[issue20566] asyncio as_completed() thrashes adding and removing callbacks

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6e04027ed53e by Guido van Rossum in branch 'default':
asyncio: Change as_completed() to use a Queue, to avoid O(N**2) behavior. Fixes issue #20566.
http://hg.python.org/cpython/rev/6e04027ed53e

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nosy: +python-dev

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