Run atexit() when python process is killed

Question

I have a python process which runs in background, and I would like it to generate some output only when the script is terminated.

def handle_exit():
    print(\'         


        

Answer 1

To check your system and see which signal is being called:

import signal
import time


def handle_signal(sig_id, frame):
    sig = {x.value: x for x in signal.valid_signals()}.get(sig_id)
    print(f'{sig.name}, {sig_id=}, {frame=}')
    exit(-1)


for sig in signal.valid_signals():
    print(f'{sig.value}: signal.{sig.name},')
    signal.signal(sig, handle_signal)

time.sleep(30)

Answer 2

Try signal.signal. It allows to catch any system signal:

import signal

def handle_exit():
    print('\nAll files saved in ' + directory)
    generate_output()

atexit.register(handle_exit)
signal.signal(signal.SIGTERM, handle_exit)
signal.signal(signal.SIGINT, handle_exit)

Now you can kill {pid} and handle_exit will be executed.

Answer 3

To enable signals when debugging PyCharm on Windows:

1. Within PyCharm hit Ctrl + Shift + A to bring up the "Find Actions..." menu
2. Search for "Registry" and hit enter
3. Find the key kill.windows.processes.softly and enable it (you can start typing "kill" and it will search for the key)
4. Restart PyCharm