def trim(s):
if len(s) ==0:
return s
else:
x=0
y=0
for i in s:
if i != " ":
break
x+=1
for p in s[::-1]:
if p != " ":
y+=1
return s[x:len(s)-y]
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不一样的小肚子
def trim(s):
if len(s) ==0:
return s
else:
x=0
y=0
for i in s:
if i != " ":
break
x+=1
for p in s[::-1]:
if p != " ":
break
y+=1
return s[x:len(s)-y]