On 2019-09-28 03:12, Eric V. Smith wrote:
On Sep 27, 2019, at 8:23 PM, Guido van Rossum <gu...@python.org> wrote:
On Fri, Sep 27, 2019 at 11:18 AM Serhiy Storchaka <storch...@gmail.com
<mailto: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
I think a sentinel like None or a new typing.use_annotations_for_slots
(need a better name, of course) would be better than a magic string,
especially since strings are iterable.
[snip]
I was also thinking about suggesting None, but I was wondering whether
that could be misleading because it reads like "no slots".
What about "..." instead? Would that read better?
class Point:
__slots__ = ....
x: float
y: float
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