -0700
Subject: [PATCH 365/502] Update v3/docs/developer-overview.md

---
 v3/docs/developer-overview.md | 113 +++++++++++++++++++---------------
 1 file changed, 64 insertions(+), 49 deletions(-)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index 4ada5b1ab..00fd98a21 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -10,7 +10,10 @@ elapsed since that date, the more likely things are out-of-date.
 
 I'm assuming that you're competent in Python, JavaScript, command-line-fu, and Google-fu,
 so I won't do much hand-holding in these directions.
-But feel free to email philip@pgbovine.net if you have questions.
+
+This guy isn't meant to be comprehensive; rather, it's just a starting point for learning about the code
+and development workflow. You will undoubtedly still be confused about details after reading it, so
+feel free to email philip@pgbovine.net if you have questions.
 
 And please excuse the sloppy writing; I'm not trying to win any style awards here :)
 
@@ -36,7 +39,7 @@ btw, using the default configuration, http://localhost:8080/ is actually loading
 (See `v3/pythontutor.py` for details.)
 
 The benefit of running OPT locally is that you can test all changes without going online. So even
-if you're eventually going to deploy NOT on Google App Engine, it makes good sense to install locally
+if you're eventually going to deploy on something other than Google App Engine, it still makes sense to install locally
 for development and testing. The main caveat here is that Google App Engine currently runs Python 2.7,
 so you won't be able to test Python 3 locally this way.
 
@@ -46,45 +49,49 @@ so you won't be able to test Python 3 locally this way.
 OPT consists of a pure-Python backend and an HTML/CSS/JavaScript frontend.
 Here is a typical user interaction sequence:
 
-1. The user types in Python code in the web-based text editor (powered by [CodeMirror](http://www.codemirror.net/)).
+1. The user visits [visualize.html](http://pythontutor.com/visualize.html) and types in Python code in the web-based text editor.
 2. The user hits the "Visualize execution" button.
 3. The OPT frontend sends the user's Python code as a string to the backend by making an AJAX GET request.
-4. The backend executes the Python code under the supervision of the Python [bdb](http://docs.python.org/library/bdb.html) debugger module, produces an execution trace, and send that trace back to the frontend in JSON format.
-5. The frontend switches to a visualization pane, parses the execution trace, and renders the appropriate stack frames and heap objects.
-6. When the user interacts with the frontend by stepping through execution points (forwards and backwards), the frontend renders the proper data structures WITHOUT making another call to the backend.
+4. The backend executes the Python code under the supervision of the Python [bdb](http://docs.python.org/library/bdb.html) debugger, produces an execution trace, and send that trace back to the frontend in JSON format.
+5. The frontend switches to a visualization display, parses the execution trace, and renders the appropriate stack frames, heap objects, and pointers.
+6. When the user interacts with the frontend by stepping through execution points (forwards and backwards), the frontend renders the proper data structures **without** making another subsequent call to the backend.
 
 All relevant files are located in `OnlinePythonTutor/v3/`, since v3 is the currently-active version.
 
 The frontend consists of:
-        visualize.html
-        css/opt-frontend.css
-        js/opt-frontend.js
-        css/pytutor.css
-        js/pytutor.js
-        
+```
+visualize.html
+css/opt-frontend.css
+js/opt-frontend.js
+css/pytutor.css
+js/pytutor.js
+
+```
 
-`pytutor.[js|css]` contain the bulk of the OPT frontend code. In theory, if you set things up correctly,
-you should be able to **embed** an OPT visualization into any webpage with one line of JavaScript that looks like:
+`pytutor.[js|css]` contain the bulk of the OPT frontend code. In theory, you should be able to **embed** an
+OPT visualization into any webpage with one line of JavaScript that looks like:
 
 ```javascript
 var v = new ExecutionVisualizer(domRoot, traceFromBackend, optionalParams);
 ```
 
 Thus, the design of `pytutor.[js|css]` is meant to be as modular as possible, which means abstracting
-everything in an `ExecutionVisualizer` object. This way, you can create multiple visualizer objects
-to embed on the same webpage and not have them interfere with one another.
+everything in an `ExecutionVisualizer` class. This way, you can create multiple visualizer objects
+to embed on the same webpage without them interfering with one another.
 
 `opt-frontend.[js|css]` contain code that is specific to the `visualize.html` page and doesn't make sense for, say,
-embedding OPT visualizations into other types of webpages.
+embedding OPT visualizations into other webpages.
 
 The backend consists of:
+```
+pg_logger.py  - the main entry point to the OPT backend
+pg_encoder.py - encodes the trace format into JSON to send to frontend
+generate_json_trace.py - script to test the backend independent of the frontend
+app.yaml, pythontutor.py - files for deploying on Google App Engine
+web_exec.py - example CGI script for deploying backend on CGI-enabled webservers
+```        
 
-        pg_logger.py  : the main entry point for the OPT backend
-        pg_encoder.py : encodes the trace format into JSON to send to frontend
-        generate_json_trace.py : script to test the backend independent of the frontend
-        app.yaml and pythontutor.py : config files for Google App Engine
-        web_exec.py : example CGI script for deploying backend on CGI-enabled webservers
-        
+The backend works with both Python 2 and 3.
 
 ## Hacking on the backend
 
@@ -93,15 +100,21 @@ To modify the backend, you will mainly need to understand `pg_logger.py` and `pg
 
 ### Two quick tips for starters
 
+Since the backend's details might change, rather than documenting every last detail, I'd rather equip you with
+the knowledge needed to experiment with the code yourself, since that knowledge is less likely to get outdated.
+
 First, run `generate_json_trace.py` to see the trace that the backend generates for a given input Python program.
-This is the main way to do an "end-to-end" test on your backend modifications. For example, if you wrote a Python
-program stored in `example.py`, then running:
+This is the main way to do an "end-to-end" test on your backend modifications. For example, if you want the backend
+to process a Python program stored in `example.py`, then run:
 
-        python generate_json_trace.py example.py
-        
-will print a JSON-formatted execution trace to stdout. This is exactly what the backend sends to the frontend.
+```
+python generate_json_trace.py example.py
+```
+
+Doing so will print a JSON-formatted execution trace to stdout.
+This data is exactly what the backend sends to the frontend.
 (Actually not quite: the sent trace is actually compressed to eliminate all extraneous spaces and newlines.
-But for testing, I've made the trace more human-readable.)
+But for testing purposes, I've made the trace more human-readable.)
 
 Second, when you're "print debugging" in the backend, you can't simply print to stdout, since `pg_logger.py`
 *redirects* stdout to a buffer. Instead, you need to write all of your print statements as:
@@ -112,13 +125,14 @@ print >> sys.stderr, 
         
 so that the output goes to stderr.
 
-The easiest way to debug is to insert in print statements (to stderr) and then run `generate_json_trace.py` on
-small code examples.
+The easiest way to debug or investigate how some part of the code works is to **insert in print statements (to stderr)
+and then run `generate_json_trace.py` on small code examples**. Trust me -- being able to do this is way more
+effective than memorizing detailed documentation (which could be outdated by the time you read it!)
 
 
 ### Backend control flow
 
-Let's trace through a typical backend run to get a sense of how it works:
+Let's now trace through a typical backend run to get a sense of how it works.
 
 The main entry point is this function in `pg_logger.py`:
 
@@ -126,11 +140,11 @@ The main entry point is this function in `pg_logger.py`:
 def exec_script_str(script_str, cumulative_mode, finalizer_func):
 ```
 
-`script_str` is the entire string contents of the Python program for the backend to execute.
+`script_str` contains the entire string contents of the Python program for the backend to execute.
 Ignore `cumulative_mode` for now (just set it to `False`). `finalizer_func` is the function to call
 after the backend is done generating a trace.
 
-Let's look at how `generate_json_trace.py` calls `exec_script_str` (using a simplified version of the code):
+Let's look at how `generate_json_trace.py` calls `exec_script_str` (using a simplified version of its code):
 
 ```python
 import pg_logger, json
@@ -143,7 +157,7 @@ def json_finalizer(input_code, output_trace):
 pg_logger.exec_script_str(open("example.py").read(), False, json_finalizer)
 ```
 
-In this simplified example, the script opens `example.py`, reads its contents into a string, and passes it
+In this simplified example, the script opens `example.py`, reads its contents into a string, and passes that string
 into `exec_script_str`. The finalizer function is `json_finalizer`, which takes two parameters --
 the original code from `example.py` (`input_code`) and the execution trace that it produced (`output_trace`) --
 inserts both into a dict, encodes that dict as a JSON object, and then prints that JSON object to stdout.
@@ -152,13 +166,13 @@ That's why when you run `generate_json_trace.py`, its output is a JSON object pr
 Note that if you pass in another finalizer function, then you can do other actions like postprocessing
 the output trace or saving it to a file rather than printing to stdout.
 
-Now that you know what you pass into `exec_script_str` and what comes out of it, let's dive into its guts
-to see how that execution trace (`output_trace`) is produced. Here is the code for `exec_script_str` in `pg_logger.py`:
+Now that you know what's passed into `exec_script_str` and what comes out of it, let's dive into its guts
+to see how that all-important execution trace (`output_trace`) is produced.
+Here is the code for `exec_script_str` in `pg_logger.py`:
 
 ```python
 def exec_script_str(script_str, cumulative_mode, finalizer_func):
   logger = PGLogger(cumulative_mode, finalizer_func)
-
   try:
     logger._runscript(script_str)
   except bdb.BdbQuit:
@@ -167,26 +181,27 @@ def exec_script_str(script_str, cumulative_mode, finalizer_func):
     logger.finalize()
 ```
 
-This code creates a `PGLogger` object then calls its `_runscript` method to run the script passed in as `script_str`.
+This code creates a `PGLogger` object then calls its `_runscript` method to run the user's program (from `example.py`),
+which is passed in as `script_str`.
 After execution finishes (possibly due to a bdb-related exception), the `finalize` method is run. This method
-does some postprocessing of the trace (`self.trace`) and then calls the user-supplied `finalizer_func`.
+does some postprocessing of the trace (`self.trace`) and then finally calls the user-supplied `finalizer_func`.
 
 `PGLogger` is a subclass of [bdb.Bdb](http://docs.python.org/library/bdb.html#bdb.Bdb),
-which is the Python standard debugger module. It stores a ton of fields to record what
-is going on as the target program (that the user passed in) executes. Its `_runscript` method
+which is the Python standard debugger module. It stores lots of fields to record what
+is going on as it executes the program that the user passed in as `script_str`. Its `_runscript` method
 is where the action starts. This method first sets up a sandboxed environment containing a restricted
-set of builtins (`user_builtins`) and redirection for stdout (`user_stdout`), and then executes:
+set of builtins (`user_builtins`) and redirection for stdout (`user_stdout`), and then executes this code:
 
 ```python
-        try:
-          self.run(script_str, user_globals, user_globals)
-        except SystemExit:
-          raise bdb.BdbQuit
+try:
+  self.run(script_str, user_globals, user_globals)
+except SystemExit:
+  raise bdb.BdbQuit
 ```
 
 The `run` method is actually [inherited from bdb.Bdb](http://docs.python.org/library/bdb.html#bdb.Bdb.run).
-It executes the script in a modified global environment (`user_globals`).
+It executes the contents of `script_str` in a modified global environment (`user_globals`).
 
-Ok, the debugger has just started executing the script that the user has passed in (from `example.py` in our example).
+Ok, the debugger has just started executing the script that the user passed in (from `example.py` in our example).
 What happens now?
 

From 7ddb75ffd0ffd91c2b183962c561bac8f0c8a35f Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 19:11:57 -0700
Subject: [PATCH 366/502] Update v3/docs/developer-overview.md

---
 v3/docs/developer-overview.md | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index 00fd98a21..b278de022 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -202,6 +202,26 @@ except SystemExit:
 The `run` method is actually [inherited from bdb.Bdb](http://docs.python.org/library/bdb.html#bdb.Bdb.run).
 It executes the contents of `script_str` in a modified global environment (`user_globals`).
 
-Ok, the debugger has just started executing the script that the user passed in (from `example.py` in our example).
-What happens now?
+Ok, the debugger has just started executing the program that the user passed in (from `example.py` in our example).
+What happens now? Here's where the magic happens. Look at the methods called
+`user_call`, `user_return`, `user_exception`, and `user_line`. Again, those are all
+[inherited from bdb.Bdb](http://docs.python.org/library/bdb.html#bdb). As the user's program is running, bdb
+will pause execution at every function call, return, exception, and single-step and transfer control
+over to the respective handler methods. Since `PGLogger` overrides those methods, it can hijack control at
+crucial points during program execution to do what it needs to do.
+
+Since `PGLogger` does similar things regardless of why execution was paused (function call, return, exception, or single-step),
+all handlers dispatch to a giant method called `interaction`.
+
+During a call to `interaction`, the backend collects the state of the stack and all run-time data and then creates a
+trace entry (`trace_entry` dict). Then it appends `trace_entry` onto `self.trace`:
+
+```python
+self.trace.append(trace_entry)
+```
+
+Every time bdb pauses the user's program's execution and dispatches to `interaction` in `PGLogger`, one new trace
+entry is created. At the end of execution, `self.trace` contains as many trace entries as there were "steps"
+in the user's program execution.
+(To guard against infinite loops, `PGLogger` terminates execution when `MAX_EXECUTED_LINES` steps have been executed.)
 

From 506134d4ec1451cea548052b6ae31c3227ef676f Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 19:15:17 -0700
Subject: [PATCH 367/502] Update v3/docs/developer-overview.md

---
 v3/docs/developer-overview.md | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index b278de022..81fa602e9 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -93,7 +93,7 @@ web_exec.py - example CGI script for deploying backend on CGI-enabled webservers
 
 The backend works with both Python 2 and 3.
 
-## Hacking on the backend
+## Hacking the backend
 
 To modify the backend, you will mainly need to understand `pg_logger.py` and `pg_encoder.py`.
 
@@ -205,7 +205,10 @@ It executes the contents of `script_str` in a modified global environment (`user
 Ok, the debugger has just started executing the program that the user passed in (from `example.py` in our example).
 What happens now? Here's where the magic happens. Look at the methods called
 `user_call`, `user_return`, `user_exception`, and `user_line`. Again, those are all
-[inherited from bdb.Bdb](http://docs.python.org/library/bdb.html#bdb). As the user's program is running, bdb
+[inherited from bdb.Bdb](http://docs.python.org/library/bdb.html#bdb.Bdb);
+take a minute to read up on what they're supposed to do.
+
+As the user's program is running, bdb
 will pause execution at every function call, return, exception, and single-step and transfer control
 over to the respective handler methods. Since `PGLogger` overrides those methods, it can hijack control at
 crucial points during program execution to do what it needs to do.
@@ -225,3 +228,12 @@ entry is created. At the end of execution, `self.trace` contains as many trace e
 in the user's program execution.
 (To guard against infinite loops, `PGLogger` terminates execution when `MAX_EXECUTED_LINES` steps have been executed.)
 
+### Execution Trace Format
+
+A lot of complicated stuff happens within `interaction` to grab a snapshot of the execution state and encode
+it into an execution trace entry. I've written up a separate document describing the exact format of an execution trace:
+
+
+## Hacking the frontend
+
+(TODO: write me sometime!)
\ No newline at end of file

From aa620a2d3b7f29c36161ac65df56bee7d72cd53e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 19:18:10 -0700
Subject: [PATCH 368/502] bah

---
 v3/docs/opt-trace-format.md  | 25 +++++++++++++++++++++++++
 v3/docs/opt-trace-format.txt |  6 ------
 2 files changed, 25 insertions(+), 6 deletions(-)
 create mode 100644 v3/docs/opt-trace-format.md
 delete mode 100644 v3/docs/opt-trace-format.txt

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
new file mode 100644
index 000000000..251f52211
--- /dev/null
+++ b/v3/docs/opt-trace-format.md
@@ -0,0 +1,25 @@
+# Execution Trace Format
+
+This document describes the execution trace format that serves as the
+interface between the frontend and backend of Online Python Tutor
+(thereafter abbreviated as OPT).
+
+It is a starting point for anyone who wants to create a different
+backend (e.g., for another programming language) or a different frontend
+(e.g., for visually-impaired students). View it online at:
+
+https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/opt-trace-format.md
+
+Look at the Git history to see when this document was last updated; the
+more time elapsed since that date, the more likely things are
+out-of-date.
+
+I'm assuming that you're competent in Python, JSON, command-line-fu, and
+Google-fu. Feel free to email philip@pgbovine.net if you have questions.
+
+And please excuse the sloppy writing; I'm not trying to win any style awards here :)
+
+
+## Trace Overview
+
+(TODO: write me sometime!)
diff --git a/v3/docs/opt-trace-format.txt b/v3/docs/opt-trace-format.txt
deleted file mode 100644
index 45d8617bf..000000000
--- a/v3/docs/opt-trace-format.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-Online Python Tutor execution trace format
-------
-
-[TODO: write me!]
-
-[TODO: move to GitHub Markdown format]

From 47ad26cc4337c72fea8bc39427f6ccc8a4b7dae8 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 19:18:48 -0700
Subject: [PATCH 369/502] Update v3/docs/developer-overview.md

---
 v3/docs/developer-overview.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index 81fa602e9..0eed09985 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -233,6 +233,8 @@ in the user's program execution.
 A lot of complicated stuff happens within `interaction` to grab a snapshot of the execution state and encode
 it into an execution trace entry. I've written up a separate document describing the exact format of an execution trace:
 
+https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/opt-trace-format.md
+
 
 ## Hacking the frontend
 

From 392e9f457d4862a244aa4fc90c83c4533464f324 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 19:23:08 -0700
Subject: [PATCH 370/502] Update v3/docs/developer-overview.md

lazy eval
---
 v3/docs/developer-overview.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index 0eed09985..80519f678 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -236,6 +236,12 @@ it into an execution trace entry. I've written up a separate document describing
 https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/opt-trace-format.md
 
 
+### Backend regression tests
+
+If you're paranoid about your backend changes breaking stuff, please bug me, and I'll write up docs
+on how to run the regression test suite.
+
+
 ## Hacking the frontend
 
 (TODO: write me sometime!)
\ No newline at end of file

From 0c99555561933a70be308e253d7d1e52b4cc2ab0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 20:11:17 -0700
Subject: [PATCH 371/502] bah

---
 README | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/README b/README
index 563673bad..8ed37cb90 100644
--- a/README
+++ b/README
@@ -1,6 +1,9 @@
 Online Python Tutor
+
+http://pythontutor.com/
 https://github.com/pgbovine/OnlinePythonTutor/
 
+
 Copyright (C) 2010-2012 Philip J. Guo (philip@pgbovine.net)
 
 Permission is hereby granted, free of charge, to any person obtaining a
@@ -31,9 +34,9 @@ Summary:
   step forwards and backwards through execution to view the run-time
   state of data structures.
 
-  Over 100,000 people have used Online Python Tutor to understand and
-  debug their programs, often as a supplement to textbooks, lecture
-  notes, and online programming tutorials.
+  So far, over 100,000 people have used Online Python Tutor to
+  understand and debug their programs, often as a supplement to
+  textbooks, lecture notes, and online programming tutorials.
 
 ---
 

From ddb5d7e612a975509c4ffb7efb8f49e54f762f09 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 20:15:32 -0700
Subject: [PATCH 372/502] Update v3/docs/developer-overview.md

---
 v3/docs/developer-overview.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index 80519f678..9fa09061c 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -1,4 +1,4 @@
-# Developer's Guide Overview
+# Overview for Developers
 
 This document is a starting point for anyone who wants to hack on
 Online Python Tutor (thereafter abbreviated as OPT). View it online at:
@@ -11,7 +11,7 @@ elapsed since that date, the more likely things are out-of-date.
 I'm assuming that you're competent in Python, JavaScript, command-line-fu, and Google-fu,
 so I won't do much hand-holding in these directions.
 
-This guy isn't meant to be comprehensive; rather, it's just a starting point for learning about the code
+This guide isn't meant to be comprehensive; rather, it's just a starting point for learning about the code
 and development workflow. You will undoubtedly still be confused about details after reading it, so
 feel free to email philip@pgbovine.net if you have questions.
 

From c6ff50e4402673678a5a197e84e278a5107a9ef8 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 20:20:16 -0700
Subject: [PATCH 373/502] Update v3/docs/developer-overview.md

---
 v3/docs/developer-overview.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index 9fa09061c..a74345f8e 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -51,10 +51,10 @@ Here is a typical user interaction sequence:
 
 1. The user visits [visualize.html](http://pythontutor.com/visualize.html) and types in Python code in the web-based text editor.
 2. The user hits the "Visualize execution" button.
-3. The OPT frontend sends the user's Python code as a string to the backend by making an AJAX GET request.
-4. The backend executes the Python code under the supervision of the Python [bdb](http://docs.python.org/library/bdb.html) debugger, produces an execution trace, and send that trace back to the frontend in JSON format.
+3. The OPT frontend sends the user's Python code as a string to the backend by making an Ajax GET request.
+4. The backend executes the Python code under the supervision of the Python [bdb](http://docs.python.org/library/bdb.html) debugger, produces an execution trace, and sends that trace back to the frontend in JSON format.
 5. The frontend switches to a visualization display, parses the execution trace, and renders the appropriate stack frames, heap objects, and pointers.
-6. When the user interacts with the frontend by stepping through execution points (forwards and backwards), the frontend renders the proper data structures **without** making another subsequent call to the backend.
+6. When the user interacts with the frontend by stepping through execution points, the frontend renders the proper data structures **without** making another subsequent call to the backend.
 
 All relevant files are located in `OnlinePythonTutor/v3/`, since v3 is the currently-active version.
 

From 65912b2444da7a5e3fc2b006de17f100f68c7575 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 20:24:18 -0700
Subject: [PATCH 374/502] Update v3/docs/developer-overview.md

---
 v3/docs/developer-overview.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index a74345f8e..0e988dca9 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -113,21 +113,21 @@ python generate_json_trace.py example.py
 
 Doing so will print a JSON-formatted execution trace to stdout.
 This data is exactly what the backend sends to the frontend.
-(Actually not quite: the sent trace is actually compressed to eliminate all extraneous spaces and newlines.
+(Actually not quite: The sent trace is actually compressed to eliminate all extraneous spaces and newlines.
 But for testing purposes, I've made the trace more human-readable.)
 
 Second, when you're "print debugging" in the backend, you can't simply print to stdout, since `pg_logger.py`
 *redirects* stdout to a buffer. Instead, you need to write all of your print statements as:
 
 ```python
-print >> sys.stderr, 
+print >> sys.stderr, 
 ```
         
 so that the output goes to stderr.
 
 The easiest way to debug or investigate how some part of the code works is to **insert in print statements (to stderr)
 and then run `generate_json_trace.py` on small code examples**. Trust me -- being able to do this is way more
-effective than memorizing detailed documentation (which could be outdated by the time you read it!)
+effective than memorizing detailed documentation (which could be outdated by the time you read it).
 
 
 ### Backend control flow

From 574b49532a5e14774ed777cd1ae4ae7ee56d9695 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 20:26:05 -0700
Subject: [PATCH 375/502] Update v3/docs/developer-overview.md

---
 v3/docs/developer-overview.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index 0e988dca9..469f5033d 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -147,6 +147,7 @@ after the backend is done generating a trace.
 Let's look at how `generate_json_trace.py` calls `exec_script_str` (using a simplified version of its code):
 
 ```python
+# simplified version of generate_json_trace.py
 import pg_logger, json
 
 def json_finalizer(input_code, output_trace):

From b597fb8112a01baf96c9ab1ab76439e5d0c1063a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 20:31:52 -0700
Subject: [PATCH 376/502] Update v3/docs/developer-overview.md

---
 v3/docs/developer-overview.md | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index 469f5033d..734e8e42c 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -200,7 +200,7 @@ except SystemExit:
   raise bdb.BdbQuit
 ```
 
-The `run` method is actually [inherited from bdb.Bdb](http://docs.python.org/library/bdb.html#bdb.Bdb.run).
+The `self.run` method is actually [inherited from bdb.Bdb](http://docs.python.org/library/bdb.html#bdb.Bdb.run).
 It executes the contents of `script_str` in a modified global environment (`user_globals`).
 
 Ok, the debugger has just started executing the program that the user passed in (from `example.py` in our example).
@@ -210,11 +210,12 @@ What happens now? Here's where the magic happens. Look at the methods called
 take a minute to read up on what they're supposed to do.
 
 As the user's program is running, bdb
-will pause execution at every function call, return, exception, and single-step and transfer control
-over to the respective handler methods. Since `PGLogger` overrides those methods, it can hijack control at
+will pause execution at every function call, return, exception, and single-line step (most common).
+It then transfers control over to the respective handler method.
+Since `PGLogger` overrides those handler methods, it can hijack control at
 crucial points during program execution to do what it needs to do.
 
-Since `PGLogger` does similar things regardless of why execution was paused (function call, return, exception, or single-step),
+Since `PGLogger` does similar things regardless of why execution was paused (function call, return, exception, or single-line step),
 all handlers dispatch to a giant method called `interaction`.
 
 During a call to `interaction`, the backend collects the state of the stack and all run-time data and then creates a
@@ -226,13 +227,15 @@ self.trace.append(trace_entry)
 
 Every time bdb pauses the user's program's execution and dispatches to `interaction` in `PGLogger`, one new trace
 entry is created. At the end of execution, `self.trace` contains as many trace entries as there were "steps"
-in the user's program execution.
+in the user's program execution. Each step more-or-less corresponds to one line being executed.
 (To guard against infinite loops, `PGLogger` terminates execution when `MAX_EXECUTED_LINES` steps have been executed.)
 
 ### Execution Trace Format
 
 A lot of complicated stuff happens within `interaction` to grab a snapshot of the execution state and encode
-it into an execution trace entry. I've written up a separate document describing the exact format of an execution trace:
+it into an execution trace entry. Insert a bunch of print statements (remember, to stderr) to get a sense of what's going on.
+
+In addition, I've written up a separate document describing the exact format of an execution trace:
 
 https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/opt-trace-format.md
 

From 5a5c139068f8cc3fc7c5bc74ad73c61773ad7da1 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 17 Sep 2012 20:32:48 -0700
Subject: [PATCH 377/502] Update v3/docs/opt-trace-format.md

---
 v3/docs/opt-trace-format.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
index 251f52211..a69c27a59 100644
--- a/v3/docs/opt-trace-format.md
+++ b/v3/docs/opt-trace-format.md
@@ -22,4 +22,7 @@ And please excuse the sloppy writing; I'm not trying to win any style awards her
 
 ## Trace Overview
 
+Before you continue reading, I suggest for you to first skim the Overview for Developers doc:
+https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/developer-overview.md
+
 (TODO: write me sometime!)

From 0bb590a608aa1e25a110f86955ed7c2ead08295e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 07:14:44 -0700
Subject: [PATCH 378/502] Update v3/docs/user-FAQ.md

---
 v3/docs/user-FAQ.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/v3/docs/user-FAQ.md b/v3/docs/user-FAQ.md
index 4e65eef8a..c075c6dcf 100644
--- a/v3/docs/user-FAQ.md
+++ b/v3/docs/user-FAQ.md
@@ -9,6 +9,12 @@ if we were truly faithful to Python's semantics, that would result in far too ma
 However, note that since primitives are **immutable** and thus behave identically regardless of aliasing,
 it doesn't matter whether they're rendered in the stack or heap.
 
+#### Whoa, I get an unknown error when I try to use the `re` module (or other modules)
+
+Yep, I currently have limited support for external modules. The only module functions that work
+are those involving native C function calls (e.g., "import math; x = math.sqrt(9)"). Making pure-Python
+function calls in modules will lead to an unknown error.
+
 
 #### Visualizations of object-oriented programs are confusing; why are there grayed-out frames everywhere?
 

From 030db3424c54043b0e09789c87606eba67288d45 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 07:25:22 -0700
Subject: [PATCH 379/502] Update v3/docs/user-FAQ.md

---
 v3/docs/user-FAQ.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/v3/docs/user-FAQ.md b/v3/docs/user-FAQ.md
index c075c6dcf..00cf5405c 100644
--- a/v3/docs/user-FAQ.md
+++ b/v3/docs/user-FAQ.md
@@ -11,9 +11,9 @@ it doesn't matter whether they're rendered in the stack or heap.
 
 #### Whoa, I get an unknown error when I try to use the `re` module (or other modules)
 
-Yep, I currently have limited support for external modules. The only module functions that work
-are those involving native C function calls (e.g., "import math; x = math.sqrt(9)"). Making pure-Python
-function calls in modules will lead to an unknown error.
+Yep, Online Python Tutor currently has very limited support for external modules. The only module functions that work
+are those involving native C function calls (e.g., "import math; x = math.sqrt(9)"). Making **pure-Python
+function calls** in external modules will lead to an unknown error.
 
 
 #### Visualizations of object-oriented programs are confusing; why are there grayed-out frames everywhere?

From aa9881fda455d2cf4f5003189f07055b7b9afd38 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 07:26:04 -0700
Subject: [PATCH 380/502] Update v3/docs/user-FAQ.md

---
 v3/docs/user-FAQ.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/v3/docs/user-FAQ.md b/v3/docs/user-FAQ.md
index 00cf5405c..80f47dbd8 100644
--- a/v3/docs/user-FAQ.md
+++ b/v3/docs/user-FAQ.md
@@ -20,9 +20,9 @@ function calls** in external modules will lead to an unknown error.
 
 We haven't "cleaned-up" the visualizations to look better for OOP code examples;
 they are simply displaying what Python is doing step-by-step as those programs execute.
-Please email if you have suggestions for more aesthetically-pleasing yet accurate visualizations.
+Please email if you have suggestions for more aesthetically-pleasing yet accurate OOP visualizations.
 
 
 #### Did you know that stepping through code with generators looks weird when "display frames of exited functions" is selected?
 
-Yes, this is a known bug, but sadly the fix isn't straightforward at the moment.
+Yep, this is a known bug, but sadly the fix isn't straightforward at the moment.

From 7b486974a6ceb16e83c30b392a0a0759a0699a2b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 09:57:25 -0700
Subject: [PATCH 381/502] Update v3/docs/opt-trace-format.md

---
 v3/docs/opt-trace-format.md | 194 +++++++++++++++++++++++++++++++++++-
 1 file changed, 193 insertions(+), 1 deletion(-)

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
index a69c27a59..1f1c35d78 100644
--- a/v3/docs/opt-trace-format.md
+++ b/v3/docs/opt-trace-format.md
@@ -25,4 +25,196 @@ And please excuse the sloppy writing; I'm not trying to win any style awards her
 Before you continue reading, I suggest for you to first skim the Overview for Developers doc:
 https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/developer-overview.md
 
-(TODO: write me sometime!)
+Pay particular attention to what `generate_json_trace.py` is and how to run it:
+https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/developer-overview.md#two-quick-tips-for-starters
+
+Let's start with a simple example. Create an `example.py` file with the following contents:
+```python
+x = 5
+y = 10
+z = x + y
+```
+
+Now run:
+```
+python generate_json_trace.py example.py
+```
+
+and you should see the following output:
+```javascript
+{
+  "code": "x = 5\ny = 10\nz = x + y\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": 5
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": 10, 
+        "x": 5
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "z": 15
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "return"
+    }
+  ]
+}
+```
+
+Recall that when OPT is deployed on a webserver, the backend generates this trace and sends it to the frontend,
+where it will be turned into a visualization.
+
+[Click here](http://pythontutor.com/visualize.html#code=x+%3D+5%0Ay+%3D+10%0Az+%3D+x+%2B+y&mode=display&cumulative=false&py=2&curInstr=0)
+to see the visualization of this trace (open it in a new window if possible).
+Note that the trace object contains *all* of the information required to create this visualization.
+
+The trace is a JSON object with two fields: `code` is the string contents of the code
+to be visualized, and `trace` is the actual execution trace, which consists of a list of execution points.
+
+In the above example, `trace` is a list of four elements since there are four execution points.
+If you step through the visualization, you'll notice that there are exactly four steps, one for each
+element of the `trace` list.
+(Sometimes the frontend will filter out some redundant entries in `trace`, but a simplifying assumption
+is that `trace.length` is the number of execution steps that the frontend renders.)
+
+Ok, still with me? Let's now dig into what an individual element in `trace` looks like.
+
+
+## Execution Point Objects
+
+The central type of object in a trace is an "execution point", which represents the state of the computer's (abstract)
+memory at a certain point in execution. Recall that a trace is an ordered list of execution points.
+
+The key concept to understand is that the frontend renders an execution point by simply looking at
+the contents of the corresponding execution point object, **without consulting any of its neighbors**.
+
+Ok, let's now look at the **four** execution points in our above example in order. The first point
+is what the frontend visualizes when it says "Step 1 of 3":
+
+```javascript
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }
+```
+
+This is pretty much what an "empty" execution point object looks like. `line` shows the line number of the
+line that is *about to execute*, which is line 1 in this case. And `event` is `step_line`, which indicates
+that an ordinary single-line step event is about to occur. `func_name` is the function that's currently
+executing: In this case, `` is the faux name for top-level code that's not in any function.
+All of the other fields are empty, and if you look at the visualization, nothing is rendered in the "Frames"
+or "Objects" panes.
+
+Ok now let's look at the second point, which corresponds to the frontend visualization when it says
+"Step 2 of 3":
+
+```javascript
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": 5
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }
+```
+
+
+
+```javascript
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": 10, 
+        "x": 5
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }
+```
+
+```javascript
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "z": 15
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "return"
+    }
+```
\ No newline at end of file

From edceec1ea1b0619d0e28ee2a91aab50ab92b468f Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 10:04:57 -0700
Subject: [PATCH 382/502] Update v3/docs/opt-trace-format.md

---
 v3/docs/opt-trace-format.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
index 1f1c35d78..d267c82bb 100644
--- a/v3/docs/opt-trace-format.md
+++ b/v3/docs/opt-trace-format.md
@@ -177,6 +177,12 @@ Ok now let's look at the second point, which corresponds to the frontend visuali
     }
 ```
 
+Ok note that `line` is now 2, which means that line 2 is *about* to execute (yes, this convention is a bit confusing,
+but it's what the bdb debugger gives us). `globals` is now populated with one key-value pair: the global variable
+`x` has a value of `5`. That makes sense since we just executed line 1 (from the previous execution point),
+which was the code `x = 5`. If you look at the
+[visualization at this step](http://pythontutor.com/visualize.html#code=x+%3D+5%0Ay+%3D+10%0Az+%3D+x+%2B+y&mode=display&cumulative=false&py=2&curInstr=1),
+you'll see that `x` has been assigned to `5`.
 
 
 ```javascript

From b046cd53be61713e967c09cc707f86a16a43d66f Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 10:14:40 -0700
Subject: [PATCH 383/502] Update v3/docs/opt-trace-format.md

---
 v3/docs/opt-trace-format.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
index d267c82bb..1d1eeb727 100644
--- a/v3/docs/opt-trace-format.md
+++ b/v3/docs/opt-trace-format.md
@@ -184,6 +184,8 @@ which was the code `x = 5`. If you look at the
 [visualization at this step](http://pythontutor.com/visualize.html#code=x+%3D+5%0Ay+%3D+10%0Az+%3D+x+%2B+y&mode=display&cumulative=false&py=2&curInstr=1),
 you'll see that `x` has been assigned to `5`.
 
+Ok let's keep marching to the next execution point, which is the one that corresponds to "Step 3 of 3"
+in the frontend:
 
 ```javascript
     {
@@ -204,6 +206,20 @@ you'll see that `x` has been assigned to `5`.
     }
 ```
 
+Now `line` is 3, because we're about to execute line 3 (we just executed lines 1 and 2). Notice that there is a
+new key-value pair in`globals` showing that `y` has been assigned to `10`. No surprises here, since we just
+executed the line `y = 10`.
+
+Ok now this is where I want to talk about `ordered_globals`, which is a list of global variables (i.e.,
+keys in `globals`) in the order that the frontend should visualize them. The backend appends variable
+names in their order of appearance throughout execution. Why is this list necessary? Because `globals`
+is an object whose keys are unsorted, so if you don't also keep an `ordered_globals` sorted list,
+then the visualization might end up being jarring. For instance, at one execution point, it might
+render `x` and then `y`, and at the next execution point, it might render `y` and then `x`, thereby
+causing the visualization to "jitter" unnecessarily. And I've found that it looks aesthetically pleasing
+when variables are sorted in their order of appearance as you step forwards through execution.
+
+
 ```javascript
     {
       "ordered_globals": [

From 29fd17085a019b864dc6a7ede885883cf1fe131b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 10:22:22 -0700
Subject: [PATCH 384/502] Update v3/docs/opt-trace-format.md

---
 v3/docs/opt-trace-format.md | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
index 1d1eeb727..591f8c3bf 100644
--- a/v3/docs/opt-trace-format.md
+++ b/v3/docs/opt-trace-format.md
@@ -219,6 +219,9 @@ render `x` and then `y`, and at the next execution point, it might render `y` an
 causing the visualization to "jitter" unnecessarily. And I've found that it looks aesthetically pleasing
 when variables are sorted in their order of appearance as you step forwards through execution.
 
+Still with me? Ok, let's get to the final execution point, which corresponds to the frontend displaying
+"Program terminated" ([click here](http://pythontutor.com/visualize.html#code=x+%3D+5%0Ay+%3D+10%0Az+%3D+x+%2B+y&mode=display&cumulative=false&py=2&curInstr=3)
+to jump directly there).
 
 ```javascript
     {
@@ -239,4 +242,14 @@ when variables are sorted in their order of appearance as you step forwards thro
       "line": 3, 
       "event": "return"
     }
-```
\ No newline at end of file
+```
+
+This time, the event is a `return`, which signifies "returning" from the top-level module code (meaning the program
+has terminated). Note that now there is another new variable `z`, which is bound to `15` since `z = x + y` just executed.
+Note that, again, `ordered_globals` shows all three variables in their order of appearance.
+
+Ok, that's it for the basic tour!
+
+## Heap Objects
+
+## Function Stack Frames

From 04000150bdf4f6481b25a7027523dcf9e57b7fa4 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 10:46:47 -0700
Subject: [PATCH 385/502] Update v3/docs/opt-trace-format.md

---
 v3/docs/opt-trace-format.md | 52 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 51 insertions(+), 1 deletion(-)

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
index 591f8c3bf..3bdffebac 100644
--- a/v3/docs/opt-trace-format.md
+++ b/v3/docs/opt-trace-format.md
@@ -248,8 +248,58 @@ This time, the event is a `return`, which signifies "returning" from the top-lev
 has terminated). Note that now there is another new variable `z`, which is bound to `15` since `z = x + y` just executed.
 Note that, again, `ordered_globals` shows all three variables in their order of appearance.
 
-Ok, that's it for the basic tour!
+Ok, that's it for the basic tour. Next let's talk about what happens when the `heap` field isn't empty.
+
 
 ## Heap Objects
 
+The previous example contained only primitive values that JSON could encode directly within the `globals` object.
+JSON natively supports numbers, strings, and boolean values (which map well to Python's "primitive" data types).
+But what happens when the user's program contains compound
+Python data types such as lists, tuples, dicts, sets, etc.?
+
+Create an `example.py` file with the following contents:
+```python
+x = [1, 2, 3]
+y = ('Alice', 'Bob', 'Cindy')
+z = {'carrot': 'vegetable', 'mouse': 'animal', 'rock': 'mineral'}
+```
+
+You should know how to generate a trace by now. The trace again contains **four** elements since there are
+four execution steps (one for the very beginning of execution plus three executed lines).
+
+"Step 1 of 3" is boring since nothing is displayed. Let's jump to "Step 2 of 3"
+([click here](http://pythontutor.com/visualize.html#code=x+%3D+%5B1,+2,+3%5D%0Ay+%3D+('Alice',+'Bob',+'Cindy')%0Az+%3D+%7B'carrot'%3A+'vegetable',+'mouse'%3A+'animal',+'rock'%3A+'mineral'%7D%0A&mode=display&cumulative=false&py=2&curInstr=1))
+
+The visualization shows that `x` points to a list containing `[1, 2, 3]`. This is the corresponding execution
+point object:
+
+```javascript
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2, 
+          3
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }
+```
+
+
 ## Function Stack Frames

From dab9d553a5afa9d4b70d44e86d1d14270b0da348 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 11:01:42 -0700
Subject: [PATCH 386/502] Update v3/docs/opt-trace-format.md

---
 v3/docs/opt-trace-format.md | 77 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 75 insertions(+), 2 deletions(-)

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
index 3bdffebac..156cf7e12 100644
--- a/v3/docs/opt-trace-format.md
+++ b/v3/docs/opt-trace-format.md
@@ -269,9 +269,9 @@ You should know how to generate a trace by now. The trace again contains **four*
 four execution steps (one for the very beginning of execution plus three executed lines).
 
 "Step 1 of 3" is boring since nothing is displayed. Let's jump to "Step 2 of 3"
-([click here](http://pythontutor.com/visualize.html#code=x+%3D+%5B1,+2,+3%5D%0Ay+%3D+('Alice',+'Bob',+'Cindy')%0Az+%3D+%7B'carrot'%3A+'vegetable',+'mouse'%3A+'animal',+'rock'%3A+'mineral'%7D%0A&mode=display&cumulative=false&py=2&curInstr=1))
+(click here)
 
-The visualization shows that `x` points to a list containing `[1, 2, 3]`. This is the corresponding execution
+The visualization now shows `x` pointing to a list containing `[1, 2, 3]`. This is the corresponding execution
 point object:
 
 ```javascript
@@ -301,5 +301,78 @@ point object:
     }
 ```
 
+Note that in `globals`, `x` now refers to a `["REF", 1]` object, which means a *reference* (pointer) to a heap
+object with an ID of 1.
+
+Let's now look at `heap`, which is a mapping of heap object IDs to their contents. The current heap has one
+object with an ID of 1. That object is a list of [1, 2, 3], which is represented as:
+
+```javascript
+["LIST", 1, 2, 3]
+```
+
+Let's skip forward to the end of execution ("Program terminated"):
+(click here)
+
+Now there are three variables -- `x` points to a list, `y` points to a tuple, and `z` points to a dict.
+This execution point object is getting kinda big:
+
+```javascript
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          2
+        ], 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "z": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2, 
+          3
+        ], 
+        "2": [
+          "TUPLE", 
+          "Alice", 
+          "Bob", 
+          "Cindy"
+        ], 
+        "3": [
+          "DICT", 
+          [
+            "carrot", 
+            "vegetable"
+          ], 
+          [
+            "mouse", 
+            "animal"
+          ], 
+          [
+            "rock", 
+            "mineral"
+          ]
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }
+```
 
 ## Function Stack Frames

From 15d0790dba747fe74e8efcab53c51a6460152bb0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 11:14:15 -0700
Subject: [PATCH 387/502] Update v3/docs/opt-trace-format.md

---
 v3/docs/opt-trace-format.md | 108 ++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
index 156cf7e12..002f6f1b2 100644
--- a/v3/docs/opt-trace-format.md
+++ b/v3/docs/opt-trace-format.md
@@ -375,4 +375,112 @@ This execution point object is getting kinda big:
     }
 ```
 
+Note that in `globals`, `x` refers to heap object 1, `y` to heap object 2, and `z` to 3. If you then look at `heap`,
+you'll see that objects 1, 2, and 3 map to the corresponding list, tuple, and dict, respectively.
+
+Look at the comments at the top of `pg_encoder.py` to learn the encoding format for various Python data types:
+
+https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/pg_encoder.py
+
+## Heap-to-Heap References
+
+In the above example, the heap objects contained only primitives (numbers and strings), which can be directly
+encoded within those objects' representations in `heap`.
+
+But heap objects can themselves point to other heap objects. Let's look at the following example:
+
+```python
+c = (1, (2, None))
+d = (1, c)
+```
+
+Jump to the end of execution and notice that:
+
+- `c` points to a tuple
+- the second element of that tuple points to another tuple
+- `d` points to a tuple whose second element points to what `c` points to
+
+Let's look at the execution point object that corresponds to this visualization:
+
+```javascript
+    {
+      "ordered_globals": [
+        "c", 
+        "d"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "c": [
+          "REF", 
+          1
+        ], 
+        "d": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          2, 
+          null
+        ], 
+        "3": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            1
+          ]
+        ]
+      }, 
+      "line": 2, 
+      "event": "return"
+    }
+```
+
+What's going on here? Let's start with `globals` again. `c` points to heap object 1 (`["REF", 1]`), and `d` points
+to heap object 3 (`["REF", 3]`).
+
+Let's now look at `heap`. Heap object 1 is:
+
+```javascript
+["TUPLE", 1, ["REF", 2]]
+```
+
+What does this mean? It means that it represents a tuple whose first element is the number `1` and whose
+second element is a reference (pointer) to heap object 2.
+
+Ok let's look at heap object 2:
+
+```javascript
+["TUPLE", 2, null]
+```
+
+which corresponds to the Python tuple object `(2, None)`.
+
+Finally, heap object 3 (which `d` points to) is:
+
+```javascript
+["TUPLE", 1, ["REF", 1]]
+```
+
+which corresponds to the Python object `(1, c)`.
+
+The ability to put "REF" objects inside of heap objects enables an arbitrary object graph to be
+represented in the execution trace.
+
+
 ## Function Stack Frames
+
+(TODO: WRITE ME!)

From 29e224690466fe20c9c99d7ca47b656662bf328b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 11:26:44 -0700
Subject: [PATCH 388/502] Update v3/docs/opt-trace-format.md

---
 v3/docs/opt-trace-format.md | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
index 002f6f1b2..4ee3594e3 100644
--- a/v3/docs/opt-trace-format.md
+++ b/v3/docs/opt-trace-format.md
@@ -305,14 +305,14 @@ Note that in `globals`, `x` now refers to a `["REF", 1]` object, which means a *
 object with an ID of 1.
 
 Let's now look at `heap`, which is a mapping of heap object IDs to their contents. The current heap has one
-object with an ID of 1. That object is a list of [1, 2, 3], which is represented as:
+object with an ID of 1. That object is a list of [1, 2, 3], which is encoded in JSON as:
 
 ```javascript
 ["LIST", 1, 2, 3]
 ```
 
 Let's skip forward to the end of execution ("Program terminated"):
-(click here)
+click here
 
 Now there are three variables -- `x` points to a list, `y` points to a tuple, and `z` points to a dict.
 This execution point object is getting kinda big:
@@ -378,10 +378,13 @@ This execution point object is getting kinda big:
 Note that in `globals`, `x` refers to heap object 1, `y` to heap object 2, and `z` to 3. If you then look at `heap`,
 you'll see that objects 1, 2, and 3 map to the corresponding list, tuple, and dict, respectively.
 
-Look at the comments at the top of `pg_encoder.py` to learn the encoding format for various Python data types:
+Look at the comments at the top of `pg_encoder.py` to learn the JSON encoding formats for various Python data types:
 
 https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/pg_encoder.py
 
+The basic idea behind the encoding format is that each compound object is encoded as a JSON list
+where the first element is a string "tag" identifying its type (e.g., "LIST", "TUPLE", "DICT").
+
 ## Heap-to-Heap References
 
 In the above example, the heap objects contained only primitives (numbers and strings), which can be directly

From 672804bb68f938d8fb0aac23a585d860230f76f3 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 11:38:29 -0700
Subject: [PATCH 389/502] Update v3/docs/opt-trace-format.md

---
 v3/docs/opt-trace-format.md | 82 +++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
index 4ee3594e3..e79a12a30 100644
--- a/v3/docs/opt-trace-format.md
+++ b/v3/docs/opt-trace-format.md
@@ -483,7 +483,89 @@ which corresponds to the Python object `(1, c)`.
 The ability to put "REF" objects inside of heap objects enables an arbitrary object graph to be
 represented in the execution trace.
 
+## stdout output
+
+The `stdout` field in an execution point object represents the sum total of all output sent to stdout
+so far during execution. For example, given this program:
+
+```python
+print 1
+print "two"
+print (3, 4, 5)
+```
+
+The complete trace object is:
+
+```javascript
+{
+  "code": "print 1\nprint \"two\"\nprint (3, 4, 5)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "1\ntwo\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "1\ntwo\n(3, 4, 5)\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "return"
+    }
+  ]
+}
+```
+
+By now you should be getting pretty good at reading these objects :)
+
+Let's just focus on the `stdout` field at each execution point. Note that its contents start as an empty string
+at the beginning of execution and then grow incrementally as more stuff is printed to stdout at each
+subsequent execution point. If we grep for `stdout` in the trace, we see the following progression:
+
+```javascript
+      "stdout": "", 
+      "stdout": "1\n", 
+      "stdout": "1\ntwo\n", 
+      "stdout": "1\ntwo\n(3, 4, 5)\n", 
+```
+
+This isn't rocket science; but just be aware that `stdout` contains the cumulative contents of the stdout
+buffer up to that execution point, not only what's just been printed by the last executed line.
+
 
 ## Function Stack Frames
 
 (TODO: WRITE ME!)
+
+
+## Closures and Zombie Frames (advanced)
+
+(TODO: WRITE ME!)

From 257c1d55f024c89f719c225923dad55c676f0edf Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 11:43:19 -0700
Subject: [PATCH 390/502] Update v3/docs/opt-trace-format.md

---
 v3/docs/opt-trace-format.md | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
index e79a12a30..8f6bf4ba4 100644
--- a/v3/docs/opt-trace-format.md
+++ b/v3/docs/opt-trace-format.md
@@ -483,7 +483,8 @@ which corresponds to the Python object `(1, c)`.
 The ability to put "REF" objects inside of heap objects enables an arbitrary object graph to be
 represented in the execution trace.
 
-## stdout output
+
+## Capturing `stdout` Output
 
 The `stdout` field in an execution point object represents the sum total of all output sent to stdout
 so far during execution. For example, given this program:
@@ -558,7 +559,7 @@ subsequent execution point. If we grep for `stdout` in the trace, we see the fol
 ```
 
 This isn't rocket science; but just be aware that `stdout` contains the cumulative contents of the stdout
-buffer up to that execution point, not only what's just been printed by the last executed line.
+buffer up to that execution point, not only what's been printed by the most recently executed line.
 
 
 ## Function Stack Frames

From 4c66e667e75c08c0ca8c7b5b76d7717348a2e706 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 13:33:15 -0700
Subject: [PATCH 391/502] Update v3/docs/opt-trace-format.md

---
 v3/docs/opt-trace-format.md | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
index 8f6bf4ba4..7c42fc502 100644
--- a/v3/docs/opt-trace-format.md
+++ b/v3/docs/opt-trace-format.md
@@ -564,8 +564,24 @@ buffer up to that execution point, not only what's been printed by the most rece
 
 ## Function Stack Frames
 
-(TODO: WRITE ME!)
+So far our example programs contained no function calls. Let's now kick it up a notch and see an example
+with function calls:
+
+```python
+def foo(x, y, z):
+  return bar(x, y)
+  
+def bar(a, b):
+  return baz(a)
+  
+def baz(c):
+  return c
+  
+result = foo(1, 2, 3)
+```
 
+Let's jump straight to [Step 8 of 10](http://pythontutor.com/visualize.html#code=def+foo(x,+y,+z)%3A%0A++return+bar(x,+y)%0A++%0Adef+bar(a,+b)%3A%0A++return+baz(a)%0A++%0Adef+baz(c)%3A%0A++return+c%0A++%0Aresult+%3D+foo(1,+2,+3)%0A&mode=display&cumulative=false&py=2&curInstr=7)
+when the program is about to return from the call to `baz`.
 
 ## Closures and Zombie Frames (advanced)
 

From 9bab1440f38fd30856cde085251f7d5a70b4c312 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 13:51:56 -0700
Subject: [PATCH 392/502] Update v3/docs/opt-trace-format.md

---
 v3/docs/opt-trace-format.md | 153 +++++++++++++++++++++++++++++++++++-
 1 file changed, 152 insertions(+), 1 deletion(-)

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
index 7c42fc502..f9cecdf60 100644
--- a/v3/docs/opt-trace-format.md
+++ b/v3/docs/opt-trace-format.md
@@ -580,9 +580,160 @@ def baz(c):
 result = foo(1, 2, 3)
 ```
 
-Let's jump straight to [Step 8 of 10](http://pythontutor.com/visualize.html#code=def+foo(x,+y,+z)%3A%0A++return+bar(x,+y)%0A++%0Adef+bar(a,+b)%3A%0A++return+baz(a)%0A++%0Adef+baz(c)%3A%0A++return+c%0A++%0Aresult+%3D+foo(1,+2,+3)%0A&mode=display&cumulative=false&py=2&curInstr=7)
+Let's jump straight to Step 8 of 10,
 when the program is about to return from the call to `baz`.
 
+Study the visualization for a bit. Note that there are four frames currently on the stack: globals, `foo`, `bar`, and `baz`.
+Each frame consists of a name and a mapping between constituent variable names and values. There is a special
+variable called `Return value`, which represents the value that this function is about to return to its caller.
+
+Let's now look at the execution point object corresponding to this visualization:
+
+```javascript
+    {
+      "ordered_globals": [
+        "foo", 
+        "bar", 
+        "baz"
+      ], 
+      "stdout": "", 
+      "func_name": "baz", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "z": 3
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "z"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "a": 1, 
+            "b": 2
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "bar", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "bar_f2", 
+          "ordered_varnames": [
+            "a", 
+            "b"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "__return__": 1, 
+            "c": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "baz", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "baz_f3", 
+          "ordered_varnames": [
+            "c", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "bar": [
+          "REF", 
+          2
+        ], 
+        "foo": [
+          "REF", 
+          1
+        ], 
+        "baz": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(x, y, z)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "bar(a, b)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "baz(c)", 
+          null
+        ]
+      }, 
+      "line": 8, 
+      "event": "return"
+    }, 
+```
+
+First things first: This is a `return` event occurring on line 8 (the `return c` line in `baz`). The currently-active
+function is `baz`. There are three global variables: `foo`, `bar`, and `baz`, which all point to function objects
+on the heap.
+
+The only new kind of field is `stack_to_render`, which is (unsurprisingly) a list of stack frames to render.
+In this case, `stack_to_render` contains three elements -- the frames for `foo`, `bar`, and `baz`, in that exact order.
+The frontend simply walks down `stack_to_render` and renders each frame in a similar way that it renders global variables.
+
+Let's now zoom in on one particular frame in `stack_to_render`. Here is the frame for `bar`:
+
+```javascript
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "a": 1, 
+            "b": 2
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "bar", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "bar_f2", 
+          "ordered_varnames": [
+            "a", 
+            "b"
+          ]
+        }, 
+```
+
+For starters, `func_name` is the name of the function, and `is_highlighted` is true only if the current
+frame is the "top-most" one (telling the frontend to highlight it in a brighter color).
+
+`encoded_locals` is a mapping from local variable names to their values, similar to how `globals`
+provides a mapping from global variable names to their values.
+
+`ordered_varnames` is an ordered list of keys from `encoded_locals`, usually sorted by order of appearance
+during execution. The global analogue for this field is `ordered_globals`. (I suppose this field should be named
+`ordered_locals`, but I haven't gotten around to renaming yet.)
+
+
+(Ignore `is_parent`, `is_zombie`, and `parent_frame_id_list` for now. We'll cover those in the more advanced
+"Closures and Zombie Frames" section below.)
+
+
 ## Closures and Zombie Frames (advanced)
 
 (TODO: WRITE ME!)

From 502a1859da456434c0ab36ba57e17f19fdcc2fc2 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 14:05:30 -0700
Subject: [PATCH 393/502] Update v3/docs/opt-trace-format.md

---
 v3/docs/opt-trace-format.md | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
index f9cecdf60..f89fa3d90 100644
--- a/v3/docs/opt-trace-format.md
+++ b/v3/docs/opt-trace-format.md
@@ -729,9 +729,16 @@ provides a mapping from global variable names to their values.
 during execution. The global analogue for this field is `ordered_globals`. (I suppose this field should be named
 `ordered_locals`, but I haven't gotten around to renaming yet.)
 
+`frame_id` is a unique integer that identifies this frame; the first executed function gets an ID of 1, and then
+subsequent calls get successively increasing IDs.
 
-(Ignore `is_parent`, `is_zombie`, and `parent_frame_id_list` for now. We'll cover those in the more advanced
-"Closures and Zombie Frames" section below.)
+`unique_hash` is a unique string that identifies this frame. At this point, I don't remember clearly why
+this field is required in addition to `frame_id`, but nonetheless the frontend depends on it. A simple way
+to construct `unique_hash` is by concatenating the frame's function name with `frame_id`.
+(There's probably some subtle thing I'm forgetting at the moment, though ...)
+
+Finally, ignore `is_parent`, `is_zombie`, and `parent_frame_id_list` for now. We'll cover those in the more advanced
+"Closures and Zombie Frames" section below.
 
 
 ## Closures and Zombie Frames (advanced)

From 1172da6748c00e8a8742a0e003c557adc7f46692 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 14:07:59 -0700
Subject: [PATCH 394/502] Update v3/docs/opt-trace-format.md

---
 v3/docs/opt-trace-format.md | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
index f89fa3d90..c12492dd8 100644
--- a/v3/docs/opt-trace-format.md
+++ b/v3/docs/opt-trace-format.md
@@ -732,10 +732,10 @@ during execution. The global analogue for this field is `ordered_globals`. (I su
 `frame_id` is a unique integer that identifies this frame; the first executed function gets an ID of 1, and then
 subsequent calls get successively increasing IDs.
 
-`unique_hash` is a unique string that identifies this frame. At this point, I don't remember clearly why
-this field is required in addition to `frame_id`, but nonetheless the frontend depends on it. A simple way
+`unique_hash` is a unique string that identifies this frame. For now, a simple way
 to construct `unique_hash` is by concatenating the frame's function name with `frame_id`.
-(There's probably some subtle thing I'm forgetting at the moment, though ...)
+Note that `unique_hash` seems redundant with `frame_id`, since the latter is already unique.
+However, you'll see in the "Closures and Zombie Frames" section why `unique_hash` is required.
 
 Finally, ignore `is_parent`, `is_zombie`, and `parent_frame_id_list` for now. We'll cover those in the more advanced
 "Closures and Zombie Frames" section below.
@@ -744,3 +744,6 @@ Finally, ignore `is_parent`, `is_zombie`, and `parent_frame_id_list` for now. We
 ## Closures and Zombie Frames (advanced)
 
 (TODO: WRITE ME!)
+
+(TODO: talk about needing to append a '_p' and '_z' onto `unique_hash` when a frame becomes a parent or zombie,
+respectively, since the frontend needs to know when to refresh the display.)

From 890e1ef75ab3d02aef326854dacaf672a47590f0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 14:11:33 -0700
Subject: [PATCH 395/502] Update v3/docs/opt-trace-format.md

---
 v3/docs/opt-trace-format.md | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
index c12492dd8..2e01a61e9 100644
--- a/v3/docs/opt-trace-format.md
+++ b/v3/docs/opt-trace-format.md
@@ -585,7 +585,8 @@ when the program is about to return from the call to `baz`.
 
 Study the visualization for a bit. Note that there are four frames currently on the stack: globals, `foo`, `bar`, and `baz`.
 Each frame consists of a name and a mapping between constituent variable names and values. There is a special
-variable called `Return value`, which represents the value that this function is about to return to its caller.
+variable called `Return value` (stored in the trace as `__return__`),
+which represents the value that `baz` is about to return to its caller.
 
 Let's now look at the execution point object corresponding to this visualization:
 
@@ -745,5 +746,5 @@ Finally, ignore `is_parent`, `is_zombie`, and `parent_frame_id_list` for now. We
 
 (TODO: WRITE ME!)
 
-(TODO: talk about needing to append a '_p' and '_z' onto `unique_hash` when a frame becomes a parent or zombie,
+(TODO: talk about needing to append `_p` and `_z` onto `unique_hash` when a frame becomes a parent or zombie,
 respectively, since the frontend needs to know when to refresh the display.)

From 3f84eb443f02bbb1de18aaecc1e8b9497e253fbf Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 14:17:38 -0700
Subject: [PATCH 396/502] Update v3/docs/opt-trace-format.md

---
 v3/docs/opt-trace-format.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/v3/docs/opt-trace-format.md b/v3/docs/opt-trace-format.md
index 2e01a61e9..a6cf9dcfa 100644
--- a/v3/docs/opt-trace-format.md
+++ b/v3/docs/opt-trace-format.md
@@ -730,8 +730,8 @@ provides a mapping from global variable names to their values.
 during execution. The global analogue for this field is `ordered_globals`. (I suppose this field should be named
 `ordered_locals`, but I haven't gotten around to renaming yet.)
 
-`frame_id` is a unique integer that identifies this frame; the first executed function gets an ID of 1, and then
-subsequent calls get successively increasing IDs.
+`frame_id` is an integer that *uniquely* identifies this frame; the first function call (of *any* function) gets
+a frame ID of 1, and then subsequent calls get successively increasing frame IDs.
 
 `unique_hash` is a unique string that identifies this frame. For now, a simple way
 to construct `unique_hash` is by concatenating the frame's function name with `frame_id`.

From 37d37339f6d5750ce38a8081cb324bf50d764e70 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 15:08:46 -0700
Subject: [PATCH 397/502] v3 officially released!

---
 README | 52 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 51 insertions(+), 1 deletion(-)

diff --git a/README b/README
index 8ed37cb90..05c347ab2 100644
--- a/README
+++ b/README
@@ -39,7 +39,10 @@ Summary:
   textbooks, lecture notes, and online programming tutorials.
 
 ---
+All documentation is viewable online at:
+  https://github.com/pgbovine/OnlinePythonTutor/tree/master/v3/docs
 
+---
 Repository contents:
 
   tl;dr: the v3/ sub-directory contains the latest version of the code.
@@ -71,6 +74,7 @@ v1-v2/
   pg
   '''
 
+
   Online Python Tutor version 2 - released on October 4, 2011
   "Release" email to 13 friends:
 
@@ -98,8 +102,54 @@ v1-v2/
 
 v3/
 
-  Version 3 - Released on September ??, 2012
+  Online Python Tutor version 3 - Released on September 18 2012 to
+  153,000+ people on Google+:
+    https://plus.google.com/+ResearchatGoogle/posts/cseo9qi7LWq
 
+  "Release" announcement from the Research @ Google G+ account:
+  '''
+  Online Python Tutor: Web-Based Program Visualization for CS Education
+
+  As part of his CS education work at Google, +Philip Guo has been
+  developing an open-source educational tool called Online Python Tutor
+  (http://www.pythontutor.com). This tool enables teachers and students
+  to write Python programs directly in the web browser and then
+  single-step forwards and backwards to visualize what the computer is
+  doing as it executes those programs.
+
+  Program visualization for CS education is nothing new -- researchers
+  have been developing these sorts of tools for decades. However, most
+  of these tools never reach far beyond the confines of the researchers'
+  home universities due to the difficulty of installing and configuring
+  the visualization software. What makes Online Python Tutor unique and
+  effective is that it's the first known tool to adapt time-tested ideas
+  from the research literature (e.g., rendering of box-and-pointer
+  diagrams) for a web-based environment. Now anyone with a modern
+  browser can create, explore, and share their program visualizations by
+  simply visiting a web URL.
+
+  This ease of access has been a major contributor to adoption: So far,
+  over 100,000 people have used Online Python Tutor to understand and
+  debug their programs, often as a supplement to learning from
+  textbooks, lecture notes, and online programming tutorials. In
+  addition, instructors in over a dozen universities such as MIT, UC
+  Berkeley, and the University of Washington have used it for teaching
+  introductory computer science courses.
+
+  But this is just the beginning. Philip and his colleagues are now
+  building an online authoring environment so that, within the next few
+  months, teachers and students will be able to save their code snippets
+  and add annotations, discussion threads, lessons, and interactive
+  exercises on top of the associated visualizations.
+
+  They are also actively seeking partnerships with educators at all
+  grade levels to deploy and improve Online Python Tutor. Please contact
+  Philip directly or re-share this post with educators who might be
+  interested in working with this tool in any capacity.
+
+  Visit www.pythontutor.com to learn more and to start visualizing your
+  Python programs now!
+  '''
 
 ---
 

From 4051ac63cf53cf4ab1770ed6490f32bfd9c2f2bc Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 15:09:47 -0700
Subject: [PATCH 398/502] tiny

---
 README | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/README b/README
index 05c347ab2..914283cf9 100644
--- a/README
+++ b/README
@@ -102,8 +102,8 @@ v1-v2/
 
 v3/
 
-  Online Python Tutor version 3 - Released on September 18 2012 to
-  153,000+ people on Google+:
+  Online Python Tutor version 3 - Released on September 18, 2012
+  to 153,000+ people on Google+:
     https://plus.google.com/+ResearchatGoogle/posts/cseo9qi7LWq
 
   "Release" announcement from the Research @ Google G+ account:

From 2ea03d926e7558c9cf36e997bccf11e9033f2421 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 18 Sep 2012 17:47:26 -0700
Subject: [PATCH 399/502] Update v3/docs/user-FAQ.md

---
 v3/docs/user-FAQ.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/v3/docs/user-FAQ.md b/v3/docs/user-FAQ.md
index 80f47dbd8..f79b662d3 100644
--- a/v3/docs/user-FAQ.md
+++ b/v3/docs/user-FAQ.md
@@ -9,6 +9,12 @@ if we were truly faithful to Python's semantics, that would result in far too ma
 However, note that since primitives are **immutable** and thus behave identically regardless of aliasing,
 it doesn't matter whether they're rendered in the stack or heap.
 
+
+#### Unicode strings look weird or broken
+
+Yep, that's a known bug; Online Python Tutor currently doesn't have much support for Unicode.
+
+
 #### Whoa, I get an unknown error when I try to use the `re` module (or other modules)
 
 Yep, Online Python Tutor currently has very limited support for external modules. The only module functions that work

From 30710ae180364d333eb7b201f0ffe19b520d5ab4 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 19 Sep 2012 18:59:37 -0700
Subject: [PATCH 400/502] slightly less crappy job of sandboxing by restricting
 file accesses

---
 v3/pg_logger.py | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/v3/pg_logger.py b/v3/pg_logger.py
index 0e470f1d6..b11386a2d 100644
--- a/v3/pg_logger.py
+++ b/v3/pg_logger.py
@@ -56,6 +56,14 @@
 
 
 # simple sandboxing scheme:
+#
+# - use resource.setrlimit to deprive this process of ANY file descriptors
+#   (which will cause file read/write and subprocess shell launches to fail)
+# - restrict user builtins and module imports
+#   (beware that this is NOT foolproof at all ... there are known flaws!)
+#
+# ALWAYS use defense-in-depth and don't just rely on these simple mechanisms
+import resource
 
 
 # ugh, I can't figure out why in Python 2, __builtins__ seems to
@@ -646,6 +654,19 @@ def _runscript(self, script_str):
                         "__user_stdout__" : user_stdout}
 
         try:
+          # enforce resource limits RIGHT BEFORE running script_str
+
+          # set ~200MB virtual memory limit AND a 5-second CPU time
+          # limit (tuned for Webfaction shared hosting) to protect against
+          # memory bombs such as:
+          #   x = 2
+          #   while True: x = x*x
+          resource.setrlimit(resource.RLIMIT_AS, (200000000, 200000000))
+          resource.setrlimit(resource.RLIMIT_CPU, (5, 5))
+
+          # protect against unauthorized filesystem accesses ...
+          resource.setrlimit(resource.RLIMIT_NOFILE, (0, 0)) # no opened files allowed
+          resource.setrlimit(resource.RLIMIT_FSIZE, (0, 0))  # (redundancy for paranoia)
           self.run(script_str, user_globals, user_globals)
         # sys.exit ...
         except SystemExit:

From cb969c75047ed177206171352bf8823f8bb64272 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 19 Sep 2012 19:28:07 -0700
Subject: [PATCH 401/502] precautions moved into pg_logger.py

---
 v3/web_exec.py | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/v3/web_exec.py b/v3/web_exec.py
index 2c7752f73..229cb841b 100644
--- a/v3/web_exec.py
+++ b/v3/web_exec.py
@@ -18,16 +18,6 @@
 import sys
 
 
-# set ~200MB virtual memory limit AND a 5-second CPU time limit
-# (tuned for Webfaction shared hosting) to protect against memory bombs such as:
-#
-#   x = 2
-#   while True: x = x*x
-import resource
-resource.setrlimit(resource.RLIMIT_AS, (200000000, 200000000))
-resource.setrlimit(resource.RLIMIT_CPU, (5, 5))
-
-
 # set to true if you want to log queries in DB_FILE 
 LOG_QUERIES = False
 

From ea003aa18a5e492156ff0bcaf23ee16d7d4fff30 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 19 Sep 2012 19:55:34 -0700
Subject: [PATCH 402/502] minor color change

---
 v3/css/index.css | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/css/index.css b/v3/css/index.css
index d2e7aa29f..f23f6eaf5 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -36,7 +36,7 @@ h1 {
 #optLink {
   font-size: 14pt;
   text-decoration: none;
-  color: black;
+  color: #3D58A2;
   font-weight: bold;
 }
 

From 890e1554e2f127d524a1285df550beeababf814e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 19 Sep 2012 21:40:28 -0700
Subject: [PATCH 403/502] support module imports again

---
 v3/pg_logger.py   | 12 +++++++++++-
 v3/visualize.html | 33 ++++++++++++++++++++-------------
 2 files changed, 31 insertions(+), 14 deletions(-)

diff --git a/v3/pg_logger.py b/v3/pg_logger.py
index b11386a2d..3c3b77dd9 100644
--- a/v3/pg_logger.py
+++ b/v3/pg_logger.py
@@ -79,7 +79,17 @@
 # whitelist of module imports
 ALLOWED_MODULE_IMPORTS = ('math', 'random', 'datetime',
                           'functools', 'operator', 'string',
-                          'collections', 're', 'json')
+                          'collections', 're', 'json',
+                          'heapq', 'bisect')
+
+# PREEMPTIVELY import all of these modules, so that when the user's
+# script imports them, it won't try to do a file read (since they've
+# already been imported and cached in memory). Remember that when
+# the user's code runs, resource.setrlimit(resource.RLIMIT_NOFILE, (0, 0))
+# will already be in effect, so no more files can be opened.
+for m in ALLOWED_MODULE_IMPORTS:
+  __import__(m)
+
 
 # Restrict imports to a whitelist
 def __restricted_import__(*args):
diff --git a/v3/visualize.html b/v3/visualize.html
index ee9201c6f..2b5ce5b94 100644
--- a/v3/visualize.html
+++ b/v3/visualize.html
@@ -173,11 +173,30 @@
 philip@pgbovine.net
 
    
 
+Online Python Tutor supports Python 2.7 and Python 3.2 with limited module
+imports and no file I/O. 
+The following modules may be imported: 
+bisect,
+collections,
+datetime,
+functools,
+heapq,
+json,
+math,
+operator,
+random,
+re,
+string
+
    
+
 
    Have a question? Maybe the FAQ
 or other documentation
-can help.
    
+can help. Its code is open source on GitHub.
    
 
 
    Join the pythontutor-users
@@ -186,18 +205,6 @@
 to receive occasional announcements.
 (Your name and email address will be kept private; only the list owner can see them.)
    
 
-
    
-
-Online Python Tutor supports Python 2.7 and Python 3.2 with limited module
-imports and no file I/O. It is designed for teaching programming, not
-for running or debugging production code. Its code is open source on GitHub.
-
-
    
-
-
 
    
 Copyright © 2010-2012 Philip Guo.  All rights reserved.
 
    

From 39a75b660cc18cb151b632a476698800ad49b5c3 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 20 Sep 2012 13:10:10 -0700
Subject: [PATCH 404/502] fail gracefully when 'resource' module unavailable

---
 v3/pg_logger.py | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/v3/pg_logger.py b/v3/pg_logger.py
index 3c3b77dd9..d3e2d3efd 100644
--- a/v3/pg_logger.py
+++ b/v3/pg_logger.py
@@ -63,7 +63,12 @@
 #   (beware that this is NOT foolproof at all ... there are known flaws!)
 #
 # ALWAYS use defense-in-depth and don't just rely on these simple mechanisms
-import resource
+try:
+  import resource
+  resource_module_loaded = True
+except ImportError:
+  # Google App Engine doesn't seem to have the 'resource' module
+  resource_module_loaded = False
 
 
 # ugh, I can't figure out why in Python 2, __builtins__ seems to
@@ -671,12 +676,14 @@ def _runscript(self, script_str):
           # memory bombs such as:
           #   x = 2
           #   while True: x = x*x
-          resource.setrlimit(resource.RLIMIT_AS, (200000000, 200000000))
-          resource.setrlimit(resource.RLIMIT_CPU, (5, 5))
+          if resource_module_loaded:
+            resource.setrlimit(resource.RLIMIT_AS, (200000000, 200000000))
+            resource.setrlimit(resource.RLIMIT_CPU, (5, 5))
+
+            # protect against unauthorized filesystem accesses ...
+            resource.setrlimit(resource.RLIMIT_NOFILE, (0, 0)) # no opened files allowed
+            resource.setrlimit(resource.RLIMIT_FSIZE, (0, 0))  # (redundancy for paranoia)
 
-          # protect against unauthorized filesystem accesses ...
-          resource.setrlimit(resource.RLIMIT_NOFILE, (0, 0)) # no opened files allowed
-          resource.setrlimit(resource.RLIMIT_FSIZE, (0, 0))  # (redundancy for paranoia)
           self.run(script_str, user_globals, user_globals)
         # sys.exit ...
         except SystemExit:

From e4ebe871e2377c9ad579669142ce2246f556840a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 20 Sep 2012 13:16:14 -0700
Subject: [PATCH 405/502] updated acknowledgment

---
 README | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/README b/README
index 914283cf9..6cfc00bde 100644
--- a/README
+++ b/README
@@ -152,11 +152,16 @@ v3/
   '''
 
 ---
+Acknowledgments
 
-Special thanks to ...
+John DeNero - for helping with the official Python 3 port and lots of code patches
+Chris Horne - https://github.com/lahwran - for security tips
+Peter Wentworth and his students - for working on the original Python 3 fork
+
+
+For advice and feedback from an instructor's perspective:
 
 John Dalbey
-John DeNero
 Michael Ernst
 David Evans
 Paul Gries
@@ -169,6 +174,4 @@ Peter Norvig
 Andrew Petersen
 David Pritchard
 Suzanne Rivoire
-Peter Wentworth
 David Wilkins
-

From b02382345a3918ca4d6f600ef4eae25a48b29fd0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 20 Sep 2012 13:26:36 -0700
Subject: [PATCH 406/502] fixed minor bug thanks to john

---
 v3/pg_logger.py                               |   2 +-
 .../closure-shadow-same-name.golden           | 499 ++++++++++++++++++
 .../closure-shadow-same-name.txt              |   8 +
 3 files changed, 508 insertions(+), 1 deletion(-)
 create mode 100644 v3/tests/backend-tests/closure-shadow-same-name.golden
 create mode 100644 v3/tests/backend-tests/closure-shadow-same-name.txt

diff --git a/v3/pg_logger.py b/v3/pg_logger.py
index d3e2d3efd..202787d13 100644
--- a/v3/pg_logger.py
+++ b/v3/pg_logger.py
@@ -377,7 +377,7 @@ def create_encoded_stack_entry(cur_frame):
                   assert parent_frame.f_locals[k] == v
                   is_in_parent_frame = True
 
-            if is_in_parent_frame:
+            if is_in_parent_frame and k not in cur_frame.f_code.co_varnames:
               continue
 
             # don't display some built-in locals ...
diff --git a/v3/tests/backend-tests/closure-shadow-same-name.golden b/v3/tests/backend-tests/closure-shadow-same-name.golden
new file mode 100644
index 000000000..6bff15ef1
--- /dev/null
+++ b/v3/tests/backend-tests/closure-shadow-same-name.golden
@@ -0,0 +1,499 @@
+{
+  "code": "# some of the params in f and g have identical names\n# so make sure they're all displayed properly\ndef f(x, y, z):\n  def g(x, y):\n    return x\n  return g(x*10, y*10)\n\nf(1, 2, 3)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y, z)", 
+          null
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "z": 3
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "z"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y, z)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "z": 3
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "z"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y, z)", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "z": 3, 
+            "g": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "z", 
+            "g"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y, z)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "g(x, y)", 
+          1
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "g", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "z": 3, 
+            "g": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "z", 
+            "g"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 20, 
+            "x": 10
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "g", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "g_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y, z)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "g(x, y)", 
+          1
+        ]
+      }, 
+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "g", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "z": 3, 
+            "g": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "z", 
+            "g"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 20, 
+            "x": 10
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "g", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "g_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y, z)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "g(x, y)", 
+          1
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "g", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "z": 3, 
+            "g": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "z", 
+            "g"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 20, 
+            "x": 10, 
+            "__return__": 10
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "g", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "g_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y, z)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "g(x, y)", 
+          1
+        ]
+      }, 
+      "line": 5, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "__return__": 10, 
+            "z": 3, 
+            "g": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "z", 
+            "g", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y, z)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "g(x, y)", 
+          1
+        ]
+      }, 
+      "line": 6, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "__return__": 10, 
+            "z": 3, 
+            "g": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "f", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1_p_z", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "z", 
+            "g", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y, z)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "g(x, y)", 
+          1
+        ]
+      }, 
+      "line": 8, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/closure-shadow-same-name.txt b/v3/tests/backend-tests/closure-shadow-same-name.txt
new file mode 100644
index 000000000..da9057531
--- /dev/null
+++ b/v3/tests/backend-tests/closure-shadow-same-name.txt
@@ -0,0 +1,8 @@
+# some of the params in f and g have identical names
+# so make sure they're all displayed properly
+def f(x, y, z):
+  def g(x, y):
+    return x
+  return g(x*10, y*10)
+
+f(1, 2, 3)

From 9126b2c9932991156be1545869459d957697464a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 20 Sep 2012 14:23:29 -0700
Subject: [PATCH 407/502] updated test

---
 .../closure-shadow-same-name.golden           | 32 +++++++++++--------
 .../closure-shadow-same-name.txt              |  4 +--
 2 files changed, 21 insertions(+), 15 deletions(-)

diff --git a/v3/tests/backend-tests/closure-shadow-same-name.golden b/v3/tests/backend-tests/closure-shadow-same-name.golden
index 6bff15ef1..5f17e5c8b 100644
--- a/v3/tests/backend-tests/closure-shadow-same-name.golden
+++ b/v3/tests/backend-tests/closure-shadow-same-name.golden
@@ -1,5 +1,5 @@
 {
-  "code": "# some of the params in f and g have identical names\n# so make sure they're all displayed properly\ndef f(x, y, z):\n  def g(x, y):\n    return x\n  return g(x*10, y*10)\n\nf(1, 2, 3)\n", 
+  "code": "# some of the params in f and g have identical names AND values,\n# so make sure they're all displayed properly\ndef f(x, y, z):\n  def g(x, y):\n    return x\n  return g(x, y)\n\nf(1, 2, 3)\n", 
   "trace": [
     {
       "ordered_globals": [], 
@@ -207,14 +207,16 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "y": 20, 
-            "x": 10
+            "y": 2, 
+            "x": 1
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "g", 
           "is_zombie": false, 
-          "parent_frame_id_list": [], 
+          "parent_frame_id_list": [
+            1
+          ], 
           "unique_hash": "g_f2", 
           "ordered_varnames": [
             "x", 
@@ -277,14 +279,16 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "y": 20, 
-            "x": 10
+            "y": 2, 
+            "x": 1
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "g", 
           "is_zombie": false, 
-          "parent_frame_id_list": [], 
+          "parent_frame_id_list": [
+            1
+          ], 
           "unique_hash": "g_f2", 
           "ordered_varnames": [
             "x", 
@@ -347,15 +351,17 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "y": 20, 
-            "x": 10, 
-            "__return__": 10
+            "y": 2, 
+            "x": 1, 
+            "__return__": 1
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
           "func_name": "g", 
           "is_zombie": false, 
-          "parent_frame_id_list": [], 
+          "parent_frame_id_list": [
+            1
+          ], 
           "unique_hash": "g_f2", 
           "ordered_varnames": [
             "x", 
@@ -397,7 +403,7 @@
           "encoded_locals": {
             "y": 2, 
             "x": 1, 
-            "__return__": 10, 
+            "__return__": 1, 
             "z": 3, 
             "g": [
               "REF", 
@@ -452,7 +458,7 @@
           "encoded_locals": {
             "y": 2, 
             "x": 1, 
-            "__return__": 10, 
+            "__return__": 1, 
             "z": 3, 
             "g": [
               "REF", 
diff --git a/v3/tests/backend-tests/closure-shadow-same-name.txt b/v3/tests/backend-tests/closure-shadow-same-name.txt
index da9057531..13d20e618 100644
--- a/v3/tests/backend-tests/closure-shadow-same-name.txt
+++ b/v3/tests/backend-tests/closure-shadow-same-name.txt
@@ -1,8 +1,8 @@
-# some of the params in f and g have identical names
+# some of the params in f and g have identical names AND values,
 # so make sure they're all displayed properly
 def f(x, y, z):
   def g(x, y):
     return x
-  return g(x*10, y*10)
+  return g(x, y)
 
 f(1, 2, 3)

From ed55ae8cb886da0c4fbf4def352b886797f8478f Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 20 Sep 2012 16:52:17 -0700
Subject: [PATCH 408/502] start integrating some of john's changes

---
 v3/pg_encoder.py                            |  3 +++
 v3/tests/backend-tests/parent-finding-1.txt |  7 +++++++
 v3/tests/backend-tests/parent-finding-2.txt | 10 ++++++++++
 3 files changed, 20 insertions(+)
 create mode 100644 v3/tests/backend-tests/parent-finding-1.txt
 create mode 100644 v3/tests/backend-tests/parent-finding-2.txt

diff --git a/v3/pg_encoder.py b/v3/pg_encoder.py
index 08bfda0b0..a247bee3c 100644
--- a/v3/pg_encoder.py
+++ b/v3/pg_encoder.py
@@ -170,6 +170,9 @@ def encode(self, dat):
         func_name = get_name(dat)
         pretty_name = func_name + '(' + ', '.join(printed_args) + ')'
         new_obj.extend(['FUNCTION', pretty_name, None]) # the final element will be filled in later
+      elif typ is types.BuiltinFunctionType:
+        pretty_name = get_name(dat) + '(...)'
+        new_obj.extend(['FUNCTION', pretty_name, None])
       elif self.is_class(dat) or self.is_instance(dat):
         self.encode_class_or_instance(dat, new_obj)
       elif typ is types.ModuleType:
diff --git a/v3/tests/backend-tests/parent-finding-1.txt b/v3/tests/backend-tests/parent-finding-1.txt
new file mode 100644
index 000000000..0726f0726
--- /dev/null
+++ b/v3/tests/backend-tests/parent-finding-1.txt
@@ -0,0 +1,7 @@
+# make sure OPT finds f as the parent of g
+def f(x, y):
+    def g(x):
+        return x + y
+    return g(3)
+
+f(1, 2)
diff --git a/v3/tests/backend-tests/parent-finding-2.txt b/v3/tests/backend-tests/parent-finding-2.txt
new file mode 100644
index 000000000..c117d4163
--- /dev/null
+++ b/v3/tests/backend-tests/parent-finding-2.txt
@@ -0,0 +1,10 @@
+# make sure OPT finds horse as parent of mask
+def horse(mask):
+    horse = mask
+    def mask(horse):
+        return horse
+    return horse(mask)
+
+mask = lambda horse: horse(2)
+
+horse(mask)

From 26722438d1e01c1a4d5587fc21d5c7e5dd243cdc Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 20 Sep 2012 19:40:49 -0700
Subject: [PATCH 409/502] integrated John's more robust parent-finding scheme -
 TODO: test it

---
 v3/pg_logger.py | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/v3/pg_logger.py b/v3/pg_logger.py
index 202787d13..f8e5052ae 100644
--- a/v3/pg_logger.py
+++ b/v3/pg_logger.py
@@ -13,7 +13,7 @@
 #
 # The above copyright notice and this permission notice shall be included
 # in all copies or substantial portions of the Software.
-# 
+#
 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
@@ -216,8 +216,11 @@ def get_parent_frame(self, frame):
         # variables from its (lexical) parent frame.
         if func_obj.__code__ == frame.f_code:
           all_matched = True
-          for k in parent_frame.f_locals:
-            if k != '__return__' and k in frame.f_locals:
+          for k in frame.f_locals:
+            # Do not try to match local names
+            if k in frame.f_code.co_varnames:
+              continue
+            if k != '__return__' and k in parent_frame.f_locals:
               if parent_frame.f_locals[k] != frame.f_locals[k]:
                 all_matched = False
                 break
@@ -374,8 +377,8 @@ def create_encoded_stack_entry(cur_frame):
                 if k != '__return__':
                   # these values SHOULD BE ALIASES
                   # (don't do an 'is' check since it might not fire for primitives)
-                  assert parent_frame.f_locals[k] == v
-                  is_in_parent_frame = True
+                  if parent_frame.f_locals[k] == v:
+                      is_in_parent_frame = True
 
             if is_in_parent_frame and k not in cur_frame.f_code.co_varnames:
               continue

From e0e7877b79868918d6209d1a29fb9e579ac59c86 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 20 Sep 2012 21:13:41 -0700
Subject: [PATCH 410/502] added

---
 v3/docs/project-ideas.md | 6 ++++++
 1 file changed, 6 insertions(+)
 create mode 100644 v3/docs/project-ideas.md

diff --git a/v3/docs/project-ideas.md b/v3/docs/project-ideas.md
new file mode 100644
index 000000000..6372303fa
--- /dev/null
+++ b/v3/docs/project-ideas.md
@@ -0,0 +1,6 @@
+# Project Ideas
+
+This document provides an overview of some project ideas for extending
+Online Python Tutor (thereafter abbreviated as OPT). View it online at:
+
+

From c41f2cd026db3b99a599f6ebe6145c83deec97b5 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 20 Sep 2012 21:17:47 -0700
Subject: [PATCH 411/502] Update v3/docs/project-ideas.md

---
 v3/docs/project-ideas.md | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/v3/docs/project-ideas.md b/v3/docs/project-ideas.md
index 6372303fa..78cffc766 100644
--- a/v3/docs/project-ideas.md
+++ b/v3/docs/project-ideas.md
@@ -3,4 +3,15 @@
 This document provides an overview of some project ideas for extending
 Online Python Tutor (thereafter abbreviated as OPT). View it online at:
 
+https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/project-ideas.md
 
+These projects are listed roughly in order of difficulty.
+
+Email philip@pgbovine.net if you're interested in working on anything here, or if you have other
+project ideas.
+
+## Enable beautiful print-outs of OPT visualizations (easy)
+
+##
+
+## Migrate OPT backend to Skulpt (very hard)

From 11ab39f726b960f3e8984005dcd6589259478abb Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 20 Sep 2012 21:36:02 -0700
Subject: [PATCH 412/502] Update v3/docs/project-ideas.md

---
 v3/docs/project-ideas.md | 44 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/v3/docs/project-ideas.md b/v3/docs/project-ideas.md
index 78cffc766..168dd2622 100644
--- a/v3/docs/project-ideas.md
+++ b/v3/docs/project-ideas.md
@@ -12,6 +12,50 @@ project ideas.
 
 ## Enable beautiful print-outs of OPT visualizations (easy)
 
+A lot of instructors want to print out their OPT visualizations to make handouts or lecture notes
+for their students.
+However, the default CSS stylesheet is optimized for on-screen viewing and not for printing,
+so when you try to print the diagrams, they look ugly and unreadable.
+
+The project involves creating a custom CSS optimized for printing, especially on black-and-white printers.
+Here is an example how-to guide to get started ...
+http://coding.smashingmagazine.com/2011/11/24/how-to-set-up-a-print-style-sheet/
+
+
+## Add better Unicode support (easy/medium)
+
+Right now, OPT has poor-to-nonexistent Unicode support. Here is one bug report that inspired this project idea:
+
+"""
+I’m having some fun with your nifty Python visualiser.
+While trying too see what happens in Unicode strings are processed,
+I encountered some odd little quirks such as a unicode character
+being replace with a string representation of a Unicode code point
+number in denary.
+
+
+click to visualize code snippet
+
+Changing the first line to
+
+```python
+s = u'\u2015'
+```
+
+Causes an “unknown error” to be reported, as does the insertion of unicode characters like “—” (em dash) in string literals.
+
+The following code causes the interpreter to hang.
+```python
+# -*- coding: utf-8 -*-
+s = u'—'
+```
+"""
+
+(Note that Unicode support in Python 2 and 3 involve different subtleties.)
+
+This project is a great fit for someone familiar with coding in non-English languages.
+
+
 ##
 
 ## Migrate OPT backend to Skulpt (very hard)

From 520bdcbb740e29cd09ff8b0d39fcda906f82e71b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 20 Sep 2012 21:54:42 -0700
Subject: [PATCH 413/502] Update v3/docs/project-ideas.md

---
 v3/docs/project-ideas.md | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/v3/docs/project-ideas.md b/v3/docs/project-ideas.md
index 168dd2622..1bf0b98ed 100644
--- a/v3/docs/project-ideas.md
+++ b/v3/docs/project-ideas.md
@@ -10,21 +10,27 @@ These projects are listed roughly in order of difficulty.
 Email philip@pgbovine.net if you're interested in working on anything here, or if you have other
 project ideas.
 
+
 ## Enable beautiful print-outs of OPT visualizations (easy)
 
 A lot of instructors want to print out their OPT visualizations to make handouts or lecture notes
-for their students.
+for students.
 However, the default CSS stylesheet is optimized for on-screen viewing and not for printing,
 so when you try to print the diagrams, they look ugly and unreadable.
 
 The project involves creating a custom CSS optimized for printing, especially on black-and-white printers.
-Here is an example how-to guide to get started ...
+Here is an example how-to guide to get started creating a CSS print style sheet ...
 http://coding.smashingmagazine.com/2011/11/24/how-to-set-up-a-print-style-sheet/
 
 
-## Add better Unicode support (easy/medium)
+## Add better Unicode support (medium)
+
+This project is a great fit for someone familiar with coding in non-English languages.
+
+Right now, OPT has poor-to-nonexistent Unicode support, so adding it is important for making it friendlier to
+non-English audiences.
 
-Right now, OPT has poor-to-nonexistent Unicode support. Here is one bug report that inspired this project idea:
+Here is one bug report that inspired this project idea:
 
 """
 I’m having some fun with your nifty Python visualiser.
@@ -53,9 +59,5 @@ s = u'—'
 
 (Note that Unicode support in Python 2 and 3 involve different subtleties.)
 
-This project is a great fit for someone familiar with coding in non-English languages.
-
-
-##
 
 ## Migrate OPT backend to Skulpt (very hard)

From 9bf583e84004fb359901a2ac03f7282f495e924b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 20 Sep 2012 22:50:01 -0700
Subject: [PATCH 414/502] Update v3/docs/project-ideas.md

---
 v3/docs/project-ideas.md | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/v3/docs/project-ideas.md b/v3/docs/project-ideas.md
index 1bf0b98ed..e9b24d374 100644
--- a/v3/docs/project-ideas.md
+++ b/v3/docs/project-ideas.md
@@ -60,4 +60,34 @@ s = u'—'
 (Note that Unicode support in Python 2 and 3 involve different subtleties.)
 
 
-## Migrate OPT backend to Skulpt (very hard)
+## Create an OPT backend for a different programming language (hard)
+
+This project is great for someone who likes to hack on language implementations and runtimes.
+
+The OPT frontend can visualize programs written in any mainstream language, not just Python.
+This project involves creating a backend for another language (e.g., Ruby, Java, JavaScript, C++, Scheme,
+whatever you want!). All the backend needs to do is to generate an execution trace
+in the following format ...
+
+https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/opt-trace-format.md
+
+... and the frontend should be able to visualize it!
+
+
+## Migrate OPT backend to Skulpt (very hard but super cool!)
+
+Right now the OPT backend runs on the server, but it would be super-cool to create a "backend"
+that runs purely in the browser. Skulpt - http://www.skulpt.org/ - is the leading contender here,
+since I am in touch with its main developers.
+
+Main Advantages:
+  - supports fine-grained tracing of expression and sub-expression evaluation (right now OPT can only single-step over one line at a time since it relies on the Python bdb debugger)
+  - enables the creation of an interactive REPL that incrementally takes in user inputs, rather than just executing batch programs. leads to better interactivity and responsiveness.
+  - supports on-demand evaluation and in-memory storage of (relatively) large and persistent data structures such as a 100,000-element dictionary, since there is no need to send a giant trace from the server.
+  - works in offline mode for students without reliable Internet access
+
+
+Tips & Tricks:
+  - http://blog.bonelakesoftware.com/2011/03/adding-module-to-skulpt.html
+  - http://blog.bonelakesoftware.com/2011/02/python-in-your-browser-in-javascript.html
+  - From Scott Graham, when I asked him whether Skulpt implements Python 2 or 3: “Mostly 2-ish. Some object hierarchy things take after 3's simplified semantics.”

From 51870eca81c2e17a57d88516311dca4bd27823ed Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 20 Sep 2012 23:01:54 -0700
Subject: [PATCH 415/502] Update v3/docs/project-ideas.md

---
 v3/docs/project-ideas.md | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/v3/docs/project-ideas.md b/v3/docs/project-ideas.md
index e9b24d374..c7fdb4bb5 100644
--- a/v3/docs/project-ideas.md
+++ b/v3/docs/project-ideas.md
@@ -76,18 +76,19 @@ https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/opt-trace-form
 
 ## Migrate OPT backend to Skulpt (very hard but super cool!)
 
-Right now the OPT backend runs on the server, but it would be super-cool to create a "backend"
-that runs purely in the browser. Skulpt - http://www.skulpt.org/ - is the leading contender here,
+This project is appropriate for someone with advanced knowledge of hacking a Python interpreter.
+
+Right now the OPT backend runs Python code on the server, but it would be super-cool to create a "backend"
+that runs entirely in the browser. Modifying Skulpt -- http://www.skulpt.org/ -- is the leading contender here,
 since I am in touch with its main developers.
 
