Yury Selivanov added the comment:

Guido, Ben, Stefan, Nick,

I want to re-open this issue.  I'm still not satisfied with the current state 
of things, mainly with the __instancecheck__ hack for Awaitable & Coroutine 
ABCs (as Ben initially suggested).

I think we should remove the __instancecheck__ from the ABCs, and resurrect 
inspect.isawaitable() function:

1. abc.Coroutine and abc.Awaitable will guarantee that objects that implement 
them have '__await__' and it's safe to access it (that means that they will 
fail for generator-based coroutines).

2. inspect.isgenerator() can be used along with inspect.isawaitable() to detect 
generator-based coroutines (generators with CO_ITERABLE_COROUTINE flag).

----------
resolution: fixed -> 
status: closed -> open

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24400>
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