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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