def trim(s): if s == '': return s elif s[0] == ' ': return trim(s[1:]) elif s[-1] == ' ': return trim(s[:-1]) else: return s
if trim('hello ') != 'hello': print('测试失败!') elif trim(' hello') != 'hello': print('测试失败!') elif trim(' hello ') != 'hello': print('测试失败!') elif trim(' hello world ') != 'hello world': print('测试失败!') elif trim('') != '': print('测试失败!') elif trim(' ') != '': print('测试失败!') else: print('测试成功!')
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凌久殇
def trim(s): if s == '': return s elif s[0] == ' ': return trim(s[1:]) elif s[-1] == ' ': return trim(s[:-1]) else: return s
测试:
if trim('hello ') != 'hello': print('测试失败!') elif trim(' hello') != 'hello': print('测试失败!') elif trim(' hello ') != 'hello': print('测试失败!') elif trim(' hello world ') != 'hello world': print('测试失败!') elif trim('') != '': print('测试失败!') elif trim(' ') != '': print('测试失败!') else: print('测试成功!')