From 380e30bb6c552601fefd3f67d9b53634ecd2e3bf Mon Sep 17 00:00:00 2001 From: huayongpan Date: Mon, 15 Oct 2018 12:30:38 +0800 Subject: [PATCH 01/26] Add chapter_01 examples --- 01-data-model/example_1_1.py | 46 +++++++++++++++++++++++++++ 01-data-model/example_1_2.py | 61 ++++++++++++++++++++++++++++++++++++ 2 files changed, 107 insertions(+) create mode 100644 01-data-model/example_1_1.py create mode 100644 01-data-model/example_1_2.py diff --git a/01-data-model/example_1_1.py b/01-data-model/example_1_1.py new file mode 100644 index 0000000..754d70b --- /dev/null +++ b/01-data-model/example_1_1.py @@ -0,0 +1,46 @@ +import collections + +# collections模块的namedtuple子类不仅可以使用item的index访问item，还可以通过item的name进行访问。 +Card = collections.namedtuple('Card', ['rank', 'suit']) + +class FrenchDeck: + ranks = [str(n) for n in range(2, 11)] + list('JQKA') + suits = 'spades diamonds clubs hearts'.split() + + def __init__(self): + self._cards = [Card(rank, suit) for suit in self.suits + for rank in self.ranks] + + def __len__(self): + return len(self._cards) + + def __getitem__(self, item): + return self._cards[item] + + + +if __name__ == '__main__': + deck = FrenchDeck() + print(len(deck)) + + from random import choice + print(choice(deck)) + + # print the top 3 cards + print(deck[:3]) + # only print 'A' cards + print(deck[12::13]) + + # print all cards + for card in deck: + print(card) + + suit_values = dict(spades=3, hearts=2, diamonds=1, clubs=0) + + def spades_high(card): + rank_value = FrenchDeck.ranks.index(card.rank) + return rank_value * len(suit_values) + suit_values[card.suit] + + + for card in sorted(deck, key=spades_high): + print(card) \ No newline at end of file diff --git a/01-data-model/example_1_2.py b/01-data-model/example_1_2.py new file mode 100644 index 0000000..5f05324 --- /dev/null +++ b/01-data-model/example_1_2.py @@ -0,0 +1,61 @@ +from math import hypot + +class Vector: + def __init__(self, x = 0.0, y = 0.0): + self.x = x + self.y = y + + def __repr__(self): + return 'Vector(%r, %r)' % (self.x, self.y) + + + def __abs__(self): + return hypot(self.x, self.y) + + def __bool__(self): + # return bool(abs(self)) + return bool(self.x or self.y) + + def __add__(self, other): + x = self.x + other.x + y = self.y + other.y + return Vector(x, y) + + # only support: right multiple(vector * scalar) + def __mul__(self, scalar): + return Vector(self.x * scalar, self.y * scalar) + + def __rmul__(self, scalar): + return Vector(self.x * scalar, self.y * scalar) + + +def zero_vector(v0): + if v0: + print('Not Zero vector') + else: + print('Zero vector') + +if __name__ == '__main__': + v1 = Vector(1, 2) + v2 = Vector(3, 4) + print(v1) + v3 = v1 + v2 + print(v3) + v4 = v1 * 8 + print(v4) + + v5 = 5 * v2 + print(v5) + + v0 = Vector(0, 0) + print("v0") + zero_vector(v0) + print("v1") + zero_vector(v1) + + + + + + + From a9bf41cecaf6201871857aff6c180d5e84ef1ecc Mon Sep 17 00:00:00 2001 From: huayongpan Date: Mon, 15 Oct 2018 12:31:01 +0800 Subject: [PATCH 02/26] Add chapter_02 examples --- 02-array-seq/example_2_11.py | 14 ++++++++++++++ 02-array-seq/example_2_17.py | 26 ++++++++++++++++++++++++++ 02-array-seq/example_2_18.py | 9 +++++++++ 02-array-seq/example_2_19.py | 13 +++++++++++++ 02-array-seq/example_2_20.py | 22 ++++++++++++++++++++++ 02-array-seq/example_2_21.py | 13 +++++++++++++ 02-array-seq/example_2_23.py | 14 ++++++++++++++ 7 files changed, 111 insertions(+) create mode 100644 02-array-seq/example_2_11.py create mode 100644 02-array-seq/example_2_17.py create mode 100644 02-array-seq/example_2_18.py create mode 100644 02-array-seq/example_2_19.py create mode 100644 02-array-seq/example_2_20.py create mode 100644 02-array-seq/example_2_21.py create mode 100644 02-array-seq/example_2_23.py diff --git a/02-array-seq/example_2_11.py b/02-array-seq/example_2_11.py new file mode 100644 index 0000000..8687930 --- /dev/null +++ b/02-array-seq/example_2_11.py @@ -0,0 +1,14 @@ +invoice = """ +0 6 40 52 55 +1909 Pimoroni PiBrella $17.50 3 $52.50 +1489 6mm Tactile Switch x20 $4.95 2 $9.90 +""" + +SKU = slice(0, 6) +DESCRIPTION = slice(6, 40) +UNIT_PRICE = slice(40, 52) +QUANTITY = slice(52, 55) +ITEM_TOTAL = slice(55, None) +line_items = invoice.split('\n')[2:] +for item in line_items: + print(item[UNIT_PRICE], item[DESCRIPTION]) \ No newline at end of file diff --git a/02-array-seq/example_2_17.py b/02-array-seq/example_2_17.py new file mode 100644 index 0000000..144599c --- /dev/null +++ b/02-array-seq/example_2_17.py @@ -0,0 +1,26 @@ +import bisect +import sys + +HAYSTACK = [1, 4, 5, 6, 8, 12, 15, 20, 21, 23, 23, 26, 29, 30] +NEEDLES = [0, 1, 2, 5, 8, 10, 22, 23, 29, 30, 31] + +ROW_FMT = '{0:2d} @ {1:2d} {2}{0:<2d}' + +def demo(bisect_fn): + for needle in reversed(NEEDLES): + position = bisect_fn(HAYSTACK, needle) + offset = position * ' |' + print(ROW_FMT.format(needle, position, offset)) + +if __name__ == '__main__': + # bisect 函数其实是bisect_right函数的别名 + # bisect_left返回的插入位置是原序列中跟被插入元素相等元素的位置的前面 + # bisect_right返回的插入位置是原序列中跟被插入元素相等元素的位置的后面 + if sys.argv[-1] == 'left': + bisect_fn = bisect.bisect_left + else: + bisect_fn = bisect.bisect + + print('DEMO:', bisect_fn.