def trim(s):
if len(s)*' '==s:
s=''
return s
else:
while s[0]==" ":
s = s[1:]
while s[-1] == " ":
s = s[:-2]
if s[0] != " " and s[-1] != " ":
return trim(s)
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我的快乐时代
def trim(s):
if len(s)*' '==s:
s=''
return s
else:
while s[0]==" ":
s = s[1:]
while s[-1] == " ":
s = s[:-2]
if s[0] != " " and s[-1] != " ":
return s
else:
return trim(s)