def trim(s):
flag=True
while(flag):
if len(s)==0:
flag=False
s=s
elif s[0]==" ":
s=s[1:]
elif s[-1]==" ":
s=s[:-1]
else:
return s
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我可能会炸
def trim(s):
flag=True
while(flag):
if len(s)==0:
flag=False
s=s
elif s[0]==" ":
s=s[1:]
elif s[-1]==" ":
s=s[:-1]
else:
flag=False
return s