On Wed, Mar 31, 2021 at 2:14 PM Brandt Bucher <brandtbuc...@gmail.com> wrote:
> (One change from my last email: it doesn't allow `__match_map__` / > `__match_seq__` to be set to `False`... only `True`. This prevents some > otherwise tricky multiple-inheritance edge-cases present in both of our > flagging systems that I discovered during testing. I don't think there are > actual use-cases for unsetting the flags in subclasses, but we can revisit > that later if needed.) > That's surprising to me. Just like we can have a class that inherits from int but isn't hashable, and make that explicit by setting `__hash__ = None`, why couldn't I have a class that inherits from something else that happens to inherit from Sequence, and say "but I don't want it to match like a sequence" by adding `__match_sequence__ = False`? AFAIK all Mark's versions would support this by setting `__match_kind__ = 0`. Maybe you can show an example edge case where this would be undesirable? -- --Guido van Rossum (python.org/~guido) *Pronouns: he/him **(why is my pronoun here?)* <http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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