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 > > > > _______________________________________________ > > Python-ideas mailing list -- python-ideas@python.org > > To unsubscribe send an email to python-ideas-le...@python.org > > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/LBKATTNJT52FDFTGLYOB2JVFNZ64PLOL/ > > Code of Conduct: http://python.org/psf/codeofconduct/ > > -- --Guido (mobile)
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