Async Python

10 pages in this section.

Why asyncio is concurrent but not parallel, how the event loop actually schedules coroutines, and how tasks, gather, TaskGroup, and sync/async bridging all follow from that one scheduling model.

Explainer Python Asyncio Event Loop

Asyncio Basics

The event loop, coroutines, and `await`.

Python Asyncio Basics Coroutines

Tasks & Gather

Scheduling concurrent work with `create_task` and `gather`.

Python Asyncio Tasks Gather

Structured Concurrency

Python Asyncio Taskgroup Structured Concurrency

Async HTTP with httpx/aiohttp

Concurrent requests, connection pools, and clients.

Python Asyncio Httpx Aiohttp

Async Context Managers & Iterators

`async with`, `async for`, and streaming.

Python Asyncio Async With Async For

Sync/Async Bridging

`run_in_executor`, `asyncio.to_thread`, and mixing worlds.

Python Asyncio Bridging Executor

Async Databases

`asyncpg`, SQLAlchemy async, and connection management.

Python Asyncio Database Asyncpg

Debugging Async Code

Python Asyncio Debugging Deadlocks

Async Best Practices

Where async helps (and where it hurts).

Python Asyncio Best Practices List

Async Python

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Async Python