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试试

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-- coding:utf-8 --

def trim(s): while s[0] == ' ': s = s[1:len(s)]

while s[-1] == ' ':
    s = s[0:-2]
return s

string = input('please input>>') print(trim(string))

复制粘贴过来缩进出问题了,下面这个可以了

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-- coding:utf-8 --

def trim(s): while s[0] == ' ': s = s[1:len(s)] while s[-1] == ' ': s = s[0:-2] return s string = input('please input>>') print(trim(string))


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