Python 2.7.5 Palindrome代码混淆

Question

所以我在这里四处寻找,我找到了工作回文的代码

def isPalindrome():
    string = input('Enter a string: ')
    string1 = string[::-1]
    if string[0] == string[(len(string)-1)] and string[1:(len(string)-2)] == string1[1:(len(string)-2)]:
        print('It is a palindrome')
    else:
        print('It is not a palindrome')

isPalindrome()

所以我已经将输入更改为raw_input.它有效.

但在评论中有一个更简单的代码:

def isPalindrome():
    string1 = input('Enter a string: ')
    string2 = string[::-1]
    if string1 == string2:
        return 'It is a palindrome'
    return 'It is not a palindrome'

isPalindrome()

我收到了回读:

Traceback (most recent call last):
  File "C:\Python27\idk1.py", line 8, in <module>
    isPalindrome()
  File "C:\Python27\idk1.py", line 2, in isPalindrome
    string1 = input('Enter a string: ')
  File "<string>", line 1, in <module>
NameError: name 'racecar' is not defined

所以我把它改成了raw_input,我根本不会工作.我很好奇为什么会这样？

Answer 1

我的朋友,你有复制粘贴的问题.您复制了源,更改了变量名称但忘记检查整个程序中的变量使用:

def isPalindrome():
  string1 = input('Enter a string: ')
  string2 = string1[::-1] #notice it's string1, not string.
  if string1 == string2:
    [code]