[issue46771] Add some form of cancel scopes

Yury Selivanov added the comment: Couple thoughts: I'm +1 for adding TaskGroup.cancel() method. I'd be -1 on abusing `Task.cancel()` to signal something with a nonce. Whatever problem we are trying to solve here, it should be solvable without resorting to hacks like this. It should be trivi

[issue46752] Introduce task groups to asyncio and change task cancellation semantics

Guido van Rossum added the comment: New changeset d85121660ea50bbe8fbd31797aa6e4afe0850388 by Guido van Rossum in branch 'main': bpo-46752: Slight improvements to TaskGroup API (GH-31398) https://github.com/python/cpython/commit/d85121660ea50bbe8fbd31797aa6e4afe0850388 -- _

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