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Concurrency & performance

asyncio, threading, multiprocessing, and profiling-friendly performance patterns.

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Concurrency & performance medium

How to Cancel an asyncio Task with Graceful Cleanup in Python

Cancel a running asyncio task, handle the cancellation signal inside a worker coroutine to perform cleanup, then re-raise so the cancellation propagates correctly.

asyncio cancellation cleanup
Python 
import asyncio


async def worker(name: str, sleep: float) -> None:
    try:
        print(f"{name}: starting")
        await asyncio.sleep(sleep)
        print(f"{name}: completed")
    except asyncio.CancelledError:
        print(f"{name}: cancelled, cleaning up...")
        await asyncio.sleep(0.2)  # Simulate clea…
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