Hello all,
I am trying the TaskGroup class in the python 3.11 beta version. And I like it
a lot. It makes asynchronous programming intuitive enough even for the less
experienced like myself. I can see myself teaching this to my colleges when
they run linux parallel subprocesses. I will try to convince our IT department
to download 3.11 when it’s officially out mostly because of new improved
asyncio support. The speed gain will be another good justification.
However, excuse my ignorance, I have a question...
Why can’t I use TaskGroup.create_task method (or asyncio.create_task function)
with a Future object (eg. output of loop.run_in_executor function) since it’s
an awaitable (i.e., I can do “await future”)? In other words, why can’t
create_task accept all awaitable objects?
I can wrap the loop.run_in_executor in an async function and call that function
inside create_task with no issues.
It would be nice to do the following:
async def func(num: int) -> int:
await asyncio.sleep(5)
return num
def blocking_function(*args: float) -> float:
time.sleep(5)
sum(args)
async def func() -> tuple[int, float]:
loop = asyncio.get_event_loop()
args = (1, 2, 3)
async with asyncio.TaskGroup() as tg:
task1 = tg.create_task(func(5))
task2 = tg.create_task(loop.run_in_executor(None, blocking_function,
*args))
results = await task1, await task2
return results
Also, is there a way I can put a timeout for the task group so I can handle it
using except* TimeOutError?
Also, if I handled/extracted the exception, can I uncancel some of the tasks
(that were canceled due to the exception handling) that already took long time
so I can resume it in another GroupTask?
Thanks,
Abdulla
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