diy3.py

import random
message = "诺依，周末一起去看动漫展吧！"
jiami=""
key="请使用索引的知识"
str1=str2=str3=""
for i in message:
    a=random.choice(key)
    s=random.choice(key)
    jiami=jiami+i+a+s
print(jiami)