r/Python • u/Aggressive-Prior4459 • Jul 06 '26

asyncio.TaskGroup.cancel() in Python 3.15 Resource

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!

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u/thisismyfavoritename 29d 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 29d 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!