求大佬指教，为什么输出与输入是一样的

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求大佬指教，为什么输出与输入是一样的

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lu学习

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

def trim(s):

if s[0]==' ':

return s[1:]

elif s[-1]==' ':

return s[:-1]

elif s[0]==' ' and s[-1]==' ':

return s[1:-1]

else:

return s

s=input('请输入:')

print(trim(s))

input()

Co-terwin

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

请问你知道原因了吗？我跟你是一样的

无聊的泡儿

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

def test(s):    if len(s) > 0:        if s[0] == A:            return test(s[1:])        elif s[-1] == A:            return test(s[:-1])        return sA = input('选择前后需要剔除的:')B = input('请随便输入一段:')print(test(B))

无聊的泡儿

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

# -*- coding: utf-8 -*-

def test(s):

if len(s) > 0:

if s[0] == A:

return test(s[1:])

elif s[-1] == A:

return test(s[:-1])

return s

A = input('选择前后需要剔除的:')

B = input('请随便输入一段:')

print(test(B))