def trim(arge):
i=0,j=len(arge)-1
while arge[i]==' ':
i=i+1
while arge[j]==' ':
j=j-1
print(arge[i:j])
trim(' abc ')
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竹叶lcc
def trim(arge):
i=0,j=len(arge)-1
while arge[i]==' ':
i=i+1
while arge[j]==' ':
j=j-1
print(arge[i:j])
trim(' abc ')