On Fri, Jan 21, 2022 at 6:57 AM Chris Angelico <ros...@gmail.com> wrote:
> On Fri, 21 Jan 2022 at 22:52, Ricky Teachey <ri...@teachey.org> wrote:
> >
> > 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
> >
>
> Let's be fair here... The idea of freezing is to make it hashable, so
> there's no point talking about freezing a function, module, or
> datetime, since they are already hashable. Don't saddle the proposal
> with issues it doesn't have :)
>
> (Technically this applies to an re.Match object too, actually,
> although I had to check to be sure. I've never once wanted to use one
> as a dict key. In contrast, I most certainly *have* used functions as
> dict keys, and it's safe and dependable.)
>
> ChrisA
>
Great point! I learned something.
---
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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