Question

为什么我的加密功能只返回第一个翻译的字母？（我已经删除了解密和暴力功能）。这个问题可能很小，但我对此并不熟悉，而且我已经盯着它看了太长时间没有任何东西可以进入我的脑海。

import string

def encrypt(message,key):
    cryptotext=""
    for character in message:
        if character in string.uppercase:
            old_ascii=ord(character)
            new_ascii=(old_ascii+key-65)%26+65
            new_char=chr(new_ascii)
            cryptotext+=new_char
            return cryptotext

        elif character in string.lowercase:
            old_ascii=ord(character)
            new_ascii=(old_ascii+key-97)%26+97
            new_char=chr(new_ascii)
            cryptotext += new_char
            return cryptotext

        else:
            return character

Answer 1

return语句从当前循环中断，这意味着加密函数应该等到循环返回之后：另请注意，如果字符不是大写或小写，则应附加字符，否则只会返回第一个错误的字母。
所以encrypt(message,key)应该是这样的：

def encrypt(message,key):
    cryptotext=""
    for character in message:
        if character in string.uppercase:
            old_ascii=ord(character)
            new_ascii=(old_ascii+key-65)%26+65
            new_char=chr(new_ascii)
            cryptotext+=new_char


        elif character in string.lowercase:
            old_ascii=ord(character)
            new_ascii=(old_ascii+key-97)%26+97
            new_char=chr(new_ascii)
            cryptotext += new_char


        else:
            #Also, append character to cryptotext instead of returning it
            cryptotext+= character
    return cryptotext

Answer 2

您将return语句放在循环中。这意味着在第一次迭代后退出函数，结果只有一个字符。

您的代码应如下所示：

cryptotext = ""
for character in message:
    # ...
    # do the encryption, without returning
    # ...
return cryptotext # after the loop has finished

凯撒密码只返回第一个翻译的字母？

2 个答案: