isinstance() and multiple inheritance/ctypes

[Steven D'Aprano]

On Thu, 27 Aug 2015 09:14 am, Chris Angelico wrote:

> On Thu, Aug 27, 2015 at 9:12 AM, Chris Angelico <rosuav at gmail.com> wrote:
>> Or is there a magic __isinstance__
> 
> Argh, keyed the wrong thing and sent the post prematurely. Meant to say:
> 
> Or is there a magic __instancecheck__ method somewhere that I'm not aware
> of?

Yes -- see Terry Reedy's post. 

isinstance(inst, klass) ends up calling 

type(klass).__instancecheck__(klass, inst)



-- 
Steven