python 字符串替换
python字符串替换有两种方法：1. replace
>>> s = 'the table of contents for the book lists all of the modules covered'
>>> s.replace('e','2')
7: 'th2 tabl2 of cont2nts for th2 book lists all of th2 modul2s cov2r2d'
只能进行单一的替换，可以对一个大的字符串替换
2. 用maketrans和translate
>>> s
10: 'the table of contents for the book lists all of the modules covered'
>>> leet = string.maketrans('aefcro','123456')
>>> s.translate(leet)
11: 'th2 t1bl2 63 46nt2nts 365 th2 b66k lists 1ll 63 th2 m6dul2s 46v252d'
可以进行多个的替换，缺点是对字符串整个替换不好
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