if len(s)!=0:
while s[:1]==" ":
s=s[1:]
while s[-1:]==" ":
s=s[:-1]
return s
正解！
要是不只一个空格就不对了
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天沢
if len(s)!=0:
while s[:1]==" ":
s=s[1:]
while s[-1:]==" ":
s=s[:-1]
return s