diy4.py

import random
key = "abcdefgh使用编程实现位移替换加密，制作密码机关真是太好玩了哈哈！"
message = "诺依，周末一起去看动漫展吧！"
key_message="" 
noise = "port:@#$%^&"
for i in message:
    str1 = i
    str2 = random.choice(key)
    str3 = random.choice(key)
    text = str1+str2+str3
    key_message = key_message + text

list_message = list(key_message)  
index = random.randint(0, len(key_message))
list_message.insert(index,noise)
result_message = "".join(list_message)  
print(result_message)