The mixins are part of the contract. You are free to override them, their implementation is just a helpful,default.
FWIW I don’t think we should add a .get() method for Sequence or for list. It reeks of hyper-correctness. On Wed, Aug 26, 2020 at 01:33 Alex Hall <alex.moj...@gmail.com> wrote: > On Wed, Aug 26, 2020 at 1:47 AM Greg Ewing <greg.ew...@canterbury.ac.nz> > wrote: > >> As a point of interest, is get() considered an official part of the >> >> >> mapping protocol, or just nice-to-have? >> >> >> >> >> >> The docs don't seem to be very clear about that. There used to be >> >> >> some tables listing the methods making up the core sequence and >> >> >> mapping protocols, but I can't find them now. Have they been removed? >> >> >> Are the ABCs now the definitions of the protocols? >> > > I would also like to see an official answer to this. Are the mixin > methods of the ABCs considered part of their contract? Is it documented > somewhere? I think it should be. > > On the one hand it sort of feels like the contract is just the abstract > methods that users are supposed to implement themselves, and the mixin > methods are just a convenient benefit of subclassing. It's hard to say > where that feeling comes from, but I think the name "mixin method" is part > of it. I'm glad to see I'm not the only one that gets this feeling. > > On the other hand, if I have a variable of type Mapping, I'm usually going > to assume it has a .get method that behaves like dict. Most tools will > assume that too. If it doesn't, I'll be quite surprised and probably > annoyed. > > > > > _______________________________________________ > > 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/UCJXMBLFIFLTB7ITAW6UQHW6JBMZKHDP/ > > Code of Conduct: http://python.org/psf/codeofconduct/ > > -- --Guido (mobile)
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