Daniel Stutzbach <dan...@stutzbachenterprises.com> added the comment:

Are you sure the old-style classes don't support ABCs?

ABCTestCase.validate_isinstance in Lib/test/test_collection.py specifically 
tests that both new-style and old-style classes work, unless I'm reading it 
wrong.

(and those tests fail if I make ABCMeta.__instancecheck__ and 
ABCMeta.__subclasscheck__ always return False for old-style classes)

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue2521>
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