Sample code for Chapter 1 of Fluent Python 2e by Luciano Ramalho (O'Reilly, 2020)

Use Python's standard doctest module to check stand-alone doctest file:

$ python3 -m doctest frenchdeck.doctest -v

And to check doctests embedded in a module:

$ python3 -m doctest vector2d.py -v

Install pytest and the nbval plugin:

$ pip install pytest nbval

Run:

$ pytest --nbval