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Wed Apr 30 16:30:29 CEST 2014 · https://mail.python.org/pipermail/python-dev/2014-April/134425.html

It would be a disaster if the base class's slot descriptors would be broken
by that though, so the implementation of slot descriptors would have to
become more complicated. (It's worth understanding how __slots__ works. the
interpreter first finds the slot on the class and then calls its __get__
method to retrieve the actual value from the instance. Each slot
descriptor, in the current implementation, knows the offset of its slot
within the instance.

On Tue, Apr 29, 2014 at 11:48 PM, Greg Ewing <greg.ewing at canterbury.ac.nz>wrote:

> Paul Sokolovsky wrote:
>
>  Well, here it itches to ask if C++-like offsetting of subclass to base
>> class "this" pointer was considered,
>>
>
> I suppose in theory it would be possible to build a new
> set of __slot__ descriptors for the subclass. It mightn't
> even be all that difficult. My guess would be that it
> wasn't considered worth the effort, if it was considered
> at all.
>
> --
> Greg
>
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-- 
--Guido van Rossum (python.org/~guido)
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[Python-Dev] Multiple inheritance from builtin (C) types [still] supported in Python3?