[Python-Dev] Issues with PEP 526 Variable Notation at the class level

[Guido van Rossum]

OTOH daytaclass is a decorator for *better* metaclass compatibility.

On Dec 10, 2017 13:17, "Antoine Pitrou" <solipsis at pitrou.net> wrote:

> On Sun, 10 Dec 2017 20:47:45 +0100
> Antoine Pitrou <solipsis at pitrou.net> wrote:
>
> > Hi,
> >
> > On Sun, 10 Dec 2017 19:17:25 +0000
> > Tin Tvrtković <tinchester at gmail.com> wrote:
> > > Hello,
> > >
> > > I'm one of the attrs contributors, and the person who initially wrote
> the
> > > slots functionality there.
> > >
> > > We've given up on returning a new class always since this can conflict
> with
> > > certain metaclasses (have you noticed you can't make a slots attrs
> class
> > > inheriting from Generic[T]?) and with PEP 487. I think with PEP 487
> it's
> > > becoming especially evident class creation is not necessarily an
> idempotent
> > > operation.
> >
> > Hmm... I understand you may be restricted by backwards compatibility
> > here.  But dataclasses don't have that issue, so we could decide we're
> > incompatible with certain dataclasses from day 1.
>
> Sorry... make that "incompatible with certain metaclasses" ;-)
>
> Regards
>
> Antoine.
>
>
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