After reading through the PEP and skimming the code (but I didn't build
it), something I didn't see: What happens to a currently conforming except
check?
try:
async with trio.open_nursery() as nursery:
# Make two concurrent calls to child()
nursery.start_soon(child)
nursery.start_soon(child)
except ValueError:
pass
I've removed the * from the example: Say the interface was built for 3.7,
but the "trio" module has been upgraded to use ExceptionGroups which can't
fall back to a standalone exception.
Silently hand back the first exception, or the first matching exception?
Deprecation warning? Silently skip? Context-specific error? Run the default
error handler?
I think that deserves a statement in the PEP.
-Em
On Mon, Feb 22, 2021 at 4:48 PM Irit Katriel via Python-Dev <
python-dev@python.org> wrote:
>
> Hi all,
>
> We would like to request feedback on PEP 654 -- Exception Groups and
> except*.
>
> https://www.python.org/dev/peps/pep-0654/
>
> It proposes language extensions that allow programs to raise and handle
> multiple unrelated
> exceptions simultaneously, motivated by the needs of asyncio and other
> concurrency libraries,
> but with other use cases as well.
>
> * A new standard exception type, ExceptionGroup, to represent multiple
> exceptions with
> shared traceback.
> * Updates to the traceback printing code to display (possibly nested)
> ExceptionGroups.
> * A new syntax except* for handling ExceptionGroups.
>
> A reference implementation (unreviewed) can be found at:
> https://github.com/iritkatriel/cpython/pull/10
>
> Thank you for your help
>
> Kind regards
> Irit, Yury & Guido
>
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