On Tue, Apr 20, 2021 at 2:15 PM srku...@mail.de <srku...@mail.de> wrote: > > So, forgive me my relatively simple mental model about ExceptionGroup. I > still try to create one for daily use. > > As noted in the discussion, an EG provides a way to collect exceptions from > different sources and raise them as a bundle. They have no apparent relation > up until this point in time (for whatever reason they have been separate and > for whatever reason they are bundled now). The result would be a tree graph > in any case. > > A usual datastructure for a tree is to store all child nodes at the parent > node. > > That was the idea behind the content of BaseException.__group__: it’s the > list of child exceptions bundled at a specific point in time and raise as > such a bundle. So all exceptions could become EGs with the additional > semantics you‘ve described in the PEP. > > Illustrative Example: > >>> bundle_exc.__group__ > [IOError(123), RuntimerError(‘issue somewhere’)] > > I was wondering what of the PEP could be removed to make it simpler and more > acceptable/less confusing (also looking at reactions from Twitter etc.) and I > found these additional classes to be a part of it. Additionally, I fail to > see how to access these bundled exceptions in an easy manner like __cause__ > and __context__. (As the PEP also referring to them). So, I removed the > classes and added a regular attribute.
This seems more confusing to me too. Instead of having a single ExceptionGroup class, you're suggesting that all exceptions should effectively become ExceptionGroups. I know what ExceptionGroup([ValueError]) means -- it means there was a ValueError, and it got put in a group, so it should probably be handled the same way as a ValueError. I have no idea what a KeyError([ValueError]) would mean. Is that a KeyError or a ValueError? Adding flexibility doesn't necessarily make things simpler :-) -n -- Nathaniel J. Smith -- https://vorpus.org _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/F6LVP7CLQGIAZ2PI2SL6FN3VXF2MVY2M/ Code of Conduct: http://python.org/psf/codeofconduct/
