[issue21421] ABCs for MappingViews should declare __slots__ so subclasses aren't forced to have __dict__/__weakref__

[Raymond Hettinger]

Raymond Hettinger added the comment:

I've applied the __slots__ patch.  Thank you for submitting it.

Am leaving the rest of the ABCs code as-is.  The current form may be a bit wordy but it is clean, fast, and easy to trace through a debugger.  The expanded forms were chosen for a reason.

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resolution:  -> fixed
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21421>
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