I don't recall why this was done. It seems somewhat odd, since Set and Mapping in the same module do have __eq__. I don't care much for the default implementation though.
(I don't understand why you would want to inherit from both Sequence and Set -- and certainly the resulting mongrel type would have to behave weirdly in order to conform to user expectations for both of its parents, regardless of what you do for __le__.) Traditionally we've been very reluctant to add new methods to existing ABCs, because of the implications for classes everywhere that inherit from these. On Tue, Jun 30, 2020 at 5:16 AM Joao S. O. Bueno <jsbu...@python.org.br> wrote: > Is there any reason why collections.abc.[Sequence|MutableSequence] do > not have "__eq__" for free? > > I was writing some tests now and was caught by surprise there. > > (chcking the docs, if my custom MutbaleSequence also > inherits from "collections.abc.Set" I will have working "__eq__" - and > "__ne__", methods > but also weirdly behaved "__le__" and cousins as a side efffect - weird > enough > I think i will just hand-write the "__eq__") > > While theoretically adding "__eq__" and "__ne__" _could_ hab > backward compatibility issues, I think it is more probable it would > actually fix some undetected bugs i a couple projets, as the default > __eq__ is > an identity comparison (is). > > Anyway, maybe there is a reason it is not a given. Any thoughts? > > > _______________________________________________ > Python-ideas mailing list -- python-ideas@python.org > To unsubscribe send an email to python-ideas-le...@python.org > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/BZTYVERLYDWPMW2QKSMDWXRRL3DUBSDC/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- --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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