def trim(s):
if len(s) == 0:
return s
while s[0] == ' ':
s = s[1:]
while s[-1] == ' ':
s = s[:-1]
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用户0201478117
def trim(s):
if len(s) == 0:
return s
while s[0] == ' ':
s = s[1:]
if len(s) == 0:
return s
while s[-1] == ' ':
s = s[:-1]
if len(s) == 0:
return s
return s