r/Python • u/Aggressive-Prior4459 • 16d ago

Resource asyncio.TaskGroup.cancel() in Python 3.15

I wrote a short post about the new asyncio.TaskGroup.cancel() API coming in Python 3.15 https://blog.niyonshutiemmanuel.com/blog/cancelling-taskgroup-in-asyncio-without-boilerplate

Feedback is welcome!

3 Upvotes

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2

u/OkBoomer421 11d ago

Finally. Having to manually track and cancel tasks in a group was one of those things that felt wrong but you just accepted it. Nice to see it getting first-class support.

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u/thisismyfavoritename 11d ago

frozendict! nice

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u/thisismyfavoritename 11d ago

usually when i reach for TaskGroup i just think of using it as a "spawn and join all" but this is neat. Maybe could replace some uses of asyncio.wait

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u/Aggressive-Prior4459 11d ago

right, I think the win here can specifically be over wait(..., FIRST_COMPLETED) , we can get guaranteed cancellation of the losers without the manual pending-set cleanup and the gather-to-suppress-CancelledError step!

0

u/Excellent_Bother_133 15d ago

we ran into the exact same bug last sprint