__name__) + print('haystack ->', ' '.join('%2d' % n for n in HAYSTACK)) + demo(bisect_fn) \ No newline at end of file diff --git a/02-array-seq/example_2_18.py b/02-array-seq/example_2_18.py new file mode 100644 index 0000000..855ac18 --- /dev/null +++ b/02-array-seq/example_2_18.py @@ -0,0 +1,9 @@ +import bisect + +def grade(score, breakpoints=[60, 70, 80, 90], grades='FDCBA'): + i = bisect.bisect(breakpoints, score) + return grades[i] + + +if __name__ == '__main__': + print([grade(score) for score in [33, 99, 77, 70, 89, 90, 100]]) \ No newline at end of file diff --git a/02-array-seq/example_2_19.py b/02-array-seq/example_2_19.py new file mode 100644 index 0000000..1e271ab --- /dev/null +++ b/02-array-seq/example_2_19.py @@ -0,0 +1,13 @@ +import bisect +import random + +SIZE = 7 + +random.seed(1729) + +my_list = [] + +for i in range(SIZE): + new_item = random.randrange(SIZE*2) + bisect.insort(my_list, new_item) + print('%2d ->' % new_item, my_list) \ No newline at end of file diff --git a/02-array-seq/example_2_20.py b/02-array-seq/example_2_20.py new file mode 100644 index 0000000..da0361d --- /dev/null +++ b/02-array-seq/example_2_20.py @@ -0,0 +1,22 @@ +from array import array +from random import random + +floats1 = array('d', (random() for i in range(10**7))) +print(floats1[-1]) + +fp = open('floats.bin', 'wb') +floats1.tofile(fp) +fp.close() + +fp = open('floats.txt', 'w') +for item in floats1: + fp.write(str(item) + '\n') +fp.close() + +floats2 = array('d') +fp = open('floats.bin', 'rb') +floats2.fromfile(fp, 10**7) +fp.close() +print(floats2[-1]) + +print('floats1 == floats2', floats1 == floats2) diff --git a/02-array-seq/example_2_21.py b/02-array-seq/example_2_21.py new file mode 100644 index 0000000..45612dd --- /dev/null +++ b/02-array-seq/example_2_21.py @@ -0,0 +1,13 @@ +from array import array + +numbers = array('h', [-2, -1, 0, 1, 2]) +memv = memoryview(numbers) +print('length of memoryview:', len(memv)) +print('the first element:', memv[0]) +#转换成单字节，查看numbers +memv_oct = memv.cast('B') +print(memv_oct.tolist()) +memv_oct[5] = 4 +#占2个字节的整数的高位字节改成了4 +print(numbers) + diff --git a/02-array-seq/example_2_23.py b/02-array-seq/example_2_23.py new file mode 100644 index 0000000..9e8f0a3 --- /dev/null +++ b/02-array-seq/example_2_23.py @@ -0,0 +1,14 @@ +from collections import deque + +dq = deque(range(10), maxlen=10) +print(dq) +dq.rotate(3) +print(dq) +dq.rotate(-4) +print(dq) +dq.appendleft(-1) +print(dq) +dq.extend([11, 22, 33]) +print(dq) +dq.extendleft([40, 30, 20, 10]) +print(dq) \ No newline at end of file From e16fd3b13783acc86dff420de0f1f23af82dedfb Mon Sep 17 00:00:00 2001 From: huayongpan Date: Mon, 15 Oct 2018 12:31:29 +0800 Subject: [PATCH 03/26] Add chapter_03 examples --- 03-dict-set/example_3_5.py | 18 ++++++++++++++++++ 03-dict-set/example_3_7.py | 24 ++++++++++++++++++++++++ 03-dict-set/example_3_9.py | 22 ++++++++++++++++++++++ 3 files changed, 64 insertions(+) create mode 100644 03-dict-set/example_3_5.py create mode 100644 03-dict-set/example_3_7.py create mode 100644 03-dict-set/example_3_9.py diff --git a/03-dict-set/example_3_5.py b/03-dict-set/example_3_5.py new file mode 100644 index 0000000..ba9b19b --- /dev/null +++ b/03-dict-set/example_3_5.py @@ -0,0 +1,18 @@ +import sys +import re +import collections + +WORD_RE = re.compile(r'\w+') +index = collections.defaultdict(list) + +with open('./paragraph.txt', encoding='utf-8') as fp: + for line_no, line in enumerate(fp, 1): + for match in WORD_RE.finditer(line): + word = match.group() + column_no = match.start() + 1 + location = (line_no, column_no) + index[word].append(location) + + +for word in sorted(index, key=str.upper): + print(word, index[word]) \ No newline at end of file diff --git a/03-dict-set/example_3_7.py b/03-dict-set/example_3_7.py new file mode 100644 index 0000000..779c6dd --- /dev/null +++ b/03-dict-set/example_3_7.py @@ -0,0 +1,24 @@ +# +class StrKeyDict0(dict): + def __missing__(self, key): + if isinstance(key, str): + raise KeyError(key) + return self[str(key)] + + def get(self, key, default=None): + try: + return self[key] + except: + return default + + def __contains__(self, key): + return key in self.keys() or str(key) in self.keys() + +if __name__ == '__main__': + d = StrKeyDict0([('2', 'two'), ('4', 'four')]) + print(d['2']) + print(d[4]) + # print(d[1]) + print(d.get('2')) + print(d.get(4)) + print(d.get(1, 'N/A')) \ No newline at end of file diff --git a/03-dict-set/example_3_9.py b/03-dict-set/example_3_9.py new file mode 100644 index 0000000..e1adcee --- /dev/null +++ b/03-dict-set/example_3_9.py @@ -0,0 +1,22 @@ +from types import MappingProxyType + +d = { 1:'A'} +d_proxy = MappingProxyType(d) +print(d_proxy) +print(d_proxy[1]) +d_proxy[2] = 'x' + +d_proxy +Out[3]: mappingproxy({1: 'A'}) +d_proxy[2] = 'x' +# Traceback +# File "", line 1, in +# d_proxy[2] = 'x' +# TypeError: 'mappingproxy' object does not support item assignment +d_proxy +Out[5]: mappingproxy({1: 'A'}) +d[2] = 'B' +d_proxy +Out[7]: mappingproxy({1: 'A', 2: 'B'}) +d_proxy[2] +Out[8]: 'B' \ No newline at end of file From 9b35de31f63e454bc42794e09c1393f2aacdf2bb Mon Sep 17 00:00:00 2001 From: huayongpan Date: Mon, 15 Oct 2018 12:32:24 +0800 Subject: [PATCH 04/26] Add support materials --- 03-dict-set/paragraph.txt | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 03-dict-set/paragraph.txt diff --git a/03-dict-set/paragraph.txt b/03-dict-set/paragraph.txt new file mode 100644 index 0000000..018b329 --- /dev/null +++ b/03-dict-set/paragraph.txt @@ -0,0 +1,21 @@ +Brazilians will vote Sunday in presidential elections. +A total of 13 candidates are on the ballot. +The leading candidate is said to be 63-year-old Jair Bolsonaro of the Social Liberal Party. +He is supported by 35 percent of likely voters in the latest opinion survey. +During the election campaign, Bolsonaro has said that, if elected, he will help Brazil deal with a number of problems. +He has promised to take steps to reduce crime, strengthen the economy and fight corruption. +But many Brazilians are concerned about some of the statements Bolsonaro has made in the past. +Some believe many of his ideas are racist, homophobic and unfair to women. +Bolsonaro's supporters say tens of millions of Brazilians hope he will be elected, even if they will not say so to friends or family members. +In opinion surveys, his nearest opponent is Workers' Party candidate Fernando Haddad, who replaced former president Luiz Inacio Lula da Silva. +Lula is serving a 