[Python] How to fix "'jupyter' is not recognized as an internal or external command, operable...

I have installed Jupyter on Windows 10, Python 3.x via

$ pip install jupyter


The installation works fine, even though I did restart the terminal.

But trying to run

$ jupyter notebook


gives the following error

'jupyter' is not recognized as an internal or external command, operable program or batch file.


How and where do I find the executable for Jupyter?

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