python编写移位密码实现加密与解密
移位密码

参考代码，通过列表和ASCII实现：

def encrypt(s,key):l = list(s);l1 = list();for i in l:if i.isalpha():k = (ord(i) - 97 + key) % 26 +97;l1.append(chr(k));else:l1.append(i);s1 = ''.join(l1)print('encrypted: ' ,s1);def decrypt(s,key):l = list(s);l1 = list();for i in l:if i.isalpha(): #确保输入内容为字母k = (ord(i) - 97 - key) % 26 +97;l1.append(chr(k));else:l1.append(i);s1 = ''.join(l1)print('decrypted: ',s1);s = input("please enter content: ")
key = input("please enter the secret key : ")#秘钥（0-25）
s1 = input("encryption 1 , decryption 2 : ")
select = int(s1);
key1 = int(key);
if select == 1:encrypt(s,key1)
else:decrypt(s,key1);

加密后的结果：

解密后的结果：