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作业

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pink

#1 Created at ... [Delete] [Delete and Lock User] 
def trim(s):
    if s == '':
        return ''    
    elif s[0] == ' ':
        return trim(s[1:])
    elif s[-1] == ' ':
        return trim(s[:-1])

pink

#2 Created at ... [Delete] [Delete and Lock User]

最下面还有行return s

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