Oh, that’s fair. I don’t think we should update Mapping or MutableMapping. People who want this for their own class can override __or__ and __ror__.

On Wed, Dec 4, 2019 at 11:19 Serhiy Storchaka <storchaka@gmail.com> wrote:
04.12.19 20:18, Guido van Rossum пише:
> On Tue, Dec 3, 2019 at 2:10 AM Serhiy Storchaka
> <storchaka@gmail.com
> <mailto:storchaka@gmail.com>> wrote:
>
>     And the same question for |. Should `{} | Mapping()` and `{} | []` work?
>
>
> Ditto -- {} | Mapping() should work, but {} | [] should not.

set() | Set() falls back to Set.__ror__. collection.abc.Set.__ror__ is
defined, but you suggested to not define it for collection.abc.Mapping.
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