Typed TaskGroup.start_soon

[ThirVondukr]

Would it be possible to provide asyncio-like interface to TaskGroup.start_soon?:

tg.start_soon(coro(a=a, b=b))

Instead of

tg.start_soon(coro, a, b)

If that's not possible due to trio API maybe it should at least be typed using ParamSpec? 🤔

[agronholm]

1. Trio does not support this
2. This would not work with TaskGroup.start() anyway

[smurfix]

That's not a good idea because, frankly, the asyncio way is broken. For instance, if coro has a non-async wrapper (debugging, change the floating-point context, …) the wrapper doesn't run in the new task's context. Oops.

If you want to call a coro with keyword parameters, functools.partial is your friend.

[ThirVondukr]

Shouldn't you create your own wrapper for functools.partial since it's not typed? 🤔 Also it's not about keyword parameters but typing/type safety in general

[davidbrochart]

Maybe worth looking at: https://github.com/tiangolo/asyncer

[agronholm]

You can often also use a lambda too (but be careful about its side effects).

[ThirVondukr]

Thanks for quick replies, I think making a wrapper is the easiest way to avoid any issues with typing here