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#1 Created at ... [Delete] [Delete and Lock User] 
#避免越界用s[:1]替代s[0]
    while s[:1] == ' ':
          s = s[1:]
    while s[-1:] == ' ':
          s = s[:-1]
    return s

橘子水汽

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

避免越界是什么意思？不太明白为什么这里不能用s[0]

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