(For people who fail to find any mention of protocols in PEP 634, Protocols
(PEP 544) can be used (with the @runtime decorator) to override
isinstance(), and class patterns are defined to use isinstance() for the
class check.)
On Wed, Nov 18, 2020 at 11:50 AM Brett Cannon wrote:
>
>
> On Wed, No
On Wed, Nov 18, 2020 at 11:39 AM Brett Cannon wrote:
> My question about adding pattern matching later was more to comment on the
> fact that the languages that use "_" for a wildcard pattern did it from
> early on, not later on; it had nothing to do with the proposal proposing
> pattern matching
On Wed, Nov 18, 2020 at 1:25 AM Robin Becker wrote:
> Is there a bestiary of examples for the current pattern matching
> proposal(s)?
>
> It seems I don't have a good handle on how one matches simple tests like
> callability,
Doable using protocols.
> function signatures,
I don't think that
On Tue, Nov 17, 2020 at 10:16 PM Greg Ewing
wrote:
> On 18/11/20 4:36 pm, Larry Hastings wrote:
> >
> > But,
> > the thinking went, you'd never want to examine the last value from a
> > list generator, so it was more convenient if it behaved as if it had its
> > own scope.
>
> List comprehensions
On Tue, Nov 17, 2020 at 1:16 PM Tobias Kohn wrote:
> Hi Brett,
>
> Without having really looked at the history of all the languages we
> mention in the PEPs, I have a hunch that most of them had pattern matching
> from quite the beginning or an early stage on, indeed. That being said, I
> think
[sorry for the duplicate, meant to reply-all]
Thank you for this approach, I find it really helpful to put the
conversation in these terms (semantics and guiding principles).
This is not an answer to the proposal (which I've read and helps me
contextualize) but to your points below and how they a
Is there a bestiary of examples for the current pattern matching proposal(s)?
It seems I don't have a good handle on how one matches simple tests like callability, function signatures, possession of
specific attribute(s).etc.
Also will matching ever extend into the Typing universe?
--
Rob
