On Fri, Sep 27, 2019 at 5:21 PM Guido van Rossum <gu...@python.org> wrote:
> On Fri, Sep 27, 2019 at 11:18 AM Serhiy Storchaka <storch...@gmail.com> > wrote: > >> I think it needs an explicit support in the type creation machinery (as >> __slots__ itself has) to support descriptors and slots with the same name. >> > > That would be tough, since __slots__ is currently implemented by creating > a separate descriptor for each slot. > > I do think that it would be nice to have a way to automatically create > __slots__ from annotations. It would be even nicer if that could be done > without copying the class object (as the current state of the art requires: > https://github.com/ericvsmith/dataclasses/blob/master/dataclass_tools.py#L23 > ). > > Thinking aloud, perhaps this could be done by setting __slots__ to a > magical value, e.g. > > class Point: > __slots__ = "__auto__" > x: float > y: float > > This would be independent from the @dataclass decorator (though the > decorator may have to be aware of the magic value). > > If that's too wacky, we could also use a class keyword argument: > > class Point(slots=True): > x: float > y: float > > (Though arguably that's just as wacky. :-) > An argument is less wacky than assigning a magic value to a magic dunder. -gps
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