See also the rejected PEP 351.
--
Eric
> On Jan 20, 2022, at 7:21 PM, Cameron Simpson <c...@cskk.id.au> wrote:
>
> Well, I've just waded through this discussion.
>
> This all feels to me like a special case of "wanting a constant for
> bytecode". What is we had a "freeze" operator, eg:
>
> |foo|
>
> which would produce a frozen version of foo. I'm liking the vertical
> bars myself, I think because it feels vaguely slightly analogous to
> "absolute value". So (assuming we can squeeze it into the expression
> syntax):
>
> |{1,2,3}|
>
> always makes a direct frozen set on the same basis that:
>
> x in {1,2,3}
>
> directly makes a frozenset by expression inspection. Then
>
> 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
>
> Ths saves us (a) inventing a special syntax for frozen sets and (b)
> gateways to freezing many things, starting with the obvious above, via
> the __freeze__ dunder method.
>
> This feels more general and less bikeshedable.
>
> My main question is: is the syntax unambiguous?
>
> Cheers,
> Cameron Simpson <c...@cskk.id.au>
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