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交作业

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roc风羿

#1 Created at ... [Delete] [Delete and Lock User] 
    while len(s) > 0:
        if s[0] == ' ':
            s = s[1:]
        elif s[-1] == ' ':
            if len(s) == 1:
                s = ''
            else:
                s = s[: -1]
        else:
            return s
    if len(s) == 0:
        s = ''
    return s

roc风羿

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

答案二：（递归方式）

    if len(s) == 0:
        s = ''
    else:
        if s[0] == ' ':
            return trim(s[1:])
        if s[-1] == ' ':
            return trim(s[:-1])
    return s
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