Behavior of Python `threading.Thread` when using `daemon=True`

threading_daemon_true.py

from threading import Thread
from time import sleep


def target_f():
    while True:
        print("start")
        sleep(10)
        print(
            "You'll never see this message because the main function will exit before"
        )


# IMPORTANT! Setting `daemon` to `True` allows us to stop the thread
# abruptly. If not it will run forever!
t = Thread(target=target_f, args=(), daemon=True)


def main():
    while True:
        t.start()
        print("good night")
        sleep(3)
        print("good bye")
        exit()


main()