def trim(s):
while s[0:1] == ' ':
s = s[1:]
while s[-2:-1] == ' ':
s = s[0:-2]
return s
第二个while里 s[-2:-1]应该是s[-1:],s[0:-2]应该是s[0:-1]
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我更好呀
def trim(s):
while s[0:1] == ' ':
s = s[1:]
while s[-2:-1] == ' ':
s = s[0:-2]
return s