[Python-Dev] Issues with PEP 526 Variable Notation at the class level (original) (raw)

Antoine Pitrou solipsis at pitrou.net
Sun Dec 10 16:15:01 EST 2017

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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