[Python-3000] ABC PEP isinstance issue Was: PEP 31XX: A Type Hierarchy for Numbers (and other algebraic entities)

[Guido van Rossum]

On 4/28/07, Jean-Paul Calderone <exarkun at divmod.com> wrote:
> Aside from the way in which `x' can already lie:
>
>     >>> class X(object):
>     ...     __class__ = property(lambda self: int)
>     ...
>     >>> isinstance(X(), int)
>     True
>     >>>
>
> Is this behavior changed/going to be changed in Py3k?

I'm not particularly enamored with it, but I believe it once served a
purpose for Zope. Does anyone know if it is still needed?

-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)