AntsySeagull45 kudos on sorting it out 🙂
quick note, trains-agent will try to run the python version specified by the original Task. i.e. if you were running python3.7 it will first try to look for python 3.7 then if it is not there it will run the default python3. This allows a system with multiple python versions to run exactly the python version you had on your original machine. The fact that it was trying to run python2 is quite odd, one explanation I can think of is if the original experiment was run on python2.7...
The other explanation is it default to the python version that runs the trains-agent! So if you managed to run the trains-agent with python2 this will be the version it will default to.
You can always verify the default python version, when running the trains-agent, it print the configuration, and you should see something like:
agent.default_python = 3.6