Threading - close while loop

Question

I have a while loop:

while True:
    x = threading.Timer(3, something)
    x.start()
    # whatever
    x.cancel()

I want something to be a function or something to close the loop automatically if the timer runs out.

Answer 1

Since threading.Timer creates a thread, you could do something like this to generate a fake KeyboardInterrupt to interrupt the loop:

from time import sleep
import threading
import _thread as thread  # Low-level threading API


def something():
    thread.interrupt_main()  # Raises KeyboardInterrupt.

try:
    while True:
        print('loop iteration started')
        x = threading.Timer(3, something)
        x.start()
        sleep(4)
        x.cancel()
        print('loop iteration completed')
except KeyboardInterrupt:
    print('timeout occurred - loop closed')

print('-fini-')