 Main Advantages:
-  - supports fine-grained tracing of expression and sub-expression evaluation (right now OPT can only single-step over one line at a time since it relies on the Python bdb debugger)
-  - enables the creation of an interactive REPL that incrementally takes in user inputs, rather than just executing batch programs. leads to better interactivity and responsiveness.
-  - supports on-demand evaluation and in-memory storage of (relatively) large and persistent data structures such as a 100,000-element dictionary, since there is no need to send a giant trace from the server.
-  - works in offline mode for students without reliable Internet access
+  - Enables fine-grained tracing of expression and sub-expression evaluation, which has clear pedagogical benefits; right now OPT can only single-step over one line at a time since it relies on the Python bdb debugger.
+  - Enables an interactive REPL that incrementally takes in user inputs rather than just executing batch programs; this can lead to better interactivity and responsiveness.
+  - Supports on-demand evaluation and in-memory storage of (relatively) large data structures such as a 100,000-element dictionary for a spell checker program; right now OPT must send that giant dictionary in a trace (encoded in an inefficient format).
+  - Works in "offline mode" for students in regions without reliable Internet access
 
 
 Tips & Tricks:
-  - http://blog.bonelakesoftware.com/2011/03/adding-module-to-skulpt.html
-  - http://blog.bonelakesoftware.com/2011/02/python-in-your-browser-in-javascript.html
+  - From Brad Miller: http://blog.bonelakesoftware.com/2011/03/adding-module-to-skulpt.html and http://blog.bonelakesoftware.com/2011/02/python-in-your-browser-in-javascript.html
   - From Scott Graham, when I asked him whether Skulpt implements Python 2 or 3: “Mostly 2-ish. Some object hierarchy things take after 3's simplified semantics.”

From 56e56a8a5d8914916729eeae2bcf508fe3b757b0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 21 Sep 2012 10:37:16 -0700
Subject: [PATCH 416/502] updated

---
 .../backend-tests/parent-finding-1.golden     | 483 +++++++++
 .../backend-tests/parent-finding-2.golden     | 957 ++++++++++++++++++
 2 files changed, 1440 insertions(+)
 create mode 100644 v3/tests/backend-tests/parent-finding-1.golden
 create mode 100644 v3/tests/backend-tests/parent-finding-2.golden

diff --git a/v3/tests/backend-tests/parent-finding-1.golden b/v3/tests/backend-tests/parent-finding-1.golden
new file mode 100644
index 000000000..00a4aab28
--- /dev/null
+++ b/v3/tests/backend-tests/parent-finding-1.golden
@@ -0,0 +1,483 @@
+{
+  "code": "# make sure OPT finds f as the parent of g\ndef f(x, y):\n    def g(x):\n        return x + y\n    return g(3)\n\nf(1, 2)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y)", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "x", 
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "x", 
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "g": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "g"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "g(x)", 
+          1
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "g", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "g": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "g"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 3
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "g", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "g_f2", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "g(x)", 
+          1
+        ]
+      }, 
+      "line": 3, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "g", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "g": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "g"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 3
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "g", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "g_f2", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "g(x)", 
+          1
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "g", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "g": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "g"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": 5, 
+            "x": 3
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "g", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "g_f2", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "g(x)", 
+          1
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "__return__": 5, 
+            "g": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "g", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "g(x)", 
+          1
+        ]
+      }, 
+      "line": 5, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "__return__": 5, 
+            "g": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "f", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1_p_z", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "g", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "g(x)", 
+          1
+        ]
+      }, 
+      "line": 7, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/parent-finding-2.golden b/v3/tests/backend-tests/parent-finding-2.golden
new file mode 100644
index 000000000..812420ec4
--- /dev/null
+++ b/v3/tests/backend-tests/parent-finding-2.golden
@@ -0,0 +1,957 @@
+{
+  "code": "# make sure OPT finds horse as parent of mask\ndef horse(mask):\n    horse = mask\n    def mask(horse):\n        return horse\n    return horse(mask)\n\nmask = lambda horse: horse(2)\n\nhorse(mask)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "horse"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "horse": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "horse(mask)", 
+          null
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "horse", 
+        "mask"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "horse": [
+          "REF", 
+          1
+        ], 
+        "mask": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "horse(mask)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(horse)", 
+          null
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "horse", 
+        "mask"
+      ], 
+      "stdout": "", 
+      "func_name": "horse", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "mask": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "horse", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "horse_f1", 
+          "ordered_varnames": [
+            "mask"
+          ]
+        }
+      ], 
+      "globals": {
+        "horse": [
+          "REF", 
+          1
+        ], 
+        "mask": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "horse(mask)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(horse)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "horse", 
+        "mask"
+      ], 
+      "stdout": "", 
+      "func_name": "horse", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "mask": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "horse", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "horse_f1", 
+          "ordered_varnames": [
+            "mask"
+          ]
+        }
+      ], 
+      "globals": {
+        "horse": [
+          "REF", 
+          1
+        ], 
+        "mask": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "horse(mask)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(horse)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "horse", 
+        "mask"
+      ], 
+      "stdout": "", 
+      "func_name": "horse", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "horse": [
+              "REF", 
+              2
+            ], 
+            "mask": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "horse", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "horse_f1", 
+          "ordered_varnames": [
+            "mask", 
+            "horse"
+          ]
+        }
+      ], 
+      "globals": {
+        "horse": [
+          "REF", 
+          1
+        ], 
+        "mask": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "horse(mask)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(horse)", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "horse", 
+        "mask"
+      ], 
+      "stdout": "", 
+      "func_name": "horse", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "horse": [
+              "REF", 
+              2
+            ], 
+            "mask": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "horse", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "horse_f1_p", 
+          "ordered_varnames": [
+            "mask", 
+            "horse"
+          ]
+        }
+      ], 
+      "globals": {
+        "horse": [
+          "REF", 
+          1
+        ], 
+        "mask": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "horse(mask)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(horse)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "mask(horse)", 
+          1
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "horse", 
+        "mask"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "horse": [
+              "REF", 
+              2
+            ], 
+            "mask": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "horse", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "horse_f1_p", 
+          "ordered_varnames": [
+            "mask", 
+            "horse"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "horse": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2", 
+          "ordered_varnames": [
+            "horse"
+          ]
+        }
+      ], 
+      "globals": {
+        "horse": [
+          "REF", 
+          1
+        ], 
+        "mask": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "horse(mask)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(horse)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "mask(horse)", 
+          1
+        ]
+      }, 
+      "line": 8, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "horse", 
+        "mask"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "horse": [
+              "REF", 
+              2
+            ], 
+            "mask": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "horse", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "horse_f1_p", 
+          "ordered_varnames": [
+            "mask", 
+            "horse"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "horse": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2", 
+          "ordered_varnames": [
+            "horse"
+          ]
+        }
+      ], 
+      "globals": {
+        "horse": [
+          "REF", 
+          1
+        ], 
+        "mask": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "horse(mask)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(horse)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "mask(horse)", 
+          1
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "horse", 
+        "mask"
+      ], 
+      "stdout": "", 
+      "func_name": "mask", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "horse": [
+              "REF", 
+              2
+            ], 
+            "mask": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "horse", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "horse_f1_p", 
+          "ordered_varnames": [
+            "mask", 
+            "horse"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "horse": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2", 
+          "ordered_varnames": [
+            "horse"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "horse": 2
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "mask", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "mask_f3", 
+          "ordered_varnames": [
+            "horse"
+          ]
+        }
+      ], 
+      "globals": {
+        "horse": [
+          "REF", 
+          1
+        ], 
+        "mask": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "horse(mask)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(horse)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "mask(horse)", 
+          1
+        ]
+      }, 
+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "horse", 
+        "mask"
+      ], 
+      "stdout": "", 
+      "func_name": "mask", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "horse": [
+              "REF", 
+              2
+            ], 
+            "mask": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "horse", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "horse_f1_p", 
+          "ordered_varnames": [
+            "mask", 
+            "horse"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "horse": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2", 
+          "ordered_varnames": [
+            "horse"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "horse": 2
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "mask", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "mask_f3", 
+          "ordered_varnames": [
+            "horse"
+          ]
+        }
+      ], 
+      "globals": {
+        "horse": [
+          "REF", 
+          1
+        ], 
+        "mask": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "horse(mask)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(horse)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "mask(horse)", 
+          1
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "horse", 
+        "mask"
+      ], 
+      "stdout": "", 
+      "func_name": "mask", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "horse": [
+              "REF", 
+              2
+            ], 
+            "mask": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "horse", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "horse_f1_p", 
+          "ordered_varnames": [
+            "mask", 
+            "horse"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "horse": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2", 
+          "ordered_varnames": [
+            "horse"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "__return__": 2, 
+            "horse": 2
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "mask", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "mask_f3", 
+          "ordered_varnames": [
+            "horse", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "horse": [
+          "REF", 
+          1
+        ], 
+        "mask": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "horse(mask)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(horse)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "mask(horse)", 
+          1
+        ]
+      }, 
+      "line": 5, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "horse", 
+        "mask"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "horse": [
+              "REF", 
+              2
+            ], 
+            "mask": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "horse", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "horse_f1_p", 
+          "ordered_varnames": [
+            "mask", 
+            "horse"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": 2, 
+            "horse": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2", 
+          "ordered_varnames": [
+            "horse", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "horse": [
+          "REF", 
+          1
+        ], 
+        "mask": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "horse(mask)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(horse)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "mask(horse)", 
+          1
+        ]
+      }, 
+      "line": 8, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "horse", 
+        "mask"
+      ], 
+      "stdout": "", 
+      "func_name": "horse", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": 2, 
+            "horse": [
+              "REF", 
+              2
+            ], 
+            "mask": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "horse", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "horse_f1_p", 
+          "ordered_varnames": [
+            "mask", 
+            "horse", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "horse": [
+          "REF", 
+          1
+        ], 
+        "mask": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "horse(mask)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(horse)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "mask(horse)", 
+          1
+        ]
+      }, 
+      "line": 6, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "horse", 
+        "mask"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": 2, 
+            "horse": [
+              "REF", 
+              2
+            ], 
+            "mask": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "horse", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "horse_f1_p_z", 
+          "ordered_varnames": [
+            "mask", 
+            "horse", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "horse": [
+          "REF", 
+          1
+        ], 
+        "mask": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "horse(mask)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(horse)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "mask(horse)", 
+          1
+        ]
+      }, 
+      "line": 10, 
+      "event": "return"
+    }
+  ]
+}

From d66b7d390b0ef082d890d3ba019805cd92b43d15 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 21 Sep 2012 11:02:27 -0700
Subject: [PATCH 417/502] Update v3/docs/project-ideas.md

---
 v3/docs/project-ideas.md | 30 ++++++++++++++++++++++++++----
 1 file changed, 26 insertions(+), 4 deletions(-)

diff --git a/v3/docs/project-ideas.md b/v3/docs/project-ideas.md
index c7fdb4bb5..3550606ba 100644
--- a/v3/docs/project-ideas.md
+++ b/v3/docs/project-ideas.md
@@ -15,7 +15,7 @@ project ideas.
 
 A lot of instructors want to print out their OPT visualizations to make handouts or lecture notes
 for students.
-However, the default CSS stylesheet is optimized for on-screen viewing and not for printing,
+However, the default CSS is optimized for on-screen viewing and not for printing,
 so when you try to print the diagrams, they look ugly and unreadable.
 
 The project involves creating a custom CSS optimized for printing, especially on black-and-white printers.
@@ -23,6 +23,29 @@ Here is an example how-to guide to get started creating a CSS print style sheet
 http://coding.smashingmagazine.com/2011/11/24/how-to-set-up-a-print-style-sheet/
 
 
+## Responsive UI for different resolution displays (easy/medium)
+
+This project is good for someone interested in visual design.
+
+Implement the principles of [responsive web design](http://en.wikipedia.org/wiki/Responsive_Web_Design)
+so that OPT visualizations (and the surrounding user interface) look good on displays of many different sizes
+ranging from smartphones to tablets to laptops to giant desktop monitors.
+
+
+## Optimize display of object-oriented programs (medium)
+
+This is a good project for an object-oriented programming enthusiast.
+
+Right now OPT naively visualizes all the steps that the Python interpreter takes when executing an
+object-oriented program, which leads to all sorts of extraneous variables, frames, and pointers
+lying around.
+
+Click here for an example.
+
+This project involves cleaning up the execution trace so that object-oriented programs look
+sensible when visualized.
+
+
 ## Add better Unicode support (medium)
 
 This project is a great fit for someone familiar with coding in non-English languages.
@@ -65,9 +88,8 @@ s = u'—'
 This project is great for someone who likes to hack on language implementations and runtimes.
 
 The OPT frontend can visualize programs written in any mainstream language, not just Python.
-This project involves creating a backend for another language (e.g., Ruby, Java, JavaScript, C++, Scheme,
-whatever you want!). All the backend needs to do is to generate an execution trace
-in the following format ...
+This project involves creating a backend for another language (e.g., Ruby, Java, JavaScript, C, C++, Scheme).
+All the backend needs to do is to generate an execution trace in the following format ...
 
 https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/opt-trace-format.md
 

From 77538d55ab050905d300811d6698190bd5a97504 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 21 Sep 2012 11:08:43 -0700
Subject: [PATCH 418/502] Update v3/docs/project-ideas.md

---
 v3/docs/project-ideas.md | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/v3/docs/project-ideas.md b/v3/docs/project-ideas.md
index 3550606ba..d81af9039 100644
--- a/v3/docs/project-ideas.md
+++ b/v3/docs/project-ideas.md
@@ -11,7 +11,7 @@ Email philip@pgbovine.net if you're interested in working on anything here, or i
 project ideas.
 
 
-## Enable beautiful print-outs of OPT visualizations (easy)
+## Enable beautiful printouts of OPT visualizations (easy)
 
 A lot of instructors want to print out their OPT visualizations to make handouts or lecture notes
 for students.
@@ -23,9 +23,9 @@ Here is an example how-to guide to get started creating a CSS print style sheet
 http://coding.smashingmagazine.com/2011/11/24/how-to-set-up-a-print-style-sheet/
 
 
-## Responsive UI for different resolution displays (easy/medium)
+## Implement responsive web UI design for OPT frontend (easy/medium)
 
-This project is good for someone interested in visual design.
+This is a good project for someone interested in visual and web design.
 
 Implement the principles of [responsive web design](http://en.wikipedia.org/wiki/Responsive_Web_Design)
 so that OPT visualizations (and the surrounding user interface) look good on displays of many different sizes
@@ -98,7 +98,8 @@ https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/opt-trace-form
 
 ## Migrate OPT backend to Skulpt (very hard but super cool!)
 
-This project is appropriate for someone with advanced knowledge of hacking a Python interpreter.
+This project is appropriate for someone with advanced knowledge of hacking a Python interpreter
+who is willing to make a substantive time commitment.
 
 Right now the OPT backend runs Python code on the server, but it would be super-cool to create a "backend"
 that runs entirely in the browser. Modifying Skulpt -- http://www.skulpt.org/ -- is the leading contender here,

From f1564995722a2d15a42f4e159a729b10bf999b6a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 21 Sep 2012 11:09:01 -0700
Subject: [PATCH 419/502] added advertising of project pages

---
 v3/index.html | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/v3/index.html b/v3/index.html
index 2a1431b28..35462a9f9 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -102,7 +102,7 @@ 
    LEARN programming by vi
 
 
    
 But this is just the beginning. We are actively seeking partnerships with
-educators at all grade levels to deploy and improve this tool.  Email
+educators at all grade levels to deploy and improve this tool.  Email
 philip@pgbovine.net if you are interested in collaborating.
 
    
 
@@ -201,7 +201,7 @@ 
    SHARE visualizations on
   
  • Free, open-source BSD-licensed code on GitHub
 
-  
  • Want to help out? We have ideas for student thesis projects or
+  
  • Want to help out? We have ideas for student thesis projects or
   for anyone else who loves to hack. Email philip@pgbovine.net for
   more info.
  

From e42afb67e1aa55664e7b698617ace1bd52796c22 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 21 Sep 2012 11:37:55 -0700
Subject: [PATCH 420/502] make regression tests more standardized

---
 v3/example-code/list-comp.golden              | 108 ++-
 v3/example-code/map.golden                    |  60 +-
 v3/example-code/nonlocal.golden               |  11 +
 v3/example-code/oop_inherit.golden            |  12 +-
 v3/example-code/py_tutorial.golden            | 116 ++--
 v3/example-code/sqrt.golden                   | 488 +++++++-------
 v3/generate_json_trace.py                     |   8 +
 .../infinite_loop_one_liner.golden            | 618 +++++++++---------
 .../backend-tests/infinite_loop_one_liner.txt |   3 +-
 v3/tests/backend-tests/pie-test.golden        |  10 +-
 10 files changed, 769 insertions(+), 665 deletions(-)
 create mode 100644 v3/example-code/nonlocal.golden

diff --git a/v3/example-code/list-comp.golden b/v3/example-code/list-comp.golden
index 6a4ea270a..deb6d8b80 100644
--- a/v3/example-code/list-comp.golden
+++ b/v3/example-code/list-comp.golden
@@ -39,12 +39,17 @@
     {
       "ordered_globals": [
         "ppl", 
+        "_[1]", 
         "e"
       ], 
       "stdout": "", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
+        "_[1]": [
+          "REF", 
+          2
+        ], 
         "e": "Alice", 
         "ppl": [
           "REF", 
@@ -58,6 +63,10 @@
           "Bob", 
           "Carol", 
           "Doug"
+        ], 
+        "2": [
+          "LIST", 
+          "Alice!!"
         ]
       }, 
       "line": 2, 
@@ -66,12 +75,17 @@
     {
       "ordered_globals": [
         "ppl", 
+        "_[1]", 
         "e"
       ], 
       "stdout": "", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
+        "_[1]": [
+          "REF", 
+          2
+        ], 
         "e": "Bob", 
         "ppl": [
           "REF", 
@@ -85,6 +99,11 @@
           "Bob", 
           "Carol", 
           "Doug"
+        ], 
+        "2": [
+          "LIST", 
+          "Alice!!", 
+          "Bob!!"
         ]
       }, 
       "line": 2, 
@@ -93,12 +112,17 @@
     {
       "ordered_globals": [
         "ppl", 
+        "_[1]", 
         "e"
       ], 
       "stdout": "", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
+        "_[1]": [
+          "REF", 
+          2
+        ], 
         "e": "Carol", 
         "ppl": [
           "REF", 
@@ -112,6 +136,12 @@
           "Bob", 
           "Carol", 
           "Doug"
+        ], 
+        "2": [
+          "LIST", 
+          "Alice!!", 
+          "Bob!!", 
+          "Carol!!"
         ]
       }, 
       "line": 2, 
@@ -120,12 +150,17 @@
     {
       "ordered_globals": [
         "ppl", 
+        "_[1]", 
         "e"
       ], 
       "stdout": "", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
+        "_[1]": [
+          "REF", 
+          2
+        ], 
         "e": "Doug", 
         "ppl": [
           "REF", 
@@ -139,6 +174,13 @@
           "Bob", 
           "Carol", 
           "Doug"
+        ], 
+        "2": [
+          "LIST", 
+          "Alice!!", 
+          "Bob!!", 
+          "Carol!!", 
+          "Doug!!"
         ]
       }, 
       "line": 2, 
@@ -188,22 +230,27 @@
         "ppl", 
         "e", 
         "excited_ppl", 
-        "x"
+        "x", 
+        "_[2]"
       ], 
       "stdout": "", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
-        "e": "Doug", 
+        "x": "Alice", 
         "ppl": [
           "REF", 
           1
         ], 
+        "e": "Doug", 
         "excited_ppl": [
           "REF", 
           2
         ], 
-        "x": "Alice"
+        "_[2]": [
+          "REF", 
+          3
+        ]
       }, 
       "heap": {
         "1": [
@@ -219,6 +266,10 @@
           "Bob!!", 
           "Carol!!", 
           "Doug!!"
+        ], 
+        "3": [
+          "LIST", 
+          5
         ]
       }, 
       "line": 3, 
@@ -229,22 +280,27 @@
         "ppl", 
         "e", 
         "excited_ppl", 
-        "x"
+        "x", 
+        "_[2]"
       ], 
       "stdout": "", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
-        "e": "Doug", 
+        "x": "Bob", 
         "ppl": [
           "REF", 
           1
         ], 
+        "e": "Doug", 
         "excited_ppl": [
           "REF", 
           2
         ], 
-        "x": "Bob"
+        "_[2]": [
+          "REF", 
+          3
+        ]
       }, 
       "heap": {
         "1": [
@@ -260,6 +316,11 @@
           "Bob!!", 
           "Carol!!", 
           "Doug!!"
+        ], 
+        "3": [
+          "LIST", 
+          5, 
+          3
         ]
       }, 
       "line": 3, 
@@ -270,22 +331,27 @@
         "ppl", 
         "e", 
         "excited_ppl", 
-        "x"
+        "x", 
+        "_[2]"
       ], 
       "stdout": "", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
-        "e": "Doug", 
+        "x": "Carol", 
         "ppl": [
           "REF", 
           1
         ], 
+        "e": "Doug", 
         "excited_ppl": [
           "REF", 
           2
         ], 
-        "x": "Carol"
+        "_[2]": [
+          "REF", 
+          3
+        ]
       }, 
       "heap": {
         "1": [
@@ -301,6 +367,12 @@
           "Bob!!", 
           "Carol!!", 
           "Doug!!"
+        ], 
+        "3": [
+          "LIST", 
+          5, 
+          3, 
+          5
         ]
       }, 
       "line": 3, 
@@ -311,22 +383,27 @@
         "ppl", 
         "e", 
         "excited_ppl", 
-        "x"
+        "x", 
+        "_[2]"
       ], 
       "stdout": "", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
-        "e": "Doug", 
+        "x": "Doug", 
         "ppl": [
           "REF", 
           1
         ], 
+        "e": "Doug", 
         "excited_ppl": [
           "REF", 
           2
         ], 
-        "x": "Doug"
+        "_[2]": [
+          "REF", 
+          3
+        ]
       }, 
       "heap": {
         "1": [
@@ -342,6 +419,13 @@
           "Bob!!", 
           "Carol!!", 
           "Doug!!"
+        ], 
+        "3": [
+          "LIST", 
+          5, 
+          3, 
+          5, 
+          4
         ]
       }, 
       "line": 3, 
diff --git a/v3/example-code/map.golden b/v3/example-code/map.golden
index e0181c7ec..30214b328 100644
--- a/v3/example-code/map.golden
+++ b/v3/example-code/map.golden
@@ -795,7 +795,7 @@
         {
           "frame_id": 3, 
           "encoded_locals": {
-            "__return__": 1.0, 
+            "__return__": 1.000, 
             "x": 2
           }, 
           "is_highlighted": true, 
@@ -1579,7 +1579,7 @@
         {
           "frame_id": 5, 
           "encoded_locals": {
-            "__return__": 2.0, 
+            "__return__": 2.000, 
             "x": 4
           }, 
           "is_highlighted": true, 
@@ -2538,7 +2538,7 @@
         {
           "frame_id": 7, 
           "encoded_locals": {
-            "__return__": 3.0, 
+            "__return__": 3.000, 
             "x": 6
           }, 
           "is_highlighted": true, 
@@ -3666,7 +3666,7 @@
         {
           "frame_id": 9, 
           "encoded_locals": {
-            "__return__": 4.0, 
+            "__return__": 4.000, 
             "x": 8
           }, 
           "is_highlighted": true, 
@@ -4957,7 +4957,7 @@
         {
           "frame_id": 11, 
           "encoded_locals": {
-            "__return__": 5.0, 
+            "__return__": 5.000, 
             "x": 10
           }, 
           "is_highlighted": true, 
@@ -6188,7 +6188,7 @@
         ], 
         "11": [
           "LIST", 
-          5.0
+          5.000
         ]
       }, 
       "line": 9, 
@@ -6377,8 +6377,8 @@
         ], 
         "12": [
           "LIST", 
-          4.0, 
-          5.0
+          4.000, 
+          5.000
         ]
       }, 
       "line": 9, 
@@ -6539,9 +6539,9 @@
         ], 
         "13": [
           "LIST", 
-          3.0, 
-          4.0, 
-          5.0
+          3.000, 
+          4.000, 
+          5.000
         ]
       }, 
       "line": 9, 
@@ -6673,10 +6673,10 @@
         ], 
         "14": [
           "LIST", 
-          2.0, 
-          3.0, 
-          4.0, 
-          5.0
+          2.000, 
+          3.000, 
+          4.000, 
+          5.000
         ]
       }, 
       "line": 9, 
@@ -6778,11 +6778,11 @@
         ], 
         "15": [
           "LIST", 
-          1.0, 
-          2.0, 
-          3.0, 
-          4.0, 
-          5.0
+          1.000, 
+          2.000, 
+          3.000, 
+          4.000, 
+          5.000
         ]
       }, 
       "line": 9, 
@@ -6856,11 +6856,11 @@
         ], 
         "15": [
           "LIST", 
-          1.0, 
-          2.0, 
-          3.0, 
-          4.0, 
-          5.0
+          1.000, 
+          2.000, 
+          3.000, 
+          4.000, 
+          5.000
         ]
       }, 
       "line": 12, 
@@ -6939,11 +6939,11 @@
         ], 
         "15": [
           "LIST", 
-          1.0, 
-          2.0, 
-          3.0, 
-          4.0, 
-          5.0
+          1.000, 
+          2.000, 
+          3.000, 
+          4.000, 
+          5.000
         ]
       }, 
       "line": 15, 
diff --git a/v3/example-code/nonlocal.golden b/v3/example-code/nonlocal.golden
new file mode 100644
index 000000000..7d3399bec
--- /dev/null
+++ b/v3/example-code/nonlocal.golden
@@ -0,0 +1,11 @@
+{
+  "code": "# 'nonlocal' keyword is only in Python 3\ndef outer():\n    x = 1\n    def inner():\n        nonlocal x\n        x = 2\n        y = x\n        print(\"inner:\", x, y)\n    inner()\n    print(\"outer:\", x)\n\nouter()\n", 
+  "trace": [
+    {
+      "exception_msg": "Error: invalid syntax", 
+      "line": 5, 
+      "event": "uncaught_exception", 
+      "offset": 18
+    }
+  ]
+}
diff --git a/v3/example-code/oop_inherit.golden b/v3/example-code/oop_inherit.golden
index 8b3640434..02a79ebed 100644
--- a/v3/example-code/oop_inherit.golden
+++ b/v3/example-code/oop_inherit.golden
@@ -2058,7 +2058,7 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "percentage": 1.26, 
+            "percentage": 1.260, 
             "self": [
               "REF", 
               8
@@ -2310,7 +2310,7 @@
         {
           "frame_id": 4, 
           "encoded_locals": {
-            "percentage": 1.26, 
+            "percentage": 1.260, 
             "self": [
               "REF", 
               8
@@ -2563,7 +2563,7 @@
           "frame_id": 4, 
           "encoded_locals": {
             "__return__": null, 
-            "percentage": 1.26, 
+            "percentage": 1.260, 
             "self": [
               "REF", 
               8
@@ -2719,7 +2719,7 @@
           ], 
           [
             "salary", 
-            226000.0
+            226000.000
           ]
         ]
       }, 
@@ -2955,7 +2955,7 @@
           ], 
           [
             "salary", 
-            226000.0
+            226000.000
           ]
         ]
       }, 
@@ -3170,7 +3170,7 @@
           ], 
           [
             "salary", 
-            226000.0
+            226000.000
           ]
         ]
       }, 
diff --git a/v3/example-code/py_tutorial.golden b/v3/example-code/py_tutorial.golden
index 8786b892b..a3b9a2ffe 100644
--- a/v3/example-code/py_tutorial.golden
+++ b/v3/example-code/py_tutorial.golden
@@ -35,7 +35,7 @@
       "stack_to_render": [], 
       "globals": {
         "age": 26, 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {}, 
       "line": 8, 
@@ -52,7 +52,7 @@
       "stack_to_render": [], 
       "globals": {
         "age": 26, 
-        "pi": 3.1416, 
+        "pi": 3.142, 
         "s": "Rutherford Birchard Hayes"
       }, 
       "heap": {}, 
@@ -75,7 +75,7 @@
           1
         ], 
         "age": 26, 
-        "pi": 3.1416, 
+        "pi": 3.142, 
         "s": "Rutherford Birchard Hayes"
       }, 
       "heap": {
@@ -106,7 +106,7 @@
           1
         ], 
         "age": 26, 
-        "pi": 3.1416, 
+        "pi": 3.142, 
         "s": "Rutherford Birchard Hayes", 
         "firstName": "Rutherford"
       }, 
@@ -142,7 +142,7 @@
           1
         ], 
         "s": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -178,7 +178,7 @@
           1
         ], 
         "s": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -216,7 +216,7 @@
         ], 
         "s": "Rutherford Birchard Hayes", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -254,7 +254,7 @@
         ], 
         "s": "Rutherford Birchard Hayes", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -292,7 +292,7 @@
         ], 
         "s": "Rutherford Birchard Hayes", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -335,7 +335,7 @@
         ], 
         "s": "Rutherford Birchard Hayes", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -384,7 +384,7 @@
         ], 
         "s": "Rutherford Birchard Hayes", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -436,7 +436,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "John", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -488,7 +488,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "John", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -540,7 +540,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "Paul", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -592,7 +592,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "Paul", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -644,7 +644,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "George", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -696,7 +696,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "George", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -748,7 +748,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -800,7 +800,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -852,7 +852,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -909,7 +909,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -983,7 +983,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
+        "pi": 3.142
       }, 
       "heap": {
         "1": [
@@ -1067,7 +1067,7 @@
         "s": "Rutherford Birchard Hayes", 
         "b": "Ringo", 
         "s2": "Rutherford Birchard Hayes", 
-        "pi": 3.1416
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@@ -1151,7 +1151,7 @@
         "s": "Rutherford Birchard Hayes", 
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+        "pi": 3.142
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@@ -1236,7 +1236,7 @@
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@@ -1321,7 +1321,7 @@
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@@ -1406,7 +1406,7 @@
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@@ -1491,7 +1491,7 @@
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@@ -1576,7 +1576,7 @@
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@@ -1661,7 +1661,7 @@
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@@ -1746,7 +1746,7 @@
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@@ -1831,7 +1831,7 @@
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@@ -1916,7 +1916,7 @@
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@@ -2001,7 +2001,7 @@
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@@ -2086,7 +2086,7 @@
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@@ -2171,7 +2171,7 @@
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@@ -2256,7 +2256,7 @@
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@@ -2341,7 +2341,7 @@
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@@ -2705,7 +2705,7 @@
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@@ -2812,7 +2812,7 @@
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@@ -2923,7 +2923,7 @@
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@@ -3038,7 +3038,7 @@
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@@ -3283,7 +3283,7 @@
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@@ -3410,7 +3410,7 @@
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@@ -3537,7 +3537,7 @@
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@@ -3664,7 +3664,7 @@
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@@ -3791,7 +3791,7 @@
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@@ -3918,7 +3918,7 @@
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@@ -4045,7 +4045,7 @@
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@@ -4172,7 +4172,7 @@
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@@ -4299,7 +4299,7 @@
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@@ -4426,7 +4426,7 @@
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@@ -4553,7 +4553,7 @@
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@@ -4680,7 +4680,7 @@
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diff --git a/v3/example-code/sqrt.golden b/v3/example-code/sqrt.golden
index f091f44c5..324f6870c 100644
--- a/v3/example-code/sqrt.golden
+++ b/v3/example-code/sqrt.golden
@@ -413,7 +413,7 @@
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@@ -509,7 +509,7 @@
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@@ -605,7 +605,7 @@
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@@ -622,7 +622,7 @@
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@@ -718,7 +718,7 @@
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@@ -735,7 +735,7 @@
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@@ -831,7 +831,7 @@
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@@ -849,7 +849,7 @@
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@@ -946,7 +946,7 @@
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@@ -1042,7 +1042,7 @@
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@@ -1059,7 +1059,7 @@
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+            "guess": 1.000
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@@ -1155,7 +1155,7 @@
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@@ -1172,7 +1172,7 @@
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@@ -1268,7 +1268,7 @@
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+            "guess": 1.000
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@@ -1285,7 +1285,7 @@
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+            "guess": 1.000
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@@ -1302,8 +1302,8 @@
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-            "b": 9.0
+            "a": 1.000, 
+            "b": 9.000
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@@ -1400,7 +1400,7 @@
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+            "guess": 1.000
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@@ -1417,7 +1417,7 @@
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@@ -1434,8 +1434,8 @@
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@@ -1532,7 +1532,7 @@
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@@ -1549,7 +1549,7 @@
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@@ -1566,9 +1566,9 @@
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+            "a": 1.000, 
+            "__return__": 5.000, 
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@@ -1666,7 +1666,7 @@
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@@ -1683,8 +1683,8 @@
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@@ -1781,7 +1781,7 @@
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@@ -1798,7 +1798,7 @@
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@@ -1894,7 +1894,7 @@
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@@ -1911,7 +1911,7 @@
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@@ -2007,7 +2007,7 @@
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@@ -2024,7 +2024,7 @@
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@@ -2041,7 +2041,7 @@
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@@ -2137,7 +2137,7 @@
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@@ -2154,7 +2154,7 @@
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+            "guess": 5.000
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@@ -2171,7 +2171,7 @@
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+            "guess": 5.000
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@@ -2267,7 +2267,7 @@
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@@ -2284,7 +2284,7 @@
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@@ -2302,7 +2302,7 @@
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-            "guess": 5.0
+            "guess": 5.000
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@@ -2399,7 +2399,7 @@
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@@ -2416,7 +2416,7 @@
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@@ -2512,7 +2512,7 @@
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@@ -2529,7 +2529,7 @@
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+            "guess": 5.000
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@@ -2546,7 +2546,7 @@
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-            "guess": 5.0
+            "guess": 5.000
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@@ -2642,7 +2642,7 @@
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@@ -2659,7 +2659,7 @@
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@@ -2676,7 +2676,7 @@
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@@ -2772,7 +2772,7 @@
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+            "guess": 1.000
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@@ -2789,7 +2789,7 @@
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+            "guess": 5.000
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@@ -2806,7 +2806,7 @@
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+            "guess": 5.000
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@@ -2823,8 +2823,8 @@
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-            "b": 1.8
+            "a": 5.000, 
+            "b": 1.800
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@@ -2921,7 +2921,7 @@
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@@ -2938,7 +2938,7 @@
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@@ -2955,7 +2955,7 @@
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@@ -2972,8 +2972,8 @@
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           "encoded_locals": {
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-            "b": 1.8
+            "a": 5.000, 
+            "b": 1.800
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@@ -3070,7 +3070,7 @@
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@@ -3087,7 +3087,7 @@
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@@ -3104,7 +3104,7 @@
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@@ -3121,9 +3121,9 @@
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+            "a": 5.000, 
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+            "b": 2.977
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -6575,7 +6575,7 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "guess": 1.0
+            "guess": 1.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6592,7 +6592,7 @@
         {
           "frame_id": 6, 
           "encoded_locals": {
-            "guess": 5.0
+            "guess": 5.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6609,7 +6609,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.4
+            "guess": 3.400
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6626,7 +6626,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235
+            "guess": 3.023
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6643,7 +6643,7 @@
         {
           "frame_id": 16, 
           "encoded_locals": {
-            "guess": 3.0235
+            "guess": 3.023
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6660,8 +6660,8 @@
         {
           "frame_id": 17, 
           "encoded_locals": {
-            "a": 3.0235, 
-            "b": 2.9767
+            "a": 3.023, 
+            "b": 2.977
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -6758,7 +6758,7 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "guess": 1.0
+            "guess": 1.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6775,7 +6775,7 @@
         {
           "frame_id": 6, 
           "encoded_locals": {
-            "guess": 5.0
+            "guess": 5.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6792,7 +6792,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.4
+            "guess": 3.400
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6809,7 +6809,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235
+            "guess": 3.023
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6826,7 +6826,7 @@
         {
           "frame_id": 16, 
           "encoded_locals": {
-            "guess": 3.0235
+            "guess": 3.023
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6843,9 +6843,9 @@
         {
           "frame_id": 17, 
           "encoded_locals": {
-            "a": 3.0235, 
-            "__return__": 3.0001, 
-            "b": 2.9767
+            "a": 3.023, 
+            "__return__": 3.000, 
+            "b": 2.977
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -6943,7 +6943,7 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "guess": 1.0
+            "guess": 1.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6960,7 +6960,7 @@
         {
           "frame_id": 6, 
           "encoded_locals": {
-            "guess": 5.0
+            "guess": 5.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6977,7 +6977,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.4
+            "guess": 3.400
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -6994,7 +6994,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235
+            "guess": 3.023
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7011,8 +7011,8 @@
         {
           "frame_id": 16, 
           "encoded_locals": {
-            "__return__": 3.0001, 
-            "guess": 3.0235
+            "__return__": 3.000, 
+            "guess": 3.023
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -7109,7 +7109,7 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "guess": 1.0
+            "guess": 1.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7126,7 +7126,7 @@
         {
           "frame_id": 6, 
           "encoded_locals": {
-            "guess": 5.0
+            "guess": 5.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7143,7 +7143,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.4
+            "guess": 3.400
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7160,7 +7160,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235
+            "guess": 3.023
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7177,7 +7177,7 @@
         {
           "frame_id": 18, 
           "encoded_locals": {
-            "guess": 3.0001
+            "guess": 3.000
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -7273,7 +7273,7 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "guess": 1.0
+            "guess": 1.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7290,7 +7290,7 @@
         {
           "frame_id": 6, 
           "encoded_locals": {
-            "guess": 5.0
+            "guess": 5.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7307,7 +7307,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.4
+            "guess": 3.400
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7324,7 +7324,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235
+            "guess": 3.023
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7341,7 +7341,7 @@
         {
           "frame_id": 18, 
           "encoded_locals": {
-            "guess": 3.0001
+            "guess": 3.000
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -7437,7 +7437,7 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "guess": 1.0
+            "guess": 1.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7454,7 +7454,7 @@
         {
           "frame_id": 6, 
           "encoded_locals": {
-            "guess": 5.0
+            "guess": 5.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7471,7 +7471,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.4
+            "guess": 3.400
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7488,7 +7488,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235
+            "guess": 3.023
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7505,7 +7505,7 @@
         {
           "frame_id": 18, 
           "encoded_locals": {
-            "guess": 3.0001
+            "guess": 3.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7522,7 +7522,7 @@
         {
           "frame_id": 19, 
           "encoded_locals": {
-            "guess": 3.0001
+            "guess": 3.000
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -7618,7 +7618,7 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "guess": 1.0
+            "guess": 1.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7635,7 +7635,7 @@
         {
           "frame_id": 6, 
           "encoded_locals": {
-            "guess": 5.0
+            "guess": 5.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7652,7 +7652,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.4
+            "guess": 3.400
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7669,7 +7669,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235
+            "guess": 3.023
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7686,7 +7686,7 @@
         {
           "frame_id": 18, 
           "encoded_locals": {
-            "guess": 3.0001
+            "guess": 3.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7703,7 +7703,7 @@
         {
           "frame_id": 19, 
           "encoded_locals": {
-            "guess": 3.0001
+            "guess": 3.000
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -7799,7 +7799,7 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "guess": 1.0
+            "guess": 1.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7816,7 +7816,7 @@
         {
           "frame_id": 6, 
           "encoded_locals": {
-            "guess": 5.0
+            "guess": 5.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7833,7 +7833,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.4
+            "guess": 3.400
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7850,7 +7850,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235
+            "guess": 3.023
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7867,7 +7867,7 @@
         {
           "frame_id": 18, 
           "encoded_locals": {
-            "guess": 3.0001
+            "guess": 3.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7885,7 +7885,7 @@
           "frame_id": 19, 
           "encoded_locals": {
             "__return__": true, 
-            "guess": 3.0001
+            "guess": 3.000
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -7982,7 +7982,7 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "guess": 1.0
+            "guess": 1.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -7999,7 +7999,7 @@
         {
           "frame_id": 6, 
           "encoded_locals": {
-            "guess": 5.0
+            "guess": 5.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8016,7 +8016,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.4
+            "guess": 3.400
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8033,7 +8033,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235
+            "guess": 3.023
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8050,7 +8050,7 @@
         {
           "frame_id": 18, 
           "encoded_locals": {
-            "guess": 3.0001
+            "guess": 3.000
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -8146,7 +8146,7 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "guess": 1.0
+            "guess": 1.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8163,7 +8163,7 @@
         {
           "frame_id": 6, 
           "encoded_locals": {
-            "guess": 5.0
+            "guess": 5.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8180,7 +8180,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.4
+            "guess": 3.400
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8197,7 +8197,7 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "guess": 3.0235
+            "guess": 3.023
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8214,8 +8214,8 @@
         {
           "frame_id": 18, 
           "encoded_locals": {
-            "__return__": 3.0001, 
-            "guess": 3.0001
+            "__return__": 3.000, 
+            "guess": 3.000
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -8312,7 +8312,7 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "guess": 1.0
+            "guess": 1.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8329,7 +8329,7 @@
         {
           "frame_id": 6, 
           "encoded_locals": {
-            "guess": 5.0
+            "guess": 5.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8346,7 +8346,7 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "guess": 3.4
+            "guess": 3.400
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8363,8 +8363,8 @@
         {
           "frame_id": 14, 
           "encoded_locals": {
-            "__return__": 3.0001, 
-            "guess": 3.0235
+            "__return__": 3.000, 
+            "guess": 3.023
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -8461,7 +8461,7 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "guess": 1.0
+            "guess": 1.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8478,7 +8478,7 @@
         {
           "frame_id": 6, 
           "encoded_locals": {
-            "guess": 5.0
+            "guess": 5.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8495,8 +8495,8 @@
         {
           "frame_id": 10, 
           "encoded_locals": {
-            "__return__": 3.0001, 
-            "guess": 3.4
+            "__return__": 3.000, 
+            "guess": 3.400
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -8593,7 +8593,7 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "guess": 1.0
+            "guess": 1.000
           }, 
           "is_highlighted": false, 
           "is_parent": false, 
@@ -8610,8 +8610,8 @@
         {
           "frame_id": 6, 
           "encoded_locals": {
-            "__return__": 3.0001, 
-            "guess": 5.0
+            "__return__": 3.000, 
+            "guess": 5.000
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -8708,8 +8708,8 @@
         {
           "frame_id": 2, 
           "encoded_locals": {
-            "__return__": 3.0001, 
-            "guess": 1.0
+            "__return__": 3.000, 
+            "guess": 1.000
           }, 
           "is_highlighted": true, 
           "is_parent": false, 
@@ -8779,7 +8779,7 @@
               "REF", 
               3
             ], 
-            "__return__": 3.0001, 
+            "__return__": 3.000, 
             "x": 9, 
             "average": [
               "REF", 
@@ -8861,7 +8861,7 @@
               "REF", 
               3
             ], 
-            "__return__": 3.0001, 
+            "__return__": 3.000, 
             "x": 9, 
             "average": [
               "REF", 
@@ -8893,7 +8893,7 @@
           "REF", 
           1
         ], 
-        "ans": 3.0001
+        "ans": 3.000
       }, 
       "heap": {
         "1": [
diff --git a/v3/generate_json_trace.py b/v3/generate_json_trace.py
index ab00b91f1..809aa3807 100644
--- a/v3/generate_json_trace.py
+++ b/v3/generate_json_trace.py
@@ -12,6 +12,14 @@
 import sys, pg_logger, json
 
 
+# To make regression tests work consistently across platforms,
+# standardize display of floats to 3 significant figures
+#
+# Trick from:
+# http://stackoverflow.com/questions/1447287/format-floats-with-standard-json-module
+json.encoder.FLOAT_REPR = lambda f: ('%.3f' % f)
+
+
 def json_finalizer(input_code, output_trace):
   ret = dict(code=input_code, trace=output_trace)
   json_output = json.dumps(ret, indent=INDENT_LEVEL)
diff --git a/v3/tests/backend-tests/infinite_loop_one_liner.golden b/v3/tests/backend-tests/infinite_loop_one_liner.golden
index 93cda763e..23334dcc2 100644
--- a/v3/tests/backend-tests/infinite_loop_one_liner.golden
+++ b/v3/tests/backend-tests/infinite_loop_one_liner.golden
@@ -1,5 +1,5 @@
 {
-  "code": "while 1: print \"hahahaha\"\n", 
+  "code": "while 1:\n  print \"hahahaha\"\n", 
   "trace": [
     {
       "ordered_globals": [], 
@@ -11,6 +11,16 @@
       "line": 1, 
       "event": "step_line"
     }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
     {
       "ordered_globals": [], 
       "stdout": "hahahaha\n", 
@@ -18,7 +28,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -28,7 +38,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -38,7 +48,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -48,7 +58,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -58,7 +68,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -68,7 +78,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -78,7 +88,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -88,7 +98,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -98,7 +108,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -108,7 +118,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -118,7 +128,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -128,7 +138,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -138,7 +148,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -148,7 +158,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -158,7 +168,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -168,7 +178,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -178,7 +188,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -188,7 +198,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -198,7 +208,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -208,7 +218,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -218,7 +228,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
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     }, 
     {
@@ -2368,7 +2378,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2378,7 +2388,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2388,7 +2398,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2398,7 +2408,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2408,7 +2418,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2418,7 +2428,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2428,7 +2438,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2438,7 +2448,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2448,7 +2458,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2458,7 +2468,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2468,7 +2478,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2478,7 +2488,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2488,7 +2498,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2498,7 +2508,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2508,7 +2518,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2518,7 +2528,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2528,7 +2538,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2538,7 +2548,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2548,7 +2558,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2558,7 +2568,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2568,7 +2578,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2578,7 +2588,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2588,7 +2598,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2598,7 +2608,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2608,7 +2618,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2618,7 +2628,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2628,7 +2638,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2638,7 +2648,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2648,7 +2658,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2658,7 +2668,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2668,7 +2678,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2678,7 +2688,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2688,7 +2698,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2698,7 +2708,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2708,7 +2718,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2718,7 +2728,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2728,7 +2738,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2738,7 +2748,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2748,7 +2758,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2758,7 +2768,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2768,7 +2778,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2778,7 +2788,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2788,7 +2798,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2798,7 +2808,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2808,7 +2818,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2818,7 +2828,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2828,7 +2838,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2838,7 +2848,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2848,7 +2858,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2858,7 +2868,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2868,7 +2878,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2878,7 +2888,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2888,7 +2898,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2898,7 +2908,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2908,7 +2918,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2918,7 +2928,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2928,7 +2938,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2938,7 +2948,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2948,7 +2958,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2958,7 +2968,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2968,7 +2978,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2978,7 +2988,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
@@ -2988,17 +2998,7 @@
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
-      "line": 1, 
-      "event": "step_line"
-    }, 
-    {
-      "ordered_globals": [], 
-      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {}, 
-      "heap": {}, 
-      "line": 1, 
+      "line": 2, 
       "event": "step_line"
     }, 
     {
diff --git a/v3/tests/backend-tests/infinite_loop_one_liner.txt b/v3/tests/backend-tests/infinite_loop_one_liner.txt
index 9b79fb99d..e4c0bac1c 100644
--- a/v3/tests/backend-tests/infinite_loop_one_liner.txt
+++ b/v3/tests/backend-tests/infinite_loop_one_liner.txt
@@ -1 +1,2 @@
-while 1: print "hahahaha"
+while 1:
+  print "hahahaha"
diff --git a/v3/tests/backend-tests/pie-test.golden b/v3/tests/backend-tests/pie-test.golden
index c595719af..1a5218ee0 100644
--- a/v3/tests/backend-tests/pie-test.golden
+++ b/v3/tests/backend-tests/pie-test.golden
@@ -47,8 +47,8 @@
           "REF", 
           1
         ], 
-        "pi": 3.1416, 
-        "e": 2.7183
+        "pi": 3.142, 
+        "e": 2.718
       }, 
       "heap": {
         "1": [
@@ -74,9 +74,9 @@
           "REF", 
           1
         ], 
-        "pi": 3.1416, 
-        "e": 2.7183, 
-        "pie": 5.8599
+        "pi": 3.142, 
+        "e": 2.718, 
+        "pie": 5.860
       }, 
       "heap": {
         "1": [

From c1d3e2da67b82a853e778af1727b45ec5a7ccdd8 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 21 Sep 2012 14:23:21 -0700
Subject: [PATCH 421/502] add support for tracing imported modules (by skipping
 over module function calls)

---
 v3/pg_logger.py                               |  14 +-
 .../backend-tests/print_builtins_error.golden |  19 ---
 .../backend-tests/print_builtins_error.txt    |   1 -
 v3/tests/backend-tests/py-modules.golden      | 132 ++++++++++++++++++
 v3/tests/backend-tests/py-modules.txt         |   7 +
 5 files changed, 151 insertions(+), 22 deletions(-)
 delete mode 100644 v3/tests/backend-tests/print_builtins_error.golden
 delete mode 100644 v3/tests/backend-tests/print_builtins_error.txt
 create mode 100644 v3/tests/backend-tests/py-modules.golden
 create mode 100644 v3/tests/backend-tests/py-modules.txt

diff --git a/v3/pg_logger.py b/v3/pg_logger.py
index f8e5052ae..397d0cc5b 100644
--- a/v3/pg_logger.py
+++ b/v3/pg_logger.py
@@ -308,10 +308,20 @@ def interaction(self, frame, traceback, event_type):
         top_frame = tos[0]
         lineno = tos[1]
 
-        # don't trace inside of our __restricted_import__ helper function
-        if top_frame.f_code.co_name == '__restricted_import__':
+        # don't trace inside of ANY functions that aren't user-written code
+        # (e.g., those from imported modules -- e.g., random, re -- or the
+        # __restricted_import__ function in this file)
+        #
+        # it seems like user-written code has a filename of '',
+        # but maybe there are false positives too?
+        if self.canonic(frame.f_code.co_filename) != '':
           return
 
+        # don't trace inside of our __restricted_import__ helper function
+        # (this check is now subsumed by the above check)
+        #if top_frame.f_code.co_name == '__restricted_import__':
+        #  return
+
         self.encoder.reset_heap() # VERY VERY VERY IMPORTANT,
                                   # or else we won't properly capture heap object mutations in the trace!
 
diff --git a/v3/tests/backend-tests/print_builtins_error.golden b/v3/tests/backend-tests/print_builtins_error.golden
deleted file mode 100644
index dc24fd227..000000000
--- a/v3/tests/backend-tests/print_builtins_error.golden
+++ /dev/null
@@ -1,19 +0,0 @@
-{
-  "code": "print __builtins__\n", 
-  "trace": [
-    {
-      "ordered_globals": [], 
-      "stdout": "", 
-      "func_name": "", 
-      "stack_to_render": [], 
-      "globals": {}, 
-      "heap": {}, 
-      "line": 1, 
-      "event": "step_line"
-    }, 
-    {
-      "exception_msg": "Unknown error", 
-      "event": "uncaught_exception"
-    }
-  ]
-}
diff --git a/v3/tests/backend-tests/print_builtins_error.txt b/v3/tests/backend-tests/print_builtins_error.txt
deleted file mode 100644
index d4d03e56f..000000000
--- a/v3/tests/backend-tests/print_builtins_error.txt
+++ /dev/null
@@ -1 +0,0 @@
-print __builtins__
diff --git a/v3/tests/backend-tests/py-modules.golden b/v3/tests/backend-tests/py-modules.golden
new file mode 100644
index 000000000..6f5f87c33
--- /dev/null
+++ b/v3/tests/backend-tests/py-modules.golden
@@ -0,0 +1,132 @@
+{
+  "code": "# test to make sure nothing crashes when tracing code in pure-Python\n# function calls imported from modules\nimport random\nrandom.randint(10, 100)\n\nfrom re import compile\nx = compile('foo')\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "random"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "random": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "module", 
+          "random"
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "random"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "random": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "module", 
+          "random"
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "random", 
+        "compile"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "compile": [
+          "REF", 
+          2
+        ], 
+        "random": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "module", 
+          "random"
+        ], 
+        "2": [
+          "FUNCTION", 
+          "compile(pattern, flags)", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "random", 
+        "compile", 
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "compile": [
+          "REF", 
+          2
+        ], 
+        "x": [
+          "REF", 
+          3
+        ], 
+        "random": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "module", 
+          "random"
+        ], 
+        "2": [
+          "FUNCTION", 
+          "compile(pattern, flags)", 
+          null
+        ], 
+        "3": [
+          "_sre.SRE_Pattern", 
+          "<_sre.SRE_Pattern object at 0xADDR>"
+        ]
+      }, 
+      "line": 7, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/py-modules.txt b/v3/tests/backend-tests/py-modules.txt
new file mode 100644
index 000000000..eb4211809
--- /dev/null
+++ b/v3/tests/backend-tests/py-modules.txt
@@ -0,0 +1,7 @@
+# test to make sure nothing crashes when tracing code in pure-Python
+# function calls imported from modules
+import random
+random.randint(10, 100)
+
+from re import compile
+x = compile('foo')

From 74b87e5072ae9ac4edea7752574c6bc68bc45384 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 21 Sep 2012 15:37:45 -0700
Subject: [PATCH 422/502] Update v3/docs/user-FAQ.md

---
 v3/docs/user-FAQ.md | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/v3/docs/user-FAQ.md b/v3/docs/user-FAQ.md
index f79b662d3..5233e137d 100644
--- a/v3/docs/user-FAQ.md
+++ b/v3/docs/user-FAQ.md
@@ -15,13 +15,6 @@ it doesn't matter whether they're rendered in the stack or heap.
 Yep, that's a known bug; Online Python Tutor currently doesn't have much support for Unicode.
 
 
-#### Whoa, I get an unknown error when I try to use the `re` module (or other modules)
-
-Yep, Online Python Tutor currently has very limited support for external modules. The only module functions that work
-are those involving native C function calls (e.g., "import math; x = math.sqrt(9)"). Making **pure-Python
-function calls** in external modules will lead to an unknown error.
-
-
 #### Visualizations of object-oriented programs are confusing; why are there grayed-out frames everywhere?
 
 We haven't "cleaned-up" the visualizations to look better for OOP code examples;

From 9f58ac9fde2868ae7113a9e5e994fb236a509551 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 21 Sep 2012 18:16:50 -0700
Subject: [PATCH 423/502] improved handling of exceptions and got namedtuple
 working!

---
 v3/example-code/nonlocal.golden             |    2 +-
 v3/js/opt-frontend.js                       |    3 +
 v3/pg_logger.py                             |   54 +-
 v3/tests/backend-tests/exec_test.golden     |   17 +-
 v3/tests/backend-tests/import_error.golden  |    7 +-
 v3/tests/backend-tests/namedtuple.golden    | 5813 +++++++++++++++++++
 v3/tests/backend-tests/namedtuple.txt       |   25 +
 v3/tests/backend-tests/parse_error.golden   |    2 +-
 v3/tests/backend-tests/parse_error_2.golden |    2 +-
 v3/tests/backend-tests/parse_error_3.golden |    2 +-
 10 files changed, 5901 insertions(+), 26 deletions(-)
 create mode 100644 v3/tests/backend-tests/namedtuple.golden
 create mode 100644 v3/tests/backend-tests/namedtuple.txt

diff --git a/v3/example-code/nonlocal.golden b/v3/example-code/nonlocal.golden
index 7d3399bec..7f7631792 100644
--- a/v3/example-code/nonlocal.golden
+++ b/v3/example-code/nonlocal.golden
@@ -2,7 +2,7 @@
   "code": "# 'nonlocal' keyword is only in Python 3\ndef outer():\n    x = 1\n    def inner():\n        nonlocal x\n        x = 2\n        y = x\n        print(\"inner:\", x, y)\n    inner()\n    print(\"outer:\", x)\n\nouter()\n", 
   "trace": [
     {
-      "exception_msg": "Error: invalid syntax", 
+      "exception_msg": "SyntaxError: invalid syntax (, line 5)", 
       "line": 5, 
       "event": "uncaught_exception", 
       "offset": 18
diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 63ec82072..6da40717b 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -161,6 +161,9 @@ $(document).ready(function() {
 
                 alert(trace[0].exception_msg);
               }
+              else if (trace[trace.length - 1].exception_msg) {
+                alert(trace[trace.length - 1].exception_msg);
+              }
               else {
                 alert("Whoa, unknown error! Reload to try again, or report a bug to philip@pgbovine.net\n\n(Click the 'Generate URL' button to include a unique URL in your email bug report.)");
               }
diff --git a/v3/pg_logger.py b/v3/pg_logger.py
index 397d0cc5b..94f2468c0 100644
--- a/v3/pg_logger.py
+++ b/v3/pg_logger.py
@@ -312,10 +312,18 @@ def interaction(self, frame, traceback, event_type):
         # (e.g., those from imported modules -- e.g., random, re -- or the
         # __restricted_import__ function in this file)
         #
-        # it seems like user-written code has a filename of '',
-        # but maybe there are false positives too?
-        if self.canonic(frame.f_code.co_filename) != '':
-          return
+        # empirically, it seems like the FIRST entry in self.stack is
+        # the 'run' function from bdb.py, but everything else on the
+        # stack is the user program's "real stack"
+        for (cur_frame, cur_line) in self.stack[1:]:
+          # it seems like user-written code has a filename of '',
+          # but maybe there are false positives too?
+          if self.canonic(cur_frame.f_code.co_filename) != '':
+            return
+          # also don't trace inside of the magic "constructor" code
+          if cur_frame.f_code.co_name == '__new__':
+            return
+
 
         # don't trace inside of our __restricted_import__ helper function
         # (this check is now subsumed by the above check)
@@ -708,19 +716,26 @@ def _runscript(self, script_str):
 
           trace_entry = dict(event='uncaught_exception')
 
-          exc = sys.exc_info()[1]
-          if hasattr(exc, 'lineno'):
-            trace_entry['line'] = exc.lineno
-          if hasattr(exc, 'offset'):
-            trace_entry['offset'] = exc.offset
+          (exc_type, exc_val, exc_tb) = sys.exc_info()
+          if hasattr(exc_val, 'lineno'):
+            trace_entry['line'] = exc_val.lineno
+          if hasattr(exc_val, 'offset'):
+            trace_entry['offset'] = exc_val.offset
+
+          trace_entry['exception_msg'] = type(exc_val).__name__ + ": " +  str(exc_val)
+
+          # SUPER SUBTLE! if this exact same exception has already been
+          # recorded by the program, then DON'T record it again as an
+          # uncaught_exception
+          already_caught = False
+          for e in self.trace:
+            if e['event'] == 'exception' and e['exception_msg'] == trace_entry['exception_msg']:
+              already_caught = True
+              break
 
-          if hasattr(exc, 'msg'):
-            trace_entry['exception_msg'] = "Error: " + exc.msg
-          else:
-            trace_entry['exception_msg'] = "Unknown error"
+          if not already_caught:
+            self.trace.append(trace_entry)
 
-          self.trace.append(trace_entry)
-          #self.finalize()
           raise bdb.BdbQuit # need to forceably STOP execution
 
 
@@ -734,6 +749,8 @@ def finalize(self):
 
       assert len(self.trace) <= (MAX_EXECUTED_LINES + 1)
 
+      # don't do this anymore ...
+      '''
       # filter all entries after 'return' from '', since they
       # seem extraneous:
       res = []
@@ -741,8 +758,11 @@ def finalize(self):
         res.append(e)
         if e['event'] == 'return' and e['func_name'] == '':
           break
+      '''
+
+      res = self.trace
 
-      # another hack: if the SECOND to last entry is an 'exception'
+      # if the SECOND to last entry is an 'exception'
       # and the last entry is return from , then axe the last
       # entry, for aesthetic reasons :)
       if len(res) >= 2 and \
@@ -752,8 +772,6 @@ def finalize(self):
 
       self.trace = res
 
-      #for e in self.trace: print >> sys.stderr, e
-
       self.finalizer_func(self.executed_script, self.trace)
 
 
diff --git a/v3/tests/backend-tests/exec_test.golden b/v3/tests/backend-tests/exec_test.golden
index aba0c1788..07b7269cf 100644
--- a/v3/tests/backend-tests/exec_test.golden
+++ b/v3/tests/backend-tests/exec_test.golden
@@ -34,13 +34,26 @@
     {
       "ordered_globals": [], 
       "stdout": "", 
-      "exception_msg": "ImportError: os not supported", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
       "line": 1, 
-      "event": "exception"
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "return"
+    }, 
+    {
+      "exception_msg": "ImportError: os not supported", 
+      "event": "uncaught_exception"
     }
   ]
 }
diff --git a/v3/tests/backend-tests/import_error.golden b/v3/tests/backend-tests/import_error.golden
index 96e9fa679..05a889187 100644
--- a/v3/tests/backend-tests/import_error.golden
+++ b/v3/tests/backend-tests/import_error.golden
@@ -14,13 +14,16 @@
     {
       "ordered_globals": [], 
       "stdout": "", 
-      "exception_msg": "ImportError: os not supported", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {}, 
       "heap": {}, 
       "line": 2, 
-      "event": "exception"
+      "event": "return"
+    }, 
+    {
+      "exception_msg": "ImportError: os not supported", 
+      "event": "uncaught_exception"
     }
   ]
 }
diff --git a/v3/tests/backend-tests/namedtuple.golden b/v3/tests/backend-tests/namedtuple.golden
new file mode 100644
index 000000000..eaf6c5775
--- /dev/null
+++ b/v3/tests/backend-tests/namedtuple.golden
@@ -0,0 +1,5813 @@
+{
+  "code": "from collections import namedtuple\n\nRestaurant = namedtuple('Restaurant', 'name cuisine phone dish price')\n\nR1 = Restaurant(\"Taillevent\", \"French\", \"343-3434\", \"Escargots\", 24.50)\nR2 = Restaurant(\"La Tour D'Argent\", \"French\", \"343-3344\", \"Ris de Veau\", 48.50)\nR3 = Restaurant(\"Pascal\", \"French\", \"333-4444\", \"Bouillabaisse\", 32.00)\nR4 = Restaurant(\"Thai Touch\", \"Thai\", \"444-3333\", \"Mee Krob\", 10.95)\nR5 = Restaurant(\"Thai Dishes\", \"Thai\", \"333-4433\", \"Paht Woon Sen\",  8.50)\nR6 = Restaurant(\"Thai Spoon\", \"Thai\", \"334-3344\", \"Mussamun\", 9.00)\nR7 = Restaurant(\"McDonald's\", \"Burgers\", \"333-4443\", \"Big Mac\", 3.95)\nR8 = Restaurant(\"Burger King\", \"Burgers\", \"444-3344\", \"Whopper\", 3.75)\nR9 = Restaurant(\"Wahoo's\", \"Fish Tacos\", \"443-4443\", \"Mahi Mahi Burrito\", 7.50)\nR10 = Restaurant(\"In-N-Out Burger\", \"Burgers\", \"434-3344\", \"Cheeseburger\", 2.50)\nR11 = Restaurant(\"The Shack\", \"Burgers\", \"333-3334\", \"Hot Link Burger\", 4.50)\nR12 = Restaurant(\"Gina's\", \"Pizza\", \"334-4433\", \"Combo Pizza\", 12.95)\nR13 = Restaurant(\"Peacock, Room\", \"Indian\", \"333-4443\", \"Rogan Josh\", 12.50)\nR14 = Restaurant(\"Gaylord\", \"Indian\", \"333-3433\", \"Tandoori Chicken\", 13.50)\nR15 = Restaurant(\"Mr. Chow\", \"Chinese\", \"222-3333\", \"Peking Duck\", 24.50)\nR16 = Restaurant(\"Chez Panisse\", \"California\", \"222-3322\", \"Grilled Duck Breast\", 25.00)\nR17 = Restaurant(\"Spago\", \"California\", \"333-2222\", \"Striped Bass\", 24.50)\nR18 = Restaurant(\"Sriped Bass\", \"Seafood\", \"333-2233\", \"Cedar Plank Salmon\", 21.50)\nR19 = Restaurant(\"Golden Pagoda\", \"Chinese\", \"232-3232\", \"Egg Foo Young\", 8.50)\nR20 = Restaurant(\"Langer's\", \"Delicatessen\", \"333-2223\", \"Pastrami Sandwich\", 11.50)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "namedtuple"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "namedtuple": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "namedtuple(typename, field_names, verbose)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "namedtuple", 
+        "Restaurant"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "namedtuple": [
+          "REF", 
+          1
+        ], 
+        "Restaurant": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "namedtuple(typename, field_names, verbose)", 
+          null
+        ], 
+        "2": [
+          "CLASS", 
+          "Restaurant", 
+          [
+            "tuple"
+          ], 
+          [
+            "__getnewargs__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__new__", 
+            [
+              "REF", 
+              4
+            ]
+          ], 
+          [
+            "__repr__", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__slots__", 
+            [
+              "REF", 
+              6
+            ]
+          ], 
+          [
+            "_asdict", 
+            [
+              "REF", 
+              7
+            ]
+          ], 
+          [
+            "_fields", 
+            [
+              "REF", 
+              8
+            ]
+          ], 
+          [
+            "_make", 
+            [
+              "REF", 
+              9
+            ]
+          ], 
+          [
+            "_replace", 
+            [
+              "REF", 
+              10
+            ]
+          ], 
+          [
+            "cuisine", 
+            [
+              "REF", 
+              11
+            ]
+          ], 
+          [
+            "dish", 
+            [
+              "REF", 
+              12
+            ]
+          ], 
+          [
+            "name", 
+            [
+              "REF", 
+              13
+            ]
+          ], 
+          [
+            "phone", 
+            [
+              "REF", 
+              14
+            ]
+          ], 
+          [
+            "price", 
+            [
+              "REF", 
+              15
+            ]
+          ]
+        ], 
+        "3": [
+          "FUNCTION", 
+          "__getnewargs__(self)", 
+          null
+        ], 
+        "4": [
+          "staticmethod", 
+          ""
+        ], 
+        "5": [
+          "FUNCTION", 
+          "__repr__(self)", 
+          null
+        ], 
+        "6": [
+          "TUPLE"
+        ], 
+        "7": [
+          "FUNCTION", 
+          "_asdict(t)", 
+          null
+        ], 
+        "8": [
+          "TUPLE", 
+          "name", 
+          "cuisine", 
+          "phone", 
+          "dish", 
+          "price"
+        ], 
+        "9": [
+          "classmethod", 
+          ""
+        ], 
+        "10": [
+          "FUNCTION", 
+          "_replace(_self, **kwds)", 
+          null
+        ], 
+        "11": [
+          "property", 
+          ""
+        ], 
+        "12": [
+          "property", 
+          ""
+        ], 
+        "13": [
+          "property", 
+          ""
+        ], 
+        "14": [
+          "property", 
+          ""
+        ], 
+        "15": [
+          "property", 
+          ""
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "namedtuple", 
+        "Restaurant", 
+        "R1"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "namedtuple": [
+          "REF", 
+          1
+        ], 
+        "R1": [
+          "REF", 
+          16
+        ], 
+        "Restaurant": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "namedtuple(typename, field_names, verbose)", 
+          null
+        ], 
+        "2": [
+          "CLASS", 
+          "Restaurant", 
+          [
+            "tuple"
+          ], 
+          [
+            "__getnewargs__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__new__", 
+            [
+              "REF", 
+              4
+            ]
+          ], 
+          [
+            "__repr__", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__slots__", 
+            [
+              "REF", 
+              6
+            ]
+          ], 
+          [
+            "_asdict", 
+            [
+              "REF", 
+              7
+            ]
+          ], 
+          [
+            "_fields", 
+            [
+              "REF", 
+              8
+            ]
+          ], 
+          [
+            "_make", 
+            [
+              "REF", 
+              9
+            ]
+          ], 
+          [
+            "_replace", 
+            [
+              "REF", 
+              10
+            ]
+          ], 
+          [
+            "cuisine", 
+            [
+              "REF", 
+              11
+            ]
+          ], 
+          [
+            "dish", 
+            [
+              "REF", 
+              12
+            ]
+          ], 
+          [
+            "name", 
+            [
+              "REF", 
+              13
+            ]
+          ], 
+          [
+            "phone", 
+            [
+              "REF", 
+              14
+            ]
+          ], 
+          [
+            "price", 
+            [
+              "REF", 
+              15
+            ]
+          ]
+        ], 
+        "3": [
+          "FUNCTION", 
+          "__getnewargs__(self)", 
+          null
+        ], 
+        "4": [
+          "staticmethod", 
+          ""
+        ], 
+        "5": [
+          "FUNCTION", 
+          "__repr__(self)", 
+          null
+        ], 
+        "6": [
+          "TUPLE"
+        ], 
+        "7": [
+          "FUNCTION", 
+          "_asdict(t)", 
+          null
+        ], 
+        "8": [
+          "TUPLE", 
+          "name", 
+          "cuisine", 
+          "phone", 
+          "dish", 
+          "price"
+        ], 
+        "9": [
+          "classmethod", 
+          ""
+        ], 
+        "10": [
+          "FUNCTION", 
+          "_replace(_self, **kwds)", 
+          null
+        ], 
+        "11": [
+          "property", 
+          ""
+        ], 
+        "12": [
+          "property", 
+          ""
+        ], 
+        "13": [
+          "property", 
+          ""
+        ], 
+        "14": [
+          "property", 
+          ""
+        ], 
+        "15": [
+          "property", 
+          ""
+        ], 
+        "16": [
+          "INSTANCE", 
+          "Restaurant"
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "namedtuple", 
+        "Restaurant", 
+        "R1", 
+        "R2"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "namedtuple": [
+          "REF", 
+          1
+        ], 
+        "R1": [
+          "REF", 
+          16
+        ], 
+        "R2": [
+          "REF", 
+          17
+        ], 
+        "Restaurant": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "namedtuple(typename, field_names, verbose)", 
+          null
+        ], 
+        "2": [
+          "CLASS", 
+          "Restaurant", 
+          [
+            "tuple"
+          ], 
+          [
+            "__getnewargs__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__new__", 
+            [
+              "REF", 
+              4
+            ]
+          ], 
+          [
+            "__repr__", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__slots__", 
+            [
+              "REF", 
+              6
+            ]
+          ], 
+          [
+            "_asdict", 
+            [
+              "REF", 
+              7
+            ]
+          ], 
+          [
+            "_fields", 
+            [
+              "REF", 
+              8
+            ]
+          ], 
+          [
+            "_make", 
+            [
+              "REF", 
+              9
+            ]
+          ], 
+          [
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+        "R7", 
+        "R8", 
+        "R9", 
+        "R10", 
+        "R11", 
+        "R12", 
+        "R13", 
+        "R14", 
+        "R15", 
+        "R16", 
+        "R17", 
+        "R18", 
+        "R19", 
+        "R20"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "R5": [
+          "REF", 
+          20
+        ], 
+        "R16": [
+          "REF", 
+          31
+        ], 
+        "R17": [
+          "REF", 
+          32
+        ], 
+        "R14": [
+          "REF", 
+          29
+        ], 
+        "R15": [
+          "REF", 
+          30
+        ], 
+        "R12": [
+          "REF", 
+          27
+        ], 
+        "R13": [
+          "REF", 
+          28
+        ], 
+        "R10": [
+          "REF", 
+          25
+        ], 
+        "R11": [
+          "REF", 
+          26
+        ], 
+        "R3": [
+          "REF", 
+          18
+        ], 
+        "R18": [
+          "REF", 
+          33
+        ], 
+        "R19": [
+          "REF", 
+          34
+        ], 
+        "R4": [
+          "REF", 
+          19
+        ], 
+        "namedtuple": [
+          "REF", 
+          1
+        ], 
+        "R6": [
+          "REF", 
+          21
+        ], 
+        "R7": [
+          "REF", 
+          22
+        ], 
+        "R1": [
+          "REF", 
+          16
+        ], 
+        "R2": [
+          "REF", 
+          17
+        ], 
+        "Restaurant": [
+          "REF", 
+          2
+        ], 
+        "R8": [
+          "REF", 
+          23
+        ], 
+        "R9": [
+          "REF", 
+          24
+        ], 
+        "R20": [
+          "REF", 
+          35
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "namedtuple(typename, field_names, verbose)", 
+          null
+        ], 
+        "2": [
+          "CLASS", 
+          "Restaurant", 
+          [
+            "tuple"
+          ], 
+          [
+            "__getnewargs__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__new__", 
+            [
+              "REF", 
+              4
+            ]
+          ], 
+          [
+            "__repr__", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__slots__", 
+            [
+              "REF", 
+              6
+            ]
+          ], 
+          [
+            "_asdict", 
+            [
+              "REF", 
+              7
+            ]
+          ], 
+          [
+            "_fields", 
+            [
+              "REF", 
+              8
+            ]
+          ], 
+          [
+            "_make", 
+            [
+              "REF", 
+              9
+            ]
+          ], 
+          [
+            "_replace", 
+            [
+              "REF", 
+              10
+            ]
+          ], 
+          [
+            "cuisine", 
+            [
+              "REF", 
+              11
+            ]
+          ], 
+          [
+            "dish", 
+            [
+              "REF", 
+              12
+            ]
+          ], 
+          [
+            "name", 
+            [
+              "REF", 
+              13
+            ]
+          ], 
+          [
+            "phone", 
+            [
+              "REF", 
+              14
+            ]
+          ], 
+          [
+            "price", 
+            [
+              "REF", 
+              15
+            ]
+          ]
+        ], 
+        "3": [
+          "FUNCTION", 
+          "__getnewargs__(self)", 
+          null
+        ], 
+        "4": [
+          "staticmethod", 
+          ""
+        ], 
+        "5": [
+          "FUNCTION", 
+          "__repr__(self)", 
+          null
+        ], 
+        "6": [
+          "TUPLE"
+        ], 
+        "7": [
+          "FUNCTION", 
+          "_asdict(t)", 
+          null
+        ], 
+        "8": [
+          "TUPLE", 
+          "name", 
+          "cuisine", 
+          "phone", 
+          "dish", 
+          "price"
+        ], 
+        "9": [
+          "classmethod", 
+          ""
+        ], 
+        "10": [
+          "FUNCTION", 
+          "_replace(_self, **kwds)", 
+          null
+        ], 
+        "11": [
+          "property", 
+          ""
+        ], 
+        "12": [
+          "property", 
+          ""
+        ], 
+        "13": [
+          "property", 
+          ""
+        ], 
+        "14": [
+          "property", 
+          ""
+        ], 
+        "15": [
+          "property", 
+          ""
+        ], 
+        "16": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "17": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "18": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "19": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "20": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "21": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "22": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "23": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "24": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "25": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "26": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "27": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "28": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "29": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "30": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "31": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "32": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "33": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "34": [
+          "INSTANCE", 
+          "Restaurant"
+        ], 
+        "35": [
+          "INSTANCE", 
+          "Restaurant"
+        ]
+      }, 
+      "line": 24, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/namedtuple.txt b/v3/tests/backend-tests/namedtuple.txt
new file mode 100644
index 000000000..f9314c000
--- /dev/null
+++ b/v3/tests/backend-tests/namedtuple.txt
@@ -0,0 +1,25 @@
+from collections import namedtuple
+
+Restaurant = namedtuple('Restaurant', 'name cuisine phone dish price')
+
+R1 = Restaurant("Taillevent", "French", "343-3434", "Escargots", 24.50)
+R2 = Restaurant("La Tour D'Argent", "French", "343-3344", "Ris de Veau", 48.50)
+R3 = Restaurant("Pascal", "French", "333-4444", "Bouillabaisse", 32.00)
+R4 = Restaurant("Thai Touch", "Thai", "444-3333", "Mee Krob", 10.95)
+R5 = Restaurant("Thai Dishes", "Thai", "333-4433", "Paht Woon Sen",  8.50)
+R6 = Restaurant("Thai Spoon", "Thai", "334-3344", "Mussamun", 9.00)
+R7 = Restaurant("McDonald's", "Burgers", "333-4443", "Big Mac", 3.95)
+R8 = Restaurant("Burger King", "Burgers", "444-3344", "Whopper", 3.75)
+R9 = Restaurant("Wahoo's", "Fish Tacos", "443-4443", "Mahi Mahi Burrito", 7.50)
+R10 = Restaurant("In-N-Out Burger", "Burgers", "434-3344", "Cheeseburger", 2.50)
+R11 = Restaurant("The Shack", "Burgers", "333-3334", "Hot Link Burger", 4.50)
+R12 = Restaurant("Gina's", "Pizza", "334-4433", "Combo Pizza", 12.95)
+R13 = Restaurant("Peacock, Room", "Indian", "333-4443", "Rogan Josh", 12.50)
+R14 = Restaurant("Gaylord", "Indian", "333-3433", "Tandoori Chicken", 13.50)
+R15 = Restaurant("Mr. Chow", "Chinese", "222-3333", "Peking Duck", 24.50)
+R16 = Restaurant("Chez Panisse", "California", "222-3322", "Grilled Duck Breast", 25.00)
+R17 = Restaurant("Spago", "California", "333-2222", "Striped Bass", 24.50)
+R18 = Restaurant("Sriped Bass", "Seafood", "333-2233", "Cedar Plank Salmon", 21.50)
+R19 = Restaurant("Golden Pagoda", "Chinese", "232-3232", "Egg Foo Young", 8.50)
+R20 = Restaurant("Langer's", "Delicatessen", "333-2223", "Pastrami Sandwich", 11.50)
+
diff --git a/v3/tests/backend-tests/parse_error.golden b/v3/tests/backend-tests/parse_error.golden
index d16836a2c..047dce543 100644
--- a/v3/tests/backend-tests/parse_error.golden
+++ b/v3/tests/backend-tests/parse_error.golden
@@ -2,7 +2,7 @@
   "code": "x = 0\nfor i in range(10):\n  x += 1\n   print x\n  x += 1\n\n", 
   "trace": [
     {
-      "exception_msg": "Error: unexpected indent", 
+      "exception_msg": "IndentationError: unexpected indent (, line 4)", 
       "line": 4, 
       "event": "uncaught_exception", 
       "offset": 3
diff --git a/v3/tests/backend-tests/parse_error_2.golden b/v3/tests/backend-tests/parse_error_2.golden
index 52ebc60a5..a6973b8ee 100644
--- a/v3/tests/backend-tests/parse_error_2.golden
+++ b/v3/tests/backend-tests/parse_error_2.golden
@@ -2,7 +2,7 @@
   "code": "x = 5\ny = x\nz = x + y\n\nfor x haslk;fjlasfhlkjl;sa\n", 
   "trace": [
     {
-      "exception_msg": "Error: invalid syntax", 
+      "exception_msg": "SyntaxError: invalid syntax (, line 5)", 
       "line": 5, 
       "event": "uncaught_exception", 
       "offset": 11
diff --git a/v3/tests/backend-tests/parse_error_3.golden b/v3/tests/backend-tests/parse_error_3.golden
index cc161e2b7..8ae537dd0 100644
--- a/v3/tests/backend-tests/parse_error_3.golden
+++ b/v3/tests/backend-tests/parse_error_3.golden
@@ -2,7 +2,7 @@
   "code": "x = []\nfor i in range(10):\n    x.append(i)\n    if i == 24:\n        pass\n   print y\n", 
   "trace": [
     {
-      "exception_msg": "Error: unindent does not match any outer indentation level", 
+      "exception_msg": "IndentationError: unindent does not match any outer indentation level (, line 6)", 
       "line": 6, 
       "event": "uncaught_exception", 
       "offset": 11

From e6d4f8e37407d2e90cf472e2f8b9e5a4eb06e39a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 21 Sep 2012 19:21:52 -0700
Subject: [PATCH 424/502] WHAT THE?!?

---
 v3/pg_logger.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/v3/pg_logger.py b/v3/pg_logger.py
index 94f2468c0..36b1e0147 100644
--- a/v3/pg_logger.py
+++ b/v3/pg_logger.py
@@ -703,7 +703,12 @@ def _runscript(self, script_str):
 
             # protect against unauthorized filesystem accesses ...
             resource.setrlimit(resource.RLIMIT_NOFILE, (0, 0)) # no opened files allowed
-            resource.setrlimit(resource.RLIMIT_FSIZE, (0, 0))  # (redundancy for paranoia)
+
+            # VERY WEIRD. If you activate this resource limitation, it
+            # ends up generating an EMPTY trace for the following program:
+            #   "x = 0\nfor i in range(10):\n  x += 1\n   print x\n  x += 1\n"
+            # (at least on my Webfaction hosting with Python 2.7)
+            #resource.setrlimit(resource.RLIMIT_FSIZE, (0, 0))  # (redundancy for paranoia)
 
           self.run(script_str, user_globals, user_globals)
         # sys.exit ...

From 685a7f9134d18357e3eea3a0635fcbb1d4e599f6 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 21 Sep 2012 22:44:43 -0700
Subject: [PATCH 425/502] extra security precaution

---
 v3/pg_logger.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/v3/pg_logger.py b/v3/pg_logger.py
index 36b1e0147..6818bdbc7 100644
--- a/v3/pg_logger.py
+++ b/v3/pg_logger.py
@@ -710,6 +710,19 @@ def _runscript(self, script_str):
             # (at least on my Webfaction hosting with Python 2.7)
             #resource.setrlimit(resource.RLIMIT_FSIZE, (0, 0))  # (redundancy for paranoia)
 
+            # sys.modules contains an in-memory cache of already-loaded
+            # modules, so if you delete modules from here, they will
+            # need to be re-loaded from the filesystem.
+            #
+            # Thus, as an extra precaution, remove these modules so that
+            # they can't be re-imported without opening a new file,
+            # which is disallowed by resource.RLIMIT_NOFILE
+            #
+            # Of course, this isn't a foolproof solution by any means,
+            # and it might lead to UNEXPECTED FAILURES later in execution.
+            del sys.modules['os']
+            del sys.modules['sys']
+
           self.run(script_str, user_globals, user_globals)
         # sys.exit ...
         except SystemExit:

From 50c5035c655cfd46ea7ccc3f6c3ebca8c6866d66 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 21 Sep 2012 23:52:26 -0700
Subject: [PATCH 426/502] Update v3/docs/project-ideas.md

---
 v3/docs/project-ideas.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/v3/docs/project-ideas.md b/v3/docs/project-ideas.md
index d81af9039..6fd2e78b8 100644
--- a/v3/docs/project-ideas.md
+++ b/v3/docs/project-ideas.md
@@ -95,6 +95,12 @@ https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/opt-trace-form
 
 ... and the frontend should be able to visualize it!
 
