What happens when main thread of a Python process crashes?

threads.py

# Adapted from https://realpython.com/intro-to-python-threading/

import logging
import threading
import time


def thread_function():
    logging.info("Starting")

    count = 1
    while True:
        time.sleep(1)
        logging.info(
            f"Current thread live?: {threading.current_thread().is_alive()}, "
            f"Main thread live?: {threading.main_thread().is_alive()}, "
            f"Count: {count}"
        )
        count = count + 1

        # Let thread_function crash.
        if count == 20:
            logging.info(f"Here I crash: {1/0}")            


if __name__ == "__main__":
    format = "%(asctime)s: %(threadName)s: %(message)s"
    logging.basicConfig(format=format, level=logging.INFO, datefmt="%H:%M:%S")

    logging.info("Before creating thread")
    t1 = threading.Thread(target=thread_function)
    logging.info("Before running thread")
    t1.start()

    # Do nothing for some seconds.
    time.sleep(2)

    # Main thread raises a ZeroDivisionError here, but the other
    # thread keeps running.
    logging.info(f"Here I crash: {1/0}")

    # This will never get logged because the main thread crashed.
    logging.info("All done")