Serhiy Storchaka added the comment:

What if abstract class contains not only abstract methods, but default 
implementation of some methods? Should the predicate test if tested class 
contain these methods?

For example, the Sequence ABC contains default implementation of __iter__. 
Should the predicate test that concrete sequence class implements __iter__?

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9731>
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