I recall a law from evolutionary biology that went something like “once a
feature is gone it won’t evolve a second time (in the same species)”. I
have no interest in restoring argument unpacking.

On Sun, Aug 30, 2020 at 05:20 Eric V. Smith <e...@trueblade.com> wrote:

> On 8/30/2020 7:25 AM, Steven D'Aprano wrote:
>
> > On Sun, Aug 30, 2020 at 09:56:28PM +1200, Greg Ewing wrote:
>
> >> A thought just occurred to me. If we hadn't got rid of tuple
>
> >> unpacking in argument lists, we would have been able to write
>
> >>
>
> >>      def __getitem__(self, (x, y, z), **kwds):
>
> >>          ...
>
> > Indeed.
>
> >
>
> > Now that Python is moving to a PEG parser, maybe we could consider tuple
>
> > unpacking parameters again?
>
>
>
> I was sad to see tuple arg unpacking go. But PEP 3113 doesn't mention
>
> parsability as a reason to remove it. And indeed, since it worked with
>
> the old parser, the PEG parser would presumably have no problem with it.
>
>
>
> PEP 3113 mentions introspection, which is why I grudgingly accept that
>
> it had to go. Maybe if someone solved that problem we could get them
>
> back. But that would be a major effort, separate from this proposal, and
>
> would of course require another PEP.
>
>
>
> Eric
>
>
>
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