pyodide

Pyodide Javascript package

Usage

Download and extract Pyodide packages from Github releases (pyodide-build-*.tar.bz2). The version of the release need to match exactly the version of this package.

Then you can load Pyodide in Node.js as follows,

let pyodide_pkg = await import('pyodide/pyodide.js');

let pyodide = await pyodide_pkg.loadPyodide({ indexURL: "<pyodide artifacts folder>" });

await pyodide.runPythonAsync('1+1')

Note: To start node REPL with support for top level await, use node --experimental-repl-await.

See the documentation fore more details.

Details

The Javascript code in this package is responsible for the following tasks:

1. Defines the public Javascript API
   • Package loading code to allow loading of other Python packages.
   • Can load micropip to bootstrap loading of pure Python wheels
2. Loads the CPython interpreter and the core/pyodide emscripten application which embeds the interpreter.
3. Injects the js/pyodide Javascript API into sys.modules. This is the final runtime dependency for core/pyodide & py/pyodide, so after this step the interpreter is fully up and running.