Procedure
Install JupyterLab or Notebook
Install JupyterLab and/or classic Notebook via pip (or conda/Homebrew) in a Python environment, ensure the jupyter CLI is on PATH, then verify with jupyter lab --version or jupyter notebook --version.
Step 1
In a Python 3 venv or conda env, install per https://jupyter.org/install : pip install jupyterlab for JupyterLab and/or pip install notebook for classic Notebook. Alternatives: conda install -c conda-forge jupyterlab ; macOS brew install jupyterlab . If you used pip install --user, add the user Scripts/bin dir to PATH.
Step 2
Open a new terminal in the same environment. Optional smoke test: jupyter lab (or jupyter notebook) and confirm the browser UI opens.
Step 3
jupyter lab --version 2>/dev/null || jupyter notebook --version
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