diy2.py

import random
message = "洛伊,周末一起去看动画展" 
key="国防部对面罕见病噶麻烦"
key_message = ""
for i in message:
    str1 = i
    str2 = random.choice(key)
    str3 = random.choice(key)
    text = str1 + str2 + str3
    key_message = key_message + text
print(key_message)