12-year prison sentence for corruption. Brazil's top electoral court barred him from serving as a candidate in August. +Last month, Lula told supporters, "I want everyone who would vote for me to vote for Fernando Haddad for president of Brazil. +From now on, he will be Lula for millions of Brazilians." +Haddad and Lula are said to be friends and similar in their political positions. +But for many voters in Brazil, the two men are also very different. +Lula served as the country's president between 2003 and 2011. +Haddad was mayor of Sao Paolo for four years, from 2013 to 2017. +Before becoming a candidate for mayor in 2012, Haddad served as Brazil's education minister under Lula and then former president Dilma Rousseff. +American Mark Jones has been watching the election campaign. +Jones is head of the Latin American Studies program at Rice University in Houston, Texas. +He says a Bolsonaro victory would represent a move away from traditional party candidates in Brazil. \ No newline at end of file From f30c03a5f5032a73c2ec173b92025b0f3938ce1e Mon Sep 17 00:00:00 2001 From: huayongpan Date: Thu, 25 Oct 2018 09:44:05 +0800 Subject: [PATCH 05/26] Add example_4_10 --- 04-text-byte/example_4_10.py | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 04-text-byte/example_4_10.py diff --git a/04-text-byte/example_4_10.py b/04-text-byte/example_4_10.py new file mode 100644 index 0000000..26fbfa8 --- /dev/null +++ b/04-text-byte/example_4_10.py @@ -0,0 +1,19 @@ +fp = open('cafe.txt', 'w', encoding='utf-8') +print(fp) +print(fp.write('café')) +fp.close() +import os +print(os.stat('cafe.txt').st_size) +fp2 = open('cafe.txt') +print(fp2) +print(fp2.encoding) +print(fp2.read()) +fp.close() +fp3 = open('cafe.txt', encoding='utf-8') +print(fp3) +print(fp3.read()) +fp3.close() +fp4 = open('cafe.txt', 'rb') +print(fp4) +print(fp4.read()) +fp4.close() From 6cc624d1415c0bfe25828c4233de05bab23caf5e Mon Sep 17 00:00:00 2001 From: huayongpan Date: Thu, 25 Oct 2018 10:05:08 +0800 Subject: [PATCH 06/26] Change the number of items --- 02-array-seq/example_2_20.py | 4 ++-- 04-text-byte/cafe.txt | 1 + 2 files changed, 3 insertions(+), 2 deletions(-) create mode 100644 04-text-byte/cafe.txt diff --git a/02-array-seq/example_2_20.py b/02-array-seq/example_2_20.py index da0361d..a7cec30 100644 --- a/02-array-seq/example_2_20.py +++ b/02-array-seq/example_2_20.py @@ -1,7 +1,7 @@ from array import array from random import random -floats1 = array('d', (random() for i in range(10**7))) +floats1 = array('d', (random() for i in range(10**3))) print(floats1[-1]) fp = open('floats.bin', 'wb') @@ -15,7 +15,7 @@ floats2 = array('d') fp = open('floats.bin', 'rb') -floats2.fromfile(fp, 10**7) +floats2.fromfile(fp, 10**3) fp.close() print(floats2[-1]) diff --git a/04-text-byte/cafe.txt b/04-text-byte/cafe.txt new file mode 100644 index 0000000..1c2e52c --- /dev/null +++ b/04-text-byte/cafe.txt @@ -0,0 +1 @@ +café \ No newline at end of file From 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+0.37074461928654023 +0.8270398036333397 +0.5092516438785792 +0.44852712661666294 +0.786958847635865 +0.22156754285384428 +0.34218737959138956 +0.05912098513219732 +0.7796407931303314 +0.42422803263464226 +0.7435098904848829 +0.5641917320420474 +0.7754392437080894 +0.4218167972949217 +0.8788320755140397 +0.5349003957683597 +0.20935444679962656 +0.8421959939884889 +0.6923905131902395 +0.9008483831232639 +0.7670283071159404 +0.8773814819011445 +0.456172590073069 +0.917207419997926 From 9edd94ed6183454c397c8c8d278bc9eb1fba83c3 Mon Sep 17 00:00:00 2001 From: huayongpan Date: Fri, 26 Oct 2018 11:55:21 +0800 Subject: [PATCH 10/26] Add example 4 10 --- 04-text-byte/example_4_10.py | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/04-text-byte/example_4_10.py b/04-text-byte/example_4_10.py index 26fbfa8..d36fcf0 100644 --- a/04-text-byte/example_4_10.py +++ b/04-text-byte/example_4_10.py @@ -1,11 +1,15 @@ fp = open('cafe.txt', 'w', encoding='utf-8') print(fp) +# <_io.TextIOWrapper name='cafe.txt' mode='w' encoding='utf-8'> +# 默认情况下，open函数采用文本模式，返回一个TextIOWrapper对象 print(fp.write('café')) +# 在TextIOWrapper对象上调用write方法返回写入的Unicode字符数：4 fp.close() import os print(os.stat('cafe.txt').st_size) fp2 = open('cafe.txt') print(fp2) +# 返回一个TextIOWrapper对象，编码是区域设置中的默认值 print(fp2.encoding) print(fp2.read()) fp.close() @@ -15,5 +19,7 @@ fp3.close() fp4 = open('cafe.txt', 'rb') print(fp4) +# 'rb'标识指明在二进制模式中读取文件 +# 返回的是BufferedReader对象，而不是TextIOWrapper对象 print(fp4.read()) fp4.close() From b2b861a54d3a9cd243298bd25211888417871d25 Mon Sep 17 00:00:00 2001 From: huayongpan Date: Mon, 15 Oct 2018 12:31:01 +0800 Subject: [PATCH 11/26] Add chapter_02 examples --- 02-array-seq/example_2_11.py | 14 ++++++++++++++ 02-array-seq/example_2_17.py | 26 ++++++++++++++++++++++++++ 02-array-seq/example_2_18.py | 9 +++++++++ 02-array-seq/example_2_19.py | 13 +++++++++++++ 02-array-seq/example_2_20.py | 22 ++++++++++++++++++++++ 02-array-seq/example_2_21.py | 13 +++++++++++++ 02-array-seq/example_2_23.py | 14 ++++++++++++++ 7 files changed, 111 insertions(+) create mode 100644 02-array-seq/example_2_11.py create mode 100644 02-array-seq/example_2_17.py create mode 100644 02-array-seq/example_2_18.py create mode 100644 02-array-seq/example_2_19.py create mode 100644 02-array-seq/example_2_20.py create mode 100644 02-array-seq/example_2_21.py create mode 100644 02-array-seq/example_2_23.py diff --git a/02-array-seq/example_2_11.py b/02-array-seq/example_2_11.py new file mode 100644 index 0000000..8687930 --- /dev/null +++ b/02-array-seq/example_2_11.py @@ -0,0 +1,14 @@ +invoice = """ +0 6 40 52 55 +1909 Pimoroni PiBrella $17.50 3 $52.50 +1489 6mm Tactile Switch x20 $4.95 2 $9.90 +""" + +SKU = slice(0, 6) +DESCRIPTION = slice(6, 40) +UNIT_PRICE = slice(40, 52) +QUANTITY = slice(52, 55) +ITEM_TOTAL = slice(55, None) +line_items = invoice.split('\n')[2:] +for item in line_items: + print(item[UNIT_PRICE], item[DESCRIPTION]) \ No newline at end of file diff --git a/02-array-seq/example_2_17.py b/02-array-seq/example_2_17.py new file mode 100644 index 0000000..144599c --- /dev/null +++ b/02-array-seq/example_2_17.py @@ -0,0 +1,26 @@ +import bisect +import sys + +HAYSTACK = [1, 4, 5, 6, 8, 12, 15, 20, 21, 23, 23, 26, 29, 30] +NEEDLES = [0, 1, 2, 5, 8, 10, 22, 23, 29, 30, 31] + +ROW_FMT = '{0:2d} @ {1:2d} {2}{0:<2d}' + +def demo(bisect_fn): + for needle in reversed(NEEDLES): + position = bisect_fn(HAYSTACK, needle) + offset = position * ' |' + print(ROW_FMT.format(needle, position, offset)) + +if __name__ == '__main__': + # bisect 函数其实是bisect_right函数的别名 + # bisect_left返回的插入位置是原序列中跟被插入元素相等元素的位置的前面 + # bisect_right返回的插入位置是原序列中跟被插入元素相等元素的位置的后面 + if sys.argv[-1] == 'left': + bisect_fn = bisect.bisect_left + else: + bisect_fn = bisect.bisect + + print('DEMO:', bisect_fn.__name__) + print('haystack ->', ' '.join('%2d' % n for n in HAYSTACK)) + demo(bisect_fn) \ No newline at end of file diff --git a/02-array-seq/example_2_18.py b/02-array-seq/example_2_18.py new file mode 100644 index 0000000..855ac18 --- /dev/null +++ b/02-array-seq/example_2_18.py @@ -0,0 +1,9 @@ +import bisect + +def grade(score, breakpoints=[60, 70, 80, 90], grades='FDCBA'): + i = bisect.bisect(breakpoints, score) + return grades[i] + + +if __name__ == '__main__': + print([grade(score) for score in [33, 99, 77, 70, 89, 90, 100]]) \ No newline at end of file diff --git a/02-array-seq/example_2_19.py b/02-array-seq/example_2_19.py new file mode 100644 index 0000000..1e271ab --- /dev/null +++ b/02-array-seq/example_2_19.py @@ -0,0 +1,13 @@ +import bisect +import random + +SIZE = 7 + +random.seed(1729) + +my_list = [] + +for i in range(SIZE): + new_item = random.randrange(SIZE*2) + bisect.insort(my_list, new_item) + print('%2d ->' % new_item, my_list) \ No newline at end of file diff --git a/02-array-seq/example_2_20.py b/02-array-seq/example_2_20.py new file mode 100644 index 0000000..da0361d --- /dev/null +++ b/02-array-seq/example_2_20.py @@ -0,0 +1,22 @@ +from array import array +from random import random + +floats1 = array('d', (random() for i in range(10**7))) +print(floats1[-1]) + +fp = open('floats.bin', 'wb') +floats1.tofile(fp) +fp.close() + +fp = open('floats.txt', 'w') +for item in floats1: + fp.write(str(item) + '\n') +fp.close() + +floats2 = array('d') +fp = open('floats.bin', 'rb') +floats2.fromfile(fp, 10**7) +fp.close() +print(floats2[-1]) + +print('floats1 == floats2', floats1 == floats2) diff --git a/02-array-seq/example_2_21.py b/02-array-seq/example_2_21.py new file mode 100644 index 0000000..45612dd --- /dev/null +++ b/02-array-seq/example_2_21.py @@ -0,0 +1,13 @@ +from array import array + +numbers = array('h', [-2, -1, 0, 1, 2]) +memv = memoryview(numbers) +print('length of memoryview:', len(memv)) +print('the first element:', memv[0]) +#转换成单字节，查看numbers +memv_oct = memv.cast('B') +print(memv_oct.tolist()) +memv_oct[5] = 4 +#占2个字节的整数的高位字节改成了4 +print(numbers) + diff --git a/02-array-seq/example_2_23.py b/02-array-seq/example_2_23.py new file mode 100644 index 0000000..9e8f0a3 --- /dev/null +++ b/02-array-seq/example_2_23.py @@ -0,0 +1,14 @@ +from collections import deque + +dq = deque(range(10), maxlen=10) +print(dq) +dq.rotate(3) +print(dq) +dq.rotate(-4) +print(dq) +dq.appendleft(-1) +print(dq) +dq.extend([11, 22, 33]) +print(dq) +dq.extendleft([40, 30, 20, 10]) +print(dq) \ No newline at end of file From 0f5e641d99bb4430e62186cdcbff2ddf32181e43 Mon Sep 17 00:00:00 2001 From: huayongpan Date: Mon, 15 Oct 2018 12:31:29 +0800 Subject: [PATCH 12/26] Add chapter_03 examples --- 03-dict-set/example_3_5.py | 18 ++++++++++++++++++ 03-dict-set/example_3_7.py | 24 ++++++++++++++++++++++++ 03-dict-set/example_3_9.py | 22 ++++++++++++++++++++++ 3 files changed, 64 insertions(+) create mode 100644 03-dict-set/example_3_5.py create mode 100644 03-dict-set/example_3_7.py create mode 100644 03-dict-set/example_3_9.py diff --git a/03-dict-set/example_3_5.py b/03-dict-set/example_3_5.py new file mode 100644 index 0000000..ba9b19b --- /dev/null +++ b/03-dict-set/example_3_5.py @@ -0,0 +1,18 @@ +import sys +import re +import collections + +WORD_RE = re.compile(r'\w+') +index = collections.defaultdict(list) + +with open('./paragraph.txt', encoding='utf-8') as fp: + for line_no, line in enumerate(fp, 1): + for match in WORD_RE.finditer(line): + word = match.group() + column_no = match.start() + 1 + location = (line_no, column_no) + index[word].append(location) + + +for word in sorted(index, key=str.upper): + print(word, index[word]) \ No newline at end of file diff --git a/03-dict-set/example_3_7.py b/03-dict-set/example_3_7.py new file mode 100644 index 0000000..779c6dd --- /dev/null +++ b/03-dict-set/example_3_7.py @@ -0,0 +1,24 @@ +# +class StrKeyDict0(dict): + def __missing__(self, key): + if isinstance(key, str): + raise KeyError(key) + return self[str(key)] + + def get(self, key, default=None): + try: + return self[key] + except: + return default + + def __contains__(self, key): + return key in self.keys() or str(key) in self.keys() + +if __name__ == '__main__': + d = StrKeyDict0([('2', 'two'), ('4', 'four')]) + print(d['2']) + print(d[4]) + # print(d[1]) + print(d.get('2')) + print(d.get(4)) + print(d.get(1, 'N/A')) \ No newline at end of file diff --git a/03-dict-set/example_3_9.py b/03-dict-set/example_3_9.py new file mode 100644 index 0000000..e1adcee --- /dev/null +++ b/03-dict-set/example_3_9.py @@ -0,0 +1,22 @@ +from types import MappingProxyType + +d = { 1:'A'} +d_proxy = MappingProxyType(d) +print(d_proxy) +print(d_proxy[1]) +d_proxy[2] = 'x' + +d_proxy +Out[3]: mappingproxy({1: 'A'}) +d_proxy[2] = 'x' +# Traceback +# File "", line 1, in +# d_proxy[2] = 