PEP 646 (Variadic Generics) tracker

[srittau]

• mypy (Support for PEP 646 mypy#12280)
• pytype (Support PEP 646 - Variadic Generics google/pytype#1525)
• 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 (functools.partial should use PEP612 ParamSpec (depends on #8708) #8703)
• Various functions in the keyboard third-party stubs:

  • typeshed/stubs/keyboard/keyboard/mouse.pyi

    Lines 47 to 56 in 8a8db9c

    	def on_button(
    	callback: Callable[..., None],
    	args: _Ts = ...,
    	buttons: list[_MouseButton] | tuple[_MouseButton, ...] | _MouseButton = ...,
    	types: list[_MouseEventType] | tuple[_MouseEventType, ...] | _MouseEventType = ...,
    	) -> _Callback: ...
    	def on_click(callback: Callable[..., None], args: _Ts = ...) -> _Callback: ...
    	def on_double_click(callback: Callable[..., None], args: _Ts = ...) -> _Callback: ...
    	def on_right_click(callback: Callable[..., None], args: _Ts = ...) -> _Callback: ...
    	def on_middle_click(callback: Callable[..., None], args: _Ts = ...) -> _Callback: ...

  • typeshed/stubs/keyboard/keyboard/__init__.pyi

    Line 37 in 8a8db9c

    def call_later(fn: Callable[..., None], args: _Ts = ..., delay: float = ...) -> None: ...

  • typeshed/stubs/keyboard/keyboard/__init__.pyi

    Lines 58 to 65 in 8a8db9c

    	def add_hotkey(
    	hotkey: _ParseableHotkey,
    	callback: Callable[..., bool | None],
    	args: _Ts = ...,
    	suppress: bool = ...,
    	timeout: float = ...,
    	trigger_on_release: bool = ...,
    	) -> Callable[[], None]: ...

Note that we won't be able to use PEP 646 as it currently stands for builtins.map, builtins.zip or asyncio.gather: python/cpython#32103 (comment)

[srittau]

This is now used in several places.