JupyterLab

4.5.6 · active · verified Sat Mar 28

JupyterLab is an open-source, web-based interactive development environment for notebooks, code, and data, serving as the next-generation user interface for Project Jupyter. It consolidates familiar tools like notebooks, terminals, text editors, and file browsers into a flexible and extensible interface. Currently at version 4.5.6, it is actively maintained with frequent minor and patch releases, and significant major version updates less often.

Warnings

breaking JupyterLab 3.x extensions are generally incompatible with JupyterLab 4.x due to significant type and API changes. JupyterLab 3 reached end of maintenance on May 15, 2024, with critical fixes until December 31, 2024. Upgrade extensions and ensure compatibility when migrating to JupyterLab 4.
Fix: Upgrade to JupyterLab 4.x and migrate or find updated versions of any installed extensions. Consult the 'Extension Migration Guide' in the official documentation.
gotcha If 'jupyter' command is not found after `pip install --user jupyterlab`, it's likely due to the user-level bin directory not being in your PATH environment variable.
Fix: Add `export PATH="$HOME/.local/bin:$PATH"` to your shell profile (e.g., `.bashrc`, `.zshrc`) on Unix-like systems, or execute `~/.local/bin/jupyter lab` directly.
gotcha Avoid running `jupyter lab` from your root volume (e.g., `C:\` on Windows or `/` on Linux) to minimize the risk of inadvertently modifying system files.
Fix: Navigate to a specific project directory or your user home directory before launching JupyterLab: `cd ~/my_projects && jupyter lab`.
deprecated For Jupyter Notebook versions older than 5.3, enabling the JupyterLab server extension required running `jupyter serverextension enable --py jupyterlab --sys-prefix`. This step is no longer necessary for modern JupyterLab installations.
Fix: Ensure your Jupyter Notebook installation is up-to-date. For current versions of JupyterLab, this command is not needed.
deprecated Older 'source extensions' for JupyterLab, which required Node.js and a full JupyterLab rebuild upon installation, are deprecated. Modern prebuilt extensions are distributed as Python packages and can be installed with `pip` or `conda` without a rebuild.
Fix: When developing or installing extensions, prioritize those distributed as Python packages (prebuilt extensions) compatible with JupyterLab 4+.
gotcha Real-time collaboration (RTC) in JupyterLab 4 has been moved into a separate package, `jupyter_collaboration`. It's no longer built-in.
Fix: If real-time collaboration is needed, install the dedicated package: `pip install jupyter_collaboration`.

Install

pip install jupyterlab Install latest stable version

Imports

JupyterServerApp
```
from jupyter_server.serverapp import JupyterServerApp
```
JupyterLab is primarily a command-line application ('jupyter lab'). Programmatic interaction with its underlying server components often involves `jupyter_server`.

Quickstart

Launch JupyterLab in your default web browser. It will typically open at `http://localhost:8888/lab`.

jupyter lab

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