A Python distribution for the browser and Node.js based on WebAssembly.



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

What is Pyodide?

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
extensions have also been ported for use with Pyodide. These include many
general-purpose packages such as regex, PyYAML, lxml 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

Getting Started

Pyodide offers three different ways to get started depending on your needs and
technical resources. These include:

- Use a hosted distribution of Pyodide: see the [Getting
  Started]( documentation.
- Download a version of Pyodide from the [releases
  page]( and serve it
  with a web server.
  - Build natively with make: primarily for Linux users who want to
    experiment or contribute back to the project.
    recommended for Windows and macOS users and for Linux users who prefer a
    Debian-based Docker image with the dependencies already installed.


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

Iodide is no longer maintained.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


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



Pyodide uses the [Mozilla Public License Version