Sorry for my imprecision, can you read the changes about the results:
--
With one coroutine in `asyncio.gather([sub_task()])`, result is:
main_task(), be: CancelledError()
__main__ <class 'KeyboardInterrupt'>
With two coroutines `asyncio.gather([sub_task(), asyncio.sleep(0)])` , result
is:
main_task(), be: KeyboardInterrupt()
__main__ <class 'KeyboardInterrupt'>
--
Yves Duprat wrote:
> Thank you for the straightforward explanation. May I ask you another question?
> I don't understand the behavior of this waiting primitive. So here is the
> case below:
> ```py
> import asyncio
> e = KeyboardInterrupt # or SystemExit
> async def sub_task():
> raise e
> async def main_task():
> try:
> await asyncio.gather(
> # -- aws --
> sub_task(),
> asyncio.sleep(0)
> )
> except Exception as e:
> print('\tmain_task(), e:', repr(e))
> raise
> except BaseException as e:
> print('\tmain_task(), be:', repr(e))
> if __name__ == '__main__':
> try:
> asyncio.run(main_task())
> except e:
> print(f'__main__ {e}')
> ```
> When one coroutine `[sub_task()]`, result is:
> main_task(), be: CancelledError()
> __main__ <class 'KeyboardInterrupt'>
> When two coroutines `[sub_task(), sleep(0)]` , result is:
> main_task(), be: KeyboardInterrupt()
> __main__ <class 'KeyboardInterrupt'>
> Why are results so different when `aws` contains single coroutine or two
> coroutines ?
> Thank for your time
> Yves
> Guido van Rossum wrote:
> > KeyboardInterrupt is generally not handled properly by asyncio, the normal
> > behavior here is that the code just exits with a traceback.
> > On Tue, Jun 7, 2022 at 11:00 AM Yves Duprat ydup...@gmail.com wrote:
> > Hi,
> > regarding this [issue93122](https://github.com/python/cpython/issues/93122),
> > I am wondering what is the normal behavior of `asyncio.gather` when one of
> > the submitted tasks raises a `KeyboardInterrupt` exception ? -- regardless
> > of the value of the `return_exception` parameter.
> > It seems that this primitive does not behave the same way with
> > `KeyboardInterrupt` and `ZeroDivisionError` exceptions. But may be it is
> > normal ?
> > I have searched in the documentation [here](
> > https://docs.python.org/3/library/asyncio-task.html#asyncio.gather) but I
> > did not find anything.
> > Thanks for your help.
> > Yves
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> > --
> > --Guido van Rossum (python.org/~guido)
> > *Pronouns: he/him **(why is my pronoun here?)*
> > http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-c...
> >
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