'x' +# TypeError: 'mappingproxy' object does not support item assignment +d_proxy +Out[5]: mappingproxy({1: 'A'}) +d[2] = 'B' +d_proxy +Out[7]: mappingproxy({1: 'A', 2: 'B'}) +d_proxy[2] +Out[8]: 'B' \ No newline at end of file From e8cc6ccffb04f9ccb13633aec54c328fed61d95a Mon Sep 17 00:00:00 2001 From: huayongpan Date: Mon, 15 Oct 2018 12:32:24 +0800 Subject: [PATCH 13/26] Add support materials --- 03-dict-set/paragraph.txt | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 03-dict-set/paragraph.txt diff --git a/03-dict-set/paragraph.txt b/03-dict-set/paragraph.txt new file mode 100644 index 0000000..018b329 --- /dev/null +++ b/03-dict-set/paragraph.txt @@ -0,0 +1,21 @@ +Brazilians will vote Sunday in presidential elections. +A total of 13 candidates are on the ballot. +The leading candidate is said to be 63-year-old Jair Bolsonaro of the Social Liberal Party. +He is supported by 35 percent of likely voters in the latest opinion survey. +During the election campaign, Bolsonaro has said that, if elected, he will help Brazil deal with a number of problems. +He has promised to take steps to reduce crime, strengthen the economy and fight corruption. +But many Brazilians are concerned about some of the statements Bolsonaro has made in the past. +Some believe many of his ideas are racist, homophobic and unfair to women. +Bolsonaro's supporters say tens of millions of Brazilians hope he will be elected, even if they will not say so to friends or family members. +In opinion surveys, his nearest opponent is Workers' Party candidate Fernando Haddad, who replaced former president Luiz Inacio Lula da Silva. +Lula is serving a 12-year prison sentence for corruption. Brazil's top electoral court barred him from serving as a candidate in August. +Last month, Lula told supporters, "I want everyone who would vote for me to vote for Fernando Haddad for president of Brazil. +From now on, he will be Lula for millions of Brazilians." +Haddad and Lula are said to be friends and similar in their political positions. +But for many voters in Brazil, the two men are also very different. +Lula served as the country's president between 2003 and 2011. +Haddad was mayor of Sao Paolo for four years, from 2013 to 2017. +Before becoming a candidate for mayor in 2012, Haddad served as Brazil's education minister under Lula and then former president Dilma Rousseff. +American Mark Jones has been watching the election campaign. +Jones is head of the Latin American Studies program at Rice University in Houston, Texas. +He says a Bolsonaro victory would represent a move away from traditional party candidates in Brazil. \ No newline at end of file From cd95fd53596a96131f6e4aaeb83997c062bf5500 Mon Sep 17 00:00:00 2001 From: huayongpan Date: Thu, 25 Oct 2018 09:44:05 +0800 Subject: [PATCH 14/26] Add example_4_10 --- 04-text-byte/example_4_10.py | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 04-text-byte/example_4_10.py diff --git a/04-text-byte/example_4_10.py b/04-text-byte/example_4_10.py new file mode 100644 index 0000000..26fbfa8 --- /dev/null +++ b/04-text-byte/example_4_10.py @@ -0,0 +1,19 @@ +fp = open('cafe.txt', 'w', encoding='utf-8') +print(fp) +print(fp.write('café')) +fp.close() +import os +print(os.stat('cafe.txt').st_size) +fp2 = open('cafe.txt') +print(fp2) +print(fp2.encoding) +print(fp2.read()) +fp.close() +fp3 = open('cafe.txt', encoding='utf-8') +print(fp3) +print(fp3.read()) +fp3.close() +fp4 = open('cafe.txt', 'rb') +print(fp4) +print(fp4.read()) +fp4.close() From c28dacd940105db6ae147076bccd9ce4902bb6b4 Mon Sep 17 00:00:00 2001 From: huayongpan Date: Thu, 25 Oct 2018 10:05:08 +0800 Subject: [PATCH 15/26] Change the number of items --- 02-array-seq/example_2_20.py | 4 ++-- 04-text-byte/cafe.txt | 1 + 2 files changed, 3 insertions(+), 2 deletions(-) create mode 100644 04-text-byte/cafe.txt diff --git a/02-array-seq/example_2_20.py b/02-array-seq/example_2_20.py index da0361d..a7cec30 100644 --- a/02-array-seq/example_2_20.py +++ b/02-array-seq/example_2_20.py @@ -1,7 +1,7 @@ from array import array from random import random -floats1 = array('d', (random() for i in range(10**7))) +floats1 = array('d', (random() for i in range(10**3))) print(floats1[-1]) fp = open('floats.bin', 'wb') @@ -15,7 +15,7 @@ floats2 = array('d') fp = open('floats.bin', 'rb') -floats2.fromfile(fp, 10**7) +floats2.fromfile(fp, 10**3) fp.close() print(floats2[-1]) diff --git a/04-text-byte/cafe.txt b/04-text-byte/cafe.txt new file mode 100644 index 0000000..1c2e52c --- /dev/null +++ b/04-text-byte/cafe.txt @@ -0,0 +1 @@ +café \ No newline at end of file From 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+0.8773814819011445 +0.456172590073069 +0.917207419997926 From 02acaf33b3af37eb053d0ef4bbc8cf6f5f90439d Mon Sep 17 00:00:00 2001 From: huayongpan Date: Fri, 26 Oct 2018 11:55:21 +0800 Subject: [PATCH 17/26] Add example 4 10 --- 04-text-byte/example_4_10.py | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/04-text-byte/example_4_10.py b/04-text-byte/example_4_10.py index 26fbfa8..d36fcf0 100644 --- a/04-text-byte/example_4_10.py +++ b/04-text-byte/example_4_10.py @@ -1,11 +1,15 @@ fp = open('cafe.txt', 'w', encoding='utf-8') print(fp) +# <_io.TextIOWrapper name='cafe.txt' mode='w' encoding='utf-8'> +# 默认情况下，open函数采用文本模式，返回一个TextIOWrapper对象 print(fp.write('café')) +# 在TextIOWrapper对象上调用write方法返回写入的Unicode字符数：4 fp.close() import os print(os.stat('cafe.txt').st_size) fp2 = open('cafe.txt') print(fp2) +# 返回一个TextIOWrapper对象，编码是区域设置中的默认值 print(fp2.encoding) print(fp2.read()) fp.close() @@ -15,5 +19,7 @@ fp3.close() fp4 = open('cafe.txt', 'rb') print(fp4) +# 'rb'标识指明在二进制模式中读取文件 +# 返回的是BufferedReader对象，而不是TextIOWrapper对象 print(fp4.read()) fp4.close() From e297c0cd45c148c231c828af5e0f07a21735421a Mon Sep 17 00:00:00 2001 From: huayongpan Date: Sat, 27 Oct 