[issue29302] add contextlib.AsyncExitStack

[Vedran Čačić]

Vedran Čačić added the comment:

An example from "real life": I recently needed this when implementing a demo of dining philosophers using asyncio (when the order of locks should depend on comparison of fork ids, not be static). Of course, it wasn't hard to implement it directly, but still, it would be nice if I had it in stdlib.

Also, yes, it would probably be nicer if there was only one ExitStack with push_async and similar methods.

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nosy: +veky

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<http://bugs.python.org/issue29302>
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