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List:       python-ideas
Subject:    [Python-ideas] Re: [issue32683] isinstance is calling ob.__getattribute__ as a fallback instead of o
From:       Steven D'Aprano <steve () pearwood ! info>
Date:       2021-12-10 1:53:33
Message-ID: 20211210015333.GU21647 () ando ! pearwood ! info
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On Fri, Dec 10, 2021 at 12:03:15AM +0000, Gabriele N Tornetta wrote:

> class Side(object):
> def __getattribute__(self, name):
> ValueError(name)

You forgot to actually *raise* the exception. That will just instantiate 
the ValueError instance, and then immediately garbage collect it.

In any case, type() and isinsance() do not work the same way. type() 
does not inspect the `__class__` attribute.

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