2018 17:07:45 +0800 Subject: [PATCH 18/26] Add example 4 11 --- 04-text-byte/example_4_11.py | 6 ++++++ 1 file changed, 6 insertions(+) create mode 100644 04-text-byte/example_4_11.py diff --git a/04-text-byte/example_4_11.py b/04-text-byte/example_4_11.py new file mode 100644 index 0000000..91cd876 --- /dev/null +++ b/04-text-byte/example_4_11.py @@ -0,0 +1,6 @@ +import sys, locale + +expressions = """ + locale.getpreferredencoding() + type(my_file) +""" \ No newline at end of file From 18ba6ed5cee8bd0b2e3ccab336a6e59c88257c60 Mon Sep 17 00:00:00 2001 From: huayongpan Date: Mon, 29 Oct 2018 10:11:29 +0800 Subject: [PATCH 19/26] Add the rest codes to example_4_11 --- 04-text-byte/example_4_11.py | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/04-text-byte/example_4_11.py b/04-text-byte/example_4_11.py index 91cd876..0976071 100644 --- a/04-text-byte/example_4_11.py +++ b/04-text-byte/example_4_11.py @@ -3,4 +3,18 @@ expressions = """ locale.getpreferredencoding() type(my_file) -""" \ No newline at end of file + my_file.encoding + sys.stdout.isatty() + sys.stdout.encoding + sys.stdin.isatty() #是否输出到控制台 + sys.stdin.encoding + sys.stderr.isatty() + sys.stderr.encoding + sys.getdefaultencoding() + sys.getfilesystemencoding() +""" + +my_file = open('dummy', 'w') +for expression in expressions.split(): + value = eval(expression) + print(expression.rjust(30), '->', repr(value)) \ No newline at end of file From 34650adc5f09158db6846d49a8cc2b00faf1b35b Mon Sep 17 00:00:00 2001 From: huayongpan Date: Fri, 2 Nov 2018 10:13:03 +0800 Subject: [PATCH 20/26] Add example 4 14 --- 04-text-byte/example_4_14.py | 11 +++++++++++ 1 file changed, 11 insertions(+) create mode 100644 04-text-byte/example_4_14.py diff --git a/04-text-byte/example_4_14.py b/04-text-byte/example_4_14.py new file mode 100644 index 0000000..4906544 --- /dev/null +++ b/04-text-byte/example_4_14.py @@ -0,0 +1,11 @@ +import unicodedata +import string + +def shave_marks(txt): + """drop all makrs""" + norm_txt = unicodedata.normalize('NFD', txt) + shaved = ''.join(c for c in norm_txt if not unicodedata.combining(c)) + return unicodedata.normalize('NFC', shaved) + +if __name__ == '__main__': + print(shave_marks('cafe\u0301')) From a310b26cc18476c9694377f529583a8aa44adcaf Mon Sep 17 00:00:00 2001 From: huayongpan Date: Tue, 6 Nov 2018 18:01:01 +0800 Subject: [PATCH 21/26] Add example 5 8 --- 05-1class-func/example_5_8.py | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 05-1class-func/example_5_8.py diff --git a/05-1class-func/example_5_8.py b/05-1class-func/example_5_8.py new file mode 100644 index 0000000..0be1992 --- /dev/null +++ b/05-1class-func/example_5_8.py @@ -0,0 +1,22 @@ +import random + +class BingoCage: + def __init__(self, items): + self._items = list(items) + random.shuffle(self._items) + + def pick(self): + try: + return self._items.pop() + except IndexError: + raise LookupError('pick from empty BingoCage') + + def __call__(self): + return self.pick() + + +if __name__ == '__main__': + bingo = BingoCage(range(3)) + print(bingo.pick()) + print(bingo()) + print(callable(bingo)) \ No newline at end of file From 65d9b721fad67f6f8dcbb4209b654b7dc0676b02 Mon Sep 17 00:00:00 2001 From: huayongpan Date: Mon, 12 Nov 2018 17:59:55 +0800 Subject: [PATCH 22/26] Add example 5-5,6,23,24,26 --- 05-1class-func/example_5_23.py | 55 ++++++++++++++++++++++++++++++++++ 05-1class-func/example_5_24.py | 34 +++++++++++++++++++++ 05-1class-func/example_5_26.py | 5 ++++ 05-1class-func/example_5_5.py | 11 +++++++ 05-1class-func/example_5_6.py | 5 ++++ 5 files changed, 110 insertions(+) create mode 100644 05-1class-func/example_5_23.py create mode 100644 05-1class-func/example_5_24.py create mode 100644 05-1class-func/example_5_26.py create mode 100644 05-1class-func/example_5_5.py create mode 100644 05-1class-func/example_5_6.py diff --git a/05-1class-func/example_5_23.py b/05-1class-func/example_5_23.py new file mode 100644 index 0000000..b519886 --- /dev/null +++ b/05-1class-func/example_5_23.py @@ -0,0 +1,55 @@ +metro_data = [ + ('Tokyo', 'JP', 36.933, (35.6897222, 139.691667)), + ('Delhi NCR', 'IN', 21.935, (28.613889, 77.208889)), + ('Mexico City', 'MX', 20.142, (19.433333, -99.1333333)), + ('New York-Newark', 'US', 20.104, (40.808611, -74.020386)), + ('Sao Paulo', 'BR', 19.649, (-23.547778, -46.635833)), +] +from operator import itemgetter +for city in sorted(metro_data, key=itemgetter(1)): + print(city) + +''' +Output: + ('Sao Paulo', 'BR', 19.649, (-23.547778, -46.635833)) + ('Delhi NCR', 'IN', 21.935, (28.613889, 77.208889)) + ('Tokyo', 'JP', 36.933, (35.6897222, 139.691667)) + ('Mexico City', 'MX', 20.142, (19.433333, -99.1333333)) + ('New York-Newark', 'US', 20.104, (40.808611, -74.020386)) + +''' + +cc_name = itemgetter(1, 0) +for city in metro_data: + print(cc_name(city)) + +''' +Output: +('JP', 'Tokyo') +('IN', 'Delhi NCR') +('MX', 'Mexico City') +('US', 'New York-Newark') +('BR', 'Sao Paulo') + +''' +list_people = [ + {'name': 'Mike', 'age': 22, 'score': 90}, + {'name': 'Alice', 'age': 22, 'score': 90}, + {'name': 'Lee', 'age': 26, 'score': 92}, + {'name': 'Ben', 'age': 26, 'score': 85}, + {'name': 'Tom', 'age': 33, 'score': 90}, + {'name': 'Jill', 'age': 41, 'score': 72} +] + +for person in sorted(list_people, key = itemgetter('age', 'name')): + print(person) + +''' +Output: +{'name': 'Alice', 'score': 90, 'age': 22} +{'name': 'Mike', 'score': 90, 'age': 22} +{'name': 'Ben', 'score': 85, 'age': 26} +{'name': 'Lee', 'score': 92, 'age': 26} +{'name': 'Tom', 'score': 90, 'age': 33} +{'name': 'Jill', 'score': 72, 'age': 41} +''' \ No newline at end of file diff --git a/05-1class-func/example_5_24.py b/05-1class-func/example_5_24.py new file mode 100644 index 0000000..2bac983 --- /dev/null +++ b/05-1class-func/example_5_24.py @@ -0,0 +1,34 @@ +from collections