How to background another process in Python?

[Kalet]

The thing is, I'm trying to get a process inside my script and have me call it whenever I want. For example, I'm filling in some data and I enter the word "background". In this way, it is called a process that is always active. I leave my code in python, I have created a decorator but I get the following error: "EOFError".

Besides that, it should work both ways, when I'm in the background and insert "background", it should return to the main function.

I share with you the code I've been doing:

#!/usr/bin/env python
# -*- coding: utf-8 -*-


import os, time

def daemonLife(func):
    def wrapper(*args, **kwargs):
        if os.fork(): return
        func(*args, **kwargs)
        os._exit(os.EX_OK)
    return wrapper

@daemonLife
def my_func():
   no_kill_nothing = "Hi!"
   print('pid of it: %d' % os.getppid())
   var2 = str(input("Inside of background!"))
   if var2 == "background":
      main(no_kill_nothing)

def main(text):
   if text == "background":
      my_func()

text = str(input("Insert something"))
main(text)

I tried multi-threading because I think it's more ideal but I haven't been able to.

Thank you very much!