pyodide/pyodide: Pyodide is a Python distribution for the browser and Node.js based on WebAssembly

Pyodide is a port of CPython to WebAssembly/Emscripten.

Pyodide makes it possible to install and run Python packages in the browser with micropip. Any pure Python package with a wheel available on PyPi is supported. Many packages with C, C++, and Rust extensions have also been ported for use with Pyodide. These include many general-purpose packages such as regex, PyYAML, and cryptography, and scientific Python packages including NumPy, pandas, SciPy, Matplotlib, and scikit-learn.

Pyodide comes with a robust Javascript ⟺ Python foreign function interface so that you can freely mix these two languages in your code with minimal friction. This includes full support for error handling, async/await, and much more.

When used inside a browser, Python has full access to the Web APIs.

Try Pyodide (no installation needed)

Try Pyodide in a REPL directly in your browser. For further information, see the documentation.

Getting Started

• If you wish to use a hosted distribution of Pyodide: see the Getting

• If you wish to host Pyodide yourself, you can download Pyodide from the releases

• If you wish to use Pyodide with a bundler, see the documentation on Working with

• If you are a Python package maintainer, see the documentation on building and testing Python

• If you want to add a package to the Pyodide distribution, see the documentation on adding

• If you wish to experiment or contribute back to the Pyodide runtime, see the documentation on

The Components of the Pyodide Project

The Pyodide project consists of the following components:

1. A build of CPython with a few patches (https://github.com/pyodide/pyodide/tree/main/cpython/)
2. A JS/Python foreign function interface

1. JavaScript code for creating and managing Pyodide interpreters

1. A choice of Emscripten platform, which consists of a version + ABI-sensitive

1. A toolchain for cross compiling

History

Pyodide was created in 2018 by Michael Droettboom at Mozilla as part of the Iodide project. Iodide is an experimental web-based notebook environment for literate scientific computing and communication.

Iodide is no longer maintained. If you want to use Pyodide in an interactive client-side notebook, see Pyodide notebook environments.

Contributing

Please view the contributing guide for tips on filing issues, making changes, and submitting pull requests. Pyodide is an independent and community-driven open-source project. The decision-making process is outlined in the Project governance.

Communication

• Blog: blog.pyodide.org
• Mailing list: mail.python.org/mailman3/lists/pyodide.python.org/
• Twitter: twitter.com/pyodide
• Stack Overflow: stackoverflow.com/questions/tagged/pyodide
• Discord: Pyodide Discord

Sponsors

For a full list of current and historical sponsors, please see the Funding section of our About page.

Pyodide also has a large number of small donors. If you’re interested in supporting Pyodide, check out our OpenCollective and GitHub Sponsors pages.

Special thanks

• BrowserStack: This project is tested with BrowserStack

License

Pyodide uses the Mozilla Public License Version 2.0.