On Fri, Nov 10, 2017 at 8:33 PM, Ivan Levkivskyi <levkivs...@gmail.com> wrote:
> On 10 November 2017 at 18:39, Koos Zevenhoven <k7ho...@gmail.com> wrote: > >> On Wed, Sep 27, 2017 at 12:28 PM, Ivan Levkivskyi <levkivs...@gmail.com> >> wrote: >> >>> >>> >> >>> After creating the class, >>> the original bases are saved in ``__orig_bases__`` (currently this is >>> also >>> done by the metaclass). >>> >>> >> Those are *still* bases, right, even if they are not in the mro? I'm >> not sure if this is a naming thing or something even more. >> > > The objects that have __subclass_base__ method (proposed to rename to > __mro_entry__) > are removed from __bases__ attributed of the newly created class. > Otherwise they may cause a metaclass conflict. > One can however still call them syntactic (or static?) bases. For example > this is how it is going to be used by typing: > > from typing import List > > class Tokens(List[int]): > ... > > assert Tokens.__bases__ == (list,) > Why is List[int] not allowed to be the base? Neither method-lookup performance nor the metaclass conflict issue seem to depend on whether List[int] is in __bases__. > > >> NOTE: These two method names are reserved for exclusive use by >>> the ``typing`` module and the generic types machinery, and any other use >>> is >>> strongly discouraged. >>> >> >> Given the situation, that may be a good thing. But will it really work? >> I think it is also strongly discouraged to invent your own dunder method >> names, but people still do it. >> > > Terry had a similar comment. I will "soften" this formulation in the next > revision of the PEP. > > Right, I assume you mean the one where he pointed out that implicitly turning the methods into staticmethods based on their names makes those names reserved words. -- Koos -- + Koos Zevenhoven + http://twitter.com/k7hoven +
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