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Python with the scientific stack, compiled to WebAssembly.

Pyodide may be used in any context where you want to run Python inside a web browser.

Pyodide brings the Python 3.8 runtime to the browser via WebAssembly, along with the Python scientific stack including NumPy, Pandas, Matplotlib, SciPy, and scikit-learn. The packages directory lists over 75 packages which are currently available. In addition it's possible to install pure Python wheels from PyPi.

Pyodide provides transparent conversion of objects between Javascript and Python. When used inside a browser, Python has full access to the Web APIs.

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

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 Pyodide from source
  • Build natively with make: primarily for Linux users who want to experiment or contribute back to the project.
  • Use a Docker image: 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 communication.

Iodide is no longer maintained.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

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.

Pyodide uses the Mozilla Public License Version 2.0.