import asyncio

class MyException(Exception):
    pass

async def async_fn():
    await asyncio.sleep(0)
    raise MyException

async def main():
    task = asyncio.current_task()

    try:
        async with asyncio.TaskGroup() as tg:
            tg.create_task(async_fn())
            try:
                await asyncio.sleep(1)
            except asyncio.CancelledError:
                pass
    except* MyException:
        print("done!")

    print(f"{task.cancelling()=} should be 0")

asyncio.run(main())