Python asyncio: the event loop secret nobody explains

Pubblicato il: 01 gennaio 1970
sul canale di: Maksym Shemet

Most Python devs use asyncio daily without knowing what the event loop actually does. Let's fix that.

Learn exactly how Python's asyncio event loop works — the ready queue, the waiting list, and why await is a yield, not a block. You'll see why async crushes threads for I/O-bound work, when it fails completely (CPU-bound tasks), and what asyncio.run() actually does under the hood. Worked example: the same two coroutines run sequentially in 3 seconds, then concurrently in 2 — same loop, different schedule.

⏱ TIMESTAMPS 00:00 Intro — why most devs misunderstand async 00:20 Async vs threads vs processes 01:00 The event loop: ready queue + waiting list 01:45 asyncio.run() under the hood 02:30 Sequential vs concurrent — same code, different schedule 03:15 When NOT to use async (CPU-bound work) 03:45 Takeaway

📚 RESOURCES Python asyncio docs — https://docs.python.org/3/library/asy... asyncio Event Loop reference — https://docs.python.org/3/library/asy... asyncio Coroutines and Tasks — https://docs.python.org/3/library/asy... Developing with asyncio (debug guide) — https://docs.python.org/3/library/asy... PEP 3156 — asyncio proposal — https://peps.python.org/pep-3156/ PEP 492 — async/await syntax — https://peps.python.org/pep-0492/

🏷 TAGS Python asyncio, event loop Python, asyncio explained, Python async tutorial, async await Python, Python concurrency, asyncio run, Python threading vs async, cooperative multitasking Python, asyncio create_task, Python event loop explained, Python async programming, asyncio deep dive, Python I/O bound, Python concurrency tutorial, asyncio tutorial, Python async for beginners

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