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。
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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 lista
def 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 lista
a = int(raw_input("input 0 to encrypt and 1 to unencrypt"))
if a == 0:
encrypt()
elif a == 1:
unencrypt()
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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服务器之家。
原文链接：https://blog.csdn.net/St_laurence/article/details/83352951