[issue30782] Allow limiting the number of concurrent tasks in asyncio.as_completed

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

FWIW I've been using TaskGroups in EdgeDB codebase extensively: https://github.com/edgedb/edgedb/blob/master/edb/common/taskgroup.py (you can use the code, it's Apache 2)

The only thing that prevented us from merging them in 3.8 is that we need to formally define & implement ExceptionGroup (or MultiError) in CPython.  I'm going to work on an initial PEP for that this week.

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