Antoine's example works because list inherits from object. The more general rule "compatible layout" only allows the rarest of cases to work -- basically the two classes involved must have a common base class and one of the classes must not add any C-level fields to that base class's layout. I would never count on this except in cases where this possibility is documented (e.g. when one class is designed to be a mix-in for the other).
On Mon, Apr 28, 2014 at 11:24 AM, Antoine Pitrou <solip...@pitrou.net>wrote: > On Mon, 28 Apr 2014 20:45:48 +0300 > Paul Sokolovsky <pmis...@gmail.com> wrote: > > > > So, is that it, or disjoint native types are supported as bases > > somehow? Also, would someone know if a class-subclass case happens for > > example in stdlib? > > Well, for instance this trivial example works: > > >>> class C(list, object): pass > ... > >>> > > Basically, if two classes have compatible layouts, you can inherit from > both at once. > > Regards > > Antoine. > > > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/guido%40python.org > -- --Guido van Rossum (python.org/~guido)
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