agronholm/anyio

Health v2 · maintenance only

Adoption not part of the score

2556 stars · 303 forks observed · 2026-10-11

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

AnyIO is a high-level asynchronous concurrency and networking library for Python that runs on top of either asyncio or Trio. It provides Trio-style structured concurrency, task groups, async networking primitives, and a pytest plugin, letting code run unmodified on either async backend.

Use cases

• write async python code that works on both asyncio and trio
• structured concurrency with task groups in asyncio
• async tcp and udp socket networking
• run async tests with pytest and async fixtures
• async file io and subprocess handling
• migrate a library from asyncio to trio incrementally

When to choose

• you need backend-agnostic async code portable across asyncio and trio
• you want trio-like structured concurrency on asyncio
• you need high-level async networking, streams, and synchronization primitives
• you want async pytest testing with hypothesis support

When to avoid

• you only target one backend and are happy with its native APIs
• you need a full web framework rather than a concurrency library
• you work outside the Python ecosystem

Facets

library · maturity stable

concurrency networking testing http-server developer-tools backend networking apis python cross-platform asyncio trio structured-concurrency async-await task-groups pytest-plugin

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