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测试成功

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

def trim(s):

    a = 0

    b = 0

    for i in s:

        if i != ' ':

            break

        else:

            a = a + 1

    for i in s[-1::-1]:

        if i != ' ':

            break

        else:

            b = b + 1

    s = s[a:len(s)-b]

    return s


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