Arjuna reacted to Tido in [ASK] how to install Python in armbian
I don't have reference, but if you do in a terminal:
dpkg -l python3.*
you can see what version you have installed by looking for the 'ii'.
As @martinayotte, already wrote 2.x and 3.x is usually already installed. Depending on your 'project' the installed version is already sufficent for your needs and you can start programming :-)