import namedtuple + +metro_data = [ + ('Tokyo', 'JP', 36.933, (35.6897222, 139.691667)), + ('Delhi NCR', 'IN', 21.935, (28.613889, 77.208889)), + ('Mexico City', 'MX', 20.142, (19.433333, -99.1333333)), + ('New York-Newark', 'US', 20.104, (40.808611, -74.020386)), + ('Sao Paulo', 'BR', 19.649, (-23.547778, -46.635833)), +] + + +LatLong = namedtuple('LatLong', 'lat long') +Metropolis = namedtuple('Metropolis', 'name cc pop coord') + +metro_areas = [Metropolis(name, cc, pop, LatLong(lat, long)) + for name, cc, pop, (lat, long) in metro_data] + +print(metro_areas[0]) +print(metro_areas[0].coord.lat) +#Output: Metropolis(name='Tokyo', cc='JP', pop=36.933, coord=LatLong(lat=35.6897222, long=139.691667)) +# 35.6897222 + +from operator import attrgetter +name_lat = attrgetter('name', 'coord.lat') +for city in sorted(metro_areas, key=attrgetter('coord.lat')): + print(name_lat(city)) +''' +Output: +('Sao Paulo', -23.547778) +('Mexico City', 19.433333) +('Delhi NCR', 28.613889) +('Tokyo', 35.6897222) +('New York-Newark', 40.808611) +''' \ No newline at end of file diff --git a/05-1class-func/example_5_26.py b/05-1class-func/example_5_26.py new file mode 100644 index 0000000..8c43498 --- /dev/null +++ b/05-1class-func/example_5_26.py @@ -0,0 +1,5 @@ +from operator import mul +from functools import partial + +triple = partial(mul, 3) +print(triple(7)) \ No newline at end of file diff --git a/05-1class-func/example_5_5.py b/05-1class-func/example_5_5.py new file mode 100644 index 0000000..ae2b48b --- /dev/null +++ b/05-1class-func/example_5_5.py @@ -0,0 +1,11 @@ +def factorial(n): + return 1 if n < 2 else n * factorial(n-1) + +print(list(map(factorial, range(6)))) +# [1, 1, 2, 6, 24, 120] +print([factorial(n) for n in range(6)]) +# [1, 1, 2, 6, 24, 120] +print(list(map(factorial, filter(lambda n: n%2, range(6))))) +# [1, 6, 120] +print([factorial(n) for n in range(6) if n % 2]) +# [1, 6, 120] \ No newline at end of file diff --git a/05-1class-func/example_5_6.py b/05-1class-func/example_5_6.py new file mode 100644 index 0000000..f96dab1 --- /dev/null +++ b/05-1class-func/example_5_6.py @@ -0,0 +1,5 @@ +from functools import reduce +from operator import add + +print(reduce(add, range(100))) +print(sum(range(100))) \ No newline at end of file From 93f91ec4a39ce40294fd98e52a9dd726443ee90c Mon Sep 17 00:00:00 2001 From: huayp Date: Tue, 13 Nov 2018 17:02:35 +0800 Subject: [PATCH 23/26] Add chapter 6 examples --- 06-dp-1class-func/example_6_1.py | 86 ++++++++++++++++++++++++++++++++ 06-dp-1class-func/example_6_3.py | 73 +++++++++++++++++++++++++++ 2 files changed, 159 insertions(+) create mode 100644 06-dp-1class-func/example_6_1.py create mode 100644 06-dp-1class-func/example_6_3.py diff --git a/06-dp-1class-func/example_6_1.py b/06-dp-1class-func/example_6_1.py new file mode 100644 index 0000000..56aa89f --- /dev/null +++ b/06-dp-1class-func/example_6_1.py @@ -0,0 +1,86 @@ +from abc import ABC, abstractmethod +from collections import namedtuple + +Customer = namedtuple('Customer', 'name fidelity') + +class LineItem: + def __init__(self, product, quantity, price): + self.product = product + self.quantity = quantity + self.price = price + + def total(self): + return self.price * self.quantity + +class Order: + def __init__(self, customer, cart, promotion=None): + self.customer = customer + self.cart = list(cart) + self.promotion = promotion + + def total(self): + if not hasattr(self, '__total'): + self.__total = sum(item.total() for item in self.cart) + return self.__total + + def due(self): + if self.promotion is None: + discount = 0 + else: + discount = self.promotion.discount(self) + return self.total() - discount + + def __repr__(self): + fmt = '' + return fmt.format(self.total(), self.due()) + +""" +把Promotion定义为抽象基类 Abstract Base Class, ABC +为了使用@Abstractmentod装饰器，从而表明所用的模式 +""" +class Promotion(ABC): + @abstractmethod + def discount(self, order): + """返回折扣金额>0""" + + +class FidelityPromo(Promotion): + """积分>=1000的顾客提供5%折扣""" + def discount(self, order): + return order.total() * 0.05 if order.customer.fidelity >= 1000 else 0 + +class BulkItemPromo(Promotion): + """单个商品为20个及以上时提供10%折扣""" + def discount(self, order): + discount = 0 + for item in order.cart: + if item.quantity >= 20: + discount += item.total() * 0.1 + return discount + +class LargeOrderPromo(Promotion): + """订单中的不同商品达到10个或以上时提供7%折扣""" + def discount(self, order): + distinct_items = {item.product for item in order.cart} + if len(distinct_items) >= 10: + return order.total() * 0.07 + return 0 + + +if __name__ == '__main__': + joe = Customer('John Doe', 0) + ann = Customer('Ann Smith', 1100) + cart = [LineItem('banana', 4, 0.5), + LineItem('apple', 10, 1.5), + LineItem('watermellon', 5, 5.0)] + fidelityPromo_instance = Order(joe, cart, FidelityPromo()) + print(fidelityPromo_instance) + fidelityPromo_instance = Order(ann, cart, FidelityPromo()) + print(fidelityPromo_instance) + banana_cart = [LineItem('banan', 30, 0.5), + LineItem('apple', 10, 1.5)] + print(Order(joe, banana_cart, BulkItemPromo())) + long_order = [ LineItem(str(item_code), 1, 1.0) + for item_code in range(10) ] + print(Order(joe, long_order, LargeOrderPromo())) + print(Order(joe, cart, LargeOrderPromo())) \ No newline at end of file diff --git a/06-dp-1class-func/example_6_3.py b/06-dp-1class-func/example_6_3.py new file mode 100644 index 0000000..1fb0ba8 --- /dev/null +++ b/06-dp-1class-func/example_6_3.py @@ -0,0 +1,73 @@ +from collections import namedtuple + +Customer = namedtuple('Customer', 'name fidelity') + +class LineItem: + def __init__(self, product, quantity, price): + self.product = product + self.quantity = quantity + self.price = price + + def total(self): + return self.price * self.quantity + +class Order: + def __init__(self, customer, cart, promotion=None): + self.customer = customer + self.cart = list(cart) + self.promotion = promotion + + def total(self): + if not hasattr(self, '__total'): + self.