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交作业

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毛线qwe

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

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