diyf.py

import random
key="asdfghjklqwertyuiop1234567890zxcvbnm,zxcvbnm,./"
message="你个大sb."
key_message=" "
for i in message:
    str1=i
    str2=random.choice(key)
    str3=random.choice(key)
    test=str1+str2+str3
    key_message=key_message+test
print(key_message)

list1=list(key_message)
noise="poiyf$#@!%^&*()""
index=random.choice(0,len(key_message))
list1.insert(index,noise)
key_message1="".join(list1)
print(key_message1)