Deitel book "Python for Programmers"

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Please am learning Python with Deitel also and encountering same challenge as you did. I will apreciate you guide me how you were able eto run the below line of command successfully:

jupyter labextension install @jupyter-widgets/jupyterlab-manager
jupyter labextension install jupyter-matplotlib

Those install only works if you have installed and old JupyterLab 2 version.
If now do pip install jupyterlab it will now install version v3.6.3.
This is Installation pip install ipywidgets

So you most check what version you use jupyter lab --version or conda list
If jupyter lab is old 2.0,then need to follow this.

Just install the newest should work fine for the code in book,or can get in trouble with versioning in more places if use old stuff.