Apologies I'm not a core dev so this might be the wrong place to ask but I
have 2 small clarifying questions about the PEP.
Firstly, if I have a library which supports multiple versions of Python and
I need to catch all standard exceptions, what is considered the best
practise after this PEP is introduced?
Currently I might have code like this right now:
try:
... # Code
except Exception as e:
... # Logic to handle exception
Reading through the PEP, particularly on backwards compatibility it looks
like I would now need to do this:
try:
ExceptionGroup
except NameError:
standard_exceptions = Exception
else:
standard_exceptions = (Exception, ExceptionGroup)
try:
... # Code
except standard_exceptions as e:
... # Logic to handle exception
Secondly, once I only support versions of Python that support Exception
groups, what replaces the best practise for generally catching standard
exceptions? Is it this:
try:
... # Code
except *Exception as e:
... # Logic to handle exception
Thanks,
Damian (He/Him)
On Mon, Feb 22, 2021 at 7:48 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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