I think the set operation of dict_keys accepts any iterable by accident.
There is an issue for it: https://bugs.python.org/issue38538
On Wed, Dec 4, 2019 at 4:32 PM Serhiy Storchaka <storch...@gmail.com> wrote:
>
> 03.12.19 21:04, Andrew Barnert via Python-ideas пише:
> > On Dec 3, 2019, at 02:00, Serhiy Storchaka <storch...@gmail.com> wrote:
> >> What it will return if implement | for dicts? It should be mentioned in
> >> the PEP. It should be tested with a preliminary implementation what
> >> behavior is possible and more natural.
> >
> > What is there to document or test here? There’s no dicts involved in either
> > operator, only a set and a key view, both of which are set types and
> > implement set union.
>
> Oh, sorry, it was a wrong example. Here is the right one:
>
> >>> {(1, 2): 3}.keys() | {4: 5}
> {(1, 2), 4}
>
>
>
> >>> {4: 5} | {(1, 2): 3}.keys()
> {(1, 2), 4}
>
>
>
>
> How the results will change after implementing PEP 584? It all should be
> considered in the PEP. Note that dictkeys.__or__ does not return
> NotImplemented (there is an issue for this), so the PEP can require more
> wider changes than just adding __or__, __ror__ and __ior__ to dict.
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Inada Naoki <songofaca...@gmail.com>
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