[issue28777] Add asyncio.Queue __aiter__, __anext__ methods

[Matt Rasband]

Matt Rasband added the comment:

I attempted this myself, it seemed to have too many costs associated for the stdlib and is something easy enough to wrap myself when I need this functionality with explicit semantics on how to "stop" the queue (using an `object()` sentinel). My implementation is flawed as the sentinel is global, instead of per queue instance, if you decide to use this at all.

See https://github.com/python/asyncio/pull/445

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nosy: +Matt Rasband

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