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交作业

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湖与海海

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

def trim(s):

if not s:

return s

elif s[:1]==' ':

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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