while s[:1] == ' ' :
s = s[1:]
while s[-1:] == ' ' :
s = s[:-1]
return s
请问为什么使用s[0]==' '和s[-1] == ' '判断会报错，说是超出范围了？
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赏侬十巴掌
while s[:1] == ' ' :
s = s[1:]
while s[-1:] == ' ' :
s = s[:-1]
return s