如何在凯撒密码中保持标点符号不变？ - Python

Question

我在加密或解密消息时无法尝试保持标点符号不变

# encryption
message = input("Enter a message to be encrypted: ") # user inputs message to be encrypted
offset = int(input ("Enter an offset: ")) # user inputs offset
print ("\t")

encrypt = " " 

for char in message:
    if char == " ":
        encrypt = encrypt + char
    elif char.isupper():
        encrypt = encrypt + chr((ord(char) + offset - 65) % 26 + 65) # for uppercase Z
    else:
        encrypt = encrypt + chr((ord(char) + offset - 97) % 26 + 97) # for lowercase z

print ("Your original message:",message)
print ("Your encrypted message:",encrypt)
print ("\t")

如果我尝试使用标点符号（偏移量为 8）加密消息，输出的示例：

Your original message: Mr. and Mrs. Dursley, of number four Privet Drive, were proud to say that they were perfectly normal, thank you very much.
Your encrypted message:  Uzj ivl Uzaj Lczatmgh wn vcujmz nwcz Xzqdmb Lzqdmh emzm xzwcl bw aig bpib bpmg emzm xmznmkbtg vwzuith bpivs gwc dmzg uckp

我怀疑这个程序正在将标点符号更改为字母，因为 chr(ord(char)) 函数。

有什么方法可以在不过多更改代码的情况下将实际标点符号添加到加密消息中？非常感谢任何帮助，谢谢！

Answer 1

通过使用 isalpha()

处理第一个条件中的所有非字母字符，只需更改一个衬里即可获得所需的结果

# encryption
message = input("Enter a message to be encrypted: ") # user inputs message to be encrypted
offset = int(input ("Enter an offset: ")) # user inputs offset
print ("\t")

encrypt = " " 

for char in message:
    if not char.isalpha(): #changed
        encrypt = encrypt + char
    elif char.isupper():
        encrypt = encrypt + chr((ord(char) + offset - 65) % 26 + 65) # for uppercase Z
    else:
        encrypt = encrypt + chr((ord(char) + offset - 97) % 26 + 97) # for lowercase z

print ("Your original message:",message)
print ("Your encrypted message:",encrypt)
print ("\t")

Answer 2

与使用 space 相同，您可以使用任何字符。

if char in string.punctuation+' ':
        encrypt = encrypt + char

如何在凯撒密码中保持标点符号不变？ - Python

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