Well will only develop our Python training courses using Python3. Python2 is now deprecated and no longer in development. There are significant differences between the two. If you are using a Raspberry Pi for your code development, Python will already be installed. You can start an interactive - Python REPL (response, evaluate, print, loop) session by entering python3 at a terminal command prompt. (We will show a way to modify a file in your starting or home folder at a later time. It is just a convenience and not a necessary requirement.)
Python has been the default programming language for Raspberry Pi's since the early days back in 2012. It is an excellent first programming language for beginners to learn.