+My
+[master's thesis](http://pgbovine.net/projects/pubs/guo-mixedlevel-mengthesis.pdf) from 2006
+describes one possible technique for building a C-language backend based upon the [Valgrind](http://www.valgrind.org)
+tool. More importantly, it describes the difficulties involved in creating a robust execution
+trace generator for C and C++. It should be much easier to build a backend for a memory- and type-safe language, though :)
+
 
 ## Migrate OPT backend to Skulpt (very hard but super cool!)
 

From d858959586c05f62c2e23027292c34693587ae46 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 22 Sep 2012 22:24:53 -0700
Subject: [PATCH 427/502] started refactoring test suite to add Python 3
 support

---
 v3/tests/golden_test.py | 60 ++++++++++++++++++++++++-----------------
 1 file changed, 35 insertions(+), 25 deletions(-)

diff --git a/v3/tests/golden_test.py b/v3/tests/golden_test.py
index d936f2741..2b451ecde 100644
--- a/v3/tests/golden_test.py
+++ b/v3/tests/golden_test.py
@@ -9,21 +9,6 @@
 from subprocess import *
 
 
-PROGRAM = ['python', '../generate_json_trace.py']
-
-INPUT_FILE_EXTENSION = '.txt' # input test files are .txt, NOT .py
-
-
-ALL_TESTS = []
-
-for (pwd, subdirs, files) in os.walk('.', followlinks=True): # need to follow example-code symlink
-  for f in files:
-    (base, ext) = os.path.splitext(f)
-    if ext == INPUT_FILE_EXTENSION:
-      fullpath = os.path.join(pwd, f)
-      ALL_TESTS.append(fullpath)
-
-
 def filter_output(s):
   return s
 
@@ -41,7 +26,7 @@ def execute(input_filename):
   #  print stderr, '}'
 
   # capture stdout into outfile, filtering out machine-specific addresses
-  outfile = base + '.out'
+  outfile = base + OUTPUT_FILE_EXTENSION
   outf = open(outfile, 'w')
 
   for line in stdout.splitlines():
@@ -53,7 +38,7 @@ def execute(input_filename):
 
 def clobber_golden_file(golden_file):
   (base, ext) = os.path.splitext(golden_file)
-  outfile = base + '.out'
+  outfile = base + OUTPUT_FILE_EXTENSION
   assert os.path.isfile(outfile)
   print '  Clobber %s => %s' % (outfile, golden_file)
   shutil.copy(outfile, golden_file)
@@ -62,7 +47,7 @@ def clobber_golden_file(golden_file):
 # returns True if there is a diff, False otherwise
 def golden_differs_from_out(golden_file):
   (base, ext) = os.path.splitext(golden_file)
-  outfile = base + '.out'
+  outfile = base + OUTPUT_FILE_EXTENSION
   assert os.path.isfile(outfile)
   assert os.path.isfile(golden_file)
 
@@ -78,9 +63,9 @@ def golden_differs_from_out(golden_file):
 def diff_test_output(test_name):
   (base, ext) = os.path.splitext(test_name)
 
-  golden_file = base + '.golden'
+  golden_file = base + GOLDEN_FILE_EXTENSION
   assert os.path.isfile(golden_file)
-  outfile = base + '.out'
+  outfile = base + OUTPUT_FILE_EXTENSION
   assert os.path.isfile(outfile)
 
   golden_s = open(golden_file).readlines()
@@ -105,14 +90,14 @@ def run_test(input_filename, clobber_golden=False):
   assert ext == INPUT_FILE_EXTENSION
 
   # to eliminate possibility of using stale output:
-  outfile = base + '.out'
+  outfile = base + OUTPUT_FILE_EXTENSION
   if os.path.isfile(outfile):
     os.remove(outfile)
 
   input_fullpath = input_filename
   execute(input_fullpath)
 
-  golden_file = base + '.golden'
+  golden_file = base + GOLDEN_FILE_EXTENSION
   if os.path.isfile(golden_file):
     if golden_differs_from_out(golden_file):
       print "  FAILED!!!"
@@ -142,10 +127,35 @@ def diff_all_test_outputs():
   parser.add_option("--test", dest="test_name",
                     help="Run one test")
   parser.add_option("--difftest", dest="diff_test_name",
-                    help="Diff against .golden for one test")
+                    help="Diff against golden file for one test")
   parser.add_option("--diffall", action="store_true", dest="diff_all",
-                    help="Diff against .golden for all tests")
+                    help="Diff against golden file for all tests")
+  parser.add_option("--py3", action="store_true", dest="py3",
+                    help="Run Python 3 tests (rather than Python 2)")
   (options, args) = parser.parse_args()
+
+
+  INPUT_FILE_EXTENSION = '.txt' # input test files are .txt, NOT .py
+
+  if options.py3:
+    PROGRAM = ['python3', '../generate_json_trace.py']
+    OUTPUT_FILE_EXTENSION = '.out_py3'
+    GOLDEN_FILE_EXTENSION = '.golden_py3'
+  else:
+    PROGRAM = ['python2', '../generate_json_trace.py']
+    OUTPUT_FILE_EXTENSION = '.out'
+    GOLDEN_FILE_EXTENSION = '.golden'
+
+  ALL_TESTS = []
+
+  for (pwd, subdirs, files) in os.walk('.', followlinks=True): # need to follow example-code symlink
+    for f in files:
+      (base, ext) = os.path.splitext(f)
+      if ext == INPUT_FILE_EXTENSION:
+        fullpath = os.path.join(pwd, f)
+        ALL_TESTS.append(fullpath)
+
+
   if options.run_all:
     if options.clobber:
       print 'Running all tests and clobbering results ...'
@@ -164,7 +174,7 @@ def diff_all_test_outputs():
   elif options.only_clobber:
     for t in ALL_TESTS:
       (base, ext) = os.path.splitext(t)
-      golden_file = base + '.golden'
+      golden_file = base + GOLDEN_FILE_EXTENSION
       clobber_golden_file(golden_file)
   else:
     parser.print_help()

From 7798026783272ebdf1d8685376910d63f791c6f2 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 22 Sep 2012 22:56:14 -0700
Subject: [PATCH 428/502] upgraded tests in preparation for python 3 parallel
 tests

---
 v3/example-code/list-comp.golden              |  108 +-
 .../backend-tests/caught_exception_1.golden   |    2 +-
 v3/tests/backend-tests/caught_exception_1.txt |    2 +-
 .../backend-tests/caught_exception_2.golden   |    2 +-
 v3/tests/backend-tests/caught_exception_2.txt |    6 +-
 v3/tests/backend-tests/class_test.golden      |    2 +-
 v3/tests/backend-tests/class_test.txt         |    4 +-
 v3/tests/backend-tests/class_test_2.golden    |    2 +-
 v3/tests/backend-tests/class_test_2.txt       |    2 +-
 v3/tests/backend-tests/class_test_3.golden    |    2 +-
 v3/tests/backend-tests/class_test_3.txt       |    6 +-
 v3/tests/backend-tests/dict_test.golden       |    6 +-
 v3/tests/backend-tests/dict_test.txt          |    2 +-
 v3/tests/backend-tests/exec_test.golden       |    2 +-
 v3/tests/backend-tests/exec_test.txt          |    2 +-
 .../backend-tests/generator_use_test.golden   |    2 +-
 v3/tests/backend-tests/generator_use_test.txt |    2 +-
 v3/tests/backend-tests/infinite_loop.golden   |    2 +-
 v3/tests/backend-tests/infinite_loop.txt      |    4 +-
 .../infinite_loop_one_liner.golden            |    2 +-
 .../backend-tests/infinite_loop_one_liner.txt |    2 +-
 v3/tests/backend-tests/lambda_1.golden        |    2 +-
 v3/tests/backend-tests/lambda_1.txt           |    2 +-
 v3/tests/backend-tests/ling-scheme-3.golden   |    2 +-
 v3/tests/backend-tests/ling-scheme-3.txt      |    2 +-
 v3/tests/backend-tests/list_dict_test.golden  |    2 +-
 v3/tests/backend-tests/list_dict_test.txt     |    2 +-
 v3/tests/backend-tests/namedtuple.golden      | 4706 ++++++++++++++++-
 v3/tests/backend-tests/newstyle_class.golden  |    2 +-
 v3/tests/backend-tests/newstyle_class.txt     |    4 +-
 v3/tests/backend-tests/one_func.golden        |    2 +-
 v3/tests/backend-tests/one_func.txt           |    2 +-
 v3/tests/backend-tests/open_error.golden      |    2 +-
 v3/tests/backend-tests/open_error.txt         |    2 +-
 v3/tests/backend-tests/runtime_error.golden   |    2 +-
 v3/tests/backend-tests/runtime_error.txt      |    2 +-
 v3/tests/backend-tests/simple.golden          |    2 +-
 v3/tests/backend-tests/simple.txt             |    4 +-
 v3/tests/backend-tests/two_funcs.golden       |    2 +-
 v3/tests/backend-tests/two_funcs.txt          |    4 +-
 40 files changed, 4514 insertions(+), 398 deletions(-)

diff --git a/v3/example-code/list-comp.golden b/v3/example-code/list-comp.golden
index deb6d8b80..6a4ea270a 100644
--- a/v3/example-code/list-comp.golden
+++ b/v3/example-code/list-comp.golden
@@ -39,17 +39,12 @@
     {
       "ordered_globals": [
         "ppl", 
-        "_[1]", 
         "e"
       ], 
       "stdout": "", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
-        "_[1]": [
-          "REF", 
-          2
-        ], 
         "e": "Alice", 
         "ppl": [
           "REF", 
@@ -63,10 +58,6 @@
           "Bob", 
           "Carol", 
           "Doug"
-        ], 
-        "2": [
-          "LIST", 
-          "Alice!!"
         ]
       }, 
       "line": 2, 
@@ -75,17 +66,12 @@
     {
       "ordered_globals": [
         "ppl", 
-        "_[1]", 
         "e"
       ], 
       "stdout": "", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
-        "_[1]": [
-          "REF", 
-          2
-        ], 
         "e": "Bob", 
         "ppl": [
           "REF", 
@@ -99,11 +85,6 @@
           "Bob", 
           "Carol", 
           "Doug"
-        ], 
-        "2": [
-          "LIST", 
-          "Alice!!", 
-          "Bob!!"
         ]
       }, 
       "line": 2, 
@@ -112,17 +93,12 @@
     {
       "ordered_globals": [
         "ppl", 
-        "_[1]", 
         "e"
       ], 
       "stdout": "", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
-        "_[1]": [
-          "REF", 
-          2
-        ], 
         "e": "Carol", 
         "ppl": [
           "REF", 
@@ -136,12 +112,6 @@
           "Bob", 
           "Carol", 
           "Doug"
-        ], 
-        "2": [
-          "LIST", 
-          "Alice!!", 
-          "Bob!!", 
-          "Carol!!"
         ]
       }, 
       "line": 2, 
@@ -150,17 +120,12 @@
     {
       "ordered_globals": [
         "ppl", 
-        "_[1]", 
         "e"
       ], 
       "stdout": "", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
-        "_[1]": [
-          "REF", 
-          2
-        ], 
         "e": "Doug", 
         "ppl": [
           "REF", 
@@ -174,13 +139,6 @@
           "Bob", 
           "Carol", 
           "Doug"
-        ], 
-        "2": [
-          "LIST", 
-          "Alice!!", 
-          "Bob!!", 
-          "Carol!!", 
-          "Doug!!"
         ]
       }, 
       "line": 2, 
@@ -230,27 +188,22 @@
         "ppl", 
         "e", 
         "excited_ppl", 
-        "x", 
-        "_[2]"
+        "x"
       ], 
       "stdout": "", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
-        "x": "Alice", 
+        "e": "Doug", 
         "ppl": [
           "REF", 
           1
         ], 
-        "e": "Doug", 
         "excited_ppl": [
           "REF", 
           2
         ], 
-        "_[2]": [
-          "REF", 
-          3
-        ]
+        "x": "Alice"
       }, 
       "heap": {
         "1": [
@@ -266,10 +219,6 @@
           "Bob!!", 
           "Carol!!", 
           "Doug!!"
-        ], 
-        "3": [
-          "LIST", 
-          5
         ]
       }, 
       "line": 3, 
@@ -280,27 +229,22 @@
         "ppl", 
         "e", 
         "excited_ppl", 
-        "x", 
-        "_[2]"
+        "x"
       ], 
       "stdout": "", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
-        "x": "Bob", 
+        "e": "Doug", 
         "ppl": [
           "REF", 
           1
         ], 
-        "e": "Doug", 
         "excited_ppl": [
           "REF", 
           2
         ], 
-        "_[2]": [
-          "REF", 
-          3
-        ]
+        "x": "Bob"
       }, 
       "heap": {
         "1": [
@@ -316,11 +260,6 @@
           "Bob!!", 
           "Carol!!", 
           "Doug!!"
-        ], 
-        "3": [
-          "LIST", 
-          5, 
-          3
         ]
       }, 
       "line": 3, 
@@ -331,27 +270,22 @@
         "ppl", 
         "e", 
         "excited_ppl", 
-        "x", 
-        "_[2]"
+        "x"
       ], 
       "stdout": "", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
-        "x": "Carol", 
+        "e": "Doug", 
         "ppl": [
           "REF", 
           1
         ], 
-        "e": "Doug", 
         "excited_ppl": [
           "REF", 
           2
         ], 
-        "_[2]": [
-          "REF", 
-          3
-        ]
+        "x": "Carol"
       }, 
       "heap": {
         "1": [
@@ -367,12 +301,6 @@
           "Bob!!", 
           "Carol!!", 
           "Doug!!"
-        ], 
-        "3": [
-          "LIST", 
-          5, 
-          3, 
-          5
         ]
       }, 
       "line": 3, 
@@ -383,27 +311,22 @@
         "ppl", 
         "e", 
         "excited_ppl", 
-        "x", 
-        "_[2]"
+        "x"
       ], 
       "stdout": "", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
-        "x": "Doug", 
+        "e": "Doug", 
         "ppl": [
           "REF", 
           1
         ], 
-        "e": "Doug", 
         "excited_ppl": [
           "REF", 
           2
         ], 
-        "_[2]": [
-          "REF", 
-          3
-        ]
+        "x": "Doug"
       }, 
       "heap": {
         "1": [
@@ -419,13 +342,6 @@
           "Bob!!", 
           "Carol!!", 
           "Doug!!"
-        ], 
-        "3": [
-          "LIST", 
-          5, 
-          3, 
-          5, 
-          4
         ]
       }, 
       "line": 3, 
diff --git a/v3/tests/backend-tests/caught_exception_1.golden b/v3/tests/backend-tests/caught_exception_1.golden
index 7ca09e459..2418eb530 100644
--- a/v3/tests/backend-tests/caught_exception_1.golden
+++ b/v3/tests/backend-tests/caught_exception_1.golden
@@ -1,5 +1,5 @@
 {
-  "code": "try:\n  x = 1 / 0\nexcept:\n  print \"DIVIDE BY ZERO\"\n\n", 
+  "code": "try:\n  x = 1 / 0\nexcept:\n  print(\"DIVIDE BY ZERO\")\n\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/caught_exception_1.txt b/v3/tests/backend-tests/caught_exception_1.txt
index 1bf3cdec0..ad24ed88b 100644
--- a/v3/tests/backend-tests/caught_exception_1.txt
+++ b/v3/tests/backend-tests/caught_exception_1.txt
@@ -1,5 +1,5 @@
 try:
   x = 1 / 0
 except:
-  print "DIVIDE BY ZERO"
+  print("DIVIDE BY ZERO")
 
diff --git a/v3/tests/backend-tests/caught_exception_2.golden b/v3/tests/backend-tests/caught_exception_2.golden
index 75a3122cd..a1452b2f6 100644
--- a/v3/tests/backend-tests/caught_exception_2.golden
+++ b/v3/tests/backend-tests/caught_exception_2.golden
@@ -1,5 +1,5 @@
 {
-  "code": "# caught exception:\ntry:\n  x = 1 / 0\nexcept:\n  print \"DIVIDE BY ZERO\"\n\n\n# uncaught:\nprint y\n\nprint \"should not reach here\"\n\n", 
+  "code": "# caught exception:\ntry:\n  x = 1 / 0\nexcept:\n  print(\"DIVIDE BY ZERO\")\n\n\n# uncaught:\nprint(y)\n\nprint(\"should not reach here\")\n\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/caught_exception_2.txt b/v3/tests/backend-tests/caught_exception_2.txt
index 57c17019c..66768e16c 100644
--- a/v3/tests/backend-tests/caught_exception_2.txt
+++ b/v3/tests/backend-tests/caught_exception_2.txt
@@ -2,11 +2,11 @@
 try:
   x = 1 / 0
 except:
-  print "DIVIDE BY ZERO"
+  print("DIVIDE BY ZERO")
 
 
 # uncaught:
-print y
+print(y)
 
-print "should not reach here"
+print("should not reach here")
 
diff --git a/v3/tests/backend-tests/class_test.golden b/v3/tests/backend-tests/class_test.golden
index 882d13ef9..b0c902883 100644
--- a/v3/tests/backend-tests/class_test.golden
+++ b/v3/tests/backend-tests/class_test.golden
@@ -1,5 +1,5 @@
 {
-  "code": "class Point:\n    def __init__(self, x, y):\n        self.x = x\n        self.y = y\n    \n    def __str__(self):\n        return \"(%d, %d)\" % (self.x, self.y)\n\np = Point(1, 2)\nprint p\np2 = Point(3, -4)\nprint p2\n\n", 
+  "code": "class Point:\n    def __init__(self, x, y):\n        self.x = x\n        self.y = y\n    \n    def __str__(self):\n        return \"(%d, %d)\" % (self.x, self.y)\n\np = Point(1, 2)\nprint(p)\np2 = Point(3, -4)\nprint(p2)\n\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/class_test.txt b/v3/tests/backend-tests/class_test.txt
index f5046f056..77d89420a 100644
--- a/v3/tests/backend-tests/class_test.txt
+++ b/v3/tests/backend-tests/class_test.txt
@@ -7,7 +7,7 @@ class Point:
         return "(%d, %d)" % (self.x, self.y)
 
 p = Point(1, 2)
-print p
+print(p)
 p2 = Point(3, -4)
-print p2
+print(p2)
 
diff --git a/v3/tests/backend-tests/class_test_2.golden b/v3/tests/backend-tests/class_test_2.golden
index ae2a4ddd0..0ff698aca 100644
--- a/v3/tests/backend-tests/class_test_2.golden
+++ b/v3/tests/backend-tests/class_test_2.golden
@@ -1,5 +1,5 @@
 {
-  "code": "class Outer():\n   pass\n\no = Outer()\no.a = 5\no.b = \"Hi\"\nprint o\n\n", 
+  "code": "class Outer():\n   pass\n\no = Outer()\no.a = 5\no.b = \"Hi\"\nprint(o)\n\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/class_test_2.txt b/v3/tests/backend-tests/class_test_2.txt
index 47a9e13bb..c6532c1b1 100644
--- a/v3/tests/backend-tests/class_test_2.txt
+++ b/v3/tests/backend-tests/class_test_2.txt
@@ -4,5 +4,5 @@ class Outer():
 o = Outer()
 o.a = 5
 o.b = "Hi"
-print o
+print(o)
 
diff --git a/v3/tests/backend-tests/class_test_3.golden b/v3/tests/backend-tests/class_test_3.golden
index f351abf52..585a2db68 100644
--- a/v3/tests/backend-tests/class_test_3.golden
+++ b/v3/tests/backend-tests/class_test_3.golden
@@ -1,5 +1,5 @@
 {
-  "code": "class Staff601:\n    course = '6.01'\n    building = 34\n    room = 501\n\npat = Staff601()\nprint pat.course\n\npat.name = 'Pat'\npat.age = 60\npat.role = 'Professor'\n\nprint pat.building\npat.building = 32\nprint pat.building\n\n", 
+  "code": "class Staff601:\n    course = '6.01'\n    building = 34\n    room = 501\n\npat = Staff601()\nprint(pat.course)\n\npat.name = 'Pat'\npat.age = 60\npat.role = 'Professor'\n\nprint(pat.building)\npat.building = 32\nprint(pat.building)\n\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/class_test_3.txt b/v3/tests/backend-tests/class_test_3.txt
index a4a8068a0..55c604882 100644
--- a/v3/tests/backend-tests/class_test_3.txt
+++ b/v3/tests/backend-tests/class_test_3.txt
@@ -4,13 +4,13 @@ class Staff601:
     room = 501
 
 pat = Staff601()
-print pat.course
+print(pat.course)
 
 pat.name = 'Pat'
 pat.age = 60
 pat.role = 'Professor'
 
-print pat.building
+print(pat.building)
 pat.building = 32
-print pat.building
+print(pat.building)
 
diff --git a/v3/tests/backend-tests/dict_test.golden b/v3/tests/backend-tests/dict_test.golden
index 7f6d1c5a5..0c05ae2da 100644
--- a/v3/tests/backend-tests/dict_test.golden
+++ b/v3/tests/backend-tests/dict_test.golden
@@ -1,5 +1,5 @@
 {
-  "code": "x = {1 : 2}\nx[('tup', 'le')] = set([1, 2, 3])\n\ndef foo():\n  local_x = {1 : 2}\n  local_y = {}\n  local_y[('tup', 'le')] = set([1, 2, 3])\n  print \"hello\", local_y.values()\n\nfoo()\n", 
+  "code": "x = {1 : 2}\nx[('tup', 'le')] = set([1, 2, 3])\n\ndef foo():\n  local_x = {1 : 2}\n  local_y = {}\n  local_y[('tup', 'le')] = set([1, 2, 3])\n  print(\"hello\", list(local_y.values()))\n\nfoo()\n", 
   "trace": [
     {
       "ordered_globals": [], 
@@ -562,7 +562,7 @@
         "x", 
         "foo"
       ], 
-      "stdout": "hello [set([1, 2, 3])]\n", 
+      "stdout": "('hello', [set([1, 2, 3])])\n", 
       "func_name": "foo", 
       "stack_to_render": [
         {
@@ -675,7 +675,7 @@
         "x", 
         "foo"
       ], 
-      "stdout": "hello [set([1, 2, 3])]\n", 
+      "stdout": "('hello', [set([1, 2, 3])])\n", 
       "func_name": "", 
       "stack_to_render": [], 
       "globals": {
diff --git a/v3/tests/backend-tests/dict_test.txt b/v3/tests/backend-tests/dict_test.txt
index 41b541c1c..15294a473 100644
--- a/v3/tests/backend-tests/dict_test.txt
+++ b/v3/tests/backend-tests/dict_test.txt
@@ -5,6 +5,6 @@ def foo():
   local_x = {1 : 2}
   local_y = {}
   local_y[('tup', 'le')] = set([1, 2, 3])
-  print "hello", local_y.values()
+  print("hello", list(local_y.values()))
 
 foo()
diff --git a/v3/tests/backend-tests/exec_test.golden b/v3/tests/backend-tests/exec_test.golden
index 07b7269cf..38df5b0e7 100644
--- a/v3/tests/backend-tests/exec_test.golden
+++ b/v3/tests/backend-tests/exec_test.golden
@@ -1,5 +1,5 @@
 {
-  "code": "exec \"import os; os.system('echo security breach')\"\n", 
+  "code": "exec(\"import os; os.system('echo security breach')\")\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/exec_test.txt b/v3/tests/backend-tests/exec_test.txt
index 0d44e327d..7c8c740c7 100644
--- a/v3/tests/backend-tests/exec_test.txt
+++ b/v3/tests/backend-tests/exec_test.txt
@@ -1 +1 @@
-exec "import os; os.system('echo security breach')"
+exec("import os; os.system('echo security breach')")
diff --git a/v3/tests/backend-tests/generator_use_test.golden b/v3/tests/backend-tests/generator_use_test.golden
index 3639984d7..34e21934f 100644
--- a/v3/tests/backend-tests/generator_use_test.golden
+++ b/v3/tests/backend-tests/generator_use_test.golden
@@ -1,5 +1,5 @@
 {
-  "code": "def gen_odds():\n  x = 1\n  while True:\n    yield x\n    x += 2\n\nfor i in gen_odds():\n  print i\n\n", 
+  "code": "def gen_odds():\n  x = 1\n  while True:\n    yield x\n    x += 2\n\nfor i in gen_odds():\n  print(i)\n\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/generator_use_test.txt b/v3/tests/backend-tests/generator_use_test.txt
index 0577e1434..d4aee1010 100644
--- a/v3/tests/backend-tests/generator_use_test.txt
+++ b/v3/tests/backend-tests/generator_use_test.txt
@@ -5,5 +5,5 @@ def gen_odds():
     x += 2
 
 for i in gen_odds():
-  print i
+  print(i)
 
diff --git a/v3/tests/backend-tests/infinite_loop.golden b/v3/tests/backend-tests/infinite_loop.golden
index 1a9abd1e8..217546644 100644
--- a/v3/tests/backend-tests/infinite_loop.golden
+++ b/v3/tests/backend-tests/infinite_loop.golden
@@ -1,5 +1,5 @@
 {
-  "code": "# Fibonacci!!!\n\narr = [1, 1]\n\nprint arr[0]\n\nwhile True:\n  print arr[-1]\n  tmp = sum(arr)\n  arr.append(tmp)\n  del arr[0]\n\n", 
+  "code": "# Fibonacci!!!\n\narr = [1, 1]\n\nprint(arr[0])\n\nwhile True:\n  print(arr[-1])\n  tmp = sum(arr)\n  arr.append(tmp)\n  del arr[0]\n\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/infinite_loop.txt b/v3/tests/backend-tests/infinite_loop.txt
index bce78d1d0..b480914bb 100644
--- a/v3/tests/backend-tests/infinite_loop.txt
+++ b/v3/tests/backend-tests/infinite_loop.txt
@@ -2,10 +2,10 @@
 
 arr = [1, 1]
 
-print arr[0]
+print(arr[0])
 
 while True:
-  print arr[-1]
+  print(arr[-1])
   tmp = sum(arr)
   arr.append(tmp)
   del arr[0]
diff --git a/v3/tests/backend-tests/infinite_loop_one_liner.golden b/v3/tests/backend-tests/infinite_loop_one_liner.golden
index 23334dcc2..e28f84304 100644
--- a/v3/tests/backend-tests/infinite_loop_one_liner.golden
+++ b/v3/tests/backend-tests/infinite_loop_one_liner.golden
@@ -1,5 +1,5 @@
 {
-  "code": "while 1:\n  print \"hahahaha\"\n", 
+  "code": "while 1:\n  print(\"hahahaha\")\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/infinite_loop_one_liner.txt b/v3/tests/backend-tests/infinite_loop_one_liner.txt
index e4c0bac1c..6bc80597f 100644
--- a/v3/tests/backend-tests/infinite_loop_one_liner.txt
+++ b/v3/tests/backend-tests/infinite_loop_one_liner.txt
@@ -1,2 +1,2 @@
 while 1:
-  print "hahahaha"
+  print("hahahaha")
diff --git a/v3/tests/backend-tests/lambda_1.golden b/v3/tests/backend-tests/lambda_1.golden
index 329be1475..947c90d9d 100644
--- a/v3/tests/backend-tests/lambda_1.golden
+++ b/v3/tests/backend-tests/lambda_1.golden
@@ -1,5 +1,5 @@
 {
-  "code": "def summation(low, high, f, next):\n  s = 0\n  x = low\n  while x <= high:\n    s = s + f(x)\n    x = next(x)\n  return s\n\ndef sumsquares(low, high):\n  return summation(low, high, lambda x: x**2, lambda x: x+1)\n\nprint sumsquares(1, 5)\n", 
+  "code": "def summation(low, high, f, next):\n  s = 0\n  x = low\n  while x <= high:\n    s = s + f(x)\n    x = next(x)\n  return s\n\ndef sumsquares(low, high):\n  return summation(low, high, lambda x: x**2, lambda x: x+1)\n\nprint(sumsquares(1, 5))\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/lambda_1.txt b/v3/tests/backend-tests/lambda_1.txt
index 90504b5ec..da6d717e0 100644
--- a/v3/tests/backend-tests/lambda_1.txt
+++ b/v3/tests/backend-tests/lambda_1.txt
@@ -9,4 +9,4 @@ def summation(low, high, f, next):
 def sumsquares(low, high):
   return summation(low, high, lambda x: x**2, lambda x: x+1)
 
-print sumsquares(1, 5)
+print(sumsquares(1, 5))
diff --git a/v3/tests/backend-tests/ling-scheme-3.golden b/v3/tests/backend-tests/ling-scheme-3.golden
index be3b46e8e..d9ef80599 100644
--- a/v3/tests/backend-tests/ling-scheme-3.golden
+++ b/v3/tests/backend-tests/ling-scheme-3.golden
@@ -1,5 +1,5 @@
 {
-  "code": "def map(f, xs):\n  if xs == []:\n    return []\n  else:\n    return [f(xs[0])] + map(f, xs[1:])\n\ndef append(xs, ys):\n  if xs == []:\n    return ys\n  else:\n    return [xs[0]] + append(xs[1:], ys)\n\ndef pairs(xs):\n  if xs == []:\n    return []\n  elif xs[1:] == []:\n    return []\n  else:\n    return append(map(lambda x: [xs[0], x], xs[1:]), pairs(xs[1:]))\n\nresult = pairs([1, 2, 3])\n", 
+  "code": "def map(f, xs):\n  if xs == []:\n    return []\n  else:\n    return [f(xs[0])] + list(map(f, xs[1:]))\n\ndef append(xs, ys):\n  if xs == []:\n    return ys\n  else:\n    return [xs[0]] + append(xs[1:], ys)\n\ndef pairs(xs):\n  if xs == []:\n    return []\n  elif xs[1:] == []:\n    return []\n  else:\n    return append(map(lambda x: [xs[0], x], xs[1:]), pairs(xs[1:]))\n\nresult = pairs([1, 2, 3])\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/ling-scheme-3.txt b/v3/tests/backend-tests/ling-scheme-3.txt
index 8ae512cdb..14ee800e8 100644
--- a/v3/tests/backend-tests/ling-scheme-3.txt
+++ b/v3/tests/backend-tests/ling-scheme-3.txt
@@ -2,7 +2,7 @@ def map(f, xs):
   if xs == []:
     return []
   else:
-    return [f(xs[0])] + map(f, xs[1:])
+    return [f(xs[0])] + list(map(f, xs[1:]))
 
 def append(xs, ys):
   if xs == []:
diff --git a/v3/tests/backend-tests/list_dict_test.golden b/v3/tests/backend-tests/list_dict_test.golden
index bd24d36df..4baefb4f5 100644
--- a/v3/tests/backend-tests/list_dict_test.golden
+++ b/v3/tests/backend-tests/list_dict_test.golden
@@ -1,5 +1,5 @@
 {
-  "code": "x = {}\nl = ['hello', \"world\", 'goodbye']\nfor (i, e) in enumerate(l):\n    x[e] = i\nprint x\n\n", 
+  "code": "x = {}\nl = ['hello', \"world\", 'goodbye']\nfor (i, e) in enumerate(l):\n    x[e] = i\nprint(x)\n\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/list_dict_test.txt b/v3/tests/backend-tests/list_dict_test.txt
index 1d8179f6c..b44628526 100644
--- a/v3/tests/backend-tests/list_dict_test.txt
+++ b/v3/tests/backend-tests/list_dict_test.txt
@@ -2,5 +2,5 @@ x = {}
 l = ['hello', "world", 'goodbye']
 for (i, e) in enumerate(l):
     x[e] = i
-print x
+print(x)
 
diff --git a/v3/tests/backend-tests/namedtuple.golden b/v3/tests/backend-tests/namedtuple.golden
index eaf6c5775..4738235c9 100644
--- a/v3/tests/backend-tests/namedtuple.golden
+++ b/v3/tests/backend-tests/namedtuple.golden
@@ -27,7 +27,7 @@
       "heap": {
         "1": [
           "FUNCTION", 
-          "namedtuple(typename, field_names, verbose)", 
+          "namedtuple(typename, field_names, verbose, rename)", 
           null
         ]
       }, 
@@ -55,7 +55,7 @@
       "heap": {
         "1": [
           "FUNCTION", 
-          "namedtuple(typename, field_names, verbose)", 
+          "namedtuple(typename, field_names, verbose, rename)", 
           null
         ], 
         "2": [
@@ -175,7 +175,7 @@
         ], 
         "7": [
           "FUNCTION", 
-          "_asdict(t)", 
+          "_asdict(self)", 
           null
         ], 
         "8": [
@@ -245,7 +245,7 @@
       "heap": {
         "1": [
           "FUNCTION", 
-          "namedtuple(typename, field_names, verbose)", 
+          "namedtuple(typename, field_names, verbose, rename)", 
           null
         ], 
         "2": [
@@ -365,7 +365,7 @@
         ], 
         "7": [
           "FUNCTION", 
-          "_asdict(t)", 
+          "_asdict(self)", 
           null
         ], 
         "8": [
@@ -407,7 +407,27 @@
         ], 
         "16": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Escargots"
+          ], 
+          [
+            "name", 
+            "Taillevent"
+          ], 
+          [
+            "phone", 
+            "343-3434"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
         ]
       }, 
       "line": 6, 
@@ -444,7 +464,7 @@
       "heap": {
         "1": [
           "FUNCTION", 
-          "namedtuple(typename, field_names, verbose)", 
+          "namedtuple(typename, field_names, verbose, rename)", 
           null
         ], 
         "2": [
@@ -564,7 +584,7 @@
         ], 
         "7": [
           "FUNCTION", 
-          "_asdict(t)", 
+          "_asdict(self)", 
           null
         ], 
         "8": [
@@ -606,11 +626,51 @@
         ], 
         "16": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Escargots"
+          ], 
+          [
+            "name", 
+            "Taillevent"
+          ], 
+          [
+            "phone", 
+            "343-3434"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
         ], 
         "17": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Ris de Veau"
+          ], 
+          [
+            "name", 
+            "La Tour D'Argent"
+          ], 
+          [
+            "phone", 
+            "343-3344"
+          ], 
+          [
+            "price", 
+            48.500
+          ]
         ]
       }, 
       "line": 7, 
@@ -652,7 +712,7 @@
       "heap": {
         "1": [
           "FUNCTION", 
-          "namedtuple(typename, field_names, verbose)", 
+          "namedtuple(typename, field_names, verbose, rename)", 
           null
         ], 
         "2": [
@@ -772,7 +832,7 @@
         ], 
         "7": [
           "FUNCTION", 
-          "_asdict(t)", 
+          "_asdict(self)", 
           null
         ], 
         "8": [
@@ -814,15 +874,75 @@
         ], 
         "16": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Escargots"
+          ], 
+          [
+            "name", 
+            "Taillevent"
+          ], 
+          [
+            "phone", 
+            "343-3434"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
         ], 
         "17": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Ris de Veau"
+          ], 
+          [
+            "name", 
+            "La Tour D'Argent"
+          ], 
+          [
+            "phone", 
+            "343-3344"
+          ], 
+          [
+            "price", 
+            48.500
+          ]
         ], 
         "18": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Bouillabaisse"
+          ], 
+          [
+            "name", 
+            "Pascal"
+          ], 
+          [
+            "phone", 
+            "333-4444"
+          ], 
+          [
+            "price", 
+            32.000
+          ]
         ]
       }, 
       "line": 8, 
@@ -869,7 +989,7 @@
       "heap": {
         "1": [
           "FUNCTION", 
-          "namedtuple(typename, field_names, verbose)", 
+          "namedtuple(typename, field_names, verbose, rename)", 
           null
         ], 
         "2": [
@@ -989,7 +1109,7 @@
         ], 
         "7": [
           "FUNCTION", 
-          "_asdict(t)", 
+          "_asdict(self)", 
           null
         ], 
         "8": [
@@ -1031,19 +1151,99 @@
         ], 
         "16": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Escargots"
+          ], 
+          [
+            "name", 
+            "Taillevent"
+          ], 
+          [
+            "phone", 
+            "343-3434"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
         ], 
         "17": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Ris de Veau"
+          ], 
+          [
+            "name", 
+            "La Tour D'Argent"
+          ], 
+          [
+            "phone", 
+            "343-3344"
+          ], 
+          [
+            "price", 
+            48.500
+          ]
         ], 
         "18": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Bouillabaisse"
+          ], 
+          [
+            "name", 
+            "Pascal"
+          ], 
+          [
+            "phone", 
+            "333-4444"
+          ], 
+          [
+            "price", 
+            32.000
+          ]
         ], 
         "19": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mee Krob"
+          ], 
+          [
+            "name", 
+            "Thai Touch"
+          ], 
+          [
+            "phone", 
+            "444-3333"
+          ], 
+          [
+            "price", 
+            10.950
+          ]
         ]
       }, 
       "line": 9, 
@@ -1095,7 +1295,7 @@
       "heap": {
         "1": [
           "FUNCTION", 
-          "namedtuple(typename, field_names, verbose)", 
+          "namedtuple(typename, field_names, verbose, rename)", 
           null
         ], 
         "2": [
@@ -1215,7 +1415,7 @@
         ], 
         "7": [
           "FUNCTION", 
-          "_asdict(t)", 
+          "_asdict(self)", 
           null
         ], 
         "8": [
@@ -1257,23 +1457,123 @@
         ], 
         "16": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Escargots"
+          ], 
+          [
+            "name", 
+            "Taillevent"
+          ], 
+          [
+            "phone", 
+            "343-3434"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
         ], 
         "17": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Ris de Veau"
+          ], 
+          [
+            "name", 
+            "La Tour D'Argent"
+          ], 
+          [
+            "phone", 
+            "343-3344"
+          ], 
+          [
+            "price", 
+            48.500
+          ]
         ], 
         "18": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Bouillabaisse"
+          ], 
+          [
+            "name", 
+            "Pascal"
+          ], 
+          [
+            "phone", 
+            "333-4444"
+          ], 
+          [
+            "price", 
+            32.000
+          ]
         ], 
         "19": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mee Krob"
+          ], 
+          [
+            "name", 
+            "Thai Touch"
+          ], 
+          [
+            "phone", 
+            "444-3333"
+          ], 
+          [
+            "price", 
+            10.950
+          ]
         ], 
         "20": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Paht Woon Sen"
+          ], 
+          [
+            "name", 
+            "Thai Dishes"
+          ], 
+          [
+            "phone", 
+            "333-4433"
+          ], 
+          [
+            "price", 
+            8.500
+          ]
         ]
       }, 
       "line": 10, 
@@ -1330,7 +1630,7 @@
       "heap": {
         "1": [
           "FUNCTION", 
-          "namedtuple(typename, field_names, verbose)", 
+          "namedtuple(typename, field_names, verbose, rename)", 
           null
         ], 
         "2": [
@@ -1450,7 +1750,7 @@
         ], 
         "7": [
           "FUNCTION", 
-          "_asdict(t)", 
+          "_asdict(self)", 
           null
         ], 
         "8": [
@@ -1492,27 +1792,147 @@
         ], 
         "16": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Escargots"
+          ], 
+          [
+            "name", 
+            "Taillevent"
+          ], 
+          [
+            "phone", 
+            "343-3434"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
         ], 
         "17": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Ris de Veau"
+          ], 
+          [
+            "name", 
+            "La Tour D'Argent"
+          ], 
+          [
+            "phone", 
+            "343-3344"
+          ], 
+          [
+            "price", 
+            48.500
+          ]
         ], 
         "18": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Bouillabaisse"
+          ], 
+          [
+            "name", 
+            "Pascal"
+          ], 
+          [
+            "phone", 
+            "333-4444"
+          ], 
+          [
+            "price", 
+            32.000
+          ]
         ], 
         "19": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mee Krob"
+          ], 
+          [
+            "name", 
+            "Thai Touch"
+          ], 
+          [
+            "phone", 
+            "444-3333"
+          ], 
+          [
+            "price", 
+            10.950
+          ]
         ], 
         "20": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Paht Woon Sen"
+          ], 
+          [
+            "name", 
+            "Thai Dishes"
+          ], 
+          [
+            "phone", 
+            "333-4433"
+          ], 
+          [
+            "price", 
+            8.500
+          ]
         ], 
         "21": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mussamun"
+          ], 
+          [
+            "name", 
+            "Thai Spoon"
+          ], 
+          [
+            "phone", 
+            "334-3344"
+          ], 
+          [
+            "price", 
+            9.000
+          ]
         ]
       }, 
       "line": 11, 
@@ -1574,7 +1994,7 @@
       "heap": {
         "1": [
           "FUNCTION", 
-          "namedtuple(typename, field_names, verbose)", 
+          "namedtuple(typename, field_names, verbose, rename)", 
           null
         ], 
         "2": [
@@ -1694,7 +2114,7 @@
         ], 
         "7": [
           "FUNCTION", 
-          "_asdict(t)", 
+          "_asdict(self)", 
           null
         ], 
         "8": [
@@ -1736,31 +2156,171 @@
         ], 
         "16": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Escargots"
+          ], 
+          [
+            "name", 
+            "Taillevent"
+          ], 
+          [
+            "phone", 
+            "343-3434"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
         ], 
         "17": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Ris de Veau"
+          ], 
+          [
+            "name", 
+            "La Tour D'Argent"
+          ], 
+          [
+            "phone", 
+            "343-3344"
+          ], 
+          [
+            "price", 
+            48.500
+          ]
         ], 
         "18": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Bouillabaisse"
+          ], 
+          [
+            "name", 
+            "Pascal"
+          ], 
+          [
+            "phone", 
+            "333-4444"
+          ], 
+          [
+            "price", 
+            32.000
+          ]
         ], 
         "19": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mee Krob"
+          ], 
+          [
+            "name", 
+            "Thai Touch"
+          ], 
+          [
+            "phone", 
+            "444-3333"
+          ], 
+          [
+            "price", 
+            10.950
+          ]
         ], 
         "20": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Paht Woon Sen"
+          ], 
+          [
+            "name", 
+            "Thai Dishes"
+          ], 
+          [
+            "phone", 
+            "333-4433"
+          ], 
+          [
+            "price", 
+            8.500
+          ]
         ], 
         "21": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mussamun"
+          ], 
+          [
+            "name", 
+            "Thai Spoon"
+          ], 
+          [
+            "phone", 
+            "334-3344"
+          ], 
+          [
+            "price", 
+            9.000
+          ]
         ], 
         "22": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Burgers"
+          ], 
+          [
+            "dish", 
+            "Big Mac"
+          ], 
+          [
+            "name", 
+            "McDonald's"
+          ], 
+          [
+            "phone", 
+            "333-4443"
+          ], 
+          [
+            "price", 
+            3.950
+          ]
         ]
       }, 
       "line": 12, 
@@ -1827,7 +2387,7 @@
       "heap": {
         "1": [
           "FUNCTION", 
-          "namedtuple(typename, field_names, verbose)", 
+          "namedtuple(typename, field_names, verbose, rename)", 
           null
         ], 
         "2": [
@@ -1947,7 +2507,7 @@
         ], 
         "7": [
           "FUNCTION", 
-          "_asdict(t)", 
+          "_asdict(self)", 
           null
         ], 
         "8": [
@@ -1989,35 +2549,195 @@
         ], 
         "16": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Escargots"
+          ], 
+          [
+            "name", 
+            "Taillevent"
+          ], 
+          [
+            "phone", 
+            "343-3434"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
         ], 
         "17": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Ris de Veau"
+          ], 
+          [
+            "name", 
+            "La Tour D'Argent"
+          ], 
+          [
+            "phone", 
+            "343-3344"
+          ], 
+          [
+            "price", 
+            48.500
+          ]
         ], 
         "18": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Bouillabaisse"
+          ], 
+          [
+            "name", 
+            "Pascal"
+          ], 
+          [
+            "phone", 
+            "333-4444"
+          ], 
+          [
+            "price", 
+            32.000
+          ]
         ], 
         "19": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mee Krob"
+          ], 
+          [
+            "name", 
+            "Thai Touch"
+          ], 
+          [
+            "phone", 
+            "444-3333"
+          ], 
+          [
+            "price", 
+            10.950
+          ]
         ], 
         "20": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Paht Woon Sen"
+          ], 
+          [
+            "name", 
+            "Thai Dishes"
+          ], 
+          [
+            "phone", 
+            "333-4433"
+          ], 
+          [
+            "price", 
+            8.500
+          ]
         ], 
         "21": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mussamun"
+          ], 
+          [
+            "name", 
+            "Thai Spoon"
+          ], 
+          [
+            "phone", 
+            "334-3344"
+          ], 
+          [
+            "price", 
+            9.000
+          ]
         ], 
         "22": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Burgers"
+          ], 
+          [
+            "dish", 
+            "Big Mac"
+          ], 
+          [
+            "name", 
+            "McDonald's"
+          ], 
+          [
+            "phone", 
+            "333-4443"
+          ], 
+          [
+            "price", 
+            3.950
+          ]
         ], 
         "23": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Burgers"
+          ], 
+          [
+            "dish", 
+            "Whopper"
+          ], 
+          [
+            "name", 
+            "Burger King"
+          ], 
+          [
+            "phone", 
+            "444-3344"
+          ], 
+          [
+            "price", 
+            3.750
+          ]
         ]
       }, 
       "line": 13, 
@@ -2089,7 +2809,7 @@
       "heap": {
         "1": [
           "FUNCTION", 
-          "namedtuple(typename, field_names, verbose)", 
+          "namedtuple(typename, field_names, verbose, rename)", 
           null
         ], 
         "2": [
@@ -2209,7 +2929,7 @@
         ], 
         "7": [
           "FUNCTION", 
-          "_asdict(t)", 
+          "_asdict(self)", 
           null
         ], 
         "8": [
@@ -2251,39 +2971,219 @@
         ], 
         "16": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Escargots"
+          ], 
+          [
+            "name", 
+            "Taillevent"
+          ], 
+          [
+            "phone", 
+            "343-3434"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
         ], 
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+          [
+            "dish", 
+            "Mee Krob"
+          ], 
+          [
+            "name", 
+            "Thai Touch"
+          ], 
+          [
+            "phone", 
+            "444-3333"
+          ], 
+          [
+            "price", 
+            10.950
+          ]
         ], 
         "20": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Paht Woon Sen"
+          ], 
+          [
+            "name", 
+            "Thai Dishes"
+          ], 
+          [
+            "phone", 
+            "333-4433"
+          ], 
+          [
+            "price", 
+            8.500
+          ]
         ], 
         "21": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mussamun"
+          ], 
+          [
+            "name", 
+            "Thai Spoon"
+          ], 
+          [
+            "phone", 
+            "334-3344"
+          ], 
+          [
+            "price", 
+            9.000
+          ]
         ], 
         "22": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Burgers"
+          ], 
+          [
+            "dish", 
+            "Big Mac"
+          ], 
+          [
+            "name", 
+            "McDonald's"
+          ], 
+          [
+            "phone", 
+            "333-4443"
+          ], 
+          [
+            "price", 
+            3.950
+          ]
         ], 
         "23": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Burgers"
+          ], 
+          [
+            "dish", 
+            "Whopper"
+          ], 
+          [
+            "name", 
+            "Burger King"
+          ], 
+          [
+            "phone", 
+            "444-3344"
+          ], 
+          [
+            "price", 
+            3.750
+          ]
         ], 
         "24": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Fish Tacos"
+          ], 
+          [
+            "dish", 
+            "Mahi Mahi Burrito"
+          ], 
+          [
+            "name", 
+            "Wahoo's"
+          ], 
+          [
+            "phone", 
+            "443-4443"
+          ], 
+          [
+            "price", 
+            7.500
+          ]
         ], 
         "25": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Burgers"
+          ], 
+          [
+            "dish", 
+            "Cheeseburger"
+          ], 
+          [
+            "name", 
+            "In-N-Out Burger"
+          ], 
+          [
+            "phone", 
+            "434-3344"
+          ], 
+          [
+            "price", 
+            2.500
+          ]
         ], 
         "26": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Burgers"
+          ], 
+          [
+            "dish", 
+            "Hot Link Burger"
+          ], 
+          [
+            "name", 
+            "The Shack"
+          ], 
+          [
+            "phone", 
+            "333-3334"
+          ], 
+          [
+            "price", 
+            4.500
+          ]
         ], 
         "27": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Pizza"
+          ], 
+          [
+            "dish", 
+            "Combo Pizza"
+          ], 
+          [
+            "name", 
+            "Gina's"
+          ], 
+          [
+            "phone", 
+            "334-4433"
+          ], 
+          [
+            "price", 
+            12.950
+          ]
         ], 
         "28": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Indian"
+          ], 
+          [
+            "dish", 
+            "Rogan Josh"
+          ], 
+          [
+            "name", 
+            "Peacock, Room"
+          ], 
+          [
+            "phone", 
+            "333-4443"
+          ], 
+          [
+            "price", 
+            12.500
+          ]
         ], 
         "29": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Indian"
+          ], 
+          [
+            "dish", 
+            "Tandoori Chicken"
+          ], 
+          [
+            "name", 
+            "Gaylord"
+          ], 
+          [
+            "phone", 
+            "333-3433"
+          ], 
+          [
+            "price", 
+            13.500
+          ]
         ], 
         "30": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Chinese"
+          ], 
+          [
+            "dish", 
+            "Peking Duck"
+          ], 
+          [
+            "name", 
+            "Mr. Chow"
+          ], 
+          [
+            "phone", 
+            "222-3333"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
         ], 
         "31": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "California"
+          ], 
+          [
+            "dish", 
+            "Grilled Duck Breast"
+          ], 
+          [
+            "name", 
+            "Chez Panisse"
+          ], 
+          [
+            "phone", 
+            "222-3322"
+          ], 
+          [
+            "price", 
+            25.000
+          ]
         ], 
         "32": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "California"
+          ], 
+          [
+            "dish", 
+            "Striped Bass"
+          ], 
+          [
+            "name", 
+            "Spago"
+          ], 
+          [
+            "phone", 
+            "333-2222"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
         ], 
         "33": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Seafood"
+          ], 
+          [
+            "dish", 
+            "Cedar Plank Salmon"
+          ], 
+          [
+            "name", 
+            "Sriped Bass"
+          ], 
+          [
+            "phone", 
+            "333-2233"
+          ], 
+          [
+            "price", 
+            21.500
+          ]
         ], 
         "34": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Chinese"
+          ], 
+          [
+            "dish", 
+            "Egg Foo Young"
+          ], 
+          [
+            "name", 
+            "Golden Pagoda"
+          ], 
+          [
+            "phone", 
+            "232-3232"
+          ], 
+          [
+            "price", 
+            8.500
+          ]
         ]
       }, 
       "line": 24, 
@@ -5565,7 +9365,7 @@
       "heap": {
         "1": [
           "FUNCTION", 
-          "namedtuple(typename, field_names, verbose)", 
+          "namedtuple(typename, field_names, verbose, rename)", 
           null
         ], 
         "2": [
@@ -5685,7 +9485,7 @@
         ], 
         "7": [
           "FUNCTION", 
-          "_asdict(t)", 
+          "_asdict(self)", 
           null
         ], 
         "8": [
@@ -5727,83 +9527,483 @@
         ], 
         "16": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Escargots"
+          ], 
+          [
+            "name", 
+            "Taillevent"
+          ], 
+          [
+            "phone", 
+            "343-3434"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
         ], 
         "17": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Ris de Veau"
+          ], 
+          [
+            "name", 
+            "La Tour D'Argent"
+          ], 
+          [
+            "phone", 
+            "343-3344"
+          ], 
+          [
+            "price", 
+            48.500
+          ]
         ], 
         "18": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Bouillabaisse"
+          ], 
+          [
+            "name", 
+            "Pascal"
+          ], 
+          [
+            "phone", 
+            "333-4444"
+          ], 
+          [
+            "price", 
+            32.000
+          ]
         ], 
         "19": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mee Krob"
+          ], 
+          [
+            "name", 
+            "Thai Touch"
+          ], 
+          [
+            "phone", 
+            "444-3333"
+          ], 
+          [
+            "price", 
+            10.950
+          ]
         ], 
         "20": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Paht Woon Sen"
+          ], 
+          [
+            "name", 
+            "Thai Dishes"
+          ], 
+          [
+            "phone", 
+            "333-4433"
+          ], 
+          [
+            "price", 
+            8.500
+          ]
         ], 
         "21": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mussamun"
+          ], 
+          [
+            "name", 
+            "Thai Spoon"
+          ], 
+          [
+            "phone", 
+            "334-3344"
+          ], 
+          [
+            "price", 
+            9.000
+          ]
         ], 
         "22": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Burgers"
+          ], 
+          [
+            "dish", 
+            "Big Mac"
+          ], 
+          [
+            "name", 
+            "McDonald's"
+          ], 
+          [
+            "phone", 
+            "333-4443"
+          ], 
+          [
+            "price", 
+            3.950
+          ]
         ], 
         "23": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Burgers"
+          ], 
+          [
+            "dish", 
+            "Whopper"
+          ], 
+          [
+            "name", 
+            "Burger King"
+          ], 
+          [
+            "phone", 
+            "444-3344"
+          ], 
+          [
+            "price", 
+            3.750
+          ]
         ], 
         "24": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Fish Tacos"
+          ], 
+          [
+            "dish", 
+            "Mahi Mahi Burrito"
+          ], 
+          [
+            "name", 
+            "Wahoo's"
+          ], 
+          [
+            "phone", 
+            "443-4443"
+          ], 
+          [
+            "price", 
+            7.500
+          ]
         ], 
         "25": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Burgers"
+          ], 
+          [
+            "dish", 
+            "Cheeseburger"
+          ], 
+          [
+            "name", 
+            "In-N-Out Burger"
+          ], 
+          [
+            "phone", 
+            "434-3344"
+          ], 
+          [
+            "price", 
+            2.500
+          ]
         ], 
         "26": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Burgers"
+          ], 
+          [
+            "dish", 
+            "Hot Link Burger"
+          ], 
+          [
+            "name", 
+            "The Shack"
+          ], 
+          [
+            "phone", 
+            "333-3334"
+          ], 
+          [
+            "price", 
+            4.500
+          ]
         ], 
         "27": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Pizza"
+          ], 
+          [
+            "dish", 
+            "Combo Pizza"
+          ], 
+          [
+            "name", 
+            "Gina's"
+          ], 
+          [
+            "phone", 
+            "334-4433"
+          ], 
+          [
+            "price", 
+            12.950
+          ]
         ], 
         "28": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Indian"
+          ], 
+          [
+            "dish", 
+            "Rogan Josh"
+          ], 
+          [
+            "name", 
+            "Peacock, Room"
+          ], 
+          [
+            "phone", 
+            "333-4443"
+          ], 
+          [
+            "price", 
+            12.500
+          ]
         ], 
         "29": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Indian"
+          ], 
+          [
+            "dish", 
+            "Tandoori Chicken"
+          ], 
+          [
+            "name", 
+            "Gaylord"
+          ], 
+          [
+            "phone", 
+            "333-3433"
+          ], 
+          [
+            "price", 
+            13.500
+          ]
         ], 
         "30": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Chinese"
+          ], 
+          [
+            "dish", 
+            "Peking Duck"
+          ], 
+          [
+            "name", 
+            "Mr. Chow"
+          ], 
+          [
+            "phone", 
+            "222-3333"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
         ], 
         "31": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "California"
+          ], 
+          [
+            "dish", 
+            "Grilled Duck Breast"
+          ], 
+          [
+            "name", 
+            "Chez Panisse"
+          ], 
+          [
+            "phone", 
+            "222-3322"
+          ], 
+          [
+            "price", 
+            25.000
+          ]
         ], 
         "32": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "California"
+          ], 
+          [
+            "dish", 
+            "Striped Bass"
+          ], 
+          [
+            "name", 
+            "Spago"
+          ], 
+          [
+            "phone", 
+            "333-2222"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
         ], 
         "33": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Seafood"
+          ], 
+          [
+            "dish", 
+            "Cedar Plank Salmon"
+          ], 
+          [
+            "name", 
+            "Sriped Bass"
+          ], 
+          [
+            "phone", 
+            "333-2233"
+          ], 
+          [
+            "price", 
+            21.500
+          ]
         ], 
         "34": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Chinese"
+          ], 
+          [
+            "dish", 
+            "Egg Foo Young"
+          ], 
+          [
+            "name", 
+            "Golden Pagoda"
+          ], 
+          [
+            "phone", 
+            "232-3232"
+          ], 
+          [
+            "price", 
+            8.500
+          ]
         ], 
         "35": [
           "INSTANCE", 
-          "Restaurant"
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Delicatessen"
+          ], 
+          [
+            "dish", 
+            "Pastrami Sandwich"
+          ], 
+          [
+            "name", 
+            "Langer's"
+          ], 
+          [
+            "phone", 
+            "333-2223"
+          ], 
+          [
+            "price", 
+            11.500
+          ]
         ]
       }, 
       "line": 24, 
diff --git a/v3/tests/backend-tests/newstyle_class.golden b/v3/tests/backend-tests/newstyle_class.golden
index f428115c5..06e9a6ac5 100644
--- a/v3/tests/backend-tests/newstyle_class.golden
+++ b/v3/tests/backend-tests/newstyle_class.golden
@@ -1,5 +1,5 @@
 {
-  "code": "class A(object):\n  bla = \"A\"\n  def __init__(self):\n    self.blb = \"B\"\n\n  def x(self):\n    self.bla = self.blb\n\na = A()\n\na.x()\n\nprint a.bla\nprint A.bla\n\n", 
+  "code": "class A(object):\n  bla = \"A\"\n  def __init__(self):\n    self.blb = \"B\"\n\n  def x(self):\n    self.bla = self.blb\n\na = A()\n\na.x()\n\nprint(a.bla)\nprint(A.bla)\n\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/newstyle_class.txt b/v3/tests/backend-tests/newstyle_class.txt
index 315cda7e3..bc5e5551a 100644
--- a/v3/tests/backend-tests/newstyle_class.txt
+++ b/v3/tests/backend-tests/newstyle_class.txt
@@ -10,6 +10,6 @@ a = A()
 
 a.x()
 
-print a.bla
-print A.bla
+print(a.bla)
+print(A.bla)
 
diff --git a/v3/tests/backend-tests/one_func.golden b/v3/tests/backend-tests/one_func.golden
index fc82f73f5..ecd811f5c 100644
--- a/v3/tests/backend-tests/one_func.golden
+++ b/v3/tests/backend-tests/one_func.golden
@@ -1,5 +1,5 @@
 {
-  "code": "def add(a, b, c):\n  d = a + b\n  return c + d\n\nx = 5\ny = 10\nz = x * y\nprint add(x, y, z)\n", 
+  "code": "def add(a, b, c):\n  d = a + b\n  return c + d\n\nx = 5\ny = 10\nz = x * y\nprint(add(x, y, z))\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/one_func.txt b/v3/tests/backend-tests/one_func.txt
index ce141aa36..9ade23636 100644
--- a/v3/tests/backend-tests/one_func.txt
+++ b/v3/tests/backend-tests/one_func.txt
@@ -5,4 +5,4 @@ def add(a, b, c):
 x = 5
 y = 10
 z = x * y
-print add(x, y, z)
+print(add(x, y, z))
diff --git a/v3/tests/backend-tests/open_error.golden b/v3/tests/backend-tests/open_error.golden
index c9df6d16a..7f343f9c8 100644
--- a/v3/tests/backend-tests/open_error.golden
+++ b/v3/tests/backend-tests/open_error.golden
@@ -1,5 +1,5 @@
 {
-  "code": "for line in open(\"/etc/passwd\"):\n    print line\n\n", 
+  "code": "for line in open(\"/etc/passwd\"):\n    print(line)\n\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/open_error.txt b/v3/tests/backend-tests/open_error.txt
index 5f2bee2e7..a80454764 100644
--- a/v3/tests/backend-tests/open_error.txt
+++ b/v3/tests/backend-tests/open_error.txt
@@ -1,3 +1,3 @@
 for line in open("/etc/passwd"):
-    print line
+    print(line)
 
diff --git a/v3/tests/backend-tests/runtime_error.golden b/v3/tests/backend-tests/runtime_error.golden
index 59761ea5d..c26590156 100644
--- a/v3/tests/backend-tests/runtime_error.golden
+++ b/v3/tests/backend-tests/runtime_error.golden
@@ -1,5 +1,5 @@
 {
-  "code": "x = 5\nfor i in range(10):\n  if i == x:\n    z = x + y # ERROR!\n  else:\n    z = i\n  print z\n\n", 
+  "code": "x = 5\nfor i in range(10):\n  if i == x:\n    z = x + y # ERROR!\n  else:\n    z = i\n  print(z)\n\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/runtime_error.txt b/v3/tests/backend-tests/runtime_error.txt
index 57124a66e..d8be5bf4a 100644
--- a/v3/tests/backend-tests/runtime_error.txt
+++ b/v3/tests/backend-tests/runtime_error.txt
@@ -4,5 +4,5 @@ for i in range(10):
     z = x + y # ERROR!
   else:
     z = i
-  print z
+  print(z)
 
diff --git a/v3/tests/backend-tests/simple.golden b/v3/tests/backend-tests/simple.golden
index 2fc4b4ab8..c3f69caa6 100644
--- a/v3/tests/backend-tests/simple.golden
+++ b/v3/tests/backend-tests/simple.golden
@@ -1,5 +1,5 @@
 {
-  "code": "x = 5\ny = 10\nz = x * y\nprint \"HELLO WORLD\"\nfor i in range(10):\n  print z * i\n\n", 
+  "code": "x = 5\ny = 10\nz = x * y\nprint(\"HELLO WORLD\")\nfor i in range(10):\n  print(z * i)\n\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/simple.txt b/v3/tests/backend-tests/simple.txt
index 12b847786..8b7c08a7d 100644
--- a/v3/tests/backend-tests/simple.txt
+++ b/v3/tests/backend-tests/simple.txt
@@ -1,7 +1,7 @@
 x = 5
 y = 10
 z = x * y
-print "HELLO WORLD"
+print("HELLO WORLD")
 for i in range(10):
-  print z * i
+  print(z * i)
 
diff --git a/v3/tests/backend-tests/two_funcs.golden b/v3/tests/backend-tests/two_funcs.golden
index 9d15f9734..9a2a15184 100644
--- a/v3/tests/backend-tests/two_funcs.golden
+++ b/v3/tests/backend-tests/two_funcs.golden
@@ -1,5 +1,5 @@
 {
-  "code": "def add(a, b, c):\n  d = a + b\n  return c + d\n\ndef double_add(a, b, c):\n  x = add(a, b, c)\n  y = add(a, b, c)\n  return x + y\n\nx = 5\ny = 10\nz = x * y\nprint add(x, y, z)\nprint double_add(x, y, z)\n", 
+  "code": "def add(a, b, c):\n  d = a + b\n  return c + d\n\ndef double_add(a, b, c):\n  x = add(a, b, c)\n  y = add(a, b, c)\n  return x + y\n\nx = 5\ny = 10\nz = x * y\nprint(add(x, y, z))\nprint(double_add(x, y, z))\n", 
   "trace": [
     {
       "ordered_globals": [], 
diff --git a/v3/tests/backend-tests/two_funcs.txt b/v3/tests/backend-tests/two_funcs.txt
index 4a07fd3b9..32959fbd6 100644
--- a/v3/tests/backend-tests/two_funcs.txt
+++ b/v3/tests/backend-tests/two_funcs.txt
@@ -10,5 +10,5 @@ def double_add(a, b, c):
 x = 5
 y = 10
 z = x * y
-print add(x, y, z)
-print double_add(x, y, z)
+print(add(x, y, z))
+print(double_add(x, y, z))

From cca9ea38db87d20b10325d15c4ecc6c27727a644 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 22 Sep 2012 23:23:06 -0700
Subject: [PATCH 429/502] added *.golden_py3 files for Python 3 tests

---
 .gitignore                                    |     2 +
 v3/example-code/aliasing.golden_py3           |  2067 +++
 v3/example-code/aliasing/aliasing1.golden_py3 |    98 +
 v3/example-code/aliasing/aliasing2.golden_py3 |    90 +
 v3/example-code/aliasing/aliasing3.golden_py3 |   335 +
 v3/example-code/aliasing/aliasing4.golden_py3 |    67 +
 v3/example-code/aliasing/aliasing5.golden_py3 |   455 +
 v3/example-code/aliasing/aliasing6.golden_py3 |   327 +
 v3/example-code/aliasing/aliasing7.golden_py3 |   248 +
 v3/example-code/aliasing/aliasing8.golden_py3 |   229 +
 v3/example-code/closures/closure1.golden_py3  |   567 +
 v3/example-code/closures/closure2.golden_py3  |  1764 +++
 v3/example-code/closures/closure3.golden_py3  |  1400 ++
 v3/example-code/closures/closure4.golden_py3  |  1457 ++
 v3/example-code/closures/closure5.golden_py3  |  7684 ++++++++++
 .../closures/lambda-param.golden_py3          |   758 +
 v3/example-code/decorators.golden_py3         |  1892 +++
 v3/example-code/fact.golden_py3               |  1909 +++
 v3/example-code/fib.golden_py3                |  7560 ++++++++++
 v3/example-code/filter.golden_py3             |  1505 ++
 v3/example-code/for-else.golden_py3           |  1475 ++
 v3/example-code/gen_primes.golden_py3         | 12512 ++++++++++++++++
 v3/example-code/genexpr.golden_py3            |  2170 +++
 v3/example-code/happy.golden_py3              |   952 ++
 v3/example-code/ins_sort.golden_py3           |  3538 +++++
 v3/example-code/linked-lists/ll1.golden_py3   |  1977 +++
 v3/example-code/linked-lists/ll2.golden_py3   |  9885 ++++++++++++
 v3/example-code/list-comp.golden_py3          |   926 ++
 v3/example-code/map.golden_py3                |  6953 +++++++++
 v3/example-code/memo_fib.golden_py3           | 10715 +++++++++++++
 v3/example-code/nonlocal.golden_py3           |   667 +
 v3/example-code/oop_1.golden_py3              |  2428 +++
 v3/example-code/oop_2.golden_py3              |  2258 +++
 v3/example-code/oop_inherit.golden_py3        |  3159 ++++
 v3/example-code/oop_small.golden_py3          |  2087 +++
 v3/example-code/py_tutorial.golden_py3        |  4754 ++++++
 v3/example-code/sqrt.golden_py3               |  8929 +++++++++++
 v3/example-code/strtok.golden_py3             |   258 +
 v3/example-code/sum-cubes.golden_py3          |  1693 +++
 v3/example-code/sum-list.golden_py3           |  3466 +++++
 v3/example-code/sum.golden_py3                | 10163 +++++++++++++
 v3/example-code/towers_of_hanoi.golden_py3    | 10996 ++++++++++++++
 v3/example-code/varargs.golden_py3            |  1015 ++
 v3/example-code/wentworth_gcd.golden_py3      |  3798 +++++
 v3/example-code/wentworth_sumList.golden_py3  |  4520 ++++++
 .../wentworth_try_finally.golden_py3          |  2823 ++++
 .../caught_exception_1.golden_py3             |    66 +
 .../caught_exception_2.golden_py3             |    77 +
 v3/tests/backend-tests/circ_ref.golden_py3    |    65 +
 v3/tests/backend-tests/circ_ref_2.golden_py3  |   116 +
 .../backend-tests/circ_ref_fake.golden_py3    |   168 +
 v3/tests/backend-tests/class_test.golden_py3  |  2671 ++++
 .../backend-tests/class_test_2.golden_py3     |   297 +
 .../backend-tests/class_test_3.golden_py3     |   673 +
 .../closure-shadow-same-name.golden_py3       |   505 +
 v3/tests/backend-tests/data_test.golden_py3   |   213 +
 v3/tests/backend-tests/dict_error.golden_py3  |   207 +
 v3/tests/backend-tests/dict_test.golden_py3   |   730 +
 v3/tests/backend-tests/exec_test.golden_py3   |    26 +
 .../backend-tests/func_exception.golden_py3   |   270 +
 .../backend-tests/generator_test.golden_py3   |   100 +
 .../generator_use_test.golden_py3             | 10772 +++++++++++++
 .../backend-tests/import_error.golden_py3     |    29 +
 .../backend-tests/infinite_loop.golden_py3    |  7560 ++++++++++
 .../infinite_loop_one_liner.golden_py3        |  3009 ++++
 .../backend-tests/john-compose.golden_py3     |  1262 ++
 .../backend-tests/john-import-test.golden_py3 |   282 +
 v3/tests/backend-tests/lambda_1.golden_py3    |  5493 +++++++
 .../backend-tests/ling-scheme-1.golden_py3    |  4020 +++++
 .../backend-tests/ling-scheme-2.golden_py3    |  3788 +++++
 .../backend-tests/ling-scheme-3.golden_py3    |  8612 +++++++++++
 .../backend-tests/list_dict_test.golden_py3   |   416 +
 v3/tests/backend-tests/list_test.golden_py3   |    48 +
 v3/tests/backend-tests/namedtuple.golden_py3  | 10013 +++++++++++++
 .../backend-tests/newstyle_class.golden_py3   |  1631 ++
 v3/tests/backend-tests/one_func.golden_py3    |   350 +
 v3/tests/backend-tests/open_error.golden_py3  |    26 +
 .../backend-tests/parent-finding-1.golden_py3 |   483 +
 .../backend-tests/parent-finding-2.golden_py3 |   957 ++
 v3/tests/backend-tests/parse_error.golden_py3 |    11 +
 .../backend-tests/parse_error_2.golden_py3    |    11 +
 .../backend-tests/parse_error_3.golden_py3    |    11 +
 v3/tests/backend-tests/pie-test.golden_py3    |    91 +
 v3/tests/backend-tests/py-modules.golden_py3  |   132 +
 .../backend-tests/runtime_error.golden_py3    |   440 +
 v3/tests/backend-tests/set_test.golden_py3    |   151 +
 v3/tests/backend-tests/simple.golden_py3      |   501 +
 v3/tests/backend-tests/three_lists.golden_py3 |   632 +
 v3/tests/backend-tests/tuple_test.golden_py3  |    72 +
 v3/tests/backend-tests/two_funcs.golden_py3   |  1453 ++
 v3/tests/backend-tests/varargs.golden_py3     |   267 +
 91 files changed, 213238 insertions(+)
 create mode 100644 v3/example-code/aliasing.golden_py3
 create mode 100644 v3/example-code/aliasing/aliasing1.golden_py3
 create mode 100644 v3/example-code/aliasing/aliasing2.golden_py3
 create mode 100644 v3/example-code/aliasing/aliasing3.golden_py3
 create mode 100644 v3/example-code/aliasing/aliasing4.golden_py3
 create mode 100644 v3/example-code/aliasing/aliasing5.golden_py3
 create mode 100644 v3/example-code/aliasing/aliasing6.golden_py3
 create mode 100644 v3/example-code/aliasing/aliasing7.golden_py3
 create mode 100644 v3/example-code/aliasing/aliasing8.golden_py3
 create mode 100644 v3/example-code/closures/closure1.golden_py3
 create mode 100644 v3/example-code/closures/closure2.golden_py3
 create mode 100644 v3/example-code/closures/closure3.golden_py3
 create mode 100644 v3/example-code/closures/closure4.golden_py3
 create mode 100644 v3/example-code/closures/closure5.golden_py3
 create mode 100644 v3/example-code/closures/lambda-param.golden_py3
 create mode 100644 v3/example-code/decorators.golden_py3
 create mode 100644 v3/example-code/fact.golden_py3
 create mode 100644 v3/example-code/fib.golden_py3
 create mode 100644 v3/example-code/filter.golden_py3
 create mode 100644 v3/example-code/for-else.golden_py3
 create mode 100644 v3/example-code/gen_primes.golden_py3
 create mode 100644 v3/example-code/genexpr.golden_py3
 create mode 100644 v3/example-code/happy.golden_py3
 create mode 100644 v3/example-code/ins_sort.golden_py3
 create mode 100644 v3/example-code/linked-lists/ll1.golden_py3
 create mode 100644 v3/example-code/linked-lists/ll2.golden_py3
 create mode 100644 v3/example-code/list-comp.golden_py3
 create mode 100644 v3/example-code/map.golden_py3
 create mode 100644 v3/example-code/memo_fib.golden_py3
 create mode 100644 v3/example-code/nonlocal.golden_py3
 create mode 100644 v3/example-code/oop_1.golden_py3
 create mode 100644 v3/example-code/oop_2.golden_py3
 create mode 100644 v3/example-code/oop_inherit.golden_py3
 create mode 100644 v3/example-code/oop_small.golden_py3
 create mode 100644 v3/example-code/py_tutorial.golden_py3
 create mode 100644 v3/example-code/sqrt.golden_py3
 create mode 100644 v3/example-code/strtok.golden_py3
 create mode 100644 v3/example-code/sum-cubes.golden_py3
 create mode 100644 v3/example-code/sum-list.golden_py3
 create mode 100644 v3/example-code/sum.golden_py3
 create mode 100644 v3/example-code/towers_of_hanoi.golden_py3
 create mode 100644 v3/example-code/varargs.golden_py3
 create mode 100644 v3/example-code/wentworth_gcd.golden_py3
 create mode 100644 v3/example-code/wentworth_sumList.golden_py3
 create mode 100644 v3/example-code/wentworth_try_finally.golden_py3
 create mode 100644 v3/tests/backend-tests/caught_exception_1.golden_py3
 create mode 100644 v3/tests/backend-tests/caught_exception_2.golden_py3
 create mode 100644 v3/tests/backend-tests/circ_ref.golden_py3
 create mode 100644 v3/tests/backend-tests/circ_ref_2.golden_py3
 create mode 100644 v3/tests/backend-tests/circ_ref_fake.golden_py3
 create mode 100644 v3/tests/backend-tests/class_test.golden_py3
 create mode 100644 v3/tests/backend-tests/class_test_2.golden_py3
 create mode 100644 v3/tests/backend-tests/class_test_3.golden_py3
 create mode 100644 v3/tests/backend-tests/closure-shadow-same-name.golden_py3
 create mode 100644 v3/tests/backend-tests/data_test.golden_py3
 create mode 100644 v3/tests/backend-tests/dict_error.golden_py3
 create mode 100644 v3/tests/backend-tests/dict_test.golden_py3
 create mode 100644 v3/tests/backend-tests/exec_test.golden_py3
 create mode 100644 v3/tests/backend-tests/func_exception.golden_py3
 create mode 100644 v3/tests/backend-tests/generator_test.golden_py3
 create mode 100644 v3/tests/backend-tests/generator_use_test.golden_py3
 create mode 100644 v3/tests/backend-tests/import_error.golden_py3
 create mode 100644 v3/tests/backend-tests/infinite_loop.golden_py3
 create mode 100644 v3/tests/backend-tests/infinite_loop_one_liner.golden_py3
 create mode 100644 v3/tests/backend-tests/john-compose.golden_py3
 create mode 100644 v3/tests/backend-tests/john-import-test.golden_py3
 create mode 100644 v3/tests/backend-tests/lambda_1.golden_py3
 create mode 100644 v3/tests/backend-tests/ling-scheme-1.golden_py3
 create mode 100644 v3/tests/backend-tests/ling-scheme-2.golden_py3
 create mode 100644 v3/tests/backend-tests/ling-scheme-3.golden_py3
 create mode 100644 v3/tests/backend-tests/list_dict_test.golden_py3
 create mode 100644 v3/tests/backend-tests/list_test.golden_py3
 create mode 100644 v3/tests/backend-tests/namedtuple.golden_py3
 create mode 100644 v3/tests/backend-tests/newstyle_class.golden_py3
 create mode 100644 v3/tests/backend-tests/one_func.golden_py3
 create mode 100644 v3/tests/backend-tests/open_error.golden_py3
 create mode 100644 v3/tests/backend-tests/parent-finding-1.golden_py3
 create mode 100644 v3/tests/backend-tests/parent-finding-2.golden_py3
 create mode 100644 v3/tests/backend-tests/parse_error.golden_py3
 create mode 100644 v3/tests/backend-tests/parse_error_2.golden_py3
 create mode 100644 v3/tests/backend-tests/parse_error_3.golden_py3
 create mode 100644 v3/tests/backend-tests/pie-test.golden_py3
 create mode 100644 v3/tests/backend-tests/py-modules.golden_py3
 create mode 100644 v3/tests/backend-tests/runtime_error.golden_py3
 create mode 100644 v3/tests/backend-tests/set_test.golden_py3
 create mode 100644 v3/tests/backend-tests/simple.golden_py3
 create mode 100644 v3/tests/backend-tests/three_lists.golden_py3
 create mode 100644 v3/tests/backend-tests/tuple_test.golden_py3
 create mode 100644 v3/tests/backend-tests/two_funcs.golden_py3
 create mode 100644 v3/tests/backend-tests/varargs.golden_py3

