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去除首尾多个空格的解法

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def trim(s): m=0
n=0 for i in range(0,len(s)-1): if s[i]!=' ':
break else: m=m+1 for j in range(0,len(s)-1):
if s[-1-j]!=' ': break else: n=n+1 s=s[m:len(s)-n] return s


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