Quoth Aahz:
[...]
> This is another reason why new-style classes can't be accepted yet:
> there's no reliable way to tell the distinction between class and
> instance.
isinstance(x, type)?
--
Steven Taschuk "The world will end if you get this wrong."
staschuk at telusplanet.net -- "Typesetting Mathematics -- User's Guide",
Brian Kernighan and Lorrinda Cherry