一直报错，但是找不到原因……

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#1 Created at ... [Delete] [Delete and Lock User]

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 ')

#2 Created at ... [Delete] [Delete and Lock User]

改成这样就好了，因为：i=0 和 j=len(arge)-1 不能再一行上，或者可以写成这样：i,j=0,len(arge)-1

def trim(ss):

i=0

j=len(ss)-1

while ss[i]==' ':

i=i+1

while ss[j]==' ':

j=j-1

return ss[i:j]

trim(' abc ')

#3 Created at ... [Delete] [Delete and Lock User]

你这个把字母c截掉了。。。第二次循环结束后，j指向的就是'c'，

#4 Created at ... [Delete] [Delete and Lock User]

哦对的，改为 return ss[i:j+1]