You need python3 and also:
sudo apt install python3-gi python3-gi-cairo gir1.2-gtk-3.0
To run: python3 pom.py
python3 pom.py
To edit interface: open main.glade in Glade
main.glade
Useful resources:
https://python-gtk-3-tutorial.readthedocs.io/en/latest/index.html
https://pygobject.readthedocs.io/en/latest/guide/index.html