The top of Page 26 refers to ch2/tasks+proj/tests/unit/test_task.py
Closer to the bottom of Page 26 “Install tasks either by running pip install . or pip install -e . from the tasks_proj directory”
Since the top of Page 26 refers to the ch2 director, I went to ch2/tasks_proj to do the pip install, which resulted in error. After a while, I figured out that I needed to be in the tasks_proj that is on the same level as all of the chX directories.
I think the book could make this a bit more clear, to avoid confusion