Create a ctrl-c catching killbox, that will "arm" on first SIGINT and kill the process on second.

sigint_killbox.py

import itertools
import signal
import sys
import time
from threading import Timer


class Killbox:
    def __init__(self, timeout=5):
        self.timeout = timeout
        self.armed = False

    def _start_timer(self):
        self.timer = Timer(self.timeout, self.disarm)
        self.timer.start()

    def arm(self):
        self.armed = True
        self._start_timer()
        print("Killbox armed. Press CTRL+C again within {} seconds to terminate.".format(self.timeout))

    def disarm(self):
        self.armed = False
        print("Killbox disarmed. Press CTRL+C again to arm.")

    def handle_sigint(self, signum, frame):
        if self.armed:
            print("Killbox triggered. Exiting immediately.")
            self.timer.cancel()
            sys.exit(1)
        else:
            self.arm()


killbox = Killbox()

# Attach the SIGINT handler
signal.signal(signal.SIGINT, killbox.handle_sigint)

# Dummy long-running process
print("Press CTRL+C to test.")
for num in itertools.count():
    try:
        print(num)
        time.sleep(1)
    except KeyboardInterrupt:
        # Handle additional KeyboardInterrupt if necessary
        pass