def trim(s):
if not s:
return s
if s[0] == '' or s[0] == ' ':
s = trim(s[1:])
elif s[-1] == '' or s[-1]==' ':
s = trim(s[:-1])
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雨夜桦
def trim(s):
if not s:
return s
if s[0] == '' or s[0] == ' ':
s = trim(s[1:])
elif s[-1] == '' or s[-1]==' ':
s = trim(s[:-1])
return s