试图为加密代码索引关键字

Question

我使用字母表列表，用户输入关键字，关键字被索引并添加到您想要加密的文本中。但是，如果它多于一个字符，它会这样做。'ab'只会被识别为最后一个字符;用'2'代替'3'。请帮忙，提前谢谢

key = [123, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k',
   'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
   'x', 'y', 'z']
def encrypt(k, plaintext):
    result = ''
    for l in k:
        try:
            p = (key.index(l)) %26
            print p
    except ValueError:
        result += 1
    for l in plaintext:
        try:
           i = (key.index(l) + p) %26
           result += key[i]
           print i
    except ValueError:
        result += l
    return result.upper()

Answer 1

如果您正在实现Caesar密码，您可能想看看这个，它取自这里https://inventwithpython.com/chapter14.html

MAX_KEY_SIZE = 26
def getMode():
    while True:
        print('Do you wish to encrypt or decrypt a message?')
        mode = input().lower()
        if mode in 'encrypt e decrypt d'.split():
            return mode
        else:
            print('Enter either "encrypt" or "e" or "decrypt" or "d".')
def getMessage():
    print('Enter your message:')
    return input()
def getKey():
    key = 0
    while True:
         print('Enter the key number (1-%s)' % (MAX_KEY_SIZE))
         key = int(input())
         if (key >= 1 and key <= MAX_KEY_SIZE):
            return key
def getTranslatedMessage(mode, message, key):
    if mode[0] == 'd':
         key = -key
    translated = ''
    for symbol in message:
        if symbol.isalpha():
            num = ord(symbol)
            num += key
            if symbol.isupper():
                if num > ord('Z'):
                    num -= 26
                elif num < ord('A'):
                        num += 26
            elif symbol.islower():
                if num > ord('z'):
                    num -= 26
                elif num < ord('a'):
                    num += 26
            translated += chr(num)
        else:
            translated += symbol
    return translated
mode = getMode()
message = getMessage()
key = getKey()
print('Your translated text is:')
print(getTranslatedMessage(mode, message, key))