diff --git a/.gitignore b/.gitignore
index 6f3ae28da..5182c9ada 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 *.out
+*.out_py3
 *.pyc
+*.pyo
diff --git a/v3/example-code/aliasing.golden_py3 b/v3/example-code/aliasing.golden_py3
new file mode 100644
index 000000000..f56be9792
--- /dev/null
+++ b/v3/example-code/aliasing.golden_py3
@@ -0,0 +1,2067 @@
+{
+  "code": "x = [1, 2, 3]\ny = [4, 5, 6]\nz = y\ny = x\nx = z\n\nx = [1, 2, 3] # a different [1, 2, 3] list!\ny = x\nx.append(4)\ny.append(5)\nz = [1, 2, 3, 4, 5] # a different list!\nx.append(6)\ny.append(7)\ny = \"hello\"\n\n\ndef foo(lst):\n    lst.append(\"hello\")\n    bar(lst)\n\ndef bar(myLst):\n    print(myLst)\n\nfoo(x)\nfoo(z)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2, 
+          3
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
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+        ]
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+      "heap": {
+        "1": [
+          "LIST", 
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+        "2": [
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+      "line": 3, 
+      "event": "step_line"
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diff --git a/v3/example-code/aliasing/aliasing1.golden_py3 b/v3/example-code/aliasing/aliasing1.golden_py3
new file mode 100644
index 000000000..00383dd48
--- /dev/null
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@@ -0,0 +1,98 @@
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diff --git a/v3/example-code/aliasing/aliasing2.golden_py3 b/v3/example-code/aliasing/aliasing2.golden_py3
new file mode 100644
index 000000000..ab6c203f4
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diff --git a/v3/example-code/aliasing/aliasing3.golden_py3 b/v3/example-code/aliasing/aliasing3.golden_py3
new file mode 100644
index 000000000..a0bded930
--- /dev/null
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+            "REF", 
+            1
+          ], 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "5": [
+          "TUPLE", 
+          1, 
+          2
+        ], 
+        "6": [
+          "TUPLE", 
+          3, 
+          4
+        ]
+      }, 
+      "line": 7, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/example-code/aliasing/aliasing4.golden_py3 b/v3/example-code/aliasing/aliasing4.golden_py3
new file mode 100644
index 000000000..0d440f81a
--- /dev/null
+++ b/v3/example-code/aliasing/aliasing4.golden_py3
@@ -0,0 +1,67 @@
+{
+  "code": "x = [1, 2, 3]\nx.append(x)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2, 
+          3
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2, 
+          3, 
+          [
+            "REF", 
+            1
+          ]
+        ]
+      }, 
+      "line": 2, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/example-code/aliasing/aliasing5.golden_py3 b/v3/example-code/aliasing/aliasing5.golden_py3
new file mode 100644
index 000000000..af82d0118
--- /dev/null
+++ b/v3/example-code/aliasing/aliasing5.golden_py3
@@ -0,0 +1,455 @@
+{
+  "code": "x = None\nfor i in range(5, 0, -1):\n  x = (i, x)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": null
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 5, 
+        "x": null
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 5, 
+        "x": [
+          "REF", 
+          1
+        ]
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+      "heap": {
+        "1": [
+          "TUPLE", 
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+        ]
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+      "event": "step_line"
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+        "x", 
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+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
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+      "stack_to_render": [], 
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+      "event": "step_line"
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+      "func_name": "", 
+      "stack_to_render": [], 
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+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "x": [
+          "REF", 
+          5
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "TUPLE", 
+          5, 
+          null
+        ], 
+        "2": [
+          "TUPLE", 
+          4, 
+          [
+            "REF", 
+            1
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          3, 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "5": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            4
+          ]
+        ]
+      }, 
+      "line": 2, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/example-code/aliasing/aliasing6.golden_py3 b/v3/example-code/aliasing/aliasing6.golden_py3
new file mode 100644
index 000000000..71b2ac9b6
--- /dev/null
+++ b/v3/example-code/aliasing/aliasing6.golden_py3
@@ -0,0 +1,327 @@
+{
+  "code": "# wow, this looks gross :)\nt1 = (1, 2)\nt2 = (3, 4)\nt = [t1, t2]\nu = [t, t, t]\nu[1] = u\nt[0] = u\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "t1"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "t1": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "TUPLE", 
+          1, 
+          2
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "t1", 
+        "t2"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "t2": [
+          "REF", 
+          2
+        ], 
+        "t1": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "TUPLE", 
+          1, 
+          2
+        ], 
+        "2": [
+          "TUPLE", 
+          3, 
+          4
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "t1", 
+        "t2", 
+        "t"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "t2": [
+          "REF", 
+          2
+        ], 
+        "t": [
+          "REF", 
+          3
+        ], 
+        "t1": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
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+          1, 
+          2
+        ], 
+        "2": [
+          "TUPLE", 
+          3, 
+          4
+        ], 
+        "3": [
+          "LIST", 
+          [
+            "REF", 
+            1
+          ], 
+          [
+            "REF", 
+            2
+          ]
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "t1", 
+        "t2", 
+        "t", 
+        "u"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "t2": [
+          "REF", 
+          2
+        ], 
+        "u": [
+          "REF", 
+          4
+        ], 
+        "t": [
+          "REF", 
+          3
+        ], 
+        "t1": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
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+          1, 
+          2
+        ], 
+        "2": [
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+          4
+        ], 
+        "3": [
+          "LIST", 
+          [
+            "REF", 
+            1
+          ], 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "4": [
+          "LIST", 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            3
+          ]
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "t1", 
+        "t2", 
+        "t", 
+        "u"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "t2": [
+          "REF", 
+          2
+        ], 
+        "u": [
+          "REF", 
+          4
+        ], 
+        "t": [
+          "REF", 
+          3
+        ], 
+        "t1": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
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+          1, 
+          2
+        ], 
+        "2": [
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+          4
+        ], 
+        "3": [
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+          [
+            "REF", 
+            1
+          ], 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "4": [
+          "LIST", 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            3
+          ]
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "t1", 
+        "t2", 
+        "t", 
+        "u"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "t2": [
+          "REF", 
+          2
+        ], 
+        "u": [
+          "REF", 
+          4
+        ], 
+        "t": [
+          "REF", 
+          3
+        ], 
+        "t1": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "TUPLE", 
+          1, 
+          2
+        ], 
+        "2": [
+          "TUPLE", 
+          3, 
+          4
+        ], 
+        "3": [
+          "LIST", 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "4": [
+          "LIST", 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            3
+          ]
+        ]
+      }, 
+      "line": 7, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/example-code/aliasing/aliasing7.golden_py3 b/v3/example-code/aliasing/aliasing7.golden_py3
new file mode 100644
index 000000000..fc49379b4
--- /dev/null
+++ b/v3/example-code/aliasing/aliasing7.golden_py3
@@ -0,0 +1,248 @@
+{
+  "code": "x = (3, {'joe': 'M', 'jane': 'F'})\ny = (2, x)\nz = (1, y)\nw = (x, y, z)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "TUPLE", 
+          3, 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "jane", 
+            "F"
+          ], 
+          [
+            "joe", 
+            "M"
+          ]
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          3
+        ], 
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "TUPLE", 
+          3, 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "jane", 
+            "F"
+          ], 
+          [
+            "joe", 
+            "M"
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            1
+          ]
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
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+        "2": [
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+          ]
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+      "stack_to_render": [], 
+      "globals": {
+        "y": [
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+        ], 
+        "x": [
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+        ], 
+        "z": [
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+        "w": [
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+        "2": [
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+          [
+            "jane", 
+            "F"
+          ], 
+          [
+            "joe", 
+            "M"
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            1
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "5": [
+          "TUPLE", 
+          [
+            "REF", 
+            1
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ]
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/example-code/aliasing/aliasing8.golden_py3 b/v3/example-code/aliasing/aliasing8.golden_py3
new file mode 100644
index 000000000..20ddeb5fb
--- /dev/null
+++ b/v3/example-code/aliasing/aliasing8.golden_py3
@@ -0,0 +1,229 @@
+{
+  "code": "# test whether heap objects \"jiggle\" between steps\nx = [1, [2, [3, None]]]\ny = [4, [5, [6, None]]]\n\nx[1][1] = y[1] # hopefully no jiggle!\n\nx = set(['apple', 'banana', 'carrot'])\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          2, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "3": [
+          "LIST", 
+          3, 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          4
+        ], 
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          2, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "3": [
+          "LIST", 
+          3, 
+          null
+        ], 
+        "4": [
+          "LIST", 
+          4, 
+          [
+            "REF", 
+            5
+          ]
+        ], 
+        "5": [
+          "LIST", 
+          5, 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "6": [
+          "LIST", 
+          6, 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          4
+        ], 
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          2, 
+          [
+            "REF", 
+            5
+          ]
+        ], 
+        "4": [
+          "LIST", 
+          4, 
+          [
+            "REF", 
+            5
+          ]
+        ], 
+        "5": [
+          "LIST", 
+          5, 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "6": [
+          "LIST", 
+          6, 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          4
+        ], 
+        "x": [
+          "REF", 
+          7
+        ]
+      }, 
+      "heap": {
+        "4": [
+          "LIST", 
+          4, 
+          [
+            "REF", 
+            5
+          ]
+        ], 
+        "5": [
+          "LIST", 
+          5, 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "6": [
+          "LIST", 
+          6, 
+          null
+        ], 
+        "7": [
+          "SET", 
+          "carrot", 
+          "apple", 
+          "banana"
+        ]
+      }, 
+      "line": 7, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/example-code/closures/closure1.golden_py3 b/v3/example-code/closures/closure1.golden_py3
new file mode 100644
index 000000000..60defd48b
--- /dev/null
+++ b/v3/example-code/closures/closure1.golden_py3
@@ -0,0 +1,567 @@
+{
+  "code": "def foo(y):\n    def bar(x):\n        return x + y\n    return bar\n\nb = foo(1)\nb(2)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1, 
+            "bar": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1_p", 
+          "ordered_varnames": [
+            "y", 
+            "bar"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "bar(x)", 
+          1
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1, 
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "bar": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1_p", 
+          "ordered_varnames": [
+            "y", 
+            "bar", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "bar(x)", 
+          1
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "foo", 
+        "b"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1, 
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "bar": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "foo", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1_p_z", 
+          "ordered_varnames": [
+            "y", 
+            "bar", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ], 
+        "b": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "bar(x)", 
+          1
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo", 
+        "b"
+      ], 
+      "stdout": "", 
+      "func_name": "bar", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1, 
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "bar": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "foo", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1_p_z", 
+          "ordered_varnames": [
+            "y", 
+            "bar", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 2
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "bar", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "bar_f2", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ], 
+        "b": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "bar(x)", 
+          1
+        ]
+      }, 
+      "line": 2, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "foo", 
+        "b"
+      ], 
+      "stdout": "", 
+      "func_name": "bar", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1, 
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "bar": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "foo", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1_p_z", 
+          "ordered_varnames": [
+            "y", 
+            "bar", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 2
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "bar", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "bar_f2", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ], 
+        "b": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "bar(x)", 
+          1
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo", 
+        "b"
+      ], 
+      "stdout": "", 
+      "func_name": "bar", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1, 
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "bar": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "foo", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1_p_z", 
+          "ordered_varnames": [
+            "y", 
+            "bar", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": 3, 
+            "x": 2
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "bar", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "bar_f2", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ], 
+        "b": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "bar(x)", 
+          1
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "foo", 
+        "b"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1, 
+            "__return__": [
+              "REF", 
+              2
+            ], 
+            "bar": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "foo", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1_p_z", 
+          "ordered_varnames": [
+            "y", 
+            "bar", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "b": [
+          "REF", 
+          2
+        ], 
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "bar(x)", 
+          1
+        ]
+      }, 
+      "line": 7, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/example-code/closures/closure2.golden_py3 b/v3/example-code/closures/closure2.golden_py3
new file mode 100644
index 000000000..57084967a
--- /dev/null
+++ b/v3/example-code/closures/closure2.golden_py3
@@ -0,0 +1,1764 @@
+{
+  "code": "def foo(y):\n    def bar(x):\n        return x + y\n    return bar\n\ndef foo_deux(y):\n    def bar_deux(x):\n        return x + y\n    return bar_deux\n\nb = foo(1)\nb_deux = foo_deux(1000)\n\nb(2)    \nb_deux(2000)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo", 
+        "foo_deux"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ], 
+        "foo_deux": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "foo_deux(y)", 
+          null
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo", 
+        "foo_deux"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ], 
+        "foo_deux": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "foo_deux(y)", 
+          null
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "foo", 
+        "foo_deux"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ], 
+        "foo_deux": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo(y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "foo_deux(y)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "foo", 
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+}
diff --git a/v3/example-code/closures/closure3.golden_py3 b/v3/example-code/closures/closure3.golden_py3
new file mode 100644
index 000000000..7a968114d
--- /dev/null
+++ b/v3/example-code/closures/closure3.golden_py3
@@ -0,0 +1,1400 @@
+{
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diff --git a/v3/example-code/closures/closure4.golden_py3 b/v3/example-code/closures/closure4.golden_py3
new file mode 100644
index 000000000..d26bb55af
--- /dev/null
+++ b/v3/example-code/closures/closure4.golden_py3
@@ -0,0 +1,1457 @@
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diff --git a/v3/example-code/closures/closure5.golden_py3 b/v3/example-code/closures/closure5.golden_py3
new file mode 100644
index 000000000..3251000b6
--- /dev/null
+++ b/v3/example-code/closures/closure5.golden_py3
@@ -0,0 +1,7684 @@
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+  ]
+}
diff --git a/v3/example-code/closures/lambda-param.golden_py3 b/v3/example-code/closures/lambda-param.golden_py3
new file mode 100644
index 000000000..981686dd2
--- /dev/null
+++ b/v3/example-code/closures/lambda-param.golden_py3
@@ -0,0 +1,758 @@
+{
+  "code": "def foo(x):\n  bar(lambda y: x + y)\n\ndef bar(a):\n  print(a(20))\n\nfoo(10)\n", 
+  "trace": [
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+      "stdout": "", 
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+      "globals": {}, 
+      "heap": {}, 
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+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
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+      "event": "step_line"
+    }, 
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+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
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+        ], 
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+      }, 
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+      "event": "call"
+    }, 
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+        "foo", 
+        "bar"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
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+          "frame_id": 1, 
+          "encoded_locals": {
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+          }, 
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+        ], 
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+      "event": "call"
+    }, 
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+        "foo", 
+        "bar"
+      ], 
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+      "func_name": "bar", 
+      "stack_to_render": [
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+      }, 
+      "line": 5, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "foo", 
+        "bar"
+      ], 
+      "stdout": "30\n", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
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+          "unique_hash": "foo_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
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+          1
+        ], 
+        "bar": [
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+          2
+        ]
+      }, 
+      "heap": {
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+        ], 
+        "2": [
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+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "foo", 
+        "bar"
+      ], 
+      "stdout": "30\n", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": null, 
+            "x": 10
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "foo", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1_p_z", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ], 
+        "bar": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
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+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "bar(a)", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/example-code/decorators.golden_py3 b/v3/example-code/decorators.golden_py3
new file mode 100644
index 000000000..67355fc21
--- /dev/null
+++ b/v3/example-code/decorators.golden_py3
@@ -0,0 +1,1892 @@
+{
+  "code": "def make_bold(fn):\n    return lambda : \"\" + fn() + \"\"\n\ndef make_italic(fn):\n    return lambda : \"\" + fn() + \"\"\n\n@make_bold\n@make_italic\ndef hello():\n  return \"hello world\"\n  \nhelloHTML = hello()\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "make_bold"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "make_bold": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "make_bold(fn)", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "make_bold", 
+        "make_italic"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "make_bold": [
+          "REF", 
+          1
+        ], 
+        "make_italic": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "make_bold(fn)", 
+          null
+        ], 
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diff --git a/v3/example-code/fact.golden_py3 b/v3/example-code/fact.golden_py3
new file mode 100644
index 000000000..6f756d707
--- /dev/null
+++ b/v3/example-code/fact.golden_py3
@@ -0,0 +1,1909 @@
+{
+  "code": "# dumb recursive factorial\ndef fact(n):\n    if (n <= 1):\n        return 1\n    else:\n        return n * fact(n - 1)\n\nprint(fact(6))\n", 
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+}
diff --git a/v3/example-code/fib.golden_py3 b/v3/example-code/fib.golden_py3
new file mode 100644
index 000000000..55c3b980b
--- /dev/null
+++ b/v3/example-code/fib.golden_py3
@@ -0,0 +1,7560 @@
+{
+  "code": "# Infinite Fibonacci!!!\n\narr = [1, 1]\n\nprint(arr[0])\n\nwhile True:\n    print(arr[-1])\n    tmp = sum(arr)\n    arr.append(tmp)\n    del arr[0]\n", 
+  "trace": [
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+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n2\n3\n5\n8\n13\n21\n34\n55\n89\n144\n233\n377\n610\n987\n1597\n2584\n4181\n6765\n10946\n17711\n28657\n46368\n75025\n121393\n196418\n317811\n514229\n832040\n1346269\n2178309\n3524578\n5702887\n9227465\n14930352\n24157817\n39088169\n63245986\n102334155\n165580141\n267914296\n433494437\n701408733\n1134903170\n1836311903\n2971215073\n4807526976\n7778742049\n12586269025\n20365011074\n32951280099\n53316291173\n86267571272\n139583862445\n225851433717\n365435296162\n591286729879\n956722026041\n1548008755920\n2504730781961\n4052739537881\n6557470319842\n10610209857723\n17167680177565\n27777890035288\n44945570212853\n72723460248141\n117669030460994\n190392490709135\n308061521170129\n498454011879264\n806515533049393\n1304969544928657\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 2111485077978050, 
+        "arr": [
+          "REF", 
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+        ]
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+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n2\n3\n5\n8\n13\n21\n34\n55\n89\n144\n233\n377\n610\n987\n1597\n2584\n4181\n6765\n10946\n17711\n28657\n46368\n75025\n121393\n196418\n317811\n514229\n832040\n1346269\n2178309\n3524578\n5702887\n9227465\n14930352\n24157817\n39088169\n63245986\n102334155\n165580141\n267914296\n433494437\n701408733\n1134903170\n1836311903\n2971215073\n4807526976\n7778742049\n12586269025\n20365011074\n32951280099\n53316291173\n86267571272\n139583862445\n225851433717\n365435296162\n591286729879\n956722026041\n1548008755920\n2504730781961\n4052739537881\n6557470319842\n10610209857723\n17167680177565\n27777890035288\n44945570212853\n72723460248141\n117669030460994\n190392490709135\n308061521170129\n498454011879264\n806515533049393\n1304969544928657\n2111485077978050\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 2111485077978050, 
+        "arr": [
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+        ]
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+        ]
+      }, 
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n2\n3\n5\n8\n13\n21\n34\n55\n89\n144\n233\n377\n610\n987\n1597\n2584\n4181\n6765\n10946\n17711\n28657\n46368\n75025\n121393\n196418\n317811\n514229\n832040\n1346269\n2178309\n3524578\n5702887\n9227465\n14930352\n24157817\n39088169\n63245986\n102334155\n165580141\n267914296\n433494437\n701408733\n1134903170\n1836311903\n2971215073\n4807526976\n7778742049\n12586269025\n20365011074\n32951280099\n53316291173\n86267571272\n139583862445\n225851433717\n365435296162\n591286729879\n956722026041\n1548008755920\n2504730781961\n4052739537881\n6557470319842\n10610209857723\n17167680177565\n27777890035288\n44945570212853\n72723460248141\n117669030460994\n190392490709135\n308061521170129\n498454011879264\n806515533049393\n1304969544928657\n2111485077978050\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 3416454622906707, 
+        "arr": [
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+        ]
+      }, 
+      "heap": {
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+        ]
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n2\n3\n5\n8\n13\n21\n34\n55\n89\n144\n233\n377\n610\n987\n1597\n2584\n4181\n6765\n10946\n17711\n28657\n46368\n75025\n121393\n196418\n317811\n514229\n832040\n1346269\n2178309\n3524578\n5702887\n9227465\n14930352\n24157817\n39088169\n63245986\n102334155\n165580141\n267914296\n433494437\n701408733\n1134903170\n1836311903\n2971215073\n4807526976\n7778742049\n12586269025\n20365011074\n32951280099\n53316291173\n86267571272\n139583862445\n225851433717\n365435296162\n591286729879\n956722026041\n1548008755920\n2504730781961\n4052739537881\n6557470319842\n10610209857723\n17167680177565\n27777890035288\n44945570212853\n72723460248141\n117669030460994\n190392490709135\n308061521170129\n498454011879264\n806515533049393\n1304969544928657\n2111485077978050\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 3416454622906707, 
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1304969544928657, 
+          2111485077978050, 
+          3416454622906707
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n2\n3\n5\n8\n13\n21\n34\n55\n89\n144\n233\n377\n610\n987\n1597\n2584\n4181\n6765\n10946\n17711\n28657\n46368\n75025\n121393\n196418\n317811\n514229\n832040\n1346269\n2178309\n3524578\n5702887\n9227465\n14930352\n24157817\n39088169\n63245986\n102334155\n165580141\n267914296\n433494437\n701408733\n1134903170\n1836311903\n2971215073\n4807526976\n7778742049\n12586269025\n20365011074\n32951280099\n53316291173\n86267571272\n139583862445\n225851433717\n365435296162\n591286729879\n956722026041\n1548008755920\n2504730781961\n4052739537881\n6557470319842\n10610209857723\n17167680177565\n27777890035288\n44945570212853\n72723460248141\n117669030460994\n190392490709135\n308061521170129\n498454011879264\n806515533049393\n1304969544928657\n2111485077978050\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 3416454622906707, 
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          2111485077978050, 
+          3416454622906707
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "exception_msg": "(stopped after 300 steps to prevent possible infinite loop)", 
+      "event": "instruction_limit_reached"
+    }
+  ]
+}
diff --git a/v3/example-code/filter.golden_py3 b/v3/example-code/filter.golden_py3
new file mode 100644
index 000000000..1e1111344
--- /dev/null
+++ b/v3/example-code/filter.golden_py3
@@ -0,0 +1,1505 @@
+{
+  "code": "input = [(\"Mary\", 27), (\"Joe\", 30), (\"Ruth\", 43), (\"Bob\", 17), (\"Jenny\", 22)]\n\nyoungPeople = []\n\nfor (person, age) in input:\n    if age < 30:\n        youngPeople.append(person)\n    else:\n        print(\"HAHA \" + person + \" is too old!\")\n\nprint(\"There are \" + str(len(youngPeople)) + \" young people\")\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "input": [
+          "REF", 
+          1
+        ], 
+        "youngPeople": [
+          "REF", 
+          7
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST"
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Mary", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 27, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST"
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Mary", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 27, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST"
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Mary", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 27, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST", 
+          "Mary"
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Joe", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 30, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST", 
+          "Mary"
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Joe", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 30, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST", 
+          "Mary"
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "HAHA Joe is too old!\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Joe", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 30, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST", 
+          "Mary"
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
+      "stdout": "HAHA Joe is too old!\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "person": "Ruth", 
+        "youngPeople": [
+          "REF", 
+          7
+        ], 
+        "age": 43, 
+        "input": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ], 
+          [
+            "REF", 
+            4
+          ], 
+          [
+            "REF", 
+            5
+          ], 
+          [
+            "REF", 
+            6
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "Mary", 
+          27
+        ], 
+        "3": [
+          "TUPLE", 
+          "Joe", 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          "Ruth", 
+          43
+        ], 
+        "5": [
+          "TUPLE", 
+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST", 
+          "Mary"
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
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+    }, 
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+      "event": "step_line"
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+        ], 
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+          "Bob", 
+          17
+        ], 
+        "6": [
+          "TUPLE", 
+          "Jenny", 
+          22
+        ], 
+        "7": [
+          "LIST", 
+          "Mary", 
+          "Bob", 
+          "Jenny"
+        ]
+      }, 
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+      "event": "step_line"
+    }, 
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+        "youngPeople", 
+        "person", 
+        "age"
+      ], 
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+      "func_name": "", 
+      "stack_to_render": [], 
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+        ], 
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+            4
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+          [
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+          ]
+        ], 
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+          "Joe", 
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+        ], 
+        "4": [
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+          "Ruth", 
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+        ], 
+        "5": [
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+          "Bob", 
+          17
+        ], 
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+          "Jenny", 
+          22
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+          "Mary", 
+          "Bob", 
+          "Jenny"
+        ]
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+      "event": "step_line"
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+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
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+          ]
+        ], 
+        "2": [
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+          "Mary", 
+          27
+        ], 
+        "3": [
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+          "Joe", 
+          30
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+          "Ruth", 
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+          "Bob", 
+          17
+        ], 
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+          "Jenny", 
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+        "7": [
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+          "Mary", 
+          "Bob", 
+          "Jenny"
+        ]
+      }, 
+      "line": 11, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/example-code/for-else.golden_py3 b/v3/example-code/for-else.golden_py3
new file mode 100644
index 000000000..ad8845399
--- /dev/null
+++ b/v3/example-code/for-else.golden_py3
@@ -0,0 +1,1475 @@
+{
+  "code": "# find primes using a for-else construct\nfor n in range(2, 10):\n    x_range = range(2, n)\n    for x in x_range:\n        if n % x == 0:\n            break\n    else:\n        # loop fell through without finding a factor\n        print(n)\n", 
+  "trace": [
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+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
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+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
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+      "event": "step_line"
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+    {
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+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
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+          "range"
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+      "line": 4, 
+      "event": "step_line"
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+      "ordered_globals": [
+        "n", 
+        "x_range"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          1
+        ], 
+        "n": 2
+      }, 
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+          "range"
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+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range"
+      ], 
+      "stdout": "2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          1
+        ], 
+        "n": 2
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+      "heap": {
+        "1": [
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+          "range"
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+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range"
+      ], 
+      "stdout": "2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          1
+        ], 
+        "n": 3
+      }, 
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+          "range"
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
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+        "x_range"
+      ], 
+      "stdout": "2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          2
+        ], 
+        "n": 3
+      }, 
+      "heap": {
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+          "range"
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+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          2
+        ], 
+        "n": 3, 
+        "x": 2
+      }, 
+      "heap": {
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+          "range"
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+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          2
+        ], 
+        "n": 3, 
+        "x": 2
+      }, 
+      "heap": {
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+          "range"
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+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          2
+        ], 
+        "n": 3, 
+        "x": 2
+      }, 
+      "heap": {
+        "2": [
+          "INSTANCE", 
+          "range"
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          2
+        ], 
+        "n": 3, 
+        "x": 2
+      }, 
+      "heap": {
+        "2": [
+          "INSTANCE", 
+          "range"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          2
+        ], 
+        "n": 4, 
+        "x": 2
+      }, 
+      "heap": {
+        "2": [
+          "INSTANCE", 
+          "range"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
+      "stdout": "2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x_range": [
+          "REF", 
+          1
+        ], 
+        "n": 4, 
+        "x": 2
+      }, 
+      "heap": {
+        "1": [
+          "INSTANCE", 
+          "range"
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "n", 
+        "x_range", 
+        "x"
+      ], 
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diff --git a/v3/example-code/gen_primes.golden_py3 b/v3/example-code/gen_primes.golden_py3
new file mode 100644
index 000000000..802f27735
--- /dev/null
+++ b/v3/example-code/gen_primes.golden_py3
@@ -0,0 +1,12512 @@
+{
+  "code": "# Use generator to generate a stream of primes\ndef gen_primes():\n    n = 2\n    while True:\n        for x in range(2, n):\n            if n % x == 0:\n                break\n        else:\n            yield n\n        n += 1\n\nfor p in gen_primes():\n    print(p)\n\n", 
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diff --git a/v3/example-code/genexpr.golden_py3 b/v3/example-code/genexpr.golden_py3
new file mode 100644
index 000000000..10ad0ebac
--- /dev/null
+++ b/v3/example-code/genexpr.golden_py3
@@ -0,0 +1,2170 @@
+{
+  "code": "# NB: there's a known bug when frames of exited functions are displayed\nx = (i for i in range(10))\n\nfor e in x:\n    print(e)\n", 
+  "trace": [
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+      "stack_to_render": [], 
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+      "event": "call"
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+      "event": "step_line"
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diff --git a/v3/example-code/happy.golden_py3 b/v3/example-code/happy.golden_py3
new file mode 100644
index 000000000..ea1a6a7e0
--- /dev/null
+++ b/v3/example-code/happy.golden_py3
@@ -0,0 +1,952 @@
+{
+  "code": "# From \"Teaching with Python\" by John Zelle\ndef happy():\n    print(\"Happy Birthday to you!\")\n\ndef sing(P):\n    happy()\n    happy()\n    print(\"Happy Birthday dear \" + P + \"!\")\n    happy()\n\n# main\nsing(\"Fred\")\n", 
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+      "event": "call"
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+      "event": "step_line"
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+      "stdout": "Happy Birthday to you!\n", 
+      "func_name": "happy", 
+      "stack_to_render": [
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+      "event": "return"
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+      "func_name": "happy", 
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+      "stdout": "Happy Birthday to you!\nHappy Birthday to you!\nHappy Birthday dear Fred!\n", 
+      "func_name": "sing", 
+      "stack_to_render": [
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+          "frame_id": 1, 
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+      "stdout": "Happy Birthday to you!\nHappy Birthday to you!\nHappy Birthday dear Fred!\n", 
+      "func_name": "happy", 
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+      "stdout": "Happy Birthday to you!\nHappy Birthday to you!\nHappy Birthday dear Fred!\n", 
+      "func_name": "happy", 
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+}
diff --git a/v3/example-code/ins_sort.golden_py3 b/v3/example-code/ins_sort.golden_py3
new file mode 100644
index 000000000..837933f43
--- /dev/null
+++ b/v3/example-code/ins_sort.golden_py3
@@ -0,0 +1,3538 @@
+{
+  "code": "# from: http://www.ece.uci.edu/~chou/py02/python.html\ndef InsertionSort(A):\n    for j in range(1, len(A)):\n        key = A[j]\n        i = j - 1\n        while (i >= 0) and (A[i] > key):\n            A[i+1] = A[i]\n            i = i - 1\n        A[i+1] = key\n\ninput = [8, 3, 9, 15, 29, 7, 10]\nInsertionSort(input)\nprint(input)\n", 
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diff --git a/v3/example-code/linked-lists/ll1.golden_py3 b/v3/example-code/linked-lists/ll1.golden_py3
new file mode 100644
index 000000000..1da0bbfb2
--- /dev/null
+++ b/v3/example-code/linked-lists/ll1.golden_py3
@@ -0,0 +1,1977 @@
+{
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diff --git a/v3/example-code/linked-lists/ll2.golden_py3 b/v3/example-code/linked-lists/ll2.golden_py3
new file mode 100644
index 000000000..7a4d0bbe0
--- /dev/null
+++ b/v3/example-code/linked-lists/ll2.golden_py3
@@ -0,0 +1,9885 @@
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diff --git a/v3/example-code/list-comp.golden_py3 b/v3/example-code/list-comp.golden_py3
new file mode 100644
index 000000000..5d999ccae
--- /dev/null
+++ b/v3/example-code/list-comp.golden_py3
@@ -0,0 +1,926 @@
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diff --git a/v3/example-code/map.golden_py3 b/v3/example-code/map.golden_py3
new file mode 100644
index 000000000..30214b328
--- /dev/null
+++ b/v3/example-code/map.golden_py3
@@ -0,0 +1,6953 @@
+{
+  "code": "# Functional programming with map\n# Adapted from MIT 6.01 course notes (Section A.2.3)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\ndef map(func, lst):\n    if lst == []:\n        return []\n    else:\n        return [func(lst[0])] + map(func, lst[1:])\n    \ndef halveElements(lst):\n    return map(lambda x: x / 2.0, lst)\n  \ninput = [2, 4, 6, 8, 10]\noutput = halveElements(input)\n", 
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diff --git a/v3/example-code/memo_fib.golden_py3 b/v3/example-code/memo_fib.golden_py3
new file mode 100644
index 000000000..abb03047a
--- /dev/null
+++ b/v3/example-code/memo_fib.golden_py3
@@ -0,0 +1,10715 @@
+{
+  "code": "# use memoization to make the recursive Fibonacci\n# implementation only take O(n) time and space\n\nMemoTable = {}\n\ndef MemoizedFib(n):\n    if n <= 2:\n        return 1\n\n    if n in MemoTable:\n        return MemoTable[n]\n\n    MemoTable[n] = MemoizedFib(n-1) + MemoizedFib(n-2)\n    return MemoTable[n]\n\n\nres = MemoizedFib(10)\n", 
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diff --git a/v3/example-code/nonlocal.golden_py3 b/v3/example-code/nonlocal.golden_py3
new file mode 100644
index 000000000..e865e76cc
--- /dev/null
+++ b/v3/example-code/nonlocal.golden_py3
@@ -0,0 +1,667 @@
+{
+  "code": "# 'nonlocal' keyword is only in Python 3\ndef outer():\n    x = 1\n    def inner():\n        nonlocal x\n        x = 2\n        y = x\n        print(\"inner:\", x, y)\n    inner()\n    print(\"outer:\", x)\n\nouter()\n", 
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diff --git a/v3/example-code/oop_1.golden_py3 b/v3/example-code/oop_1.golden_py3
new file mode 100644
index 000000000..fbed56886
--- /dev/null
+++ b/v3/example-code/oop_1.golden_py3
@@ -0,0 +1,2428 @@
+{
+  "code": "# Object-oriented programming intro\n# Adapted from MIT 6.01 course notes (Section 3.5)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\nclass Staff601:\n    course = '6.01'\n    building = 34\n    room = 501\n\n    def salutation(self):\n        return self.role + ' ' + self.name\n\npat = Staff601()\nprint(pat.course)\n\npat.name = 'Pat'\npat.age = 60\npat.role = 'Professor'\n\nprint(pat.building)\npat.building = 32\nprint(pat.building)\n\nprint(pat.salutation())\nprint(Staff601.salutation(pat))\n", 
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+          "func_name": "salutation", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "salutation_f2", 
+          "ordered_varnames": [
+            "self"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "pat": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "2": [
+          "FUNCTION", 
+          "salutation(self)", 
+          1
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "4": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "building", 
+            32
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n34\n32\n", 
+      "func_name": "salutation", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "__return__": [
+              "REF", 
+              1
+            ], 
+            "room": 501, 
+            "course": "6.01", 
+            "salutation": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "room", 
+            "salutation", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": "Professor Pat", 
+            "self": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "salutation", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "salutation_f2", 
+          "ordered_varnames": [
+            "self", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "pat": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "2": [
+          "FUNCTION", 
+          "salutation(self)", 
+          1
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "4": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "building", 
+            32
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 11, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n34\n32\nProfessor Pat\n", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "__return__": [
+              "REF", 
+              1
+            ], 
+            "room": 501, 
+            "course": "6.01", 
+            "salutation": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "room", 
+            "salutation", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "pat": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "2": [
+          "FUNCTION", 
+          "salutation(self)", 
+          1
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "4": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "building", 
+            32
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 25, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n34\n32\nProfessor Pat\n", 
+      "func_name": "salutation", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "__return__": [
+              "REF", 
+              1
+            ], 
+            "room": 501, 
+            "course": "6.01", 
+            "salutation": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "room", 
+            "salutation", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "self": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "salutation", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "salutation_f3", 
+          "ordered_varnames": [
+            "self"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "pat": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "2": [
+          "FUNCTION", 
+          "salutation(self)", 
+          1
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "4": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "building", 
+            32
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 10, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n34\n32\nProfessor Pat\n", 
+      "func_name": "salutation", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "__return__": [
+              "REF", 
+              1
+            ], 
+            "room": 501, 
+            "course": "6.01", 
+            "salutation": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "room", 
+            "salutation", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "self": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "salutation", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "salutation_f3", 
+          "ordered_varnames": [
+            "self"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "pat": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "2": [
+          "FUNCTION", 
+          "salutation(self)", 
+          1
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "4": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "building", 
+            32
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n34\n32\nProfessor Pat\n", 
+      "func_name": "salutation", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "__return__": [
+              "REF", 
+              1
+            ], 
+            "room": 501, 
+            "course": "6.01", 
+            "salutation": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "room", 
+            "salutation", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "__return__": "Professor Pat", 
+            "self": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "salutation", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "salutation_f3", 
+          "ordered_varnames": [
+            "self", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "pat": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "2": [
+          "FUNCTION", 
+          "salutation(self)", 
+          1
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "4": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "building", 
+            32
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 11, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n34\n32\nProfessor Pat\nProfessor Pat\n", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "__return__": [
+              "REF", 
+              1
+            ], 
+            "room": 501, 
+            "course": "6.01", 
+            "salutation": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "room", 
+            "salutation", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "pat": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "2": [
+          "FUNCTION", 
+          "salutation(self)", 
+          1
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "4": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "building", 
+            32
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 25, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/example-code/oop_2.golden_py3 b/v3/example-code/oop_2.golden_py3
new file mode 100644
index 000000000..5a289ce75
--- /dev/null
+++ b/v3/example-code/oop_2.golden_py3
@@ -0,0 +1,2258 @@
+{
+  "code": "# The __init__ 'constructor' - object-oriented programming intro\n# Adapted from MIT 6.01 course notes (Section 3.5)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\nclass Staff601:\n    course = '6.01'\n    building = 34\n    room = 501\n\n    def __init__(self, name, role, years, salary):\n      self.name = name\n      self.role = role\n      self.age = years\n      self.salary = salary\n\n    def salutation(self):\n        return self.role + ' ' + self.name\n\npat = Staff601('Pat', 'Professor', 60, 100000)\nprint(pat.salutation())\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 5, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "course": "6.01"
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": [
+            "course"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "course", 
+            "6.01"
+          ]
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
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+        ], 
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+      "event": "step_line"
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+        ], 
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+        ], 
+        "4": [
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+          "Staff601", 
+          [], 
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+            ]
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+          [
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+          [
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+          [
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+            "Professor"
+          ], 
+          [
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+            100000
+          ]
+        ]
+      }, 
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+      "event": "return"
+    }, 
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+      "stack_to_render": [
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+            "room": 501, 
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+      ], 
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+            ]
+          ], 
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+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
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+          "__init__(self, name, role, years, salary)", 
+          1
+        ], 
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+          "salutation(self)", 
+          1
+        ], 
+        "4": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
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+            [
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+              2
+            ]
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+          ], 
+          [
+            "salutation", 
+            [
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+              3
+            ]
+          ]
+        ], 
+        "5": [
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+          "Staff601", 
+          [
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+          ], 
+          [
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+          [
+            "role", 
+            "Professor"
+          ], 
+          [
+            "salary", 
+            100000
+          ]
+        ]
+      }, 
+      "line": 20, 
+      "event": "step_line"
+    }, 
+    {
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+      ], 
+      "stdout": "", 
+      "func_name": "salutation", 
+      "stack_to_render": [
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+              3
+            ], 
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+            ]
+          }, 
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+          "is_parent": true, 
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+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
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+            "course", 
+            "room", 
+            "salutation", 
+            "__return__"
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+          "encoded_locals": {
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+              5
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+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "salutation", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
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+          ], 
+          "unique_hash": "salutation_f3", 
+          "ordered_varnames": [
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+          ]
+        }
+      ], 
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+        ], 
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+        ], 
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+            ]
+          ]
+        ], 
+        "5": [
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+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "name", 
+            "Pat"
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+            100000
+          ]
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+      }, 
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+      "event": "call"
+    }, 
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+        "pat"
+      ], 
+      "stdout": "", 
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+            ], 
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+            "course": "6.01", 
+            "salutation": [
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+            ], 
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+            ]
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+          "is_parent": true, 
+          "func_name": "Staff601", 
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+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "__init__", 
+            "building", 
+            "course", 
+            "room", 
+            "salutation", 
+            "__return__"
+          ]
+        }, 
+        {
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+          "encoded_locals": {
+            "self": [
+              "REF", 
+              5
+            ]
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+          "func_name": "salutation", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
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+          ], 
+          "unique_hash": "salutation_f3", 
+          "ordered_varnames": [
+            "self"
+          ]
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+      ], 
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+        ]
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+            [
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+            ]
+          ]
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+          "__init__(self, name, role, years, salary)", 
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+          "salutation(self)", 
+          1
+        ], 
+        "4": [
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+          [], 
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+              "REF", 
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+            ]
+          ]
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+            60
+          ], 
+          [
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+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ], 
+          [
+            "salary", 
+            100000
+          ]
+        ]
+      }, 
+      "line": 17, 
+      "event": "step_line"
+    }, 
+    {
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+        "pat"
+      ], 
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+      "func_name": "salutation", 
+      "stack_to_render": [
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+            ], 
+            "room": 501, 
+            "course": "6.01", 
+            "salutation": [
+              "REF", 
+              3
+            ], 
+            "__init__": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "__init__", 
+            "building", 
+            "course", 
+            "room", 
+            "salutation", 
+            "__return__"
+          ]
+        }, 
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+          "frame_id": 3, 
+          "encoded_locals": {
+            "__return__": "Professor Pat", 
+            "self": [
+              "REF", 
+              5
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "salutation", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
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+          ], 
+          "unique_hash": "salutation_f3", 
+          "ordered_varnames": [
+            "self", 
+            "__return__"
+          ]
+        }
+      ], 
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+        ], 
+        "pat": [
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+        ]
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+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "2": [
+          "FUNCTION", 
+          "__init__(self, name, role, years, salary)", 
+          1
+        ], 
+        "3": [
+          "FUNCTION", 
+          "salutation(self)", 
+          1
+        ], 
+        "4": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "5": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ], 
+          [
+            "salary", 
+            100000
+          ]
+        ]
+      }, 
+      "line": 17, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "Professor Pat\n", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
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+            "__return__": [
+              "REF", 
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+            ], 
+            "room": 501, 
+            "course": "6.01", 
+            "salutation": [
+              "REF", 
+              3
+            ], 
+            "__init__": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "__init__", 
+            "building", 
+            "course", 
+            "room", 
+            "salutation", 
+            "__return__"
+          ]
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+      ], 
+      "globals": {
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+        ], 
+        "pat": [
+          "REF", 
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+        ]
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+          [
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+            "course", 
+            "6.01"
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "2": [
+          "FUNCTION", 
+          "__init__(self, name, role, years, salary)", 
+          1
+        ], 
+        "3": [
+          "FUNCTION", 
+          "salutation(self)", 
+          1
+        ], 
+        "4": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "5": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ], 
+          [
+            "salary", 
+            100000
+          ]
+        ]
+      }, 
+      "line": 20, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/example-code/oop_inherit.golden_py3 b/v3/example-code/oop_inherit.golden_py3
new file mode 100644
index 000000000..c5aa17dc7
--- /dev/null
+++ b/v3/example-code/oop_inherit.golden_py3
@@ -0,0 +1,3159 @@
+{
+  "code": "# Inheritance - object-oriented programming intro\n# Adapted from MIT 6.01 course notes (Section 3.5)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\nclass Staff601:\n    course = '6.01'\n    building = 34\n    room = 501\n\n    def giveRaise(self, percentage):\n        self.salary = self.salary + self.salary * percentage\n\nclass Prof601(Staff601):\n    salary = 100000\n\n    def __init__(self, name, age):\n        self.name = name\n        self.giveRaise((age - 18) * 0.03)\n\n    def salutation(self):\n        return self.role + ' ' + self.name\n\npat = Prof601('Pat', 60)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
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+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 5, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": []
+        }
+      ], 
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+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "giveRaise": [
+              "REF", 
+              2
+            ], 
+            "room": 501, 
+            "course": "6.01", 
+            "__return__": [
+              "REF", 
+              1
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "giveRaise", 
+            "room", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "salary": 100000, 
+            "salutation": [
+              "REF", 
+              6
+            ], 
+            "__init__": [
+              "REF", 
+              5
+            ], 
+            "__return__": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Prof601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Prof601_f2_p_z", 
+          "ordered_varnames": [
+            "__init__", 
+            "salary", 
+            "salutation", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "age": 60, 
+            "name": "Pat", 
+            "self": [
+              "REF", 
+              8
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "__init__", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            2
+          ], 
+          "unique_hash": "__init___f3", 
+          "ordered_varnames": [
+            "self", 
+            "name", 
+            "age"
+          ]
+        }, 
+        {
+          "frame_id": 4, 
+          "encoded_locals": {
+            "percentage": 1.260, 
+            "self": [
+              "REF", 
+              8
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "giveRaise", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "giveRaise_f4", 
+          "ordered_varnames": [
+            "self", 
+            "percentage"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "Prof601": [
+          "REF", 
+          7
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ]
+        ], 
+        "2": [
+          "FUNCTION", 
+          "giveRaise(self, percentage)", 
+          1
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "4": [
+          "DICT", 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              6
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              5
+            ]
+          ]
+        ], 
+        "5": [
+          "FUNCTION", 
+          "__init__(self, name, age)", 
+          2
+        ], 
+        "6": [
+          "FUNCTION", 
+          "salutation(self)", 
+          2
+        ], 
+        "7": [
+          "CLASS", 
+          "Prof601", 
+          [
+            "Staff601"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              6
+            ]
+          ]
+        ], 
+        "8": [
+          "INSTANCE", 
+          "Prof601", 
+          [
+            "name", 
+            "Pat"
+          ]
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "Prof601"
+      ], 
+      "stdout": "", 
+      "func_name": "giveRaise", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "giveRaise": [
+              "REF", 
+              2
+            ], 
+            "room": 501, 
+            "course": "6.01", 
+            "__return__": [
+              "REF", 
+              1
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "giveRaise", 
+            "room", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "salary": 100000, 
+            "salutation": [
+              "REF", 
+              6
+            ], 
+            "__init__": [
+              "REF", 
+              5
+            ], 
+            "__return__": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Prof601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Prof601_f2_p_z", 
+          "ordered_varnames": [
+            "__init__", 
+            "salary", 
+            "salutation", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "age": 60, 
+            "name": "Pat", 
+            "self": [
+              "REF", 
+              8
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "__init__", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            2
+          ], 
+          "unique_hash": "__init___f3", 
+          "ordered_varnames": [
+            "self", 
+            "name", 
+            "age"
+          ]
+        }, 
+        {
+          "frame_id": 4, 
+          "encoded_locals": {
+            "__return__": null, 
+            "percentage": 1.260, 
+            "self": [
+              "REF", 
+              8
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "giveRaise", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "giveRaise_f4", 
+          "ordered_varnames": [
+            "self", 
+            "percentage", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "Prof601": [
+          "REF", 
+          7
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ]
+        ], 
+        "2": [
+          "FUNCTION", 
+          "giveRaise(self, percentage)", 
+          1
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "4": [
+          "DICT", 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              6
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              5
+            ]
+          ]
+        ], 
+        "5": [
+          "FUNCTION", 
+          "__init__(self, name, age)", 
+          2
+        ], 
+        "6": [
+          "FUNCTION", 
+          "salutation(self)", 
+          2
+        ], 
+        "7": [
+          "CLASS", 
+          "Prof601", 
+          [
+            "Staff601"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              6
+            ]
+          ]
+        ], 
+        "8": [
+          "INSTANCE", 
+          "Prof601", 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "salary", 
+            226000.000
+          ]
+        ]
+      }, 
+      "line": 11, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "Prof601"
+      ], 
+      "stdout": "", 
+      "func_name": "__init__", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "giveRaise": [
+              "REF", 
+              2
+            ], 
+            "room": 501, 
+            "course": "6.01", 
+            "__return__": [
+              "REF", 
+              1
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "giveRaise", 
+            "room", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "salary": 100000, 
+            "salutation": [
+              "REF", 
+              6
+            ], 
+            "__init__": [
+              "REF", 
+              5
+            ], 
+            "__return__": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Prof601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Prof601_f2_p_z", 
+          "ordered_varnames": [
+            "__init__", 
+            "salary", 
+            "salutation", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "__return__": null, 
+            "age": 60, 
+            "name": "Pat", 
+            "self": [
+              "REF", 
+              8
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "__init__", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            2
+          ], 
+          "unique_hash": "__init___f3", 
+          "ordered_varnames": [
+            "self", 
+            "name", 
+            "age", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "Prof601": [
+          "REF", 
+          7
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ]
+        ], 
+        "2": [
+          "FUNCTION", 
+          "giveRaise(self, percentage)", 
+          1
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "4": [
+          "DICT", 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              6
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              5
+            ]
+          ]
+        ], 
+        "5": [
+          "FUNCTION", 
+          "__init__(self, name, age)", 
+          2
+        ], 
+        "6": [
+          "FUNCTION", 
+          "salutation(self)", 
+          2
+        ], 
+        "7": [
+          "CLASS", 
+          "Prof601", 
+          [
+            "Staff601"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              6
+            ]
+          ]
+        ], 
+        "8": [
+          "INSTANCE", 
+          "Prof601", 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "salary", 
+            226000.000
+          ]
+        ]
+      }, 
+      "line": 18, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "Prof601", 
+        "pat"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "giveRaise": [
+              "REF", 
+              2
+            ], 
+            "room": 501, 
+            "course": "6.01", 
+            "__return__": [
+              "REF", 
+              1
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Staff601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1_p_z", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "giveRaise", 
+            "room", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "salary": 100000, 
+            "salutation": [
+              "REF", 
+              6
+            ], 
+            "__init__": [
+              "REF", 
+              5
+            ], 
+            "__return__": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Prof601", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Prof601_f2_p_z", 
+          "ordered_varnames": [
+            "__init__", 
+            "salary", 
+            "salutation", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          3
+        ], 
+        "pat": [
+          "REF", 
+          8
+        ], 
+        "Prof601": [
+          "REF", 
+          7
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ]
+        ], 
+        "2": [
+          "FUNCTION", 
+          "giveRaise(self, percentage)", 
+          1
+        ], 
+        "3": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "giveRaise", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "4": [
+          "DICT", 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              6
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              5
+            ]
+          ]
+        ], 
+        "5": [
+          "FUNCTION", 
+          "__init__(self, name, age)", 
+          2
+        ], 
+        "6": [
+          "FUNCTION", 
+          "salutation(self)", 
+          2
+        ], 
+        "7": [
+          "CLASS", 
+          "Prof601", 
+          [
+            "Staff601"
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "salary", 
+            100000
+          ], 
+          [
+            "salutation", 
+            [
+              "REF", 
+              6
+            ]
+          ]
+        ], 
+        "8": [
+          "INSTANCE", 
+          "Prof601", 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "salary", 
+            226000.000
+          ]
+        ]
+      }, 
+      "line": 23, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/example-code/oop_small.golden_py3 b/v3/example-code/oop_small.golden_py3
new file mode 100644
index 000000000..53667117e
--- /dev/null
+++ b/v3/example-code/oop_small.golden_py3
@@ -0,0 +1,2087 @@
+{
+  "code": "class A:\n    x = 1\n    y = 'hello'\n\nclass B:\n    z = 'bye'\n\nclass C(A,B):\n    def salutation(self):\n        return '%d %s %s' % (self.x, self.y, self.z)\n\ninst = C()\nprint(inst.salutation())\ninst.x = 100\nprint(inst.salutation())\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "A", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "A", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "A_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "A", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "A", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "A_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "A", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "A", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "A_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "A", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "A", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "A_f1", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "x", 
+            1
+          ]
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "A", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
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diff --git a/v3/example-code/py_tutorial.golden_py3 b/v3/example-code/py_tutorial.golden_py3
new file mode 100644
index 000000000..a3b9a2ffe
--- /dev/null
+++ b/v3/example-code/py_tutorial.golden_py3
@@ -0,0 +1,4754 @@
+{
+  "code": "# Philip's 10-minute intro to Python\n\n# numbers!\nage = 26\npi = 3.14159\n\n# strings!\ns = 'Rutherford Birchard Hayes'\ntokens = s.split()\nfirstName = tokens[0]\nmiddleName = tokens[1]\nlastName = tokens[2]\ns2 = firstName + ' ' + middleName + ' ' + lastName\n\n# 'if' statement - indentation matters!\nif (s == s2):\n    print('yes!!!')\nelse:\n    print('nooooooo')\n\n# list (mutable sequence)\nbeatles = ['John', 'Paul', 'George']\nbeatles.append('Ringo')\n\n# 'for' loop - indentation matters!\nfor b in beatles:\n    print('Hello ' + b)\n\n# tuple (immutable sequence)\nages = (18, 21, 28, 21, 22, 18, 19, 34, 9)\n\n# set (no order, no duplicates)\nuniqueAges = set(ages)\nuniqueAges.add(18) # already in set, no effect\nuniqueAges.remove(21)\n\n# no guaranteed order when iterating over a set\nfor thisAge in uniqueAges:\n    print(thisAge)\n\n# testing set membership\nif 18 in uniqueAges:\n    print('There is an 18-year-old present!')\n\n# sorting\nbeatles.sort() # in-place\norderedUniqueAges = sorted(uniqueAges) # new list\n\n# dict - mapping unique keys to values\nnetWorth = {}\nnetWorth['Donald Trump'] = 3000000000\nnetWorth['Bill Gates'] = 58000000000\nnetWorth['Tom Cruise'] = 40000000\nnetWorth['Joe Postdoc'] = 20000\n\n# iterating over key-value pairs:\nfor (person, worth) in netWorth.items():\n    if worth < 1000000:\n        print('haha ' + person + ' is not a millionaire')\n\n# testing dict membership\nif 'Tom Cruise' in netWorth:\n    print('show me the money!')\n", 
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diff --git a/v3/example-code/sqrt.golden_py3 b/v3/example-code/sqrt.golden_py3
new file mode 100644
index 000000000..324f6870c
--- /dev/null
+++ b/v3/example-code/sqrt.golden_py3
@@ -0,0 +1,8929 @@
+{
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+}
diff --git a/v3/example-code/strtok.golden_py3 b/v3/example-code/strtok.golden_py3
new file mode 100644
index 000000000..3c5031e8f
--- /dev/null
+++ b/v3/example-code/strtok.golden_py3
@@ -0,0 +1,258 @@
+{
+  "code": "input = 'John,Doe,1984,4,1,male'\n\ntokens = input.split(',')\nfirstName = tokens[0]\nlastName = tokens[1]\nbirthdate = (int(tokens[2]), int(tokens[3]), int(tokens[4]))\nisMale = (tokens[5] == 'male')\n\nprint('Hi ' + firstName + ' ' + lastName)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "input": "John,Doe,1984,4,1,male"
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "tokens"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tokens": [
+          "REF", 
+          1
+        ], 
+        "input": "John,Doe,1984,4,1,male"
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "John", 
+          "Doe", 
+          "1984", 
+          "4", 
+          "1", 
+          "male"
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "tokens", 
+        "firstName"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tokens": [
+          "REF", 
+          1
+        ], 
+        "input": "John,Doe,1984,4,1,male", 
+        "firstName": "John"
+      }, 
+      "heap": {
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+          "LIST", 
+          "John", 
+          "Doe", 
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+          "4", 
+          "1", 
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+      }, 
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "tokens", 
+        "firstName", 
+        "lastName"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tokens": [
+          "REF", 
+          1
+        ], 
+        "lastName": "Doe", 
+        "firstName": "John", 
+        "input": "John,Doe,1984,4,1,male"
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "John", 
+          "Doe", 
+          "1984", 
+          "4", 
+          "1", 
+          "male"
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "tokens", 
+        "firstName", 
+        "lastName", 
+        "birthdate"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tokens": [
+          "REF", 
+          1
+        ], 
+        "lastName": "Doe", 
+        "firstName": "John", 
+        "birthdate": [
+          "REF", 
+          2
+        ], 
+        "input": "John,Doe,1984,4,1,male"
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "John", 
+          "Doe", 
+          "1984", 
+          "4", 
+          "1", 
+          "male"
+        ], 
+        "2": [
+          "TUPLE", 
+          1984, 
+          4, 
+          1
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "tokens", 
+        "firstName", 
+        "lastName", 
+        "birthdate", 
+        "isMale"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "isMale": true, 
+        "firstName": "John", 
+        "lastName": "Doe", 
+        "birthdate": [
+          "REF", 
+          2
+        ], 
+        "tokens": [
+          "REF", 
+          1
+        ], 
+        "input": "John,Doe,1984,4,1,male"
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          "John", 
+          "Doe", 
+          "1984", 
+          "4", 
+          "1", 
+          "male"
+        ], 
+        "2": [
+          "TUPLE", 
+          1984, 
+          4, 
+          1
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "input", 
+        "tokens", 
+        "firstName", 
+        "lastName", 
+        "birthdate", 
+        "isMale"
+      ], 
+      "stdout": "Hi John Doe\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
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diff --git a/v3/example-code/sum-cubes.golden_py3 b/v3/example-code/sum-cubes.golden_py3
new file mode 100644
index 000000000..6eecbbe30
--- /dev/null
+++ b/v3/example-code/sum-cubes.golden_py3
@@ -0,0 +1,1693 @@
+{
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diff --git a/v3/example-code/sum-list.golden_py3 b/v3/example-code/sum-list.golden_py3
new file mode 100644
index 000000000..c121417d9
--- /dev/null
+++ b/v3/example-code/sum-list.golden_py3
@@ -0,0 +1,3466 @@
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diff --git a/v3/example-code/sum.golden_py3 b/v3/example-code/sum.golden_py3
new file mode 100644
index 000000000..0186b5dff
--- /dev/null
+++ b/v3/example-code/sum.golden_py3
@@ -0,0 +1,10163 @@
+{
+  "code": "# Higher-order functions\n# Adapted from MIT 6.01 course notes (Section A.2.2)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\ndef summation(low, high, f, next):\n    s = 0\n    x = low\n    while x <= high:\n        s = s + f(x)\n        x = next(x)\n    return s\n\ndef sumsquares(low, high):\n    return summation(low, high, lambda x: x**2, lambda x: x+1)\n\nprint(sumsquares(1, 10))\n", 
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diff --git a/v3/example-code/towers_of_hanoi.golden_py3 b/v3/example-code/towers_of_hanoi.golden_py3
new file mode 100644
index 000000000..0b98e6d8c
--- /dev/null
+++ b/v3/example-code/towers_of_hanoi.golden_py3
@@ -0,0 +1,10996 @@
+{
+  "code": "# move a stack of n disks from stack a to stack b,\n# using tmp as a temporary stack\ndef TowerOfHanoi(n, a, b, tmp):\n    if n == 1:\n        b.append(a.pop())\n    else:\n        TowerOfHanoi(n-1, a, tmp, b)\n        b.append(a.pop())\n        TowerOfHanoi(n-1, tmp, b, a)\n        \nstack1 = [4,3,2,1]\nstack2 = []\nstack3 = []\n      \n# transfer stack1 to stack3 using Tower of Hanoi rules\nTowerOfHanoi(len(stack1), stack1, stack3, stack2)\n", 
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diff --git a/v3/example-code/varargs.golden_py3 b/v3/example-code/varargs.golden_py3
new file mode 100644
index 000000000..d12be8967
--- /dev/null
+++ b/v3/example-code/varargs.golden_py3
@@ -0,0 +1,1015 @@
+{
+  "code": "# Demonstrate *args and **kwargs\ndef f1(a, b, *rest):\n    pass\n\nf1(1, 2)\nf1(1, 2, 3, 4, 5, 6, 7)\n\ndef f2(a, b, **kwrest):\n    pass\n\nf2(1, 2, name='Bob', age=38)\n\ndef f3(a, b, *rest, **kwrest):\n    pass\n\nf3(1, 2, 3, 4, name='Bob', age=38)\n", 
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diff --git a/v3/example-code/wentworth_gcd.golden_py3 b/v3/example-code/wentworth_gcd.golden_py3
new file mode 100644
index 000000000..cc0273cb0
--- /dev/null
+++ b/v3/example-code/wentworth_gcd.golden_py3
@@ -0,0 +1,3798 @@
+{
+  "code": "# Tutorial code from Prof. Peter Wentworth\n# Rhodes University, South Africa (http://www.ru.ac.za/)\n\ndef gcd(x, y, depth=1):\n    '''\n    Find the greatest common divisor of x, y\n    Pre:  x >= y,  y >= 0, both x and y are int\n    '''\n    result = x       # set provisional return value\n    if y != 0:\n        indent = \"**\" * depth\n        print((\"%s About to recursively call gcd(%d, %d)\" % (indent, y, x%y)))\n        result = gcd(y, x % y, depth+1)\n        print((\"%s result is %d\" % (indent, result)))\n    return result\n\ndef main():\n    m = 77\n    n = 28\n    print((\"Finding gcd(%d, %d)\" % (m,n)))\n    g = gcd(m, n)\n    print(('Greatest common divisor of %d, %d = %d'\n          % (m, n, g)))\n\nmain()\n\n", 
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+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "main", 
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+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
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+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 28, 
+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "y": 21, 
+            "x": 28, 
+            "depth": 2, 
+            "indent": "****", 
+            "result": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
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+            "result", 
+            "indent"
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+        }, 
+        {
+          "frame_id": 4, 
+          "encoded_locals": {
+            "y": 7, 
+            "x": 21, 
+            "depth": 3, 
+            "result": 21
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f4", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
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+        {
+          "frame_id": 2, 
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+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
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+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
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+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "y": 21, 
+            "x": 28, 
+            "depth": 2, 
+            "indent": "****", 
+            "result": 28
+          }, 
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+          "ordered_varnames": [
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+        {
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+          "encoded_locals": {
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+            "x": 21, 
+            "depth": 3, 
+            "indent": "******", 
+            "result": 21
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f4", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
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+      "line": 12, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
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+        {
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+          "encoded_locals": {
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+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
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+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "y": 21, 
+            "x": 28, 
+            "depth": 2, 
+            "indent": "****", 
+            "result": 28
+          }, 
+          "is_highlighted": false, 
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+          "unique_hash": "gcd_f3", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
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+        }, 
+        {
+          "frame_id": 4, 
+          "encoded_locals": {
+            "y": 7, 
+            "x": 21, 
+            "depth": 3, 
+            "indent": "******", 
+            "result": 21
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
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+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f4", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
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+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
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+          "ordered_varnames": [
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+        {
+          "frame_id": 3, 
+          "encoded_locals": {
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+            "x": 28, 
+            "depth": 2, 
+            "indent": "****", 
+            "result": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f3", 
+          "ordered_varnames": [
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+            "depth", 
+            "result", 
+            "indent"
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+        {
+          "frame_id": 4, 
+          "encoded_locals": {
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+          "unique_hash": "gcd_f4", 
+          "ordered_varnames": [
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+        }, 
+        {
+          "frame_id": 5, 
+          "encoded_locals": {
+            "y": 0, 
+            "x": 7, 
+            "depth": 4
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f5", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth"
+          ]
+        }
+      ], 
+      "globals": {
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+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
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+        {
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+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
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+            "indent": "****", 
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+          }, 
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+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f3", 
+          "ordered_varnames": [
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+        }, 
+        {
+          "frame_id": 4, 
+          "encoded_locals": {
+            "y": 7, 
+            "x": 21, 
+            "depth": 3, 
+            "indent": "******", 
+            "result": 21
+          }, 
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+        }, 
+        {
+          "frame_id": 5, 
+          "encoded_locals": {
+            "y": 0, 
+            "x": 7, 
+            "depth": 4
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
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+      ], 
+      "globals": {
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
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+          }, 
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+            "indent": "****", 
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+          }, 
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+          "is_zombie": false, 
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+          "unique_hash": "gcd_f3", 
+          "ordered_varnames": [
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+        {
+          "frame_id": 4, 
+          "encoded_locals": {
+            "y": 7, 
+            "x": 21, 
+            "depth": 3, 
+            "indent": "******", 
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+          }, 
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+          "encoded_locals": {
+            "y": 0, 
+            "x": 7, 
+            "depth": 4, 
+            "result": 7
+          }, 
+          "is_highlighted": true, 
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+          "ordered_varnames": [
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+            "y", 
+            "depth", 
+            "result"
+          ]
+        }
+      ], 
+      "globals": {
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+          "REF", 
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+      "heap": {
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+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
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+          "frame_id": 1, 
+          "encoded_locals": {
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+          "ordered_varnames": [
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+            "indent": "****", 
+            "result": 28
+          }, 
+          "is_highlighted": false, 
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+          "unique_hash": "gcd_f5", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 15, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
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+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n"
+          ]
+        }, 
+        {
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+          "encoded_locals": {
+            "y": 28, 
+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "y": 21, 
+            "x": 28, 
+            "depth": 2, 
+            "indent": "****", 
+            "result": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f3", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 4, 
+          "encoded_locals": {
+            "y": 7, 
+            "x": 21, 
+            "depth": 3, 
+            "indent": "******", 
+            "result": 21
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f4", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 5, 
+          "encoded_locals": {
+            "y": 0, 
+            "x": 7, 
+            "depth": 4, 
+            "result": 7, 
+            "__return__": 7
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f5", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 15, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 28, 
+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "y": 21, 
+            "x": 28, 
+            "depth": 2, 
+            "indent": "****", 
+            "result": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f3", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 4, 
+          "encoded_locals": {
+            "y": 7, 
+            "x": 21, 
+            "depth": 3, 
+            "indent": "******", 
+            "result": 7
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f4", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 14, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 28, 
+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "y": 21, 
+            "x": 28, 
+            "depth": 2, 
+            "indent": "****", 
+            "result": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f3", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 4, 
+          "encoded_locals": {
+            "y": 7, 
+            "x": 21, 
+            "depth": 3, 
+            "indent": "******", 
+            "result": 7
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f4", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 15, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 28, 
+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "y": 21, 
+            "x": 28, 
+            "depth": 2, 
+            "indent": "****", 
+            "result": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f3", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 4, 
+          "encoded_locals": {
+            "indent": "******", 
+            "__return__": 7, 
+            "depth": 3, 
+            "result": 7, 
+            "y": 7, 
+            "x": 21
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f4", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 15, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 28, 
+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
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+          "encoded_locals": {
+            "y": 21, 
+            "x": 28, 
+            "depth": 2, 
+            "indent": "****", 
+            "result": 7
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f3", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
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+          "FUNCTION", 
+          "gcd(x, y, depth)", 
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+        ], 
+        "2": [
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+          "main()", 
+          null
+        ]
+      }, 
+      "line": 14, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 28, 
+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "y": 21, 
+            "x": 28, 
+            "depth": 2, 
+            "indent": "****", 
+            "result": 7
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f3", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
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+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
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+          "main()", 
+          null
+        ]
+      }, 
+      "line": 15, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 28, 
+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 77
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "indent": "****", 
+            "__return__": 7, 
+            "depth": 2, 
+            "result": 7, 
+            "y": 21, 
+            "x": 28
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f3", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 15, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 28, 
+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 7
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 14, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n** result is 7\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "y": 28, 
+            "x": 77, 
+            "depth": 1, 
+            "indent": "**", 
+            "result": 7
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 15, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n** result is 7\n", 
+      "func_name": "gcd", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "n": 28
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "indent": "**", 
+            "__return__": 7, 
+            "depth": 1, 
+            "result": 7, 
+            "y": 28, 
+            "x": 77
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gcd", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gcd_f2", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "depth", 
+            "result", 
+            "indent", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 15, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n** result is 7\n", 
+      "func_name": "main", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "g": 7, 
+            "n": 28
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n", 
+            "g"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 22, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n** result is 7\n", 
+      "func_name": "main", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "m": 77, 
+            "g": 7, 
+            "n": 28
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n", 
+            "g"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 23, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n** result is 7\nGreatest common divisor of 77, 28 = 7\n", 
+      "func_name": "main", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": null, 
+            "m": 77, 
+            "g": 7, 
+            "n": 28
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "main", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "main_f1", 
+          "ordered_varnames": [
+            "m", 
+            "n", 
+            "g", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 23, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "gcd", 
+        "main"
+      ], 
+      "stdout": "Finding gcd(77, 28)\n** About to recursively call gcd(28, 21)\n**** About to recursively call gcd(21, 7)\n****** About to recursively call gcd(7, 0)\n****** result is 7\n**** result is 7\n** result is 7\nGreatest common divisor of 77, 28 = 7\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "main": [
+          "REF", 
+          2
+        ], 
+        "gcd": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gcd(x, y, depth)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "main()", 
+          null
+        ]
+      }, 
+      "line": 25, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/example-code/wentworth_sumList.golden_py3 b/v3/example-code/wentworth_sumList.golden_py3
new file mode 100644
index 000000000..8809705d3
--- /dev/null
+++ b/v3/example-code/wentworth_sumList.golden_py3
@@ -0,0 +1,4520 @@
+{
+  "code": "# Tutorial code from Prof. Peter Wentworth\n# Rhodes University, South Africa (http://www.ru.ac.za/)\n\ndef sumList(xs):\n    '''\n    Sum a list that can contain nested lists.\n    Precondition: All leaf elements are numbers.\n    '''\n    sum = 0\n    for e in xs:\n        if type(e) is list:\n            print((\"Calling sumList(%s) recursively\" % e))\n            v = sumList(e)\n            print((\"sumList(%s) returned %s\" % (e, v)))\n            sum += v\n        else:\n            sum += e\n    return sum\n\n\ntestData = [10, [20, 30, [40], 50], 60]\nprint((\"Calling sumList(%s)\" % testData))\nresult = sumList(testData)\nprint((\"Final sum of all numbers in initial list is %s\" % result))\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ]
+      }, 
+      "line": 21, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 22, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 23, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 0
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 0, 
+            "e": 10
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 0, 
+            "e": 10
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 17, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": 10
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
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+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
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+          [
+            "REF", 
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+          ], 
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+        ], 
+        "3": [
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+          [
+            "REF", 
+            4
+          ], 
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+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 12, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 13, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 0
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
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+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 0, 
+            "e": 20
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
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+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
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+          30, 
+          [
+            "REF", 
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+          ], 
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+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 0, 
+            "e": 20
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
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+          [
+            "REF", 
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+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 17, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 20, 
+            "e": 20
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
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+          [
+            "REF", 
+            3
+          ], 
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+        ], 
+        "3": [
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+        "4": [
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+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 20, 
+            "e": 30
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
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+            "REF", 
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+          ], 
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+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 20, 
+            "e": 30
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
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+          [
+            "REF", 
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+        "3": [
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+            "REF", 
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+        "4": [
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+        ]
+      }, 
+      "line": 17, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": 30
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 12, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 13, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f3", 
+          "ordered_varnames": [
+            "xs"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f3", 
+          "ordered_varnames": [
+            "xs"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              4
+            ], 
+            "sum": 0
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f3", 
+          "ordered_varnames": [
+            "xs", 
+            "sum"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              4
+            ], 
+            "sum": 0, 
+            "e": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f3", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              4
+            ], 
+            "sum": 0, 
+            "e": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f3", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 17, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              4
+            ], 
+            "sum": 40, 
+            "e": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f3", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              4
+            ], 
+            "sum": 40, 
+            "e": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f3", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 18, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "__return__": 40, 
+            "xs": [
+              "REF", 
+              4
+            ], 
+            "sum": 40, 
+            "e": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f3", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 18, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ], 
+            "v": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 14, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 50, 
+            "e": [
+              "REF", 
+              4
+            ], 
+            "v": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 15, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 90, 
+            "e": [
+              "REF", 
+              4
+            ], 
+            "v": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 90, 
+            "e": 50, 
+            "v": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 90, 
+            "e": 50, 
+            "v": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 17, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 140, 
+            "e": 50, 
+            "v": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 140, 
+            "e": 50, 
+            "v": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 18, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": 140, 
+            "xs": [
+              "REF", 
+              3
+            ], 
+            "sum": 140, 
+            "e": 50, 
+            "v": 40
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f2", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 18, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ], 
+            "v": 140
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 14, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 10, 
+            "e": [
+              "REF", 
+              3
+            ], 
+            "v": 140
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 15, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 150, 
+            "e": [
+              "REF", 
+              3
+            ], 
+            "v": 140
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 150, 
+            "e": 60, 
+            "v": 140
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 150, 
+            "e": 60, 
+            "v": 140
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 17, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 210, 
+            "e": 60, 
+            "v": 140
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 210, 
+            "e": 60, 
+            "v": 140
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 18, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\n", 
+      "func_name": "sumList", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": 210, 
+            "xs": [
+              "REF", 
+              2
+            ], 
+            "sum": 210, 
+            "e": 60, 
+            "v": 140
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "sumList", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "sumList_f1", 
+          "ordered_varnames": [
+            "xs", 
+            "sum", 
+            "e", 
+            "v", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 18, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData", 
+        "result"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "result": 210, 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 24, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "sumList", 
+        "testData", 
+        "result"
+      ], 
+      "stdout": "Calling sumList([10, [20, 30, [40], 50], 60])\nCalling sumList([20, 30, [40], 50]) recursively\nCalling sumList([40]) recursively\nsumList([40]) returned 40\nsumList([20, 30, [40], 50]) returned 140\nFinal sum of all numbers in initial list is 210\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "testData": [
+          "REF", 
+          2
+        ], 
+        "result": 210, 
+        "sumList": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "sumList(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          [
+            "REF", 
+            3
+          ], 
+          60
+        ], 
+        "3": [
+          "LIST", 
+          20, 
+          30, 
+          [
+            "REF", 
+            4
+          ], 
+          50
+        ], 
+        "4": [
+          "LIST", 
+          40
+        ]
+      }, 
+      "line": 24, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/example-code/wentworth_try_finally.golden_py3 b/v3/example-code/wentworth_try_finally.golden_py3
new file mode 100644
index 000000000..881592050
--- /dev/null
+++ b/v3/example-code/wentworth_try_finally.golden_py3
@@ -0,0 +1,2823 @@
+{
+  "code": "# Tutorial code from Prof. Peter Wentworth\n# Rhodes University, South Africa (http://www.ru.ac.za/)\n\n# Demonstrate recursion that throws an exception\n# at its base case, and the tracing of try ... finally.\n#\n# How many \"survived!\" messages will be printed???\n\ndef f(n):\n    try:\n        x = 10 / n\n        print(\"x is \" + str(x))\n        f(n-1)\n        print(\"survived!\")\n    finally:\n        print(\"Bye from f where n = \" + str(n))\n\nf(4)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "f": [
+          "REF", 
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+        "f"
+      ], 
+      "stdout": "x is 2.5\nx is 3.3333333333333335\nx is 5.0\nx is 10.0\nBye from f where n = 0\nBye from f where n = 1\nBye from f where n = 2\nBye from f where n = 3\n", 
+      "exception_msg": "ZeroDivisionError: division by zero", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 2.500, 
+            "n": 4
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 13, 
+      "event": "exception"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2.5\nx is 3.3333333333333335\nx is 5.0\nx is 10.0\nBye from f where n = 0\nBye from f where n = 1\nBye from f where n = 2\nBye from f where n = 3\n", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 2.500, 
+            "n": 4
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n", 
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 16, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2.5\nx is 3.3333333333333335\nx is 5.0\nx is 10.0\nBye from f where n = 0\nBye from f where n = 1\nBye from f where n = 2\nBye from f where n = 3\nBye from f where n = 4\n", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": null, 
+            "x": 2.500, 
+            "n": 4
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "n", 
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 16, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "x is 2.5\nx is 3.3333333333333335\nx is 5.0\nx is 10.0\nBye from f where n = 0\nBye from f where n = 1\nBye from f where n = 2\nBye from f where n = 3\nBye from f where n = 4\n", 
+      "exception_msg": "ZeroDivisionError: division by zero", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(n)", 
+          null
+        ]
+      }, 
+      "line": 18, 
+      "event": "exception"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/caught_exception_1.golden_py3 b/v3/tests/backend-tests/caught_exception_1.golden_py3
new file mode 100644
index 000000000..b9d796a10
--- /dev/null
+++ b/v3/tests/backend-tests/caught_exception_1.golden_py3
@@ -0,0 +1,66 @@
+{
+  "code": "try:\n  x = 1 / 0\nexcept:\n  print(\"DIVIDE BY ZERO\")\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "exception_msg": "ZeroDivisionError: division by zero", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "exception"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "DIVIDE BY ZERO\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 4, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/caught_exception_2.golden_py3 b/v3/tests/backend-tests/caught_exception_2.golden_py3
new file mode 100644
index 000000000..c0fb9edc3
--- /dev/null
+++ b/v3/tests/backend-tests/caught_exception_2.golden_py3
@@ -0,0 +1,77 @@
+{
+  "code": "# caught exception:\ntry:\n  x = 1 / 0\nexcept:\n  print(\"DIVIDE BY ZERO\")\n\n\n# uncaught:\nprint(y)\n\nprint(\"should not reach here\")\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "exception_msg": "ZeroDivisionError: division by zero", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "exception"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "DIVIDE BY ZERO\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "DIVIDE BY ZERO\n", 
+      "exception_msg": "NameError: name 'y' is not defined", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 9, 
+      "event": "exception"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/circ_ref.golden_py3 b/v3/tests/backend-tests/circ_ref.golden_py3
new file mode 100644
index 000000000..ea8bc5c65
--- /dev/null
+++ b/v3/tests/backend-tests/circ_ref.golden_py3
@@ -0,0 +1,65 @@
+{
+  "code": "# true circular reference\n\nx = [1, 2]\nx.append(x)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2, 
+          [
+            "REF", 
+            1
+          ]
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/circ_ref_2.golden_py3 b/v3/tests/backend-tests/circ_ref_2.golden_py3
new file mode 100644
index 000000000..c1fb56894
--- /dev/null
+++ b/v3/tests/backend-tests/circ_ref_2.golden_py3
@@ -0,0 +1,116 @@
+{
+  "code": "# true indirect circular reference\n\nx = [1, 2]\ny = [3, 4, x]\nx.append(y)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          2
+        ], 
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2
+        ], 
+        "2": [
+          "LIST", 
+          3, 
+          4, 
+          [
+            "REF", 
+            1
+          ]
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          2
+        ], 
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2, 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          3, 
+          4, 
+          [
+            "REF", 
+            1
+          ]
+        ]
+      }, 
+      "line": 5, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/circ_ref_fake.golden_py3 b/v3/tests/backend-tests/circ_ref_fake.golden_py3
new file mode 100644
index 000000000..11e8e7d50
--- /dev/null
+++ b/v3/tests/backend-tests/circ_ref_fake.golden_py3
@@ -0,0 +1,168 @@
+{
+  "code": "# not a true circular reference\n\na = [10, 20, 30]\nb = a\nc = [10, 20, 30]\nd = (a, b, c)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "a"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "a", 
+        "b"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ], 
+        "b": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "a", 
+        "b", 
+        "c"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ], 
+        "c": [
+          "REF", 
+          2
+        ], 
+        "b": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "a", 
+        "b", 
+        "c", 
+        "d"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ], 
+        "c": [
+          "REF", 
+          2
+        ], 
+        "b": [
+          "REF", 
+          1
+        ], 
+        "d": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ], 
+        "3": [
+          "TUPLE", 
+          [
+            "REF", 
+            1
+          ], 
+          [
+            "REF", 
+            1
+          ], 
+          [
+            "REF", 
+            2
+          ]
+        ]
+      }, 
+      "line": 6, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/class_test.golden_py3 b/v3/tests/backend-tests/class_test.golden_py3
new file mode 100644
index 000000000..5d77aed91
--- /dev/null
+++ b/v3/tests/backend-tests/class_test.golden_py3
@@ -0,0 +1,2671 @@
+{
+  "code": "class Point:\n    def __init__(self, x, y):\n        self.x = x\n        self.y = y\n    \n    def __str__(self):\n        return \"(%d, %d)\" % (self.x, self.y)\n\np = Point(1, 2)\nprint(p)\np2 = Point(3, -4)\nprint(p2)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Point", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Point", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Point_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Point", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Point", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Point_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Point", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Point", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Point_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Point", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__init__": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "Point", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Point_f1_p", 
+          "ordered_varnames": [
+            "__init__"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "__init__", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "2": [
+          "FUNCTION", 
+          "__init__(self, x, y)", 
+          1
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Point", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              1
+            ], 
+            "__str__": [
+              "REF", 
+              3
+            ], 
+            "__init__": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "Point", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Point_f1_p", 
+          "ordered_varnames": [
+            "__init__", 
+            "__str__", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "2": [
+          "FUNCTION", 
+          "__init__(self, x, y)", 
+          1
+        ], 
+        "3": [
+          "FUNCTION", 
+          "__str__(self)", 
+          1
+        ]
+      }, 
+      "line": 6, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "Point"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              1
+            ], 
+            "__str__": [
+              "REF", 
+              3
+            ], 
+            "__init__": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Point", 
+          "is_zombie": true, 
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+            "self", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "p2": [
+          "REF", 
+          6
+        ], 
+        "p": [
+          "REF", 
+          5
+        ], 
+        "Point": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "2": [
+          "FUNCTION", 
+          "__init__(self, x, y)", 
+          1
+        ], 
+        "3": [
+          "FUNCTION", 
+          "__str__(self)", 
+          1
+        ], 
+        "4": [
+          "CLASS", 
+          "Point", 
+          [], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "5": [
+          "INSTANCE", 
+          "Point", 
+          [
+            "x", 
+            1
+          ], 
+          [
+            "y", 
+            2
+          ]
+        ], 
+        "6": [
+          "INSTANCE", 
+          "Point", 
+          [
+            "x", 
+            3
+          ], 
+          [
+            "y", 
+            -4
+          ]
+        ]
+      }, 
+      "line": 7, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "Point", 
+        "p", 
+        "p2"
+      ], 
+      "stdout": "(1, 2)\n(3, -4)\n", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              1
+            ], 
+            "__str__": [
+              "REF", 
+              3
+            ], 
+            "__init__": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "Point", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Point_f1_p_z", 
+          "ordered_varnames": [
+            "__init__", 
+            "__str__", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "p2": [
+          "REF", 
+          6
+        ], 
+        "p": [
+          "REF", 
+          5
+        ], 
+        "Point": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              2
+            ]
+          ]
+        ], 
+        "2": [
+          "FUNCTION", 
+          "__init__(self, x, y)", 
+          1
+        ], 
+        "3": [
+          "FUNCTION", 
+          "__str__(self)", 
+          1
+        ], 
+        "4": [
+          "CLASS", 
+          "Point", 
+          [], 
+          [
+            "__init__", 
+            [
+              "REF", 
+              2
+            ]
+          ], 
+          [
+            "__str__", 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "5": [
+          "INSTANCE", 
+          "Point", 
+          [
+            "x", 
+            1
+          ], 
+          [
+            "y", 
+            2
+          ]
+        ], 
+        "6": [
+          "INSTANCE", 
+          "Point", 
+          [
+            "x", 
+            3
+          ], 
+          [
+            "y", 
+            -4
+          ]
+        ]
+      }, 
+      "line": 12, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/class_test_2.golden_py3 b/v3/tests/backend-tests/class_test_2.golden_py3
new file mode 100644
index 000000000..4b69e54da
--- /dev/null
+++ b/v3/tests/backend-tests/class_test_2.golden_py3
@@ -0,0 +1,297 @@
+{
+  "code": "class Outer():\n   pass\n\no = Outer()\no.a = 5\no.b = \"Hi\"\nprint(o)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Outer", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Outer", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Outer_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Outer", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Outer", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Outer_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Outer", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Outer", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Outer_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Outer", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              1
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Outer", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Outer_f1", 
+          "ordered_varnames": [
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 2, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "Outer"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Outer": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Outer", 
+          []
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Outer", 
+        "o"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Outer": [
+          "REF", 
+          2
+        ], 
+        "o": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Outer", 
+          []
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Outer"
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Outer", 
+        "o"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Outer": [
+          "REF", 
+          2
+        ], 
+        "o": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Outer", 
+          []
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Outer", 
+          [
+            "a", 
+            5
+          ]
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Outer", 
+        "o"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Outer": [
+          "REF", 
+          2
+        ], 
+        "o": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Outer", 
+          []
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Outer", 
+          [
+            "a", 
+            5
+          ], 
+          [
+            "b", 
+            "Hi"
+          ]
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Outer", 
+        "o"
+      ], 
+      "stdout": "<__main__.Outer object at 0xADDR>\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Outer": [
+          "REF", 
+          2
+        ], 
+        "o": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Outer", 
+          []
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Outer", 
+          [
+            "a", 
+            5
+          ], 
+          [
+            "b", 
+            "Hi"
+          ]
+        ]
+      }, 
+      "line": 7, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/class_test_3.golden_py3 b/v3/tests/backend-tests/class_test_3.golden_py3
new file mode 100644
index 000000000..81a87f39f
--- /dev/null
+++ b/v3/tests/backend-tests/class_test_3.golden_py3
@@ -0,0 +1,673 @@
+{
+  "code": "class Staff601:\n    course = '6.01'\n    building = 34\n    room = 501\n\npat = Staff601()\nprint(pat.course)\n\npat.name = 'Pat'\npat.age = 60\npat.role = 'Professor'\n\nprint(pat.building)\npat.building = 32\nprint(pat.building)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "course": "6.01"
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": [
+            "course"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "course", 
+            "6.01"
+          ]
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "course": "6.01"
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": [
+            "building", 
+            "course"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ]
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "Staff601", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "building": 34, 
+            "course": "6.01", 
+            "room": 501, 
+            "__return__": [
+              "REF", 
+              1
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "Staff601", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "Staff601_f1", 
+          "ordered_varnames": [
+            "building", 
+            "course", 
+            "room", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "room", 
+            501
+          ], 
+          [
+            "course", 
+            "6.01"
+          ]
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          2
+        ], 
+        "pat": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Staff601"
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          2
+        ], 
+        "pat": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Staff601"
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          2
+        ], 
+        "pat": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "name", 
+            "Pat"
+          ]
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          2
+        ], 
+        "pat": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "name", 
+            "Pat"
+          ]
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          2
+        ], 
+        "pat": [
+          "REF", 
+          3
+        ]
+      }, 
+      "heap": {
+        "2": [
+          "CLASS", 
+          "Staff601", 
+          [], 
+          [
+            "building", 
+            34
+          ], 
+          [
+            "course", 
+            "6.01"
+          ], 
+          [
+            "room", 
+            501
+          ]
+        ], 
+        "3": [
+          "INSTANCE", 
+          "Staff601", 
+          [
+            "age", 
+            60
+          ], 
+          [
+            "name", 
+            "Pat"
+          ], 
+          [
+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 13, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
+        "pat"
+      ], 
+      "stdout": "6.01\n34\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "Staff601": [
+          "REF", 
+          2
+        ], 
+        "pat": [
+          "REF", 
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+          ]
+        ], 
+        "3": [
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+          [
+            "age", 
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+          ], 
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+            "name", 
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+          ], 
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+            "role", 
+            "Professor"
+          ]
+        ]
+      }, 
+      "line": 14, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "Staff601", 
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+      ], 
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+      "event": "step_line"
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+}
diff --git a/v3/tests/backend-tests/closure-shadow-same-name.golden_py3 b/v3/tests/backend-tests/closure-shadow-same-name.golden_py3
new file mode 100644
index 000000000..5f17e5c8b
--- /dev/null
+++ b/v3/tests/backend-tests/closure-shadow-same-name.golden_py3
@@ -0,0 +1,505 @@
+{
+  "code": "# some of the params in f and g have identical names AND values,\n# so make sure they're all displayed properly\ndef f(x, y, z):\n  def g(x, y):\n    return x\n  return g(x, y)\n\nf(1, 2, 3)\n", 
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+  ]
+}
diff --git a/v3/tests/backend-tests/data_test.golden_py3 b/v3/tests/backend-tests/data_test.golden_py3
new file mode 100644
index 000000000..68e3251eb
--- /dev/null
+++ b/v3/tests/backend-tests/data_test.golden_py3
@@ -0,0 +1,213 @@
+{
+  "code": "x = ('hello', 'world', 1, 2, 3, 'goodbye')\ny = list(x)\nz = set(x)\nw = {\"joe\" : 5, \"mindy\" : 6, \"jack\" : 7}\n", 
+  "trace": [
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+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
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+        "2": [
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+        ], 
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+          "SET", 
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+          2, 
+          3, 
+          "goodbye", 
+          "world", 
+          "hello"
+        ], 
+        "4": [
+          "DICT", 
+          [
+            "mindy", 
+            6
+          ], 
+          [
+            "joe", 
+            5
+          ], 
+          [
+            "jack", 
+            7
+          ]
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
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+  ]
+}
diff --git a/v3/tests/backend-tests/dict_error.golden_py3 b/v3/tests/backend-tests/dict_error.golden_py3
new file mode 100644
index 000000000..1d65cbe41
--- /dev/null
+++ b/v3/tests/backend-tests/dict_error.golden_py3
@@ -0,0 +1,207 @@
+{
+  "code": "def foo():\n  local_y[('tup', 'le')] = set([1, 2, 3])\n\nfoo()\n", 
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+        {
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+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "exception"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": null
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "foo"
+      ], 
+      "stdout": "", 
+      "exception_msg": "NameError: global name 'local_y' is not defined", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "foo": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "exception"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/dict_test.golden_py3 b/v3/tests/backend-tests/dict_test.golden_py3
new file mode 100644
index 000000000..cb382cbf5
--- /dev/null
+++ b/v3/tests/backend-tests/dict_test.golden_py3
@@ -0,0 +1,730 @@
+{
+  "code": "x = {1 : 2}\nx[('tup', 'le')] = set([1, 2, 3])\n\ndef foo():\n  local_x = {1 : 2}\n  local_y = {}\n  local_y[('tup', 'le')] = set([1, 2, 3])\n  print(\"hello\", list(local_y.values()))\n\nfoo()\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ]
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "foo": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "foo": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "foo": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "local_x": [
+              "REF", 
+              5
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "local_x"
+          ]
+        }
+      ], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "foo": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ], 
+        "5": [
+          "DICT", 
+          [
+            1, 
+            2
+          ]
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "local_y": [
+              "REF", 
+              6
+            ], 
+            "local_x": [
+              "REF", 
+              5
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "local_x", 
+            "local_y"
+          ]
+        }
+      ], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "foo": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ], 
+        "5": [
+          "DICT", 
+          [
+            1, 
+            2
+          ]
+        ], 
+        "6": [
+          "DICT"
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "foo"
+      ], 
+      "stdout": "", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "local_y": [
+              "REF", 
+              6
+            ], 
+            "local_x": [
+              "REF", 
+              5
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "local_x", 
+            "local_y"
+          ]
+        }
+      ], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "foo": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ], 
+        "5": [
+          "DICT", 
+          [
+            1, 
+            2
+          ]
+        ], 
+        "6": [
+          "DICT", 
+          [
+            [
+              "REF", 
+              7
+            ], 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
+        "7": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "8": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "foo"
+      ], 
+      "stdout": "hello [{1, 2, 3}]\n", 
+      "func_name": "foo", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": null, 
+            "local_y": [
+              "REF", 
+              6
+            ], 
+            "local_x": [
+              "REF", 
+              5
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "foo", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "foo_f1", 
+          "ordered_varnames": [
+            "local_x", 
+            "local_y", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "foo": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ], 
+        "5": [
+          "DICT", 
+          [
+            1, 
+            2
+          ]
+        ], 
+        "6": [
+          "DICT", 
+          [
+            [
+              "REF", 
+              7
+            ], 
+            [
+              "REF", 
+              8
+            ]
+          ]
+        ], 
+        "7": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "8": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ]
+      }, 
+      "line": 8, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "foo"
+      ], 
+      "stdout": "hello [{1, 2, 3}]\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "foo": [
+          "REF", 
+          4
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            1, 
+            2
+          ], 
+          [
+            [
+              "REF", 
+              2
+            ], 
+            [
+              "REF", 
+              3
+            ]
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          "tup", 
+          "le"
+        ], 
+        "3": [
+          "SET", 
+          1, 
+          2, 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "foo()", 
+          null
+        ]
+      }, 
+      "line": 10, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/exec_test.golden_py3 b/v3/tests/backend-tests/exec_test.golden_py3
new file mode 100644
index 000000000..f8b44bb26
--- /dev/null
+++ b/v3/tests/backend-tests/exec_test.golden_py3
@@ -0,0 +1,26 @@
+{
+  "code": "exec(\"import os; os.system('echo security breach')\")\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "exception_msg": "NameError: name 'exec' is not defined", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "exception"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/func_exception.golden_py3 b/v3/tests/backend-tests/func_exception.golden_py3
new file mode 100644
index 000000000..537097da9
--- /dev/null
+++ b/v3/tests/backend-tests/func_exception.golden_py3
@@ -0,0 +1,270 @@
+{
+  "code": "def g(x,y):\n    print(\"In g\")\n    ans = x/y\n    return ans\n \ng(5, 0)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "g"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "g": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "g(x, y)", 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "g"
+      ], 
+      "stdout": "", 
+      "func_name": "g", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 0, 
+            "x": 5
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "g", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "g_f1", 
+          "ordered_varnames": [
+            "x", 
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "g": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "g(x, y)", 
+          null
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "g"
+      ], 
+      "stdout": "", 
+      "func_name": "g", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 0, 
+            "x": 5
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "g", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "g_f1", 
+          "ordered_varnames": [
+            "x", 
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "g": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "g(x, y)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "g"
+      ], 
+      "stdout": "In g\n", 
+      "func_name": "g", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 0, 
+            "x": 5
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "g", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "g_f1", 
+          "ordered_varnames": [
+            "x", 
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "g": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "g(x, y)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "g"
+      ], 
+      "stdout": "In g\n", 
+      "exception_msg": "ZeroDivisionError: division by zero", 
+      "func_name": "g", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 0, 
+            "x": 5
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "g", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "g_f1", 
+          "ordered_varnames": [
+            "x", 
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "g": [
+          "REF", 
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+      "ordered_globals": [
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+      "stdout": "In g\n", 
+      "func_name": "g", 
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+        ]
+      }, 
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+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "g"
+      ], 
+      "stdout": "In g\n", 
+      "exception_msg": "ZeroDivisionError: division by zero", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "g": [
+          "REF", 
+          1
+        ]
+      }, 
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+      }, 
+      "line": 6, 
+      "event": "exception"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/generator_test.golden_py3 b/v3/tests/backend-tests/generator_test.golden_py3
new file mode 100644
index 000000000..9a61882ef
--- /dev/null
+++ b/v3/tests/backend-tests/generator_test.golden_py3
@@ -0,0 +1,100 @@
+{
+  "code": "x = (e for e in range(10))\ny = x\nz = (e for e in range(10))\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "INSTANCE", 
+          "generator"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
+          "REF", 
+          1
+        ], 
+        "x": [
+          "REF", 
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+        ]
+      }, 
+      "heap": {
+        "1": [
+          "INSTANCE", 
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+      "line": 3, 
+      "event": "step_line"
+    }, 
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+      "ordered_globals": [
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+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": [
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+        "z": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "INSTANCE", 
+          "generator"
+        ], 
+        "2": [
+          "INSTANCE", 
+          "generator"
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/generator_use_test.golden_py3 b/v3/tests/backend-tests/generator_use_test.golden_py3
new file mode 100644
index 000000000..5bb2c43a8
--- /dev/null
+++ b/v3/tests/backend-tests/generator_use_test.golden_py3
@@ -0,0 +1,10772 @@
+{
+  "code": "def gen_odds():\n  x = 1\n  while True:\n    yield x\n    x += 2\n\nfor i in gen_odds():\n  print(i)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
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+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "gen_odds": [
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+      }, 
+      "heap": {
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+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds"
+      ], 
+      "stdout": "", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds"
+      ], 
+      "stdout": "", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds"
+      ], 
+      "stdout": "", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f1", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
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+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds"
+      ], 
+      "stdout": "", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "x": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f1", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
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+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds"
+      ], 
+      "stdout": "", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": 1, 
+            "x": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f1", 
+          "ordered_varnames": [
+            "x", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "gen_odds": [
+          "REF", 
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+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
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+          null
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "gen_odds": [
+          "REF", 
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+        ]
+      }, 
+      "heap": {
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+          null
+        ]
+      }, 
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 1
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+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f2", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
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+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f2", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "i": 1, 
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "gen_odds()", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 3
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
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+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f2", 
+          "ordered_varnames": [
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+          ]
+        }
+      ], 
+      "globals": {
+        "i": 1, 
+        "gen_odds": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
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+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
+        "i"
+      ], 
+      "stdout": "1\n", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": 3, 
+            "x": 3
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+          "is_highlighted": true, 
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+      ], 
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+        ]
+      }, 
+      "heap": {
+        "1": [
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+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
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+      ], 
+      "stdout": "1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 3, 
+        "gen_odds": [
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+        ]
+      }, 
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
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+      ], 
+      "stdout": "1\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 3, 
+        "gen_odds": [
+          "REF", 
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "gen_odds", 
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+      "stdout": "1\n3\n", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
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+          "frame_id": 3, 
+          "encoded_locals": {
+            "x": 3
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+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
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+      ], 
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+      "event": "call"
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+    {
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+      "stdout": "1\n3\n", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
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+      "func_name": "gen_odds", 
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+      "event": "step_line"
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+    {
+      "ordered_globals": [
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+      "stdout": "1\n3\n", 
+      "func_name": "gen_odds", 
+      "stack_to_render": [
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+          "encoded_locals": {
+            "__return__": 5, 
+            "x": 5
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+          "func_name": "gen_odds", 
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+          "unique_hash": "gen_odds_f3", 
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+      }, 
+      "line": 4, 
+      "event": "return"
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+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
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+      "event": "step_line"
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+      "func_name": "", 
+      "stack_to_render": [], 
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+      "func_name": "gen_odds", 
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+      "event": "call"
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+      "func_name": "gen_odds", 
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+      "func_name": "gen_odds", 
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+      "event": "step_line"
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+      "func_name": "gen_odds", 
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+          "frame_id": 50, 
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+            "x": 99
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "gen_odds", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "gen_odds_f50", 
+          "ordered_varnames": [
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+        }
+      ], 
+      "globals": {
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+      "heap": {
+        "1": [
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+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "exception_msg": "(stopped after 300 steps to prevent possible infinite loop)", 
+      "event": "instruction_limit_reached"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/import_error.golden_py3 b/v3/tests/backend-tests/import_error.golden_py3
new file mode 100644
index 000000000..05a889187
--- /dev/null
+++ b/v3/tests/backend-tests/import_error.golden_py3
@@ -0,0 +1,29 @@
+{
+  "code": "# should NOT allow for any imports\nimport os\n\nos.system(\"echo security breach\")\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "return"
+    }, 
+    {
+      "exception_msg": "ImportError: os not supported", 
+      "event": "uncaught_exception"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/infinite_loop.golden_py3 b/v3/tests/backend-tests/infinite_loop.golden_py3
new file mode 100644
index 000000000..ed5d62820
--- /dev/null
+++ b/v3/tests/backend-tests/infinite_loop.golden_py3
@@ -0,0 +1,7560 @@
+{
+  "code": "# Fibonacci!!!\n\narr = [1, 1]\n\nprint(arr[0])\n\nwhile True:\n  print(arr[-1])\n  tmp = sum(arr)\n  arr.append(tmp)\n  del arr[0]\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          1
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr"
+      ], 
+      "stdout": "1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          1
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
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+        ]
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n2\n3\n5\n8\n13\n21\n34\n55\n89\n144\n233\n377\n610\n987\n1597\n2584\n4181\n6765\n10946\n17711\n28657\n46368\n75025\n121393\n196418\n317811\n514229\n832040\n1346269\n2178309\n3524578\n5702887\n9227465\n14930352\n24157817\n39088169\n63245986\n102334155\n165580141\n267914296\n433494437\n701408733\n1134903170\n1836311903\n2971215073\n4807526976\n7778742049\n12586269025\n20365011074\n32951280099\n53316291173\n86267571272\n139583862445\n225851433717\n365435296162\n591286729879\n956722026041\n1548008755920\n2504730781961\n4052739537881\n6557470319842\n10610209857723\n17167680177565\n27777890035288\n44945570212853\n72723460248141\n117669030460994\n190392490709135\n308061521170129\n498454011879264\n806515533049393\n1304969544928657\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 2111485077978050, 
+        "arr": [
+          "REF", 
+          1
+        ]
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+          "LIST", 
+          1304969544928657, 
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+        ]
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+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n2\n3\n5\n8\n13\n21\n34\n55\n89\n144\n233\n377\n610\n987\n1597\n2584\n4181\n6765\n10946\n17711\n28657\n46368\n75025\n121393\n196418\n317811\n514229\n832040\n1346269\n2178309\n3524578\n5702887\n9227465\n14930352\n24157817\n39088169\n63245986\n102334155\n165580141\n267914296\n433494437\n701408733\n1134903170\n1836311903\n2971215073\n4807526976\n7778742049\n12586269025\n20365011074\n32951280099\n53316291173\n86267571272\n139583862445\n225851433717\n365435296162\n591286729879\n956722026041\n1548008755920\n2504730781961\n4052739537881\n6557470319842\n10610209857723\n17167680177565\n27777890035288\n44945570212853\n72723460248141\n117669030460994\n190392490709135\n308061521170129\n498454011879264\n806515533049393\n1304969544928657\n2111485077978050\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 2111485077978050, 
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1304969544928657, 
+          2111485077978050
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+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n2\n3\n5\n8\n13\n21\n34\n55\n89\n144\n233\n377\n610\n987\n1597\n2584\n4181\n6765\n10946\n17711\n28657\n46368\n75025\n121393\n196418\n317811\n514229\n832040\n1346269\n2178309\n3524578\n5702887\n9227465\n14930352\n24157817\n39088169\n63245986\n102334155\n165580141\n267914296\n433494437\n701408733\n1134903170\n1836311903\n2971215073\n4807526976\n7778742049\n12586269025\n20365011074\n32951280099\n53316291173\n86267571272\n139583862445\n225851433717\n365435296162\n591286729879\n956722026041\n1548008755920\n2504730781961\n4052739537881\n6557470319842\n10610209857723\n17167680177565\n27777890035288\n44945570212853\n72723460248141\n117669030460994\n190392490709135\n308061521170129\n498454011879264\n806515533049393\n1304969544928657\n2111485077978050\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 3416454622906707, 
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
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+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n2\n3\n5\n8\n13\n21\n34\n55\n89\n144\n233\n377\n610\n987\n1597\n2584\n4181\n6765\n10946\n17711\n28657\n46368\n75025\n121393\n196418\n317811\n514229\n832040\n1346269\n2178309\n3524578\n5702887\n9227465\n14930352\n24157817\n39088169\n63245986\n102334155\n165580141\n267914296\n433494437\n701408733\n1134903170\n1836311903\n2971215073\n4807526976\n7778742049\n12586269025\n20365011074\n32951280099\n53316291173\n86267571272\n139583862445\n225851433717\n365435296162\n591286729879\n956722026041\n1548008755920\n2504730781961\n4052739537881\n6557470319842\n10610209857723\n17167680177565\n27777890035288\n44945570212853\n72723460248141\n117669030460994\n190392490709135\n308061521170129\n498454011879264\n806515533049393\n1304969544928657\n2111485077978050\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 3416454622906707, 
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1304969544928657, 
+          2111485077978050, 
+          3416454622906707
+        ]
+      }, 
+      "line": 11, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "arr", 
+        "tmp"
+      ], 
+      "stdout": "1\n1\n2\n3\n5\n8\n13\n21\n34\n55\n89\n144\n233\n377\n610\n987\n1597\n2584\n4181\n6765\n10946\n17711\n28657\n46368\n75025\n121393\n196418\n317811\n514229\n832040\n1346269\n2178309\n3524578\n5702887\n9227465\n14930352\n24157817\n39088169\n63245986\n102334155\n165580141\n267914296\n433494437\n701408733\n1134903170\n1836311903\n2971215073\n4807526976\n7778742049\n12586269025\n20365011074\n32951280099\n53316291173\n86267571272\n139583862445\n225851433717\n365435296162\n591286729879\n956722026041\n1548008755920\n2504730781961\n4052739537881\n6557470319842\n10610209857723\n17167680177565\n27777890035288\n44945570212853\n72723460248141\n117669030460994\n190392490709135\n308061521170129\n498454011879264\n806515533049393\n1304969544928657\n2111485077978050\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "tmp": 3416454622906707, 
+        "arr": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          2111485077978050, 
+          3416454622906707
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "exception_msg": "(stopped after 300 steps to prevent possible infinite loop)", 
+      "event": "instruction_limit_reached"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/infinite_loop_one_liner.golden_py3 b/v3/tests/backend-tests/infinite_loop_one_liner.golden_py3
new file mode 100644
index 000000000..e28f84304
--- /dev/null
+++ b/v3/tests/backend-tests/infinite_loop_one_liner.golden_py3
@@ -0,0 +1,3009 @@
+{
+  "code": "while 1:\n  print(\"hahahaha\")\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "hahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\nhahahaha\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
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+      "event": "instruction_limit_reached"
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+}
diff --git a/v3/tests/backend-tests/john-compose.golden_py3 b/v3/tests/backend-tests/john-compose.golden_py3
new file mode 100644
index 000000000..9acb62b04
--- /dev/null
+++ b/v3/tests/backend-tests/john-compose.golden_py3
@@ -0,0 +1,1262 @@
+{
+  "code": "def compose1(f, g):\n  return lambda x: f(g(x))\n\nadd_one_and_square = compose1(lambda x: x * x, lambda x: x + 1)\nresult = add_one_and_square(12)\n", 
+  "trace": [
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+}
diff --git a/v3/tests/backend-tests/john-import-test.golden_py3 b/v3/tests/backend-tests/john-import-test.golden_py3
new file mode 100644
index 000000000..332fa4b5e
--- /dev/null
+++ b/v3/tests/backend-tests/john-import-test.golden_py3
@@ -0,0 +1,282 @@
+{
+  "code": "import math\nimport operator\nimport string\nimport collections\nimport re\nimport json\n\n# causes some errors in regression tests, but fine in GAE ...\n#import random\n#import datetime\n#import functools\n", 
+  "trace": [
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+      "func_name": "", 
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+      ], 
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+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
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+      ], 
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+      "ordered_globals": [
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+        "json"
+      ], 
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+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "string": [
+          "REF", 
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+        ], 
+        "re": [
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+        ], 
+        "json": [
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+        ], 
+        "collections": [
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+        ], 
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+        ]
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+}
diff --git a/v3/tests/backend-tests/lambda_1.golden_py3 b/v3/tests/backend-tests/lambda_1.golden_py3
new file mode 100644
index 000000000..947c90d9d
--- /dev/null
+++ b/v3/tests/backend-tests/lambda_1.golden_py3
@@ -0,0 +1,5493 @@
+{
+  "code": "def summation(low, high, f, next):\n  s = 0\n  x = low\n  while x <= high:\n    s = s + f(x)\n    x = next(x)\n  return s\n\ndef sumsquares(low, high):\n  return summation(low, high, lambda x: x**2, lambda x: x+1)\n\nprint(sumsquares(1, 5))\n", 
+  "trace": [
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+      "ordered_globals": [], 
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+        "summation", 
+        "sumsquares"
+      ], 
+      "stdout": "", 
+      "func_name": "sumsquares", 
+      "stack_to_render": [
+        {
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+          "unique_hash": "sumsquares_f1", 
+          "ordered_varnames": [
+            "low", 
+            "high"
+          ]
+        }
+      ], 
+      "globals": {
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+        ]
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+      "event": "call"
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+    {
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+        "summation", 
+        "sumsquares"
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+      "func_name": "sumsquares", 
+      "stack_to_render": [
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+          "unique_hash": "sumsquares_f1", 
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+          ]
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+      ], 
+      "globals": {
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+      ], 
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+      ], 
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+          "encoded_locals": {
+            "f": [
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+              4
+            ], 
+            "next": [
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diff --git a/v3/tests/backend-tests/ling-scheme-1.golden_py3 b/v3/tests/backend-tests/ling-scheme-1.golden_py3
new file mode 100644
index 000000000..a775366a0
--- /dev/null
+++ b/v3/tests/backend-tests/ling-scheme-1.golden_py3
@@ -0,0 +1,4020 @@
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diff --git a/v3/tests/backend-tests/ling-scheme-2.golden_py3 b/v3/tests/backend-tests/ling-scheme-2.golden_py3
new file mode 100644
index 000000000..add7f461f
--- /dev/null
+++ b/v3/tests/backend-tests/ling-scheme-2.golden_py3
@@ -0,0 +1,3788 @@
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diff --git a/v3/tests/backend-tests/ling-scheme-3.golden_py3 b/v3/tests/backend-tests/ling-scheme-3.golden_py3
new file mode 100644
index 000000000..d9ef80599
--- /dev/null
+++ b/v3/tests/backend-tests/ling-scheme-3.golden_py3
@@ -0,0 +1,8612 @@
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+        "pairs": [
+          "REF", 
+          3
+        ], 
+        "append": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "map(f, xs)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "append(xs, ys)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "pairs(xs)", 
+          null
+        ], 
+        "4": [
+          "LIST", 
+          1, 
+          2, 
+          3
+        ], 
+        "7": [
+          "LIST", 
+          1, 
+          2
+        ], 
+        "9": [
+          "LIST", 
+          1, 
+          3
+        ], 
+        "17": [
+          "LIST", 
+          2, 
+          3
+        ], 
+        "28": [
+          "LIST", 
+          [
+            "REF", 
+            7
+          ], 
+          [
+            "REF", 
+            9
+          ], 
+          [
+            "REF", 
+            17
+          ]
+        ]
+      }, 
+      "line": 19, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "map", 
+        "append", 
+        "pairs", 
+        "result"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": [
+              "REF", 
+              28
+            ], 
+            "xs": [
+              "REF", 
+              4
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "pairs", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "pairs_f1_p_z", 
+          "ordered_varnames": [
+            "xs", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "map": [
+          "REF", 
+          1
+        ], 
+        "pairs": [
+          "REF", 
+          3
+        ], 
+        "result": [
+          "REF", 
+          28
+        ], 
+        "append": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "map(f, xs)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "append(xs, ys)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "pairs(xs)", 
+          null
+        ], 
+        "4": [
+          "LIST", 
+          1, 
+          2, 
+          3
+        ], 
+        "7": [
+          "LIST", 
+          1, 
+          2
+        ], 
+        "9": [
+          "LIST", 
+          1, 
+          3
+        ], 
+        "17": [
+          "LIST", 
+          2, 
+          3
+        ], 
+        "28": [
+          "LIST", 
+          [
+            "REF", 
+            7
+          ], 
+          [
+            "REF", 
+            9
+          ], 
+          [
+            "REF", 
+            17
+          ]
+        ]
+      }, 
+      "line": 21, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/list_dict_test.golden_py3 b/v3/tests/backend-tests/list_dict_test.golden_py3
new file mode 100644
index 000000000..4baefb4f5
--- /dev/null
+++ b/v3/tests/backend-tests/list_dict_test.golden_py3
@@ -0,0 +1,416 @@
+{
+  "code": "x = {}\nl = ['hello', \"world\", 'goodbye']\nfor (i, e) in enumerate(l):\n    x[e] = i\nprint(x)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ], 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT"
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l", 
+        "i", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 0, 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": "hello", 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT"
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l", 
+        "i", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 0, 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": "hello", 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "hello", 
+            0
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l", 
+        "i", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": "world", 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "hello", 
+            0
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l", 
+        "i", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": "world", 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "world", 
+            1
+          ], 
+          [
+            "hello", 
+            0
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l", 
+        "i", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": "goodbye", 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "world", 
+            1
+          ], 
+          [
+            "hello", 
+            0
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l", 
+        "i", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": "goodbye", 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "world", 
+            1
+          ], 
+          [
+            "hello", 
+            0
+          ], 
+          [
+            "goodbye", 
+            2
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l", 
+        "i", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": "goodbye", 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "world", 
+            1
+          ], 
+          [
+            "hello", 
+            0
+          ], 
+          [
+            "goodbye", 
+            2
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "l", 
+        "i", 
+        "e"
+      ], 
+      "stdout": "{'world': 1, 'hello': 0, 'goodbye': 2}\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": [
+          "REF", 
+          1
+        ], 
+        "e": "goodbye", 
+        "l": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "world", 
+            1
+          ], 
+          [
+            "hello", 
+            0
+          ], 
+          [
+            "goodbye", 
+            2
+          ]
+        ], 
+        "2": [
+          "LIST", 
+          "hello", 
+          "world", 
+          "goodbye"
+        ]
+      }, 
+      "line": 5, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/list_test.golden_py3 b/v3/tests/backend-tests/list_test.golden_py3
new file mode 100644
index 000000000..9d34156ff
--- /dev/null
+++ b/v3/tests/backend-tests/list_test.golden_py3
@@ -0,0 +1,48 @@
+{
+  "code": "x = [1, 2, \"hello\", (3, 4)]\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "LIST", 
+          1, 
+          2, 
+          "hello", 
+          [
+            "REF", 
+            2
+          ]
+        ], 
+        "2": [
+          "TUPLE", 
+          3, 
+          4
+        ]
+      }, 
+      "line": 1, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/namedtuple.golden_py3 b/v3/tests/backend-tests/namedtuple.golden_py3
new file mode 100644
index 000000000..0815f8aa9
--- /dev/null
+++ b/v3/tests/backend-tests/namedtuple.golden_py3
@@ -0,0 +1,10013 @@
+{
+  "code": "from collections import namedtuple\n\nRestaurant = namedtuple('Restaurant', 'name cuisine phone dish price')\n\nR1 = Restaurant(\"Taillevent\", \"French\", \"343-3434\", \"Escargots\", 24.50)\nR2 = Restaurant(\"La Tour D'Argent\", \"French\", \"343-3344\", \"Ris de Veau\", 48.50)\nR3 = Restaurant(\"Pascal\", \"French\", \"333-4444\", \"Bouillabaisse\", 32.00)\nR4 = Restaurant(\"Thai Touch\", \"Thai\", \"444-3333\", \"Mee Krob\", 10.95)\nR5 = Restaurant(\"Thai Dishes\", \"Thai\", \"333-4433\", \"Paht Woon Sen\",  8.50)\nR6 = Restaurant(\"Thai Spoon\", \"Thai\", \"334-3344\", \"Mussamun\", 9.00)\nR7 = Restaurant(\"McDonald's\", \"Burgers\", \"333-4443\", \"Big Mac\", 3.95)\nR8 = Restaurant(\"Burger King\", \"Burgers\", \"444-3344\", \"Whopper\", 3.75)\nR9 = Restaurant(\"Wahoo's\", \"Fish Tacos\", \"443-4443\", \"Mahi Mahi Burrito\", 7.50)\nR10 = Restaurant(\"In-N-Out Burger\", \"Burgers\", \"434-3344\", \"Cheeseburger\", 2.50)\nR11 = Restaurant(\"The Shack\", \"Burgers\", \"333-3334\", \"Hot Link Burger\", 4.50)\nR12 = Restaurant(\"Gina's\", \"Pizza\", \"334-4433\", \"Combo Pizza\", 12.95)\nR13 = Restaurant(\"Peacock, Room\", \"Indian\", \"333-4443\", \"Rogan Josh\", 12.50)\nR14 = Restaurant(\"Gaylord\", \"Indian\", \"333-3433\", \"Tandoori Chicken\", 13.50)\nR15 = Restaurant(\"Mr. Chow\", \"Chinese\", \"222-3333\", \"Peking Duck\", 24.50)\nR16 = Restaurant(\"Chez Panisse\", \"California\", \"222-3322\", \"Grilled Duck Breast\", 25.00)\nR17 = Restaurant(\"Spago\", \"California\", \"333-2222\", \"Striped Bass\", 24.50)\nR18 = Restaurant(\"Sriped Bass\", \"Seafood\", \"333-2233\", \"Cedar Plank Salmon\", 21.50)\nR19 = Restaurant(\"Golden Pagoda\", \"Chinese\", \"232-3232\", \"Egg Foo Young\", 8.50)\nR20 = Restaurant(\"Langer's\", \"Delicatessen\", \"333-2223\", \"Pastrami Sandwich\", 11.50)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "namedtuple"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "namedtuple": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "namedtuple(typename, field_names, verbose, rename)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "namedtuple", 
+        "Restaurant"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "namedtuple": [
+          "REF", 
+          1
+        ], 
+        "Restaurant": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "namedtuple(typename, field_names, verbose, rename)", 
+          null
+        ], 
+        "2": [
+          "CLASS", 
+          "Restaurant", 
+          [
+            "tuple"
+          ], 
+          [
+            "__getnewargs__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__new__", 
+            [
+              "REF", 
+              4
+            ]
+          ], 
+          [
+            "__repr__", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__slots__", 
+            [
+              "REF", 
+              6
+            ]
+          ], 
+          [
+            "_asdict", 
+            [
+              "REF", 
+              7
+            ]
+          ], 
+          [
+            "_fields", 
+            [
+              "REF", 
+              8
+            ]
+          ], 
+          [
+            "_make", 
+            [
+              "REF", 
+              9
+            ]
+          ], 
+          [
+            "_replace", 
+            [
+              "REF", 
+              10
+            ]
+          ], 
+          [
+            "cuisine", 
+            [
+              "REF", 
+              11
+            ]
+          ], 
+          [
+            "dish", 
+            [
+              "REF", 
+              12
+            ]
+          ], 
+          [
+            "name", 
+            [
+              "REF", 
+              13
+            ]
+          ], 
+          [
+            "phone", 
+            [
+              "REF", 
+              14
+            ]
+          ], 
+          [
+            "price", 
+            [
+              "REF", 
+              15
+            ]
+          ]
+        ], 
+        "3": [
+          "FUNCTION", 
+          "__getnewargs__(self)", 
+          null
+        ], 
+        "4": [
+          "INSTANCE", 
+          "staticmethod"
+        ], 
+        "5": [
+          "FUNCTION", 
+          "__repr__(self)", 
+          null
+        ], 
+        "6": [
+          "TUPLE"
+        ], 
+        "7": [
+          "FUNCTION", 
+          "_asdict(self)", 
+          null
+        ], 
+        "8": [
+          "TUPLE", 
+          "name", 
+          "cuisine", 
+          "phone", 
+          "dish", 
+          "price"
+        ], 
+        "9": [
+          "INSTANCE", 
+          "classmethod"
+        ], 
+        "10": [
+          "FUNCTION", 
+          "_replace(_self, **kwds)", 
+          null
+        ], 
+        "11": [
+          "INSTANCE", 
+          "property"
+        ], 
+        "12": [
+          "INSTANCE", 
+          "property"
+        ], 
+        "13": [
+          "INSTANCE", 
+          "property"
+        ], 
+        "14": [
+          "INSTANCE", 
+          "property"
+        ], 
+        "15": [
+          "INSTANCE", 
+          "property"
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "namedtuple", 
+        "Restaurant", 
+        "R1"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "namedtuple": [
+          "REF", 
+          1
+        ], 
+        "R1": [
+          "REF", 
+          16
+        ], 
+        "Restaurant": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "namedtuple(typename, field_names, verbose, rename)", 
+          null
+        ], 
+        "2": [
+          "CLASS", 
+          "Restaurant", 
+          [
+            "tuple"
+          ], 
+          [
+            "__getnewargs__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__new__", 
+            [
+              "REF", 
+              4
+            ]
+          ], 
+          [
+            "__repr__", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__slots__", 
+            [
+              "REF", 
+              6
+            ]
+          ], 
+          [
+            "_asdict", 
+            [
+              "REF", 
+              7
+            ]
+          ], 
+          [
+            "_fields", 
+            [
+              "REF", 
+              8
+            ]
+          ], 
+          [
+            "_make", 
+            [
+              "REF", 
+              9
+            ]
+          ], 
+          [
+            "_replace", 
+            [
+              "REF", 
+              10
+            ]
+          ], 
+          [
+            "cuisine", 
+            [
+              "REF", 
+              11
+            ]
+          ], 
+          [
+            "dish", 
+            [
+              "REF", 
+              12
+            ]
+          ], 
+          [
+            "name", 
+            [
+              "REF", 
+              13
+            ]
+          ], 
+          [
+            "phone", 
+            [
+              "REF", 
+              14
+            ]
+          ], 
+          [
+            "price", 
+            [
+              "REF", 
+              15
+            ]
+          ]
+        ], 
+        "3": [
+          "FUNCTION", 
+          "__getnewargs__(self)", 
+          null
+        ], 
+        "4": [
+          "INSTANCE", 
+          "staticmethod"
+        ], 
+        "5": [
+          "FUNCTION", 
+          "__repr__(self)", 
+          null
+        ], 
+        "6": [
+          "TUPLE"
+        ], 
+        "7": [
+          "FUNCTION", 
+          "_asdict(self)", 
+          null
+        ], 
+        "8": [
+          "TUPLE", 
+          "name", 
+          "cuisine", 
+          "phone", 
+          "dish", 
+          "price"
+        ], 
+        "9": [
+          "INSTANCE", 
+          "classmethod"
+        ], 
+        "10": [
+          "FUNCTION", 
+          "_replace(_self, **kwds)", 
+          null
+        ], 
+        "11": [
+          "INSTANCE", 
+          "property"
+        ], 
+        "12": [
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+          ], 
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+          ]
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+          ], 
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+          ], 
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+          ], 
+          [
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+          ]
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+          ], 
+          [
+            "name", 
+            "Mr. Chow"
+          ], 
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+            "222-3333"
+          ], 
+          [
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+          ]
+        ], 
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+          "Restaurant", 
+          [
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+          ], 
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+          ], 
+          [
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+          ], 
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+          ], 
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+          ]
+        ], 
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+          [
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+          ], 
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+          ]
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+          ], 
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+          ], 
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+          ], 
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+          ]
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+          ], 
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+          ], 
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+          ], 
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+          ], 
+          [
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+          ]
+        ]
+      }, 
+      "line": 24, 
+      "event": "step_line"
+    }, 
+    {
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+        "namedtuple", 
+        "Restaurant", 
+        "R1", 
+        "R2", 
+        "R3", 
+        "R4", 
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+        "R10", 
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+        "R13", 
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+        "R15", 
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+        "R17", 
+        "R18", 
+        "R19", 
+        "R20"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "R5": [
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+        ], 
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+        ], 
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+        ], 
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+        ], 
+        "R20": [
+          "REF", 
+          35
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "namedtuple(typename, field_names, verbose, rename)", 
+          null
+        ], 
+        "2": [
+          "CLASS", 
+          "Restaurant", 
+          [
+            "tuple"
+          ], 
+          [
+            "__getnewargs__", 
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+        ], 
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+          ], 
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+          ], 
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+          ], 
+          [
+            "phone", 
+            "343-3434"
+          ], 
+          [
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+            24.500
+          ]
+        ], 
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+          "INSTANCE", 
+          "Restaurant", 
+          [
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+            "French"
+          ], 
+          [
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+            "Ris de Veau"
+          ], 
+          [
+            "name", 
+            "La Tour D'Argent"
+          ], 
+          [
+            "phone", 
+            "343-3344"
+          ], 
+          [
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+          ]
+        ], 
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+          "INSTANCE", 
+          "Restaurant", 
+          [
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+            "French"
+          ], 
+          [
+            "dish", 
+            "Bouillabaisse"
+          ], 
+          [
+            "name", 
+            "Pascal"
+          ], 
+          [
+            "phone", 
+            "333-4444"
+          ], 
+          [
+            "price", 
+            32.000
+          ]
+        ], 
+        "19": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mee Krob"
+          ], 
+          [
+            "name", 
+            "Thai Touch"
+          ], 
+          [
+            "phone", 
+            "444-3333"
+          ], 
+          [
+            "price", 
+            10.950
+          ]
+        ], 
+        "20": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Paht Woon Sen"
+          ], 
+          [
+            "name", 
+            "Thai Dishes"
+          ], 
+          [
+            "phone", 
+            "333-4433"
+          ], 
+          [
+            "price", 
+            8.500
+          ]
+        ], 
+        "21": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mussamun"
+          ], 
+          [
+            "name", 
+            "Thai Spoon"
+          ], 
+          [
+            "phone", 
+            "334-3344"
+          ], 
+          [
+            "price", 
+            9.000
+          ]
+        ], 
+        "22": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Burgers"
+          ], 
+          [
+            "dish", 
+            "Big Mac"
+          ], 
+          [
+            "name", 
+            "McDonald's"
+          ], 
+          [
+            "phone", 
+            "333-4443"
+          ], 
+          [
+            "price", 
+            3.950
+          ]
+        ], 
+        "23": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Burgers"
+          ], 
+          [
+            "dish", 
+            "Whopper"
+          ], 
+          [
+            "name", 
+            "Burger King"
+          ], 
+          [
+            "phone", 
+            "444-3344"
+          ], 
+          [
+            "price", 
+            3.750
+          ]
+        ], 
+        "24": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Fish Tacos"
+          ], 
+          [
+            "dish", 
+            "Mahi Mahi Burrito"
+          ], 
+          [
+            "name", 
+            "Wahoo's"
+          ], 
+          [
+            "phone", 
+            "443-4443"
+          ], 
+          [
+            "price", 
+            7.500
+          ]
+        ], 
+        "25": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Burgers"
+          ], 
+          [
+            "dish", 
+            "Cheeseburger"
+          ], 
+          [
+            "name", 
+            "In-N-Out Burger"
+          ], 
+          [
+            "phone", 
+            "434-3344"
+          ], 
+          [
+            "price", 
+            2.500
+          ]
+        ], 
+        "26": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Burgers"
+          ], 
+          [
+            "dish", 
+            "Hot Link Burger"
+          ], 
+          [
+            "name", 
+            "The Shack"
+          ], 
+          [
+            "phone", 
+            "333-3334"
+          ], 
+          [
+            "price", 
+            4.500
+          ]
+        ], 
+        "27": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Pizza"
+          ], 
+          [
+            "dish", 
+            "Combo Pizza"
+          ], 
+          [
+            "name", 
+            "Gina's"
+          ], 
+          [
+            "phone", 
+            "334-4433"
+          ], 
+          [
+            "price", 
+            12.950
+          ]
+        ], 
+        "28": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Indian"
+          ], 
+          [
+            "dish", 
+            "Rogan Josh"
+          ], 
+          [
+            "name", 
+            "Peacock, Room"
+          ], 
+          [
+            "phone", 
+            "333-4443"
+          ], 
+          [
+            "price", 
+            12.500
+          ]
+        ], 
+        "29": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Indian"
+          ], 
+          [
+            "dish", 
+            "Tandoori Chicken"
+          ], 
+          [
+            "name", 
+            "Gaylord"
+          ], 
+          [
+            "phone", 
+            "333-3433"
+          ], 
+          [
+            "price", 
+            13.500
+          ]
+        ], 
+        "30": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Chinese"
+          ], 
+          [
+            "dish", 
+            "Peking Duck"
+          ], 
+          [
+            "name", 
+            "Mr. Chow"
+          ], 
+          [
+            "phone", 
+            "222-3333"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
+        ], 
+        "31": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "California"
+          ], 
+          [
+            "dish", 
+            "Grilled Duck Breast"
+          ], 
+          [
+            "name", 
+            "Chez Panisse"
+          ], 
+          [
+            "phone", 
+            "222-3322"
+          ], 
+          [
+            "price", 
+            25.000
+          ]
+        ], 
+        "32": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "California"
+          ], 
+          [
+            "dish", 
+            "Striped Bass"
+          ], 
+          [
+            "name", 
+            "Spago"
+          ], 
+          [
+            "phone", 
+            "333-2222"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
+        ], 
+        "33": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Seafood"
+          ], 
+          [
+            "dish", 
+            "Cedar Plank Salmon"
+          ], 
+          [
+            "name", 
+            "Sriped Bass"
+          ], 
+          [
+            "phone", 
+            "333-2233"
+          ], 
+          [
+            "price", 
+            21.500
+          ]
+        ], 
+        "34": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Chinese"
+          ], 
+          [
+            "dish", 
+            "Egg Foo Young"
+          ], 
+          [
+            "name", 
+            "Golden Pagoda"
+          ], 
+          [
+            "phone", 
+            "232-3232"
+          ], 
+          [
+            "price", 
+            8.500
+          ]
+        ], 
+        "35": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Delicatessen"
+          ], 
+          [
+            "dish", 
+            "Pastrami Sandwich"
+          ], 
+          [
+            "name", 
+            "Langer's"
+          ], 
+          [
+            "phone", 
+            "333-2223"
+          ], 
+          [
+            "price", 
+            11.500
+          ]
+        ]
+      }, 
+      "line": 24, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/newstyle_class.golden_py3 b/v3/tests/backend-tests/newstyle_class.golden_py3
new file mode 100644
index 000000000..c69af1f0e
--- /dev/null
+++ b/v3/tests/backend-tests/newstyle_class.golden_py3
@@ -0,0 +1,1631 @@
+{
+  "code": "class A(object):\n  bla = \"A\"\n  def __init__(self):\n    self.blb = \"B\"\n\n  def x(self):\n    self.bla = self.blb\n\na = A()\n\na.x()\n\nprint(a.bla)\nprint(A.bla)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "A", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "A", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "A_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "A", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "A", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "A_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "A", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {}, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "A", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "A_f1", 
+          "ordered_varnames": []
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "A", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "bla": "A"
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "A", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "A_f1", 
+          "ordered_varnames": [
+            "bla"
+          ]
+        }
+      ], 
+      "globals": {}, 
+      "heap": {
+        "1": [
+          "DICT", 
+          [
+            "bla", 
+            "A"
+          ]
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "A", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "bla": "A", 
+            "__init__": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "A", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "A_f1_p", 
+          "ordered_varnames": [
+            "__init__", 
+            "bla"
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+      "event": "step_line"
+    }, 
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+        "A", 
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+      "event": "step_line"
+    }, 
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+      "func_name": "", 
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+            ]
+          ], 
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+              "REF", 
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+            ]
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+        ], 
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+          "INSTANCE", 
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+            "bla", 
+            "B"
+          ], 
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+            "blb", 
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+      }, 
+      "line": 14, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/one_func.golden_py3 b/v3/tests/backend-tests/one_func.golden_py3
new file mode 100644
index 000000000..ecd811f5c
--- /dev/null
+++ b/v3/tests/backend-tests/one_func.golden_py3
@@ -0,0 +1,350 @@
+{
+  "code": "def add(a, b, c):\n  d = a + b\n  return c + d\n\nx = 5\ny = 10\nz = x * y\nprint(add(x, y, z))\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "add": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ], 
+        "z": 50
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "add", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "a": 5, 
+            "c": 50, 
+            "b": 10
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "add", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "add_f1", 
+          "ordered_varnames": [
+            "a", 
+            "b", 
+            "c"
+          ]
+        }
+      ], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ], 
+        "z": 50
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "add", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "a": 5, 
+            "c": 50, 
+            "b": 10
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "add", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "add_f1", 
+          "ordered_varnames": [
+            "a", 
+            "b", 
+            "c"
+          ]
+        }
+      ], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ], 
+        "z": 50
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "add", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "a": 5, 
+            "c": 50, 
+            "b": 10, 
+            "d": 15
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "add", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "add_f1", 
+          "ordered_varnames": [
+            "a", 
+            "b", 
+            "c", 
+            "d"
+          ]
+        }
+      ], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ], 
+        "z": 50
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "add", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "a": 5, 
+            "__return__": 65, 
+            "c": 50, 
+            "b": 10, 
+            "d": 15
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "add", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "add_f1", 
+          "ordered_varnames": [
+            "a", 
+            "b", 
+            "c", 
+            "d", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ], 
+        "z": 50
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "add", 
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "65\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "add": [
+          "REF", 
+          1
+        ], 
+        "z": 50
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "add(a, b, c)", 
+          null
+        ]
+      }, 
+      "line": 8, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/open_error.golden_py3 b/v3/tests/backend-tests/open_error.golden_py3
new file mode 100644
index 000000000..7f343f9c8
--- /dev/null
+++ b/v3/tests/backend-tests/open_error.golden_py3
@@ -0,0 +1,26 @@
+{
+  "code": "for line in open(\"/etc/passwd\"):\n    print(line)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "exception_msg": "NameError: name 'open' is not defined", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "exception"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/parent-finding-1.golden_py3 b/v3/tests/backend-tests/parent-finding-1.golden_py3
new file mode 100644
index 000000000..00a4aab28
--- /dev/null
+++ b/v3/tests/backend-tests/parent-finding-1.golden_py3
@@ -0,0 +1,483 @@
+{
+  "code": "# make sure OPT finds f as the parent of g\ndef f(x, y):\n    def g(x):\n        return x + y\n    return g(3)\n\nf(1, 2)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y)", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "x", 
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "x", 
+            "y"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "g": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "g"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "g(x)", 
+          1
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "g", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "g": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "g"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "x": 3
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "g", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [
+            1
+          ], 
+          "unique_hash": "g_f2", 
+          "ordered_varnames": [
+            "x"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(x, y)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "g(x)", 
+          1
+        ]
+      }, 
+      "line": 3, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "g", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "y": 2, 
+            "x": 1, 
+            "g": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1_p", 
+          "ordered_varnames": [
+            "x", 
+            "y", 
+            "g"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
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diff --git a/v3/tests/backend-tests/parent-finding-2.golden_py3 b/v3/tests/backend-tests/parent-finding-2.golden_py3
new file mode 100644
index 000000000..812420ec4
--- /dev/null
+++ b/v3/tests/backend-tests/parent-finding-2.golden_py3
@@ -0,0 +1,957 @@
+{
+  "code": "# make sure OPT finds horse as parent of mask\ndef horse(mask):\n    horse = mask\n    def mask(horse):\n        return horse\n    return horse(mask)\n\nmask = lambda horse: horse(2)\n\nhorse(mask)\n", 
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+      "globals": {
+        "horse": [
+          "REF", 
+          1
+        ], 
+        "mask": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "horse(mask)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(horse)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "mask(horse)", 
+          1
+        ]
+      }, 
+      "line": 8, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "horse", 
+        "mask"
+      ], 
+      "stdout": "", 
+      "func_name": "horse", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": 2, 
+            "horse": [
+              "REF", 
+              2
+            ], 
+            "mask": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "horse", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "horse_f1_p", 
+          "ordered_varnames": [
+            "mask", 
+            "horse", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "horse": [
+          "REF", 
+          1
+        ], 
+        "mask": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "horse(mask)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(horse)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "mask(horse)", 
+          1
+        ]
+      }, 
+      "line": 6, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "horse", 
+        "mask"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": 2, 
+            "horse": [
+              "REF", 
+              2
+            ], 
+            "mask": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "horse", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "horse_f1_p_z", 
+          "ordered_varnames": [
+            "mask", 
+            "horse", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "horse": [
+          "REF", 
+          1
+        ], 
+        "mask": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "horse(mask)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(horse)", 
+          null
+        ], 
+        "3": [
+          "FUNCTION", 
+          "mask(horse)", 
+          1
+        ]
+      }, 
+      "line": 10, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/parse_error.golden_py3 b/v3/tests/backend-tests/parse_error.golden_py3
new file mode 100644
index 000000000..047dce543
--- /dev/null
+++ b/v3/tests/backend-tests/parse_error.golden_py3
@@ -0,0 +1,11 @@
+{
+  "code": "x = 0\nfor i in range(10):\n  x += 1\n   print x\n  x += 1\n\n", 
+  "trace": [
+    {
+      "exception_msg": "IndentationError: unexpected indent (, line 4)", 
+      "line": 4, 
+      "event": "uncaught_exception", 
+      "offset": 3
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/parse_error_2.golden_py3 b/v3/tests/backend-tests/parse_error_2.golden_py3
new file mode 100644
index 000000000..a6973b8ee
--- /dev/null
+++ b/v3/tests/backend-tests/parse_error_2.golden_py3
@@ -0,0 +1,11 @@
+{
+  "code": "x = 5\ny = x\nz = x + y\n\nfor x haslk;fjlasfhlkjl;sa\n", 
+  "trace": [
+    {
+      "exception_msg": "SyntaxError: invalid syntax (, line 5)", 
+      "line": 5, 
+      "event": "uncaught_exception", 
+      "offset": 11
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/parse_error_3.golden_py3 b/v3/tests/backend-tests/parse_error_3.golden_py3
new file mode 100644
index 000000000..8ae537dd0
--- /dev/null
+++ b/v3/tests/backend-tests/parse_error_3.golden_py3
@@ -0,0 +1,11 @@
+{
+  "code": "x = []\nfor i in range(10):\n    x.append(i)\n    if i == 24:\n        pass\n   print y\n", 
+  "trace": [
+    {
+      "exception_msg": "IndentationError: unindent does not match any outer indentation level (, line 6)", 
+      "line": 6, 
+      "event": "uncaught_exception", 
+      "offset": 11
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/pie-test.golden_py3 b/v3/tests/backend-tests/pie-test.golden_py3
new file mode 100644
index 000000000..e913056f2
--- /dev/null
+++ b/v3/tests/backend-tests/pie-test.golden_py3
@@ -0,0 +1,91 @@
+{
+  "code": "import operator\nfrom math import pi, e\npie = operator.add(pi, e)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "operator"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "operator": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "INSTANCE", 
+          "module"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "operator", 
+        "pi", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "operator": [
+          "REF", 
+          1
+        ], 
+        "pi": 3.142, 
+        "e": 2.718
+      }, 
+      "heap": {
+        "1": [
+          "INSTANCE", 
+          "module"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "operator", 
+        "pi", 
+        "e", 
+        "pie"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "operator": [
+          "REF", 
+          1
+        ], 
+        "pi": 3.142, 
+        "e": 2.718, 
+        "pie": 5.860
+      }, 
+      "heap": {
+        "1": [
+          "INSTANCE", 
+          "module"
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/py-modules.golden_py3 b/v3/tests/backend-tests/py-modules.golden_py3
new file mode 100644
index 000000000..e8551d9ee
--- /dev/null
+++ b/v3/tests/backend-tests/py-modules.golden_py3
@@ -0,0 +1,132 @@
+{
+  "code": "# test to make sure nothing crashes when tracing code in pure-Python\n# function calls imported from modules\nimport random\nrandom.randint(10, 100)\n\nfrom re import compile\nx = compile('foo')\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "random"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "random": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "INSTANCE", 
+          "module"
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "random"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "random": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "INSTANCE", 
+          "module"
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "random", 
+        "compile"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "compile": [
+          "REF", 
+          2
+        ], 
+        "random": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "INSTANCE", 
+          "module"
+        ], 
+        "2": [
+          "FUNCTION", 
+          "compile(pattern, flags)", 
+          null
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "random", 
+        "compile", 
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "compile": [
+          "REF", 
+          2
+        ], 
+        "x": [
+          "REF", 
+          3
+        ], 
+        "random": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "INSTANCE", 
+          "module"
+        ], 
+        "2": [
+          "FUNCTION", 
+          "compile(pattern, flags)", 
+          null
+        ], 
+        "3": [
+          "INSTANCE", 
+          "SRE_Pattern"
+        ]
+      }, 
+      "line": 7, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/runtime_error.golden_py3 b/v3/tests/backend-tests/runtime_error.golden_py3
new file mode 100644
index 000000000..c26590156
--- /dev/null
+++ b/v3/tests/backend-tests/runtime_error.golden_py3
@@ -0,0 +1,440 @@
+{
+  "code": "x = 5\nfor i in range(10):\n  if i == x:\n    z = x + y # ERROR!\n  else:\n    z = i\n  print(z)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": 5
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 0, 
+        "x": 5
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 0, 
+        "x": 5
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 0, 
+        "x": 5, 
+        "z": 0
+      }, 
+      "heap": {}, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 0, 
+        "x": 5, 
+        "z": 0
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "x": 5, 
+        "z": 0
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "x": 5, 
+        "z": 0
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "x": 5, 
+        "z": 1
+      }, 
+      "heap": {}, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "x": 5, 
+        "z": 1
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": 5, 
+        "z": 1
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": 5, 
+        "z": 1
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": 5, 
+        "z": 2
+      }, 
+      "heap": {}, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": 5, 
+        "z": 2
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 3, 
+        "x": 5, 
+        "z": 2
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 3, 
+        "x": 5, 
+        "z": 2
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 3, 
+        "x": 5, 
+        "z": 3
+      }, 
+      "heap": {}, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 3, 
+        "x": 5, 
+        "z": 3
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 4, 
+        "x": 5, 
+        "z": 3
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 4, 
+        "x": 5, 
+        "z": 3
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n3\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 4, 
+        "x": 5, 
+        "z": 4
+      }, 
+      "heap": {}, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n3\n4\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 4, 
+        "x": 5, 
+        "z": 4
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n3\n4\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 5, 
+        "x": 5, 
+        "z": 4
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n3\n4\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 5, 
+        "x": 5, 
+        "z": 4
+      }, 
+      "heap": {}, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "i", 
+        "z"
+      ], 
+      "stdout": "0\n1\n2\n3\n4\n", 
+      "exception_msg": "NameError: name 'y' is not defined", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 5, 
+        "x": 5, 
+        "z": 4
+      }, 
+      "heap": {}, 
+      "line": 4, 
+      "event": "exception"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/set_test.golden_py3 b/v3/tests/backend-tests/set_test.golden_py3
new file mode 100644
index 000000000..bf39a5207
--- /dev/null
+++ b/v3/tests/backend-tests/set_test.golden_py3
@@ -0,0 +1,151 @@
+{
+  "code": "x = set()\nx.add('a')\nx.add('a')\nx.add('b')\nx.add('c')\nx.add('b')\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "SET"
+        ]
+      }, 
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+          1
+        ]
+      }, 
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+          "SET", 
+          "a"
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
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+      ], 
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+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
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+          "c", 
+          "b"
+        ]
+      }, 
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+    }, 
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+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
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+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/simple.golden_py3 b/v3/tests/backend-tests/simple.golden_py3
new file mode 100644
index 000000000..c3f69caa6
--- /dev/null
+++ b/v3/tests/backend-tests/simple.golden_py3
@@ -0,0 +1,501 @@
+{
+  "code": "x = 5\ny = 10\nz = x * y\nprint(\"HELLO WORLD\")\nfor i in range(10):\n  print(z * i)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "x": 5
+      }, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": 10, 
+        "x": 5
+      }, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "z": 50
+      }, 
+      "heap": {}, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z"
+      ], 
+      "stdout": "HELLO WORLD\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "y": 10, 
+        "x": 5, 
+        "z": 50
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 0, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 0, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 1, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 2, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 3, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 3, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 4, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 4, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 5, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 5, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 6, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n300\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 6, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n300\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 7, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n300\n350\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 7, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n300\n350\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 8, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n300\n350\n400\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 8, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n300\n350\n400\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 9, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n300\n350\n400\n450\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 9, 
+        "x": 5, 
+        "z": 50, 
+        "y": 10
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "x", 
+        "y", 
+        "z", 
+        "i"
+      ], 
+      "stdout": "HELLO WORLD\n0\n50\n100\n150\n200\n250\n300\n350\n400\n450\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "i": 9, 
+        "y": 10, 
+        "z": 50, 
+        "x": 5
+      }, 
+      "heap": {}, 
+      "line": 5, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/three_lists.golden_py3 b/v3/tests/backend-tests/three_lists.golden_py3
new file mode 100644
index 000000000..27775034e
--- /dev/null
+++ b/v3/tests/backend-tests/three_lists.golden_py3
@@ -0,0 +1,632 @@
+{
+  "code": "# test case submitted by Peter Wentworth (p.wentworth@ru.ac.za)\n\ndef f(xs):\n    print(xs)\n\na = [10, 20, 30]\nb = a\nc = [10, 20, 30]\nd = 24\ne = (a, b, c)\n\nf(b)\n\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(xs)", 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f", 
+        "a"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          2
+        ], 
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f", 
+        "a", 
+        "b"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          2
+        ], 
+        "b": [
+          "REF", 
+          2
+        ], 
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f", 
+        "a", 
+        "b", 
+        "c"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          2
+        ], 
+        "c": [
+          "REF", 
+          3
+        ], 
+        "b": [
+          "REF", 
+          2
+        ], 
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ], 
+        "3": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f", 
+        "a", 
+        "b", 
+        "c", 
+        "d"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          2
+        ], 
+        "c": [
+          "REF", 
+          3
+        ], 
+        "b": [
+          "REF", 
+          2
+        ], 
+        "d": 24, 
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ], 
+        "3": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f", 
+        "a", 
+        "b", 
+        "c", 
+        "d", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          2
+        ], 
+        "c": [
+          "REF", 
+          3
+        ], 
+        "b": [
+          "REF", 
+          2
+        ], 
+        "e": [
+          "REF", 
+          4
+        ], 
+        "d": 24, 
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(xs)", 
+          null
+        ], 
+        "2": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ], 
+        "3": [
+          "LIST", 
+          10, 
+          20, 
+          30
+        ], 
+        "4": [
+          "TUPLE", 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            2
+          ], 
+          [
+            "REF", 
+            3
+          ]
+        ]
+      }, 
+      "line": 12, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f", 
+        "a", 
+        "b", 
+        "c", 
+        "d", 
+        "e"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "xs": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "xs"
+          ]
+        }
+      ], 
+      "globals": {
+        "a": [
+          "REF", 
+          2
+        ], 
+        "c": [
+          "REF", 
+          3
+        ], 
+        "b": [
+          "REF", 
+          2
+        ], 
+        "e": [
+          "REF", 
+          4
+        ], 
+        "d": 24, 
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
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diff --git a/v3/tests/backend-tests/tuple_test.golden_py3 b/v3/tests/backend-tests/tuple_test.golden_py3
new file mode 100644
index 000000000..f1c5b4fc3
--- /dev/null
+++ b/v3/tests/backend-tests/tuple_test.golden_py3
@@ -0,0 +1,72 @@
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diff --git a/v3/tests/backend-tests/two_funcs.golden_py3 b/v3/tests/backend-tests/two_funcs.golden_py3
new file mode 100644
index 000000000..9a2a15184
--- /dev/null
+++ b/v3/tests/backend-tests/two_funcs.golden_py3
@@ -0,0 +1,1453 @@
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+}
diff --git a/v3/tests/backend-tests/varargs.golden_py3 b/v3/tests/backend-tests/varargs.golden_py3
new file mode 100644
index 000000000..64cd90d22
--- /dev/null
+++ b/v3/tests/backend-tests/varargs.golden_py3
@@ -0,0 +1,267 @@
+{
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+            "Philip"
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          "c", 
+          "d", 
+          "e"
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "parrot"
+      ], 
+      "stdout": "", 
+      "func_name": "parrot", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": null, 
+            "args": [
+              "REF", 
+              3
+            ], 
+            "mandatory": "a", 
+            "mandatory2": "b", 
+            "kwargs": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "parrot", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "parrot_f1", 
+          "ordered_varnames": [
+            "mandatory", 
+            "mandatory2", 
+            "args", 
+            "kwargs", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "parrot": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "parrot(mandatory, mandatory2, *args, **kwargs)", 
+          null
+        ], 
+        "2": [
+          "DICT", 
+          [
+            "age", 
+            "35"
+          ], 
+          [
+            "name", 
+            "Philip"
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          "c", 
+          "d", 
+          "e"
+        ]
+      }, 
+      "line": 2, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "parrot"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "parrot": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "parrot(mandatory, mandatory2, *args, **kwargs)", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "return"
+    }
+  ]
+}

From 8a50e3f0d853ae521c3d29a20cbb029899242ace Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 22 Sep 2012 23:40:43 -0700
Subject: [PATCH 430/502] tiny

---
 v3/tests/run-all-tests.sh | 8 ++++++++
 1 file changed, 8 insertions(+)
 create mode 100755 v3/tests/run-all-tests.sh

diff --git a/v3/tests/run-all-tests.sh b/v3/tests/run-all-tests.sh
new file mode 100755
index 000000000..051ffd8d5
--- /dev/null
+++ b/v3/tests/run-all-tests.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+echo 'Python 2 test'
+echo '============='
+python golden_test.py --all
+echo
+echo 'Python 3 test'
+echo '============='
+python golden_test.py --all --py3

From f84e907f8ea27a450232ae55d8b01f0eaf4929fa Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 23 Sep 2012 00:22:08 -0700
Subject: [PATCH 431/502] added

---
 v3/tests/diff_py23_golden_files.py | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 v3/tests/diff_py23_golden_files.py

diff --git a/v3/tests/diff_py23_golden_files.py b/v3/tests/diff_py23_golden_files.py
new file mode 100644
index 000000000..904cb6d04
--- /dev/null
+++ b/v3/tests/diff_py23_golden_files.py
@@ -0,0 +1,7 @@
+import os, itertools, subprocess
+
+for (dn, sd, files) in itertools.chain(os.walk('backend-tests/'), os.walk('../example-code/')):
+  for f in files:
+    bn, ext = os.path.splitext(f)
+    if ext == '.golden':
+      subprocess.call(['diff', '-u', os.path.join(dn, bn + ext), os.path.join(dn, bn + '.golden_py3')])

From 0fd95cb72ef9c6799a9eab51a27604b7de22bc7d Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 24 Sep 2012 15:14:48 -0700
Subject: [PATCH 432/502] updated regression test suite and added new test

---
 .../backend-tests/py3_func_annotations.golden | 11 +++++++++++
 .../py3_func_annotations.golden_py3           | 19 +++++++++++++++++++
 .../backend-tests/py3_func_annotations.txt    |  9 +++++++++
 v3/tests/golden_test.py                       | 10 ++++++----
 v3/tests/run-all-tests.sh                     |  8 ++++----
 5 files changed, 49 insertions(+), 8 deletions(-)
 create mode 100644 v3/tests/backend-tests/py3_func_annotations.golden
 create mode 100644 v3/tests/backend-tests/py3_func_annotations.golden_py3
 create mode 100644 v3/tests/backend-tests/py3_func_annotations.txt

diff --git a/v3/tests/backend-tests/py3_func_annotations.golden b/v3/tests/backend-tests/py3_func_annotations.golden
new file mode 100644
index 000000000..a62687849
--- /dev/null
+++ b/v3/tests/backend-tests/py3_func_annotations.golden
@@ -0,0 +1,11 @@
+{
+  "code": "# test case of Python 3 function annotations inspired by David G. Kay\ndef remove_by_name(L: 'list of Restaurant', name: str) -> 'list of Restaurant':\n    \"\"\" Given name, remove all Restaurants with that name from collection.\n    \"\"\"\n    result = []\n    for r in L:\n        if r.name != name:\n            result.append(r)\n    return result\n", 
+  "trace": [
+    {
+      "exception_msg": "SyntaxError: invalid syntax (, line 2)", 
+      "line": 2, 
+      "event": "uncaught_exception", 
+      "offset": 21
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/py3_func_annotations.golden_py3 b/v3/tests/backend-tests/py3_func_annotations.golden_py3
new file mode 100644
index 000000000..4dd046e9e
--- /dev/null
+++ b/v3/tests/backend-tests/py3_func_annotations.golden_py3
@@ -0,0 +1,19 @@
+{
+  "code": "# test case of Python 3 function annotations inspired by David G. Kay\ndef remove_by_name(L: 'list of Restaurant', name: str) -> 'list of Restaurant':\n    \"\"\" Given name, remove all Restaurants with that name from collection.\n    \"\"\"\n    result = []\n    for r in L:\n        if r.name != name:\n            result.append(r)\n    return result\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "exception_msg": "ValueError: Function has keyword-only arguments or annotations, use getfullargspec() API which can support them", 
+      "event": "uncaught_exception"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/py3_func_annotations.txt b/v3/tests/backend-tests/py3_func_annotations.txt
new file mode 100644
index 000000000..24037afbf
--- /dev/null
+++ b/v3/tests/backend-tests/py3_func_annotations.txt
@@ -0,0 +1,9 @@
+# test case of Python 3 function annotations inspired by David G. Kay
+def remove_by_name(L: 'list of Restaurant', name: str) -> 'list of Restaurant':
+    """ Given name, remove all Restaurants with that name from collection.
+    """
+    result = []
+    for r in L:
+        if r.name != name:
+            result.append(r)
+    return result
diff --git a/v3/tests/golden_test.py b/v3/tests/golden_test.py
index 2b451ecde..f2d54b8e9 100644
--- a/v3/tests/golden_test.py
+++ b/v3/tests/golden_test.py
@@ -24,6 +24,8 @@ def execute(input_filename):
     print '(has stderr)'
   #  print '  stderr {'
   #  print stderr, '}'
+  else:
+    print
 
   # capture stdout into outfile, filtering out machine-specific addresses
   outfile = base + OUTPUT_FILE_EXTENSION
@@ -84,7 +86,7 @@ def diff_test_output(test_name):
 
 
 def run_test(input_filename, clobber_golden=False):
-  print 'Testing', input_filename
+  print 'Testing', input_filename,
 
   (base, ext) = os.path.splitext(input_filename)
   assert ext == INPUT_FILE_EXTENSION
@@ -131,18 +133,18 @@ def diff_all_test_outputs():
   parser.add_option("--diffall", action="store_true", dest="diff_all",
                     help="Diff against golden file for all tests")
   parser.add_option("--py3", action="store_true", dest="py3",
-                    help="Run Python 3 tests (rather than Python 2)")
+                    help="Run tests using Python 3.2 (rather than Python 2.7)")
   (options, args) = parser.parse_args()
 
 
   INPUT_FILE_EXTENSION = '.txt' # input test files are .txt, NOT .py
 
   if options.py3:
-    PROGRAM = ['python3', '../generate_json_trace.py']
+    PROGRAM = ['python3.2', '../generate_json_trace.py']
     OUTPUT_FILE_EXTENSION = '.out_py3'
     GOLDEN_FILE_EXTENSION = '.golden_py3'
   else:
-    PROGRAM = ['python2', '../generate_json_trace.py']
+    PROGRAM = ['python2.7', '../generate_json_trace.py']
     OUTPUT_FILE_EXTENSION = '.out'
     GOLDEN_FILE_EXTENSION = '.golden'
 
diff --git a/v3/tests/run-all-tests.sh b/v3/tests/run-all-tests.sh
index 051ffd8d5..40b4e7577 100755
--- a/v3/tests/run-all-tests.sh
+++ b/v3/tests/run-all-tests.sh
@@ -1,8 +1,8 @@
 #!/bin/sh
-echo 'Python 2 test'
-echo '============='
+echo 'Python 2.7 test'
+echo '==============='
 python golden_test.py --all
 echo
-echo 'Python 3 test'
-echo '============='
+echo 'Python 3.2 test'
+echo '==============='
 python golden_test.py --all --py3

From 1026ae1b8cb596e8a7a7500cdd181052f13a7305 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 24 Sep 2012 15:55:06 -0700
Subject: [PATCH 433/502] support Python 3 annotations and keyword-only
 arguments

---
 v3/pg_encoder.py                              | 17 +++++++--
 .../py3_func_annotations.golden_py3           | 23 ++++++++++-
 v3/tests/backend-tests/py3_kwonly_args.golden | 11 ++++++
 .../backend-tests/py3_kwonly_args.golden_py3  | 38 +++++++++++++++++++
 v3/tests/backend-tests/py3_kwonly_args.txt    |  3 ++
 5 files changed, 86 insertions(+), 6 deletions(-)
 create mode 100644 v3/tests/backend-tests/py3_kwonly_args.golden
 create mode 100644 v3/tests/backend-tests/py3_kwonly_args.golden_py3
 create mode 100644 v3/tests/backend-tests/py3_kwonly_args.txt

diff --git a/v3/pg_encoder.py b/v3/pg_encoder.py
index a247bee3c..03ac0f67c 100644
--- a/v3/pg_encoder.py
+++ b/v3/pg_encoder.py
@@ -158,14 +158,23 @@ def encode(self, dat):
           if k not in ('__module__', '__return__', '__locals__'):
             new_obj.append([self.encode(k), self.encode(v)])
       elif typ in (types.FunctionType, types.MethodType):
-        # NB: In Python 3.0, getargspec is deprecated in favor of getfullargspec
-        argspec = inspect.getargspec(dat)
+        if is_python3:
+          argspec = inspect.getfullargspec(dat)
+        else:
+          argspec = inspect.getargspec(dat)
 
         printed_args = [e for e in argspec.args]
         if argspec.varargs:
           printed_args.append('*' + argspec.varargs)
-        if argspec.keywords:
-          printed_args.append('**' + argspec.keywords)
+
+        if is_python3:
+          if argspec.varkw:
+            printed_args.append('**' + argspec.varkw)
+          if argspec.kwonlyargs:
+            printed_args.extend(argspec.kwonlyargs)
+        else:
+          if argspec.keywords:
+            printed_args.append('**' + argspec.keywords)
 
         func_name = get_name(dat)
         pretty_name = func_name + '(' + ', '.join(printed_args) + ')'
diff --git a/v3/tests/backend-tests/py3_func_annotations.golden_py3 b/v3/tests/backend-tests/py3_func_annotations.golden_py3
index 4dd046e9e..20571a78e 100644
--- a/v3/tests/backend-tests/py3_func_annotations.golden_py3
+++ b/v3/tests/backend-tests/py3_func_annotations.golden_py3
@@ -12,8 +12,27 @@
       "event": "step_line"
     }, 
     {
-      "exception_msg": "ValueError: Function has keyword-only arguments or annotations, use getfullargspec() API which can support them", 
-      "event": "uncaught_exception"
+      "ordered_globals": [
+        "remove_by_name"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "remove_by_name": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "remove_by_name(L, name)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "return"
     }
   ]
 }
diff --git a/v3/tests/backend-tests/py3_kwonly_args.golden b/v3/tests/backend-tests/py3_kwonly_args.golden
new file mode 100644
index 000000000..f8bfc9a22
--- /dev/null
+++ b/v3/tests/backend-tests/py3_kwonly_args.golden
@@ -0,0 +1,11 @@
+{
+  "code": "# Python 3 keyword-only arguments\ndef my_sorted(iterable, *, reverse=False, key=None):\n  pass\n", 
+  "trace": [
+    {
+      "exception_msg": "SyntaxError: invalid syntax (, line 2)", 
+      "line": 2, 
+      "event": "uncaught_exception", 
+      "offset": 26
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/py3_kwonly_args.golden_py3 b/v3/tests/backend-tests/py3_kwonly_args.golden_py3
new file mode 100644
index 000000000..2affddfb3
--- /dev/null
+++ b/v3/tests/backend-tests/py3_kwonly_args.golden_py3
@@ -0,0 +1,38 @@
+{
+  "code": "# Python 3 keyword-only arguments\ndef my_sorted(iterable, *, reverse=False, key=None):\n  pass\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "my_sorted"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "my_sorted": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "my_sorted(iterable, reverse, key)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/py3_kwonly_args.txt b/v3/tests/backend-tests/py3_kwonly_args.txt
new file mode 100644
index 000000000..e49a8d85a
--- /dev/null
+++ b/v3/tests/backend-tests/py3_kwonly_args.txt
@@ -0,0 +1,3 @@
+# Python 3 keyword-only arguments
+def my_sorted(iterable, *, reverse=False, key=None):
+  pass

From a6ec9d6656a7d1de669c3932a7eb2f03e57c306b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 24 Sep 2012 16:21:08 -0700
Subject: [PATCH 434/502] ignore __repr__ calls too

---
 v3/pg_logger.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/v3/pg_logger.py b/v3/pg_logger.py
index 6818bdbc7..2d2aae4c4 100644
--- a/v3/pg_logger.py
+++ b/v3/pg_logger.py
@@ -323,6 +323,16 @@ def interaction(self, frame, traceback, event_type):
           # also don't trace inside of the magic "constructor" code
           if cur_frame.f_code.co_name == '__new__':
             return
+          # or __repr__, which is often called when running print statements
+          if cur_frame.f_code.co_name == '__repr__':
+            return
+
+
+        # debug ...
+        #print('===', file=sys.stderr)
+        #for (e,ln) in self.stack:
+        #  print(e.f_code.co_name + ' ' + e.f_code.co_filename + ' ' + str(ln), file=sys.stderr)
+        #print('', file=sys.stderr)
 
 
         # don't trace inside of our __restricted_import__ helper function

From d428455df2a18bc287f6a7ad01518138b203e153 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 24 Sep 2012 16:38:03 -0700
Subject: [PATCH 435/502] added yet another regression test

---
 v3/tests/backend-tests/restaurants.golden     | 5541 +++++++++++++
 v3/tests/backend-tests/restaurants.golden_py3 | 6936 +++++++++++++++++
 v3/tests/backend-tests/restaurants.txt        |   16 +
 3 files changed, 12493 insertions(+)
 create mode 100644 v3/tests/backend-tests/restaurants.golden
 create mode 100644 v3/tests/backend-tests/restaurants.golden_py3
 create mode 100644 v3/tests/backend-tests/restaurants.txt

diff --git a/v3/tests/backend-tests/restaurants.golden b/v3/tests/backend-tests/restaurants.golden
new file mode 100644
index 000000000..5d9d1a8d6
--- /dev/null
+++ b/v3/tests/backend-tests/restaurants.golden
@@ -0,0 +1,5541 @@
+{
+  "code": "# Adapted from an example by David G. Kay\nfrom collections import namedtuple\n\nRestaurant = namedtuple('Restaurant', 'name cuisine phone dish price')\n\nR1 = Restaurant(\"Taillevent\", \"French\", \"343-3434\", \"Escargots\", 24.50)\nR2 = Restaurant(\"La Tour D'Argent\", \"French\", \"343-3344\", \"Ris de Veau\", 48.50)\nR3 = Restaurant(\"Pascal\", \"French\", \"333-4444\", \"Bouillabaisse\", 32.00)\nR4 = Restaurant(\"Thai Touch\", \"Thai\", \"444-3333\", \"Mee Krob\", 10.95)\nR5 = Restaurant(\"Thai Dishes\", \"Thai\", \"333-4433\", \"Paht Woon Sen\",  8.50)\nR6 = Restaurant(\"Thai Spoon\", \"Thai\", \"334-3344\", \"Mussamun\", 9.00)\n\nRL = [R1, R2, R3, R4, R5, R6]\n\nFrenchRestaurants = [r for r in RL if r.cuisine==\"French\"]\nprint(FrenchRestaurants)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "namedtuple"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "namedtuple": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "namedtuple(typename, field_names, verbose, rename)", 
+          null
+        ]
+      }, 
+      "line": 4, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "namedtuple", 
+        "Restaurant"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "namedtuple": [
+          "REF", 
+          1
+        ], 
+        "Restaurant": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "namedtuple(typename, field_names, verbose, rename)", 
+          null
+        ], 
+        "2": [
+          "CLASS", 
+          "Restaurant", 
+          [
+            "tuple"
+          ], 
+          [
+            "__getnewargs__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__new__", 
+            [
+              "REF", 
+              4
+            ]
+          ], 
+          [
+            "__repr__", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__slots__", 
+            [
+              "REF", 
+              6
+            ]
+          ], 
+          [
+            "_asdict", 
+            [
+              "REF", 
+              7
+            ]
+          ], 
+          [
+            "_fields", 
+            [
+              "REF", 
+              8
+            ]
+          ], 
+          [
+            "_make", 
+            [
+              "REF", 
+              9
+            ]
+          ], 
+          [
+            "_replace", 
+            [
+              "REF", 
+              10
+            ]
+          ], 
+          [
+            "cuisine", 
+            [
+              "REF", 
+              11
+            ]
+          ], 
+          [
+            "dish", 
+            [
+              "REF", 
+              12
+            ]
+          ], 
+          [
+            "name", 
+            [
+              "REF", 
+              13
+            ]
+          ], 
+          [
+            "phone", 
+            [
+              "REF", 
+              14
+            ]
+          ], 
+          [
+            "price", 
+            [
+              "REF", 
+              15
+            ]
+          ]
+        ], 
+        "3": [
+          "FUNCTION", 
+          "__getnewargs__(self)", 
+          null
+        ], 
+        "4": [
+          "staticmethod", 
+          ""
+        ], 
+        "5": [
+          "FUNCTION", 
+          "__repr__(self)", 
+          null
+        ], 
+        "6": [
+          "TUPLE"
+        ], 
+        "7": [
+          "FUNCTION", 
+          "_asdict(self)", 
+          null
+        ], 
+        "8": [
+          "TUPLE", 
+          "name", 
+          "cuisine", 
+          "phone", 
+          "dish", 
+          "price"
+        ], 
+        "9": [
+          "classmethod", 
+          ""
+        ], 
+        "10": [
+          "FUNCTION", 
+          "_replace(_self, **kwds)", 
+          null
+        ], 
+        "11": [
+          "property", 
+          ""
+        ], 
+        "12": [
+          "property", 
+          ""
+        ], 
+        "13": [
+          "property", 
+          ""
+        ], 
+        "14": [
+          "property", 
+          ""
+        ], 
+        "15": [
+          "property", 
+          ""
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "namedtuple", 
+        "Restaurant", 
+        "R1"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "namedtuple": [
+          "REF", 
+          1
+        ], 
+        "R1": [
+          "REF", 
+          16
+        ], 
+        "Restaurant": [
+          "REF", 
+          2
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "namedtuple(typename, field_names, verbose, rename)", 
+          null
+        ], 
+        "2": [
+          "CLASS", 
+          "Restaurant", 
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+          ], 
+          [
+            "price", 
+            [
+              "REF", 
+              15
+            ]
+          ]
+        ], 
+        "3": [
+          "FUNCTION", 
+          "__getnewargs__(self)", 
+          null
+        ], 
+        "4": [
+          "staticmethod", 
+          ""
+        ], 
+        "5": [
+          "FUNCTION", 
+          "__repr__(self)", 
+          null
+        ], 
+        "6": [
+          "TUPLE"
+        ], 
+        "7": [
+          "FUNCTION", 
+          "_asdict(self)", 
+          null
+        ], 
+        "8": [
+          "TUPLE", 
+          "name", 
+          "cuisine", 
+          "phone", 
+          "dish", 
+          "price"
+        ], 
+        "9": [
+          "classmethod", 
+          ""
+        ], 
+        "10": [
+          "FUNCTION", 
+          "_replace(_self, **kwds)", 
+          null
+        ], 
+        "11": [
+          "property", 
+          ""
+        ], 
+        "12": [
+          "property", 
+          ""
+        ], 
+        "13": [
+          "property", 
+          ""
+        ], 
+        "14": [
+          "property", 
+          ""
+        ], 
+        "15": [
+          "property", 
+          ""
+        ], 
+        "16": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Escargots"
+          ], 
+          [
+            "name", 
+            "Taillevent"
+          ], 
+          [
+            "phone", 
+            "343-3434"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
+        ], 
+        "17": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Ris de Veau"
+          ], 
+          [
+            "name", 
+            "La Tour D'Argent"
+          ], 
+          [
+            "phone", 
+            "343-3344"
+          ], 
+          [
+            "price", 
+            48.500
+          ]
+        ], 
+        "18": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Bouillabaisse"
+          ], 
+          [
+            "name", 
+            "Pascal"
+          ], 
+          [
+            "phone", 
+            "333-4444"
+          ], 
+          [
+            "price", 
+            32.000
+          ]
+        ], 
+        "19": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mee Krob"
+          ], 
+          [
+            "name", 
+            "Thai Touch"
+          ], 
+          [
+            "phone", 
+            "444-3333"
+          ], 
+          [
+            "price", 
+            10.950
+          ]
+        ], 
+        "20": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Paht Woon Sen"
+          ], 
+          [
+            "name", 
+            "Thai Dishes"
+          ], 
+          [
+            "phone", 
+            "333-4433"
+          ], 
+          [
+            "price", 
+            8.500
+          ]
+        ], 
+        "21": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mussamun"
+          ], 
+          [
+            "name", 
+            "Thai Spoon"
+          ], 
+          [
+            "phone", 
+            "334-3344"
+          ], 
+          [
+            "price", 
+            9.000
+          ]
+        ], 
+        "22": [
+          "LIST", 
+          [
+            "REF", 
+            16
+          ], 
+          [
+            "REF", 
+            17
+          ], 
+          [
+            "REF", 
+            18
+          ], 
+          [
+            "REF", 
+            19
+          ], 
+          [
+            "REF", 
+            20
+          ], 
+          [
+            "REF", 
+            21
+          ]
+        ], 
+        "23": [
+          "LIST", 
+          [
+            "REF", 
+            16
+          ], 
+          [
+            "REF", 
+            17
+          ], 
+          [
+            "REF", 
+            18
+          ]
+        ]
+      }, 
+      "line": 16, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/restaurants.golden_py3 b/v3/tests/backend-tests/restaurants.golden_py3
new file mode 100644
index 000000000..e689bdf47
--- /dev/null
+++ b/v3/tests/backend-tests/restaurants.golden_py3
@@ -0,0 +1,6936 @@
+{
+  "code": "# Adapted from an example by David G. Kay\nfrom collections import namedtuple\n\nRestaurant = namedtuple('Restaurant', 'name cuisine phone dish price')\n\nR1 = Restaurant(\"Taillevent\", \"French\", \"343-3434\", \"Escargots\", 24.50)\nR2 = Restaurant(\"La Tour D'Argent\", \"French\", \"343-3344\", \"Ris de Veau\", 48.50)\nR3 = Restaurant(\"Pascal\", \"French\", \"333-4444\", \"Bouillabaisse\", 32.00)\nR4 = Restaurant(\"Thai Touch\", \"Thai\", \"444-3333\", \"Mee Krob\", 10.95)\nR5 = Restaurant(\"Thai Dishes\", \"Thai\", \"333-4433\", \"Paht Woon Sen\",  8.50)\nR6 = Restaurant(\"Thai Spoon\", \"Thai\", \"334-3344\", \"Mussamun\", 9.00)\n\nRL = [R1, R2, R3, R4, R5, R6]\n\nFrenchRestaurants = [r for r in RL if r.cuisine==\"French\"]\nprint(FrenchRestaurants)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "namedtuple"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "namedtuple": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
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+          "FUNCTION", 
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+        ]
+      }, 
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "namedtuple", 
+        "Restaurant"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "namedtuple": [
+          "REF", 
+          1
+        ], 
+        "Restaurant": [
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+          2
+        ]
+      }, 
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+        ], 
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+          [
+            "tuple"
+          ], 
+          [
+            "__getnewargs__", 
+            [
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+              3
+            ]
+          ], 
+          [
+            "__new__", 
+            [
+              "REF", 
+              4
+            ]
+          ], 
+          [
+            "__repr__", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__slots__", 
+            [
+              "REF", 
+              6
+            ]
+          ], 
+          [
+            "_asdict", 
+            [
+              "REF", 
+              7
+            ]
+          ], 
+          [
+            "_fields", 
+            [
+              "REF", 
+              8
+            ]
+          ], 
+          [
+            "_make", 
+            [
+              "REF", 
+              9
+            ]
+          ], 
+          [
+            "_replace", 
+            [
+              "REF", 
+              10
+            ]
+          ], 
+          [
+            "cuisine", 
+            [
+              "REF", 
+              11
+            ]
+          ], 
+          [
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+            [
+              "REF", 
+              12
+            ]
+          ], 
+          [
+            "name", 
+            [
+              "REF", 
+              13
+            ]
+          ], 
+          [
+            "phone", 
+            [
+              "REF", 
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+            ]
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+            ]
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+        ], 
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+          "FUNCTION", 
+          "__repr__(self)", 
+          null
+        ], 
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+          "TUPLE"
+        ], 
+        "7": [
+          "FUNCTION", 
+          "_asdict(self)", 
+          null
+        ], 
+        "8": [
+          "TUPLE", 
+          "name", 
+          "cuisine", 
+          "phone", 
+          "dish", 
+          "price"
+        ], 
+        "9": [
+          "INSTANCE", 
+          "classmethod"
+        ], 
+        "10": [
+          "FUNCTION", 
+          "_replace(_self, **kwds)", 
+          null
+        ], 
+        "11": [
+          "INSTANCE", 
+          "property"
+        ], 
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+        ], 
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+          "property"
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "namedtuple", 
+        "Restaurant", 
+        "R1"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
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+        ]
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+              4
+            ]
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+            ]
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+        ], 
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+          "INSTANCE", 
+          "classmethod"
+        ], 
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+          null
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+          "INSTANCE", 
+          "property"
+        ], 
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+        ], 
+        "15": [
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+        ], 
+        "16": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Escargots"
+          ], 
+          [
+            "name", 
+            "Taillevent"
+          ], 
+          [
+            "phone", 
+            "343-3434"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
+        ]
+      }, 
+      "line": 7, 
+      "event": "step_line"
+    }, 
+    {
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+        "namedtuple", 
+        "Restaurant", 
+        "R1", 
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+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
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+        ]
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+          "property"
+        ], 
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+          "Restaurant", 
+          [
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+            "French"
+          ], 
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+            "Escargots"
+          ], 
+          [
+            "name", 
+            "Taillevent"
+          ], 
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+          ], 
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+          ]
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+          ], 
+          [
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+          ], 
+          [
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+            48.500
+          ]
+        ]
+      }, 
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+      "event": "step_line"
+    }, 
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+        ], 
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+          ], 
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+          [
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+          ], 
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+          ], 
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+            48.500
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+          ]
+        ]
+      }, 
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+      "event": "return"
+    }, 
+    {
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+        "R3", 
+        "R4", 
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+        "RL", 
+        "FrenchRestaurants"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "R4": [
+          "REF", 
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+        "namedtuple": [
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+        ], 
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+        ], 
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+        ], 
+        "Restaurant": [
+          "REF", 
+          2
+        ], 
+        "R3": [
+          "REF", 
+          18
+        ], 
+        "FrenchRestaurants": [
+          "REF", 
+          24
+        ], 
+        "R5": [
+          "REF", 
+          20
+        ], 
+        "RL": [
+          "REF", 
+          22
+        ]
+      }, 
+      "heap": {
+        "1": [
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+          "namedtuple(typename, field_names, verbose, rename)", 
+          null
+        ], 
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+          ], 
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+            ]
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+            ]
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+            ]
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+            ]
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+            ]
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+            ]
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+            ]
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+            ]
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+            ]
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+            ]
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+          "property"
+        ], 
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+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Escargots"
+          ], 
+          [
+            "name", 
+            "Taillevent"
+          ], 
+          [
+            "phone", 
+            "343-3434"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
+        ], 
+        "17": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Ris de Veau"
+          ], 
+          [
+            "name", 
+            "La Tour D'Argent"
+          ], 
+          [
+            "phone", 
+            "343-3344"
+          ], 
+          [
+            "price", 
+            48.500
+          ]
+        ], 
+        "18": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Bouillabaisse"
+          ], 
+          [
+            "name", 
+            "Pascal"
+          ], 
+          [
+            "phone", 
+            "333-4444"
+          ], 
+          [
+            "price", 
+            32.000
+          ]
+        ], 
+        "19": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mee Krob"
+          ], 
+          [
+            "name", 
+            "Thai Touch"
+          ], 
+          [
+            "phone", 
+            "444-3333"
+          ], 
+          [
+            "price", 
+            10.950
+          ]
+        ], 
+        "20": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Paht Woon Sen"
+          ], 
+          [
+            "name", 
+            "Thai Dishes"
+          ], 
+          [
+            "phone", 
+            "333-4433"
+          ], 
+          [
+            "price", 
+            8.500
+          ]
+        ], 
+        "21": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mussamun"
+          ], 
+          [
+            "name", 
+            "Thai Spoon"
+          ], 
+          [
+            "phone", 
+            "334-3344"
+          ], 
+          [
+            "price", 
+            9.000
+          ]
+        ], 
+        "22": [
+          "LIST", 
+          [
+            "REF", 
+            16
+          ], 
+          [
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+            17
+          ], 
+          [
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+            18
+          ], 
+          [
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+            19
+          ], 
+          [
+            "REF", 
+            20
+          ], 
+          [
+            "REF", 
+            21
+          ]
+        ], 
+        "24": [
+          "LIST", 
+          [
+            "REF", 
+            16
+          ], 
+          [
+            "REF", 
+            17
+          ], 
+          [
+            "REF", 
+            18
+          ]
+        ]
+      }, 
+      "line": 16, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "namedtuple", 
+        "Restaurant", 
+        "R1", 
+        "R2", 
+        "R3", 
+        "R4", 
+        "R5", 
+        "R6", 
+        "RL", 
+        "FrenchRestaurants"
+      ], 
+      "stdout": "[Restaurant(name='Taillevent', cuisine='French', phone='343-3434', dish='Escargots', price=24.5), Restaurant(name=\"La Tour D'Argent\", cuisine='French', phone='343-3344', dish='Ris de Veau', price=48.5), Restaurant(name='Pascal', cuisine='French', phone='333-4444', dish='Bouillabaisse', price=32.0)]\n", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "R4": [
+          "REF", 
+          19
+        ], 
+        "namedtuple": [
+          "REF", 
+          1
+        ], 
+        "R6": [
+          "REF", 
+          21
+        ], 
+        "R1": [
+          "REF", 
+          16
+        ], 
+        "R2": [
+          "REF", 
+          17
+        ], 
+        "Restaurant": [
+          "REF", 
+          2
+        ], 
+        "R3": [
+          "REF", 
+          18
+        ], 
+        "FrenchRestaurants": [
+          "REF", 
+          24
+        ], 
+        "R5": [
+          "REF", 
+          20
+        ], 
+        "RL": [
+          "REF", 
+          22
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "namedtuple(typename, field_names, verbose, rename)", 
+          null
+        ], 
+        "2": [
+          "CLASS", 
+          "Restaurant", 
+          [
+            "tuple"
+          ], 
+          [
+            "__getnewargs__", 
+            [
+              "REF", 
+              3
+            ]
+          ], 
+          [
+            "__new__", 
+            [
+              "REF", 
+              4
+            ]
+          ], 
+          [
+            "__repr__", 
+            [
+              "REF", 
+              5
+            ]
+          ], 
+          [
+            "__slots__", 
+            [
+              "REF", 
+              6
+            ]
+          ], 
+          [
+            "_asdict", 
+            [
+              "REF", 
+              7
+            ]
+          ], 
+          [
+            "_fields", 
+            [
+              "REF", 
+              8
+            ]
+          ], 
+          [
+            "_make", 
+            [
+              "REF", 
+              9
+            ]
+          ], 
+          [
+            "_replace", 
+            [
+              "REF", 
+              10
+            ]
+          ], 
+          [
+            "cuisine", 
+            [
+              "REF", 
+              11
+            ]
+          ], 
+          [
+            "dish", 
+            [
+              "REF", 
+              12
+            ]
+          ], 
+          [
+            "name", 
+            [
+              "REF", 
+              13
+            ]
+          ], 
+          [
+            "phone", 
+            [
+              "REF", 
+              14
+            ]
+          ], 
+          [
+            "price", 
+            [
+              "REF", 
+              15
+            ]
+          ]
+        ], 
+        "3": [
+          "FUNCTION", 
+          "__getnewargs__(self)", 
+          null
+        ], 
+        "4": [
+          "INSTANCE", 
+          "staticmethod"
+        ], 
+        "5": [
+          "FUNCTION", 
+          "__repr__(self)", 
+          null
+        ], 
+        "6": [
+          "TUPLE"
+        ], 
+        "7": [
+          "FUNCTION", 
+          "_asdict(self)", 
+          null
+        ], 
+        "8": [
+          "TUPLE", 
+          "name", 
+          "cuisine", 
+          "phone", 
+          "dish", 
+          "price"
+        ], 
+        "9": [
+          "INSTANCE", 
+          "classmethod"
+        ], 
+        "10": [
+          "FUNCTION", 
+          "_replace(_self, **kwds)", 
+          null
+        ], 
+        "11": [
+          "INSTANCE", 
+          "property"
+        ], 
+        "12": [
+          "INSTANCE", 
+          "property"
+        ], 
+        "13": [
+          "INSTANCE", 
+          "property"
+        ], 
+        "14": [
+          "INSTANCE", 
+          "property"
+        ], 
+        "15": [
+          "INSTANCE", 
+          "property"
+        ], 
+        "16": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Escargots"
+          ], 
+          [
+            "name", 
+            "Taillevent"
+          ], 
+          [
+            "phone", 
+            "343-3434"
+          ], 
+          [
+            "price", 
+            24.500
+          ]
+        ], 
+        "17": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Ris de Veau"
+          ], 
+          [
+            "name", 
+            "La Tour D'Argent"
+          ], 
+          [
+            "phone", 
+            "343-3344"
+          ], 
+          [
+            "price", 
+            48.500
+          ]
+        ], 
+        "18": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "French"
+          ], 
+          [
+            "dish", 
+            "Bouillabaisse"
+          ], 
+          [
+            "name", 
+            "Pascal"
+          ], 
+          [
+            "phone", 
+            "333-4444"
+          ], 
+          [
+            "price", 
+            32.000
+          ]
+        ], 
+        "19": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mee Krob"
+          ], 
+          [
+            "name", 
+            "Thai Touch"
+          ], 
+          [
+            "phone", 
+            "444-3333"
+          ], 
+          [
+            "price", 
+            10.950
+          ]
+        ], 
+        "20": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Paht Woon Sen"
+          ], 
+          [
+            "name", 
+            "Thai Dishes"
+          ], 
+          [
+            "phone", 
+            "333-4433"
+          ], 
+          [
+            "price", 
+            8.500
+          ]
+        ], 
+        "21": [
+          "INSTANCE", 
+          "Restaurant", 
+          [
+            "cuisine", 
+            "Thai"
+          ], 
+          [
+            "dish", 
+            "Mussamun"
+          ], 
+          [
+            "name", 
+            "Thai Spoon"
+          ], 
+          [
+            "phone", 
+            "334-3344"
+          ], 
+          [
+            "price", 
+            9.000
+          ]
+        ], 
+        "22": [
+          "LIST", 
+          [
+            "REF", 
+            16
+          ], 
+          [
+            "REF", 
+            17
+          ], 
+          [
+            "REF", 
+            18
+          ], 
+          [
+            "REF", 
+            19
+          ], 
+          [
+            "REF", 
+            20
+          ], 
+          [
+            "REF", 
+            21
+          ]
+        ], 
+        "24": [
+          "LIST", 
+          [
+            "REF", 
+            16
+          ], 
+          [
+            "REF", 
+            17
+          ], 
+          [
+            "REF", 
+            18
+          ]
+        ]
+      }, 
+      "line": 16, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/restaurants.txt b/v3/tests/backend-tests/restaurants.txt
new file mode 100644
index 000000000..3d7c3b186
--- /dev/null
+++ b/v3/tests/backend-tests/restaurants.txt
@@ -0,0 +1,16 @@
+# Adapted from an example by David G. Kay
+from collections import namedtuple
+
+Restaurant = namedtuple('Restaurant', 'name cuisine phone dish price')
+
+R1 = Restaurant("Taillevent", "French", "343-3434", "Escargots", 24.50)
+R2 = Restaurant("La Tour D'Argent", "French", "343-3344", "Ris de Veau", 48.50)
+R3 = Restaurant("Pascal", "French", "333-4444", "Bouillabaisse", 32.00)
+R4 = Restaurant("Thai Touch", "Thai", "444-3333", "Mee Krob", 10.95)
+R5 = Restaurant("Thai Dishes", "Thai", "333-4433", "Paht Woon Sen",  8.50)
+R6 = Restaurant("Thai Spoon", "Thai", "334-3344", "Mussamun", 9.00)
+
+RL = [R1, R2, R3, R4, R5, R6]
+
+FrenchRestaurants = [r for r in RL if r.cuisine=="French"]
+print(FrenchRestaurants)

From 17d2930745dbad45f25a295a69ade5e1ab76f3b8 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 24 Sep 2012 20:12:36 -0700
Subject: [PATCH 436/502] lovely

---
 v3/tests/backend-tests/john-lambda-lambda.txt | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 v3/tests/backend-tests/john-lambda-lambda.txt

diff --git a/v3/tests/backend-tests/john-lambda-lambda.txt b/v3/tests/backend-tests/john-lambda-lambda.txt
new file mode 100644
index 000000000..61a0d2fb5
--- /dev/null
+++ b/v3/tests/backend-tests/john-lambda-lambda.txt
@@ -0,0 +1,5 @@
+# another gem from john denero ...
+def a(b):
+    a, b = b(3)
+
+a(lambda a: (lambda b: a, a))

From 2216e848b6aa6c4b0fdba58b542ab0a4e8827d3e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 1 Oct 2012 10:08:01 -0700
Subject: [PATCH 437/502] get ready to write embedding-HOWTO.md

---
 v3/docs/embedding-HOWTO.md  | 20 ++++++++++++++++++++
 v3/docs/embedding-HOWTO.txt |  8 +++-----
 v3/index.html               |  2 +-
 3 files changed, 24 insertions(+), 6 deletions(-)
 create mode 100644 v3/docs/embedding-HOWTO.md

diff --git a/v3/docs/embedding-HOWTO.md b/v3/docs/embedding-HOWTO.md
new file mode 100644
index 000000000..4b0e8281e
--- /dev/null
+++ b/v3/docs/embedding-HOWTO.md
@@ -0,0 +1,20 @@
+# Embedding Online Python Tutor visualizations
+
+This document is a starting point for anyone who wants to embed
+Online Python Tutor (OPT) visualizations in their webpage. View it online at:
+
+https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/embedd.md
+
+Look at the Git history to see when this document was last updated; the more time
+elapsed since that date, the more likely things are out-of-date.
+
+I'm assuming that you're competent in Python, JavaScript, command-line-fu, and Google-fu,
+so I won't do much hand-holding in these directions.
+
+This guide isn't meant to be comprehensive; you will undoubtedly still
+be confused about details after reading it, so feel free to email
+philip@pgbovine.net if you have questions.
+
+And please excuse the sloppy writing; I'm not trying to win any style awards here :)
+
+
diff --git a/v3/docs/embedding-HOWTO.txt b/v3/docs/embedding-HOWTO.txt
index 268b50dad..49944948d 100644
--- a/v3/docs/embedding-HOWTO.txt
+++ b/v3/docs/embedding-HOWTO.txt
@@ -1,6 +1,4 @@
-Instructions for embedding Online Python Tutor visualizations
-------
+This document has been moved to embedding-HOWTO.md
 
-[Full documentation coming soon! For now, please email philip@pgbovine.net]
-
-[TODO: move to GitHub Markdown format]
+View it online at:
+https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/embedding-HOWTO.md
diff --git a/v3/index.html b/v3/index.html
index 35462a9f9..ed6ce82ed 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -127,7 +127,7 @@ 
    LEARN programming by vi
 
    EMBED visualizations in digital textbooks
    
 
 
    Using a single line of JavaScript code, you can embed an Online Python Tutor
+href="https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/embedding-HOWTO.md">embed an Online Python Tutor
 visualization within your web page (as shown in the “Learn”
 box above). The screenshot below shows a few of these visualizations
 embedded within the online textbook for the introductory CS course at UC

From 72d4dde33c04af17be2943069d38c0ae58860958 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 1 Oct 2012 10:33:21 -0700
Subject: [PATCH 438/502] Update v3/docs/embedding-HOWTO.md

---
 v3/docs/embedding-HOWTO.md | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/v3/docs/embedding-HOWTO.md b/v3/docs/embedding-HOWTO.md
index 4b0e8281e..469818ac4 100644
--- a/v3/docs/embedding-HOWTO.md
+++ b/v3/docs/embedding-HOWTO.md
@@ -3,7 +3,7 @@
 This document is a starting point for anyone who wants to embed
 Online Python Tutor (OPT) visualizations in their webpage. View it online at:
 
-https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/embedd.md
+https://github.com/pgbovine/OnlinePythonTutor/edit/master/v3/docs/embedding-HOWTO.md
 
 Look at the Git history to see when this document was last updated; the more time
 elapsed since that date, the more likely things are out-of-date.
@@ -18,3 +18,17 @@ philip@pgbovine.net if you have questions.
 And please excuse the sloppy writing; I'm not trying to win any style awards here :)
 
 
+## High-Level Overview
+
+To embed a visualization, you:
+
+1. Run the target Python program offline to generate an execution trace, which is one (really, really long)
+string representing a JavaScript (JSON) object.
+2. Copy that long string into a JavaScript .js file.
+3. Include some other stuff in your .js file and then embed it within your HTML webpage.
+
+Note that the embedded visualization is **read-only** -- that is, the user can interact with the visualization
+by stepping forward and backward, but they cannot edit the code.
+
+If the user wants to click the 'Edit code' button to edit the code, then they are
+brought to the [code editor page](http://pythontutor.com/visualize.html).

From 1ab02ec13a212e81424bb6b71be0f5e50e08e892 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 1 Oct 2012 10:35:45 -0700
Subject: [PATCH 439/502] tiny

---
 v3/{embedding-test.html => embedding-demo.html} | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 rename v3/{embedding-test.html => embedding-demo.html} (100%)

diff --git a/v3/embedding-test.html b/v3/embedding-demo.html
similarity index 100%
rename from v3/embedding-test.html
rename to v3/embedding-demo.html

From 03261e6c285e42fdf728cfd0b2906467cbb7a62c Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 1 Oct 2012 10:38:51 -0700
Subject: [PATCH 440/502] Update v3/docs/embedding-HOWTO.md

---
 v3/docs/embedding-HOWTO.md | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/v3/docs/embedding-HOWTO.md b/v3/docs/embedding-HOWTO.md
index 469818ac4..7b5eb75a5 100644
--- a/v3/docs/embedding-HOWTO.md
+++ b/v3/docs/embedding-HOWTO.md
@@ -32,3 +32,13 @@ by stepping forward and backward, but they cannot edit the code.
 
 If the user wants to click the 'Edit code' button to edit the code, then they are
 brought to the [code editor page](http://pythontutor.com/visualize.html).
+
+
+## The Nitty-Gritty
+
+Let's attempt to go [literate programming](http://en.wikipedia.org/wiki/Literate_programming) style now ... load up
+[v3/embedding-demo.html](https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/embedding-demo.html) in
+your browser to see a demo. And then view its source code and follow the instructions there, which should
+lead you to [v3/embedding-demo.js](https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/embedding-demo.js).
+
+Everything you need to know should be in the demo code!

From ec5ad2b3e485c83ff289efbb48917084f25b0ab8 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 1 Oct 2012 10:39:41 -0700
Subject: [PATCH 441/502] Update v3/docs/embedding-HOWTO.md

---
 v3/docs/embedding-HOWTO.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/docs/embedding-HOWTO.md b/v3/docs/embedding-HOWTO.md
index 7b5eb75a5..f11975367 100644
--- a/v3/docs/embedding-HOWTO.md
+++ b/v3/docs/embedding-HOWTO.md
@@ -3,7 +3,7 @@
 This document is a starting point for anyone who wants to embed
 Online Python Tutor (OPT) visualizations in their webpage. View it online at:
 
-https://github.com/pgbovine/OnlinePythonTutor/edit/master/v3/docs/embedding-HOWTO.md
+https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/embedding-HOWTO.md
 
 Look at the Git history to see when this document was last updated; the more time
 elapsed since that date, the more likely things are out-of-date.

From bc5ab40ca9e9651850ded0f380acfa3daf9df967 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 1 Oct 2012 11:55:12 -0700
Subject: [PATCH 442/502] added skeleton of OPT embedding demo

---
 v3/embedding-demo.html                     |   33 +-
 v3/embedding-demo.js                       |   45 +
 v3/embedding-examples.js                   |   33 -
 v3/generate_json_trace.py                  |   20 +-
 v3/tests/backend-tests/list_sum.golden     | 2125 ++++++++++++++++++++
 v3/tests/backend-tests/list_sum.golden_py3 | 2125 ++++++++++++++++++++
 v3/tests/backend-tests/list_sum.txt        |    9 +
 7 files changed, 4345 insertions(+), 45 deletions(-)
 create mode 100644 v3/embedding-demo.js
 delete mode 100644 v3/embedding-examples.js
 create mode 100644 v3/tests/backend-tests/list_sum.golden
 create mode 100644 v3/tests/backend-tests/list_sum.golden_py3
 create mode 100644 v3/tests/backend-tests/list_sum.txt

diff --git a/v3/embedding-demo.html b/v3/embedding-demo.html
index f6fbd56d8..ac025e96b 100644
--- a/v3/embedding-demo.html
+++ b/v3/embedding-demo.html
@@ -2,9 +2,9 @@
 
 
 
-  Online Python Tutor embedding test
+  Online Python Tutor embedding demo
 
-
+
 
 
  
@@ -12,29 +12,42 @@
  
 
 
+
+
 
 
 
 
-
+
+
 
 
 
 
 
-
    Stuff:
    
+
 
-
    
+  
    Recursive list sum (from pythontutor.com home page):
    
 
-
    Aliasing 5:
    
+  
    
 
-
    
 
-
    Towers of Hanoi:
    
+  
    Towers of Hanoi:
    
 
-
    
+  
    
+
+
+  
    Happy Birthday:
    
+
+  
    
 
 
 
-
diff --git a/v3/embedding-demo.js b/v3/embedding-demo.js
new file mode 100644
index 000000000..861017e82
--- /dev/null
+++ b/v3/embedding-demo.js
@@ -0,0 +1,45 @@
+// To embed Online Python Tutor visualizations into embedding-demo.html ...
+
+// 1. Run generate_json_trace.py to generate execution traces as JavaScript variables.
+//    (WARNING: The following lines are VERY LONG.)
+
+// Run:
+//   python generate_json_trace.py --create_jsvar=listSumTrace tests/backend-tests/list_sum.txt
+// and copy-and-paste the output line into here:
+var listSumTrace = {"code": "def listSum(numbers):\n  if not numbers:\n    return 0\n  else:\n    (f, rest) = numbers\n    return f + listSum(rest)\n\nmyList = (1, (2, (3, None)))\ntotal = listSum(myList)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 1, "event": "step_line"}, {"ordered_globals": ["listSum"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null]}, "line": 8, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 9, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 1, "event": "call"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 1, "event": "call"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 1, "event": "call"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4], "rest": null, "f": 3}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4], "rest": null, "f": 3}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 4, "encoded_locals": {"numbers": null}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f4", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 1, "event": "call"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4], "rest": null, "f": 3}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 4, "encoded_locals": {"numbers": null}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f4", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4], "rest": null, "f": 3}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 4, "encoded_locals": {"numbers": null}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f4", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4], "rest": null, "f": 3}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 4, "encoded_locals": {"__return__": 0, "numbers": null}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f4", "ordered_varnames": ["numbers", "__return__"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 3, "event": "return"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"__return__": 3, "numbers": ["REF", 4], "rest": null, "f": 3}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest", "__return__"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "return"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"__return__": 5, "numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest", "__return__"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "return"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"__return__": 6, "numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest", "__return__"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "return"}, {"ordered_globals": ["listSum", "myList", "total"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"total": 6, "myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 9, "event": "return"}]};
+
+// Do the same for 
+//   python generate_json_trace.py --create_jsvar=hanoiTrace tests/example-code/towers_of_hanoi.txt
+var hanoiTrace = {"code": "# move a stack of n disks from stack a to stack b,\n# using tmp as a temporary stack\ndef TowerOfHanoi(n, a, b, tmp):\n    if n == 1:\n        b.append(a.pop())\n    else:\n        TowerOfHanoi(n-1, a, tmp, b)\n        b.append(a.pop())\n        TowerOfHanoi(n-1, tmp, b, a)\n        \nstack1 = [4,3,2,1]\nstack2 = []\nstack3 = []\n      \n# transfer stack1 to stack3 using Tower of Hanoi rules\nTowerOfHanoi(len(stack1), stack1, stack3, stack2)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 3, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"TowerOfHanoi": ["REF", 1]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null]}, "line": 11, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1]}, "line": 12, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"]}, "line": 13, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 16, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": true, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f1", "ordered_varnames": ["n", "a", "b", "tmp"]}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 3, "event": "call"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": true, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f1", "ordered_varnames": ["n", "a", "b", "tmp"]}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": true, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f1", "ordered_varnames": ["n", "a", "b", "tmp"]}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 7, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f1", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 2, "encoded_locals": {"tmp": ["REF", 4], "a": ["REF", 2], "b": ["REF", 3], "n": 3}, "is_highlighted": true, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f2", "ordered_varnames": ["n", "a", "b", "tmp"]}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 3, "event": "call"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f1", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 2, "encoded_locals": {"tmp": ["REF", 4], "a": ["REF", 2], "b": ["REF", 3], "n": 3}, "is_highlighted": true, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f2", "ordered_varnames": ["n", "a", "b", "tmp"]}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f1", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 2, "encoded_locals": {"tmp": ["REF", 4], "a": ["REF", 2], "b": ["REF", 3], "n": 3}, "is_highlighted": true, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f2", "ordered_varnames": ["n", "a", "b", "tmp"]}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 7, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f1", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 2, "encoded_locals": {"tmp": ["REF", 4], "a": ["REF", 2], "b": ["REF", 3], "n": 3}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f2", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 3, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": true, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f3", "ordered_varnames": ["n", "a", "b", "tmp"]}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 4, 3, 2, 1], "3": ["LIST"], "4": ["LIST"]}, "line": 3, "event": "call"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f1", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 2, "encoded_locals": {"tmp": ["REF", 4], "a": ["REF", 2], "b": ["REF", 3], "n": 3}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f2", "ordered_varnames": ["n", "a", "b", "tmp"]}, 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"tmp"]}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 2, 1], "3": ["LIST"], "4": ["LIST", 4, 3]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f1", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 9, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f9", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 13, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f13", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 14, "encoded_locals": {"tmp": ["REF", 4], "a": ["REF", 2], "b": ["REF", 3], "n": 1}, "is_highlighted": true, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f14", "ordered_varnames": ["n", "a", "b", "tmp"]}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 2, 1], "3": ["LIST"], "4": ["LIST", 4, 3]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": 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["REF", 3], "n": 1}, "is_highlighted": true, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f14", "ordered_varnames": ["n", "a", "b", "tmp", "__return__"]}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 2], "3": ["LIST", 1], "4": ["LIST", 4, 3]}, "line": 5, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f1", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 9, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f9", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 13, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": true, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f13", "ordered_varnames": ["n", "a", "b", "tmp"]}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST", 2], "3": ["LIST", 1], "4": ["LIST", 4, 3]}, "line": 8, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": 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["LIST"], "3": ["LIST", 1], "4": ["LIST", 4, 3, 2]}, "line": 9, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f1", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 9, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f9", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 13, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f13", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 15, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 1}, "is_highlighted": true, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f15", "ordered_varnames": ["n", "a", "b", "tmp"]}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST", 1], "4": ["LIST", 4, 3, 2]}, "line": 3, "event": "call"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f1", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 9, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f9", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 13, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f13", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 15, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 1}, "is_highlighted": true, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f15", "ordered_varnames": ["n", "a", "b", "tmp"]}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST", 1], "4": ["LIST", 4, 3, 2]}, "line": 4, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f1", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 9, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f9", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 13, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f13", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 15, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 1}, "is_highlighted": true, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f15", "ordered_varnames": ["n", "a", "b", "tmp"]}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST", 1], "4": ["LIST", 4, 3, 2]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f1", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 9, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f9", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 13, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 2}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f13", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 15, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "__return__": null, "b": 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"b": ["REF", 4], "n": 3}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f9", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 13, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "__return__": null, "b": ["REF", 4], "n": 2}, "is_highlighted": true, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f13", "ordered_varnames": ["n", "a", "b", "tmp", "__return__"]}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 9, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f1", "ordered_varnames": ["n", "a", "b", "tmp"]}, {"frame_id": 9, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "__return__": null, "b": ["REF", 4], "n": 3}, "is_highlighted": true, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f9", "ordered_varnames": ["n", "a", "b", "tmp", "__return__"]}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 9, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "__return__": null, "b": ["REF", 4], "n": 4}, "is_highlighted": true, "is_parent": false, "func_name": "TowerOfHanoi", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "TowerOfHanoi_f1", "ordered_varnames": ["n", "a", "b", "tmp", "__return__"]}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 9, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 16, "event": "return"}]};
+
+// And finally, let's generate one last trace and copy it in here:
+//   python generate_json_trace.py --create_jsvar=happyTrace tests/example-code/happy.txt
+var happyTrace = {"code": "# From \"Teaching with Python\" by John Zelle\ndef happy():\n    print(\"Happy Birthday to you!\")\n\ndef sing(P):\n    happy()\n    happy()\n    print(\"Happy Birthday dear \" + P + \"!\")\n    happy()\n\n# main\nsing(\"Fred\")\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 2, "event": "step_line"}, {"ordered_globals": ["happy"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["happy", "sing"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"sing": ["REF", 2], "happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null], "2": ["FUNCTION", "sing(P)", null]}, "line": 12, "event": "step_line"}, {"ordered_globals": ["happy", "sing"], "stdout": "", "func_name": "sing", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"P": "Fred"}, "is_highlighted": true, "is_parent": false, "func_name": "sing", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sing_f1", "ordered_varnames": ["P"]}], "globals": {"sing": ["REF", 2], "happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null], "2": ["FUNCTION", "sing(P)", null]}, "line": 5, "event": "call"}, {"ordered_globals": ["happy", "sing"], "stdout": "", "func_name": "sing", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"P": "Fred"}, "is_highlighted": true, "is_parent": false, "func_name": "sing", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sing_f1", "ordered_varnames": ["P"]}], "globals": {"sing": ["REF", 2], "happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null], "2": ["FUNCTION", "sing(P)", null]}, "line": 6, "event": "step_line"}, {"ordered_globals": ["happy", "sing"], "stdout": "", "func_name": "happy", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"P": "Fred"}, "is_highlighted": false, "is_parent": false, "func_name": "sing", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sing_f1", "ordered_varnames": ["P"]}, {"frame_id": 2, "encoded_locals": {}, "is_highlighted": true, "is_parent": false, "func_name": "happy", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "happy_f2", "ordered_varnames": []}], "globals": {"sing": ["REF", 2], "happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null], "2": ["FUNCTION", "sing(P)", null]}, "line": 2, "event": "call"}, {"ordered_globals": ["happy", "sing"], "stdout": "", "func_name": "happy", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"P": "Fred"}, "is_highlighted": false, "is_parent": false, "func_name": "sing", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sing_f1", "ordered_varnames": ["P"]}, {"frame_id": 2, "encoded_locals": {}, "is_highlighted": true, "is_parent": false, "func_name": "happy", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "happy_f2", "ordered_varnames": []}], "globals": {"sing": ["REF", 2], "happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null], "2": ["FUNCTION", "sing(P)", null]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["happy", "sing"], "stdout": "Happy Birthday to you!\n", "func_name": "happy", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"P": "Fred"}, "is_highlighted": false, "is_parent": false, "func_name": "sing", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sing_f1", "ordered_varnames": ["P"]}, {"frame_id": 2, "encoded_locals": {"__return__": null}, "is_highlighted": true, "is_parent": false, "func_name": "happy", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "happy_f2", "ordered_varnames": ["__return__"]}], "globals": {"sing": ["REF", 2], "happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null], "2": ["FUNCTION", "sing(P)", null]}, "line": 3, "event": "return"}, {"ordered_globals": ["happy", "sing"], "stdout": "Happy Birthday to you!\n", "func_name": "sing", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"P": "Fred"}, "is_highlighted": true, "is_parent": false, "func_name": "sing", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sing_f1", "ordered_varnames": ["P"]}], "globals": {"sing": ["REF", 2], "happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null], "2": ["FUNCTION", "sing(P)", null]}, "line": 7, "event": "step_line"}, {"ordered_globals": ["happy", "sing"], "stdout": "Happy Birthday to you!\n", "func_name": "happy", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"P": "Fred"}, "is_highlighted": false, "is_parent": false, "func_name": "sing", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sing_f1", "ordered_varnames": ["P"]}, {"frame_id": 3, "encoded_locals": {}, "is_highlighted": true, "is_parent": false, "func_name": "happy", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "happy_f3", "ordered_varnames": []}], "globals": {"sing": ["REF", 2], "happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null], "2": ["FUNCTION", "sing(P)", null]}, "line": 2, "event": "call"}, {"ordered_globals": ["happy", "sing"], "stdout": "Happy Birthday to you!\n", "func_name": "happy", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"P": "Fred"}, "is_highlighted": false, "is_parent": false, "func_name": "sing", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sing_f1", "ordered_varnames": ["P"]}, {"frame_id": 3, "encoded_locals": {}, "is_highlighted": true, "is_parent": false, "func_name": "happy", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "happy_f3", "ordered_varnames": []}], "globals": {"sing": ["REF", 2], "happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null], "2": ["FUNCTION", "sing(P)", null]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["happy", "sing"], "stdout": "Happy Birthday to you!\nHappy Birthday to you!\n", "func_name": "happy", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"P": "Fred"}, "is_highlighted": false, "is_parent": false, "func_name": "sing", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sing_f1", "ordered_varnames": ["P"]}, {"frame_id": 3, "encoded_locals": {"__return__": null}, "is_highlighted": true, "is_parent": false, "func_name": "happy", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "happy_f3", "ordered_varnames": ["__return__"]}], "globals": {"sing": ["REF", 2], "happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null], "2": ["FUNCTION", "sing(P)", null]}, "line": 3, "event": "return"}, {"ordered_globals": ["happy", "sing"], "stdout": "Happy Birthday to you!\nHappy Birthday to you!\n", "func_name": "sing", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"P": "Fred"}, "is_highlighted": true, "is_parent": false, "func_name": "sing", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sing_f1", "ordered_varnames": ["P"]}], "globals": {"sing": ["REF", 2], "happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null], "2": ["FUNCTION", "sing(P)", null]}, "line": 8, "event": "step_line"}, {"ordered_globals": ["happy", "sing"], "stdout": "Happy Birthday to you!\nHappy Birthday to you!\nHappy Birthday dear Fred!\n", "func_name": "sing", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"P": "Fred"}, "is_highlighted": true, "is_parent": false, "func_name": "sing", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sing_f1", "ordered_varnames": ["P"]}], "globals": {"sing": ["REF", 2], "happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null], "2": ["FUNCTION", "sing(P)", null]}, "line": 9, "event": "step_line"}, {"ordered_globals": ["happy", "sing"], "stdout": "Happy Birthday to you!\nHappy Birthday to you!\nHappy Birthday dear Fred!\n", "func_name": "happy", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"P": "Fred"}, "is_highlighted": false, "is_parent": false, "func_name": "sing", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sing_f1", "ordered_varnames": ["P"]}, {"frame_id": 4, "encoded_locals": {}, "is_highlighted": true, "is_parent": false, "func_name": "happy", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "happy_f4", "ordered_varnames": []}], "globals": {"sing": ["REF", 2], "happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null], "2": ["FUNCTION", "sing(P)", null]}, "line": 2, "event": "call"}, {"ordered_globals": ["happy", "sing"], "stdout": "Happy Birthday to you!\nHappy Birthday to you!\nHappy Birthday dear Fred!\n", "func_name": "happy", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"P": "Fred"}, "is_highlighted": false, "is_parent": false, "func_name": "sing", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sing_f1", "ordered_varnames": ["P"]}, {"frame_id": 4, "encoded_locals": {}, "is_highlighted": true, "is_parent": false, "func_name": "happy", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "happy_f4", "ordered_varnames": []}], "globals": {"sing": ["REF", 2], "happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null], "2": ["FUNCTION", "sing(P)", null]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["happy", "sing"], "stdout": "Happy Birthday to you!\nHappy Birthday to you!\nHappy Birthday dear Fred!\nHappy Birthday to you!\n", "func_name": "happy", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"P": "Fred"}, "is_highlighted": false, "is_parent": false, "func_name": "sing", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sing_f1", "ordered_varnames": ["P"]}, {"frame_id": 4, "encoded_locals": {"__return__": null}, "is_highlighted": true, "is_parent": false, "func_name": "happy", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "happy_f4", "ordered_varnames": ["__return__"]}], "globals": {"sing": ["REF", 2], "happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null], "2": ["FUNCTION", "sing(P)", null]}, "line": 3, "event": "return"}, {"ordered_globals": ["happy", "sing"], "stdout": "Happy Birthday to you!\nHappy Birthday to you!\nHappy Birthday dear Fred!\nHappy Birthday to you!\n", "func_name": "sing", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"__return__": null, "P": "Fred"}, "is_highlighted": true, "is_parent": false, "func_name": "sing", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "sing_f1", "ordered_varnames": ["P", "__return__"]}], "globals": {"sing": ["REF", 2], "happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null], "2": ["FUNCTION", "sing(P)", null]}, "line": 9, "event": "return"}, {"ordered_globals": ["happy", "sing"], "stdout": "Happy Birthday to you!\nHappy Birthday to you!\nHappy Birthday dear Fred!\nHappy Birthday to you!\n", "func_name": "", "stack_to_render": [], "globals": {"sing": ["REF", 2], "happy": ["REF", 1]}, "heap": {"1": ["FUNCTION", "happy()", null], "2": ["FUNCTION", "sing(P)", null]}, "line": 12, "event": "return"}]};
+
+// 2. When the HTML document finishes loading, populate the three divs
+//    (listSumDiv, hanoiDiv, happyDiv) with the visualizations
+//    corresponding to the respective traces.
+$(document).ready(function() {
+
+
+  // see js/pytutor.js for the specs for ExecutionVisualizer
+  var listSumVisualizer = new ExecutionVisualizer('listSumDiv', listSumTrace,
+                                                  {embeddedMode: true, jumpToEnd: true, editCodeBaseURL: 'http://pythontutor.com/'});
+
+  var hanoiVisualizer   = new ExecutionVisualizer('hanoiDiv', hanoiTrace,
+                                                  {embeddedMode: true, startingInstruction: 45, editCodeBaseURL: 'http://pythontutor.com/'});
+
+  var happyVisualizer   = new ExecutionVisualizer('happyDiv', happyTrace,
+                                                  {embeddedMode: true, editCodeBaseURL: 'http://pythontutor.com/'});
+
+
+  // TODO: implement the div trick where the divs don't get shorter after they get taller ...
+
+  // redraw connector arrows on window resize
+  $(window).resize(function() {
+    listSumVisualizer.redrawConnectors();
+    hanoiVisualizer.redrawConnectors();
+    happyVisualizer.redrawConnectors();
+  });
+});
+
diff --git a/v3/embedding-examples.js b/v3/embedding-examples.js
deleted file mode 100644
index a80fb5fb4..000000000
--- a/v3/embedding-examples.js
+++ /dev/null
@@ -1,33 +0,0 @@
-// Traces generated by generate_json_trace.py
-
-var stuff = {"code": "# Philip's 10-minute intro to Python\n\n# numbers!\nage = 26\npi = 3.14159\n\n# strings!\ns = 'Rutherford Birchard Hayes'\ntokens = s.split()\nfirstName = tokens[0]\nmiddleName = tokens[1]\nlastName = tokens[2]\ns2 = firstName + ' ' + middleName + ' ' + lastName\n\n# 'if' statement - indentation matters!\nif (s == s2):\n    print 'yes!!!'\nelse:\n    print 'nooooooo'\n\n# list (mutable sequence)\nbeatles = ['John', 'Paul', 'George']\nbeatles.append('Ringo')\n\n# 'for' loop - indentation matters!\nfor b in beatles:\n    print 'Hello', b\n\n# tuple (immutable sequence)\nages = (18, 21, 28, 21, 22, 18, 19, 34, 9)\n\n# set (no order, no duplicates)\nuniqueAges = set(ages)\nuniqueAges.add(18) # already in set, no effect\nuniqueAges.remove(21)\n\n# no guaranteed order when iterating over a set\nfor thisAge in uniqueAges:\n    print thisAge\n\n# testing set membership\nif 18 in uniqueAges:\n    print 'There is an 18-year-old present!'\n\n# sorting\nbeatles.sort() # in-place\norderedUniqueAges = sorted(uniqueAges) # new list\n\n# dict - mapping unique keys to values\nnetWorth = {}\nnetWorth['Donald Trump'] = 3000000000\nnetWorth['Bill Gates'] = 58000000000\nnetWorth['Tom Cruise'] = 40000000\nnetWorth['Joe Postdoc'] = 20000\n\n# iterating over key-value pairs:\nfor (person, worth) in netWorth.iteritems():\n    if worth < 1000000:\n        print 'haha', person, 'is not a millionaire'\n\n# testing dict membership\nif 'Tom Cruise' in netWorth:\n    print 'show me the money!'\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 4, "event": "step_line"}, {"ordered_globals": ["age"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"age": 26}, "heap": {}, "line": 5, "event": "step_line"}, {"ordered_globals": ["age", "pi"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"age": 26, "pi": 3.14159}, "heap": {}, "line": 8, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"age": 26, "pi": 3.14159, "s": "Rutherford Birchard Hayes"}, "heap": {}, "line": 9, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"tokens": ["REF", 1], "age": 26, "pi": 3.14159, "s": "Rutherford Birchard Hayes"}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 10, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"tokens": ["REF", 1], "age": 26, "pi": 3.14159, "s": "Rutherford Birchard Hayes", "firstName": "Rutherford"}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 11, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"firstName": "Rutherford", "middleName": "Birchard", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 12, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 13, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 16, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 17, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2"], "stdout": "yes!!!\n", "func_name": "", "stack_to_render": [], "globals": {"firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"]}, "line": 22, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles"], "stdout": "yes!!!\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George"]}, "line": 23, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles"], "stdout": "yes!!!\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 26, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "John", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 27, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "John", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 26, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Paul", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 27, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\nHello Paul\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Paul", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 26, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\nHello Paul\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "George", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 27, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "George", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"]}, "line": 26, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "middleName": "Birchard", "lastName": "Hayes", "age": 26, "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": 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Paul\nHello George\nHello Ringo\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 21, 22, 28]}, "line": 35, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": 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"tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 9, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 39, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n", "func_name": "", 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Ringo\n34\n9\n18\n19\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 22, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 39, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", 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"thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 28, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "John", "Paul", "George", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 43, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], 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"ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 28, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28]}, "line": 47, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"beatles": ["REF", 2], "firstName": "Rutherford", "orderedUniqueAges": ["REF", 5], "middleName": "Birchard", "lastName": "Hayes", "age": 26, "uniqueAges": ["REF", 4], "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "s2": "Rutherford Birchard Hayes", "thisAge": 28, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34]}, "line": 50, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT"]}, "line": 51, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000]]}, "line": 52, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000]]}, "line": 53, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Tom Cruise", 40000000]]}, "line": 54, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 57, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Donald Trump", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 3000000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 58, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Donald Trump", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 3000000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 57, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Bill Gates", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 58000000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 58, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Bill Gates", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 58000000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 57, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Joe Postdoc", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 20000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 58, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Joe Postdoc", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 20000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 59, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\nhaha Joe Postdoc is not a millionaire\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Joe Postdoc", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 20000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 57, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\nhaha Joe Postdoc is not a millionaire\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Tom Cruise", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 40000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 58, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\nhaha Joe Postdoc is not a millionaire\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Tom Cruise", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 40000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 57, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\nhaha Joe Postdoc is not a millionaire\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Tom Cruise", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 40000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 62, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\nhaha Joe Postdoc is not a millionaire\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Tom Cruise", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 40000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 63, "event": "step_line"}, {"ordered_globals": ["age", "pi", "s", "tokens", "firstName", "middleName", "lastName", "s2", "beatles", "b", "ages", "uniqueAges", "thisAge", "orderedUniqueAges", "netWorth", "person", "worth"], "stdout": "yes!!!\nHello John\nHello Paul\nHello George\nHello Ringo\n34\n9\n18\n19\n22\n28\nThere is an 18-year-old present!\nhaha Joe Postdoc is not a millionaire\nshow me the money!\n", "func_name": "", "stack_to_render": [], "globals": {"netWorth": ["REF", 6], "beatles": ["REF", 2], "firstName": "Rutherford", "uniqueAges": ["REF", 4], "middleName": "Birchard", "s2": "Rutherford Birchard Hayes", "age": 26, "orderedUniqueAges": ["REF", 5], "ages": ["REF", 3], "tokens": ["REF", 1], "person": "Tom Cruise", "s": "Rutherford Birchard Hayes", "b": "Ringo", "lastName": "Hayes", "thisAge": 28, "pi": 3.14159, "worth": 40000000}, "heap": {"1": ["LIST", "Rutherford", "Birchard", "Hayes"], "2": ["LIST", "George", "John", "Paul", "Ringo"], "3": ["TUPLE", 18, 21, 28, 21, 22, 18, 19, 34, 9], "4": ["SET", 34, 9, 18, 19, 22, 28], "5": ["LIST", 9, 18, 19, 22, 28, 34], "6": ["DICT", ["Donald Trump", 3000000000], ["Bill Gates", 58000000000], ["Joe Postdoc", 20000], ["Tom Cruise", 40000000]]}, "line": 63, "event": "return"}]}
-
-var stuff = {"code": "# Object-oriented programming intro\n# Adapted from MIT 6.01 course notes (Section 3.5)\n# http://mit.edu/6.01/mercurial/spring10/www/handouts/readings.pdf\n\nclass Staff601:\n    course = '6.01'\n    building = 34\n    room = 501\n\n    def salutation(self):\n        return self.role + ' ' + self.name\n\npat = Staff601()\nprint pat.course\n\npat.name = 'Pat'\npat.age = 60\npat.role = 'Professor'\n\nprint pat.building\npat.building = 32\nprint pat.building\n\nprint pat.salutation()\nprint Staff601.salutation(pat)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 5, "event": "step_line"}, {"ordered_globals": [], "stdout": "", "func_name": "Staff601", "stack_to_render": [{"frame_id": 1, "encoded_locals": {}, "is_highlighted": true, "is_parent": false, "func_name": "Staff601", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "Staff601_f1", "ordered_varnames": []}], "globals": {}, "heap": {}, "line": 5, "event": "call"}, {"ordered_globals": [], "stdout": "", "func_name": "Staff601", "stack_to_render": [{"frame_id": 1, "encoded_locals": {}, "is_highlighted": true, "is_parent": false, "func_name": "Staff601", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "Staff601_f1", "ordered_varnames": []}], "globals": {}, "heap": {}, "line": 5, "event": "step_line"}, {"ordered_globals": [], "stdout": "", "func_name": "Staff601", "stack_to_render": [{"frame_id": 1, "encoded_locals": {}, "is_highlighted": true, "is_parent": false, "func_name": "Staff601", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "Staff601_f1", "ordered_varnames": []}], "globals": {}, "heap": {}, "line": 6, "event": "step_line"}, {"ordered_globals": [], "stdout": "", "func_name": "Staff601", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"course": "6.01"}, "is_highlighted": true, "is_parent": false, "func_name": "Staff601", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "Staff601_f1", "ordered_varnames": ["course"]}], "globals": {}, "heap": {}, "line": 7, "event": "step_line"}, {"ordered_globals": [], "stdout": "", "func_name": "Staff601", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01"}, "is_highlighted": true, "is_parent": false, "func_name": "Staff601", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "Staff601_f1", "ordered_varnames": ["building", "course"]}], "globals": {}, "heap": {}, "line": 8, "event": "step_line"}, {"ordered_globals": [], "stdout": "", "func_name": "Staff601", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01", "room": 501}, "is_highlighted": true, "is_parent": false, "func_name": "Staff601", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "Staff601_f1", "ordered_varnames": ["building", "course", "room"]}], "globals": {}, "heap": {}, "line": 10, "event": "step_line"}, {"ordered_globals": [], "stdout": "", "func_name": "Staff601", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01", "salutation": ["REF", 1], "room": 501, "__return__": ["REF", 2]}, "is_highlighted": true, "is_parent": true, "func_name": "Staff601", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "Staff601_f1_p", "ordered_varnames": ["building", "course", "room", "salutation", "__return__"]}], "globals": {}, "heap": {"1": ["FUNCTION", "salutation(self)", 1], "2": ["DICT", ["building", 34], ["room", 501], ["course", "6.01"], ["salutation", ["REF", 1]]]}, "line": 10, "event": "return"}, {"ordered_globals": ["Staff601"], "stdout": "", "func_name": "", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01", "salutation": ["REF", 1], "room": 501, "__return__": ["REF", 2]}, "is_highlighted": false, "is_parent": true, "func_name": "Staff601", "is_zombie": true, "parent_frame_id_list": [], "unique_hash": "Staff601_f1_p_z", "ordered_varnames": ["building", "course", "room", "salutation", "__return__"]}], "globals": {"Staff601": ["REF", 3]}, "heap": {"1": ["FUNCTION", "salutation(self)", 1], "2": ["DICT", ["building", 34], ["room", 501], ["course", "6.01"], ["salutation", ["REF", 1]], ["__doc__", null]], "3": ["CLASS", "Staff601", [], ["building", 34], ["course", "6.01"], ["room", 501], ["salutation", ["REF", 1]]]}, "line": 13, "event": "step_line"}, {"ordered_globals": ["Staff601", "pat"], "stdout": "", "func_name": "", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01", "salutation": ["REF", 1], "room": 501, "__return__": ["REF", 2]}, "is_highlighted": false, "is_parent": true, "func_name": "Staff601", "is_zombie": true, "parent_frame_id_list": [], "unique_hash": "Staff601_f1_p_z", "ordered_varnames": ["building", "course", "room", "salutation", "__return__"]}], "globals": {"Staff601": ["REF", 3], "pat": ["REF", 4]}, "heap": {"1": ["FUNCTION", "salutation(self)", 1], "2": ["DICT", ["building", 34], ["room", 501], ["course", "6.01"], ["salutation", ["REF", 1]], ["__doc__", null]], "3": ["CLASS", "Staff601", [], ["building", 34], ["course", "6.01"], ["room", 501], ["salutation", ["REF", 1]]], "4": ["INSTANCE", "Staff601"]}, "line": 14, "event": "step_line"}, {"ordered_globals": ["Staff601", "pat"], "stdout": "6.01\n", "func_name": "", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01", "salutation": ["REF", 1], "room": 501, "__return__": ["REF", 2]}, "is_highlighted": false, "is_parent": true, "func_name": "Staff601", "is_zombie": true, "parent_frame_id_list": [], "unique_hash": "Staff601_f1_p_z", "ordered_varnames": ["building", "course", "room", "salutation", "__return__"]}], "globals": {"Staff601": ["REF", 3], "pat": ["REF", 4]}, "heap": {"1": ["FUNCTION", "salutation(self)", 1], "2": ["DICT", ["building", 34], ["room", 501], ["course", "6.01"], ["salutation", ["REF", 1]], ["__doc__", null]], "3": ["CLASS", "Staff601", [], ["building", 34], ["course", "6.01"], ["room", 501], ["salutation", ["REF", 1]]], "4": ["INSTANCE", "Staff601"]}, "line": 16, "event": "step_line"}, {"ordered_globals": ["Staff601", "pat"], "stdout": "6.01\n", "func_name": "", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01", "salutation": ["REF", 1], "room": 501, "__return__": ["REF", 2]}, "is_highlighted": false, "is_parent": true, "func_name": "Staff601", "is_zombie": true, "parent_frame_id_list": [], "unique_hash": "Staff601_f1_p_z", "ordered_varnames": ["building", "course", "room", "salutation", "__return__"]}], "globals": {"Staff601": ["REF", 3], "pat": ["REF", 4]}, "heap": {"1": ["FUNCTION", "salutation(self)", 1], "2": ["DICT", ["building", 34], ["room", 501], ["course", "6.01"], ["salutation", ["REF", 1]], ["__doc__", null]], "3": ["CLASS", "Staff601", [], ["building", 34], ["course", "6.01"], ["room", 501], ["salutation", ["REF", 1]]], "4": 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["Staff601", "pat"], "stdout": "6.01\n", "func_name": "", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"building": 34, "course": "6.01", "salutation": ["REF", 1], "room": 501, "__return__": ["REF", 2]}, "is_highlighted": false, "is_parent": true, "func_name": "Staff601", "is_zombie": true, "parent_frame_id_list": [], "unique_hash": "Staff601_f1_p_z", "ordered_varnames": ["building", "course", "room", "salutation", "__return__"]}], "globals": {"Staff601": ["REF", 3], "pat": ["REF", 4]}, "heap": {"1": ["FUNCTION", "salutation(self)", 1], "2": ["DICT", ["building", 34], ["room", 501], ["course", "6.01"], ["salutation", ["REF", 1]], ["__doc__", null]], "3": ["CLASS", "Staff601", [], ["building", 34], ["course", "6.01"], ["room", 501], ["salutation", ["REF", 1]]], "4": ["INSTANCE", "Staff601", ["age", 60], ["name", "Pat"], ["role", "Professor"]]}, "line": 20, "event": "step_line"}, {"ordered_globals": ["Staff601", "pat"], "stdout": "6.01\n34\n", "func_name": "", "stack_to_render": 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-
-var hanoi = {"code": "# move a stack of n disks from stack a to stack b,\n# using tmp as a temporary stack\ndef TowerOfHanoi(n, a, b, tmp):\n    if n == 1:\n        b.append(a.pop())\n    else:\n        TowerOfHanoi(n-1, a, tmp, b)\n        b.append(a.pop())\n        TowerOfHanoi(n-1, tmp, b, a)\n        \nstack1 = [4,3,2,1]\nstack2 = []\nstack3 = []\n      \n# transfer stack1 to stack3 using Tower of Hanoi rules\nTowerOfHanoi(len(stack1), stack1, stack3, stack2)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 3, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"TowerOfHanoi": ["REF", 1]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null]}, "line": 11, "event": "step_line"}, {"ordered_globals": ["TowerOfHanoi", "stack1"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"TowerOfHanoi": ["REF", 1], 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"is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "__return__": null, "b": ["REF", 4], "n": 1}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 5, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "b": ["REF", 4], "n": 3}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i2", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "__return__": null, "b": ["REF", 4], "n": 2}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 9, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "b": ["REF", 4], "n": 4}, "is_highlighted": false, "parent_frame_id_list": []}, {"unique_hash": "TowerOfHanoi_i1", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 2], "a": ["REF", 3], "__return__": null, "b": ["REF", 4], "n": 3}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 9, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "TowerOfHanoi", "stack_to_render": [{"unique_hash": "TowerOfHanoi_i0", "func_name": "TowerOfHanoi", "is_zombie": false, "ordered_varnames": ["n", "a", "b", "tmp", "__return__"], "frame_id": null, "encoded_locals": {"tmp": ["REF", 3], "a": ["REF", 2], "__return__": null, "b": ["REF", 4], "n": 4}, "is_highlighted": true, "parent_frame_id_list": []}], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 9, "event": "return"}, {"ordered_globals": ["TowerOfHanoi", "stack1", "stack2", "stack3"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"stack3": ["REF", 4], "stack2": ["REF", 3], "TowerOfHanoi": ["REF", 1], "stack1": ["REF", 2]}, "heap": {"1": ["FUNCTION", "TowerOfHanoi(n, a, b, tmp)", null], "2": ["LIST"], "3": ["LIST"], "4": ["LIST", 4, 3, 2, 1]}, "line": 16, "event": "return"}]};
-
-
-var stuffViz = null;
-var aliasing5Viz = null;
-var hanoiViz = null;
-
-$(document).ready(function() {
-  stuffViz = new ExecutionVisualizer('stuffDiv', stuff, {embeddedMode: true, jumpToEnd: true, editCodeBaseURL: 'http://localhost:8080/'});
-  aliasing5Viz = new ExecutionVisualizer('aliasing5Div', aliasing5, {embeddedMode: true, jumpToEnd: true, editCodeBaseURL: 'http://localhost:8080/'});
-  hanoiViz = new ExecutionVisualizer('hanoiDiv', hanoi, {startingInstruction: 45, embeddedMode: true, editCodeBaseURL: 'http://localhost:8080/'});
-
-  // redraw connector arrows on window resize
-  $(window).resize(function() {
-    stuffViz.redrawConnectors();
-    aliasing5Viz.redrawConnectors();
-    hanoiViz.redrawConnectors();
-  });
-
-
-});
-
diff --git a/v3/generate_json_trace.py b/v3/generate_json_trace.py
index 809aa3807..117eade81 100644
--- a/v3/generate_json_trace.py
+++ b/v3/generate_json_trace.py
@@ -1,5 +1,7 @@
 # Generates a JSON trace that is compatible with the js/pytutor.js frontend
 
