Qfyilyi

I have inspected this SO question on how to gracefully close out the asyncio process. Although, when I perform it on my code:

async def ob_main(product_id: str, freq: int) -> None:

    assert freq >= 1, f'The minimum frequency is 1s. Adjust your value: {freq}.'



    save_loc = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'data', 'ob', product_id)



    while True:

        close = False

        try:

            full_save_path = create_save_location(save_loc)

            file = open(full_save_path, 'a', encoding='utf-8')

            await ob_collector(product_id, file)

            await asyncio.sleep(freq)

        except KeyboardInterrupt:

            close = True

            task.cancel()

            loop.run_forever()

            task.exception()

        except:

            exc_type, exc_value, exc_traceback = sys.exc_info()

            error_msg = repr(traceback.format_exception(exc_type, exc_value, exc_traceback))

            print(error_msg)

            logger.warning(f'[1]-Error encountered collecting ob data: {error_msg}')

        finally:

            if close:

                loop.close()

                cwow()

                exit(0)

I get the following traceback printed in terminal:

^C['Traceback (most recent call last):n', ' File "/anaconda3/lib/python3.7/asyncio/runners.py", line 43, in runn return loop.run_until_complete(main)n', ' File "/anaconda3/lib/python3.7/asyncio/base_events.py", line 555, in run_until_completen self.run_forever()n', ' File "/anaconda3/lib/python3.7/asyncio/base_events.py", line 523, in run_forevern self._run_once()n', ' File "/anaconda3/lib/python3.7/asyncio/base_events.py", line 1722, in _run_oncen event_list = self._selector.select(timeout)n', ' File "/anaconda3/lib/python3.7/selectors.py", line 558, in selectn kev_list = self._selector.control(None, max_ev, timeout)n', 'KeyboardInterruptn', 'nDuring handling of the above exception, another exception occurred:nn', 'Traceback (most recent call last):n', ' File "coinbase-collector.py", line 98, in ob_mainn await asyncio.sleep(freq)n', ' File "/anaconda3/lib/python3.7/asyncio/tasks.py", line 564, in sleepn return await futuren', 'concurrent.futures._base.CancelledErrorn']

and the code keeps running.

task and loop are the variables from the global scope, defined in the __main__:


loop = asyncio.get_event_loop()
task = asyncio.run(ob_main(args.p, 10))


Applying this question's method solves the issue. So in the above case:

try:

    loop.run_until_complete(ob_main(args.p, 10))

except KeyboardInterrupt:

    cwow()

    exit(0)

However, I do not uderstand why that works.