PEP 646 (Variadic Generics) tracker

[srittau]

• [ ] mypy (https://github.com/python/mypy/issues/12280)
• [ ] pytype
• [x] pyright
• [ ] pyre
• [ ] PyCharm (nice to have, but not required)

[AlexWaygood]

I've ticked off pyright; I believe it's supported PEP 646 for a while now. I've also added a link to the nominal mypy issue, though there have been a fair few PRs over at mypy working on PEP 646 support and none of them seem to have referenced that issue ¯\_(ツ)_/¯.

[AlexWaygood]

PEP 646 lists Pyre as providing a reference implementation of the PEP, so they probably also have pretty good support.

[AlexWaygood]

PEP 646 support would be useful for (feel free to edit this):

• asyncio.events.Handle
• asyncio.events.TimerHandle
• asyncio.events.AbstractEventLoop.call_at
• asyncio.events.AbstractEventLoop.call_later
• asyncio.events.AbstractEventLoop.call_soon
• asyncio.base_events.BaseEventLoop.call_at
• asyncio.base_events.BaseEventLoop.call_later
• asyncio.base_events.BaseEventLoop.call_soon
• (Maybe): functools.partial (#8703)
• Various functions in the keyboard third-party stubs:
  • https://github.com/python/typeshed/blob/8a8db9c6d4e39b4c530b6b6ce03bb6869c394419/stubs/keyboard/keyboard/mouse.pyi#L47-L56
  • https://github.com/python/typeshed/blob/8a8db9c6d4e39b4c530b6b6ce03bb6869c394419/stubs/keyboard/keyboard/init.pyi#L37
  • https://github.com/python/typeshed/blob/8a8db9c6d4e39b4c530b6b6ce03bb6869c394419/stubs/keyboard/keyboard/init.pyi#L58-L65

Note that we won't be able to use PEP 646 as it currently stands for builtins.map, builtins.zip or asyncio.gather: https://github.com/python/cpython/pull/32103#discussion_r836917997

[srittau]

This is now used in several places.