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https://github.com/python-websockets/websockets

Library for building WebSocket servers and clients in Python
https://github.com/python-websockets/websockets

python python3 websocket websocket-client websocket-library websocket-server websockets

Last synced: 8 days ago
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Library for building WebSocket servers and clients in Python

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README 

          
.. image:: logo/horizontal.svg

   :width: 480px

   :alt: websockets



|licence| |version| |pyversions| |tests| |docs| |openssf|



.. |licence| image:: https://img.shields.io/pypi/l/websockets.svg

    :target: https://pypi.python.org/pypi/websockets



.. |version| image:: https://img.shields.io/pypi/v/websockets.svg

    :target: https://pypi.python.org/pypi/websockets



.. |pyversions| image:: https://img.shields.io/pypi/pyversions/websockets.svg

    :target: https://pypi.python.org/pypi/websockets



.. |tests| image:: https://img.shields.io/github/checks-status/python-websockets/websockets/main?label=tests

   :target: https://github.com/python-websockets/websockets/actions/workflows/tests.yml



.. |docs| image:: https://img.shields.io/readthedocs/websockets.svg

   :target: https://websockets.readthedocs.io/



.. |openssf| image:: https://bestpractices.coreinfrastructure.org/projects/6475/badge

   :target: https://bestpractices.coreinfrastructure.org/projects/6475



What is ``websockets``?

-----------------------



websockets is a library for building WebSocket_ servers and clients in Python

with a focus on correctness, simplicity, robustness, and performance.



.. _WebSocket: https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API



Built on top of ``asyncio``, Python's standard asynchronous I/O framework, the

default implementation provides an elegant coroutine-based API.



An implementation on top of ``threading`` and a Sans-I/O implementation are also

available.



`Documentation is available on Read the Docs. `_



.. copy-pasted because GitHub doesn't support the include directive



Here's an echo server with the ``asyncio`` API:



.. code:: python



    #!/usr/bin/env python



    import asyncio

    from websockets.asyncio.server import serve



    async def echo(websocket):

        async for message in websocket:

            await websocket.send(message)



    async def main():

        async with serve(echo, "localhost", 8765) as server:

            await server.serve_forever()



    asyncio.run(main())



Here's how a client sends and receives messages with the ``threading`` API:



.. code:: python



    #!/usr/bin/env python



    from websockets.sync.client import connect



    def hello():

        with connect("ws://localhost:8765") as websocket:

            websocket.send("Hello world!")

            message = websocket.recv()

            print(f"Received: {message}")



    hello()



Does that look good?



`Get started with the tutorial! `_



.. raw:: html



    


    

    
websockets for enterprise


    
Available as part of the Tidelift Subscription


    
The maintainers of websockets and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use. Learn more.


    


    
(If you contribute to websockets and would like to become an official support provider, let me know.)



Why should I use ``websockets``?

--------------------------------



The development of ``websockets`` is shaped by four principles:



1. **Correctness**: ``websockets`` is heavily tested for compliance with

   :rfc:`6455`. Continuous integration fails under 100% branch coverage.



2. **Simplicity**: all you need to understand is ``msg = await ws.recv()`` and

   ``await ws.send(msg)``. ``websockets`` takes care of managing connections

   so you can focus on your application.



3. **Robustness**: ``websockets`` is built for production. For example, it was

   the only library to `handle backpressure correctly`_ before the issue

   became widely known in the Python community.



4. **Performance**: memory usage is optimized and configurable. A C extension

   accelerates expensive operations. It's pre-compiled for Linux, macOS and

   Windows and packaged in the wheel format for each system and Python version.



Documentation is a first class concern in the project. Head over to `Read the

Docs`_ and see for yourself.



.. _Read the Docs: https://websockets.readthedocs.io/

.. _handle backpressure correctly: https://vorpus.org/blog/some-thoughts-on-asynchronous-api-design-in-a-post-asyncawait-world/#websocket-servers



Why shouldn't I use ``websockets``?

-----------------------------------



* If you prefer callbacks over coroutines: ``websockets`` was created to

  provide the best coroutine-based API to manage WebSocket connections in

  Python. Pick another library for a callback-based API.



* If you're looking for a mixed HTTP / WebSocket library: ``websockets`` aims

  at being an excellent implementation of :rfc:`6455`: The WebSocket Protocol

  and :rfc:`7692`: Compression Extensions for WebSocket. Its support for HTTP

  is minimal — just enough for an HTTP health check.



  If you want to do both in the same server, look at HTTP + WebSocket servers

  that build on top of ``websockets`` to support WebSocket connections, like

  uvicorn_ or Sanic_.



.. _uvicorn: https://www.uvicorn.org/

.. _Sanic: https://sanic.dev/en/



What else?

----------



Bug reports, patches and suggestions are welcome!



To report a security vulnerability, please use the `Tidelift security

contact`_. Tidelift will coordinate the fix and disclosure.



.. _Tidelift security contact: https://tidelift.com/security



For anything else, please open an issue_ or send a `pull request`_.



.. _issue: https://github.com/python-websockets/websockets/issues/new

.. _pull request: https://github.com/python-websockets/websockets/compare/



Participants must uphold the `Contributor Covenant code of conduct`_.



.. _Contributor Covenant code of conduct: https://github.com/python-websockets/websockets/blob/main/CODE_OF_CONDUCT.md



``websockets`` is released under the `BSD license`_.



.. _BSD license: https://github.com/python-websockets/websockets/blob/main/LICENSE