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+# The Python Data Model
+
+Sample code for Chapter 1 of _Fluent Python 2e_ by Luciano Ramalho (O'Reilly, 2020)
+
+## Running the tests
+
+### Doctests
+
+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
+
+### Jupyter Notebook
+
+Install ``pytest`` and the ``nbval`` plugin:
+
+    $ pip install pytest nbval
+
+Run:
+
+    $ pytest --nbval