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交作业

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menfrexu

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

这里的思路是截掉两边的 ' '

    if len(s) == 0:
        return ''
    left = 0
    for i in range(0, len(s)):
        if s[i] == ' ':
            left = left + 1
        else: 
            break
    s = s[left:]

    right = len(s)
    for i in range(0, len(s)):
        i = (i + 1) * -1
        if s[i] == ' ':
            right = right - 1
        else:
            break

    return s[0:right]

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