jupyterlab-hybrid-kernels 0.2.0a0

Use in-browser and regular kernels in JupyterLab

jupyterlab-hybrid-kernels

Use in-browser (JupyterLite) and regular Jupyter kernels together in JupyterLab and Jupyter Notebook.

https://github.com/user-attachments/assets/a6028cce-e613-479c-b56f-d090810e7638

[!WARNING] This extension is in early development and should be considered experimental.

Requirements

• JupyterLab >= 4.4.0 or Jupyter Notebook >= 7.4.0

Install

To install the extension:

pip install jupyterlab-hybrid-kernels

Currently, you also need to install the latest releases of JupyterLab or Jupyter Notebook to use this extension:

pip install jupyterlab>=4.4.0 notebook>=7.4.0

By default, installing JupyterLab or Jupyter Notebook will also install ipykernel as the default kernel for Python.

For in-browser kernels, you will need to install one of the available JupyterLite kernels. For example, to install the Pyodide kernel:

pip install jupyterlite-pyodide-kernel

Usage

This extension lets you use in-browser kernels (like Pyodide) and regular Jupyter kernels together in JupyterLab and Jupyter Notebook.

[!NOTE] While regular Jupyter kernels can be used across tabs and persist after reloading the page, in-browser kernels are only available on the page or browser tab where they were started, and destroyed on page reload.

File system access from in-browser kernels

In-browser kernels like Pyodide (via jupyterlite-pyodide-kernel) can access the files shown in the JupyterLab file browser.

To enable this, you need to set additional HTTP headers when serving the JupyterLab instance, for example in a jupyter_server_config.py file:

c.ServerApp.tornado_settings = {
  "headers": {
    "Cross-Origin-Opener-Policy": "same-origin",
    "Cross-Origin-Embedder-Policy": "require-corp"
  }
}

Then start JupyterLab with:

jupyter lab --config jupyter_server_config.py

Uninstall

To remove the extension, execute:

pip uninstall jupyterlab-hybrid-kernels

Contributing

Development install

Note: You will need NodeJS to build the extension package.

The jlpm command is JupyterLab's pinned version of yarn that is installed with JupyterLab. You may use yarn or npm in lieu of jlpm below.

# Clone the repo to your local environment
# Change directory to the jupyterlab_hybrid_kernels directory
# Install package in development mode
pip install -e "."
# Link your development version of the extension with JupyterLab
jupyter labextension develop . --overwrite
# Rebuild extension Typescript source after making changes
jlpm build

You can watch the source directory and run JupyterLab at the same time in different terminals to watch for changes in the extension's source and automatically rebuild the extension.

# Watch the source directory in one terminal, automatically rebuilding when needed
jlpm watch
# Run JupyterLab in another terminal
jupyter lab

With the watch command running, every saved change will immediately be built locally and available in your running JupyterLab. Refresh JupyterLab to load the change in your browser (you may need to wait several seconds for the extension to be rebuilt).

By default, the jlpm build command generates the source maps for this extension to make it easier to debug using the browser dev tools. To also generate source maps for the JupyterLab core extensions, you can run the following command:

jupyter lab build --minimize=False

Development uninstall

pip uninstall jupyterlab_hybrid_kernels

In development mode, you will also need to remove the symlink created by jupyter labextension develop command. To find its location, you can run jupyter labextension list to figure out where the labextensions folder is located. Then you can remove the symlink named jupyterlab-hybrid-kernels within that folder.

Testing the extension

Integration tests

This extension uses Playwright for the integration tests (aka user level tests). More precisely, the JupyterLab helper Galata is used to handle testing the extension in JupyterLab.

More information are provided within the ui-tests README.

Packaging the extension

See RELEASE