python实现凯撒密码加解密

源代码

def CaesarEncode(PlainText,shif):    #加密
    TextList = []
    AsciiList = []
    ResultList = []
    shift = int(shif)
    for i in PlainText:
        TextList.append(i)
    for j in TextList:
        num = ord(j)
        AsciiList.append(num)
    for k in AsciiList:
        tmp = int(k)
        addnum = tmp + shift
        Str = chr(addnum)
        ResultList.append(Str)
    ResultStr = "".join(ResultList)
    return ResultStr

def CaesarDecode(CipherText,shif):     #解密
    NumList = []
    StrList = []
    shift = int(shif)
    for i in CipherText:
        Num = ord(i)
        NumList.append(Num)
    for d in NumList:
        j = int(d)
        if(j - shift < 97):
            num = j - shift + 26
            StrList.append(chr(num))
        else:
            if(j - shift > 123):
                num = j - shift - 26
                StrList.append(chr(num))
            else:
                num = j - shift
                StrList.append(chr(num))
            
    PlainText = "".join(StrList)
    return PlainText

其实还可以继续优化一下
就是在解密时将26种情况同时列出来
大家可以下去自己试试哦