if not s :
return ''
while True:
if s[0] == ' ':
s = s[1:]
if s[-1] == ' ':
s = s[:-1]
if s == '' or (( s[0] != ' ' ) and ( s[-1] != ' ' )) :
break
return s
if s == '':
elif s[-1] == ' ':
return trim(s[:-1])
elif s[0] == ' ':
return trim(s[1:])
else:
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冰块ZJ
if not s :
return ''
while True:
if s[0] == ' ':
s = s[1:]
if s[-1] == ' ':
s = s[:-1]
if s == '' or (( s[0] != ' ' ) and ( s[-1] != ' ' )) :
break
return s