The PyZX labs are provided as Jupyter notebook files. In order to run these, you will need to install the PyZX python package, as well as Jupyter if it is not already installed, with the following CLI command:
pip3 install pyzx jupyter
Then, you can download the lab attached to this post, and run jupyter with the CLI command:
jupyter notebook
Then, navigate to the downloaded notebook file and run it. If you reach the bonus material, you also need to auxiliary file `CCCNOT` which is attached. The labs are self-contained with all the instructions needed in the notebooks, but you might find it useful to consult the corresponding tutorials in tandem while you complete them.