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Showing content from https://mail.python.org/pipermail/python-dev/2009-February/086124.html below:

[Python-Dev] Small misleadingness in docs

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Terry Reedy wrote:

> The new (in 3.0 and maybe 2.6, but undocumented) special methods 
> __instancecheck__ and __subclasscheck__ let one overload the default 
> behavior of isinstance and issubclass.

That's fine for 3.0, but I don't think the current behaviour
should be removed from any 2.x version, as it would make
writing code that works over multiple 2.x versions difficult.

-- 
Greg

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