python3 exit program in threading loop join code example

Example: python3 exit program in threading loop join

import random
import signal
import threading
import time

exit_event = threading.Event()


def bg_thread():
    for i in range(1, 30):
        print(f'{i} of 30 iterations...')
        time.sleep(random.random())  # do some work...

        if exit_event.is_set():
            break

    print(f'{i} iterations completed before exiting.')


def signal_handler(signum, frame):
    exit_event.set()


signal.signal(signal.SIGINT, signal_handler)
th = threading.Thread(target=bg_thread)
th.start()
th.join()