Vigenere Cipher 用于带有空格的句子

Question

我想为句子制作一个 vigenere 密码程序。 例如消息是“介绍我最好的朋友卡莉”，关键字是“攀登”

y = "Introducing my best friend carly"
target_length = len(y)

def repeat_string(a_string, target_length):
    number_of_repeats = target_length // len(a_string) + 1
    a_string_repeated = a_string * number_of_repeats
    a_string_repeated_to_target = a_string_repeated[:target_length]
    return a_string_repeated_to_target

a_string = "climb"

print (y)
print(repeat_string(a_string, target_length))

输出是

Introducing my friend carly
climbclimbclimbclimbclimbcl

而我想要的输出是

Introducing my friend carly
climbclimbc li mbclim bclim

怎么做？

Answer 1

一种方法是使用 itertools 并遍历原始消息：

import itertools
y = "Introducing my best friend carly"
target_length = len(y)
a_string = "climb"


def repeat_string(a_string,y):
    repeated_word = itertools.cycle(a_string)
    return "".join([next(repeated_word) if letter.isalpha() else letter for letter in y])



print (y)
print(repeat_string(a_string,y))

输出：

Introducing my best friend carly
climbclimbc li mbcl imbcli mbcli

编辑：这应该保留任何标点符号， 输入：

y = "Introducing, my best friend carly.

输出：

Introducing, my best friend carly.
climbclimbc, li mbcl imbcli mbcli.