想问一下大家当我输入一个字符串“ hello ”是可以成功的，但是输入[ ,1,2,3,4, ] 就没办法成功，上面这个是还应该怎么更改吗？

Discuss / Python / 想问一下大家当我输入一个字符串“ hello ”是可以成功的，但是输入[ ,1,2,3,4, ] 就没办法成功，上面这个是还应该怎么更改吗？

Back

Topic source

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

def trim(S):

if S[:1]==" ":

return trim(S[1:])

elif S[-1:]==" ":

return trim(S[:-1])

return S

print(trim(" hhhhello "))

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

if s=="":

return s

while s[:1]==" ":

s=s[1:]

while s[-1:]==" ":

s=s[:-1]

return s

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

在while循环之前进行判定，如果是空反馈原字符串即可。