On Wed, 1 Jul 2020 at 03:37, Random832 <random...@fastmail.com> wrote:
> On Tue, Jun 30, 2020, at 10:57, Guido van Rossum wrote: > > 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. > > > > > > Anyway, maybe there is a reason it is not a given. Any thoughts? > > One thing that may be worth considering is that tuples and lists with the > same respective contents are not equal to each other [whereas sets and > frozensets are] > > I do think it might be worthwhile to have a "compare two sequences" [and > possibly also "hash a sequence", to match the tuple hash without making a > tuple] building block as a function somewhere, so people could relatively > easily make their own [perhaps even something like "__eq__ = > collections.sequence_eq"] > Maybe something like collections.mixins.ComparableSequence ? a bundle class with "__eq__", "__ne__", "__le__" -behaving like they do for lists? Then, " collections.mixins.HashableSequence" would also be a natural fit. If that is interesting enough, maybe more such mixins can be thought of to be added there? One thing that I've missed sometimes - and is complicated to implement - is to have the Sequences generated by collections.abc... to behave properly with slices - collections.mixins.SlicedSequence that would override `__delitem__`, `__setitem__` and `__getitem__` and handle slices could pair up with the "ComparableSequence" - people could use these "a la carte", and no backwards compatibility would be hurt. _______________________________________________ > 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/L2L7FVQFHTMSOU6BE6VGFWKTIORIBPNO/ > Code of Conduct: http://python.org/psf/codeofconduct/ >
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