forward, but I think I see what the issue is. The script is python3, I have python 2.7.17. Anyone know how to resolve this? (Mint 19.) Is it possible/wise/sensible to upgrade with apt get or is that the way of foolishness?
I'd be really surprised if you don't have python3 installed on your system.
Just try typing python3 instead of python and see what happens.
I wouldn't touch system python. If you need a different version, use a tool like pyenv to install and manage "your" python version(s).