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 [email protected] 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-change-the-world/
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