asyncio Asynchronous I/O


asyncio is a library to write concurrent code using the async/await syntax .

asyncio is used as a foundation for multiple Python asynchronous frameworks that provide high-performance network and web-servers, database connection libraries, distributed task queues, etc.

asyncio is often a perfect fit for IO-bound and high-level structured network code.

asyncio provides a set of high-level APIs to:

  • run Python coroutines concurrently and have full control over their execution;

  • perform network IO and IPC;

  • control subprocesses;

  • distribute tasks via queues;

  • synchronize concurrent code;

Additionally, there are low-level APIs for library and framework developers to:

  • create and manage event loops, which provide asynchronous APIs for networking, running subprocesses, handling OS signals, etc;

  • implement efficient protocols using transports;

  • bridge callback-based libraries and code with async/await syntax.

. _asyncio_high_level_api:

asyncio High-level APIs

Guides and Tutorials

Structured concurrency with anyio