Brett Cannon added the comment:
I brought this topic up on python-ideas and both Nick Coghlan and MA Lemburg
suggested the abc module like Yury did. So the proposal becomes to put
syntax-related ABCs into the abc module and domain-specific ones in their
respective stdlib modules.
Nick suggested the following ABCs get pulled out of collections.abc and put
into the abc module:
Callable - function calls
Iterable - for loops, comprehensions
Iterator - for loops, comprehensions
Generator - generators, generator expressions
Awaitable - await expressions
Coroutine - async def
AsyncIterable - async for
AsyncIterator - async for
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<http://bugs.python.org/issue25637>
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