pychallenge之三
题目还是下面一幅图配上一段话。
One small letter, surrounded by EXACTLY three big bodyguards on each of its sides.
纸面意思是一个小写字母被两边各三个大家伙包围着，其中着重加粗的EXACTLY表明只能正好是三个，
不能多也不能少。和之前一样看网页source发现一段文字，代码如下：
1 # -*- coding: utf-8 -*-
2 import re
3
4 def findwk(file):
5 """
6 :type file: str
7 :rtype: list
8 """
9 result = []
10 with open(file) as f:
11 cont = f.read()
12 result = re.findall('[^A-Z][A-Z]{3}[a-z][A-Z]{3}[^A-Z]', cont)
13
14 return [word[4] for word in result]
15
16 if __name__ == '__main__':
17 print findwk('C:\Users\Katsu\Desktop\pych3.txt')
运行结果得：
C:\Python27\python.exe D:/Py/test/test.py
['l', 'i', 'n', 'k', 'e', 'd', 'l', 'i', 's', 't']
组合下应该是linkedlist.