def trim(s):
n=0
while s[n]==' ':
n=n+1
s=s[n:]
m=-1
while s[m]==' ':
m=m-1
s=s[:m+1]
return s
trim(' wx ')
print(trim)
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算稳态误差先判稳
def trim(s):
n=0
while s[n]==' ':
n=n+1
s=s[n:]
m=-1
while s[m]==' ':
m=m-1
s=s[:m+1]
return s
trim(' wx ')
print(trim)