+import optparse
+
 CUMULATIVE_MODE = False
 
 COMPACT = False
@@ -26,6 +28,20 @@ def json_finalizer(input_code, output_trace):
   print(json_output)
 
 
-for f in sys.argv[1:]:
-  pg_logger.exec_script_str(open(f).read(), CUMULATIVE_MODE, json_finalizer)
+def js_var_finalizer(input_code, output_trace):
+  global JS_VARNAME
+  ret = dict(code=input_code, trace=output_trace)
+  json_output = json.dumps(ret, indent=None)
+  print("var %s = %s;" % (JS_VARNAME, json_output))
+
 
+parser = optparse.OptionParser()
+parser.add_option("--create_jsvar", dest="js_varname",
+                  help="Create a JavaScript variable out of the trace")
+(options, args) = parser.parse_args()
+
+if options.js_varname:
+  JS_VARNAME = options.js_varname
+  pg_logger.exec_script_str(open(args[0]).read(), CUMULATIVE_MODE, js_var_finalizer)
+else:
+  pg_logger.exec_script_str(open(args[0]).read(), CUMULATIVE_MODE, json_finalizer)
diff --git a/v3/tests/backend-tests/list_sum.golden b/v3/tests/backend-tests/list_sum.golden
new file mode 100644
index 000000000..332b07b21
--- /dev/null
+++ b/v3/tests/backend-tests/list_sum.golden
@@ -0,0 +1,2125 @@
+{
+  "code": "def listSum(numbers):\n  if not numbers:\n    return 0\n  else:\n    (f, rest) = numbers\n    return f + listSum(rest)\n\nmyList = (1, (2, (3, None)))\ntotal = listSum(myList)\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "listSum"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "listSum": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "listSum(numbers)", 
+          null
+        ]
+      }, 
+      "line": 8, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "listSum", 
+        "myList"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "myList": [
+          "REF", 
+          2
+        ], 
+        "listSum": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "listSum(numbers)", 
+          null
+        ], 
+        "2": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            4
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          3, 
+          null
+        ]
+      }, 
+      "line": 9, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "listSum", 
+        "myList"
+      ], 
+      "stdout": "", 
+      "func_name": "listSum", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "numbers": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f1", 
+          "ordered_varnames": [
+            "numbers"
+          ]
+        }
+      ], 
+      "globals": {
+        "myList": [
+          "REF", 
+          2
+        ], 
+        "listSum": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "listSum(numbers)", 
+          null
+        ], 
+        "2": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            4
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          3, 
+          null
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "listSum", 
+        "myList"
+      ], 
+      "stdout": "", 
+      "func_name": "listSum", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "numbers": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f1", 
+          "ordered_varnames": [
+            "numbers"
+          ]
+        }
+      ], 
+      "globals": {
+        "myList": [
+          "REF", 
+          2
+        ], 
+        "listSum": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "listSum(numbers)", 
+          null
+        ], 
+        "2": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            4
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          3, 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "listSum", 
+        "myList"
+      ], 
+      "stdout": "", 
+      "func_name": "listSum", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "numbers": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f1", 
+          "ordered_varnames": [
+            "numbers"
+          ]
+        }
+      ], 
+      "globals": {
+        "myList": [
+          "REF", 
+          2
+        ], 
+        "listSum": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "listSum(numbers)", 
+          null
+        ], 
+        "2": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            4
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          3, 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "listSum", 
+        "myList"
+      ], 
+      "stdout": "", 
+      "func_name": "listSum", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "numbers": [
+              "REF", 
+              2
+            ], 
+            "rest": [
+              "REF", 
+              3
+            ], 
+            "f": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f1", 
+          "ordered_varnames": [
+            "numbers", 
+            "f", 
+            "rest"
+          ]
+        }
+      ], 
+      "globals": {
+        "myList": [
+          "REF", 
+          2
+        ], 
+        "listSum": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "listSum(numbers)", 
+          null
+        ], 
+        "2": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            4
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          3, 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "listSum", 
+        "myList"
+      ], 
+      "stdout": "", 
+      "func_name": "listSum", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "numbers": [
+              "REF", 
+              2
+            ], 
+            "rest": [
+              "REF", 
+              3
+            ], 
+            "f": 1
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f1", 
+          "ordered_varnames": [
+            "numbers", 
+            "f", 
+            "rest"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "numbers": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f2", 
+          "ordered_varnames": [
+            "numbers"
+          ]
+        }
+      ], 
+      "globals": {
+        "myList": [
+          "REF", 
+          2
+        ], 
+        "listSum": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "listSum(numbers)", 
+          null
+        ], 
+        "2": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            4
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          3, 
+          null
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "listSum", 
+        "myList"
+      ], 
+      "stdout": "", 
+      "func_name": "listSum", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "numbers": [
+              "REF", 
+              2
+            ], 
+            "rest": [
+              "REF", 
+              3
+            ], 
+            "f": 1
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f1", 
+          "ordered_varnames": [
+            "numbers", 
+            "f", 
+            "rest"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "numbers": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f2", 
+          "ordered_varnames": [
+            "numbers"
+          ]
+        }
+      ], 
+      "globals": {
+        "myList": [
+          "REF", 
+          2
+        ], 
+        "listSum": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "listSum(numbers)", 
+          null
+        ], 
+        "2": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            4
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          3, 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "listSum", 
+        "myList"
+      ], 
+      "stdout": "", 
+      "func_name": "listSum", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "numbers": [
+              "REF", 
+              2
+            ], 
+            "rest": [
+              "REF", 
+              3
+            ], 
+            "f": 1
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f1", 
+          "ordered_varnames": [
+            "numbers", 
+            "f", 
+            "rest"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "numbers": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f2", 
+          "ordered_varnames": [
+            "numbers"
+          ]
+        }
+      ], 
+      "globals": {
+        "myList": [
+          "REF", 
+          2
+        ], 
+        "listSum": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "listSum(numbers)", 
+          null
+        ], 
+        "2": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            4
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          3, 
+          null
+        ]
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diff --git a/v3/tests/backend-tests/list_sum.golden_py3 b/v3/tests/backend-tests/list_sum.golden_py3
new file mode 100644
index 000000000..332b07b21
--- /dev/null
+++ b/v3/tests/backend-tests/list_sum.golden_py3
@@ -0,0 +1,2125 @@
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+            3
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            4
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          3, 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "listSum", 
+        "myList"
+      ], 
+      "stdout": "", 
+      "func_name": "listSum", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "numbers": [
+              "REF", 
+              2
+            ], 
+            "rest": [
+              "REF", 
+              3
+            ], 
+            "f": 1
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f1", 
+          "ordered_varnames": [
+            "numbers", 
+            "f", 
+            "rest"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "numbers": [
+              "REF", 
+              3
+            ], 
+            "rest": [
+              "REF", 
+              4
+            ], 
+            "f": 2
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f2", 
+          "ordered_varnames": [
+            "numbers", 
+            "f", 
+            "rest"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "numbers": [
+              "REF", 
+              4
+            ], 
+            "rest": null, 
+            "f": 3
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f3", 
+          "ordered_varnames": [
+            "numbers", 
+            "f", 
+            "rest"
+          ]
+        }, 
+        {
+          "frame_id": 4, 
+          "encoded_locals": {
+            "__return__": 0, 
+            "numbers": null
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f4", 
+          "ordered_varnames": [
+            "numbers", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "myList": [
+          "REF", 
+          2
+        ], 
+        "listSum": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "listSum(numbers)", 
+          null
+        ], 
+        "2": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            4
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          3, 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "listSum", 
+        "myList"
+      ], 
+      "stdout": "", 
+      "func_name": "listSum", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "numbers": [
+              "REF", 
+              2
+            ], 
+            "rest": [
+              "REF", 
+              3
+            ], 
+            "f": 1
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f1", 
+          "ordered_varnames": [
+            "numbers", 
+            "f", 
+            "rest"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "numbers": [
+              "REF", 
+              3
+            ], 
+            "rest": [
+              "REF", 
+              4
+            ], 
+            "f": 2
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f2", 
+          "ordered_varnames": [
+            "numbers", 
+            "f", 
+            "rest"
+          ]
+        }, 
+        {
+          "frame_id": 3, 
+          "encoded_locals": {
+            "__return__": 3, 
+            "numbers": [
+              "REF", 
+              4
+            ], 
+            "rest": null, 
+            "f": 3
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f3", 
+          "ordered_varnames": [
+            "numbers", 
+            "f", 
+            "rest", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "myList": [
+          "REF", 
+          2
+        ], 
+        "listSum": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "listSum(numbers)", 
+          null
+        ], 
+        "2": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            4
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          3, 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "listSum", 
+        "myList"
+      ], 
+      "stdout": "", 
+      "func_name": "listSum", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "numbers": [
+              "REF", 
+              2
+            ], 
+            "rest": [
+              "REF", 
+              3
+            ], 
+            "f": 1
+          }, 
+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f1", 
+          "ordered_varnames": [
+            "numbers", 
+            "f", 
+            "rest"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "__return__": 5, 
+            "numbers": [
+              "REF", 
+              3
+            ], 
+            "rest": [
+              "REF", 
+              4
+            ], 
+            "f": 2
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f2", 
+          "ordered_varnames": [
+            "numbers", 
+            "f", 
+            "rest", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "myList": [
+          "REF", 
+          2
+        ], 
+        "listSum": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "listSum(numbers)", 
+          null
+        ], 
+        "2": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            4
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          3, 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "listSum", 
+        "myList"
+      ], 
+      "stdout": "", 
+      "func_name": "listSum", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "__return__": 6, 
+            "numbers": [
+              "REF", 
+              2
+            ], 
+            "rest": [
+              "REF", 
+              3
+            ], 
+            "f": 1
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "listSum", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "listSum_f1", 
+          "ordered_varnames": [
+            "numbers", 
+            "f", 
+            "rest", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "myList": [
+          "REF", 
+          2
+        ], 
+        "listSum": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "listSum(numbers)", 
+          null
+        ], 
+        "2": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            4
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          3, 
+          null
+        ]
+      }, 
+      "line": 6, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "listSum", 
+        "myList", 
+        "total"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "total": 6, 
+        "myList": [
+          "REF", 
+          2
+        ], 
+        "listSum": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "listSum(numbers)", 
+          null
+        ], 
+        "2": [
+          "TUPLE", 
+          1, 
+          [
+            "REF", 
+            3
+          ]
+        ], 
+        "3": [
+          "TUPLE", 
+          2, 
+          [
+            "REF", 
+            4
+          ]
+        ], 
+        "4": [
+          "TUPLE", 
+          3, 
+          null
+        ]
+      }, 
+      "line": 9, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/list_sum.txt b/v3/tests/backend-tests/list_sum.txt
new file mode 100644
index 000000000..ce2556a0d
--- /dev/null
+++ b/v3/tests/backend-tests/list_sum.txt
@@ -0,0 +1,9 @@
+def listSum(numbers):
+  if not numbers:
+    return 0
+  else:
+    (f, rest) = numbers
+    return f + listSum(rest)
+
+myList = (1, (2, (3, None)))
+total = listSum(myList)

From 527b11aa21d62ebdb743a7ba0321d75051010000 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 1 Oct 2012 14:10:17 -0700
Subject: [PATCH 443/502] checked in embedding demo

---
 v3/embedding-demo.html | 12 +++------
 v3/embedding-demo.js   | 58 +++++++++++++++++++++++++++++++++++++-----
 2 files changed, 54 insertions(+), 16 deletions(-)

diff --git a/v3/embedding-demo.html b/v3/embedding-demo.html
index ac025e96b..bb89143d5 100644
--- a/v3/embedding-demo.html
+++ b/v3/embedding-demo.html
@@ -18,10 +18,8 @@
 
 
 
-
 
 
@@ -29,11 +27,7 @@
 
 
 
-
+  
 
   
    Recursive list sum (from pythontutor.com home page):
    
 
diff --git a/v3/embedding-demo.js b/v3/embedding-demo.js
index 861017e82..9af98dbc6 100644
--- a/v3/embedding-demo.js
+++ b/v3/embedding-demo.js
@@ -21,25 +21,69 @@ var happyTrace = {"code": "# From \"Teaching with Python\" by John Zelle\ndef ha
 //    corresponding to the respective traces.
 $(document).ready(function() {
 
+  // 3. Create a new ExecutionVisualizer object for each visualization.
+  //    (See js/pytutor.js for the full specs of ExecutionVisualizer.)
+  //
+  //    The basic idea is that the parent div name is passed as the first argument,
+  //    and the trace object is passed as the second argument.
+  //
+  //    The third argument contains optional parameters.
 
-  // see js/pytutor.js for the specs for ExecutionVisualizer
+  // Note that "embeddedMode: true" makes the visualizer appear more compact on-screen.
+  // editCodeBaseURL is the base URL to prepend onto the 'Edit code' link.
+
+  // Render listSumTrace inside of listSumDiv
   var listSumVisualizer = new ExecutionVisualizer('listSumDiv', listSumTrace,
-                                                  {embeddedMode: true, jumpToEnd: true, editCodeBaseURL: 'http://pythontutor.com/'});
+                                                  {embeddedMode: true,
+                                                   editCodeBaseURL: 'http://pythontutor.com/visualize.html'});
 
+  // The "startingInstruction: 15" optional parameter means to jump to step 15
+  // in the visualization when it loads. (The HTML webpage will actually display
+  // "Step 16 of 64" since indices are zero-indexed.)
   var hanoiVisualizer   = new ExecutionVisualizer('hanoiDiv', hanoiTrace,
-                                                  {embeddedMode: true, startingInstruction: 45, editCodeBaseURL: 'http://pythontutor.com/'});
+                                                  {embeddedMode: true,
+                                                   startingInstruction: 15,
+                                                   editCodeBaseURL: 'http://pythontutor.com/visualize.html'});
 
+  // "embeddedMode: false" displays the full visualizer widget with the "Program Output" pane
+  // "jumpToEnd: true" means to jump to the end of execution upon loading.
   var happyVisualizer   = new ExecutionVisualizer('happyDiv', happyTrace,
-                                                  {embeddedMode: true, editCodeBaseURL: 'http://pythontutor.com/'});
+                                                  {embeddedMode: false,
+                                                   jumpToEnd: true,
+                                                   editCodeBaseURL: 'http://pythontutor.com/visualize.html'});
 
 
-  // TODO: implement the div trick where the divs don't get shorter after they get taller ...
+  // The redrawConnectors() method needs to be called whenever
+  // HTML elements move around on-screen. This is because the SVG
+  // arrows rendered by jsPlumb don't automatically get redrawn
+  // in their new positions unless redrawConnectors() is called.
 
-  // redraw connector arrows on window resize
+  // Call redrawConnectors() whenever the window is resized,
+  // since HTML elements might have moved during a resize.
   $(window).resize(function() {
     listSumVisualizer.redrawConnectors();
     hanoiVisualizer.redrawConnectors();
     happyVisualizer.redrawConnectors();
   });
-});
 
+
+  // A more subtle point is that when some div in your HTML webpage
+  // (such as a visualizer div) expands in height, it will "push down"
+  // all divs below it, but the SVG arrows rendered by jsPlumb
+  // WILL NOT MOVE. Thus, they will be in the incorrect location,
+  // unless you call redrawConnectors(). Here is one jQuery plugin
+  // that you can use to detect div height changes:
+  //
+  // http://benalman.com/projects/jquery-resize-plugin/
+  //
+  // As a concrete example, drag around the execution slider in
+  // "Towers of Hanoi" and notice how the arrows in "Happy Birthday"
+  // end up not properly aligned with the other elements.
+  //
+  // A related trick you can implement is to make a div never shrink
+  // in height once it's grown; that way, you can avoid lots of jarring
+  // jumps and redraws.
+  //
+  // Please email me if you want me to add more official support
+  // for this behavior.
+});

From c6422ebfb89d27c68dee583f34b35c65bea0a12d Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 1 Oct 2012 14:12:37 -0700
Subject: [PATCH 444/502] Update v3/docs/embedding-HOWTO.md

---
 v3/docs/embedding-HOWTO.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/v3/docs/embedding-HOWTO.md b/v3/docs/embedding-HOWTO.md
index f11975367..a87404279 100644
--- a/v3/docs/embedding-HOWTO.md
+++ b/v3/docs/embedding-HOWTO.md
@@ -37,8 +37,8 @@ brought to the [code editor page](http://pythontutor.com/visualize.html).
 ## The Nitty-Gritty
 
 Let's attempt to go [literate programming](http://en.wikipedia.org/wiki/Literate_programming) style now ... load up
-[v3/embedding-demo.html](https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/embedding-demo.html) in
-your browser to see a demo. And then view its source code and follow the instructions there, which should
+[embedding-demo.html](http://pythontutor.com/embedding-demo.html) in
+your browser to see a demo. And then view its [source code](https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/embedding-demo.html) and follow the instructions there, which should
 lead you to [v3/embedding-demo.js](https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/embedding-demo.js).
 
 Everything you need to know should be in the demo code!

From c14626d7be194e03907cd3e75017b244c8732f36 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 1 Oct 2012 14:17:32 -0700
Subject: [PATCH 445/502] Update v3/docs/embedding-HOWTO.md

---
 v3/docs/embedding-HOWTO.md | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/v3/docs/embedding-HOWTO.md b/v3/docs/embedding-HOWTO.md
index a87404279..3e481e9bd 100644
--- a/v3/docs/embedding-HOWTO.md
+++ b/v3/docs/embedding-HOWTO.md
@@ -29,7 +29,6 @@ string representing a JavaScript (JSON) object.
 
 Note that the embedded visualization is **read-only** -- that is, the user can interact with the visualization
 by stepping forward and backward, but they cannot edit the code.
-
 If the user wants to click the 'Edit code' button to edit the code, then they are
 brought to the [code editor page](http://pythontutor.com/visualize.html).
 
@@ -38,7 +37,7 @@ brought to the [code editor page](http://pythontutor.com/visualize.html).
 
 Let's attempt to go [literate programming](http://en.wikipedia.org/wiki/Literate_programming) style now ... load up
 [embedding-demo.html](http://pythontutor.com/embedding-demo.html) in
-your browser to see a demo. And then view its [source code](https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/embedding-demo.html) and follow the instructions there, which should
-lead you to [v3/embedding-demo.js](https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/embedding-demo.js).
+your browser to see a demo. And then view its [source code](https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/embedding-demo.html) and follow the instructions there,
+which should then lead you to `v3/embedding-demo.js`.
 
 Everything you need to know should be in the demo code!

From 4d2411c1a5d6089ee46d500826eff031564bcb2c Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 1 Oct 2012 14:24:26 -0700
Subject: [PATCH 446/502] Update v3/docs/embedding-HOWTO.md

---
 v3/docs/embedding-HOWTO.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/v3/docs/embedding-HOWTO.md b/v3/docs/embedding-HOWTO.md
index 3e481e9bd..0cbb8bb56 100644
--- a/v3/docs/embedding-HOWTO.md
+++ b/v3/docs/embedding-HOWTO.md
@@ -32,6 +32,11 @@ by stepping forward and backward, but they cannot edit the code.
 If the user wants to click the 'Edit code' button to edit the code, then they are
 brought to the [code editor page](http://pythontutor.com/visualize.html).
 
+Also, note that the visualization is run client-side; thus, after the user loads the webpage (from the Internet
+or, say, a USB drive), they can play with the visualization without an Internet connection.
+
+Finally, multiple visualizations can be embedded in a single HTML webpage, although you need to be careful
+to redraw the SVG arrows when page elements are resized or moved.
 
 ## The Nitty-Gritty
 

From 7a4722dd688c0ea33738579da56c3b1957c6d647 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 1 Oct 2012 14:36:05 -0700
Subject: [PATCH 447/502] added another problematic test case

---
 v3/tests/backend-tests/john-triple-nesting.txt | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 v3/tests/backend-tests/john-triple-nesting.txt

diff --git a/v3/tests/backend-tests/john-triple-nesting.txt b/v3/tests/backend-tests/john-triple-nesting.txt
new file mode 100644
index 000000000..60a949231
--- /dev/null
+++ b/v3/tests/backend-tests/john-triple-nesting.txt
@@ -0,0 +1,13 @@
+# test in Python 3
+def f(t):
+    def g(t):
+        def h():
+            nonlocal t
+            t += 1
+        return h, lambda: t
+    h, gt = g(0)
+    return h, gt, lambda: t
+h, gt, ft = f(0)
+ft(), gt()
+h()
+ft(), gt()

From 998b5e129a6bacd7b2768baface5a9d5442d4d9c Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 1 Oct 2012 22:59:02 -0700
Subject: [PATCH 448/502] RECURSIVELY dive inside of objects reachable from top
 of stack in order to find lambdas and other nested functions ... subtle!

---
 v3/pg_encoder.py                              |   38 +-
 v3/pg_logger.py                               |   57 +-
 .../john-lambda-lambda-mini.golden            |  817 ++++
 .../john-lambda-lambda-mini.golden_py3        |  817 ++++
 .../backend-tests/john-lambda-lambda-mini.txt |    5 +
 .../backend-tests/john-lambda-lambda.golden   |  472 +++
 .../john-lambda-lambda.golden_py3             |  472 +++
 .../backend-tests/john-triple-nesting.golden  |   11 +
 .../john-triple-nesting.golden_py3            | 3726 +++++++++++++++++
 9 files changed, 6393 insertions(+), 22 deletions(-)
 create mode 100644 v3/tests/backend-tests/john-lambda-lambda-mini.golden
 create mode 100644 v3/tests/backend-tests/john-lambda-lambda-mini.golden_py3
 create mode 100644 v3/tests/backend-tests/john-lambda-lambda-mini.txt
 create mode 100644 v3/tests/backend-tests/john-lambda-lambda.golden
 create mode 100644 v3/tests/backend-tests/john-lambda-lambda.golden_py3
 create mode 100644 v3/tests/backend-tests/john-triple-nesting.golden
 create mode 100644 v3/tests/backend-tests/john-triple-nesting.golden_py3

diff --git a/v3/pg_encoder.py b/v3/pg_encoder.py
index 03ac0f67c..c57c20f08 100644
--- a/v3/pg_encoder.py
+++ b/v3/pg_encoder.py
@@ -68,6 +68,23 @@
   long = None # Avoid NameError when evaluating "long"
 
 
+def is_class(dat):
+  """Return whether dat is a class."""
+  if is_python3:
+    return isinstance(dat, type)
+  else:
+    return type(dat) in (types.ClassType, types.TypeType)
+
+
+def is_instance(dat):
+  """Return whether dat is an instance of a class."""
+  if is_python3:
+    return isinstance(type(dat), type) and not isinstance(dat, type)
+  else:
+    # ugh, classRE match is a bit of a hack :(
+    return type(dat) == types.InstanceType or classRE.match(str(type(dat)))
+
+
 def get_name(obj):
   """Return the name of an object."""
   return obj.__name__ if hasattr(obj, '__name__') else get_name(type(obj))
@@ -182,7 +199,7 @@ def encode(self, dat):
       elif typ is types.BuiltinFunctionType:
         pretty_name = get_name(dat) + '(...)'
         new_obj.extend(['FUNCTION', pretty_name, None])
-      elif self.is_class(dat) or self.is_instance(dat):
+      elif is_class(dat) or is_instance(dat):
         self.encode_class_or_instance(dat, new_obj)
       elif typ is types.ModuleType:
         new_obj.extend(['module', dat.__name__])
@@ -199,26 +216,9 @@ def encode(self, dat):
       return ret
 
 
-  def is_class(self, dat):
-    """Return whether dat is a class."""
-    if is_python3:
-      return isinstance(dat, type)
-    else:
-      return type(dat) in (types.ClassType, types.TypeType)
-
-
-  def is_instance(self, dat):
-    """Return whether dat is an instance of a class."""
-    if is_python3:
-      return isinstance(type(dat), type) and not isinstance(dat, type)
-    else:
-      # ugh, classRE match is a bit of a hack :(
-      return type(dat) == types.InstanceType or classRE.match(str(type(dat)))
-
-
   def encode_class_or_instance(self, dat, new_obj):
     """Encode dat as a class or instance."""
-    if self.is_instance(dat):
+    if is_instance(dat):
       class_name = get_name(dat.__class__)
       new_obj.extend(['INSTANCE', class_name])
       # don't traverse inside modules, or else risk EXPLODING the visualization
diff --git a/v3/pg_logger.py b/v3/pg_logger.py
index 2d2aae4c4..90754e5b8 100644
--- a/v3/pg_logger.py
+++ b/v3/pg_logger.py
@@ -134,6 +134,58 @@ def filter_var_dict(d):
   return ret
 
 
+# yield all function objects locally-reachable from frame,
+# making sure to traverse inside all compound objects ...
+def visit_all_locally_reachable_function_objs(frame):
+  for (k, v) in get_user_locals(frame).items():
+    for e in visit_function_obj(v, set()):
+      if e: # only non-null if it's a function object
+        assert type(e) in (types.FunctionType, types.MethodType)
+        yield e
+
+
+# TODO: this might be slow if we're traversing inside lots of objects:
+def visit_function_obj(v, ids_seen_set):
+  v_id = id(v)
+
+  # to prevent infinite loop
+  if v_id in ids_seen_set:
+    yield None
+  else:
+    ids_seen_set.add(v_id)
+
+    typ = type(v)
+    
+    # simple base case
+    if typ in (types.FunctionType, types.MethodType):
+      yield v
+
+    # recursive cases
+    elif typ in (list, tuple, set):
+      for child in v:
+        for child_res in visit_function_obj(child, ids_seen_set):
+          yield child_res
+
+    elif typ == dict or pg_encoder.is_class(v) or pg_encoder.is_instance(v):
+      contents_dict = None
+
+      if typ == dict:
+        contents_dict = v
+      # warning: some classes or instances don't have __dict__ attributes
+      elif hasattr(v, '__dict__'):
+        contents_dict = v.__dict__
+
+      if contents_dict:
+        for (key_child, val_child) in contents_dict.items():
+          for key_child_res in visit_function_obj(key_child, ids_seen_set):
+            yield key_child_res
+          for val_child_res in visit_function_obj(val_child, ids_seen_set):
+            yield val_child_res
+
+    # degenerate base case
+    yield None
+
+
 class PGLogger(bdb.Bdb):
 
     def __init__(self, cumulative_mode, finalizer_func):
@@ -474,9 +526,8 @@ def create_encoded_stack_entry(cur_frame):
         # look for whether a nested function has been defined during
         # this particular call:
         if i > 1: # i == 1 implies that there's only a global scope visible
-          for (k, v) in get_user_locals(top_frame).items():
-            if (type(v) in (types.FunctionType, types.MethodType) and \
-                v not in self.closures and \
+          for v in visit_all_locally_reachable_function_objs(top_frame):
+            if (v not in self.closures and \
                 v not in self.globally_defined_funcs):
 
               # Look for the presence of the code object (v.func_code
diff --git a/v3/tests/backend-tests/john-lambda-lambda-mini.golden b/v3/tests/backend-tests/john-lambda-lambda-mini.golden
new file mode 100644
index 000000000..fa12e342a
--- /dev/null
+++ b/v3/tests/backend-tests/john-lambda-lambda-mini.golden
@@ -0,0 +1,817 @@
+{
+  "code": "def a(b):\n    a = b(3)\n    a(100)\n\na(lambda a: (lambda b: a))\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 1, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "a"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "a(b)", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "a"
+      ], 
+      "stdout": "", 
+      "func_name": "a", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "b": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "a", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "a_f1", 
+          "ordered_varnames": [
+            "b"
+          ]
+        }
+      ], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ]
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+          null
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+          null
+        ]
+      }, 
+      "line": 1, 
+      "event": "call"
+    }, 
+    {
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+        "a"
+      ], 
+      "stdout": "", 
+      "func_name": "a", 
+      "stack_to_render": [
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+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2", 
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+        ]
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+}
diff --git a/v3/tests/backend-tests/john-lambda-lambda-mini.golden_py3 b/v3/tests/backend-tests/john-lambda-lambda-mini.golden_py3
new file mode 100644
index 000000000..fa12e342a
--- /dev/null
+++ b/v3/tests/backend-tests/john-lambda-lambda-mini.golden_py3
@@ -0,0 +1,817 @@
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diff --git a/v3/tests/backend-tests/john-lambda-lambda-mini.txt b/v3/tests/backend-tests/john-lambda-lambda-mini.txt
new file mode 100644
index 000000000..bd8f4edc3
--- /dev/null
+++ b/v3/tests/backend-tests/john-lambda-lambda-mini.txt
@@ -0,0 +1,5 @@
+def a(b):
+    a = b(3)
+    a(100)
+
+a(lambda a: (lambda b: a))
diff --git a/v3/tests/backend-tests/john-lambda-lambda.golden b/v3/tests/backend-tests/john-lambda-lambda.golden
new file mode 100644
index 000000000..8cfb591a5
--- /dev/null
+++ b/v3/tests/backend-tests/john-lambda-lambda.golden
@@ -0,0 +1,472 @@
+{
+  "code": "# another gem from john denero ...\ndef a(b):\n    a, b = b(3)\n\na(lambda a: (lambda b: a, a))\n", 
+  "trace": [
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+      "event": "return"
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+    {
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+      "stdout": "", 
+      "func_name": "a", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
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+          ]
+        }, 
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+          "encoded_locals": {
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+              3
+            ]
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+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2_p_z", 
+          "ordered_varnames": [
+            "a", 
+            "__return__"
+          ]
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+          "(b)", 
+          2
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+      "line": 3, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "a"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "a": 3, 
+            "__return__": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2_p_z", 
+          "ordered_varnames": [
+            "a", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "a(b)", 
+          null
+        ], 
+        "3": [
+          "TUPLE", 
+          [
+            "REF", 
+            4
+          ], 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
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+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/john-lambda-lambda.golden_py3 b/v3/tests/backend-tests/john-lambda-lambda.golden_py3
new file mode 100644
index 000000000..8cfb591a5
--- /dev/null
+++ b/v3/tests/backend-tests/john-lambda-lambda.golden_py3
@@ -0,0 +1,472 @@
+{
+  "code": "# another gem from john denero ...\ndef a(b):\n    a, b = b(3)\n\na(lambda a: (lambda b: a, a))\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "a"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ]
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+          "a(b)", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "a"
+      ], 
+      "stdout": "", 
+      "func_name": "a", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "b": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "a", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "a_f1", 
+          "ordered_varnames": [
+            "b"
+          ]
+        }
+      ], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
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+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(a)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "a"
+      ], 
+      "stdout": "", 
+      "func_name": "a", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "b": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "a", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "a_f1", 
+          "ordered_varnames": [
+            "b"
+          ]
+        }
+      ], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "a(b)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(a)", 
+          null
+        ]
+      }, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "a"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "b": [
+              "REF", 
+              2
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+          }, 
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+          "is_parent": false, 
+          "func_name": "a", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "a_f1", 
+          "ordered_varnames": [
+            "b"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "a": 3
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2", 
+          "ordered_varnames": [
+            "a"
+          ]
+        }
+      ], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "a(b)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(a)", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "a"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "b": [
+              "REF", 
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+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "a_f1", 
+          "ordered_varnames": [
+            "b"
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+        }, 
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+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2", 
+          "ordered_varnames": [
+            "a"
+          ]
+        }
+      ], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "a(b)", 
+          null
+        ], 
+        "2": [
+          "FUNCTION", 
+          "(a)", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "a"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "b": [
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+            ]
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+          "is_highlighted": false, 
+          "is_parent": false, 
+          "func_name": "a", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "a_f1", 
+          "ordered_varnames": [
+            "b"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "a": 3, 
+            "__return__": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": true, 
+          "is_parent": true, 
+          "func_name": "", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2_p", 
+          "ordered_varnames": [
+            "a", 
+            "__return__"
+          ]
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+        "a": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
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+        "2": [
+          "FUNCTION", 
+          "(a)", 
+          null
+        ], 
+        "3": [
+          "TUPLE", 
+          [
+            "REF", 
+            4
+          ], 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "(b)", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "a"
+      ], 
+      "stdout": "", 
+      "func_name": "a", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "a": [
+              "REF", 
+              4
+            ], 
+            "__return__": null, 
+            "b": 3
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "a", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "a_f1", 
+          "ordered_varnames": [
+            "b", 
+            "a", 
+            "__return__"
+          ]
+        }, 
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "a": 3, 
+            "__return__": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2_p_z", 
+          "ordered_varnames": [
+            "a", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "a(b)", 
+          null
+        ], 
+        "3": [
+          "TUPLE", 
+          [
+            "REF", 
+            4
+          ], 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "(b)", 
+          2
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }, 
+    {
+      "ordered_globals": [
+        "a"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [
+        {
+          "frame_id": 2, 
+          "encoded_locals": {
+            "a": 3, 
+            "__return__": [
+              "REF", 
+              3
+            ]
+          }, 
+          "is_highlighted": false, 
+          "is_parent": true, 
+          "func_name": "", 
+          "is_zombie": true, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "_f2_p_z", 
+          "ordered_varnames": [
+            "a", 
+            "__return__"
+          ]
+        }
+      ], 
+      "globals": {
+        "a": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "a(b)", 
+          null
+        ], 
+        "3": [
+          "TUPLE", 
+          [
+            "REF", 
+            4
+          ], 
+          3
+        ], 
+        "4": [
+          "FUNCTION", 
+          "(b)", 
+          null
+        ]
+      }, 
+      "line": 5, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/john-triple-nesting.golden b/v3/tests/backend-tests/john-triple-nesting.golden
new file mode 100644
index 000000000..61283f9c5
--- /dev/null
+++ b/v3/tests/backend-tests/john-triple-nesting.golden
@@ -0,0 +1,11 @@
+{
+  "code": "# test in Python 3\ndef f(t):\n    def g(t):\n        def h():\n            nonlocal t\n            t += 1\n        return h, lambda: t\n    h, gt = g(0)\n    return h, gt, lambda: t\nh, gt, ft = f(0)\nft(), gt()\nh()\nft(), gt()\n", 
+  "trace": [
+    {
+      "exception_msg": "SyntaxError: invalid syntax (, line 5)", 
+      "line": 5, 
+      "event": "uncaught_exception", 
+      "offset": 22
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/john-triple-nesting.golden_py3 b/v3/tests/backend-tests/john-triple-nesting.golden_py3
new file mode 100644
index 000000000..e99b5bfae
--- /dev/null
+++ b/v3/tests/backend-tests/john-triple-nesting.golden_py3
@@ -0,0 +1,3726 @@
+{
+  "code": "# test in Python 3\ndef f(t):\n    def g(t):\n        def h():\n            nonlocal t\n            t += 1\n        return h, lambda: t\n    h, gt = g(0)\n    return h, gt, lambda: t\nh, gt, ft = f(0)\nft(), gt()\nh()\nft(), gt()\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 2, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(t)", 
+          null
+        ]
+      }, 
+      "line": 10, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "t": 0
+          }, 
+          "is_highlighted": true, 
+          "is_parent": false, 
+          "func_name": "f", 
+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "t"
+          ]
+        }
+      ], 
+      "globals": {
+        "f": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "FUNCTION", 
+          "f(t)", 
+          null
+        ]
+      }, 
+      "line": 2, 
+      "event": "call"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
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+          "is_zombie": false, 
+          "parent_frame_id_list": [], 
+          "unique_hash": "f_f1", 
+          "ordered_varnames": [
+            "t"
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+        }
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+      "globals": {
+        "f": [
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+      "heap": {
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+      }, 
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+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "f"
+      ], 
+      "stdout": "", 
+      "func_name": "f", 
+      "stack_to_render": [
+        {
+          "frame_id": 1, 
+          "encoded_locals": {
+            "t": 0, 
+            "g": [
+              "REF", 
+              2
+            ]
+          }, 
+          "is_highlighted": true, 
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+          [
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+            3
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+          [
+            "REF", 
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+          ]
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+        "5": [
+          "FUNCTION", 
+          "()", 
+          2
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+          [
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+          "FUNCTION", 
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+      "event": "return"
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+}

From 8a71ec323fbba127568112576c9b6eeb01f26e81 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 1 Oct 2012 23:30:28 -0700
Subject: [PATCH 449/502] added known limitation and punting for now!

---
 v3/pg_logger.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/v3/pg_logger.py b/v3/pg_logger.py
index 90754e5b8..515e85fde 100644
--- a/v3/pg_logger.py
+++ b/v3/pg_logger.py
@@ -470,6 +470,10 @@ def create_encoded_stack_entry(cur_frame):
             encoded_val = self.encoder.encode(v)
 
             # UGH, this is SUPER ugly but needed for nested function defs
+            #
+            # NB: Known limitation -- this will work only for functions
+            # defined on the top level, not those that are nested within,
+            # say, tuples or lists
             if type(v) in (types.FunctionType, types.MethodType):
               try:
                 enclosing_frame = self.closures[v]
@@ -589,6 +593,10 @@ def create_encoded_stack_entry(cur_frame):
           encoded_val = self.encoder.encode(v)
 
           # UGH, this is SUPER ugly but needed for nested function defs
+          #
+          # NB: Known limitation -- this will work only for functions
+          # defined on the top level, not those that are nested within,
+          # say, tuples or lists
           if type(v) in (types.FunctionType, types.MethodType):
             try:
               enclosing_frame = self.closures[v]

From fba58493e561c3891ae36d0122728b5b68dfdce1 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 1 Oct 2012 23:40:50 -0700
Subject: [PATCH 450/502] added an example to torture students

---
 .../closures/student-torture.golden           |   11 +
 .../closures/student-torture.golden_py3       | 3726 +++++++++++++++++
 v3/example-code/closures/student-torture.txt  |   17 +
 v3/js/opt-frontend.js                         |    5 +
 v3/visualize.html                             |    7 +-
 5 files changed, 3763 insertions(+), 3 deletions(-)
 create mode 100644 v3/example-code/closures/student-torture.golden
 create mode 100644 v3/example-code/closures/student-torture.golden_py3
 create mode 100644 v3/example-code/closures/student-torture.txt

diff --git a/v3/example-code/closures/student-torture.golden b/v3/example-code/closures/student-torture.golden
new file mode 100644
index 000000000..bb48036aa
--- /dev/null
+++ b/v3/example-code/closures/student-torture.golden
@@ -0,0 +1,11 @@
+{
+  "code": "# Example to torture students\n# from UC Berkeley CS61a\n# (only works in Python 3)\n\ndef f(t):\n    def g(t):\n        def h():\n            nonlocal t\n            t += 1\n        return h, lambda: t\n    h, gt = g(0)\n    return h, gt, lambda: t\n\nh, gt, ft = f(0)\nft(), gt()\nh()\nft(), gt()\n", 
+  "trace": [
+    {
+      "exception_msg": "SyntaxError: invalid syntax (, line 8)", 
+      "line": 8, 
+      "event": "uncaught_exception", 
+      "offset": 22
+    }
+  ]
+}
diff --git a/v3/example-code/closures/student-torture.golden_py3 b/v3/example-code/closures/student-torture.golden_py3
new file mode 100644
index 000000000..1541a910c
--- /dev/null
+++ b/v3/example-code/closures/student-torture.golden_py3
@@ -0,0 +1,3726 @@
+{
+  "code": "# Example to torture students\n# from UC Berkeley CS61a\n# (only works in Python 3)\n\ndef f(t):\n    def g(t):\n        def h():\n            nonlocal t\n            t += 1\n        return h, lambda: t\n    h, gt = g(0)\n    return h, gt, lambda: t\n\nh, gt, ft = f(0)\nft(), gt()\nh()\nft(), gt()\n", 
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+}
diff --git a/v3/example-code/closures/student-torture.txt b/v3/example-code/closures/student-torture.txt
new file mode 100644
index 000000000..c4fa0a10e
--- /dev/null
+++ b/v3/example-code/closures/student-torture.txt
@@ -0,0 +1,17 @@
+# Example to torture students
+# from UC Berkeley CS61a
+# (only works in Python 3)
+
+def f(t):
+    def g(t):
+        def h():
+            nonlocal t
+            t += 1
+        return h, lambda: t
+    h, gt = g(0)
+    return h, gt, lambda: t
+
+h, gt, ft = f(0)
+ft(), gt()
+h()
+ft(), gt()
diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 6da40717b..64a8f9fa8 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -373,6 +373,11 @@ $(document).ready(function() {
     $.get("example-code/closures/lambda-param.txt", setCodeMirrorVal);
     return false;
   });
+  $('#tortureLink').click(function() {
+    $.get("example-code/closures/student-torture.txt", setCodeMirrorVal);
+    return false;
+  });
+
 
 
   $('#aliasing1Link').click(function() {
diff --git a/v3/visualize.html b/v3/visualize.html
index 2b5ce5b94..3f5f27863 100644
--- a/v3/visualize.html
+++ b/v3/visualize.html
@@ -108,13 +108,14 @@
 closure 1 |
 closure 2 |
 closure 3 |
-closure 4
+closure 4 |
+closure 5
 
    
 
-closure 5 |
 list map |
 summation |
-lambda param
+lambda param |
+student torture
 
 
    
 

From 167e51e2c46d71dd2018ca52dd2d536bbadd61ec Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 2 Oct 2012 14:49:22 -0700
Subject: [PATCH 451/502] fixed a tiny corner case

---
 v3/pg_encoder.py                          | 11 ++++++-
 v3/tests/backend-tests/cmodule.golden     | 37 +++++++++++++++++++++++
 v3/tests/backend-tests/cmodule.golden_py3 | 37 +++++++++++++++++++++++
 v3/tests/backend-tests/cmodule.txt        |  3 ++
 4 files changed, 87 insertions(+), 1 deletion(-)
 create mode 100644 v3/tests/backend-tests/cmodule.golden
 create mode 100644 v3/tests/backend-tests/cmodule.golden_py3
 create mode 100644 v3/tests/backend-tests/cmodule.txt

diff --git a/v3/pg_encoder.py b/v3/pg_encoder.py
index c57c20f08..1d8c57a7b 100644
--- a/v3/pg_encoder.py
+++ b/v3/pg_encoder.py
@@ -219,7 +219,16 @@ def encode(self, dat):
   def encode_class_or_instance(self, dat, new_obj):
     """Encode dat as a class or instance."""
     if is_instance(dat):
-      class_name = get_name(dat.__class__)
+      if hasattr(dat, '__class__'):
+        # common case ...
+        class_name = get_name(dat.__class__)
+      else:
+        # super special case for something like
+        # "from datetime import datetime_CAPI" in Python 3.2,
+        # which is some weird 'PyCapsule' type ...
+        # http://docs.python.org/release/3.1.5/c-api/capsule.html
+        class_name = get_name(type(dat))
+
       new_obj.extend(['INSTANCE', class_name])
       # don't traverse inside modules, or else risk EXPLODING the visualization
       if class_name == 'module':
diff --git a/v3/tests/backend-tests/cmodule.golden b/v3/tests/backend-tests/cmodule.golden
new file mode 100644
index 000000000..e29fbc456
--- /dev/null
+++ b/v3/tests/backend-tests/cmodule.golden
@@ -0,0 +1,37 @@
+{
+  "code": "# importing some C-ish module ...\n# make sure this doesn't crash in Python 2 or 3\nfrom datetime import datetime_CAPI\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "datetime_CAPI"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "datetime_CAPI": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "PyCapsule", 
+          ""
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/cmodule.golden_py3 b/v3/tests/backend-tests/cmodule.golden_py3
new file mode 100644
index 000000000..562a7996a
--- /dev/null
+++ b/v3/tests/backend-tests/cmodule.golden_py3
@@ -0,0 +1,37 @@
+{
+  "code": "# importing some C-ish module ...\n# make sure this doesn't crash in Python 2 or 3\nfrom datetime import datetime_CAPI\n", 
+  "trace": [
+    {
+      "ordered_globals": [], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {}, 
+      "heap": {}, 
+      "line": 3, 
+      "event": "step_line"
+    }, 
+    {
+      "ordered_globals": [
+        "datetime_CAPI"
+      ], 
+      "stdout": "", 
+      "func_name": "", 
+      "stack_to_render": [], 
+      "globals": {
+        "datetime_CAPI": [
+          "REF", 
+          1
+        ]
+      }, 
+      "heap": {
+        "1": [
+          "INSTANCE", 
+          "PyCapsule"
+        ]
+      }, 
+      "line": 3, 
+      "event": "return"
+    }
+  ]
+}
diff --git a/v3/tests/backend-tests/cmodule.txt b/v3/tests/backend-tests/cmodule.txt
new file mode 100644
index 000000000..53bb90850
--- /dev/null
+++ b/v3/tests/backend-tests/cmodule.txt
@@ -0,0 +1,3 @@
+# importing some C-ish module ...
+# make sure this doesn't crash in Python 2 or 3
+from datetime import datetime_CAPI

From 6e26f9184c0fa010928252a39d1dee098ed44fd0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 2 Oct 2012 16:01:13 -0700
Subject: [PATCH 452/502] committed john's updates to generate_json_trace.py
 script

---
 v3/generate_json_trace.py | 29 +++++++++++------------------
 1 file changed, 11 insertions(+), 18 deletions(-)

diff --git a/v3/generate_json_trace.py b/v3/generate_json_trace.py
index 117eade81..af3c336fa 100644
--- a/v3/generate_json_trace.py
+++ b/v3/generate_json_trace.py
@@ -1,18 +1,7 @@
 # Generates a JSON trace that is compatible with the js/pytutor.js frontend
 
-import optparse
-
-CUMULATIVE_MODE = False
-
-COMPACT = False
-if COMPACT:
-  INDENT_LEVEL=None
-else:
-  INDENT_LEVEL=2
-
-
 import sys, pg_logger, json
-
+from optparse import OptionParser
 
 # To make regression tests work consistently across platforms,
 # standardize display of floats to 3 significant figures
@@ -21,27 +10,31 @@
 # http://stackoverflow.com/questions/1447287/format-floats-with-standard-json-module
 json.encoder.FLOAT_REPR = lambda f: ('%.3f' % f)
 
-
 def json_finalizer(input_code, output_trace):
   ret = dict(code=input_code, trace=output_trace)
   json_output = json.dumps(ret, indent=INDENT_LEVEL)
   print(json_output)
 
-
 def js_var_finalizer(input_code, output_trace):
   global JS_VARNAME
   ret = dict(code=input_code, trace=output_trace)
   json_output = json.dumps(ret, indent=None)
   print("var %s = %s;" % (JS_VARNAME, json_output))
 
-
-parser = optparse.OptionParser()
+parser = OptionParser(usage="Generate JSON trace for pytutor")
+parser.add_option('-c', '--cumulative', default=False, action='store_true',
+        help='output cumulative trace.')
+parser.add_option('-o', '--compact', default=False, action='store_true',
+        help='output compact trace.')
 parser.add_option("--create_jsvar", dest="js_varname",
                   help="Create a JavaScript variable out of the trace")
 (options, args) = parser.parse_args()
+INDENT_LEVEL = None if options.compact else 2
+
+fin = sys.stdin if args[0] == "-" else open(args[0])
 
 if options.js_varname:
   JS_VARNAME = options.js_varname
-  pg_logger.exec_script_str(open(args[0]).read(), CUMULATIVE_MODE, js_var_finalizer)
+  pg_logger.exec_script_str(fin.read(), options.cumulative, js_var_finalizer)
 else:
-  pg_logger.exec_script_str(open(args[0]).read(), CUMULATIVE_MODE, json_finalizer)
+  pg_logger.exec_script_str(fin.read(), options.cumulative, json_finalizer)

From 618bcef82c836e2896ddd4e9bf5dcb84b7dd1655 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 2 Oct 2012 16:30:17 -0700
Subject: [PATCH 453/502] beautiful further fix to show parent frames of
 functions nested within data structures (by John DeNero)

---
 .../closures/student-torture.golden_py3       |  4 +--
 v3/pg_encoder.py                              | 19 ++++++----
 v3/pg_logger.py                               | 36 +++++--------------
 .../backend-tests/john-lambda-lambda.golden   |  4 +--
 .../john-lambda-lambda.golden_py3             |  4 +--
 .../john-triple-nesting.golden_py3            |  4 +--
 6 files changed, 28 insertions(+), 43 deletions(-)

diff --git a/v3/example-code/closures/student-torture.golden_py3 b/v3/example-code/closures/student-torture.golden_py3
index 1541a910c..b6d799315 100644
--- a/v3/example-code/closures/student-torture.golden_py3
+++ b/v3/example-code/closures/student-torture.golden_py3
@@ -460,7 +460,7 @@
         "5": [
           "FUNCTION", 
           "()", 
-          null
+          2
         ]
       }, 
       "line": 10, 
@@ -699,7 +699,7 @@
         "7": [
           "FUNCTION", 
           "()", 
-          null
+          1
         ]
       }, 
       "line": 12, 
diff --git a/v3/pg_encoder.py b/v3/pg_encoder.py
index 1d8c57a7b..c47a05169 100644
--- a/v3/pg_encoder.py
+++ b/v3/pg_encoder.py
@@ -122,7 +122,8 @@ def set_function_parent_frame_ID(self, ref_obj, enclosing_frame_id):
 
   # return either a primitive object or an object reference;
   # and as a side effect, update encoded_heap_objects
-  def encode(self, dat):
+  def encode(self, dat, get_parent):
+    """Encode a data value DAT using the GET_PARENT function for parent ids."""
     # primitive type
     if type(dat) in (int, long, float, str, bool, type(None)):
       if type(dat) is float:
@@ -159,21 +160,21 @@ def encode(self, dat):
       if typ == list:
         new_obj.append('LIST')
         for e in dat:
-          new_obj.append(self.encode(e))
+          new_obj.append(self.encode(e, get_parent))
       elif typ == tuple:
         new_obj.append('TUPLE')
         for e in dat:
-          new_obj.append(self.encode(e))
+          new_obj.append(self.encode(e, get_parent))
       elif typ == set:
         new_obj.append('SET')
         for e in dat:
-          new_obj.append(self.encode(e))
+          new_obj.append(self.encode(e, get_parent))
       elif typ == dict:
         new_obj.append('DICT')
         for (k, v) in dat.items():
           # don't display some built-in locals ...
           if k not in ('__module__', '__return__', '__locals__'):
-            new_obj.append([self.encode(k), self.encode(v)])
+            new_obj.append([self.encode(k, get_parent), self.encode(v, get_parent)])
       elif typ in (types.FunctionType, types.MethodType):
         if is_python3:
           argspec = inspect.getfullargspec(dat)
@@ -195,7 +196,11 @@ def encode(self, dat):
 
         func_name = get_name(dat)
         pretty_name = func_name + '(' + ', '.join(printed_args) + ')'
-        new_obj.extend(['FUNCTION', pretty_name, None]) # the final element will be filled in later
+        encoded_val = ['FUNCTION', pretty_name, None]
+        if get_parent:
+          enclosing_frame_id = get_parent(dat)
+          encoded_val[2] = enclosing_frame_id
+        new_obj.extend(encoded_val)
       elif typ is types.BuiltinFunctionType:
         pretty_name = get_name(dat) + '(...)'
         new_obj.extend(['FUNCTION', pretty_name, None])
@@ -247,5 +252,5 @@ def encode_class_or_instance(self, dat, new_obj):
       user_attrs = []
 
     for attr in user_attrs:
-      new_obj.append([self.encode(attr), self.encode(dat.__dict__[attr])])
+      new_obj.append([self.encode(attr, None), self.encode(dat.__dict__[attr], None)])
 
diff --git a/v3/pg_logger.py b/v3/pg_logger.py
index 515e85fde..ce8a477d5 100644
--- a/v3/pg_logger.py
+++ b/v3/pg_logger.py
@@ -247,6 +247,12 @@ def __init__(self, cumulative_mode, finalizer_func):
     def get_frame_id(self, cur_frame):
       return self.frame_ordered_ids[cur_frame]
 
+    # Returns the (lexical) parent of a function value.
+    def get_parent_of_function(self, val):
+      if val not in self.closures:
+        return None
+      return self.get_frame_id(self.closures[val])
+
 
     # Returns the (lexical) parent frame of the function that was called
     # to create the stack frame 'frame'.
@@ -467,20 +473,7 @@ def create_encoded_stack_entry(cur_frame):
             if k == '__module__':
               continue
 
-            encoded_val = self.encoder.encode(v)
-
-            # UGH, this is SUPER ugly but needed for nested function defs
-            #
-            # NB: Known limitation -- this will work only for functions
-            # defined on the top level, not those that are nested within,
-            # say, tuples or lists
-            if type(v) in (types.FunctionType, types.MethodType):
-              try:
-                enclosing_frame = self.closures[v]
-                enclosing_frame_id = self.get_frame_id(enclosing_frame)
-                self.encoder.set_function_parent_frame_ID(encoded_val, enclosing_frame_id)
-              except KeyError:
-                pass
+            encoded_val = self.encoder.encode(v, self.get_parent_of_function)
             encoded_locals[k] = encoded_val
 
 
@@ -590,20 +583,7 @@ def create_encoded_stack_entry(cur_frame):
         # effects of aliasing later down the line ...
         encoded_globals = {}
         for (k, v) in get_user_globals(tos[0]).items():
-          encoded_val = self.encoder.encode(v)
-
-          # UGH, this is SUPER ugly but needed for nested function defs
-          #
-          # NB: Known limitation -- this will work only for functions
-          # defined on the top level, not those that are nested within,
-          # say, tuples or lists
-          if type(v) in (types.FunctionType, types.MethodType):
-            try:
-              enclosing_frame = self.closures[v]
-              enclosing_frame_id = self.get_frame_id(enclosing_frame)
-              self.encoder.set_function_parent_frame_ID(encoded_val, enclosing_frame_id)
-            except KeyError:
-              pass
+          encoded_val = self.encoder.encode(v, self.get_parent_of_function)
           encoded_globals[k] = encoded_val
 
           if k not in self.all_globals_in_order:
diff --git a/v3/tests/backend-tests/john-lambda-lambda.golden b/v3/tests/backend-tests/john-lambda-lambda.golden
index 8cfb591a5..c1ddaf182 100644
--- a/v3/tests/backend-tests/john-lambda-lambda.golden
+++ b/v3/tests/backend-tests/john-lambda-lambda.golden
@@ -326,7 +326,7 @@
         "4": [
           "FUNCTION", 
           "(b)", 
-          null
+          2
         ]
       }, 
       "line": 5, 
@@ -462,7 +462,7 @@
         "4": [
           "FUNCTION", 
           "(b)", 
-          null
+          2
         ]
       }, 
       "line": 5, 
diff --git a/v3/tests/backend-tests/john-lambda-lambda.golden_py3 b/v3/tests/backend-tests/john-lambda-lambda.golden_py3
index 8cfb591a5..c1ddaf182 100644
--- a/v3/tests/backend-tests/john-lambda-lambda.golden_py3
+++ b/v3/tests/backend-tests/john-lambda-lambda.golden_py3
@@ -326,7 +326,7 @@
         "4": [
           "FUNCTION", 
           "(b)", 
-          null
+          2
         ]
       }, 
       "line": 5, 
@@ -462,7 +462,7 @@
         "4": [
           "FUNCTION", 
           "(b)", 
-          null
+          2
         ]
       }, 
       "line": 5, 
diff --git a/v3/tests/backend-tests/john-triple-nesting.golden_py3 b/v3/tests/backend-tests/john-triple-nesting.golden_py3
index e99b5bfae..8c9415e9b 100644
--- a/v3/tests/backend-tests/john-triple-nesting.golden_py3
+++ b/v3/tests/backend-tests/john-triple-nesting.golden_py3
@@ -460,7 +460,7 @@
         "5": [
           "FUNCTION", 
           "()", 
-          null
+          2
         ]
       }, 
       "line": 7, 
@@ -699,7 +699,7 @@
         "7": [
           "FUNCTION", 
           "()", 
-          null
+          1
         ]
       }, 
       "line": 9, 

From d1cb398711431364f502ad220198d9288d80f6dd Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 2 Oct 2012 22:00:42 -0700
Subject: [PATCH 454/502] added demo

---
 v3/commentary-bubbles-demo.html | 36 +++++++++++++++++++++++++++++++++
 v3/commentary-bubbles-demo.js   | 13 ++++++++++++
 2 files changed, 49 insertions(+)
 create mode 100644 v3/commentary-bubbles-demo.html
 create mode 100644 v3/commentary-bubbles-demo.js

diff --git a/v3/commentary-bubbles-demo.html b/v3/commentary-bubbles-demo.html
new file mode 100644
index 000000000..541dcddb5
--- /dev/null
+++ b/v3/commentary-bubbles-demo.html
@@ -0,0 +1,36 @@
+
+
+
+
+  Online Python Tutor commentary bubbles demo
+
+
+
+
+ 
+ 
+ 
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ 
+
+
    • 
   
    
     
 
@@ -137,7 +133,6 @@ 
    Embed visualizations in digital textbooks
    
 
 
 
-
         		
     
 
@@ -165,7 +160,6 @@ 
    Share visualizations online
    
 
 
    
 
-
 
    
 More Details:
 
      
@@ -191,8 +185,6 @@ 
      Share visualizations online
      
 
    
 
    
 
- 
-
 
    
 
         		
 
 
        
                  
              
    1def listSum(numbers):
    2  if not numbers:
    3    return 0
    4  else:
    5    (f, rest) = numbers
    6    return f + listSum(rest)
    7
    8myList = (1, (2, (3, None)))
    9total = listSum(myList)
                        
              
                                        Step 12 of 18                                  
                      
            
     line that has just executed
     next line to execute
            
            Program output:
                    
              		              
              
                
                                  
                      
    Frames
                    
    Global variables
    listSum
     
    myList
     
                    
                    
    listSum
    numbers
     
    f1
    rest
     
    listSum
    numbers
     
    f2
    rest
     
    listSum
    numbers
     
    f3
    restNone
                      		                              
                      
    Objects
                    
    function listSum(numbers)
    tuple
    01
    1
     
    tuple
    01
    2
     
    tuple
    01
    3None
                      		            
              
            
              		    
      
    • 
+
+
+
diff --git a/v3/commentary-bubbles-demo.js b/v3/commentary-bubbles-demo.js
new file mode 100644
index 000000000..3d9f69712
--- /dev/null
+++ b/v3/commentary-bubbles-demo.js
@@ -0,0 +1,13 @@
+// Run:
+//   python generate_json_trace.py --create_jsvar=listSumTrace tests/backend-tests/list_sum.txt
+// and copy-and-paste the output line into here:
+var listSumTrace = {"code": "def listSum(numbers):\n  if not numbers:\n    return 0\n  else:\n    (f, rest) = numbers\n    return f + listSum(rest)\n\nmyList = (1, (2, (3, None)))\ntotal = listSum(myList)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 1, "event": "step_line"}, {"ordered_globals": ["listSum"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null]}, "line": 8, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 9, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 1, "event": "call"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 1, "event": "call"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], 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{"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4], "rest": null, "f": 3}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, 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{"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4], "rest": null, "f": 3}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 4, "encoded_locals": {"numbers": null}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f4", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 1, "event": "call"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", 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["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4], "rest": null, "f": 3}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 4, "encoded_locals": {"__return__": 0, "numbers": null}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f4", "ordered_varnames": ["numbers", "__return__"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 3, "event": 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["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "return"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"__return__": 5, "numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest", "__return__"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "return"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"__return__": 6, "numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest", "__return__"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "return"}, {"ordered_globals": ["listSum", "myList", "total"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"total": 6, "myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 9, "event": "return"}]};
+
+
+/*
+$(document).ready(function() {
+  var listSumVisualizer = new ExecutionVisualizer('listSumDiv', listSumTrace,
+                                                  {embeddedMode: false,
+                                                   editCodeBaseURL: 'http://pythontutor.com/visualize.html'});
+});
+*/

From b8e26187c37b91c4c100a1c7d54a07f68ed2e506 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 3 Oct 2012 11:21:12 -0700
Subject: [PATCH 455/502] Update v3/docs/project-ideas.md

---
 v3/docs/project-ideas.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/v3/docs/project-ideas.md b/v3/docs/project-ideas.md
index 6fd2e78b8..50b432db5 100644
--- a/v3/docs/project-ideas.md
+++ b/v3/docs/project-ideas.md
@@ -32,6 +32,14 @@ so that OPT visualizations (and the surrounding user interface) look good on dis
 ranging from smartphones to tablets to laptops to giant desktop monitors.
 
 
+## Offline mode for use as a production debugger (medium)
+
+From a reader comment: "As a teaching tool it is invaluable, not only for teaching python, but for programming in general (what is going on in memory...).
+I've actively used it to debug / trace short pieces of code. Any chance of having it offline (and without the limitations of an online tool like the inability to load all modules)? That would make a perfect pdb visualization tool."
+
+You could imagine running a webserver on localhost and using OPT as a graphical frontend for pdb; interesting idea!
+
+
 ## Optimize display of object-oriented programs (medium)
 
 This is a good project for an object-oriented programming enthusiast.

From c0cdb4e785138cd3a1e4860ddaf3b959cdacaa79 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 4 Oct 2012 16:43:59 -0700
Subject: [PATCH 456/502] detach jsPlumb connectors from stack frame values
 when they disappear and prepare for jquery 1.8 migration

---
 .../jquery-ui-1.8.24.custom.css}              | 64 +++++++++-------
 v3/js/jquery-1.8.2.min.js                     |  2 +
 v3/js/jquery-ui-1.8.24.custom.min.js          | 21 +++++
 v3/js/jquery.jsPlumb-1.3.15-all-min.js        |  1 +
 v3/js/pytutor.js                              | 76 ++++++++++++-------
 5 files changed, 108 insertions(+), 56 deletions(-)
 rename v3/css/{smoothness/jquery-ui-1.8.21.custom.css => ui-lightness/jquery-ui-1.8.24.custom.css} (80%)
 create mode 100644 v3/js/jquery-1.8.2.min.js
 create mode 100644 v3/js/jquery-ui-1.8.24.custom.min.js
 create mode 100644 v3/js/jquery.jsPlumb-1.3.15-all-min.js

diff --git a/v3/css/smoothness/jquery-ui-1.8.21.custom.css b/v3/css/ui-lightness/jquery-ui-1.8.24.custom.css
similarity index 80%
rename from v3/css/smoothness/jquery-ui-1.8.21.custom.css
rename to v3/css/ui-lightness/jquery-ui-1.8.24.custom.css
index 737a94d4f..71156ca03 100644
--- a/v3/css/smoothness/jquery-ui-1.8.21.custom.css
+++ b/v3/css/ui-lightness/jquery-ui-1.8.24.custom.css
@@ -1,5 +1,5 @@
 /*!
- * jQuery UI CSS Framework 1.8.21
+ * jQuery UI CSS Framework 1.8.24
  *
  * Copyright 2012, AUTHORS.txt (http://jqueryui.com/about)
  * Dual licensed under the MIT or GPL Version 2 licenses.
@@ -39,7 +39,7 @@
 
 
 /*!
- * jQuery UI CSS Framework 1.8.21
+ * jQuery UI CSS Framework 1.8.24
  *
  * Copyright 2012, AUTHORS.txt (http://jqueryui.com/about)
  * Dual licensed under the MIT or GPL Version 2 licenses.
@@ -47,37 +47,43 @@
  *
  * http://docs.jquery.com/UI/Theming/API
  *
- * To view and modify this theme, visit http://jqueryui.com/themeroller/?ffDefault=Verdana,Arial,sans-serif&fwDefault=normal&fsDefault=1.1em&cornerRadius=4px&bgColorHeader=cccccc&bgTextureHeader=03_highlight_soft.png&bgImgOpacityHeader=75&borderColorHeader=aaaaaa&fcHeader=222222&iconColorHeader=222222&bgColorContent=ffffff&bgTextureContent=01_flat.png&bgImgOpacityContent=75&borderColorContent=aaaaaa&fcContent=222222&iconColorContent=222222&bgColorDefault=e6e6e6&bgTextureDefault=02_glass.png&bgImgOpacityDefault=75&borderColorDefault=d3d3d3&fcDefault=555555&iconColorDefault=888888&bgColorHover=dadada&bgTextureHover=02_glass.png&bgImgOpacityHover=75&borderColorHover=999999&fcHover=212121&iconColorHover=454545&bgColorActive=ffffff&bgTextureActive=02_glass.png&bgImgOpacityActive=65&borderColorActive=aaaaaa&fcActive=212121&iconColorActive=454545&bgColorHighlight=fbf9ee&bgTextureHighlight=02_glass.png&bgImgOpacityHighlight=55&borderColorHighlight=fcefa1&fcHighlight=363636&iconColorHighlight=2e83ff&bgColorError=fef1ec&bgTextureError=02_glass.png&bgImgOpacityError=95&borderColorError=cd0a0a&fcError=cd0a0a&iconColorError=cd0a0a&bgColorOverlay=aaaaaa&bgTextureOverlay=01_flat.png&bgImgOpacityOverlay=0&opacityOverlay=30&bgColorShadow=aaaaaa&bgTextureShadow=01_flat.png&bgImgOpacityShadow=0&opacityShadow=30&thicknessShadow=8px&offsetTopShadow=-8px&offsetLeftShadow=-8px&cornerRadiusShadow=8px
+ * To view and modify this theme, visit http://jqueryui.com/themeroller/?ffDefault=Trebuchet%20MS,%20Tahoma,%20Verdana,%20Arial,%20sans-serif&fwDefault=bold&fsDefault=1.1em&cornerRadius=4px&bgColorHeader=f6a828&bgTextureHeader=12_gloss_wave.png&bgImgOpacityHeader=35&borderColorHeader=e78f08&fcHeader=ffffff&iconColorHeader=ffffff&bgColorContent=eeeeee&bgTextureContent=03_highlight_soft.png&bgImgOpacityContent=100&borderColorContent=dddddd&fcContent=333333&iconColorContent=222222&bgColorDefault=f6f6f6&bgTextureDefault=02_glass.png&bgImgOpacityDefault=100&borderColorDefault=cccccc&fcDefault=1c94c4&iconColorDefault=ef8c08&bgColorHover=fdf5ce&bgTextureHover=02_glass.png&bgImgOpacityHover=100&borderColorHover=fbcb09&fcHover=c77405&iconColorHover=ef8c08&bgColorActive=ffffff&bgTextureActive=02_glass.png&bgImgOpacityActive=65&borderColorActive=fbd850&fcActive=eb8f00&iconColorActive=ef8c08&bgColorHighlight=ffe45c&bgTextureHighlight=03_highlight_soft.png&bgImgOpacityHighlight=75&borderColorHighlight=fed22f&fcHighlight=363636&iconColorHighlight=228ef1&bgColorError=b81900&bgTextureError=08_diagonals_thick.png&bgImgOpacityError=18&borderColorError=cd0a0a&fcError=ffffff&iconColorError=ffd27a&bgColorOverlay=666666&bgTextureOverlay=08_diagonals_thick.png&bgImgOpacityOverlay=20&opacityOverlay=50&bgColorShadow=000000&bgTextureShadow=01_flat.png&bgImgOpacityShadow=10&opacityShadow=20&thicknessShadow=5px&offsetTopShadow=-5px&offsetLeftShadow=-5px&cornerRadiusShadow=5px
  */
 
 
 /* Component containers
 ----------------------------------*/
-.ui-widget { font-family: Verdana,Arial,sans-serif; font-size: 1.1em; }
+.ui-widget { font-family: Trebuchet MS, Tahoma, Verdana, Arial, sans-serif; font-size: 1.1em; }
 .ui-widget .ui-widget { font-size: 1em; }
-.ui-widget input, .ui-widget select, .ui-widget textarea, .ui-widget button { font-family: Verdana,Arial,sans-serif; font-size: 1em; }
-.ui-widget-content { border: 1px solid #aaaaaa; background: #ffffff url(images/ui-bg_flat_75_ffffff_40x100.png) 50% 50% repeat-x; color: #222222; }
-.ui-widget-content a { color: #222222; }
-.ui-widget-header { border: 1px solid #aaaaaa; background: #cccccc url(images/ui-bg_highlight-soft_75_cccccc_1x100.png) 50% 50% repeat-x; color: #222222; font-weight: bold; }
-.ui-widget-header a { color: #222222; }
+.ui-widget input, .ui-widget select, .ui-widget textarea, .ui-widget button { font-family: Trebuchet MS, Tahoma, Verdana, Arial, sans-serif; font-size: 1em; }
+/* pgbovine - switch border from #dddddd to #ccc */
+.ui-widget-content { border: 1px solid #ccc; background: #eeeeee url(images/ui-bg_highlight-soft_100_eeeeee_1x100.png) 50% top repeat-x; color: #333333; }
+.ui-widget-content a { color: #333333; }
+.ui-widget-header { border: 1px solid #e78f08; background: #f6a828 url(images/ui-bg_gloss-wave_35_f6a828_500x100.png) 50% 50% repeat-x; color: #ffffff; font-weight: bold; }
+.ui-widget-header a { color: #ffffff; }
 
 /* Interaction states
 ----------------------------------*/
-.ui-state-default, .ui-widget-content .ui-state-default, .ui-widget-header .ui-state-default { border: 1px solid #d3d3d3; background: #e6e6e6 url(images/ui-bg_glass_75_e6e6e6_1x400.png) 50% 50% repeat-x; font-weight: normal; color: #555555; }
-.ui-state-default a, .ui-state-default a:link, .ui-state-default a:visited { color: #555555; text-decoration: none; }
-.ui-state-hover, .ui-widget-content .ui-state-hover, .ui-widget-header .ui-state-hover, .ui-state-focus, .ui-widget-content .ui-state-focus, .ui-widget-header .ui-state-focus { border: 1px solid #999999; background: #dadada url(images/ui-bg_glass_75_dadada_1x400.png) 50% 50% repeat-x; font-weight: normal; color: #212121; }
-.ui-state-hover a, .ui-state-hover a:hover { color: #212121; text-decoration: none; }
-.ui-state-active, .ui-widget-content .ui-state-active, .ui-widget-header .ui-state-active { border: 1px solid #aaaaaa; background: #ffffff url(images/ui-bg_glass_65_ffffff_1x400.png) 50% 50% repeat-x; font-weight: normal; color: #212121; }
-.ui-state-active a, .ui-state-active a:link, .ui-state-active a:visited { color: #212121; text-decoration: none; }
+.ui-state-default, .ui-widget-content .ui-state-default, .ui-widget-header .ui-state-default { border: 1px solid #cccccc; background: #f6f6f6 url(images/ui-bg_glass_100_f6f6f6_1x400.png) 50% 50% repeat-x; font-weight: bold; color: #1c94c4; }
+.ui-state-default a, .ui-state-default a:link, .ui-state-default a:visited { color: #1c94c4; text-decoration: none; }
+
+/* pgbovine - eliminate hover colors */
+/*
+.ui-state-hover, .ui-widget-content .ui-state-hover, .ui-widget-header .ui-state-hover, .ui-state-focus, .ui-widget-content .ui-state-focus, .ui-widget-header .ui-state-focus { border: 1px solid #fbcb09; background: #fdf5ce url(images/ui-bg_glass_100_fdf5ce_1x400.png) 50% 50% repeat-x; font-weight: bold; color: #c77405; }
+.ui-state-hover a, .ui-state-hover a:hover { color: #c77405; text-decoration: none; }
+*/
+
+.ui-state-active, .ui-widget-content .ui-state-active, .ui-widget-header .ui-state-active { border: 1px solid #fbd850; background: #ffffff url(images/ui-bg_glass_65_ffffff_1x400.png) 50% 50% repeat-x; font-weight: bold; color: #eb8f00; }
+.ui-state-active a, .ui-state-active a:link, .ui-state-active a:visited { color: #eb8f00; text-decoration: none; }
 .ui-widget :active { outline: none; }
 
 /* Interaction Cues
 ----------------------------------*/
-.ui-state-highlight, .ui-widget-content .ui-state-highlight, .ui-widget-header .ui-state-highlight  {border: 1px solid #fcefa1; background: #fbf9ee url(images/ui-bg_glass_55_fbf9ee_1x400.png) 50% 50% repeat-x; color: #363636; }
+.ui-state-highlight, .ui-widget-content .ui-state-highlight, .ui-widget-header .ui-state-highlight  {border: 1px solid #fed22f; background: #ffe45c url(images/ui-bg_highlight-soft_75_ffe45c_1x100.png) 50% top repeat-x; color: #363636; }
 .ui-state-highlight a, .ui-widget-content .ui-state-highlight a,.ui-widget-header .ui-state-highlight a { color: #363636; }
-.ui-state-error, .ui-widget-content .ui-state-error, .ui-widget-header .ui-state-error {border: 1px solid #cd0a0a; background: #fef1ec url(images/ui-bg_glass_95_fef1ec_1x400.png) 50% 50% repeat-x; color: #cd0a0a; }
-.ui-state-error a, .ui-widget-content .ui-state-error a, .ui-widget-header .ui-state-error a { color: #cd0a0a; }
-.ui-state-error-text, .ui-widget-content .ui-state-error-text, .ui-widget-header .ui-state-error-text { color: #cd0a0a; }
+.ui-state-error, .ui-widget-content .ui-state-error, .ui-widget-header .ui-state-error {border: 1px solid #cd0a0a; background: #b81900 url(images/ui-bg_diagonals-thick_18_b81900_40x40.png) 50% 50% repeat; color: #ffffff; }
+.ui-state-error a, .ui-widget-content .ui-state-error a, .ui-widget-header .ui-state-error a { color: #ffffff; }
+.ui-state-error-text, .ui-widget-content .ui-state-error-text, .ui-widget-header .ui-state-error-text { color: #ffffff; }
 .ui-priority-primary, .ui-widget-content .ui-priority-primary, .ui-widget-header .ui-priority-primary { font-weight: bold; }
 .ui-priority-secondary, .ui-widget-content .ui-priority-secondary,  .ui-widget-header .ui-priority-secondary { opacity: .7; filter:Alpha(Opacity=70); font-weight: normal; }
 .ui-state-disabled, .ui-widget-content .ui-state-disabled, .ui-widget-header .ui-state-disabled { opacity: .35; filter:Alpha(Opacity=35); background-image: none; }
@@ -88,12 +94,12 @@
 /* states and images */
 .ui-icon { width: 16px; height: 16px; background-image: url(images/ui-icons_222222_256x240.png); }
 .ui-widget-content .ui-icon {background-image: url(images/ui-icons_222222_256x240.png); }
-.ui-widget-header .ui-icon {background-image: url(images/ui-icons_222222_256x240.png); }
-.ui-state-default .ui-icon { background-image: url(images/ui-icons_888888_256x240.png); }
-.ui-state-hover .ui-icon, .ui-state-focus .ui-icon {background-image: url(images/ui-icons_454545_256x240.png); }
-.ui-state-active .ui-icon {background-image: url(images/ui-icons_454545_256x240.png); }
-.ui-state-highlight .ui-icon {background-image: url(images/ui-icons_2e83ff_256x240.png); }
-.ui-state-error .ui-icon, .ui-state-error-text .ui-icon {background-image: url(images/ui-icons_cd0a0a_256x240.png); }
+.ui-widget-header .ui-icon {background-image: url(images/ui-icons_ffffff_256x240.png); }
+.ui-state-default .ui-icon { background-image: url(images/ui-icons_ef8c08_256x240.png); }
+.ui-state-hover .ui-icon, .ui-state-focus .ui-icon {background-image: url(images/ui-icons_ef8c08_256x240.png); }
+.ui-state-active .ui-icon {background-image: url(images/ui-icons_ef8c08_256x240.png); }
+.ui-state-highlight .ui-icon {background-image: url(images/ui-icons_228ef1_256x240.png); }
+.ui-state-error .ui-icon, .ui-state-error-text .ui-icon {background-image: url(images/ui-icons_ffd27a_256x240.png); }
 
 /* positioning */
 .ui-icon-carat-1-n { background-position: 0 0; }
@@ -283,9 +289,9 @@
 .ui-corner-all, .ui-corner-bottom, .ui-corner-right, .ui-corner-br { -moz-border-radius-bottomright: 4px; -webkit-border-bottom-right-radius: 4px; -khtml-border-bottom-right-radius: 4px; border-bottom-right-radius: 4px; }
 
