python 多进程：父进程无法退出

Question

I want parent process exit, and child process can still run.
When i run code, parent process can not exit. I use return to exit parent process. And child process can still run.
Why did parent process not exit?

System: centos7
Python version: 3.6

import os
import time
from multiprocessing import Process


def run_process():
    count = 0
    while True:
        print('it is son', os.getpid())
        time.sleep(3)
        count += 1
        if count >= 10:
            return


def main():
    t = Process(target=run_process)
    t.start()
    print('it is father', os.getpid())
    return

if __name__ == '__main__':
    main()

Answer 1

I suppose this happens because multiprocessing registering atexit handler.

source1 - registering in util module

source2 - util module import

Probably you'd better use simple os.fork for your purposes.