Python - Terminate main thread from a child

main.py

import os
import signal
import threading
import time


def install_thread_exceptions_hook():
    old_run = threading.Thread.run

    def run(*args, **kwargs):
        try:
            old_run(*args, **kwargs)
        except Exception:
            os.kill(os.getpid(), signal.SIGUSR1)
            raise

    threading.Thread.run = run


class ExitCommand(Exception):
    pass


def signal_handler(signal, frame):
    raise ExitCommand()


def thread_job():
    for i in range(10):
        time.sleep(1)
        print(f'Child thread: {i}')

        if i == 2:
            raise RuntimeError('Exception in a child thread!')


def main():
    install_thread_exceptions_hook()
    signal.signal(signal.SIGUSR1, signal_handler)
    thread = threading.Thread(target=thread_job)
    thread.start()

    for t in range(20):
        time.sleep(1)
        print(f'Main thread: {t}')


if __name__ == '__main__':
    main()