 /* Overlays */
-.ui-widget-overlay { background: #aaaaaa url(images/ui-bg_flat_0_aaaaaa_40x100.png) 50% 50% repeat-x; opacity: .30;filter:Alpha(Opacity=30); }
-.ui-widget-shadow { margin: -8px 0 0 -8px; padding: 8px; background: #aaaaaa url(images/ui-bg_flat_0_aaaaaa_40x100.png) 50% 50% repeat-x; opacity: .30;filter:Alpha(Opacity=30); -moz-border-radius: 8px; -khtml-border-radius: 8px; -webkit-border-radius: 8px; border-radius: 8px; }/*!
- * jQuery UI Slider 1.8.21
+.ui-widget-overlay { background: #666666 url(images/ui-bg_diagonals-thick_20_666666_40x40.png) 50% 50% repeat; opacity: .50;filter:Alpha(Opacity=50); }
+.ui-widget-shadow { margin: -5px 0 0 -5px; padding: 5px; background: #000000 url(images/ui-bg_flat_10_000000_40x100.png) 50% 50% repeat-x; opacity: .20;filter:Alpha(Opacity=20); -moz-border-radius: 5px; -khtml-border-radius: 5px; -webkit-border-radius: 5px; border-radius: 5px; }/*!
+ * jQuery UI Slider 1.8.24
  *
  * Copyright 2012, AUTHORS.txt (http://jqueryui.com/about)
  * Dual licensed under the MIT or GPL Version 2 licenses.
@@ -307,4 +313,4 @@
 .ui-slider-vertical .ui-slider-handle { left: -.3em; margin-left: 0; margin-bottom: -.6em; }
 .ui-slider-vertical .ui-slider-range { left: 0; width: 100%; }
 .ui-slider-vertical .ui-slider-range-min { bottom: 0; }
-.ui-slider-vertical .ui-slider-range-max { top: 0; }
\ No newline at end of file
+.ui-slider-vertical .ui-slider-range-max { top: 0; }
diff --git a/v3/js/jquery-1.8.2.min.js b/v3/js/jquery-1.8.2.min.js
new file mode 100644
index 000000000..f65cf1dc4
--- /dev/null
+++ b/v3/js/jquery-1.8.2.min.js
@@ -0,0 +1,2 @@
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+* Copyright (c) 2012 AUTHORS.txt; Licensed MIT, GPL */
+(function(a,b){a.ui=a.ui||{};var c=/left|center|right/,d=/top|center|bottom/,e="center",f={},g=a.fn.position,h=a.fn.offset;a.fn.position=function(b){if(!b||!b.of)return g.apply(this,arguments);b=a.extend({},b);var h=a(b.of),i=h[0],j=(b.collision||"flip").split(" "),k=b.offset?b.offset.split(" "):[0,0],l,m,n;return i.nodeType===9?(l=h.width(),m=h.height(),n={top:0,left:0}):i.setTimeout?(l=h.width(),m=h.height(),n={top:h.scrollTop(),left:h.scrollLeft()}):i.preventDefault?(b.at="left top",l=m=0,n={top:b.of.pageY,left:b.of.pageX}):(l=h.outerWidth(),m=h.outerHeight(),n=h.offset()),a.each(["my","at"],function(){var a=(b[this]||"").split(" ");a.length===1&&(a=c.test(a[0])?a.concat([e]):d.test(a[0])?[e].concat(a):[e,e]),a[0]=c.test(a[0])?a[0]:e,a[1]=d.test(a[1])?a[1]:e,b[this]=a}),j.length===1&&(j[1]=j[0]),k[0]=parseInt(k[0],10)||0,k.length===1&&(k[1]=k[0]),k[1]=parseInt(k[1],10)||0,b.at[0]==="right"?n.left+=l:b.at[0]===e&&(n.left+=l/2),b.at[1]==="bottom"?n.top+=m:b.at[1]===e&&(n.top+=m/2),n.left+=k[0],n.top+=k[1],this.each(function(){var c=a(this),d=c.outerWidth(),g=c.outerHeight(),h=parseInt(a.curCSS(this,"marginLeft",!0))||0,i=parseInt(a.curCSS(this,"marginTop",!0))||0,o=d+h+(parseInt(a.curCSS(this,"marginRight",!0))||0),p=g+i+(parseInt(a.curCSS(this,"marginBottom",!0))||0),q=a.extend({},n),r;b.my[0]==="right"?q.left-=d:b.my[0]===e&&(q.left-=d/2),b.my[1]==="bottom"?q.top-=g:b.my[1]===e&&(q.top-=g/2),f.fractions||(q.left=Math.round(q.left),q.top=Math.round(q.top)),r={left:q.left-h,top:q.top-i},a.each(["left","top"],function(c,e){a.ui.position[j[c]]&&a.ui.position[j[c]][e](q,{targetWidth:l,targetHeight:m,elemWidth:d,elemHeight:g,collisionPosition:r,collisionWidth:o,collisionHeight:p,offset:k,my:b.my,at:b.at})}),a.fn.bgiframe&&c.bgiframe(),c.offset(a.extend(q,{using:b.using}))})},a.ui.position={fit:{left:function(b,c){var d=a(window),e=c.collisionPosition.left+c.collisionWidth-d.width()-d.scrollLeft();b.left=e>0?b.left-e:Math.max(b.left-c.collisionPosition.left,b.left)},top:function(b,c){var d=a(window),e=c.collisionPosition.top+c.collisionHeight-d.height()-d.scrollTop();b.top=e>0?b.top-e:Math.max(b.top-c.collisionPosition.top,b.top)}},flip:{left:function(b,c){if(c.at[0]===e)return;var d=a(window),f=c.collisionPosition.left+c.collisionWidth-d.width()-d.scrollLeft(),g=c.my[0]==="left"?-c.elemWidth:c.my[0]==="right"?c.elemWidth:0,h=c.at[0]==="left"?c.targetWidth:-c.targetWidth,i=-2*c.offset[0];b.left+=c.collisionPosition.left<0?g+h+i:f>0?g+h+i:0},top:function(b,c){if(c.at[1]===e)return;var d=a(window),f=c.collisionPosition.top+c.collisionHeight-d.height()-d.scrollTop(),g=c.my[1]==="top"?-c.elemHeight:c.my[1]==="bottom"?c.elemHeight:0,h=c.at[1]==="top"?c.targetHeight:-c.targetHeight,i=-2*c.offset[1];b.top+=c.collisionPosition.top<0?g+h+i:f>0?g+h+i:0}}},a.offset.setOffset||(a.offset.setOffset=function(b,c){/static/.test(a.curCSS(b,"position"))&&(b.style.position="relative");var d=a(b),e=d.offset(),f=parseInt(a.curCSS(b,"top",!0),10)||0,g=parseInt(a.curCSS(b,"left",!0),10)||0,h={top:c.top-e.top+f,left:c.left-e.left+g};"using"in c?c.using.call(b,h):d.css(h)},a.fn.offset=function(b){var c=this[0];return!c||!c.ownerDocument?null:b?a.isFunction(b)?this.each(function(c){a(this).offset(b.call(this,c,a(this).offset()))}):this.each(function(){a.offset.setOffset(this,b)}):h.call(this)}),a.curCSS||(a.curCSS=a.css),function(){var b=document.getElementsByTagName("body")[0],c=document.createElement("div"),d,e,g,h,i;d=document.createElement(b?"div":"body"),g={visibility:"hidden",width:0,height:0,border:0,margin:0,background:"none"},b&&a.extend(g,{position:"absolute",left:"-1000px",top:"-1000px"});for(var j in g)d.style[j]=g[j];d.appendChild(c),e=b||document.documentElement,e.insertBefore(d,e.firstChild),c.style.cssText="position: absolute; left: 10.7432222px; top: 10.432325px; height: 30px; width: 201px;",h=a(c).offset(function(a,b){return b}).offset(),d.innerHTML="",e.removeChild(d),i=h.top+h.left+(b?2e3:0),f.fractions=i>21&&i<22}()})(jQuery);;/*! jQuery UI - v1.8.24 - 2012-09-28
+* https://github.com/jquery/jquery-ui
+* Includes: jquery.ui.slider.js
+* Copyright (c) 2012 AUTHORS.txt; Licensed MIT, GPL */
+(function(a,b){var c=5;a.widget("ui.slider",a.ui.mouse,{widgetEventPrefix:"slide",options:{animate:!1,distance:0,max:100,min:0,orientation:"horizontal",range:!1,step:1,value:0,values:null},_create:function(){var b=this,d=this.options,e=this.element.find(".ui-slider-handle").addClass("ui-state-default ui-corner-all"),f="",g=d.values&&d.values.length||1,h=[];this._keySliding=!1,this._mouseSliding=!1,this._animateOff=!0,this._handleIndex=null,this._detectOrientation(),this._mouseInit(),this.element.addClass("ui-slider ui-slider-"+this.orientation+" ui-widget"+" ui-widget-content"+" ui-corner-all"+(d.disabled?" ui-slider-disabled ui-disabled":"")),this.range=a([]),d.range&&(d.range===!0&&(d.values||(d.values=[this._valueMin(),this._valueMin()]),d.values.length&&d.values.length!==2&&(d.values=[d.values[0],d.values[0]])),this.range=a("
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\ No newline at end of file
diff --git a/v3/js/jquery.jsPlumb-1.3.15-all-min.js b/v3/js/jquery.jsPlumb-1.3.15-all-min.js
new file mode 100644
index 000000000..3abdf47c9
--- /dev/null
+++ b/v3/js/jquery.jsPlumb-1.3.15-all-min.js
@@ -0,0 +1 @@
+jsPlumbUtil={isArray:function(b){return Object.prototype.toString.call(b)==="[object Array]"},isString:function(a){return typeof a==="string"},isBoolean:function(a){return typeof a==="boolean"},isObject:function(a){return Object.prototype.toString.call(a)==="[object Object]"},isDate:function(a){return Object.prototype.toString.call(a)==="[object Date]"},isFunction:function(a){return Object.prototype.toString.call(a)==="[object Function]"},clone:function(d){if(this.isString(d)){return new String(d)}else{if(this.isBoolean(d)){return new Boolean(d)}else{if(this.isDate(d)){return new Date(d.getTime())}else{if(this.isFunction(d)){return d}else{if(this.isArray(d)){var c=[];for(var e=0;eb[0]){return(a[1]>b[1])?2:1}else{return(a[1]>b[1])?3:4}},intersects:function(f,e){var c=f.x,a=f.x+f.w,k=f.y,h=f.y+f.h,d=e.x,b=e.x+e.w,i=e.y,g=e.y+e.h;return((c<=d&&d<=a)&&(k<=i&&i<=h))||((c<=b&&b<=a)&&(k<=i&&i<=h))||((c<=d&&d<=a)&&(k<=g&&g<=h))||((c<=b&&d<=a)&&(k<=g&&g<=h))||((d<=c&&c<=b)&&(i<=k&&k<=g))||((d<=a&&a<=b)&&(i<=k&&k<=g))||((d<=c&&c<=b)&&(i<=h&&h<=g))||((d<=a&&c<=b)&&(i<=h&&h<=g))},segmentMultipliers:[null,[1,-1],[1,1],[-1,1],[-1,-1]],inverseSegmentMultipliers:[null,[-1,-1],[-1,1],[1,1],[1,-1]],pointOnLine:function(a,e,b){var d=jsPlumbUtil.gradient(a,e),i=jsPlumbUtil.segment(a,e),h=b>0?jsPlumbUtil.segmentMultipliers[i]:jsPlumbUtil.inverseSegmentMultipliers[i],c=Math.atan(d),f=Math.abs(b*Math.sin(c))*h[1],g=Math.abs(b*Math.cos(c))*h[0];return{x:a.x+g,y:a.y+f}},perpendicularLineTo:function(c,d,e){var b=jsPlumbUtil.gradient(c,d),f=Math.atan(-1/b),g=e/2*Math.sin(f),a=e/2*Math.cos(f);return[{x:d.x+a,y:d.y+g},{x:d.x-a,y:d.y-g}]},findWithFunction:function(b,d){if(b){for(var c=0;c-1){c.splice(b,1)}return b!=-1},remove:function(b,c){var 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r=jsPlumb.CurrentLibrary,u=document.body,k=i.getId(m),t=r.getDOMElement(m),l=t.parentNode,o=l==u;e[k]=e[k]?e[k]+1:1;while(l!=u){var q=i.getId(l,null,true);if(q&&h[q]){var w=-1,s=r.getElementObject(l),n=r.getOffset(s);if(f[q][k]==null){var v=jsPlumb.CurrentLibrary.getOffset(m);f[q][k]={id:k,offset:{left:v.left-n.left,top:v.top-n.top}}}break}l=l.parentNode}};this.endpointDeleted=function(l){if(e[l.elementId]){e[l.elementId]--;if(e[l.elementId]<=0){for(var k in f){delete f[k][l.elementId]}}}};this.getElementsForDraggable=function(k){return f[k]};this.reset=function(){h={};g=[];f={};e={}}};if(!window.console){window.console={time:function(){},timeEnd:function(){},group:function(){},groupEnd:function(){},log:function(){}}}window.jsPlumbAdapter={headless:false,appendToRoot:function(e){document.body.appendChild(e)},getRenderModes:function(){return["canvas","svg","vml"]},isRenderModeAvailable:function(e){return{canvas:b,svg:a,vml:d()}[e]},getDragManager:function(e){return new c(e)},setRenderMode:function(i){var h;if(i){i=i.toLowerCase();var f=this.isRenderModeAvailable("canvas"),e=this.isRenderModeAvailable("svg"),g=this.isRenderModeAvailable("vml");if(i==="svg"){if(e){h="svg"}else{if(f){h="canvas"}else{if(g){h="vml"}}}}else{if(i==="canvas"&&f){h="canvas"}else{if(g){h="vml"}}}}return h}}})();(function(){var g=jsPlumbUtil.findWithFunction,G=jsPlumbUtil.indexOf,A=jsPlumbUtil.removeWithFunction,k=jsPlumbUtil.remove,r=jsPlumbUtil.addWithFunction,i=jsPlumbUtil.addToList,l=jsPlumbUtil.isArray,z=jsPlumbUtil.isString,u=jsPlumbUtil.isObject;var v=null,c=function(H,I){return n.CurrentLibrary.getAttribute(C(H),I)},d=function(I,J,H){n.CurrentLibrary.setAttribute(C(I),J,H)},y=function(I,H){n.CurrentLibrary.addClass(C(I),H)},h=function(I,H){return n.CurrentLibrary.hasClass(C(I),H)},m=function(I,H){n.CurrentLibrary.removeClass(C(I),H)},C=function(H){return n.CurrentLibrary.getElementObject(H)},s=function(I,H){var K=n.CurrentLibrary.getOffset(C(I));if(H!=null){var 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ae=U._jsPlumb.checkCondition("beforeDetach",ad);if(L){try{ae=L(ad)}catch(af){o("jsPlumb: beforeDetach callback failed",af)}}return ae};var O=aa.beforeDrop;this.isDropAllowed=function(ai,af,ag,ad,ae){var ah=U._jsPlumb.checkCondition("beforeDrop",{sourceId:ai,targetId:af,scope:ag,connection:ad,dropEndpoint:ae});if(O){try{ah=O({sourceId:ai,targetId:af,scope:ag,connection:ad,dropEndpoint:ae})}catch(aj){o("jsPlumb: beforeDrop callback failed",aj)}}return ah};var Y=function(){if(W&&ac){var ad={};n.extend(ad,W);n.extend(ad,ac);delete U.hoverPaintStyle;if(ad.gradient&&W.fillStyle){delete ad.gradient}ac=ad}};this.setPaintStyle=function(ad,ae){W=ad;U.paintStyleInUse=W;Y();if(!ae){U.repaint()}};this.getPaintStyle=function(){return W};this.setHoverPaintStyle=function(ad,ae){ac=ad;Y();if(!ae){U.repaint()}};this.getHoverPaintStyle=function(){return 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ag[bA]};this.appendElement=aX;var aU=false;this.isHoverSuspended=function(){return aU};this.setHoverSuspended=function(bz){aU=bz};var aY=function(bz){return function(){return jsPlumbAdapter.isRenderModeAvailable(bz)}};this.isCanvasAvailable=aY("canvas");this.isSVGAvailable=aY("svg");this.isVMLAvailable=aY("vml");this.hide=function(bz,bA){a7(bz,"none",bA)};this.idstamp=an;this.init=function(){if(!K){br.setRenderMode(br.Defaults.RenderMode);var bz=function(bA){n.CurrentLibrary.bind(document,bA,function(bG){if(!br.currentlyDragging&&Y==n.CANVAS){for(var bF in a0){var bH=a0[bF];for(var bD=0;bD=4)?[bE[2],bE[3]]:[0,0],offsets:(bE.length==6)?[bE[4],bE[5]]:[0,0],elementId:bB};bC=new ab(bD);bC.clone=function(){return new ab(bD)}}}}}if(!bC.id){bC.id="anchor_"+an()}return bC};this.makeAnchors=function(bC,bA,bz){var bD=[];for(var bB=0;bB0&&bT>=at[bM]){if(bz){bz({element:bO,connection:bY},bR)}return false}bQ.anchor.locked=false;if(b1){bH.setDragScope(b3,b1)}var bW=proxyComponent.isDropAllowed(bY.sourceId,H(bO),bY.scope,bY,null);if(bY.endpointsToDeleteOnDetach){if(bQ===bY.endpointsToDeleteOnDetach[0]){bY.endpointsToDeleteOnDetach[0]=null}else{if(bQ===bY.endpointsToDeleteOnDetach[1]){bY.endpointsToDeleteOnDetach[1]=null}}}if(bY.suspendedEndpoint){bY.targetId=bY.suspendedEndpoint.elementId;bY.target=bH.getElementObject(bY.suspendedEndpoint.elementId);bY.endpoints[1]=bY.suspendedEndpoint}if(bW){bQ.detach(bY,false,true,false);var b2=aK[bM]||br.addEndpoint(bO,bA);if(bA.uniqueEndpoint){aK[bM]=b2}b2._makeTargetCreator=true;if(b2.anchor.positionFinder!=null){var bZ=bH.getUIPosition(arguments,br.getZoom()),bV=s(bO,br),b0=a(bO),bU=b2.anchor.positionFinder(bZ,bV,b0,b2.anchor.constructorParams);b2.anchor.x=bU[0];b2.anchor.y=bU[1]}var bX=br.connect({source:bQ,target:b2,scope:b1,previousConnection:bY,container:bY.parent,deleteEndpointsOnDetach:bE,doNotFireConnectionEvent:bQ.endpointWillMoveAfterConnection});if(bY.endpoints[1]._makeTargetCreator&&bY.endpoints[1].connections.length<2){br.deleteEndpoint(bY.endpoints[1])}if(bE){bX.endpointsToDeleteOnDetach=[bQ,b2]}bX.repaint()}else{if(bY.suspendedEndpoint){if(bY.isReattach()){bY.setHover(false);bY.floatingAnchorIndex=null;bY.suspendedEndpoint.addConnection(bY);br.repaint(bQ.elementId)}else{bQ.detach(bY,false,true,true,bR)}}}};var bN=bH.dragEvents.drop;bL.scope=bL.scope||bI;bL[bN]=ap(bL[bN],bK);bH.initDroppable(bO,bL,true)};bC=aL(bC);var bG=bC.length&&bC.constructor!=String?bC:[bC];for(var bF=0;bF=0&&bX>=N[bJ]){if(bA){bA({element:bQ,maxConnections:bC},bZ)}return false}if(bE.filter){var bV=bE.filter(bH.getOriginalEvent(bZ),bQ);if(bV===false){return}}var b3=X({elId:bK});var b2=((bZ.pageX||bZ.page.x)-b3.left)/b3.width,b1=((bZ.pageY||bZ.page.y)-b3.top)/b3.height,b7=b2,b6=b1;if(bB.parent){var b0=bH.getElementObject(bB.parent),bY=H(b0);b3=X({elId:bY});b7=((bZ.pageX||bZ.page.x)-b3.left)/b3.width,b6=((bZ.pageY||bZ.page.y)-b3.top)/b3.height}var b5={};n.extend(b5,bB);b5.isSource=true;b5.anchor=[b2,b1,0,0];b5.parentAnchor=[b7,b6,0,0];b5.dragOptions=bS;if(bB.parent){var bW=b5.container||br.Defaults.Container||n.Defaults.Container;if(bW){b5.container=bW}else{b5.container=n.CurrentLibrary.getParent(bB.parent)}}bU=br.addEndpoint(bK,b5);bO=true;bU.endpointWillMoveAfterConnection=bB.parent!=null;bU.endpointWillMoveTo=bB.parent?bH.getElementObject(bB.parent):null;var b4=function(){if(bO){br.deleteEndpoint(bU)}};br.registerListener(bU.canvas,"mouseup",b4);br.registerListener(bQ,"mouseup",b4);bH.trigger(bU.canvas,"mousedown",bZ)};br.registerListener(bQ,"mousedown",bM);J[bK]=bM};bD=aL(bD);var bG=bD.length&&bD.constructor!=String?bD:[bD];for(var bF=0;bF0?bJ[0]:null,bE=bJ.length>0?0:-1,bI=this,bD=function(bM,bK,bQ,bP,bL){var bO=bP[0]+(bM.x*bL[0]),bN=bP[1]+(bM.y*bL[1]);return Math.sqrt(Math.pow(bK-bO,2)+Math.pow(bQ-bN,2))},bz=bA||function(bU,bL,bM,bN,bK){var bP=bM[0]+(bN[0]/2),bO=bM[1]+(bN[1]/2);var bR=-1,bT=Infinity;for(var bQ=0;bQ=bC.left)||(bF.left<=bC.right&&bF.right>=bC.right)||(bF.left<=bC.left&&bF.right>=bC.right)||(bC.left<=bF.left&&bC.right>=bF.right)),bK=((bF.top<=bC.top&&bF.bottom>=bC.top)||(bF.top<=bC.bottom&&bF.bottom>=bC.bottom)||(bF.top<=bC.top&&bF.bottom>=bC.bottom)||(bC.top<=bF.top&&bC.bottom>=bF.bottom));if(!(bE||bK)){var bH=null,bB=false,bz=false,bG=null;if(bC.left>bF.left&&bC.top>bF.top){bH=["right","top"]}else{if(bC.left>bF.left&&bF.top>bC.top){bH=["top","left"]}else{if(bC.leftbF.top){bH=["left","top"]}}}}return{orientation:U.DIAGONAL,a:bH,theta:bA,theta2:bD}}else{if(bE){return{orientation:U.HORIZONTAL,a:bF.topbz[0]?1:-1},aa=function(bz){return function(bB,bA){var bC=true;if(bz){if(bB[0][0]bA[0][1]}}else{if(bB[0][0]>bA[0][0]){bC=true}else{bC=bB[0][1]>bA[0][1]}}return bC===false?-1:1}},M=function(bA,bz){var bC=bA[0][0]<0?-Math.PI-bA[0][0]:Math.PI-bA[0][0],bB=bz[0][0]<0?-Math.PI-bz[0][0]:Math.PI-bz[0][0];if(bC>bB){return 1}else{return bA[0][1]>bz[0][1]?1:-1}},a2={top:bb,right:aa(true),bottom:aa(true),left:M},ar=function(bz,bA){return bz.sort(bA)},ao=function(bA,bz){var bC=ag[bA],bD=aj[bA],bB=function(bK,bR,bG,bJ,bP,bO,bF){if(bJ.length>0){var bN=ar(bJ,a2[bK]),bL=bK==="right"||bK==="top",bE=a5(bK,bR,bG,bN,bP,bO,bL);var bS=function(bV,bU){var bT=bs([bU[0],bU[1]],bV.canvas);ak[bV.id]=[bT[0],bT[1],bU[2],bU[3]];aM[bV.id]=bF};for(var bH=0;bH0){bS.connections[0].setHover(b7,false)}else{bS.setHover(b7)}};D(bS.endpoint,bS,b6);this.setPaintStyle(b5.paintStyle||b5.style||br.Defaults.EndpointStyle||n.Defaults.EndpointStyle,true);this.setHoverPaintStyle(b5.hoverPaintStyle||br.Defaults.EndpointHoverStyle||n.Defaults.EndpointHoverStyle,true);this.paintStyleInUse=this.getPaintStyle();var bN=this.getPaintStyle();this.connectorStyle=b5.connectorStyle;this.connectorHoverStyle=b5.connectorHoverStyle;this.connectorOverlays=b5.connectorOverlays;this.connector=b5.connector;this.connectorTooltip=b5.connectorTooltip;this.connectorClass=b5.connectorClass;this.connectorHoverClass=b5.connectorHoverClass;this.isSource=b5.isSource||false;this.isTarget=b5.isTarget||false;var bY=b5.maxConnections||br.Defaults.MaxConnections;this.getAttachedElements=function(){return bS.connections};this.canvas=this.endpoint.canvas;this.connections=b5.connections||[];this.scope=b5.scope||R;this.connectionType=b5.connectionType;this.timestamp=null;bS.reattachConnections=b5.reattach||br.Defaults.ReattachConnections;bS.connectionsDetachable=br.Defaults.ConnectionsDetachable;if(b5.connectionsDetachable===false||b5.detachable===false){bS.connectionsDetachable=false}var bM=b5.dragAllowedWhenFull||true;if(b5.onMaxConnections){bS.bind("maxConnections",b5.onMaxConnections)}this.computeAnchor=function(b7){return bS.anchor.compute(b7)};this.addConnection=function(b7){bS.connections.push(b7)};this.detach=function(b8,cd,b9,cg,b7){var cf=g(bS.connections,function(ci){return ci.id==b8.id}),ce=false;cg=(cg!==false);if(cf>=0){if(b9||b8._forceDetach||b8.isDetachable()||b8.isDetachAllowed(b8)){var ch=b8.endpoints[0]==bS?b8.endpoints[1]:b8.endpoints[0];if(b9||b8._forceDetach||(bS.isDetachAllowed(b8))){bS.connections.splice(cf,1);if(!cd){ch.detach(b8,true,b9);if(b8.endpointsToDeleteOnDetach){for(var cc=0;cc0){bS.detach(bS.connections[0],false,true,b8,b7)}};this.detachFrom=function(ca,b9,b7){var cb=[];for(var b8=0;b8=0){bS.connections.splice(b7,1)}};this.getElement=function(){return bR};this.setElement=function(ca,b7){var cc=H(ca);A(aV[bS.elementId],function(cd){return cd.id==bS.id});bR=C(ca);bJ=H(bR);bS.elementId=bJ;var cb=ay({source:cc,container:b7}),b9=bD.getParent(bS.canvas);bD.removeElement(bS.canvas,b9);bD.appendElement(bS.canvas,cb);for(var b8=0;b80){var cj=bO(ca.elementWithPrecedence),cl=cj.endpoints[0]==bS?1:0,cc=cl==0?cj.sourceId:cj.targetId,ci=aj[cc],ck=ag[cc];b9.txy=[ci.left,ci.top];b9.twh=ck;b9.tElement=cj.endpoints[cl]}cd=bS.anchor.compute(b9)}var ch=bP.compute(cd,bS.anchor.getOrientation(bS),bS.paintStyleInUse,cb||bS.paintStyleInUse);bP.paint(ch,bS.paintStyleInUse,bS.anchor);bS.timestamp=cg;for(var ce=0;ce0?u:n+u:u*n;return jsPlumbUtil.pointOnLine({x:i,y:h},{x:e,y:d},t)}}};this.gradientAtPoint=function(t){return f};this.pointAlongPathFrom=function(t,x,w){var v=s.pointOnPath(t,w),u=t==1?{x:i+((e-i)*10),y:h+((h-d)*10)}:{x:e,y:d};return jsPlumbUtil.pointOnLine(v,u,x)}};jsPlumb.Connectors.Bezier=function(w){var q=this;w=w||{};this.majorAnchor=w.curviness||150;this.minorAnchor=10;var u=null;this.type="Bezier";this._findControlPoint=function(I,x,D,y,B,G,z){var F=G.getOrientation(y),H=z.getOrientation(B),C=F[0]!=H[0]||F[1]==H[1],A=[],J=q.majorAnchor,E=q.minorAnchor;if(!C){if(F[0]==0){A.push(x[0]v){v=D}if(G<0){t+=G;var I=Math.abs(G);v+=I;r[0]+=I;g+=I;p+=I;m[0]+=I}var Q=Math.min(f,o),O=Math.min(r[1],m[1]),C=Math.min(Q,O),H=Math.max(f,o),F=Math.max(r[1],m[1]),z=Math.max(H,F);if(z>e){e=z}if(C<0){s+=C;var 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aA=ab+((1-ay.y)*at.height)+Math.max(i,o);return[[ac,aA],[O,aA]]}else{if(Y&&(I==1||I==2)){return[[ak,K],[ak,au]]}else{return[[ac,ai],[O,ai]]}}},orthogonalx:function(){if(I==1||I==2){return[[O,ab]]}else{return[[ac,M]]}},perpendicularx:function(){var aA=(au+K)/2;if((I==1&&az[1]==1)||(I==2&&az[1]==-1)){if(Math.abs(av-L)>Math.max(i,o)){return[[O,ab]]}else{return[[ac,ab],[ac,aA],[O,aA]]}}else{if((I==3&&az[1]==-1)||(I==4&&az[1]==1)){return[[ac,aA],[O,aA]]}else{if((I==3&&az[1]==1)||(I==4&&az[1]==-1)){return[[ac,M]]}else{if((I==1&&az[1]==-1)||(I==2&&az[1]==1)){if(Math.abs(av-L)>Math.max(i,o)){return[[ak,ab],[ak,M]]}else{return[[ac,M]]}}}}}},oppositey:function(){if(C.elementId==T.elementId){var aA=ac+((1-ay.x)*at.width)+Math.max(i,o);return[[aA,ab],[aA,M]]}else{if(aa&&(I==2||I==3)){return[[L,ai],[av,ai]]}else{return[[ak,ab],[ak,M]]}}},orthogonaly:function(){if(I==2||I==3){return[[ac,M]]}else{return[[O,ab]]}},perpendiculary:function(){var aA=(av+L)/2;if((I==2&&az[0]==-1)||(I==3&&az[0]==1)){if(Math.abs(av-L)>Math.max(i,o)){return[[ac,M]]}else{return[[ac,ai],[O,ai]]}}else{if((I==1&&az[0]==-1)||(I==4&&az[0]==1)){var aA=(av+L)/2;return[[aA,ab],[aA,M]]}else{if((I==1&&az[0]==1)||(I==4&&az[0]==-1)){return[[O,ab]]}else{if((I==2&&az[0]==1)||(I==3&&az[0]==-1)){if(Math.abs(au-K)>Math.max(i,o)){return[[ac,ai],[O,ai]]}else{return[[O,ab]]}}}}}}};var aq=J[P+V]();if(aq){for(var aw=0;awv[3]){v[3]=w+(X*2)}if(y>v[2]){v[2]=y+(X*2)}return v};this.pointOnPath=function(C,D){return r.pointAlongPathFrom(C,0,D)};this.gradientAtPoint=function(C,D){return u[h(C,D)["index"]][4]};this.pointAlongPathFrom=function(J,C,I){var K=h(J,I),G=K.segment,D=K.proportion,F=u[K.index][5],E=u[K.index][4];var H={x:E==Infinity?G[2]:G[2]>G[0]?G[0]+((1-D)*F)-C:G[2]+(D*F)+C,y:E==0?G[3]:G[3]>G[1]?G[1]+((1-D)*F)-C:G[3]+(D*F)+C,segmentInfo:K};return H}};jsPlumb.Endpoints.Dot=function(e){this.type="Dot";var d=this;e=e||{};this.radius=e.radius||10;this.defaultOffset=0.5*this.radius;this.defaultInnerRadius=this.radius/3;this.compute=function(k,g,m,i){var h=m.radius||d.radius,f=k[0]-h,l=k[1]-h;return[f,l,h*2,h*2,h]}};jsPlumb.Endpoints.Rectangle=function(e){this.type="Rectangle";var d=this;e=e||{};this.width=e.width||20;this.height=e.height||20;this.compute=function(l,h,n,k){var i=n.width||d.width,g=n.height||d.height,f=l[0]-(i/2),m=l[1]-(g/2);return[f,m,i,g]}};var b=function(f){jsPlumb.DOMElementComponent.apply(this,arguments);var d=this;var e=[];this.getDisplayElements=function(){return e};this.appendDisplayElement=function(g){e.push(g)}};jsPlumb.Endpoints.Image=function(i){this.type="Image";b.apply(this,arguments);var n=this,h=false,g=false,f=i.width,e=i.height,l=null,d=i.endpoint;this.img=new Image();n.ready=false;this.img.onload=function(){n.ready=true;f=f||n.img.width;e=e||n.img.height;if(l){l(n)}};d.setImage=function(o,q){var p=o.constructor==String?o:o.src;l=q;n.img.src=o;if(n.canvas!=null){n.canvas.setAttribute("src",o)}};d.setImage(i.src||i.url,i.onload);this.compute=function(q,o,r,p){n.anchorPoint=q;if(n.ready){return[q[0]-f/2,q[1]-e/2,f,e]}else{return[0,0,0,0]}};n.canvas=document.createElement("img"),h=false;n.canvas.style.margin=0;n.canvas.style.padding=0;n.canvas.style.outline=0;n.canvas.style.position="absolute";var k=i.cssClass?" 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p,u=C[0].y-C[B].y;y=C[B].x-C[0].x;q=C[0].x*C[B].y-C[B].x*C[0].y;s=max_distance_below=0;for(p=1;ps?s=r:r0?1:-1,r=null;n1){l.location=1}if(l.location<0){l.location=0}return i(m,l.location)},nearestPointOnCurve:function(m,l){var n=h(m,l);return{point:k(l,l.length-1,n.location,null,null),location:n.location}},pointOnCurve:c,pointAlongCurveFrom:function(m,l,n){return b(m,l,n).point},perpendicularToCurveAt:function(m,l,n,o){l=b(m,l,o==null?0:o);m=i(m,l.location);o=Math.atan(-1/m);m=n/2*Math.sin(o);n=n/2*Math.cos(o);return[{x:l.point.x+n,y:l.point.y+m},{x:l.point.x-n,y:l.point.y-m}]},locationAlongCurveFrom:function(m,l,n){return b(m,l,n).location}}})();
\ No newline at end of file
diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 9bfa9f887..117c5ad32 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -1726,8 +1726,8 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
   // render all global variables IN THE ORDER they were created by the program,
   // in order to ensure continuity:
 
-  // Derive a list where each element contains a pair of
-  // [varname, value] as long as value is NOT undefined.
+  // Derive a list where each element contains varname
+  // as long as value is NOT undefined.
   // (Sometimes entries in curEntry.ordered_globals are undefined,
   // so filter those out.)
   var realGlobalsLst = [];
@@ -1736,41 +1736,43 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
     // (use '!==' to do an EXACT match against undefined)
     if (val !== undefined) { // might not be defined at this line, which is OKAY!
-      realGlobalsLst.push([varname, varname]); /* purposely map varname down both columns */
+      realGlobalsLst.push(varname);
     }
   });
 
   var globalsID = myViz.generateID('globals');
   var globalTblID = myViz.generateID('global_table');
 
-  var globalsD3 = myViz.domRootD3.select('#' + globalTblID)
+  var globalVarTable = myViz.domRootD3.select('#' + globalTblID)
     .selectAll('tr')
-    .data(realGlobalsLst, function(d) {
-      return d[0]; // use variable name as key
-    });
-    
+    .data(realGlobalsLst,
+          function(d) {return d;} // use variable name as key
+    );
 
-  // ENTER
-  globalsD3.enter()
-    .append('tr')
-    .selectAll('td.stackFrameVar,td.stackFrameValue')
-    .data(function(d, i){return d;}) /* map varname down both columns */
+  globalVarTable
     .enter()
+    .append('tr');
+
+
+  var globalVarTableCells = globalVarTable
+    .selectAll('td.stackFrameVar,td.stackFrameValue')
+    .data(function(d, i){return [d, d];}) /* map varname down both columns */
+
+  globalVarTableCells.enter()
     .append('td')
-    .attr('class', function(d, i) {return (i == 0) ? 'stackFrameVar' : 'stackFrameValue';})
-    .html(function(d, i) {
-      return (i == 0) ? d : '' /* initialize in each() later */;
-    })
+    .attr('class', function(d, i) {return (i == 0) ? 'stackFrameVar' : 'stackFrameValue';});
+
   // remember that the enter selection is added to the update
   // selection so that we can process it later ...
 
   // UPDATE
-  globalsD3
+  globalVarTableCells
     .order() // VERY IMPORTANT to put in the order corresponding to data elements
-    .selectAll('td')
-    .data(function(d, i){return d;}) /* map varname down both columns */
     .each(function(varname, i) {
-      if (i == 1) {
+      if (i == 0) {
+        $(this).html(varname);
+      }
+      else {
         var val = curEntry.globals[varname];
 
         // include type in repr to prevent conflating integer 5 with string "5"
@@ -1818,8 +1820,16 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
     });
 
-  // EXIT
-  globalsD3.exit()
+
+  globalVarTableCells.exit().remove();
+
+  globalVarTable.exit()
+    .each(function(d, i) {
+      // detach all stack_pointer connectors for divs that are being removed
+      $(this).find('.stack_pointer').each(function(i, sp) {
+        myViz.jsPlumbInstance.detachAllConnections($(sp).attr('id'));
+      });
+    })
     .remove();
 
 
@@ -1902,11 +1912,11 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   var stackVarTableCells = stackVarTable
     .selectAll('td.stackFrameVar,td.stackFrameValue')
-    .data(function(d, i) {return [d, d] /* map identical data down both columns */;})
+    .data(function(d, i) {return [d, d] /* map identical data down both columns */;});
 
   stackVarTableCells.enter()
     .append('td')
-    .attr('class', function(d, i) {return (i == 0) ? 'stackFrameVar' : 'stackFrameValue';})
+    .attr('class', function(d, i) {return (i == 0) ? 'stackFrameVar' : 'stackFrameValue';});
 
   stackVarTableCells
     .order() // VERY IMPORTANT to put in the order corresponding to data elements
@@ -1971,10 +1981,22 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   stackVarTableCells.exit().remove();
 
-  stackVarTable.exit().remove();
+  stackVarTable.exit()
+    .each(function(d, i) {
+      $(this).find('.stack_pointer').each(function(i, sp) {
+        // detach all stack_pointer connectors for divs that are being removed
+        myViz.jsPlumbInstance.detachAllConnections($(sp).attr('id'));
+      });
+    })
+    .remove();
 
   stackFrameDiv.exit()
-    //.each(function(frame, i) {console.log('DEL STACK FRAME', frame.unique_hash, i);})
+    .each(function(frame, i) {
+      $(this).find('.stack_pointer').each(function(i, sp) {
+        // detach all stack_pointer connectors for divs that are being removed
+        myViz.jsPlumbInstance.detachAllConnections($(sp).attr('id'));
+      });
+    })
     .remove();
 
 

From 8c2a2f2b955a040b3b40db0fbaf2072b7fa5d660 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 4 Oct 2012 16:59:51 -0700
Subject: [PATCH 457/502] upgraded from jquery 1.6 to 1.8.2 (fingers crossed!)

---
 v3/commentary-bubbles-demo.html | 9 +++++----
 v3/embedding-demo.html          | 9 +++++----
 v3/index.html                   | 9 +++++----
 v3/js/pytutor.js                | 9 +++++----
 v3/visualize.html               | 9 +++++----
 5 files changed, 25 insertions(+), 20 deletions(-)

diff --git a/v3/commentary-bubbles-demo.html b/v3/commentary-bubbles-demo.html
index 541dcddb5..14ecc7583 100644
--- a/v3/commentary-bubbles-demo.html
+++ b/v3/commentary-bubbles-demo.html
@@ -6,11 +6,12 @@
 
 
 
-
+
  
- 
- 
-
+ 
+ 
+
 
 
 
diff --git a/v3/embedding-demo.html b/v3/embedding-demo.html
index bb89143d5..3d4f385b3 100644
--- a/v3/embedding-demo.html
+++ b/v3/embedding-demo.html
@@ -6,11 +6,12 @@
 
 
 
-
+
  
- 
- 
-
+ 
+ 
+
 
 
 
diff --git a/v3/index.html b/v3/index.html
index ed6ce82ed..632afe8e5 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -36,11 +36,12 @@
 
 
 
-
+
  
- 
- 
-
+ 
+ 
+
 
 
 
diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 117c5ad32..4c27b63fc 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -31,11 +31,12 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 
 
-
+
  
- 
- 
-
+ 
+ 
+
 
 
 
diff --git a/v3/visualize.html b/v3/visualize.html
index 3f5f27863..6279ecb10 100644
--- a/v3/visualize.html
+++ b/v3/visualize.html
@@ -34,11 +34,12 @@
 
 
 
-
+
  
- 
- 
-
+ 
+ 
+
 
 
 

From ace8b32ffc9cfede38a1759eb27fac3004b1762b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 5 Oct 2012 11:40:25 -0700
Subject: [PATCH 458/502] started playing around with qTip2 for commentary
 bubbles

---
 v3/commentary-bubbles-demo.html |   7 +-
 v3/commentary-bubbles-demo.js   |  26 +-
 v3/css/jquery.qtip.css          | 573 ++++++++++++++++++++++++++++++++
 v3/js/jquery.qtip.min.js        |   2 +
 4 files changed, 603 insertions(+), 5 deletions(-)
 create mode 100644 v3/css/jquery.qtip.css
 create mode 100644 v3/js/jquery.qtip.min.js

diff --git a/v3/commentary-bubbles-demo.html b/v3/commentary-bubbles-demo.html
index 14ecc7583..c75a213c5 100644
--- a/v3/commentary-bubbles-demo.html
+++ b/v3/commentary-bubbles-demo.html
@@ -19,11 +19,12 @@
 
 
 
-
+
+
+
 
 
+
 
 
 
diff --git a/v3/commentary-bubbles-demo.js b/v3/commentary-bubbles-demo.js
index 3d9f69712..e7a8daf21 100644
--- a/v3/commentary-bubbles-demo.js
+++ b/v3/commentary-bubbles-demo.js
@@ -4,10 +4,32 @@
 var listSumTrace = {"code": "def listSum(numbers):\n  if not numbers:\n    return 0\n  else:\n    (f, rest) = numbers\n    return f + listSum(rest)\n\nmyList = (1, (2, (3, None)))\ntotal = listSum(myList)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 1, "event": "step_line"}, {"ordered_globals": ["listSum"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null]}, "line": 8, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 9, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 1, "event": "call"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 1, "event": "call"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 1, "event": "call"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 5, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4], "rest": null, "f": 3}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4], "rest": null, "f": 3}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 4, "encoded_locals": {"numbers": null}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f4", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 1, "event": "call"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", 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"listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 2, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4], "rest": null, "f": 3}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 4, "encoded_locals": {"numbers": null}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f4", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4], "rest": null, "f": 3}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 4, "encoded_locals": {"__return__": 0, "numbers": null}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f4", "ordered_varnames": ["numbers", "__return__"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 3, "event": "return"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"__return__": 3, "numbers": ["REF", 4], "rest": null, "f": 3}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest", "__return__"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "return"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"__return__": 5, "numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest", "__return__"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "return"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"__return__": 6, "numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest", "__return__"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "return"}, {"ordered_globals": ["listSum", "myList", "total"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"total": 6, "myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 9, "event": "return"}]};
 
 
-/*
 $(document).ready(function() {
+  /*
   var listSumVisualizer = new ExecutionVisualizer('listSumDiv', listSumTrace,
                                                   {embeddedMode: false,
                                                    editCodeBaseURL: 'http://pythontutor.com/visualize.html'});
+  */
+
+  $('#v1__heap_object_4').qtip({
+    content: 'This is the final element of our linked list. Its car is 3 and cdr is None',
+    id: 'v1__heap_object_4',
+    position: {
+      my: 'bottom left',
+      at: 'top center',
+      adjust: {x: 0, y: 0},
+    },
+    show: {
+      ready: true, // show on document.ready instead of on mouseenter
+      //delay: 0,
+      event: null,
+    },
+    hide: {
+      fixed: true,
+      event: null,
+    },
+    style: {
+      classes: 'ui-tooltip-bootstrap',
+    },
+  });
 });
-*/
diff --git a/v3/css/jquery.qtip.css b/v3/css/jquery.qtip.css
new file mode 100644
index 000000000..fb7fe24b6
--- /dev/null
+++ b/v3/css/jquery.qtip.css
@@ -0,0 +1,573 @@
+/*! qTip2 - Pretty powerful tooltips - v2.0.0 - 2012-09-10
+* http://craigsworks.com/projects/qtip2/
+* Copyright (c) 2012 Craig Michael Thompson; Licensed MIT, GPL */
+
+/* Fluid class for determining actual width in IE */
+#qtip-rcontainer{
+	position: absolute;
+	left: -28000px;
+	top: -28000px;
+	display: block;
+	visibility: hidden;
+}
+
+	/* Fluid class for determining actual width in IE */
+	#qtip-rcontainer .ui-tooltip{
+		display: block !important;
+		visibility: hidden !important;
+		position: static !important;
+		float: left !important;
+	}
+
+/* Core qTip styles */
+.ui-tooltip, .qtip{
+	position: absolute;
+	left: -28000px;
+	top: -28000px;
+	display: none;
+
+	max-width: 280px;
+	min-width: 50px;
+	
+	font-size: 10.5px;
+	line-height: 12px;
+}
+
+	.ui-tooltip-content{
+		position: relative;
+		padding: 5px 9px;
+		overflow: hidden;
+
+		text-align: left;
+		word-wrap: break-word;
+	}
+
+	.ui-tooltip-titlebar{
+		position: relative;
+		min-height: 14px;
+		padding: 5px 35px 5px 10px;
+		overflow: hidden;
+
+		border-width: 0 0 1px;
+		font-weight: bold;
+	}
+
+	.ui-tooltip-titlebar + .ui-tooltip-content{ border-top-width: 0 !important; }
+
+		/* Default close button class */
+		.ui-tooltip-titlebar .ui-state-default{
+			position: absolute;
+			right: 4px;
+			top: 50%;
+			margin-top: -9px;
+
+			cursor: pointer;
+			outline: medium none;
+
+			border-width: 1px;
+			border-style: solid;
+		}
+		
+		* html .ui-tooltip-titlebar .ui-state-default{ top: 16px; } /* IE fix */
+
+		.ui-tooltip-titlebar .ui-icon,
+		.ui-tooltip-icon .ui-icon{
+			display: block;
+			text-indent: -1000em;
+			direction: ltr;
+		}
+
+		.ui-tooltip-icon, .ui-tooltip-icon .ui-icon{
+			-moz-border-radius: 3px;
+			-webkit-border-radius: 3px;
+			border-radius: 3px;
+			text-decoration: none;
+		}
+
+			.ui-tooltip-icon .ui-icon{
+				width: 18px;
+				height: 14px;
+
+				text-align: center;
+				text-indent: 0;
+				font: normal bold 10px/13px Tahoma,sans-serif;
+
+				color: inherit;
+				background: transparent none no-repeat -100em -100em;
+			}
+
+
+/* Applied to 'focused' tooltips e.g. most recently displayed/interacted with */
+.ui-tooltip-focus{}
+
+/* Applied on hover of tooltips i.e. added/removed on mouseenter/mouseleave respectively */
+.ui-tooltip-hover{}
+
+/* Default tooltip style */
+.ui-tooltip-default{
+	border-width: 1px;
+	border-style: solid;
+	border-color: #F1D031;
+
+	background-color: #FFFFA3;
+	color: #555;
+}
+
+	.ui-tooltip-default .ui-tooltip-titlebar{
+		background-color: #FFEF93;
+	}
+
+	.ui-tooltip-default .ui-tooltip-icon{
+		border-color: #CCC;
+		background: #F1F1F1;
+		color: #777;
+	}
+	
+	.ui-tooltip-default .ui-tooltip-titlebar .ui-state-hover{
+		border-color: #AAA;
+		color: #111;
+	}
+
+
+/*! Light tooltip style */
+.ui-tooltip-light{
+	background-color: white;
+	border-color: #E2E2E2;
+	color: #454545;
+}
+
+	.ui-tooltip-light .ui-tooltip-titlebar{
+		background-color: #f1f1f1;
+	}
+
+
+/*! Dark tooltip style */
+.ui-tooltip-dark{
+	background-color: #505050;
+	border-color: #303030;
+	color: #f3f3f3;
+}
+
+	.ui-tooltip-dark .ui-tooltip-titlebar{
+		background-color: #404040;
+	}
+
+	.ui-tooltip-dark .ui-tooltip-icon{
+		border-color: #444;
+	}
+
+	.ui-tooltip-dark .ui-tooltip-titlebar .ui-state-hover{
+		border-color: #303030;
+	}
+
+
+/*! Cream tooltip style */
+.ui-tooltip-cream{
+	background-color: #FBF7AA;
+	border-color: #F9E98E;
+	color: #A27D35;
+}
+
+	.ui-tooltip-cream .ui-tooltip-titlebar{
+		background-color: #F0DE7D;
+	}
+
+	.ui-tooltip-cream .ui-state-default .ui-tooltip-icon{
+		background-position: -82px 0;
+	}
+
+
+/*! Red tooltip style */
+.ui-tooltip-red{
+	background-color: #F78B83;
+	border-color: #D95252;
+	color: #912323;
+}
+
+	.ui-tooltip-red .ui-tooltip-titlebar{
+		background-color: #F06D65;
+	}
+
+	.ui-tooltip-red .ui-state-default .ui-tooltip-icon{
+		background-position: -102px 0;
+	}
+
+	.ui-tooltip-red .ui-tooltip-icon{
+		border-color: #D95252;
+	}
+
+	.ui-tooltip-red .ui-tooltip-titlebar .ui-state-hover{
+		border-color: #D95252;
+	}
+
+
+/*! Green tooltip style */
+.ui-tooltip-green{
+	background-color: #CAED9E;
+	border-color: #90D93F;
+	color: #3F6219;
+}
+
+	.ui-tooltip-green .ui-tooltip-titlebar{
+		background-color: #B0DE78;
+	}
+
+	.ui-tooltip-green .ui-state-default .ui-tooltip-icon{
+		background-position: -42px 0;
+	}
+
+
+/*! Blue tooltip style */
+.ui-tooltip-blue{
+	background-color: #E5F6FE;
+	border-color: #ADD9ED;
+	color: #5E99BD;
+}
+
+	.ui-tooltip-blue .ui-tooltip-titlebar{
+		background-color: #D0E9F5;
+	}
+
+	.ui-tooltip-blue .ui-state-default .ui-tooltip-icon{
+		background-position: -2px 0;
+	}
+
+
+/* Add shadows to your tooltips in: FF3+, Chrome 2+, Opera 10.6+, IE9+, Safari 2+ */
+.ui-tooltip-shadow{
+	-webkit-box-shadow: 1px 1px 3px 1px rgba(0, 0, 0, 0.15);
+	-moz-box-shadow: 1px 1px 3px 1px rgba(0, 0, 0, 0.15);
+	box-shadow: 1px 1px 3px 1px rgba(0, 0, 0, 0.15);
+}
+
+/* Add rounded corners to your tooltips in: FF3+, Chrome 2+, Opera 10.6+, IE9+, Safari 2+ */
+.ui-tooltip-rounded,
+.ui-tooltip-tipsy,
+.ui-tooltip-bootstrap{
+	-moz-border-radius: 5px;
+	-webkit-border-radius: 5px;
+	border-radius: 5px;
+}
+
+/* Youtube tooltip style */
+.ui-tooltip-youtube{
+	-moz-border-radius: 2px;
+	-webkit-border-radius: 2px;
+	border-radius: 2px;
+	
+	-webkit-box-shadow: 0 0 3px #333;
+	-moz-box-shadow: 0 0 3px #333;
+	box-shadow: 0 0 3px #333;
+
+	color: white;
+	border-width: 0;
+
+	background: #4A4A4A;
+	background-image: -webkit-gradient(linear,left top,left bottom,color-stop(0,#4A4A4A),color-stop(100%,black));
+	background-image: -webkit-linear-gradient(top,#4A4A4A 0,black 100%);
+	background-image: -moz-linear-gradient(top,#4A4A4A 0,black 100%);
+	background-image: -ms-linear-gradient(top,#4A4A4A 0,black 100%);
+	background-image: -o-linear-gradient(top,#4A4A4A 0,black 100%);
+}
+
+	.ui-tooltip-youtube .ui-tooltip-titlebar{
+		background-color: #4A4A4A;
+		background-color: rgba(0,0,0,0);
+	}
+	
+	.ui-tooltip-youtube .ui-tooltip-content{
+		padding: .75em;
+		font: 12px arial,sans-serif;
+		
+		filter: progid:DXImageTransform.Microsoft.Gradient(GradientType=0,StartColorStr=#4a4a4a,EndColorStr=#000000);
+		-ms-filter: "progid:DXImageTransform.Microsoft.Gradient(GradientType=0,StartColorStr=#4a4a4a,EndColorStr=#000000);";
+	}
+
+	.ui-tooltip-youtube .ui-tooltip-icon{
+		border-color: #222;
+	}
+
+	.ui-tooltip-youtube .ui-tooltip-titlebar .ui-state-hover{
+		border-color: #303030;
+	}
+
+
+/* jQuery TOOLS Tooltip style */
+.ui-tooltip-jtools{
+	background: #232323;
+	background: rgba(0, 0, 0, 0.7);
+	background-image: -webkit-gradient(linear, left top, left bottom, from(#717171), to(#232323));
+	background-image: -moz-linear-gradient(top, #717171, #232323);
+	background-image: -webkit-linear-gradient(top, #717171, #232323);
+	background-image: -ms-linear-gradient(top, #717171, #232323);
+	background-image: -o-linear-gradient(top, #717171, #232323);
+
+	border: 2px solid #ddd;
+	border: 2px solid rgba(241,241,241,1);
+
+	-moz-border-radius: 2px;
+	-webkit-border-radius: 2px;
+	border-radius: 2px;
+
+	-webkit-box-shadow: 0 0 12px #333;
+	-moz-box-shadow: 0 0 12px #333;
+	box-shadow: 0 0 12px #333;
+}
+
+	/* IE Specific */
+	.ui-tooltip-jtools .ui-tooltip-titlebar{
+		background-color: transparent;
+		filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#717171,endColorstr=#4A4A4A);
+		-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#717171,endColorstr=#4A4A4A)";
+	}
+	.ui-tooltip-jtools .ui-tooltip-content{
+		filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#4A4A4A,endColorstr=#232323);
+		-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#4A4A4A,endColorstr=#232323)";
+	}
+
+	.ui-tooltip-jtools .ui-tooltip-titlebar,
+	.ui-tooltip-jtools .ui-tooltip-content{
+		background: transparent;
+		color: white;
+		border: 0 dashed transparent;
+	}
+
+	.ui-tooltip-jtools .ui-tooltip-icon{
+		border-color: #555;
+	}
+
+	.ui-tooltip-jtools .ui-tooltip-titlebar .ui-state-hover{
+		border-color: #333;
+	}
+
+
+/* Cluetip style */
+.ui-tooltip-cluetip{
+	-webkit-box-shadow: 4px 4px 5px rgba(0, 0, 0, 0.4);
+	-moz-box-shadow: 4px 4px 5px rgba(0, 0, 0, 0.4);
+	box-shadow: 4px 4px 5px rgba(0, 0, 0, 0.4);
+
+	background-color: #D9D9C2;
+	color: #111;
+	border: 0 dashed transparent;
+}
+
+	.ui-tooltip-cluetip .ui-tooltip-titlebar{
+		background-color: #87876A;
+		color: white;
+		border: 0 dashed transparent;
+	}
+	
+	.ui-tooltip-cluetip .ui-tooltip-icon{
+		border-color: #808064;
+	}
+	
+	.ui-tooltip-cluetip .ui-tooltip-titlebar .ui-state-hover{
+		border-color: #696952;
+		color: #696952;
+	}
+
+
+/* Tipsy style */
+.ui-tooltip-tipsy{
+	background: black;
+	background: rgba(0, 0, 0, .87);
+
+	color: white;
+	border: 0 solid transparent;
+
+	font-size: 11px;
+	font-family: 'Lucida Grande', sans-serif;
+	font-weight: bold;
+	line-height: 16px;
+	text-shadow: 0 1px black;
+}
+
+	.ui-tooltip-tipsy .ui-tooltip-titlebar{
+		padding: 6px 35px 0 10;
+		background-color: transparent;
+	}
+
+	.ui-tooltip-tipsy .ui-tooltip-content{
+		padding: 6px 10;
+	}
+	
+	.ui-tooltip-tipsy .ui-tooltip-icon{
+		border-color: #222;
+		text-shadow: none;
+	}
+
+	.ui-tooltip-tipsy .ui-tooltip-titlebar .ui-state-hover{
+		border-color: #303030;
+	}
+
+
+/* Tipped style */
+.ui-tooltip-tipped{
+	border: 3px solid #959FA9;
+
+	-moz-border-radius: 3px;
+	-webkit-border-radius: 3px;
+	border-radius: 3px;
+
+	background-color: #F9F9F9;
+	color: #454545;
+
+	font-weight: normal;
+	font-family: serif;
+}
+
+	.ui-tooltip-tipped .ui-tooltip-titlebar{
+		border-bottom-width: 0;
+
+		color: white;
+		background: #3A79B8;
+		background-image: -webkit-gradient(linear, left top, left bottom, from(#3A79B8), to(#2E629D));
+		background-image: -webkit-linear-gradient(top, #3A79B8, #2E629D);
+		background-image: -moz-linear-gradient(top, #3A79B8, #2E629D);
+		background-image: -ms-linear-gradient(top, #3A79B8, #2E629D);
+		background-image: -o-linear-gradient(top, #3A79B8, #2E629D);
+		filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#3A79B8,endColorstr=#2E629D);
+		-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#3A79B8,endColorstr=#2E629D)";
+	}
+
+	.ui-tooltip-tipped .ui-tooltip-icon{
+		border: 2px solid #285589;
+		background: #285589;
+	}
+
+		.ui-tooltip-tipped .ui-tooltip-icon .ui-icon{
+			background-color: #FBFBFB;
+			color: #555;
+		}
+
+
+/**
+ * Twitter Bootstrap style.
+ *
+ * Tested with IE 8, IE 9, Chrome 18, Firefox 9, Opera 11.
+ * Does not work with IE 7.
+ */
+.ui-tooltip-bootstrap{
+	font-size: 13px;
+	line-height: 18px;
+
+	color: #333333;
+	background-color: #ffffff;
+
+
+	border: 1px solid #ccc;
+	border: 1px solid rgba(0, 0, 0, 0.2);
+
+	*border-right-width: 2px;
+	*border-bottom-width: 2px;
+
+	-webkit-border-radius: 5px;
+	-moz-border-radius: 5px;
+	border-radius: 5px;
+
+	-webkit-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
+	-moz-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
+	box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
+
+	-webkit-background-clip: padding-box;
+	-moz-background-clip: padding;
+	background-clip: padding-box;
+}
+
+	.ui-tooltip-bootstrap .ui-tooltip-titlebar{
+		font-size: 18px;
+		line-height: 22px;
+
+		border-bottom: 1px solid #ccc;
+		background-color: transparent;
+	}
+
+		.ui-tooltip-bootstrap .ui-tooltip-titlebar .ui-state-default{
+			right: 9px; top: 49%;
+			border-style: none;
+		}
+
+	.ui-tooltip-bootstrap .ui-tooltip-icon{
+		background: white;
+	}
+
+		.ui-tooltip-bootstrap .ui-tooltip-icon .ui-icon{
+			width: auto;
+			height: auto;
+			float: right;
+			font-size: 20px;
+			font-weight: bold;
+			line-height: 18px;
+			color: #000000;
+			text-shadow: 0 1px 0 #ffffff;
+			opacity: 0.2;
+			filter: alpha(opacity=20);
+		}
+
+		.ui-tooltip-bootstrap .ui-tooltip-icon .ui-icon:hover{
+			color: #000000;
+			text-decoration: none;
+			cursor: pointer;
+			opacity: 0.4;
+			filter: alpha(opacity=40);
+		}
+
+
+/* IE9 fix - removes all filters */
+.ui-tooltip:not(.ie9haxors) div.ui-tooltip-content,
+.ui-tooltip:not(.ie9haxors) div.ui-tooltip-titlebar{
+	filter: none;
+	-ms-filter: none;
+}
+
+
+/* Tips plugin */
+.ui-tooltip .ui-tooltip-tip{
+	margin: 0 auto;
+	overflow: hidden;
+	z-index: 10;
+}
+
+	.ui-tooltip .ui-tooltip-tip,
+	.ui-tooltip .ui-tooltip-tip .qtip-vml{
+		position: absolute;
+		
+		line-height: 0.1px !important;
+		font-size: 0.1px !important;
+		color: #123456;
+
+		background: transparent;
+		border: 0 dashed transparent;
+	}
+	
+	.ui-tooltip .ui-tooltip-tip canvas{ top: 0; left: 0; }
+
+	.ui-tooltip .ui-tooltip-tip .qtip-vml{
+		behavior: url(#default#VML);
+		display: inline-block;
+		visibility: visible;
+	}
+/* Modal plugin */
+#qtip-overlay{
+	position: fixed;
+	left: -10000em;
+	top: -10000em;
+}
+
+	/* Applied to modals with show.modal.blur set to true */
+	#qtip-overlay.blurs{ cursor: pointer; }
+
+	/* Change opacity of overlay here */
+	#qtip-overlay div{
+		position: absolute;
+		left: 0; top: 0;
+		width: 100%; height: 100%;
+
+		background-color: black;
+
+		opacity: 0.7;
+		filter:alpha(opacity=70);
+		-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=70)";
+	}
+
diff --git a/v3/js/jquery.qtip.min.js b/v3/js/jquery.qtip.min.js
new file mode 100644
index 000000000..3971f6df5
--- /dev/null
+++ b/v3/js/jquery.qtip.min.js
@@ -0,0 +1,2 @@
+/*! qTip2 v2.0.0 | http://craigsworks.com/projects/qtip2/ | Licensed MIT, GPL */
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Date: Fri, 5 Oct 2012 15:08:11 -0700
Subject: [PATCH 459/502] more!

---
 v3/commentary-bubbles-demo.js | 82 ++++++++++++++++++++++++---------
 v3/css/jquery.qtip.css        | 85 ++++++++++++++++++++++++++++++++++-
 2 files changed, 145 insertions(+), 22 deletions(-)

diff --git a/v3/commentary-bubbles-demo.js b/v3/commentary-bubbles-demo.js
index e7a8daf21..30af55417 100644
--- a/v3/commentary-bubbles-demo.js
+++ b/v3/commentary-bubbles-demo.js
@@ -4,6 +4,50 @@
 var listSumTrace = {"code": "def listSum(numbers):\n  if not numbers:\n    return 0\n  else:\n    (f, rest) = numbers\n    return f + listSum(rest)\n\nmyList = (1, (2, (3, None)))\ntotal = listSum(myList)\n", "trace": [{"ordered_globals": [], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {}, "heap": {}, "line": 1, "event": "step_line"}, {"ordered_globals": ["listSum"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null]}, "line": 8, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 9, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", 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{"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4]}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", 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"parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, 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"is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4], "rest": null, "f": 3}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 4, "encoded_locals": {"numbers": null}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f4", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", 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"parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 4, "encoded_locals": {"numbers": null}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f4", "ordered_varnames": ["numbers"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 3, "event": "step_line"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"numbers": ["REF", 4], "rest": null, "f": 3}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 4, "encoded_locals": {"__return__": 0, "numbers": null}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f4", "ordered_varnames": ["numbers", "__return__"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 3, "event": "return"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 3, "encoded_locals": {"__return__": 3, "numbers": ["REF", 4], "rest": null, "f": 3}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f3", "ordered_varnames": ["numbers", "f", "rest", "__return__"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "return"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": false, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest"]}, {"frame_id": 2, "encoded_locals": {"__return__": 5, "numbers": ["REF", 3], "rest": ["REF", 4], "f": 2}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f2", "ordered_varnames": ["numbers", "f", "rest", "__return__"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "return"}, {"ordered_globals": ["listSum", "myList"], "stdout": "", "func_name": "listSum", "stack_to_render": [{"frame_id": 1, "encoded_locals": {"__return__": 6, "numbers": ["REF", 2], "rest": ["REF", 3], "f": 1}, "is_highlighted": true, "is_parent": false, "func_name": "listSum", "is_zombie": false, "parent_frame_id_list": [], "unique_hash": "listSum_f1", "ordered_varnames": ["numbers", "f", "rest", "__return__"]}], "globals": {"myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 6, "event": "return"}, {"ordered_globals": ["listSum", "myList", "total"], "stdout": "", "func_name": "", "stack_to_render": [], "globals": {"total": 6, "myList": ["REF", 2], "listSum": ["REF", 1]}, "heap": {"1": ["FUNCTION", "listSum(numbers)", null], "2": ["TUPLE", 1, ["REF", 3]], "3": ["TUPLE", 2, ["REF", 4]], "4": ["TUPLE", 3, null]}, "line": 9, "event": "return"}]};
 
 
+var qtipShared = {
+  show: {
+    ready: true, // show on document.ready instead of on mouseenter
+    delay: 0,
+    event: null,
+  },
+  hide: {
+    fixed: true,
+    event: null,
+  },
+  style: {
+    classes: 'ui-tooltip-pgbootstrap', // my own customized version of the bootstrap style - see css/jquery.qtip.css
+  },
+};
+
+
+function createSpeechBubble(domID, my, at, htmlContent) {
+  var hashID = '#' + domID;
+  $(hashID).qtip($.extend({}, qtipShared, {
+    content: htmlContent,
+    id: domID,
+    position: {
+      my: my,
+      at: at,
+      effect: null, // disable all cutesy animations
+    },
+  }));
+
+
+  $('#ui-tooltip-' + domID + '-content').click(function() {
+    if (!$(hashID).data('qtip-minimized')) {
+      $(hashID)
+        .data('qtip-minimized', true)
+        .qtip('option', 'content.text', ' ');
+    }
+    else {
+      $(hashID)
+        .data('qtip-minimized', false)
+        .qtip('option', 'content.text', htmlContent);
+    }
+  });
+}
+
+
 $(document).ready(function() {
   /*
   var listSumVisualizer = new ExecutionVisualizer('listSumDiv', listSumTrace,
@@ -11,25 +55,21 @@ $(document).ready(function() {
                                                    editCodeBaseURL: 'http://pythontutor.com/visualize.html'});
   */
 
-  $('#v1__heap_object_4').qtip({
-    content: 'This is the final element of our linked list. Its car is 3 and cdr is None',
-    id: 'v1__heap_object_4',
-    position: {
-      my: 'bottom left',
-      at: 'top center',
-      adjust: {x: 0, y: 0},
-    },
-    show: {
-      ready: true, // show on document.ready instead of on mouseenter
-      //delay: 0,
-      event: null,
-    },
-    hide: {
-      fixed: true,
-      event: null,
-    },
-    style: {
-      classes: 'ui-tooltip-bootstrap',
-    },
-  });
+  createSpeechBubble('v1__heap_object_1', 'bottom left', 'top center',
+                     "Here's a function!");
+
+  createSpeechBubble('v1__heap_object_2', 'bottom left', 'top center',
+                     'This is the head of our linked list.');
+
+  createSpeechBubble('v1__heap_object_4', 'bottom left', 'top center',
+                     'This is the final element of our linked list. Its car is 3 and cdr is None');
+
+
+  createSpeechBubble('v1__stack0', 'right center', 'left center',
+                     "The first of several recursive calls.");
+
+  createSpeechBubble('v1__stack2', 'right center', 'left center',
+                     "Another recursive call.");
+
+
 });
diff --git a/v3/css/jquery.qtip.css b/v3/css/jquery.qtip.css
index fb7fe24b6..331781643 100644
--- a/v3/css/jquery.qtip.css
+++ b/v3/css/jquery.qtip.css
@@ -2,6 +2,8 @@
 * http://craigsworks.com/projects/qtip2/
 * Copyright (c) 2012 Craig Michael Thompson; Licensed MIT, GPL */
 
+/* Modified by Philip Guo */
+
 /* Fluid class for determining actual width in IE */
 #qtip-rcontainer{
 	position: absolute;
@@ -243,7 +245,8 @@
 /* Add rounded corners to your tooltips in: FF3+, Chrome 2+, Opera 10.6+, IE9+, Safari 2+ */
 .ui-tooltip-rounded,
 .ui-tooltip-tipsy,
-.ui-tooltip-bootstrap{
+.ui-tooltip-bootstrap,
+.ui-tooltip-pgbootstrap{
 	-moz-border-radius: 5px;
 	-webkit-border-radius: 5px;
 	border-radius: 5px;
@@ -514,6 +517,86 @@
 		}
 
 
+/* modified version of Twitter bootstrap style by Philip Guo */
+.ui-tooltip-pgbootstrap{
+	font-size: 9pt;
+	line-height: 1.3em;
+
+  font-family: verdana, arial, helvetica, sans-serif;
+
+	color: #333;
+	background-color: #ffffff;
+
+	max-width: 350px;
+	min-width: 25px;
+
+	border: 2px solid #4284D3;
+
+  cursor: pointer;
+
+	*border-right-width: 2px;
+	*border-bottom-width: 2px;
+
+	-webkit-border-radius: 5px;
+	-moz-border-radius: 5px;
+	border-radius: 5px;
+
+  /* way too poofy ...
+	-webkit-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
+	-moz-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
+	box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
+  */
+
+	-webkit-box-shadow: 2px 2px 3px 0px rgba(0, 0, 0, 0.2);
+	-moz-box-shadow: 2px 2px 3px 0px rgba(0, 0, 0, 0.2);
+	box-shadow: 2px 2px 3px 0px rgba(0, 0, 0, 0.2);
+
+	-webkit-background-clip: padding-box;
+	-moz-background-clip: padding;
+	background-clip: padding-box;
+}
+
+	.ui-tooltip-pgbootstrap .ui-tooltip-titlebar{
+		font-size: 18px;
+		line-height: 22px;
+
+		border-bottom: 1px solid #ccc;
+		background-color: transparent;
+	}
+
+		.ui-tooltip-pgbootstrap .ui-tooltip-titlebar .ui-state-default{
+			right: 9px; top: 49%;
+			border-style: none;
+		}
+
+	.ui-tooltip-pgbootstrap .ui-tooltip-icon{
+		background: white;
+	}
+
+		.ui-tooltip-pgbootstrap .ui-tooltip-icon .ui-icon{
+			width: auto;
+			height: auto;
+			float: right;
+			font-size: 20px;
+			font-weight: bold;
+			line-height: 18px;
+			color: #000000;
+			text-shadow: 0 1px 0 #ffffff;
+			opacity: 0.2;
+			filter: alpha(opacity=20);
+		}
+
+		.ui-tooltip-pgbootstrap .ui-tooltip-icon .ui-icon:hover{
+			color: #000000;
+			text-decoration: none;
+			cursor: pointer;
+			opacity: 0.4;
+			filter: alpha(opacity=40);
+		}
+
+
+
+
 /* IE9 fix - removes all filters */
 .ui-tooltip:not(.ie9haxors) div.ui-tooltip-content,
 .ui-tooltip:not(.ie9haxors) div.ui-tooltip-titlebar{

From 9d15d95133f8d03e94e45ca4b7f392bf98fd937c Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 5 Oct 2012 15:46:55 -0700
Subject: [PATCH 460/502] minor

---
 v3/js/pytutor.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 4c27b63fc..b0d8a53e9 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -667,6 +667,9 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
       if (i == 0) {
         return 'lineNo' + d.lineNumber;
       }
+      else {
+        return 'cod' + d.lineNumber;
+      }
     })
     .html(function(d, i) {
       if (i == 0) {
@@ -1780,6 +1783,9 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
         var valStringRepr = String(typeof val) + ':' + String(val);
 
         // SUPER HACK - retrieve previous value as a hidden attribute
+        // TODO: use the jQuery .data() method to store arbitrary data
+        // inside of a DOM element, so that we can avoid munging strings:
+        //   http://api.jquery.com/data/
         var prevValStringRepr = $(this).attr('data-curvalue');
 
         // IMPORTANT! only clear the div and render a new element if the

From 13b33199b60949eef5e774547912c8a4d2a9c3ad Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 5 Oct 2012 15:47:13 -0700
Subject: [PATCH 461/502] more updates

---
 v3/commentary-bubbles-demo.html | 2 +-
 v3/commentary-bubbles-demo.js   | 8 ++++++++
 v3/css/jquery.qtip.css          | 5 +++++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/v3/commentary-bubbles-demo.html b/v3/commentary-bubbles-demo.html
index c75a213c5..c072cb4d5 100644
--- a/v3/commentary-bubbles-demo.html
+++ b/v3/commentary-bubbles-demo.html
@@ -32,7 +32,7 @@
 
  
 
-
        
                  
              
    1def listSum(numbers):
    2  if not numbers:
    3    return 0
    4  else:
    5    (f, rest) = numbers
    6    return f + listSum(rest)
    7
    8myList = (1, (2, (3, None)))
    9total = listSum(myList)
                        
              
                                        Step 12 of 18                                  
                      
            
     line that has just executed
     next line to execute
            
            Program output:
                    
              		              
              
                
                                  
                      
    Frames
                    
    Global variables
    listSum
     
    myList
     
                    
                    
    listSum
    numbers
     
    f1
    rest
     
    listSum
    numbers
     
    f2
    rest
     
    listSum
    numbers
     
    f3
    restNone
                      		                              
                      
    Objects
                    
    function listSum(numbers)
    tuple
    01
    1
     
    tuple
    01
    2
     
    tuple
    01
    3None
                      		            
              
            
              		    
      
    
+
        
                  
              
    1def listSum(numbers):
    2  if not numbers:
    3    return 0
    4  else:
    5    (f, rest) = numbers
    6    return f + listSum(rest)
    7
    8myList = (1, (2, (3, None)))
    9total = listSum(myList)
                        
              
                                        Step 12 of 18                                  
                      
            
     line that has just executed
     next line to execute
            
            Program output:
                    
              		              
              
                
                                  
                      
    Frames
                    
    Global variables
    listSum
     
    myList
     
                    
                    
    listSum
    numbers
     
    f1
    rest
     
    listSum
    numbers
     
    f2
    rest
     
    listSum
    numbers
     
    f3
    restNone
                      		                              
                      
    Objects
                    
    function listSum(numbers)
    tuple
    01
    1
     
    tuple
    01
    2
     
    tuple
    01
    3None
                      		            
              
            
              		    
      
    
 
 
 
diff --git a/v3/commentary-bubbles-demo.js b/v3/commentary-bubbles-demo.js
index 30af55417..6131d7be8 100644
--- a/v3/commentary-bubbles-demo.js
+++ b/v3/commentary-bubbles-demo.js
@@ -71,5 +71,13 @@ $(document).ready(function() {
   createSpeechBubble('v1__stack2', 'right center', 'left center',
                      "Another recursive call.");
 
+  createSpeechBubble('cod4', 'left center', 'right center',
+                     "line four, booooooooooooo ...");
+
+  createSpeechBubble('cod5', 'left center', 'right center',
+                     "line five, yay!!!");
+
+  createSpeechBubble('cod9', 'left center', 'right center',
+                     "line nine, yay!!!");
 
 });
diff --git a/v3/css/jquery.qtip.css b/v3/css/jquery.qtip.css
index 331781643..59196f3db 100644
--- a/v3/css/jquery.qtip.css
+++ b/v3/css/jquery.qtip.css
@@ -564,6 +564,11 @@
 		background-color: transparent;
 	}
 
+	.ui-tooltip-pgbootstrap .ui-tooltip-content{
+		padding: 5px /* 5px is minimum or else it might look ugly */ 7px;
+	}
+	
+
 		.ui-tooltip-pgbootstrap .ui-tooltip-titlebar .ui-state-default{
 			right: 9px; top: 49%;
 			border-style: none;

From c5c8b2788603e12a093209688cdd7a6f73d0c10b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 5 Oct 2012 16:27:56 -0700
Subject: [PATCH 462/502] make more unique IDs

---
 v3/js/pytutor.js | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index b0d8a53e9..2925f8fae 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -668,7 +668,7 @@ ExecutionVisualizer.prototype.renderPyCodeOutput = function() {
         return 'lineNo' + d.lineNumber;
       }
       else {
-        return 'cod' + d.lineNumber;
+        return myViz.generateID('cod' + d.lineNumber); // make globally unique (within the page)
       }
     })
     .html(function(d, i) {
@@ -1755,7 +1755,10 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   globalVarTable
     .enter()
-    .append('tr');
+    .append('tr')
+    .attr('id', function(d, i) {
+        return myViz.generateID(varnameToCssID('globals__' + d)); // make globally unique (within the page)
+    });
 
 
   var globalVarTableCells = globalVarTable
@@ -1914,7 +1917,10 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
 
   stackVarTable
     .enter()
-    .append('tr');
+    .append('tr')
+    .attr('id', function(d, i) {
+        return myViz.generateID(varnameToCssID(d.frame.unique_hash + '__' + d.varname)); // make globally unique (within the page)
+    });
  
 
   var stackVarTableCells = stackVarTable

From e9b1fbb70c4c24ca6a86b2c0640f52fd78548eb2 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 5 Oct 2012 16:38:50 -0700
Subject: [PATCH 463/502] updated speech bubbles example

---
 v3/commentary-bubbles-demo.html |  4 +++-
 v3/commentary-bubbles-demo.js   | 11 ++++++++---
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/v3/commentary-bubbles-demo.html b/v3/commentary-bubbles-demo.html
index c072cb4d5..cce5c4f65 100644
--- a/v3/commentary-bubbles-demo.html
+++ b/v3/commentary-bubbles-demo.html
@@ -32,7 +32,9 @@
 
  
 
-
        
                  
              
    1def listSum(numbers):
    2  if not numbers:
    3    return 0
    4  else:
    5    (f, rest) = numbers
    6    return f + listSum(rest)
    7
    8myList = (1, (2, (3, None)))
    9total = listSum(myList)
                        
              
                                        Step 12 of 18                                  
                      
            
     line that has just executed
     next line to execute
            
            Program output:
                    
              		              
              
                
                                  
                      
    Frames
                    
    Global variables
    listSum
     
    myList
     
                    
                    
    listSum
    numbers
     
    f1
    rest
     
    listSum
    numbers
     
    f2
    rest
     
    listSum
    numbers
     
    f3
    restNone
                      		                              
                      
    Objects
                    
    function listSum(numbers)
    tuple
    01
    1
     
    tuple
    01
    2
     
    tuple
    01
    3None
                      		            
              
            
              		    
      
    
+
+
+
        
                  
              
    1def listSum(numbers):
    2  if not numbers:
    3    return 0
    4  else:
    5    (f, rest) = numbers
    6    return f + listSum(rest)
    7
    8myList = (1, (2, (3, None)))
    9total = listSum(myList)
                        
              
                                        Step 15 of 18                                  
                      
            
     line that has just executed
     next line to execute
            
            Program output:
                    
              		              
              
                
                                  
                      
    Frames
                    
    Global variables
    listSum
     
    myList
     
                    
                    
    listSum
    numbers
     
    f1
    rest
     
    listSum
    numbers
     
    f2
    rest
     
    listSum
    numbers
     
    f3
    restNone
    listSum
    numbersNone
    Return
    value    		0
                      		                              
                      
    Objects
                    
    function listSum(numbers)
    tuple
    01
    1
     
    tuple
    01
    2
     
    tuple
    01
    3None
                      		            
              
            
              		    
      
    
 
 
 
diff --git a/v3/commentary-bubbles-demo.js b/v3/commentary-bubbles-demo.js
index 6131d7be8..57ed88e88 100644
--- a/v3/commentary-bubbles-demo.js
+++ b/v3/commentary-bubbles-demo.js
@@ -71,13 +71,18 @@ $(document).ready(function() {
   createSpeechBubble('v1__stack2', 'right center', 'left center',
                      "Another recursive call.");
 
-  createSpeechBubble('cod4', 'left center', 'right center',
+  createSpeechBubble('v1__cod4', 'left center', 'right center',
                      "line four, booooooooooooo ...");
 
-  createSpeechBubble('cod5', 'left center', 'right center',
+  createSpeechBubble('v1__cod5', 'left center', 'right center',
                      "line five, yay!!!");
 
-  createSpeechBubble('cod9', 'left center', 'right center',
+  createSpeechBubble('v1__cod9', 'left center', 'right center',
                      "line nine, yay!!!");
 
+  createSpeechBubble('v1__listSum_f2__numbers', 'right center', 'left center',
+                     "this is a variable, of course!");
+
+  createSpeechBubble('v1__listSum_f2__rest', 'right center', 'left center',
+                     "this is another variable, of course; what else would it be?!?");
 });

From 4afd4f5039a1b0bbef5a83ef2defec5d29b034cb Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Fri, 5 Oct 2012 22:12:02 -0700
Subject: [PATCH 464/502] minor

---
 v3/css/jquery.qtip.css | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/css/jquery.qtip.css b/v3/css/jquery.qtip.css
index 59196f3db..f44caf6eb 100644
--- a/v3/css/jquery.qtip.css
+++ b/v3/css/jquery.qtip.css
@@ -528,7 +528,7 @@
 	background-color: #ffffff;
 
 	max-width: 350px;
-	min-width: 25px;
+	min-width: 10px;
 
 	border: 2px solid #4284D3;
 

From 962745e00944d895d789ae4567027b0d253c954b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 6 Oct 2012 10:40:33 -0700
Subject: [PATCH 465/502] more demo action

---
 v3/commentary-bubbles-demo.css  | 109 ++++++++++++++++++++++++++++++++
 v3/commentary-bubbles-demo.html |   1 +
 v3/commentary-bubbles-demo.js   |  40 +++++++-----
 v3/css/jquery.qtip.css          |  90 +-------------------------
 4 files changed, 136 insertions(+), 104 deletions(-)
 create mode 100644 v3/commentary-bubbles-demo.css

diff --git a/v3/commentary-bubbles-demo.css b/v3/commentary-bubbles-demo.css
new file mode 100644
index 000000000..1072ecb0f
--- /dev/null
+++ b/v3/commentary-bubbles-demo.css
@@ -0,0 +1,109 @@
+/* For styling tricks, see: http://css-tricks.com/textarea-tricks/ */
+textarea.bubbleInputText {
+  border: 1px solid #ccc;
+  outline: none;
+  overflow: auto; /* to look pretty on IE */
+
+  /* make sure textarea doesn't grow and stretch the enclosing bubble */
+  resize: none;
+  width: 200px;
+  max-width: 200px;
+  height: 60px;
+  max-height: 60px;
+}
+
+
+.ui-tooltip-pgbootstrap,
+textarea.bubbleInputText {
+	font-size: 9pt;
+	line-height: 1.3em;
+
+  font-family: verdana, arial, helvetica, sans-serif;
+}
+
+
+/* modified version of Twitter bootstrap style by Philip Guo */
+.ui-tooltip-pgbootstrap{
+	color: #333;
+	background-color: #ffffff;
+
+	max-width: 250px;
+	min-width: 10px;
+
+	border: 2px solid #4284D3;
+
+  cursor: pointer;
+
+	*border-right-width: 2px;
+	*border-bottom-width: 2px;
+
+	-webkit-border-radius: 5px;
+	-moz-border-radius: 5px;
+	border-radius: 5px;
+
+  /* way too poofy ...
+	-webkit-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
+	-moz-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
+	box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
+  */
+
+	-webkit-box-shadow: 2px 2px 3px 0px rgba(0, 0, 0, 0.2);
+	-moz-box-shadow: 2px 2px 3px 0px rgba(0, 0, 0, 0.2);
+	box-shadow: 2px 2px 3px 0px rgba(0, 0, 0, 0.2);
+
+	-webkit-background-clip: padding-box;
+	-moz-background-clip: padding;
+	background-clip: padding-box;
+}
+
+	.ui-tooltip-pgbootstrap .ui-tooltip-titlebar{
+		font-size: 18px;
+		line-height: 22px;
+
+		border-bottom: 1px solid #ccc;
+		background-color: transparent;
+	}
+
+	.ui-tooltip-pgbootstrap .ui-tooltip-content{
+		padding: 5px /* 5px is minimum or else it might look ugly */ 7px;
+	}
+	
+
+		.ui-tooltip-pgbootstrap .ui-tooltip-titlebar .ui-state-default{
+			right: 9px; top: 49%;
+			border-style: none;
+		}
+
+	.ui-tooltip-pgbootstrap .ui-tooltip-icon{
+		background: white;
+	}
+
+		.ui-tooltip-pgbootstrap .ui-tooltip-icon .ui-icon{
+			width: auto;
+			height: auto;
+			float: right;
+			font-size: 20px;
+			font-weight: bold;
+			line-height: 18px;
+			color: #000000;
+			text-shadow: 0 1px 0 #ffffff;
+			opacity: 0.2;
+			filter: alpha(opacity=20);
+		}
+
+		.ui-tooltip-pgbootstrap .ui-tooltip-icon .ui-icon:hover{
+			color: #000000;
+			text-decoration: none;
+			cursor: pointer;
+			opacity: 0.4;
+			filter: alpha(opacity=40);
+		}
+
+
+/* Add rounded corners to your tooltips in: FF3+, Chrome 2+, Opera 10.6+, IE9+, Safari 2+ */
+.ui-tooltip-pgbootstrap{
+	-moz-border-radius: 5px;
+	-webkit-border-radius: 5px;
+	border-radius: 5px;
+}
+
diff --git a/v3/commentary-bubbles-demo.html b/v3/commentary-bubbles-demo.html
index cce5c4f65..c94ddb9e4 100644
--- a/v3/commentary-bubbles-demo.html
+++ b/v3/commentary-bubbles-demo.html
@@ -23,6 +23,7 @@
 
 
 
+
 
 
 
diff --git a/v3/commentary-bubbles-demo.js b/v3/commentary-bubbles-demo.js
index 57ed88e88..3b6736a67 100644
--- a/v3/commentary-bubbles-demo.js
+++ b/v3/commentary-bubbles-demo.js
@@ -20,7 +20,7 @@ var qtipShared = {
 };
 
 
-function createSpeechBubble(domID, my, at, htmlContent) {
+function createSpeechBubble(domID, my, at, htmlContent, isInput) {
   var hashID = '#' + domID;
   $(hashID).qtip($.extend({}, qtipShared, {
     content: htmlContent,
@@ -33,21 +33,28 @@ function createSpeechBubble(domID, my, at, htmlContent) {
   }));
 
 
-  $('#ui-tooltip-' + domID + '-content').click(function() {
-    if (!$(hashID).data('qtip-minimized')) {
-      $(hashID)
-        .data('qtip-minimized', true)
-        .qtip('option', 'content.text', ' ');
-    }
-    else {
-      $(hashID)
-        .data('qtip-minimized', false)
-        .qtip('option', 'content.text', htmlContent);
-    }
-  });
+  if (isInput) {
+
+  }
+  else {
+    $('#ui-tooltip-' + domID + '-content').click(function() {
+      if (!$(hashID).data('qtip-minimized')) {
+        $(hashID)
+          .data('qtip-minimized', true)
+          .qtip('option', 'content.text', ' ');
+      }
+      else {
+        $(hashID)
+          .data('qtip-minimized', false)
+          .qtip('option', 'content.text', htmlContent);
+      }
+    });
+  }
 }
 
 
+inputTextarea = ''
+
 $(document).ready(function() {
   /*
   var listSumVisualizer = new ExecutionVisualizer('listSumDiv', listSumTrace,
@@ -68,8 +75,8 @@ $(document).ready(function() {
   createSpeechBubble('v1__stack0', 'right center', 'left center',
                      "The first of several recursive calls.");
 
-  createSpeechBubble('v1__stack2', 'right center', 'left center',
-                     "Another recursive call.");
+  //createSpeechBubble('v1__stack2', 'right center', 'left center',
+  //                   "Another recursive call.");
 
   createSpeechBubble('v1__cod4', 'left center', 'right center',
                      "line four, booooooooooooo ...");
@@ -85,4 +92,7 @@ $(document).ready(function() {
 
   createSpeechBubble('v1__listSum_f2__rest', 'right center', 'left center',
                      "this is another variable, of course; what else would it be?!?");
+
+  createSpeechBubble('v1__stack2', 'right center', 'left center',
+                     inputTextarea, true);
 });
diff --git a/v3/css/jquery.qtip.css b/v3/css/jquery.qtip.css
index f44caf6eb..fb7fe24b6 100644
--- a/v3/css/jquery.qtip.css
+++ b/v3/css/jquery.qtip.css
@@ -2,8 +2,6 @@
 * http://craigsworks.com/projects/qtip2/
 * Copyright (c) 2012 Craig Michael Thompson; Licensed MIT, GPL */
 
-/* Modified by Philip Guo */
-
 /* Fluid class for determining actual width in IE */
 #qtip-rcontainer{
 	position: absolute;
@@ -245,8 +243,7 @@
 /* Add rounded corners to your tooltips in: FF3+, Chrome 2+, Opera 10.6+, IE9+, Safari 2+ */
 .ui-tooltip-rounded,
 .ui-tooltip-tipsy,
-.ui-tooltip-bootstrap,
-.ui-tooltip-pgbootstrap{
+.ui-tooltip-bootstrap{
 	-moz-border-radius: 5px;
 	-webkit-border-radius: 5px;
 	border-radius: 5px;
@@ -517,91 +514,6 @@
 		}
 
 
-/* modified version of Twitter bootstrap style by Philip Guo */
-.ui-tooltip-pgbootstrap{
-	font-size: 9pt;
-	line-height: 1.3em;
-
-  font-family: verdana, arial, helvetica, sans-serif;
-
-	color: #333;
-	background-color: #ffffff;
-
-	max-width: 350px;
-	min-width: 10px;
-
-	border: 2px solid #4284D3;
-
-  cursor: pointer;
-
-	*border-right-width: 2px;
-	*border-bottom-width: 2px;
-
-	-webkit-border-radius: 5px;
-	-moz-border-radius: 5px;
-	border-radius: 5px;
-
-  /* way too poofy ...
-	-webkit-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
-	-moz-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
-	box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
-  */
-
-	-webkit-box-shadow: 2px 2px 3px 0px rgba(0, 0, 0, 0.2);
-	-moz-box-shadow: 2px 2px 3px 0px rgba(0, 0, 0, 0.2);
-	box-shadow: 2px 2px 3px 0px rgba(0, 0, 0, 0.2);
-
-	-webkit-background-clip: padding-box;
-	-moz-background-clip: padding;
-	background-clip: padding-box;
-}
-
-	.ui-tooltip-pgbootstrap .ui-tooltip-titlebar{
-		font-size: 18px;
-		line-height: 22px;
-
-		border-bottom: 1px solid #ccc;
-		background-color: transparent;
-	}
-
-	.ui-tooltip-pgbootstrap .ui-tooltip-content{
-		padding: 5px /* 5px is minimum or else it might look ugly */ 7px;
-	}
-	
-
-		.ui-tooltip-pgbootstrap .ui-tooltip-titlebar .ui-state-default{
-			right: 9px; top: 49%;
-			border-style: none;
-		}
-
-	.ui-tooltip-pgbootstrap .ui-tooltip-icon{
-		background: white;
-	}
-
-		.ui-tooltip-pgbootstrap .ui-tooltip-icon .ui-icon{
-			width: auto;
-			height: auto;
-			float: right;
-			font-size: 20px;
-			font-weight: bold;
-			line-height: 18px;
-			color: #000000;
-			text-shadow: 0 1px 0 #ffffff;
-			opacity: 0.2;
-			filter: alpha(opacity=20);
-		}
-
-		.ui-tooltip-pgbootstrap .ui-tooltip-icon .ui-icon:hover{
-			color: #000000;
-			text-decoration: none;
-			cursor: pointer;
-			opacity: 0.4;
-			filter: alpha(opacity=40);
-		}
-
-
-
-
 /* IE9 fix - removes all filters */
 .ui-tooltip:not(.ie9haxors) div.ui-tooltip-content,
 .ui-tooltip:not(.ie9haxors) div.ui-tooltip-titlebar{

From 692a2550d8cddad11ba397ff0f5c07c3f087dbe0 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 6 Oct 2012 14:32:46 -0700
Subject: [PATCH 466/502] keep chuggin' along on demo

---
 v3/commentary-bubbles-demo.css |   4 +
 v3/commentary-bubbles-demo.js  | 135 ++++++++++++++++++++++++++++++++-
 2 files changed, 135 insertions(+), 4 deletions(-)

diff --git a/v3/commentary-bubbles-demo.css b/v3/commentary-bubbles-demo.css
index 1072ecb0f..bb3d92a53 100644
--- a/v3/commentary-bubbles-demo.css
+++ b/v3/commentary-bubbles-demo.css
@@ -107,3 +107,7 @@ textarea.bubbleInputText {
 	border-radius: 5px;
 }
 
+
+.ui-tooltip-pgbootstrap-stub{
+	border: 2px solid #999;
+}
diff --git a/v3/commentary-bubbles-demo.js b/v3/commentary-bubbles-demo.js
index 3b6736a67..01e05f9f9 100644
--- a/v3/commentary-bubbles-demo.js
+++ b/v3/commentary-bubbles-demo.js
@@ -15,7 +15,7 @@ var qtipShared = {
     event: null,
   },
   style: {
-    classes: 'ui-tooltip-pgbootstrap', // my own customized version of the bootstrap style - see css/jquery.qtip.css
+    classes: 'ui-tooltip-pgbootstrap', // my own customized version of the bootstrap style
   },
 };
 
@@ -53,15 +53,142 @@ function createSpeechBubble(domID, my, at, htmlContent, isInput) {
 }
 
 
+// a speech bubble annotation to attach to:
+//   'codeline' - a line of code
+//   'frame'    - a stack frame
+//   'variable' - a variable within a stack frame
+//   'object'   - an object on the heap
+// (as determined by the 'type' param)
+//
+// domID is the ID of the element to attach to (without the leading '#' sign)
+function AnnotationBubble(type, domID) {
+  this.domID = domID;
+  this.hashID = '#' + domID;
+
+  if (type == 'codeline') {
+    this.my = 'left center';
+    this.at = 'right center';
+  }
+  else if (type == 'frame') {
+    this.my = 'right center';
+    this.at = 'left center';
+  }
+  else if (type == 'variable') {
+    this.my = 'right center';
+    this.at = 'left center';
+  }
+  else if (type == 'object') {
+    this.my = 'bottom left';
+    this.at = 'top center';
+  }
+  else {
+    assert(false);
+  }
+
+  // possible states:
+  //   'hidden'
+  //   'edit'
+  //   'view'
+  //   'minimized'
+  //   'stub'
+  this.state = 'hidden';
+
+  this.text = ''; // the actual contents of the annotation bubble
+}
+
+AnnotationBubble.prototype.showStub = function() {
+  assert(this.state == 'hidden' || this.state == 'edit');
+  assert(this.text == '');
+
+  // destroy then create a new tip:
+  this.destroyQTip();
+  $(this.hashID).qtip($.extend({}, qtipShared, {
+    content: ' ',
+    id: this.domID,
+    position: {
+      my: this.my,
+      at: this.at,
+      effect: null, // disable all cutesy animations
+    },
+    style: {
+      classes: 'ui-tooltip-pgbootstrap ui-tooltip-pgbootstrap-stub'
+    }
+  }));
+
+  this.state = 'stub';
+}
+
+AnnotationBubble.prototype.showEditor = function() {
+  assert(this.state == 'stub' || this.state == 'view');
+
+  var ta = '';
+
+  // destroy then create a new tip:
+  this.destroyQTip();
+  $(this.hashID).qtip($.extend({}, qtipShared, {
+    content: ta,
+    id: this.domID,
+    position: {
+      my: this.my,
+      at: this.at,
+      effect: null, // disable all cutesy animations
+    }
+  }));
+
+  this.state = 'edit';
+}
+
+AnnotationBubble.prototype.showViewer = function() {
+  assert(this.state == 'edit');
+  assert(this.text); // must be non-empty!
+
+  // destroy then create a new tip:
+  this.destroyQTip();
+  $(this.hashID).qtip($.extend({}, qtipShared, {
+    content: this.text,
+    id: this.domID,
+    position: {
+      my: this.my,
+      at: this.at,
+      effect: null, // disable all cutesy animations
+    }
+  }));
+
+  this.state = 'view';
+}
+
+AnnotationBubble.prototype.minimizeViewer = function() {
+  assert(this.state == 'view');
+  $(this.hashID).qtip('option', 'content.text', ' ');
+  this.state = 'minimized';
+}
+
+AnnotationBubble.prototype.restoreViewer = function() {
+  assert(this.state == 'minimized');
+  $(this.hashID).qtip('option', 'content.text', this.text);
+  this.state = 'view';
+}
+
+
+AnnotationBubble.prototype.destroyQTip = function() {
+  $(this.hashID).qtip('destroy');
+}
+
+
 inputTextarea = ''
 
 $(document).ready(function() {
+  $.fn.qtip.styles = {};
+  $.fn.qtip.styles.stubStyle = {border: {color: '#999'}};
+
+
   /*
   var listSumVisualizer = new ExecutionVisualizer('listSumDiv', listSumTrace,
                                                   {embeddedMode: false,
                                                    editCodeBaseURL: 'http://pythontutor.com/visualize.html'});
   */
 
+  /*
   createSpeechBubble('v1__heap_object_1', 'bottom left', 'top center',
                      "Here's a function!");
 
@@ -75,9 +202,6 @@ $(document).ready(function() {
   createSpeechBubble('v1__stack0', 'right center', 'left center',
                      "The first of several recursive calls.");
 
-  //createSpeechBubble('v1__stack2', 'right center', 'left center',
-  //                   "Another recursive call.");
-
   createSpeechBubble('v1__cod4', 'left center', 'right center',
                      "line four, booooooooooooo ...");
 
@@ -95,4 +219,7 @@ $(document).ready(function() {
 
   createSpeechBubble('v1__stack2', 'right center', 'left center',
                      inputTextarea, true);
+  */
+
+  x = new AnnotationBubble('frame', 'v1__stack2');
 });

From f6812256c71f9ea287719d4c2fbda4565698fe02 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 6 Oct 2012 15:29:14 -0700
Subject: [PATCH 467/502] buh

---
 v3/commentary-bubbles-demo.css |  7 +++---
 v3/commentary-bubbles-demo.js  | 39 ++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+), 4 deletions(-)

diff --git a/v3/commentary-bubbles-demo.css b/v3/commentary-bubbles-demo.css
index bb3d92a53..7b1916984 100644
--- a/v3/commentary-bubbles-demo.css
+++ b/v3/commentary-bubbles-demo.css
@@ -8,17 +8,16 @@ textarea.bubbleInputText {
   resize: none;
   width: 200px;
   max-width: 200px;
-  height: 60px;
-  max-height: 60px;
+  height: 45px;
+  max-height: 45px;
 }
 
 
 .ui-tooltip-pgbootstrap,
 textarea.bubbleInputText {
+  font-family: verdana, arial, helvetica, sans-serif;
 	font-size: 9pt;
 	line-height: 1.3em;
-
-  font-family: verdana, arial, helvetica, sans-serif;
 }
 
 
diff --git a/v3/commentary-bubbles-demo.js b/v3/commentary-bubbles-demo.js
index 01e05f9f9..ef3eaee9a 100644
--- a/v3/commentary-bubbles-demo.js
+++ b/v3/commentary-bubbles-demo.js
@@ -100,6 +100,8 @@ AnnotationBubble.prototype.showStub = function() {
   assert(this.state == 'hidden' || this.state == 'edit');
   assert(this.text == '');
 
+  var myBubble = this; // to avoid name clashes with 'this' in inner scopes
+
   // destroy then create a new tip:
   this.destroyQTip();
   $(this.hashID).qtip($.extend({}, qtipShared, {
@@ -115,12 +117,21 @@ AnnotationBubble.prototype.showStub = function() {
     }
   }));
 
+
+  $(this.qTipID())
+    .unbind('click') // unbind all old handlers
+    .click(function() {
+      myBubble.showEditor();
+    });
+
   this.state = 'stub';
 }
 
 AnnotationBubble.prototype.showEditor = function() {
   assert(this.state == 'stub' || this.state == 'view');
 
+  var myBubble = this; // to avoid name clashes with 'this' in inner scopes
+
   var ta = '';
 
   // destroy then create a new tip:
@@ -135,6 +146,20 @@ AnnotationBubble.prototype.showEditor = function() {
     }
   }));
 
+  
+  $(this.qTipContentID()).find('textarea.bubbleInputText')
+    .blur(function() { // set handler when the textarea loses focus
+      myBubble.text = $(this).val().trim(); // strip all leading and trailing spaces
+
+      if (myBubble.text) {
+        myBubble.showViewer();
+      }
+      else {
+        myBubble.showStub();
+      }
+    })
+    .focus(); // grab focus so that the user can start typing right away!
+
   this.state = 'edit';
 }
 
@@ -169,6 +194,19 @@ AnnotationBubble.prototype.restoreViewer = function() {
   this.state = 'view';
 }
 
+AnnotationBubble.prototype.enterHiddenMode = function() {
+  assert(this.state == 'stub' || this.state == 'edit');
+  this.destroyQTip();
+  this.state = 'hidden';
+}
+
+AnnotationBubble.prototype.qTipContentID = function() {
+  return '#ui-tooltip-' + this.domID + '-content';
+}
+
+AnnotationBubble.prototype.qTipID = function() {
+  return '#ui-tooltip-' + this.domID;
+}
 
 AnnotationBubble.prototype.destroyQTip = function() {
   $(this.hashID).qtip('destroy');
@@ -222,4 +260,5 @@ $(document).ready(function() {
   */
 
   x = new AnnotationBubble('frame', 'v1__stack2');
+  x.showStub();
 });

From 6386153fe6c2c4bdc2d81f3df6b22a5d5394b3ec Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 6 Oct 2012 16:10:07 -0700
Subject: [PATCH 468/502] bam

---
 v3/commentary-bubbles-demo.html |  5 +--
 v3/commentary-bubbles-demo.js   | 59 ++++++++++++++++++++++++++++++---
 2 files changed, 58 insertions(+), 6 deletions(-)

diff --git a/v3/commentary-bubbles-demo.html b/v3/commentary-bubbles-demo.html
index c94ddb9e4..1f488b2a9 100644
--- a/v3/commentary-bubbles-demo.html
+++ b/v3/commentary-bubbles-demo.html
@@ -31,11 +31,12 @@
 
 
 
- 
-
 
 
 
        
                  
              
    1def listSum(numbers):
    2  if not numbers:
    3    return 0
    4  else:
    5    (f, rest) = numbers
    6    return f + listSum(rest)
    7
    8myList = (1, (2, (3, None)))
    9total = listSum(myList)
                        
              
                                        Step 15 of 18                                  
                      
            
     line that has just executed
     next line to execute
            
            Program output:
                    
              		              
              
                
                                  
                      
    Frames
                    
    Global variables
    listSum
     
    myList
     
                    
                    
    listSum
    numbers
     
    f1
    rest
     
    listSum
    numbers
     
    f2
    rest
     
    listSum
    numbers
     
    f3
    restNone
    listSum
    numbersNone
    Return
    value    		0
                      		                              
                      
    Objects
                    
    function listSum(numbers)
    tuple
    01
    1
     
    tuple
    01
    2
     
    tuple
    01
    3None
                      		            
              
            
              		    
      
    
 
+
    
+
+
 
 
diff --git a/v3/commentary-bubbles-demo.js b/v3/commentary-bubbles-demo.js
index ef3eaee9a..e2242e21c 100644
--- a/v3/commentary-bubbles-demo.js
+++ b/v3/commentary-bubbles-demo.js
@@ -148,7 +148,8 @@ AnnotationBubble.prototype.showEditor = function() {
 
   
   $(this.qTipContentID()).find('textarea.bubbleInputText')
-    .blur(function() { // set handler when the textarea loses focus
+    // set handler when the textarea loses focus
+    .blur(function() {
       myBubble.text = $(this).val().trim(); // strip all leading and trailing spaces
 
       if (myBubble.text) {
@@ -194,7 +195,7 @@ AnnotationBubble.prototype.restoreViewer = function() {
   this.state = 'view';
 }
 
-AnnotationBubble.prototype.enterHiddenMode = function() {
+AnnotationBubble.prototype.hide = function() {
   assert(this.state == 'stub' || this.state == 'edit');
   this.destroyQTip();
   this.state = 'hidden';
@@ -212,9 +213,40 @@ AnnotationBubble.prototype.destroyQTip = function() {
   $(this.hashID).qtip('destroy');
 }
 
+AnnotationBubble.prototype.enterEditMode = function() {
+  assert(globalAnnotationMode == 'edit');
+  if (this.state == 'minimized') {
+    this.restoreViewer();
+  }
+  else if (this.state == 'hidden') {
+    this.showStub();
+  }
+}
+
+AnnotationBubble.prototype.enterViewMode = function() {
+  assert(globalAnnotationMode == 'view');
+  if (this.state == 'stub') {
+    this.hide();
+  }
+  else if (this.state == 'edit') {
+    this.text = $(this.qTipContentID()).find('textarea.bubbleInputText').val().trim(); // strip all leading and trailing spaces
+
+    if (this.text) {
+      this.showViewer();
+    }
+    else {
+      this.hide();
+    }
+  }
+}
+
 
 inputTextarea = ''
 
+globalAnnotationMode = 'view';
+
+allBubbles = [];
+
 $(document).ready(function() {
   $.fn.qtip.styles = {};
   $.fn.qtip.styles.stubStyle = {border: {color: '#999'}};
@@ -259,6 +291,25 @@ $(document).ready(function() {
                      inputTextarea, true);
   */
 
-  x = new AnnotationBubble('frame', 'v1__stack2');
-  x.showStub();
+  allBubbles.push(new AnnotationBubble('frame', 'v1__stack2'));
+
+  $('#modeToggleBtn').click(function() {
+    if (globalAnnotationMode == 'view') {
+      $('#modeToggleBtn').html('Enter View Mode');
+      globalAnnotationMode = 'edit';
+      $.each(allBubbles, function(i, e) {
+        e.enterEditMode();
+      });
+    }
+    else if (globalAnnotationMode == 'edit') {
+      $('#modeToggleBtn').html('Enter Edit Mode');
+      globalAnnotationMode = 'view';
+      $.each(allBubbles, function(i, e) {
+        e.enterViewMode();
+      });
+    }
+    else {
+      assert(false);
+    }
+  });
 });

From cee32266ad51647bc3fced29270b06e87b406681 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 6 Oct 2012 16:46:17 -0700
Subject: [PATCH 469/502] more testy

---
 v3/commentary-bubbles-demo.css |  6 +++
 v3/commentary-bubbles-demo.js  | 84 ++++++++++++++++++++++++++++++++--
 2 files changed, 86 insertions(+), 4 deletions(-)

diff --git a/v3/commentary-bubbles-demo.css b/v3/commentary-bubbles-demo.css
index 7b1916984..7c6220ef4 100644
--- a/v3/commentary-bubbles-demo.css
+++ b/v3/commentary-bubbles-demo.css
@@ -109,4 +109,10 @@ textarea.bubbleInputText {
 
 .ui-tooltip-pgbootstrap-stub{
 	border: 2px solid #999;
+
+  /*
+	-webkit-box-shadow: none;
+	-moz-box-shadow: none;
+	box-shadow: none;
+  */
 }
diff --git a/v3/commentary-bubbles-demo.js b/v3/commentary-bubbles-demo.js
index e2242e21c..2ba8e2dc8 100644
--- a/v3/commentary-bubbles-demo.js
+++ b/v3/commentary-bubbles-demo.js
@@ -164,6 +164,25 @@ AnnotationBubble.prototype.showEditor = function() {
   this.state = 'edit';
 }
 
+
+AnnotationBubble.prototype.bindViewerClickHandler = function() {
+  var myBubble = this;
+
+  $(this.qTipID())
+    .unbind('click') // unbind all old handlers
+    .click(function() {
+      if (globalAnnotationMode == 'edit') {
+        myBubble.showEditor();
+      }
+      else if (globalAnnotationMode == 'view') {
+        myBubble.minimizeViewer();
+      }
+      else {
+        assert(false);
+      }
+    });
+}
+
 AnnotationBubble.prototype.showViewer = function() {
   assert(this.state == 'edit');
   assert(this.text); // must be non-empty!
@@ -180,18 +199,32 @@ AnnotationBubble.prototype.showViewer = function() {
     }
   }));
 
+  this.bindViewerClickHandler();
   this.state = 'view';
 }
 
+
 AnnotationBubble.prototype.minimizeViewer = function() {
   assert(this.state == 'view');
-  $(this.hashID).qtip('option', 'content.text', ' ');
+
+  var myBubble = this;
+
+  $(this.hashID).qtip('option', 'content.text', ' '); //hack to "minimize" its size
+
+  $(this.qTipID())
+    .unbind('click') // unbind all old handlers
+    .click(function() {
+      assert(globalAnnotationMode == 'view');
+      myBubble.restoreViewer();
+    });
+
   this.state = 'minimized';
 }
 
 AnnotationBubble.prototype.restoreViewer = function() {
   assert(this.state == 'minimized');
   $(this.hashID).qtip('option', 'content.text', this.text);
+  this.bindViewerClickHandler();
   this.state = 'view';
 }
 
@@ -201,6 +234,11 @@ AnnotationBubble.prototype.hide = function() {
   this.state = 'hidden';
 }
 
+
+AnnotationBubble.prototype.destroyQTip = function() {
+  $(this.hashID).qtip('destroy');
+}
+
 AnnotationBubble.prototype.qTipContentID = function() {
   return '#ui-tooltip-' + this.domID + '-content';
 }
@@ -209,9 +247,6 @@ AnnotationBubble.prototype.qTipID = function() {
   return '#ui-tooltip-' + this.domID;
 }
 
-AnnotationBubble.prototype.destroyQTip = function() {
-  $(this.hashID).qtip('destroy');
-}
 
 AnnotationBubble.prototype.enterEditMode = function() {
   assert(globalAnnotationMode == 'edit');
@@ -291,7 +326,48 @@ $(document).ready(function() {
                      inputTextarea, true);
   */
 
+
+  allBubbles.push(new AnnotationBubble('frame', 'v1__globals'));
+  allBubbles.push(new AnnotationBubble('frame', 'v1__stack0'));
+  allBubbles.push(new AnnotationBubble('frame', 'v1__stack1'));
   allBubbles.push(new AnnotationBubble('frame', 'v1__stack2'));
+  allBubbles.push(new AnnotationBubble('frame', 'v1__stack3'));
+
+  allBubbles.push(new AnnotationBubble('object', 'v1__heap_object_1'));
+  allBubbles.push(new AnnotationBubble('object', 'v1__heap_object_2'));
+  allBubbles.push(new AnnotationBubble('object', 'v1__heap_object_3'));
+  allBubbles.push(new AnnotationBubble('object', 'v1__heap_object_4'));
+
+  allBubbles.push(new AnnotationBubble('codeline', 'v1__cod1'));
+  allBubbles.push(new AnnotationBubble('codeline', 'v1__cod2'));
+  allBubbles.push(new AnnotationBubble('codeline', 'v1__cod3'));
+  allBubbles.push(new AnnotationBubble('codeline', 'v1__cod4'));
+  allBubbles.push(new AnnotationBubble('codeline', 'v1__cod5'));
+  allBubbles.push(new AnnotationBubble('codeline', 'v1__cod6'));
+  allBubbles.push(new AnnotationBubble('codeline', 'v1__cod7'));
+  allBubbles.push(new AnnotationBubble('codeline', 'v1__cod8'));
+  allBubbles.push(new AnnotationBubble('codeline', 'v1__cod9'));
+
+  allBubbles.push(new AnnotationBubble('variable', 'v1__globals__listSum'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__globals__myList'));
+
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f1__numbers'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f1__f'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f1__rest'));
+
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f2__numbers'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f2__f'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f2__rest'));
+
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f3__numbers'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f3__f'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f3__rest'));
+
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f4__numbers'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f4____return__'));
+
+
+
 
   $('#modeToggleBtn').click(function() {
     if (globalAnnotationMode == 'view') {

From f24fb3908b6b1515941307d9325075b51fc6e78d Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 6 Oct 2012 16:49:45 -0700
Subject: [PATCH 470/502] twek

---
 v3/commentary-bubbles-demo.css | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/v3/commentary-bubbles-demo.css b/v3/commentary-bubbles-demo.css
index 7c6220ef4..b6d509ea7 100644
--- a/v3/commentary-bubbles-demo.css
+++ b/v3/commentary-bubbles-demo.css
@@ -8,8 +8,8 @@ textarea.bubbleInputText {
   resize: none;
   width: 200px;
   max-width: 200px;
-  height: 45px;
-  max-height: 45px;
+  height: 48px;
+  max-height: 48px;
 }
 
 

From 6a8c4aed4454f21488a252868814f16c97d57365 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 6 Oct 2012 17:12:32 -0700
Subject: [PATCH 471/502] more tweaks

---
 v3/commentary-bubbles-demo.css  | 8 ++++----
 v3/commentary-bubbles-demo.html | 2 +-
 v3/commentary-bubbles-demo.js   | 4 ++--
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/v3/commentary-bubbles-demo.css b/v3/commentary-bubbles-demo.css
index b6d509ea7..2b6581b0c 100644
--- a/v3/commentary-bubbles-demo.css
+++ b/v3/commentary-bubbles-demo.css
@@ -6,10 +6,10 @@ textarea.bubbleInputText {
 
   /* make sure textarea doesn't grow and stretch the enclosing bubble */
   resize: none;
-  width: 200px;
-  max-width: 200px;
-  height: 48px;
-  max-height: 48px;
+  width: 230px;
+  max-width: 230px;
+  height: 35px;
+  max-height: 35px;
 }
 
 
diff --git a/v3/commentary-bubbles-demo.html b/v3/commentary-bubbles-demo.html
index 1f488b2a9..b228a2e90 100644
--- a/v3/commentary-bubbles-demo.html
+++ b/v3/commentary-bubbles-demo.html
@@ -36,7 +36,7 @@
 
        
                  
              
    1def listSum(numbers):
    2  if not numbers:
    3    return 0
    4  else:
    5    (f, rest) = numbers
    6    return f + listSum(rest)
    7
    8myList = (1, (2, (3, None)))
    9total = listSum(myList)
                        
              
                                        Step 15 of 18                                  
                      
            
     line that has just executed
     next line to execute
            
            Program output:
                    
              		              
              
                
                                  
                      
    Frames
                    
    Global variables
    listSum
     
    myList
     
                    
                    
    listSum
    numbers
     
    f1
    rest
     
    listSum
    numbers
     
    f2
    rest
     
    listSum
    numbers
     
    f3
    restNone
    listSum
    numbersNone
    Return
    value    		0
                      		                              
                      
    Objects
                    
    function listSum(numbers)
    tuple
    01
    1
     
    tuple
    01
    2
     
    tuple
    01
    3None
                      		            
              
            
              		    
      
    
 
 
    
-
+
 
 
 
diff --git a/v3/commentary-bubbles-demo.js b/v3/commentary-bubbles-demo.js
index 2ba8e2dc8..8c6ff563e 100644
--- a/v3/commentary-bubbles-demo.js
+++ b/v3/commentary-bubbles-demo.js
@@ -371,14 +371,14 @@ $(document).ready(function() {
 
   $('#modeToggleBtn').click(function() {
     if (globalAnnotationMode == 'view') {
-      $('#modeToggleBtn').html('Enter View Mode');
+      $('#modeToggleBtn').html('View Annotations');
       globalAnnotationMode = 'edit';
       $.each(allBubbles, function(i, e) {
         e.enterEditMode();
       });
     }
     else if (globalAnnotationMode == 'edit') {
-      $('#modeToggleBtn').html('Enter Edit Mode');
+      $('#modeToggleBtn').html('Add/Edit Annotations');
       globalAnnotationMode = 'view';
       $.each(allBubbles, function(i, e) {
         e.enterViewMode();

From 78a6eaa6e9519f6ad53c4bb3844b200b4d223cfc Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sat, 6 Oct 2012 17:30:27 -0700
Subject: [PATCH 472/502] more robust!!!

