Create a virtual environment as in:
python3 -m venv venv -- creates a directory called venv for a virtual python env
source venv/bin/activate -- activates virtual environment
python -m pip install -r requirements.txt -- installs python dependencies in venv
deactivate -- exit the virtual env
The virtual environment can be removed at any time using rm -rf venv
The eval_portus.py (used below) script operates in the virtual environment using a shebang #!venv/bin/python3