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Wed Jun 28 02:41:08 CEST 2006 · https://mail.python.org/pipermail/python-dev/2006-June/066659.html

At 12:02 PM 6/28/2006 +1200, Greg Ewing wrote:
>Martin v. Löwis wrote:
>
> > Again, I believe this is all included for ExtensionClasses: it looks
> > for __class__ on the object if the type check fails, so that an
> > ExtensionClass could be actually a class derived from the C type.
>
>Now that we have had new-style classes for quite a
>while, is there still a need to support ExtensionClasses?

That's the wrong question.  The right question is, "is there a need to 
support isinstance() for proxy objects?" and the answer is yes.

As far as I know, nobody has proposed to change this behavior of 
isinstance(), nor even suggested a reason for doing so.

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[Python-Dev] Semantic of isinstance