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参考了大家的评论，磕磕绊绊写了出来

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en我是太阳会发光

#1 Created at ... [Delete] [Delete and Lock User] 
if len(s)==0:
    return s
else:
    while s[0]==' ':
        s=s[1:]
        if len(s)==0:
            return s
    while s[-1]==' ':
            s=s[:-1]
    return s
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