New submission from Aaron Hall:
We have __slots__ with other ABC's, see http://bugs.python.org/issue11333 and
http://bugs.python.org/issue21421.
There are no downsides to having empty slots on a non-instantiable class, but
it does give the option of denying __dict__ creation for subclassers.
The possibility of breaking is for someone using __slots__ but relying on
__dict__ creation in a subclass - they will have to explicitly add "__dict__"
to __slots__. Since we have added __slots__ to other ABC's,
I will provide a PR soon on this. Diff should look like this (in Lib/abc.py):
class ABC(metaclass=ABCMeta):
"""Helper class that provides a standard way to create an ABC using
inheritance.
"""
- pass
+ __slots__ = ()
(I also want to add a test for this, and ensure other ABC's also have this if
they don't.)
----------
messages: 294389
nosy: Aaron Hall
priority: normal
severity: normal
status: open
title: Add __slots__ to ABC convenience class
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Python tracker <[email protected]>
<http://bugs.python.org/issue30463>
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