PEP 785: address comments and partially revise proposal #4568
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Thanks in particular to @.iritkatriel for great feedback on Discourse, and @.gpshead for discussions over lunch.
This update makes a moderate change to the proposed
BaseExceptionGroup.leaf_exceptions()method, to return a list of(exc, traceback)tuples rather than accepting a boolean flag to call.with_traceback()for the user, and to specify that each sub-exception must be processed only once (in rare cases where a group is not tree-structured).The larger change is to scrap my proposed
BaseException.preserve_context()method: since I'd only (but always) recommend using it in the specific case of re-raising part of the exception group rendered by anexcept*statement, I now propose that we make a small language change to 'do the right thing' there unconditionally.Discuss thread here.
📚 Documentation preview 📚: https://pep-previews--4568.org.readthedocs.build/