Thanks, Mikael. You are correct in noticing I've been following some online courses, as well as reading some books, and have encountered differences in how Python runs on Pythonista.
The tutorials I have been following do use 3.6, mainly, and my goal is to learn python rather than run anything on iOS. I got Pythonista as a convenient way to practice coding rather than because it was related to iOS. Just as a way to tinker with code wherever I am.