diy4.py

import random
key="abcdefgh使用python实现简单的移位替换加密，制作密码机关真是太好玩了哈哈哈！"
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)