Python Testing with pytest, Second Edition: CH2 exercises local package install

In the exercises Brian poses the question “what happens if you change compare=False to compare=True.

well, the answer is nothing. As I have found out that you need to add a -e flag to the “pip install ./cards_proj/” command to allow editing of the source code, otherwise, literally nothing will happen if you change it.

Is this an error in the book or did Brian mean for us to learn this info?