It does look like that would violate a basic property of `==` -- if two
values compare equal, they should be equally usable as dict keys. I can't
think of any counterexamples.
On Sat, May 2, 2020 at 1:33 PM Alex Hall
On Sat, May 2, 2020 at 9:51 PM Serhiy Storchaka
wrote: 02.05.20 21:34, Ahmed Amr пише:
I see there are ways to compare them item-wise, I'm suggesting to bake that functionality inside the core implementation of such indexed structures. Also those solutions are direct with tuples and lists, but it wouldn't be as direct with arrays-lists/tuples comparisons for example.
If make `(1, 2, 3) == [1, 2, 3]` we would need to make `hash((1, 2, 3)) == hash([1, 2, 3])`.
Would we? Is the contract `x == y => hash(x) == hash(y)` still required if hash(y) is an error? What situation involving dicts could lead to a bug if `(1, 2, 3) == [1, 2, 3]` but `hash((1, 2, 3))` is defined and `hash([1, 2, 3])` isn't?
The closest example I can think of is that you might think you can do `{(1, 2, 3): 4}[[1, 2, 3]]`, but once you get `TypeError: unhashable type: 'list'` it'd be easy to fix. _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-leave@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/BMSP5B... Code of Conduct: http://python.org/psf/codeofconduct/
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