example.py

#!/usr/bin/env python3 -u

import signal


class Runner:

    def __init__(self):
        self.stop = False
        self.previous_handler = signal.signal(signal.SIGINT, self.cb_signal_handler)

        print('Ctrl+c to stop')

    def __delete__(self, instance):
        signal.signal(signal.SIGINT, self.previous_handler)

    def cb_signal_handler(self, *args, **kwargs):
        self.stop = True
        print('Stopping...')

    def run(self):
        i = 0

        while True:
            if self.stop:
                print('Execution stopped')
                break

            # print a . every so often to show progress
            if i % 100000 == 0:
                print('.', end='')

            i += 1


if __name__ == '__main__':
    runner = Runner()
    runner.run()