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

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

Remaining TODO list:

- Add a test showing the need for the .uncancel() call in __aexit__()
  (currently on line 97). Dropping that line does not cause any tests
  to fail.
- Ensure the taskgroup tests are run with the C and Python Task
  implementations.
- Rename tests to have meaningful names.
- I have a few ideas for minor cleanups that I will do later.
- Documentation and What's New entry (in a separate PR, probably).
- Update the docs in a few places to de-prioritize asyncio.gather()
  and steer people towards TaskGroups.

(We could also add something like Trio's cancel scopes, e.g. based on
Andrew Svetlov's async-timeout, which has a mature API.
But that should be a separate bpo issue.)

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<https://bugs.python.org/issue46752>
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