solved 27

Author: JavaProgrammerLB

Diff for: 27.py

@@ -1,6 +1,8 @@
 import download_file
 
 from PIL import Image
+import bz2
+import py2keywords
 
 
 def main():
@@ -10,9 +12,12 @@ def main():
     user = "butter"
     password = "fly"
     # first_step(url, file_path, user, password)
-    raw, result = second_step(file_path)
+    im, raw, result = second_step(file_path)
     raw_ary, result_ary = third_step(raw, result)
-    fourth_step(raw_ary, result_ary)
+    raw_str, result, index = fourth_step(raw_ary, result_ary)
+    hint_path = "zigzag/{}".format("hint.png")
+    five_step(im, index, hint_path)
+    six_step(raw_str)
 
 
 def first_step(url, file_path, user, password):
@@ -27,7 +32,7 @@ def second_step(file_path):
     value = "".join([chr(palette[i]) for i in range(len(palette))])
     table = str.maketrans(index, value)
     result = raw.decode("latin1").translate(table).encode("latin1")
-    return raw, result
+    return im, raw, result
 
 
 def third_step(raw, result):
@@ -42,7 +47,44 @@ def third_step(raw, result):
 
 
 def fourth_step(raw_ary, result_ary):
-    pass
+    zero = raw_ary.pop(0)
+    raw_ary.append(zero)
+    assert len(raw_ary) == len(result_ary)
+    raw = []
+    result = []
+    index = []
+    for i in range(len(raw_ary)):
+        raw_i = raw_ary[i]
+        result_i = result_ary[i]
+        if raw_i != result_i:
+            raw.append(raw_i)
+            result.append(result_i)
+            index.append(i)
+    raw_str = b""
+    for i in range(len(raw)):
+        raw_str += chr(raw[i]).encode("latin1")
+    return raw_str, result, index
+
+
+def five_step(im, index, hint_path):
+    im2 = Image.new("RGB", im.size)
+    colors = [(255, 255, 255)] * (im2.size[0] * im2.size[1])
+    for i in index:
+        colors[i] = (0, 0, 255)
+    im2.putdata(colors)
+    im2.save(hint_path)
+    print("Hint in {}".format(hint_path))
+
+
+def six_step(raw_str):
+    raw_dec = bz2.decompress(raw_str)
+    strs = raw_dec.decode("latin1").split(" ")
+    results = set()
+    for i in range(len(strs)):
+        s = strs[i]
+        if not s in py2keywords.kwlist:
+            results.add(s)
+    print(results)
 
 
 if __name__ == "__main__":

Diff for: README.md

@@ -1,6 +1,14 @@
 # pythonchallenge
 Solve Problems in http://www.pythonchallenge.com
 
+#### 27 
+result: http://www.pythonchallenge.com/pc/ring/bell.html auth=(repeat, switch)
+- author use python2 keyword, but there is some different with python3
+- use assert to do assert
+- tobytes() method for Image in PIL: Return image as a bytes object.
+- getpalette() method for Image in PIL:  Returns the image palette as a list.
+
+
 #### 26
 result: http://www.pythonchallenge.com/pc/hex/speedboat.html
 ```python

Diff for: py2keywords.py

@@ -0,0 +1 @@
+kwlist = ['and', 'as', 'assert', 'break', 'class', 'continue', 'def', 'del', 'elif', 'else', 'except', 'exec', 'finally', 'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'not', 'or', 'pass', 'print', 'raise', 'return', 'try', 'while', 'with', 'yield']