Asyncio event loop

Asyncio is Python's standard asynchronous I/O framework.

Basic coroutine

import asyncio

async def worker():
    await asyncio.sleep(1)
    print("done")

asyncio.run(worker())

Task groups

async with asyncio.TaskGroup() as tg:
    tg.create_task(job1())
    tg.create_task(job2())

Cancellation handling

Always catch CancelledError in long running background workers.