Okay, that's fair. So the argument really comes down to backwards
compatibility (which is inconvenient but important).
On Sat, May 2, 2020 at 1:51 PM Dominik Vilsmeier <dominik.vilsme...@gmx.de>
wrote:
> `frozenset` and `set` make a counterexample:
>
> >>> frozenset({1}) == {1}
> True
> On 02.05.20 22:36, Guido van Rossum wrote:
>
> 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 <alex.moj...@gmail.com> wrote:
>
>> On Sat, May 2, 2020 at 9:51 PM Serhiy Storchaka <storch...@gmail.com>
>> 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.
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>
>
> --
> --Guido van Rossum (python.org/~guido)
> *Pronouns: he/him **(why is my pronoun here?)*
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--
--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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