__total = sum(item.total() for item in self.cart) + return self.__total + + def due(self): + if self.promotion is None: + discount = 0 + else: + discount = self.promotion(self) + return self.total() - discount + + def __repr__(self): + fmt = '' + return fmt.format(self.total(), self.due()) + + +def fidelity_promo(order): + """积分>=1000的顾客提供5%折扣""" + return order.total() * 0.05 if order.customer.fidelity >= 1000 else 0 + +def bulk_item_promo(order): + """单个商品为20个及以上时提供10%折扣""" + discount = 0 + for item in order.cart: + if item.quantity >= 20: + discount += item.total() * 0.1 + return discount + +def large_order_promo(order): + """订单中的不同商品达到10个或以上时提供7%折扣""" + distinct_items = {item.product for item in order.cart} + if len(distinct_items) >= 10: + return order.total() * 0.07 + return 0 + + +if __name__ == '__main__': + joe = Customer('John Doe', 0) + ann = Customer('Ann Smith', 1100) + cart = [LineItem('banana', 4, 0.5), + LineItem('apple', 10, 1.5), + LineItem('watermellon', 5, 5.0)] + fidelityPromo_instance = Order(joe, cart, fidelity_promo) + print(fidelityPromo_instance) + fidelityPromo_instance = Order(ann, cart, fidelity_promo) + print(fidelityPromo_instance) + banana_cart = [LineItem('banan', 30, 0.5), + LineItem('apple', 10, 1.5)] + print(Order(joe, banana_cart, bulk_item_promo)) + long_order = [ LineItem(str(item_code), 1, 1.0) + for item_code in range(10) ] + print(Order(joe, long_order, large_order_promo)) + print(Order(joe, cart, large_order_promo)) \ No newline at end of file From 8483b6a91052236e5249e34830e86448ef72fc4a Mon Sep 17 00:00:00 2001 From: huayongpan Date: Fri, 23 Nov 2018 14:26:06 +0800 Subject: [PATCH 24/26] Add example 9-4 --- 09-pythonic-obj/example_9_4.py | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 09-pythonic-obj/example_9_4.py diff --git a/09-pythonic-obj/example_9_4.py b/09-pythonic-obj/example_9_4.py new file mode 100644 index 0000000..b14db88 --- /dev/null +++ b/09-pythonic-obj/example_9_4.py @@ -0,0 +1,27 @@ +''' +Compare classmethod and staticmethod +''' + +class Demo: + @classmethod + def klassmeth(*args): + return args + + @staticmethod + def statmeth(*args): + return args + + +if __name__ == '__main__': + print(Demo.klassmeth()) + print(Demo.klassmeth('spam')) + print(Demo.statmeth()) + print(Demo.statmeth('spam')) + +''' +Output: + (,) + (, 'spam') + () + ('spam',) +''' \ No newline at end of file From 85231871b7573dba41ee037c33031f51d0a45bb4 Mon Sep 17 00:00:00 2001 From: huayongpan Date: Fri, 23 Nov 2018 14:27:39 +0800 Subject: [PATCH 25/26] Add clock deco 2 --- 07-closure-deco/clockdeco2.py | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 07-closure-deco/clockdeco2.py diff --git a/07-closure-deco/clockdeco2.py b/07-closure-deco/clockdeco2.py new file mode 100644 index 0000000..8ea5f7d --- /dev/null +++ b/07-closure-deco/clockdeco2.py @@ -0,0 +1,32 @@ +# clockdeco2.py + +import time +import functools + + +def clock(func): + @functools.wraps(func) + def clocked(*args, **kwargs): + t0 = time.time() + result = func(*args, **kwargs) + elapsed = time.time() - t0 + name = func.__name__ + arg_lst = [] + if args: + arg_lst.append(', '.join(repr(arg) for arg in args)) + if kwargs: + pairs = ['%s=%r' % (k, w) for k, w in sorted(kwargs.items())] + arg_lst.append(','.join(pairs)) + arg_str = ','.join(arg_lst) + print('[%0.8fs] %s(%s) -> %r' % (elapsed, name, arg_str, result)) + return result + return clocked + + +@clock +def f1(a, b, c = 3): + return a + b + c + +if __name__ == '__main__': + f1(10, 100, c = 1) + f1(10, 100, c=1000) \ No newline at end of file From 07577e3e3ca822ab0e769bbaa22477fd988edb36 Mon Sep 17 00:00:00 2001 From: huayongpan Date: Mon, 10 Dec 2018 09:22:41 +0800 Subject: [PATCH 26/26] Add some examples --- 07-closure-deco/example_7_14.py | 16 ++++++++++++++++ 16-coroutine/example_16_1.py | 8 ++++++++ 16-coroutine/example_16_2.py | 26 ++++++++++++++++++++++++++ 3 files changed, 50 insertions(+) create mode 100644 07-closure-deco/example_7_14.py create mode 100644 16-coroutine/example_16_1.py create mode 100644 16-coroutine/example_16_2.py diff --git a/07-closure-deco/example_7_14.py b/07-closure-deco/example_7_14.py new file mode 100644 index 0000000..8cc6082 --- /dev/null +++ b/07-closure-deco/example_7_14.py @@ -0,0 +1,16 @@ +def make_averager(): + count = 0 + total = 0 + + def averager(new_value): + nonlocal count, total + count += 1 + total += new_value + return total/count + return averager + +if __name__ == '__main__': + avg = make_averager() + print(avg(10)) + print(avg(11)) + print(avg(12)) \ No newline at end of file diff --git a/16-coroutine/example_16_1.py b/16-coroutine/example_16_1.py new file mode 100644 index 0000000..67cbdb5 --- /dev/null +++ b/16-coroutine/example_16_1.py @@ -0,0 +1,8 @@ +def simple_coroutine(): + print('-> coroutine started') + x = yield + print('-> coroutine received: ', x) + +my_coro = simple_coroutine() +next(my_coro) +my_coro.send(42) \ No newline at end of file diff --git a/16-coroutine/example_16_2.py b/16-coroutine/example_16_2.py new file mode 100644 index 0000000..c7936c3 --- /dev/null +++ b/16-coroutine/example_16_2.py @@ -0,0 +1,26 @@ +def simple_coro2(a): + print('-> Started: a=', a) + b = yield a + print('-> Received: b= ', b) + c = yield a + b + print('-> Received: c=', c) + +my_coro2 = simple_coro2(14) +from inspect import getgeneratorstate +print(getgeneratorstate(my_coro2)) +# GEN_CREATED +print(next(my_coro2)) +# -> Started: a= 14 +# 14 +print(getgeneratorstate(my_coro2)) +# GEN_SUSPENDED +print(my_coro2.send(28)) +# -> Received: b= 28 +# 42 +print(my_coro2.send(99)) +# -> Received: c= 99 +# Traceback (most recent call last): +# ... +# StopIteration +print(getgeneratorstate(my_coro2)) +# GEN_CLOSED