The python version of energyplus python plugin

edit

I'm trying to learn how to use python plugin of energyplus. As you may know, energyplus comes with its own python package and standard libraries. I checked the python license in the installation folder of energyplus and it is version 2! (WHY IS THAT?)

I'm already using python version 3.7 in my system. If I want to use native libraries in my plugin code, It is recommended to point energyplus to the directory of the desired library (or copy them from my package to energyplus python package). Would it be a problem using different versions of python? If it is a problem, I would appreciate your advice...