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试试

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cacaty

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

    while len(s) > 0:

        if s[0] == ' ':

            s = s[1:]

        else:

            break

    while len(s) > 0:

        if s[-1] == ' ':

            s = s[:-1]

        else:

            break

    return s


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