if s == '' or s==' ':
s = ''
else:
while s[0] == ' ':
s = s[1:]
while s[-1]== ' ':
s = s[:-1]
return s
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浪漫的丶差不多
if s == '' or s==' ':
s = ''
else:
while s[0] == ' ':
s = s[1:]
while s[-1]== ' ':
s = s[:-1]
return s