本文实例为大家分享了python实现移位加密和解密的具体代码，供大家参考，具体内容如下

代码很简单，就不多做解释啦。主要思路是将字符串转为Ascii码，将大小写字母分别移位密钥表示的位数，然后转回字符串。需要注意的是，当秘钥大于26的时候，我使用循环将其不断减去26，直到密钥等效小于26为止。

def encrypt(): temp = raw_input("Please input your sentence: ") key = int(raw_input("Please input your key: ")) listA = map(ord,temp) lens = len(listA) for i in range(lens): a = listA[i] if 65 <= a <= 90: a += key while a > 90: a -= 26 elif 97 <= a <= 122: a += key while a > 122: a -= 26 listA[i] = a listA = map(chr,listA) listA = ''.join(listA) print listAdef unencrypt(): temp = raw_input("Please input your sentence: ") key = int(raw_input("Please input your key: ")) listA = map(ord, temp) lens = len(listA) for i in range(lens): a = listA[i] if 65 <= a <= 90: a -= key while a < 65: a += 26 elif 97 <= a <= 122: a -= key while a < 97: a += 26 listA[i] = a listA = map(chr, listA) listA = ''.join(listA) print listAa = int(raw_input("input 0 to encrypt and 1 to unencrypt"))if a == 0: encrypt()elif a == 1: unencrypt()

效果

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。