python3 needs to be installed.
python3 -m venv venv
source venv/bin/Actiavate
pip install -r requirements.txt
python main.py
import _tkinter # If this fails your Python may not be configured for Tk
^^^^^^^^^^^^^^^
ModuleNotFoundError: No module named '_tkinter'
MacOS originally has tkinter and python inside its system, but it has very complicated version problem. Hence I recommend to use brew or pyenv installed python and tkinter.
brew install python
brew install python-tk
would fix your problem.
If this problem continues you can use backup.py instead of main.py but nah rumps UI sucks