凯撒密码Python-附加功能 [英] Caesar Cipher Python - Additional Features

问题描述

所以目前，我的代码看起来像这样(感谢我撰写的另一篇文章)

So currently, my code looks like this (thanks to help in another post I made)

phrase = raw_input("Enter text to Cipher: ")
shift = int(raw_input("Please enter shift: "))
result = ("Encrypted text is: ")

for character in phrase: 
     #Loops through phrase and shows ascii numbers, example: hello is: 104,101,108,108,111
    x = ord(character)

     #adds a shift to each character so if shift is 1 'hello' becomes: ifmmp 105,102,109,109,112
    result += chr(x + shift)


print "\n",result,"\n"

问题是，如果我输入多个单词，例如:hello world，移位为1

The problem is, if I type in more than one word for example: hello world , with a shift of 1

输出为:ifmmp!xpsme

感叹号出现一个空格(根据移位而变化).我当时正在考虑做一个if语句来检测空格:

The exclamation mark shows up for a space (varies depending on shift). I was thinking of doing an if statement to detect spaces:

phrase = raw_input("Enter text to Cipher: ")
shift = int(raw_input("Please enter shift: "))
result = ("Encrypted text is: ")

for character in phrase: 
        #Loops through phrase and shows ascii numbers, example: hello is: 104,101,108,108,111
    x = ord(character)

    if x == ord(' '):
        print "\nfound a space space"

        #adds 1 to each character so 'hello' becomes: ifmmp 105,102,109,109,112
    result += chr(x + shift)


print "\n",result,"\n"

但是我不知道如何在结果变量中添加空格.另外，我在此线程中看到:使用python的凯撒密码，可以用一点帮助

But I don't know how to add the space into the result variable. Also, I saw in this thread: Caesar's Cipher using python, could use a little help

JeffB使用while循环处理ASCII表32为空格而127为DEL.他为什么使用96?我不明白.

That JeffB used a while loop for dealing with the ASCII table 32 being space and 127 being DEL. Why did he use 96? I don't understand.

while x < 32:
    x += 96

while x > 127:
    x -= 96

抱歉，这个问题很长.提前谢谢了！您的帮助对我来说是无价之宝.

Sorry this question is rather long. Many thanks in advance! Your help is invaluable to me.

推荐答案

您可以跳过空格:

for character in phrase:
    x = ord(character)

    if character == ' ':
        result += ' '
    else:
        result += chr(x + shift)

您的班次不会将输出限制为仅ASCII.如果要确保这一点，则应使用模运算符:

Your shift won't restrict the output to just ASCII. If you want to ensure that, you should use the modulo operator:

chr(32 + (x + shift) % (127 - 32))

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