Awesome asyncio

A carefully curated list of awesome Python asyncio frameworks, libraries, software and resources.

The Python asyncio module introduced to the standard library with Python 3.4 provides infrastructure for writing single-threaded concurrent code using coroutines, multiplexing I/O access over sockets and other resources, running network clients and servers, and other related primitives.

Asyncio is not really a brand-new technology however it appears to be very trending since a few years - especially in the Python community and with the release of Python 3.4 in March 2014. Thus, it's pretty hard to keep yourself up-to-date with the most awesome packages out there. Find some of those awesome packages here and if you are missing one we count on you to create an Issue or a Pull Request with your suggestion.

Contents

• Web Frameworks
• Message Queues
• Database Drivers
• Networking
• GraphQL
• Testing
• Alternative Loops
• Misc
• Writings
• Talks
• Alternatives to asyncio

Web Frameworks

Libraries to build web applications.

• aiohttp - Http client/server for asyncio (PEP-3156).
• sanic - Python 3.5+ web server that's written to go fast.
• Quart - An asyncio web microframework with the same API as Flask.
• Vibora - Performant web framework inspired by Flask.
• cirrina - Opinionated asynchronous web framework based on aiohttp.
• autobahn - WebSocket and WAMP supporting asyncio and Twisted, for clients and servers.
• websockets - A library for building WebSocket servers and clients in Python with a focus on correctness and simplicity.
• Tornado - Performant web framework and asynchronous networking library.
• Japronto! - Experimental http toolkit built on top of uvloop and picohttpparser.
• Starlette - A lightweight ASGI framework/toolkit for building high performance services.
• uvicorn - The lightning-fast ASGI server.
• FastAPI - A very high performance Python 3.6+ API framework based on type hints. Powered by Starlette and Pydantic.

Message Queues

Libraries to implement applications using message queues.

• aioamqp - AMQP implementation using asyncio.
• pyzmq - Python bindings for ZeroMQ.
• aiozmq - Alternative Asyncio integration with ZeroMQ.
• crossbar - Crossbar.io is a networking platform for distributed and microservice applications.
• asyncio-nats - Client for the NATS messaging system.
• aiokafka - Client for Apache Kafka.

Database Drivers

Libraries to connect to databases.

• asyncpg - Fast PostgreSQL Database Client Library for Python/asyncio.
• asyncpgsa - Asyncpg with sqlalchemy core support.
• aiopg - Library for accessing a PostgreSQL database.
• aiomysql - Library for accessing a MySQL database
• aioodbc - Library for accessing a ODBC databases.
• motor - The async Python driver for MongoDB.
• aioredis - aio-libs Redis client (PEP 3156).
• asyncio-redis - Redis client for Python asyncio (PEP 3156).
• aiocouchdb - CouchDB client built on top of aiohttp (asyncio).
• aioinflux - InfluxDB client built on top of aiohttp.
• aioes - Asyncio compatible driver for elasticsearch.
• peewee-async - ORM implementation based on peewee and aiopg.
• GINO - is a lightweight asynchronous Python ORM based on SQLAlchemy core, with asyncpg dialect.
• Tortoise ORM - native multi-backend ORM with Django-like API and easy relations management.
• Databases - Async database access for SQLAlchemy core, with support for PostgreSQL, MySQL, and SQLite.

Networking

Libraries to communicate in your network.

• AsyncSSH - Provides an asynchronous client and server implementation of the SSHv2 protocol.
• aiodns - Simple DNS resolver for asyncio
• httpx - asynchronous HTTP client for Python 3 with requests compatible API.

GraphQL

Libraries to build GraphQL servers.

• Ariadne - Schema-first Python library for implementing GraphQL servers.
• Tartiflette - Schema-first Python 3.6+ GraphQL engine built on top of libgraphqlparser.

Testing

Libraries to test asyncio based applications.

• aiomock - A python mock library that supports async methods.
• asynctest - Enhance the standard unittest package with features for testing. asyncio libraries
• pytest-asyncio - Pytest support for asyncio.
• aresponses - Asyncio http mocking. Similar to the responses library used for requests
• aioresponses - Helper for mock/fake web requests in Python aiohttp package.

Alternative Loops

Alternative asyncio loop implementations.

• uvloop - Ultra fast implementation of asyncio event loop on top of libuv.

Misc

Other awesome asyncio libraries.

• aiocache - Cache manager for different backends.
• aiofiles - File support for asyncio.
• aiodebug - A tiny library for monitoring and testing asyncio programs.
• aiorun - A run() function that handles all the usual boilerplate for startup and graceful shutdown.
• aioserial - A drop-in replacement of pySerial.
• aiozipkin - Distributed tracing instrumentation for asyncio with zipkin
• asgiref - Backend utils for ASGI to WSGI integration, includes sync_to_async and async_to_sync function wrappers.
• ruia - An async web scraping micro-framework based on asyncio.

Writings

Documentation, blog posts, and other awesome writing about asyncio.

• Official asyncio documentation - Asynchronous I/O, event loop, coroutines and tasks.
• Short well-written intro to asyncio - Generators, Coroutines, Native Coroutines and async/await.
• AsyncIO for the Working Python Developer - A gentle introduction to asynchronous programming from basic examples working up to URL fetching.
• Test limits of Python aiohttp - Making 1 million requests with python-aiohttp.
• ASGI (Asynchronous Server Gateway Interface) - A spiritual successor to WSGI, intended to provide a standard interface between async-capable Python web servers, frameworks, and applications.
• First Principles Introduction to Asyncio - A no-buzzword first principles introduction to the internal workings of asyncio.
• Developing and Testing an Asynchronous API with FastAPI and Pytest - This tutorial looks at how to develop and test an asynchronous API with FastAPI using Test-Driven Development (TDD).

Talks

Recordings of awesome talks about asyncio.

• Topics of Interest (Python Asyncio) | screencast | slides - PyCon Brasil 2015 keynote (David Beazley).
• Python Asynchronous I/O Walkthrough | blog post - 8-part code walkthrough (Philip Guo).
• Async/await in Python 3.5 and why it is awesome - EuroPython 2016 (Yury Selivanov).
• Fear and Awaiting in Async: A Savage Journey to the Heart of the Coroutine Dream | screencast - PyOhio 2016 keynote (David Beazley).
• Asynchronous Python for the Complete Beginner | slides - PyCon 2017 (Miguel Grinberg).

Alternatives to asyncio

Alternative approaches to async programming in Python, some of which attempt to support some compatibility with asyncio, others are not compatible at all.

• curio - The coroutine concurrency library.
  • Curio-Asyncio Bridge - basic curio -> asyncio coroutine bridge
• trio - Pythonic async I/O for humans and snake people.
  • trio-asyncio - re-implementation of the asyncio mainloop on top of Trio