Ship additional Pyodide wheels at build time

User-installable wheels can be included at extension build time. Wheel indices can be generated with the jupyter lite pip index CLI and then included in package.json#/piplite: make sure to include the index and .whl files in package.json#/files as well.

Adding wheels to the Pyodide kernel

The Pyodide kernel itself consists of a bit of JavaScript and customized python wheels, which in turn require other wheels and pre-built WASM modules and other JavaScript.

Extra wheels that can be installed via piplite in a running kernel can be added via the --piplite-wheels CLI flag or PipliteAddon/piplite_urls config value, or simply left in-place in lite_dir/pypi.

These will be:

• downloaded to the local cache

• copied into {output-dir}/pypi

• indexed into an all.json with data similar to the [PyPI Warehouse API]

• added to pipliteUrls in jupyter-lite.json

If a package is not found in one of these URLs, it will be sought on the main Python Package Index (PyPI). This behavior can be disabled via jupyter-lite.json:

"jupyter-config-data": {
  "litePluginSettings": {
    "@jupyterlite/pyodide-kernel-extension:kernel": {
      "disablePyPIFallback": true
    }
  }
}