def trim(s):
if s[:1]==' ':
return trim(s[1:])
elif s[-1:]==' ':
return trim(s[:-2])
else:
return s
感觉应该是这样吧：
return trim(s[:-1])
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☆◇﹏Kevin
def trim(s):
if s[:1]==' ':
return trim(s[1:])
elif s[-1:]==' ':
return trim(s[:-2])
else:
return s