---
 v3/commentary-bubbles-demo.css | 13 +++++++++----
 v3/commentary-bubbles-demo.js  | 18 +++++++++++-------
 2 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/v3/commentary-bubbles-demo.css b/v3/commentary-bubbles-demo.css
index 2b6581b0c..22b53bf3b 100644
--- a/v3/commentary-bubbles-demo.css
+++ b/v3/commentary-bubbles-demo.css
@@ -6,8 +6,8 @@ textarea.bubbleInputText {
 
   /* make sure textarea doesn't grow and stretch the enclosing bubble */
   resize: none;
-  width: 230px;
-  max-width: 230px;
+  width: 225px;
+  max-width: 225px;
   height: 35px;
   max-height: 35px;
 }
@@ -64,7 +64,7 @@ textarea.bubbleInputText {
 	}
 
 	.ui-tooltip-pgbootstrap .ui-tooltip-content{
-		padding: 5px /* 5px is minimum or else it might look ugly */ 7px;
+		padding: 5px /* 5px is minimum or else it might look ugly */ 8px;
 	}
 	
 
@@ -108,7 +108,7 @@ textarea.bubbleInputText {
 
 
 .ui-tooltip-pgbootstrap-stub{
-	border: 2px solid #999;
+	border: 1px solid #888;
 
   /*
 	-webkit-box-shadow: none;
@@ -116,3 +116,8 @@ textarea.bubbleInputText {
 	box-shadow: none;
   */
 }
+
+	.ui-tooltip-pgbootstrap-stub .ui-tooltip-content{
+		padding: 6px 9px;
+	}
+	
diff --git a/v3/commentary-bubbles-demo.js b/v3/commentary-bubbles-demo.js
index 8c6ff563e..10616b9f3 100644
--- a/v3/commentary-bubbles-demo.js
+++ b/v3/commentary-bubbles-demo.js
@@ -128,7 +128,7 @@ AnnotationBubble.prototype.showStub = function() {
 }
 
 AnnotationBubble.prototype.showEditor = function() {
-  assert(this.state == 'stub' || this.state == 'view');
+  assert(this.state == 'stub' || this.state == 'view' || this.state == 'minimized');
 
   var myBubble = this; // to avoid name clashes with 'this' in inner scopes
 
@@ -214,8 +214,15 @@ AnnotationBubble.prototype.minimizeViewer = function() {
   $(this.qTipID())
     .unbind('click') // unbind all old handlers
     .click(function() {
-      assert(globalAnnotationMode == 'view');
-      myBubble.restoreViewer();
+      if (globalAnnotationMode == 'edit') {
+        myBubble.showEditor();
+      }
+      else if (globalAnnotationMode == 'view') {
+        myBubble.restoreViewer();
+      }
+      else {
+        assert(false);
+      }
     });
 
   this.state = 'minimized';
@@ -250,10 +257,7 @@ AnnotationBubble.prototype.qTipID = function() {
 
 AnnotationBubble.prototype.enterEditMode = function() {
   assert(globalAnnotationMode == 'edit');
-  if (this.state == 'minimized') {
-    this.restoreViewer();
-  }
-  else if (this.state == 'hidden') {
+  if (this.state == 'hidden') {
     this.showStub();
   }
 }

From 06ca91083ca508022003add76c5a22ebb1f7be69 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 7 Oct 2012 00:16:15 -0700
Subject: [PATCH 473/502] test for limited height

---
 v3/commentary-bubbles-demo.js | 35 ++++++++++++++++++++++++++++++++---
 1 file changed, 32 insertions(+), 3 deletions(-)

diff --git a/v3/commentary-bubbles-demo.js b/v3/commentary-bubbles-demo.js
index 10616b9f3..8d1c9b6cc 100644
--- a/v3/commentary-bubbles-demo.js
+++ b/v3/commentary-bubbles-demo.js
@@ -65,6 +65,8 @@ function AnnotationBubble(type, domID) {
   this.domID = domID;
   this.hashID = '#' + domID;
 
+  this.type = type;
+
   if (type == 'codeline') {
     this.my = 'left center';
     this.at = 'right center';
@@ -256,6 +258,11 @@ AnnotationBubble.prototype.qTipID = function() {
 
 
 AnnotationBubble.prototype.enterEditMode = function() {
+  // punt if you're a codeline annotation and your line of code is hidden
+  if (this.type == 'codeline' && !isOutputLineVisible(this.domID)) {
+    return;
+  }
+
   assert(globalAnnotationMode == 'edit');
   if (this.state == 'hidden') {
     this.showStub();
@@ -263,6 +270,11 @@ AnnotationBubble.prototype.enterEditMode = function() {
 }
 
 AnnotationBubble.prototype.enterViewMode = function() {
+  // punt if you're a codeline annotation and your line of code is hidden
+  if (this.type == 'codeline' && !isOutputLineVisible(this.domID)) {
+    return;
+  }
+
   assert(globalAnnotationMode == 'view');
   if (this.state == 'stub') {
     this.hide();
@@ -286,10 +298,27 @@ globalAnnotationMode = 'view';
 
 allBubbles = [];
 
-$(document).ready(function() {
-  $.fn.qtip.styles = {};
-  $.fn.qtip.styles.stubStyle = {border: {color: '#999'}};
 
+// returns True iff lineNo is visible in pyCodeOutputDiv
+// NB: copied, pasted, and modified from isOutputLineVisible in js/pytutor.js
+function isOutputLineVisible(lineDivID) {
+  var pcod = $('#pyCodeOutputDiv');
+
+  var lineNoTd = $('#' + lineDivID);
+  var LO = lineNoTd.offset().top;
+
+  var PO = pcod.offset().top;
+  var ST = pcod.scrollTop();
+  var H = pcod.height();
+
+  // add a few pixels of fudge factor on the bottom end due to bottom scrollbar
+  return (PO <= LO) && (LO < (PO + H - 30));
+}
+
+
+$(document).ready(function() {
+  // force vertical code scrolling
+  $('#pyCodeOutputDiv').css('max-height', '120px');
 
   /*
   var listSumVisualizer = new ExecutionVisualizer('listSumDiv', listSumTrace,

From 9369fd3c1a76b6414bb1a1e2e9c3e8f40c906aaf Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Sun, 7 Oct 2012 00:22:46 -0700
Subject: [PATCH 474/502] bah

---
 v3/commentary-bubbles-demo.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/v3/commentary-bubbles-demo.js b/v3/commentary-bubbles-demo.js
index 8d1c9b6cc..abb54f7f2 100644
--- a/v3/commentary-bubbles-demo.js
+++ b/v3/commentary-bubbles-demo.js
@@ -400,6 +400,9 @@ $(document).ready(function() {
   allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f4____return__'));
 
 
+  $('#pyCodeOutputDiv').scroll(function() {
+    console.log('scrolled!!!');
+  });
 
 
   $('#modeToggleBtn').click(function() {

From a21530bf06f51e60bb13a2e5a715b0bab0d96a53 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 8 Oct 2012 15:30:39 -0700
Subject: [PATCH 475/502] got scrolling working for now

---
 v3/commentary-bubbles-demo.js | 107 ++++++++++++++--------------------
 1 file changed, 45 insertions(+), 62 deletions(-)

diff --git a/v3/commentary-bubbles-demo.js b/v3/commentary-bubbles-demo.js
index abb54f7f2..97992157a 100644
--- a/v3/commentary-bubbles-demo.js
+++ b/v3/commentary-bubbles-demo.js
@@ -9,10 +9,12 @@ var qtipShared = {
     ready: true, // show on document.ready instead of on mouseenter
     delay: 0,
     event: null,
+    effect: function() {$(this).show();}, // don't do any fancy fading because it screws up with scrolling
   },
   hide: {
     fixed: true,
     event: null,
+    effect: function() {$(this).hide();}, // don't do any fancy fading because it screws up with scrolling
   },
   style: {
     classes: 'ui-tooltip-pgbootstrap', // my own customized version of the bootstrap style
@@ -88,18 +90,20 @@ function AnnotationBubble(type, domID) {
   }
 
   // possible states:
-  //   'hidden'
+  //   'invisible'
   //   'edit'
   //   'view'
   //   'minimized'
   //   'stub'
-  this.state = 'hidden';
+  this.state = 'invisible';
 
   this.text = ''; // the actual contents of the annotation bubble
+
+  this.qtipHidden = false; // is there a qtip object present but hidden? (TODO: kinda confusing)
 }
 
 AnnotationBubble.prototype.showStub = function() {
-  assert(this.state == 'hidden' || this.state == 'edit');
+  assert(this.state == 'invisible' || this.state == 'edit');
   assert(this.text == '');
 
   var myBubble = this; // to avoid name clashes with 'this' in inner scopes
@@ -237,10 +241,11 @@ AnnotationBubble.prototype.restoreViewer = function() {
   this.state = 'view';
 }
 
-AnnotationBubble.prototype.hide = function() {
+// NB: actually DESTROYS the QTip object
+AnnotationBubble.prototype.makeInvisible = function() {
   assert(this.state == 'stub' || this.state == 'edit');
   this.destroyQTip();
-  this.state = 'hidden';
+  this.state = 'invisible';
 }
 
 
@@ -258,44 +263,58 @@ AnnotationBubble.prototype.qTipID = function() {
 
 
 AnnotationBubble.prototype.enterEditMode = function() {
-  // punt if you're a codeline annotation and your line of code is hidden
-  if (this.type == 'codeline' && !isOutputLineVisible(this.domID)) {
-    return;
-  }
-
   assert(globalAnnotationMode == 'edit');
-  if (this.state == 'hidden') {
+  if (this.state == 'invisible') {
     this.showStub();
+
+    if (this.type == 'codeline') {
+      this.redrawCodelineBubble();
+    }
   }
 }
 
 AnnotationBubble.prototype.enterViewMode = function() {
-  // punt if you're a codeline annotation and your line of code is hidden
-  if (this.type == 'codeline' && !isOutputLineVisible(this.domID)) {
-    return;
-  }
-
   assert(globalAnnotationMode == 'view');
   if (this.state == 'stub') {
-    this.hide();
+    this.makeInvisible();
   }
   else if (this.state == 'edit') {
     this.text = $(this.qTipContentID()).find('textarea.bubbleInputText').val().trim(); // strip all leading and trailing spaces
 
     if (this.text) {
       this.showViewer();
+
+      if (this.type == 'codeline') {
+        this.redrawCodelineBubble();
+      }
     }
     else {
-      this.hide();
+      this.makeInvisible();
     }
   }
 }
 
+AnnotationBubble.prototype.redrawCodelineBubble = function() {
+  assert(this.type == 'codeline');
 
-inputTextarea = ''
+  if (isOutputLineVisible(this.domID)) {
+    if (this.qtipHidden) {
+      $(this.hashID).qtip('show');
+    }
+    else {
+      $(this.hashID).qtip('reposition');
+    }
 
-globalAnnotationMode = 'view';
+    this.qtipHidden = false;
+  }
+  else {
+    $(this.hashID).qtip('hide');
+    this.qtipHidden = true;
+  }
+}
 
+
+globalAnnotationMode = 'view';
 allBubbles = [];
 
 
@@ -312,7 +331,7 @@ function isOutputLineVisible(lineDivID) {
   var H = pcod.height();
 
   // add a few pixels of fudge factor on the bottom end due to bottom scrollbar
-  return (PO <= LO) && (LO < (PO + H - 30));
+  return (PO <= LO) && (LO < (PO + H - 25));
 }
 
 
@@ -320,46 +339,6 @@ $(document).ready(function() {
   // force vertical code scrolling
   $('#pyCodeOutputDiv').css('max-height', '120px');
 
-  /*
-  var listSumVisualizer = new ExecutionVisualizer('listSumDiv', listSumTrace,
-                                                  {embeddedMode: false,
-                                                   editCodeBaseURL: 'http://pythontutor.com/visualize.html'});
-  */
-
-  /*
-  createSpeechBubble('v1__heap_object_1', 'bottom left', 'top center',
-                     "Here's a function!");
-
-  createSpeechBubble('v1__heap_object_2', 'bottom left', 'top center',
-                     'This is the head of our linked list.');
-
-  createSpeechBubble('v1__heap_object_4', 'bottom left', 'top center',
-                     'This is the final element of our linked list. Its car is 3 and cdr is None');
-
-
-  createSpeechBubble('v1__stack0', 'right center', 'left center',
-                     "The first of several recursive calls.");
-
-  createSpeechBubble('v1__cod4', 'left center', 'right center',
-                     "line four, booooooooooooo ...");
-
-  createSpeechBubble('v1__cod5', 'left center', 'right center',
-                     "line five, yay!!!");
-
-  createSpeechBubble('v1__cod9', 'left center', 'right center',
-                     "line nine, yay!!!");
-
-  createSpeechBubble('v1__listSum_f2__numbers', 'right center', 'left center',
-                     "this is a variable, of course!");
-
-  createSpeechBubble('v1__listSum_f2__rest', 'right center', 'left center',
-                     "this is another variable, of course; what else would it be?!?");
-
-  createSpeechBubble('v1__stack2', 'right center', 'left center',
-                     inputTextarea, true);
-  */
-
-
   allBubbles.push(new AnnotationBubble('frame', 'v1__globals'));
   allBubbles.push(new AnnotationBubble('frame', 'v1__stack0'));
   allBubbles.push(new AnnotationBubble('frame', 'v1__stack1'));
@@ -401,7 +380,11 @@ $(document).ready(function() {
 
 
   $('#pyCodeOutputDiv').scroll(function() {
-    console.log('scrolled!!!');
+    $.each(allBubbles, function(i, e) {
+      if (e.type == 'codeline') {
+        e.redrawCodelineBubble();
+      }
+    });
   });
 
 

From 89205f3cfc192bda94211419c8e9dddc7eb3cd7c Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 8 Oct 2012 15:54:08 -0700
Subject: [PATCH 476/502] marching forward

---
 v3/commentary-bubbles-demo.css  | 45 +++++++++++++++++++++++++++++++++
 v3/commentary-bubbles-demo.html | 18 ++++++++++---
 v3/commentary-bubbles-demo.js   |  8 ++++++
 v3/css/pytutor.css              |  4 +++
 4 files changed, 71 insertions(+), 4 deletions(-)

diff --git a/v3/commentary-bubbles-demo.css b/v3/commentary-bubbles-demo.css
index 22b53bf3b..67d1b405d 100644
--- a/v3/commentary-bubbles-demo.css
+++ b/v3/commentary-bubbles-demo.css
@@ -1,3 +1,48 @@
+body {
+  background-color: white;
+
+  font-family: verdana, arial, helvetica, sans-serif;
+
+  font-size: 10pt;
+
+  margin-top:  30px;
+  margin-left: 30px;
+
+  /* center align */
+  /*
+  max-width: 1000px;
+  margin-left: auto;
+  margin-right: auto;
+  */
+}
+
+
+div#lessonHeader {
+  margin-bottom: 10px;
+  padding-bottom: 10px;
+  border-bottom: 1px solid #ccc;
+  width: 800px;
+}
+
+div#lessonTitle {
+  font-size: 16pt;
+  margin-bottom: 15pt;
+}
+
+div#lessonDescription {
+  font-size: 11pt;
+  line-height: 1.5em;
+}
+
+div#curStepNarration {
+  font-size: 11pt;
+  min-height: 60px;
+  margin-bottom: 12px;
+  line-height: 1.5em;
+  width: 800px;
+}
+
+
 /* For styling tricks, see: http://css-tricks.com/textarea-tricks/ */
 textarea.bubbleInputText {
   border: 1px solid #ccc;
diff --git a/v3/commentary-bubbles-demo.html b/v3/commentary-bubbles-demo.html
index b228a2e90..5f6b1d928 100644
--- a/v3/commentary-bubbles-demo.html
+++ b/v3/commentary-bubbles-demo.html
@@ -30,13 +30,23 @@
 
 
 
+
    
+  
    Linked List Recursion Example
    
+  
    This code shows a function that sums up
+  the elements of a linked list using recursion.
    
+
    
 
-
+
    At the current step, the program is about to
+return from the base case of the recursion, which returns 0 to its
+caller.
+
    
+
+
    
 
-
        
                  
              
    1def listSum(numbers):
    2  if not numbers:
    3    return 0
    4  else:
    5    (f, rest) = numbers
    6    return f + listSum(rest)
    7
    8myList = (1, (2, (3, None)))
    9total = listSum(myList)
                        
              
                                        Step 15 of 18                                  
                      
            
     line that has just executed
     next line to execute
            
            Program output:
                    
              		              
              
                
                                  
                      
    Frames
                    
    Global variables
    listSum
     
    myList
     
                    
                    
    listSum
    numbers
     
    f1
    rest
     
    listSum
    numbers
     
    f2
    rest
     
    listSum
    numbers
     
    f3
    restNone
    listSum
    numbersNone
    Return
    value    		0
                      		                              
                      
    Objects
                    
    function listSum(numbers)
    tuple
    01
    1
     
    tuple
    01
    2
     
    tuple
    01
    3None
                      		            
              
            
              		    
      
    
 
-
    
-
+
+
+
        
                  
              
    1def listSum(numbers):
    2  if not numbers:
    3    return 0
    4  else:
    5    (f, rest) = numbers
    6    return f + listSum(rest)
    7
    8myList = (1, (2, (3, None)))
    9total = listSum(myList)
                        
              
                                        Step 15 of 18                                  
                      
            
     line that has just executed
     next line to execute
            
            Program output:
                    
              		              
              
                
                                  
                      
    Frames
                    
    Global variables
    listSum
     
    myList
     
                    
                    
    listSum
    numbers
     
    f1
    rest
     
    listSum
    numbers
     
    f2
    rest
     
    listSum
    numbers
     
    f3
    restNone
    listSum
    numbersNone
    Return
    value    		0
                      		                              
                      
    Objects
                    
    function listSum(numbers)
    tuple
    01
    1
     
    tuple
    01
    2
     
    tuple
    01
    3None
                      		            
              
            
              		    
      
    
 
 
 
diff --git a/v3/commentary-bubbles-demo.js b/v3/commentary-bubbles-demo.js
index 97992157a..b6406f704 100644
--- a/v3/commentary-bubbles-demo.js
+++ b/v3/commentary-bubbles-demo.js
@@ -336,6 +336,14 @@ function isOutputLineVisible(lineDivID) {
 
 
 $(document).ready(function() {
+  /*
+  var listSumVisualizer = new ExecutionVisualizer('listSumDiv', listSumTrace,
+                                                  {embeddedMode: false,
+                                                   editCodeBaseURL: 'http://pythontutor.com/visualize.html'});
+
+  return;
+  */
+
   // force vertical code scrolling
   $('#pyCodeOutputDiv').css('max-height', '120px');
 
diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 6c7dda325..8d0924347 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -160,6 +160,10 @@ div.ExecutionVisualizer #pyStdout {
   font-size: 12pt;
   padding: 4px;
   font-family: Andale mono, monospace;
+
+  overflow: auto; /* to look pretty on IE */
+  /* make sure textarea doesn't grow and stretch */
+  resize: none;
 }
 
 

From 4e66a22a68fe0837297b143300c45e933bcb3b3f Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 9 Oct 2012 14:06:10 -0700
Subject: [PATCH 477/502] teeny color tweak

---
 v3/commentary-bubbles-demo.css | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/commentary-bubbles-demo.css b/v3/commentary-bubbles-demo.css
index 67d1b405d..75ceea3ab 100644
--- a/v3/commentary-bubbles-demo.css
+++ b/v3/commentary-bubbles-demo.css
@@ -153,7 +153,7 @@ textarea.bubbleInputText {
 
 
 .ui-tooltip-pgbootstrap-stub{
-	border: 1px solid #888;
+	border: 1px solid #999;
 
   /*
 	-webkit-box-shadow: none;

From d86fa76cd7f0ae38d27dbec74b9b71e402ddeb17 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 9 Oct 2012 16:18:19 -0700
Subject: [PATCH 478/502] =?UTF-8?q?add=20a=20new=C2=A0verticalStack=20para?=
 =?UTF-8?q?meter=20option=20to=20stack=20the=20code=20and=20visualization?=
 =?UTF-8?q?=20=20atop=20one=20another,=20along=20with=20codeDivHeight=20an?=
 =?UTF-8?q?d=20codeDivWidth=20options=20=20to=20adjust=20the=20height=20an?=
 =?UTF-8?q?d=20width,=20respectively,=20of=20the=20code=20display=20div?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 v3/css/pytutor.css   |  14 ++++-
 v3/embedding-demo.js |   6 ++
 v3/js/pytutor.js     | 141 ++++++++++++++++++++++++-------------------
 3 files changed, 97 insertions(+), 64 deletions(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index 8d0924347..b1dfd935a 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -55,12 +55,19 @@ div.ExecutionVisualizer #dataViz {
   margin-left: 30px;
 }
 
+div.ExecutionVisualizer div#codeDisplayDiv {
+  width: 550px;
+}
+
 div.ExecutionVisualizer div#pyCodeOutputDiv {
   max-width: 550px;
   max-height: 450px;
   /*max-height: 620px;*/
   overflow: auto;
   /*margin-bottom: 4px;*/
+
+  margin-left: auto;
+  margin-right: auto;
 }
 
 div.ExecutionVisualizer table#pyCodeOutput {
@@ -126,7 +133,7 @@ div.ExecutionVisualizer div#editCodeLinkDiv {
   margin-top: 12px;
   margin-bottom: 4px;
   */
-  margin: 6px auto;
+  margin: 8px auto;
 }
 
 div.ExecutionVisualizer #errorOutput {
@@ -141,7 +148,7 @@ div.ExecutionVisualizer #errorOutput {
 
 div.ExecutionVisualizer #vcrControls {
   margin: 15px auto;
-  width: 100%;
+  /*width: 100%;*/
   text-align: center;
 }
 
@@ -465,6 +472,9 @@ div.ExecutionVisualizer #executionSlider {
   width: 500px;
   margin-top: 15px;
   margin-bottom: 5px;
+
+  margin-left: auto;
+  margin-right: auto;
 }
 
 div.ExecutionVisualizer #executionSliderCaption {
diff --git a/v3/embedding-demo.js b/v3/embedding-demo.js
index 9af98dbc6..584e92eaa 100644
--- a/v3/embedding-demo.js
+++ b/v3/embedding-demo.js
@@ -40,9 +40,13 @@ $(document).ready(function() {
   // The "startingInstruction: 15" optional parameter means to jump to step 15
   // in the visualization when it loads. (The HTML webpage will actually display
   // "Step 16 of 64" since indices are zero-indexed.)
+  //
+  // verticalStack means to stack the code and visualizations vertically atop one another
+  // (rather than side-by-side)
   var hanoiVisualizer   = new ExecutionVisualizer('hanoiDiv', hanoiTrace,
                                                   {embeddedMode: true,
                                                    startingInstruction: 15,
+                                                   verticalStack: true,
                                                    editCodeBaseURL: 'http://pythontutor.com/visualize.html'});
 
   // "embeddedMode: false" displays the full visualizer widget with the "Program Output" pane
@@ -50,6 +54,8 @@ $(document).ready(function() {
   var happyVisualizer   = new ExecutionVisualizer('happyDiv', happyTrace,
                                                   {embeddedMode: false,
                                                    jumpToEnd: true,
+                                                   codeDivWidth: 450,
+                                                   codeDivHeight: 150,
                                                    editCodeBaseURL: 'http://pythontutor.com/visualize.html'});
 
 
diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 2925f8fae..827947a46 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -68,13 +68,16 @@ var curVisualizerID = 1; // global to uniquely identify each ExecutionVisualizer
 // params contains optional parameters, such as:
 //   jumpToEnd - if non-null, jump to the very end of execution
 //   startingInstruction - the (zero-indexed) execution point to display upon rendering
-//   hideOutput - hide "Program output" and "Generate URL" displays
-//   codeDivHeight - maximum height of #pyCodeOutputDiv (in pixels)
+//   hideOutput - hide "Program output" display
+//   codeDivHeight - maximum height of #pyCodeOutputDiv (in integer pixels)
+//   codeDivWidth  - maximum width  of #pyCodeOutputDiv (in integer pixels)
 //   editCodeBaseURL - the base URL to visit when the user clicks 'Edit code'
 //   embeddedMode - make the widget narrower horizontally and disable breakpoints
 //   updateOutputCallback - function to call (with 'this' as parameter)
 //                          whenever this.updateOutput() is called
 //                          (BEFORE rendering the output display)
+//   verticalStack - if true, then stack code display ON TOP of visualization
+//                   (else place side-by-side)
 function ExecutionVisualizer(domRootID, dat, params) {
   this.curInputCode = dat.code.rtrim(); // kill trailing spaces
   this.curTrace = dat.trace;
@@ -90,6 +93,9 @@ function ExecutionVisualizer(domRootID, dat, params) {
   this.curInstr = 0;
 
   this.params = params;
+  if (!this.params) {
+    this.params = {}; // make it an empty object by default
+  }
 
   // needs to be unique!
   this.visualizerID = curVisualizerID;
@@ -170,54 +176,56 @@ ExecutionVisualizer.prototype.render = function() {
 
   var myViz = this; // to prevent confusion of 'this' inside of nested functions
 
-  // TODO: make less gross!
-  this.domRoot.html(
-  '\
-    \
-      \
-      \
-    \
-  
    \
-        
    \
-          
    \
-          
    \
-            Edit code\
-          
    \
-          
    \
-          
    \
-            \
-            \
-            Step ? of ?\
-            \
-            \
-          
    \
-          
    \
-        
    \
-        
    \
-        
    \
-        Program output:
    \
-        \
-        
    \
-      
    		\
-        
    \
-          \
-            \
-              \
-              \
-            \
-          
    \
-                
    \
-                  
    Frames
    \
-                
    \
-                
    \
-                
    \
-                  		\
-                
    \
-                  
    Objects
    \
-                
    \
-              
    \
-        
    \
-      
    ');
+  var codeDisplayHTML = 
+    '
    \
+       
    \
+       \
+       
    \
+       
    \
+         \
+         \
+         Step ? of ?\
+         \
+         \
+       
    \
+       
    \
+       
    \
+       
    \
+         Program output:
    \
+         \
+       
    \
+     
    ';
+
+  var codeVizHTML =
+    '
    \
+       \
+         \
+           \
+           \
+         \
+       
    \
+             
    \
+               
    Frames
    \
+             
    \
+             
    \
+               		\
+             
    \
+               
    Objects
    \
+             
    \
+           
    \
+     
    ';
+
+
+  if (this.params.verticalStack) {
+    this.domRoot.html('
    ' +
+                      codeDisplayHTML + '
    ' +
+                      codeVizHTML + '
    ');
+  }
+  else {
+    this.domRoot.html('
    ' +
+                      codeDisplayHTML + '' +
+                      codeVizHTML + '
    ');
+  }
 
 
   this.domRoot.find('#legendDiv')
@@ -250,16 +258,30 @@ ExecutionVisualizer.prototype.render = function() {
   if (this.params.embeddedMode) {
     this.params.hideOutput = true; // put this before hideOutput handler
 
-    this.domRoot.find('#executionSlider')
-      .css('width', '330px');
+    this.params.codeDivWidth = 350;
+    this.params.codeDivHeight = 400;
+  }
 
+  
+  // not enough room for these extra buttons ...
+  if (this.params.codeDivWidth &&
+      this.params.codeDivWidth < 470) {
     this.domRoot.find('#jmpFirstInstr').hide();
     this.domRoot.find('#jmpLastInstr').hide();
+  }
 
-    this.domRoot.find('#pyCodeOutputDiv')
-      .css('max-width', '350px')
-      .css('max-height', '400px');
 
+  if (this.params.codeDivWidth) {
+    this.domRoot.find('#pyCodeOutputDiv,#codeDisplayDiv,#pyStdout')
+      .css('max-width', this.params.codeDivWidth + 'px');
+
+    this.domRoot.find('#executionSlider')
+      .css('width', (this.params.codeDivWidth - 20) + 'px');
+  }
+
+  if (this.params.codeDivHeight) {
+    this.domRoot.find('#pyCodeOutputDiv')
+      .css('max-height', this.params.codeDivHeight + 'px');
   }
 
 
@@ -271,12 +293,7 @@ ExecutionVisualizer.prototype.render = function() {
     + myViz.generateID('global_table') + '">
    ');
 
 
-  if (this.params && this.params.codeDivHeight) {
-    this.domRoot.find('#pyCodeOutputDiv').css('max-height', this.params.codeDivHeight);
-  }
-
-
-  if (this.params && this.params.hideOutput) {
+  if (this.params.hideOutput) {
     this.domRoot.find('#progOutputs').hide();
   }
 
@@ -341,7 +358,7 @@ ExecutionVisualizer.prototype.render = function() {
   });
 
 
-  if (this.params && this.params.startingInstruction) {
+  if (this.params.startingInstruction) {
     assert(0 <= this.params.startingInstruction &&
            this.params.startingInstruction < this.curTrace.length);
     this.curInstr = this.params.startingInstruction;

From aa3b4bb409c7d12e1c380f590012679792d91d90 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 9 Oct 2012 16:54:07 -0700
Subject: [PATCH 479/502] avoid a SUBTLE DOM ID name clash!!!

---
 v3/js/pytutor.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 827947a46..1a67b488d 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -1774,7 +1774,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .enter()
     .append('tr')
     .attr('id', function(d, i) {
-        return myViz.generateID(varnameToCssID('globals__' + d)); // make globally unique (within the page)
+        return myViz.generateID(varnameToCssID('global__' + d + '_tr')); // make globally unique (within the page)
     });
 
 
@@ -1936,7 +1936,7 @@ ExecutionVisualizer.prototype.renderDataStructures = function() {
     .enter()
     .append('tr')
     .attr('id', function(d, i) {
-        return myViz.generateID(varnameToCssID(d.frame.unique_hash + '__' + d.varname)); // make globally unique (within the page)
+        return myViz.generateID(varnameToCssID(d.frame.unique_hash + '__' + d.varname + '_tr')); // make globally unique (within the page)
     });
  
 

From 27f1606742f7831291f19782581c4f31c10eca53 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 9 Oct 2012 16:57:53 -0700
Subject: [PATCH 480/502] updated demo accordingly

---
 v3/commentary-bubbles-demo.html |  2 +-
 v3/commentary-bubbles-demo.js   | 26 +++++++++++++-------------
 2 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/v3/commentary-bubbles-demo.html b/v3/commentary-bubbles-demo.html
index 5f6b1d928..dc650cbb8 100644
--- a/v3/commentary-bubbles-demo.html
+++ b/v3/commentary-bubbles-demo.html
@@ -46,7 +46,7 @@
 
 
 
-
        
                  
              
    1def listSum(numbers):
    2  if not numbers:
    3    return 0
    4  else:
    5    (f, rest) = numbers
    6    return f + listSum(rest)
    7
    8myList = (1, (2, (3, None)))
    9total = listSum(myList)
                        
              
                                        Step 15 of 18                                  
                      
            
     line that has just executed
     next line to execute
            
            Program output:
                    
              		              
              
                
                                  
                      
    Frames
                    
    Global variables
    listSum
     
    myList
     
                    
                    
    listSum
    numbers
     
    f1
    rest
     
    listSum
    numbers
     
    f2
    rest
     
    listSum
    numbers
     
    f3
    restNone
    listSum
    numbersNone
    Return
    value    		0
                      		                              
                      
    Objects
                    
    function listSum(numbers)
    tuple
    01
    1
     
    tuple
    01
    2
     
    tuple
    01
    3None
                      		            
              
            
              		    
      
    
+
           
    1def listSum(numbers):
    2  if not numbers:
    3    return 0
    4  else:
    5    (f, rest) = numbers
    6    return f + listSum(rest)
    7
    8myList = (1, (2, (3, None)))
    9total = listSum(myList)
                  
           
                               Step 15 of 18                         
                  
     line that has just executed
     next line to execute
           
             Program output:
                    
         
           
             
                            
                   
    Frames
                 
    Global variables
    listSum
     
    myList
     
                 
    listSum
    numbers
     
    f1
    rest
     
    listSum
    numbers
     
    f2
    rest
     
    listSum
    numbers
     
    f3
    restNone
    listSum
    numbersNone
    Return
    value    		0
                   		                        
                   
    Objects
                 
    function listSum(numbers)
    tuple
    01
    1
     
    tuple
    01
    2
     
    tuple
    01
    3None
                   		         
           
         
    
 
 
 
diff --git a/v3/commentary-bubbles-demo.js b/v3/commentary-bubbles-demo.js
index b6406f704..edace49e0 100644
--- a/v3/commentary-bubbles-demo.js
+++ b/v3/commentary-bubbles-demo.js
@@ -368,23 +368,23 @@ $(document).ready(function() {
   allBubbles.push(new AnnotationBubble('codeline', 'v1__cod8'));
   allBubbles.push(new AnnotationBubble('codeline', 'v1__cod9'));
 
-  allBubbles.push(new AnnotationBubble('variable', 'v1__globals__listSum'));
-  allBubbles.push(new AnnotationBubble('variable', 'v1__globals__myList'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__global__listSum_tr'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__global__myList_tr'));
 
-  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f1__numbers'));
-  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f1__f'));
-  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f1__rest'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f1__numbers_tr'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f1__f_tr'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f1__rest_tr'));
 
-  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f2__numbers'));
-  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f2__f'));
-  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f2__rest'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f2__numbers_tr'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f2__f_tr'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f2__rest_tr'));
 
-  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f3__numbers'));
-  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f3__f'));
-  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f3__rest'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f3__numbers_tr'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f3__f_tr'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f3__rest_tr'));
 
-  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f4__numbers'));
-  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f4____return__'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f4__numbers_tr'));
+  allBubbles.push(new AnnotationBubble('variable', 'v1__listSum_f4____return___tr'));
 
 
   $('#pyCodeOutputDiv').scroll(function() {

From 9f539313234eea694f9f46d66ad9bd4739cef631 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 9 Oct 2012 18:22:56 -0700
Subject: [PATCH 481/502] added a heightChangeCallback optional parameter to
 ExecutionVisualizer, which is a function to call whenever the HEIGHT of
 #dataViz changes

---
 v3/embedding-demo.js | 57 ++++++++++++++++++++++----------------------
 v3/js/pytutor.js     | 13 ++++++++++
 2 files changed, 42 insertions(+), 28 deletions(-)

diff --git a/v3/embedding-demo.js b/v3/embedding-demo.js
index 584e92eaa..2a045fb4b 100644
--- a/v3/embedding-demo.js
+++ b/v3/embedding-demo.js
@@ -32,9 +32,31 @@ $(document).ready(function() {
   // Note that "embeddedMode: true" makes the visualizer appear more compact on-screen.
   // editCodeBaseURL is the base URL to prepend onto the 'Edit code' link.
 
+
+  // A more subtle point is that when some div in your HTML webpage
+  // (such as a visualizer div) expands in height, it will "push down"
+  // all divs below it, but the SVG arrows rendered by jsPlumb
+  // WILL NOT MOVE. Thus, they will be in the incorrect location
+  // unless you call redrawAllConnectors().
+  //
+  // We use the "heightChangeCallback: redrawAllConnectors" optional parameter
+  // to force redraw of all SVG arrows of visualizers BELOW the current one whenever
+  // its height changes.
+  //
+  // Alternatively, here is one jQuery plugin that you can use to detect div height changes:
+  // http://benalman.com/projects/jquery-resize-plugin/
+  //
+  // A related trick you can implement is to make a div never shrink in height once it's grown;
+  // that way, you can avoid lots of jarring jumps and (inefficient) redraws.
+
   // Render listSumTrace inside of listSumDiv
   var listSumVisualizer = new ExecutionVisualizer('listSumDiv', listSumTrace,
                                                   {embeddedMode: true,
+                                                   heightChangeCallback: function() {
+                                                     // note that these might not exist during a callback ...
+                                                     if (hanoiVisualizer) {hanoiVisualizer.redrawConnectors();}
+                                                     if (happyVisualizer) {happyVisualizer.redrawConnectors();}
+                                                   },
                                                    editCodeBaseURL: 'http://pythontutor.com/visualize.html'});
 
   // The "startingInstruction: 15" optional parameter means to jump to step 15
@@ -47,6 +69,9 @@ $(document).ready(function() {
                                                   {embeddedMode: true,
                                                    startingInstruction: 15,
                                                    verticalStack: true,
+                                                   heightChangeCallback: function() {
+                                                     if (happyVisualizer) {happyVisualizer.redrawConnectors();}
+                                                   },
                                                    editCodeBaseURL: 'http://pythontutor.com/visualize.html'});
 
   // "embeddedMode: false" displays the full visualizer widget with the "Program Output" pane
@@ -59,37 +84,13 @@ $(document).ready(function() {
                                                    editCodeBaseURL: 'http://pythontutor.com/visualize.html'});
 
 
-  // The redrawConnectors() method needs to be called whenever
-  // HTML elements move around on-screen. This is because the SVG
-  // arrows rendered by jsPlumb don't automatically get redrawn
-  // in their new positions unless redrawConnectors() is called.
-
-  // Call redrawConnectors() whenever the window is resized,
-  // since HTML elements might have moved during a resize.
+  // Call redrawConnectors() on all visualizers whenever the window is resized,
+  // since HTML elements might have moved during a resize. The SVG arrows rendered
+  // by jsPlumb don't automatically get re-drawn in their new positions unless
+  // redrawConnectors() is called.
   $(window).resize(function() {
     listSumVisualizer.redrawConnectors();
     hanoiVisualizer.redrawConnectors();
     happyVisualizer.redrawConnectors();
   });
-
-
-  // A more subtle point is that when some div in your HTML webpage
-  // (such as a visualizer div) expands in height, it will "push down"
-  // all divs below it, but the SVG arrows rendered by jsPlumb
-  // WILL NOT MOVE. Thus, they will be in the incorrect location,
-  // unless you call redrawConnectors(). Here is one jQuery plugin
-  // that you can use to detect div height changes:
-  //
-  // http://benalman.com/projects/jquery-resize-plugin/
-  //
-  // As a concrete example, drag around the execution slider in
-  // "Towers of Hanoi" and notice how the arrows in "Happy Birthday"
-  // end up not properly aligned with the other elements.
-  //
-  // A related trick you can implement is to make a div never shrink
-  // in height once it's grown; that way, you can avoid lots of jarring
-  // jumps and redraws.
-  //
-  // Please email me if you want me to add more official support
-  // for this behavior.
 });
diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 1a67b488d..717752235 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -76,6 +76,8 @@ var curVisualizerID = 1; // global to uniquely identify each ExecutionVisualizer
 //   updateOutputCallback - function to call (with 'this' as parameter)
 //                          whenever this.updateOutput() is called
 //                          (BEFORE rendering the output display)
+//   heightChangeCallback - function to call (with 'this' as parameter)
+//                          whenever the HEIGHT of #dataViz changes
 //   verticalStack - if true, then stack code display ON TOP of visualization
 //                   (else place side-by-side)
 function ExecutionVisualizer(domRootID, dat, params) {
@@ -773,6 +775,8 @@ ExecutionVisualizer.prototype.updateOutput = function(smoothTransition) {
     return;
   }
 
+  var prevDataVizHeight = myViz.domRoot.find('#dataViz').height();
+
 
   var gutterSVG = myViz.domRoot.find('svg#leftCodeGutterSVG');
 
@@ -1048,6 +1052,15 @@ ExecutionVisualizer.prototype.updateOutput = function(smoothTransition) {
 
   // finally, render all of the data structures
   this.renderDataStructures();
+
+
+  // call the callback if necessary (BEFORE rendering)
+  if (this.params.heightChangeCallback) {
+    if (myViz.domRoot.find('#dataViz').height() != prevDataVizHeight) {
+      this.params.heightChangeCallback(this);
+    }
+  }
+
 }
 
 

From b49816941920343de656a3dd8a68a425f6e30c00 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 9 Oct 2012 18:37:34 -0700
Subject: [PATCH 482/502] added a exec_script_str_local that should only be
 used when running locally, which disables security checks and returns the
 result of the finalizer function

---
 v3/generate_json_trace.py |  8 ++++----
 v3/pg_logger.py           | 22 +++++++++++++++++++---
 2 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/v3/generate_json_trace.py b/v3/generate_json_trace.py
index af3c336fa..08f44bb46 100644
--- a/v3/generate_json_trace.py
+++ b/v3/generate_json_trace.py
@@ -13,13 +13,13 @@
 def json_finalizer(input_code, output_trace):
   ret = dict(code=input_code, trace=output_trace)
   json_output = json.dumps(ret, indent=INDENT_LEVEL)
-  print(json_output)
+  return json_output
 
 def js_var_finalizer(input_code, output_trace):
   global JS_VARNAME
   ret = dict(code=input_code, trace=output_trace)
   json_output = json.dumps(ret, indent=None)
-  print("var %s = %s;" % (JS_VARNAME, json_output))
+  return "var %s = %s;" % (JS_VARNAME, json_output)
 
 parser = OptionParser(usage="Generate JSON trace for pytutor")
 parser.add_option('-c', '--cumulative', default=False, action='store_true',
@@ -35,6 +35,6 @@ def js_var_finalizer(input_code, output_trace):
 
 if options.js_varname:
   JS_VARNAME = options.js_varname
-  pg_logger.exec_script_str(fin.read(), options.cumulative, js_var_finalizer)
+  print(pg_logger.exec_script_str_local(fin.read(), options.cumulative, js_var_finalizer))
 else:
-  pg_logger.exec_script_str(fin.read(), options.cumulative, json_finalizer)
+  print(pg_logger.exec_script_str_local(fin.read(), options.cumulative, json_finalizer))
diff --git a/v3/pg_logger.py b/v3/pg_logger.py
index ce8a477d5..e573398bb 100644
--- a/v3/pg_logger.py
+++ b/v3/pg_logger.py
@@ -188,11 +188,13 @@ def visit_function_obj(v, ids_seen_set):
 
 class PGLogger(bdb.Bdb):
 
-    def __init__(self, cumulative_mode, finalizer_func):
+    def __init__(self, cumulative_mode, finalizer_func, disable_security_checks=False):
         bdb.Bdb.__init__(self)
         self.mainpyfile = ''
         self._wait_for_mainpyfile = 0
 
+        self.disable_security_checks = disable_security_checks
+
         # a function that takes the output trace as a parameter and
         # processes it
         self.finalizer_func = finalizer_func
@@ -746,7 +748,7 @@ def _runscript(self, script_str):
           # memory bombs such as:
           #   x = 2
           #   while True: x = x*x
-          if resource_module_loaded:
+          if resource_module_loaded and (not self.disable_security_checks):
             resource.setrlimit(resource.RLIMIT_AS, (200000000, 200000000))
             resource.setrlimit(resource.RLIMIT_CPU, (5, 5))
 
@@ -839,7 +841,7 @@ def finalize(self):
 
       self.trace = res
 
-      self.finalizer_func(self.executed_script, self.trace)
+      return self.finalizer_func(self.executed_script, self.trace)
 
 
 
@@ -854,3 +856,17 @@ def exec_script_str(script_str, cumulative_mode, finalizer_func):
   finally:
     logger.finalize()
 
+
+# disables security check and returns the result of finalizer_func
+# WARNING: ONLY RUN THIS LOCALLY and never over the web, since
+# security checks are disabled
+def exec_script_str_local(script_str, cumulative_mode, finalizer_func):
+  logger = PGLogger(cumulative_mode, finalizer_func, disable_security_checks=True)
+
+  try:
+    logger._runscript(script_str)
+  except bdb.BdbQuit:
+    pass
+  finally:
+    return logger.finalize()
+

From 87f9014d8d20d31cbff707a52921a38d9ab602be Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Tue, 9 Oct 2012 18:42:36 -0700
Subject: [PATCH 483/502] minor comment update

---
 v3/embedding-demo.js | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/v3/embedding-demo.js b/v3/embedding-demo.js
index 2a045fb4b..4224b17e0 100644
--- a/v3/embedding-demo.js
+++ b/v3/embedding-demo.js
@@ -39,9 +39,8 @@ $(document).ready(function() {
   // WILL NOT MOVE. Thus, they will be in the incorrect location
   // unless you call redrawAllConnectors().
   //
-  // We use the "heightChangeCallback: redrawAllConnectors" optional parameter
-  // to force redraw of all SVG arrows of visualizers BELOW the current one whenever
-  // its height changes.
+  // We use the "heightChangeCallback" optional parameter to force redraw of all SVG arrows
+  // of visualizers BELOW the current one, whenever its height changes.
   //
   // Alternatively, here is one jQuery plugin that you can use to detect div height changes:
   // http://benalman.com/projects/jquery-resize-plugin/

From b4b4c5ff598cca6e097e48a12eefdc37c1f3489a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 10 Oct 2012 14:23:17 -0700
Subject: [PATCH 484/502] start adding iframe support

---
 v3/iframe-embed-demo.html |  11 ++++
 v3/iframe-embed.html      |  30 +++++++++
 v3/js/iframe-embed.js     | 127 ++++++++++++++++++++++++++++++++++++++
 v3/js/opt-frontend.js     |  22 ++++++-
 v3/pythontutor.py         |   8 +++
 v3/visualize.html         |  17 +++--
 6 files changed, 210 insertions(+), 5 deletions(-)
 create mode 100644 v3/iframe-embed-demo.html
 create mode 100644 v3/iframe-embed.html
 create mode 100644 v3/js/iframe-embed.js

diff --git a/v3/iframe-embed-demo.html b/v3/iframe-embed-demo.html
new file mode 100644
index 000000000..a4b5e43b8
--- /dev/null
+++ b/v3/iframe-embed-demo.html
@@ -0,0 +1,11 @@
+
+
+
+
+  blah blah blah
+
+
+
+
+
+
diff --git a/v3/iframe-embed.html b/v3/iframe-embed.html
new file mode 100644
index 000000000..cde799372
--- /dev/null
+++ b/v3/iframe-embed.html
@@ -0,0 +1,30 @@
+
+
+
+
+  Online Python Tutor - iframe embed page
+
+
+
+
+ 
+ 
+ 
+
+
+
+
+
+
+
+
+
+
+
+
+
+  
    
+
+
+
diff --git a/v3/js/iframe-embed.js b/v3/js/iframe-embed.js
new file mode 100644
index 000000000..1f60783c3
--- /dev/null
+++ b/v3/js/iframe-embed.js
@@ -0,0 +1,127 @@
+/*
+
+Online Python Tutor
+https://github.com/pgbovine/OnlinePythonTutor/
+
+Copyright (C) 2010-2012 Philip J. Guo (philip@pgbovine.net)
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+*/
+
+
+// Pre-reqs: pytutor.js and jquery.ba-bbq.min.js should be imported BEFORE this file
+
+
+// backend scripts to execute (Python 2 and 3 variants, if available)
+//var python2_backend_script = 'web_exec_py2.py';
+//var python3_backend_script = 'web_exec_py3.py';
+
+// uncomment below if you're running on Google App Engine using the built-in app.yaml
+var python2_backend_script = 'exec';
+var python3_backend_script = null;
+
+
+var myVisualizer = null; // singleton ExecutionVisualizer instance
+
+
+$(document).ready(function() {
+
+  var preseededCode = $.bbq.getState('code');
+  var cumulativeState = $.bbq.getState('cumulative');
+  var pyState = $.bbq.getState('py');
+
+  var preseededCurInstr = Number($.bbq.getState('curInstr'));
+  if (!preseededCurInstr) {
+    preseededCurInstr = 0;
+  }
+
+  // TODO: add more options
+  
+
+
+  var backend_script = null;
+  if (pyState == '2') {
+      backend_script = python2_backend_script;
+  }
+  else if (pyState == '3') {
+      backend_script = python3_backend_script;
+  }
+
+  if (!backend_script) {
+    alert('Error: This server is not configured to run Python ' + $('#pythonVersionSelector').val());
+    return;
+  }
+
+
+  $.get(backend_script,
+        {user_script : preseededCode, cumulative_mode: cumulativeState},
+        function(dataFromBackend) {
+          var trace = dataFromBackend.trace;
+          
+          // don't enter visualize mode if there are killer errors:
+          if (!trace ||
+              (trace.length == 0) ||
+              (trace[trace.length - 1].event == 'uncaught_exception')) {
+
+            if (trace.length == 1) {
+              alert(trace[0].exception_msg);
+            }
+            else if (trace[trace.length - 1].exception_msg) {
+              alert(trace[trace.length - 1].exception_msg);
+            }
+            else {
+              alert("Whoa, unknown error! Reload to try again, or report a bug to philip@pgbovine.net\n\n(Click the 'Generate URL' button to include a unique URL in your email bug report.)");
+            }
+          }
+          else {
+            var startingInstruction = 0;
+
+            // only do this at most ONCE, and then clear out preseededCurInstr
+            if (preseededCurInstr && preseededCurInstr < trace.length) { // NOP anyways if preseededCurInstr is 0
+              startingInstruction = preseededCurInstr;
+            }
+
+            myVisualizer = new ExecutionVisualizer('vizDiv',
+                                                   dataFromBackend,
+                                                   {startingInstruction: preseededCurInstr,
+                                                    embeddedMode: true,
+                                                    editCodeBaseURL: 'http://pythontutor.com/visualize.html',
+                                                   });
+          }
+        },
+        "json");
+
+
+  // log a generic AJAX error handler
+  $(document).ajaxError(function() {
+    alert("Online Python Tutor server error (possibly due to memory/resource overload).");
+  });
+
+
+  // redraw connector arrows on window resize
+  $(window).resize(function() {
+    if (appMode == 'display') {
+      myVisualizer.redrawConnectors();
+    }
+  });
+
+});
+
diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 64a8f9fa8..508760e1c 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -66,6 +66,8 @@ function setCodeMirrorVal(dat) {
 
 $(document).ready(function() {
 
+  $("#embedLinkDiv").hide();
+
   pyInputCodeMirror = CodeMirror(document.getElementById('codeInputPane'), {
     mode: 'python',
     lineNumbers: true,
@@ -87,11 +89,14 @@ $(document).ready(function() {
     if (appMode === undefined || appMode == 'edit') {
       $("#pyInputPane").show();
       $("#pyOutputPane").hide();
+      $("#embedLinkDiv").hide();
     }
     else if (appMode == 'display') {
       $("#pyInputPane").hide();
       $("#pyOutputPane").show();
 
+      $("#embedLinkDiv").show();
+
       $('#executeBtn').html("Visualize execution");
       $('#executeBtn').attr('disabled', false);
 
@@ -132,6 +137,7 @@ $(document).ready(function() {
     $('#executeBtn').html("Please wait ... processing your code");
     $('#executeBtn').attr('disabled', true);
     $("#pyOutputPane").hide();
+    $("#embedLinkDiv").hide();
 
 
     $.get(backend_script,
@@ -483,7 +489,7 @@ $(document).ready(function() {
   
   // log a generic AJAX error handler
   $(document).ajaxError(function() {
-    alert("Server error (possibly due to memory/resource overload).");
+    alert("Server error (possibly due to memory/resource overload). Report a bug to philip@pgbovine.net\n\n(Click the 'Generate URL' button to include a unique URL in your email bug report.)");
 
     $('#executeBtn').html("Visualize execution");
     $('#executeBtn').attr('disabled', false);
@@ -510,5 +516,19 @@ $(document).ready(function() {
     var urlStr = $.param.fragment(window.location.href, myArgs, 2 /* clobber all */);
     $('#urlOutput').val(urlStr);
   });
+
+
+  $('#genEmbedBtn').bind('click', function() {
+    assert(appMode == 'display');
+    var myArgs = {code: pyInputCodeMirror.getValue(),
+                  cumulative: $('#cumulativeModeSelector').val(),
+                  py: $('#pythonVersionSelector').val(),
+                  curInstr: myVisualizer.curInstr,
+                 };
+
+    var embedUrlStr = $.param.fragment('http://pythontutor.com/iframe-embed.html', myArgs, 2 /* clobber all */);
+    var iframeStr = '';
+    $('#embedCodeOutput').val(iframeStr);
+  });
 });
 
diff --git a/v3/pythontutor.py b/v3/pythontutor.py
index be76d4b1e..0deb959f4 100644
--- a/v3/pythontutor.py
+++ b/v3/pythontutor.py
@@ -48,6 +48,13 @@ def get(self):
     self.response.out.write(template.render())
 
 
+class IframeEmbedPage(webapp2.RequestHandler):
+  def get(self):
+    self.response.headers['Content-Type'] = 'text/html'
+    template = JINJA_ENVIRONMENT.get_template('iframe-embed.html')
+    self.response.out.write(template.render())
+
+
 class LessonPage(webapp2.RequestHandler):
 
   def get(self):
@@ -76,6 +83,7 @@ def get(self):
 
 
 app = webapp2.WSGIApplication([('/', TutorPage),
+                               ('/iframe-embed.html', IframeEmbedPage),
                                ('/lesson.html', LessonPage),
                                ('/exec', ExecScript)],
                               debug=True)
diff --git a/v3/visualize.html b/v3/visualize.html
index 6279ecb10..8ad886874 100644
--- a/v3/visualize.html
+++ b/v3/visualize.html
@@ -170,11 +170,20 @@
    
 
    
 
-
    To report a bug, click the 'Generate URL' button, paste the URL along
-with a brief error description in an email, and send the email to
-philip@pgbovine.net
+
    To share this visualization, click the 'Generate URL' button above
+and share that URL. To report a bug, paste the URL along with a brief
+error description in an email addressed to philip@pgbovine.net
    
+
+
    
+
    
+   
 
    
 
+
    To embed this visualization in your webpage, click the 'Generate
+embed code' button above and paste the resulting HTML code into your
+webpage. Adjust the height and width parameters as needed.
    
+
    
+
 Online Python Tutor supports Python 2.7 and Python 3.2 with limited module
@@ -197,7 +206,7 @@
 href="https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/user-FAQ.md">FAQ
 or other documentation
-can help. Its code is open source on GitHub.
    
 
 
    Join the 
Date: Wed, 10 Oct 2012 14:49:27 -0700
Subject: [PATCH 485/502] tweaks

---
 v3/iframe-embed-demo.html | 4 +++-
 v3/js/opt-frontend.js     | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/v3/iframe-embed-demo.html b/v3/iframe-embed-demo.html
index a4b5e43b8..dcf5949c6 100644
--- a/v3/iframe-embed-demo.html
+++ b/v3/iframe-embed-demo.html
@@ -2,10 +2,12 @@
 
 
 
-  blah blah blah
+  ifram embed demo
 
 
 
 
+
+
 
 
diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 508760e1c..f3b271ebf 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -527,7 +527,7 @@ $(document).ready(function() {
                  };
 
     var embedUrlStr = $.param.fragment('http://pythontutor.com/iframe-embed.html', myArgs, 2 /* clobber all */);
-    var iframeStr = '';
+    var iframeStr = '';
     $('#embedCodeOutput').val(iframeStr);
   });
 });

From 744c4dde119bc826cb5bd43ddbcbf15ea0fbc806 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 10 Oct 2012 14:51:20 -0700
Subject: [PATCH 486/502] clear out stale values

---
 v3/js/opt-frontend.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index f3b271ebf..2c2b98915 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -57,7 +57,7 @@ var pyInputCodeMirror; // CodeMirror object that contains the input text
 
 function setCodeMirrorVal(dat) {
   pyInputCodeMirror.setValue(dat.rtrim() /* kill trailing spaces */);
-  $('#urlOutput').val('');
+  $('#urlOutput,#embedCodeOutput').val('');
 
   // also scroll to top to make the UI more usable on smaller monitors
   $(document).scrollTop(0);
@@ -114,7 +114,7 @@ $(document).ready(function() {
       assert(false);
     }
 
-    $('#urlOutput').val(''); // clear to avoid stale values
+    $('#urlOutput,#embedCodeOutput').val(''); // clear to avoid stale values
   });
 
 
@@ -189,7 +189,7 @@ $(document).ready(function() {
               myVisualizer = new ExecutionVisualizer('pyOutputPane',
                                                      dataFromBackend,
                                                      {startingInstruction:  startingInstruction,
-                                                      updateOutputCallback: function() {$('#urlOutput').val('');}
+                                                      updateOutputCallback: function() {'#urlOutput,#embedCodeOutput').val('');}
                                                      });
 
 

From f0497d753c201537953b13d293ac58421d405b33 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 10 Oct 2012 14:52:37 -0700
Subject: [PATCH 487/502] whoops

---
 v3/js/opt-frontend.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 2c2b98915..91535bd68 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -189,7 +189,7 @@ $(document).ready(function() {
               myVisualizer = new ExecutionVisualizer('pyOutputPane',
                                                      dataFromBackend,
                                                      {startingInstruction:  startingInstruction,
-                                                      updateOutputCallback: function() {'#urlOutput,#embedCodeOutput').val('');}
+                                                      updateOutputCallback: function() {$('#urlOutput,#embedCodeOutput').val('');}
                                                      });
 
 

From 123266414d19a1733263d9517eeecae63e18fd2d Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 10 Oct 2012 14:58:40 -0700
Subject: [PATCH 488/502] updated embedding demo

---
 v3/iframe-embed-demo.html | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/v3/iframe-embed-demo.html b/v3/iframe-embed-demo.html
index dcf5949c6..2bdb818bb 100644
--- a/v3/iframe-embed-demo.html
+++ b/v3/iframe-embed-demo.html
@@ -2,12 +2,16 @@
 
 
 
-  ifram embed demo
+  Online Python Tutor - iframe embed demo
 
 
 
 
 
 
+
    
+
+
+
 
 

From d7482d9eba71289d3b3154f9d84e83ffc958e310 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 10 Oct 2012 15:06:13 -0700
Subject: [PATCH 489/502] added an extra embed option

---
 v3/js/iframe-embed.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/v3/js/iframe-embed.js b/v3/js/iframe-embed.js
index 1f60783c3..0651317e6 100644
--- a/v3/js/iframe-embed.js
+++ b/v3/js/iframe-embed.js
@@ -47,14 +47,15 @@ $(document).ready(function() {
   var preseededCode = $.bbq.getState('code');
   var cumulativeState = $.bbq.getState('cumulative');
   var pyState = $.bbq.getState('py');
+  var verticalStack = $.bbq.getState('verticalStack');
 
   var preseededCurInstr = Number($.bbq.getState('curInstr'));
   if (!preseededCurInstr) {
     preseededCurInstr = 0;
   }
 
-  // TODO: add more options
-  
+  // TODO: add more options as needed
+ 
 
 
   var backend_script = null;
@@ -103,6 +104,7 @@ $(document).ready(function() {
                                                    dataFromBackend,
                                                    {startingInstruction: preseededCurInstr,
                                                     embeddedMode: true,
+                                                    verticalStack: (verticalStack !== undefined),
                                                     editCodeBaseURL: 'http://pythontutor.com/visualize.html',
                                                    });
           }

From eeec6a95c0d05cb7c261241136f902b495b4c4a1 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 10 Oct 2012 15:21:35 -0700
Subject: [PATCH 490/502] small tweaks

---
 v3/iframe-embed-demo.html | 4 ++++
 v3/js/iframe-embed.js     | 4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/v3/iframe-embed-demo.html b/v3/iframe-embed-demo.html
index 2bdb818bb..2cda803c1 100644
--- a/v3/iframe-embed-demo.html
+++ b/v3/iframe-embed-demo.html
@@ -11,6 +11,10 @@
 
 
    
 
+
+
+
    
+
 
 
 
diff --git a/v3/js/iframe-embed.js b/v3/js/iframe-embed.js
index 0651317e6..5fc536f4f 100644
--- a/v3/js/iframe-embed.js
+++ b/v3/js/iframe-embed.js
@@ -47,7 +47,7 @@ $(document).ready(function() {
   var preseededCode = $.bbq.getState('code');
   var cumulativeState = $.bbq.getState('cumulative');
   var pyState = $.bbq.getState('py');
-  var verticalStack = $.bbq.getState('verticalStack');
+  var verticalStackBool = ($.bbq.getState('verticalStack') == 'true'); // boolean
 
   var preseededCurInstr = Number($.bbq.getState('curInstr'));
   if (!preseededCurInstr) {
@@ -104,7 +104,7 @@ $(document).ready(function() {
                                                    dataFromBackend,
                                                    {startingInstruction: preseededCurInstr,
                                                     embeddedMode: true,
-                                                    verticalStack: (verticalStack !== undefined),
+                                                    verticalStack: verticalStackBool,
                                                     editCodeBaseURL: 'http://pythontutor.com/visualize.html',
                                                    });
           }

From c0b62e52c98009f2fc5585ca26086ed035bac531 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 10 Oct 2012 16:17:03 -0700
Subject: [PATCH 491/502] Update v3/docs/embedding-HOWTO.md

---
 v3/docs/embedding-HOWTO.md | 31 ++++++++++++++++++++++++++++---
 1 file changed, 28 insertions(+), 3 deletions(-)

diff --git a/v3/docs/embedding-HOWTO.md b/v3/docs/embedding-HOWTO.md
index 0cbb8bb56..6d3c7e3ca 100644
--- a/v3/docs/embedding-HOWTO.md
+++ b/v3/docs/embedding-HOWTO.md
@@ -17,10 +17,35 @@ philip@pgbovine.net if you have questions.
 
 And please excuse the sloppy writing; I'm not trying to win any style awards here :)
 
+## iframe embedding
 
-## High-Level Overview
+An easy (although somewhat limited) way to embed an OPT visualization on your website is to enclose it within an [iframe](http://www.w3schools.com/tags/tag_iframe.asp).
 
-To embed a visualization, you:
+If you generate a visualization (e.g., click here)
+and then click on the "Generate embed code" link at the bottom of the page, the following code will be generated:
+
+```html
+
+```
+
+If you copy-and-paste the above code into your HTML webpage, then it will embed the given visualization as an iframe.
+
+See `v3/iframe-embed-demo.html` for a working demo showing several embedded iframes ([online here](http://pythontutor.com/iframe-embed-demo.html)).
+
+### iframe embedding parameters
+
+
+## Direct embedding
+
+The iframe-based approach has some limitations (e.g., hard to dynamically resize the enclosing iframe, cannot run while offline),
+so here are instructions for directly embedding visualizations into your webpage:
+
+
+### High-Level Overview
+
+To directly embed a visualization, you:
 
 1. Run the target Python program offline to generate an execution trace, which is one (really, really long)
 string representing a JavaScript (JSON) object.
@@ -38,7 +63,7 @@ or, say, a USB drive), they can play with the visualization without an Internet
 Finally, multiple visualizations can be embedded in a single HTML webpage, although you need to be careful
 to redraw the SVG arrows when page elements are resized or moved.
 
-## The Nitty-Gritty
+### The Nitty-Gritty
 
 Let's attempt to go [literate programming](http://en.wikipedia.org/wiki/Literate_programming) style now ... load up
 [embedding-demo.html](http://pythontutor.com/embedding-demo.html) in

From 54cd439bef9098913910970fa899798fbc051003 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 10 Oct 2012 16:28:18 -0700
Subject: [PATCH 492/502] Update v3/docs/embedding-HOWTO.md

---
 v3/docs/embedding-HOWTO.md | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/v3/docs/embedding-HOWTO.md b/v3/docs/embedding-HOWTO.md
index 6d3c7e3ca..4ce31c16f 100644
--- a/v3/docs/embedding-HOWTO.md
+++ b/v3/docs/embedding-HOWTO.md
@@ -22,7 +22,7 @@ And please excuse the sloppy writing; I'm not trying to win any style awards her
 An easy (although somewhat limited) way to embed an OPT visualization on your website is to enclose it within an [iframe](http://www.w3schools.com/tags/tag_iframe.asp).
 
 If you generate a visualization (e.g., click here)
-and then click on the "Generate embed code" link at the bottom of the page, the following code will be generated:
+and then click the "Generate embed code" button at the bottom of the page, the following code will be generated:
 
 ```html
 
+
 
 
    
 
diff --git a/v3/js/iframe-embed.js b/v3/js/iframe-embed.js
index 5fc536f4f..8ead50aad 100644
--- a/v3/js/iframe-embed.js
+++ b/v3/js/iframe-embed.js
@@ -46,6 +46,10 @@ $(document).ready(function() {
 
   var preseededCode = $.bbq.getState('code');
   var cumulativeState = $.bbq.getState('cumulative');
+  if (!cumulativeState) {
+    cumulativeState = 'false'; // string!
+  }
+
   var pyState = $.bbq.getState('py');
   var verticalStackBool = ($.bbq.getState('verticalStack') == 'true'); // boolean
 

From 3904492d157acb2e3b2822ce82cbe5a82688f87b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 10 Oct 2012 16:40:02 -0700
Subject: [PATCH 494/502] Update v3/docs/embedding-HOWTO.md

---
 v3/docs/embedding-HOWTO.md | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/v3/docs/embedding-HOWTO.md b/v3/docs/embedding-HOWTO.md
index 4ce31c16f..d03e6afa7 100644
--- a/v3/docs/embedding-HOWTO.md
+++ b/v3/docs/embedding-HOWTO.md
@@ -41,17 +41,19 @@ You can customize the iframe's size by adjusting the `width` and `height` parame
 after the hash mark (`#` character) in the `src=` URL string. Note that OPT uses the hash mark rather than the usual
 question mark `?` query string. Here are the currently-supported parameters:
 
-- `code` - The Python code to visualize (URL encoded string)
-- `cumulative` - Should exited functions still be displayed? (mandatory string: `true` or `false`)
+- `code` - The Python code to visualize (mandatory: URL-encoded string)
 - `py` - Python interpreter version (mandatory: `2` for Python 2.7 or `3` for Python 3.2)
 - `verticalStack` - Set to `true` if you want the code and visualization to stack atop one another (optional)
-- `curInstr` - A (zero-indexed) integer of the instruction to jump to in the visualization (optional)
+- `curInstr` - A (zero-indexed) integer of the execution point to directly jump to in the visualization (optional)
+- `cumulative` - Set to `true` if you want exited functions to be displayed (optional)
+
 
 
 ## Direct embedding
 
-The iframe-based approach has some limitations (e.g., hard to dynamically resize the enclosing iframe, cannot run while offline),
-so here are instructions for directly embedding visualizations into your webpage:
+The iframe-based approach has some limitations (e.g., hard to dynamically resize the enclosing iframe,
+cannot run while offline, limited parameter choices).
+Here are instructions for a more powerful but harder-to-use alternative -- directly embedding visualizations.
 
 
 ### High-Level Overview

From ac2ee6f9ef535a21ebd8db49f81a6619e31a88fa Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Wed, 10 Oct 2012 16:46:50 -0700
Subject: [PATCH 495/502] bah

---
 v3/js/iframe-embed.js | 1 -
 1 file changed, 1 deletion(-)

diff --git a/v3/js/iframe-embed.js b/v3/js/iframe-embed.js
index 8ead50aad..0e0028643 100644
--- a/v3/js/iframe-embed.js
+++ b/v3/js/iframe-embed.js
@@ -109,7 +109,6 @@ $(document).ready(function() {
                                                    {startingInstruction: preseededCurInstr,
                                                     embeddedMode: true,
                                                     verticalStack: verticalStackBool,
-                                                    editCodeBaseURL: 'http://pythontutor.com/visualize.html',
                                                    });
           }
         },

From c9be9e4acf45981eb830d9c192ddb736478aed63 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 11 Oct 2012 10:18:15 -0700
Subject: [PATCH 496/502] hide 'Edit code' link if editCodeBaseURL is null

---
 v3/css/pytutor.css    | 2 +-
 v3/js/opt-frontend.js | 3 ++-
 v3/js/pytutor.js      | 3 ++-
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/v3/css/pytutor.css b/v3/css/pytutor.css
index b1dfd935a..0fe03b844 100644
--- a/v3/css/pytutor.css
+++ b/v3/css/pytutor.css
@@ -470,7 +470,7 @@ div.ExecutionVisualizer div#heapHeader {
 
 div.ExecutionVisualizer #executionSlider {
   width: 500px;
-  margin-top: 15px;
+  margin-top: 20px;
   margin-bottom: 5px;
 
   margin-left: auto;
diff --git a/v3/js/opt-frontend.js b/v3/js/opt-frontend.js
index 91535bd68..8aec34b2e 100644
--- a/v3/js/opt-frontend.js
+++ b/v3/js/opt-frontend.js
@@ -105,7 +105,8 @@ $(document).ready(function() {
       // jsPlumb connectors won't render properly
       myVisualizer.updateOutput();
 
-      // customize edit button click functionality AFTER rendering (TODO: awkward!)
+      // customize edit button click functionality AFTER rendering (NB: awkward!)
+      $('#pyOutputPane #editCodeLinkDiv').show();
       $('#pyOutputPane #editBtn').click(function() {
         enterEditMode();
       });
diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 717752235..90bd126a8 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -71,7 +71,7 @@ var curVisualizerID = 1; // global to uniquely identify each ExecutionVisualizer
 //   hideOutput - hide "Program output" display
 //   codeDivHeight - maximum height of #pyCodeOutputDiv (in integer pixels)
 //   codeDivWidth  - maximum width  of #pyCodeOutputDiv (in integer pixels)
-//   editCodeBaseURL - the base URL to visit when the user clicks 'Edit code'
+//   editCodeBaseURL - the base URL to visit when the user clicks 'Edit code' (if null, then 'Edit code' link hidden)
 //   embeddedMode - make the widget narrower horizontally and disable breakpoints
 //   updateOutputCallback - function to call (with 'this' as parameter)
 //                          whenever this.updateOutput() is called
@@ -252,6 +252,7 @@ ExecutionVisualizer.prototype.render = function() {
     this.domRoot.find('#editBtn').attr('href', urlStr);
   }
   else {
+    this.domRoot.find('#editCodeLinkDiv').hide(); // just hide for simplicity!
     this.domRoot.find('#editBtn').attr('href', "#");
     this.domRoot.find('#editBtn').click(function(){return false;}); // DISABLE the link!
   }

From 7f96c8d60403ef5ce85dbf29197ad94fc3bc163b Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 11 Oct 2012 10:30:14 -0700
Subject: [PATCH 497/502] get embeddedMode to play nicely with codeDivWidth and
 codeDivHeight

---
 v3/js/pytutor.js | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index 90bd126a8..a46f279ac 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -72,7 +72,7 @@ var curVisualizerID = 1; // global to uniquely identify each ExecutionVisualizer
 //   codeDivHeight - maximum height of #pyCodeOutputDiv (in integer pixels)
 //   codeDivWidth  - maximum width  of #pyCodeOutputDiv (in integer pixels)
 //   editCodeBaseURL - the base URL to visit when the user clicks 'Edit code' (if null, then 'Edit code' link hidden)
-//   embeddedMode - make the widget narrower horizontally and disable breakpoints
+//   embeddedMode    - shortcut for hideOutput=true, codeDivWidth=350, codeDivHeight=400
 //   updateOutputCallback - function to call (with 'this' as parameter)
 //                          whenever this.updateOutput() is called
 //                          (BEFORE rendering the output display)
@@ -261,8 +261,14 @@ ExecutionVisualizer.prototype.render = function() {
   if (this.params.embeddedMode) {
     this.params.hideOutput = true; // put this before hideOutput handler
 
-    this.params.codeDivWidth = 350;
-    this.params.codeDivHeight = 400;
+    // don't override if they've already been set!
+    if (this.params.codeDivWidth === undefined) {
+      this.params.codeDivWidth = 350;
+    }
+
+    if (this.params.codeDivHeight === undefined) {
+      this.params.codeDivHeight = 400;
+    }
   }
 
   

From 7ed4150415e94dec84c4e091f876e971e4292a6e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 11 Oct 2012 11:16:23 -0700
Subject: [PATCH 498/502] added an redrawAllConnectorsOnHeightChange option

---
 v3/embedding-demo.js | 14 ++++----------
 v3/js/pytutor.js     | 17 +++++++++++++++--
 2 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/v3/embedding-demo.js b/v3/embedding-demo.js
index 4224b17e0..962e91c54 100644
--- a/v3/embedding-demo.js
+++ b/v3/embedding-demo.js
@@ -39,8 +39,8 @@ $(document).ready(function() {
   // WILL NOT MOVE. Thus, they will be in the incorrect location
   // unless you call redrawAllConnectors().
   //
-  // We use the "heightChangeCallback" optional parameter to force redraw of all SVG arrows
-  // of visualizers BELOW the current one, whenever its height changes.
+  // We use the "redrawAllConnectorsOnHeightChange" optional parameter to force redraw
+  // of all SVG arrows of ALL visualizers, whenever the height of one changes.
   //
   // Alternatively, here is one jQuery plugin that you can use to detect div height changes:
   // http://benalman.com/projects/jquery-resize-plugin/
@@ -51,11 +51,7 @@ $(document).ready(function() {
   // Render listSumTrace inside of listSumDiv
   var listSumVisualizer = new ExecutionVisualizer('listSumDiv', listSumTrace,
                                                   {embeddedMode: true,
-                                                   heightChangeCallback: function() {
-                                                     // note that these might not exist during a callback ...
-                                                     if (hanoiVisualizer) {hanoiVisualizer.redrawConnectors();}
-                                                     if (happyVisualizer) {happyVisualizer.redrawConnectors();}
-                                                   },
+                                                   redrawAllConnectorsOnHeightChange: true,
                                                    editCodeBaseURL: 'http://pythontutor.com/visualize.html'});
 
   // The "startingInstruction: 15" optional parameter means to jump to step 15
@@ -68,9 +64,7 @@ $(document).ready(function() {
                                                   {embeddedMode: true,
                                                    startingInstruction: 15,
                                                    verticalStack: true,
-                                                   heightChangeCallback: function() {
-                                                     if (happyVisualizer) {happyVisualizer.redrawConnectors();}
-                                                   },
+                                                   redrawAllConnectorsOnHeightChange: true,
                                                    editCodeBaseURL: 'http://pythontutor.com/visualize.html'});
 
   // "embeddedMode: false" displays the full visualizer widget with the "Program Output" pane
diff --git a/v3/js/pytutor.js b/v3/js/pytutor.js
index a46f279ac..eeff85a6e 100644
--- a/v3/js/pytutor.js
+++ b/v3/js/pytutor.js
@@ -55,6 +55,8 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 */
 
+var allVisualizers = []; // global array of ALL visualizers ever on the page
+
 
 var SVG_ARROW_POLYGON = '0,3 12,3 12,0 18,5 12,10 12,7 0,7';
 var SVG_ARROW_HEIGHT = 10; // must match height of SVG_ARROW_POLYGON
@@ -78,6 +80,9 @@ var curVisualizerID = 1; // global to uniquely identify each ExecutionVisualizer
 //                          (BEFORE rendering the output display)
 //   heightChangeCallback - function to call (with 'this' as parameter)
 //                          whenever the HEIGHT of #dataViz changes
+//   redrawAllConnectorsOnHeightChange - if this is non-null, then call redrawConnectors() in ALL ExecutionVisualizer
+//                                       objects on this page whenever the height of ANY of them changes.
+//                                       (NB: This might be inefficient and overkill; use at your own discretion.)
 //   verticalStack - if true, then stack code display ON TOP of visualization
 //                   (else place side-by-side)
 function ExecutionVisualizer(domRootID, dat, params) {
@@ -158,6 +163,8 @@ function ExecutionVisualizer(domRootID, dat, params) {
   this.hasRendered = false;
 
   this.render(); // go for it!
+
+  allVisualizers.push(this);
 }
 
 
@@ -1062,10 +1069,16 @@ ExecutionVisualizer.prototype.updateOutput = function(smoothTransition) {
 
 
   // call the callback if necessary (BEFORE rendering)
-  if (this.params.heightChangeCallback) {
-    if (myViz.domRoot.find('#dataViz').height() != prevDataVizHeight) {
+  if (myViz.domRoot.find('#dataViz').height() != prevDataVizHeight) {
+    if (this.params.heightChangeCallback) {
       this.params.heightChangeCallback(this);
     }
+
+    if (this.params.redrawAllConnectorsOnHeightChange) {
+      $.each(allVisualizers, function(i, e) {
+        e.redrawConnectors();
+      });
+    }
   }
 
 }

From 39ae4f7455e8b7458b02d26360b20000838e0398 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 11 Oct 2012 11:36:15 -0700
Subject: [PATCH 499/502] Update v3/docs/project-ideas.md

---
 v3/docs/project-ideas.md | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/v3/docs/project-ideas.md b/v3/docs/project-ideas.md
index 50b432db5..0ad7eb552 100644
--- a/v3/docs/project-ideas.md
+++ b/v3/docs/project-ideas.md
@@ -103,7 +103,10 @@ https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/opt-trace-form
 
 ... and the frontend should be able to visualize it!
 
-My
+For instance, the [Chicory Java trace generator for Daikon](http://groups.csail.mit.edu/pag/daikon/download/doc/daikon_manual_html/daikon_7.html#SEC69)
+might be a good basis for writing a Java backend for OPT.
+
+Also, my
 [master's thesis](http://pgbovine.net/projects/pubs/guo-mixedlevel-mengthesis.pdf) from 2006
 describes one possible technique for building a C-language backend based upon the [Valgrind](http://www.valgrind.org)
 tool. More importantly, it describes the difficulties involved in creating a robust execution

From 3c0ddfab8bf8bef2a6816f624512a5f573022d9a Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Thu, 11 Oct 2012 16:47:39 -0700
Subject: [PATCH 500/502] added Hangout on Air link

---
 v3/css/index.css | 2 +-
 v3/index.html    | 7 +++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/v3/css/index.css b/v3/css/index.css
index f23f6eaf5..053cbca81 100644
--- a/v3/css/index.css
+++ b/v3/css/index.css
@@ -117,7 +117,7 @@ div#learnPane p {
 div#learnPane #startLink {
   font-size: 16pt;
   font-weight: normal;
-  margin-top: 20px;
+  margin-top: 25px;
   margin-bottom: 20px;
   font-family: verdana, arial, helvetica, sans-serif;
 }
diff --git a/v3/index.html b/v3/index.html
index 632afe8e5..ea93033f1 100644
--- a/v3/index.html
+++ b/v3/index.html
@@ -101,14 +101,17 @@ 
    LEARN programming by vi
 College have used it for teaching introductory computer science and
 programming courses.
    
 
+
     Watch a
+video demo and interview with the instructor of UC Berkeley's
+introductory CS course.
    
+
 
    
 But this is just the beginning. We are actively seeking partnerships with
 educators at all grade levels to deploy and improve this tool.  Email
 philip@pgbovine.net if you are interested in collaborating.
 
    
 
-
    
-
 

From 95821963ff5998499259ca5038d7ff82eecc530e Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 15 Oct 2012 13:45:24 -0300
Subject: [PATCH 501/502] Update v3/docs/project-ideas.md

---
 v3/docs/project-ideas.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/v3/docs/project-ideas.md b/v3/docs/project-ideas.md
index 0ad7eb552..08dd3e97c 100644
--- a/v3/docs/project-ideas.md
+++ b/v3/docs/project-ideas.md
@@ -122,6 +122,12 @@ Right now the OPT backend runs Python code on the server, but it would be super-
 that runs entirely in the browser. Modifying Skulpt -- http://www.skulpt.org/ -- is the leading contender here,
 since I am in touch with its main developers.
 
+The basic idea is to use Skulpt to generate a JavaScript trace object (all within the web browser without
+a server call) and then construct a new ExecutionVisualizer with that trace object as a parameter.
+Read "Direct embedding" and the associated code for more detailed info:
+https://github.com/pgbovine/OnlinePythonTutor/blob/master/v3/docs/embedding-HOWTO.md#direct-embedding
+
+
 Main Advantages:
   - Enables fine-grained tracing of expression and sub-expression evaluation, which has clear pedagogical benefits; right now OPT can only single-step over one line at a time since it relies on the Python bdb debugger.
   - Enables an interactive REPL that incrementally takes in user inputs rather than just executing batch programs; this can lead to better interactivity and responsiveness.

From 2eaa305afb14eb17b4836c7e5892975079e044d7 Mon Sep 17 00:00:00 2001
From: Philip Guo 
Date: Mon, 15 Oct 2012 16:59:08 -0300
Subject: [PATCH 502/502] Update v3/docs/developer-overview.md

---
 v3/docs/developer-overview.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/v3/docs/developer-overview.md b/v3/docs/developer-overview.md
index 734e8e42c..588b961c0 100644
--- a/v3/docs/developer-overview.md
+++ b/v3/docs/developer-overview.md
@@ -43,6 +43,9 @@ if you're eventually going to deploy on something other than Google App Engine,
 for development and testing. The main caveat here is that Google App Engine currently runs Python 2.7,
 so you won't be able to test Python 3 locally this way.
 
+Here is a [blog post by a Hacker School student](http://theworldsoldestintern.wordpress.com/2012/10/15/installing-online-python-tutor-on-your-laptop-localhost8080/)
+who set up OPT on his Ubuntu laptop. (btw [Hacker School](http://www.hackerschool.com/) is worth checking out!)
+
 
 ## Overall system architecture