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递归处理加空字符处理

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90丶无悔

#1 Created at ... [Delete] [Delete and Lock User] 
def trim(s):    if s == "" or s == " ":        return ""    elif s[0] == " ":        s = s[1:]        return trim(s)    elif s[-1] == " ":        s = s[:-1]        return trim(s)    else:        return s

90丶无悔

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

输入时为 python 格式，评论后就没有格式了?

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