On Fri, Jan 21, 2022 at 5:04 AM Steven D'Aprano <st...@pearwood.info> wrote:
> On Fri, Jan 21, 2022 at 11:18:27AM +1100, Cameron Simpson wrote:
>
> > Paired with a __freeze__ dunder method, this applies to any type, not
> > just sets. (Where appropriate of course.)
> >
> > So:
> >
> > |{1,2,3}| frozen set
> > |[1,2,3]| tuple!
> > |any-iterable| tuple!
> > |{1:2, 3:4}| frozen dict
>
> A frozen "any iterable" is not necessarily a tuple.
>
> For example, a frozen binary tree should probably keep the tree
> structure and methods; a frozen dict.keys() should be a frozen set; and
> its not clear what a frozen iterator should do. Should it run the
> iterator to exhaustion? Seems odd.
>
> What about non-collections? What's a frozen re.MatchObject?
>
>
> --
> Steve
>
lord have mercy, what a can of worms this could end up being!:
frozen iostream
frozen property
frozen function object
frozen module object
frozen iterator
frozen datetime
i mean, i could certainly imagine rational (maybe even useful...?) ideas
for ALL of these. can you imagine the endless discussion about what to do
with the shiny new frozen operator, for every object under the sun?
obviously it would to nothing by raise an error by default. but people
would be asking to freeze everything and there would be mountains of ideas
threads and it would never end.
i'm not saying that reason means we don't have such an operator, but it
seems to me this just shows the decision on PEP 315 was the right one. why
have such a general operator, that could conceivably- and will be endlessly
requested and argued- be expanded to apply MANY things that even though
YAGNI for nearly all of them, when the only REAL need is only for a
frozenset?
---
Ricky.
"I've never met a Kentucky man who wasn't either thinking about going home
or actually going home." - Happy Chandler
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