def trim(s): if len(s) == 0: return s elif s[:1] == " ": return trim(s[1:]) elif s[-1] == " ": return trim(s[:-1]) else: return s
用这段代码测试结果是失败的
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xinyujaychou
def trim(s): if len(s) == 0: return s elif s[:1] == " ": return trim(s[1:]) elif s[-1] == " ": return trim(s[:-1]) else: return s