如何在Python的字符串中替换某些字符串?

问题描述

我正在尝试编写两个过程来替换python中字符串中的匹配字符串.而且我必须编写两个过程.

I am trying to write two procedures to replace matched strings in a string in python.And I have to write two procedures.

defmatched_case(旧旧):.........

def matched_case(old new):.........

注意:输入是两个字符串，它将返回一个替换转换器.

note: inputs are two strings, it returns a replacement converter.

def替换(x，another_string):.....

def replacement(x,another_string):..........

注意:输入是上一过程的转换器和一个字符串.它返回将转换器应用于输入字符串的结果.

note:inputs are a converter from previous procedure, and a string. It returns the result of applying the converter to the input string.

例如:

a = matched_case('mm','m')
print replacement(a, 'mmmm')
it should return m

另一个例子:

R = matched_case('hih','i')
print replacement(R, 'hhhhhhihhhhh')
it should return hi

我不确定如何使用循环来完成整个操作.非常感谢任何人都可以给出提示.

I am not sure how can I use loop to do the whole thing. Thanks so much for anyone can give a hint.

推荐答案

def subrec(pattern, repl, string):
    while pattern in string:
        string = string.replace(pattern, repl)
    return string

foo('mm', 'm', 'mmmm')返回m

foo('hih', 'i', 'hhhhhhihhhhh')返回hi

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