I think it comes down to KISS: https://en.wikipedia.org/wiki/KISS_principle
To paraphrase Einstein...Pick the right tool, for the right job and makes things as simple simple as possible (but not simpler).
I've done a bit of python and had no need to touch the object oriented stuff yet. One of the main reasons I prefer C to C++ is that I just don't need OOP most of the time. If I can do without it, I don't need an extra level of abstraction getting in the way. On the other hand, I've had a project I started in C, but found that I really needed the OOP features of C++, so I shelved it until I'm in the mood for that.
Having gone on about all that, I can't recommend this site enough: http://learnpythonthehardway.org/book/
The problem with most tutorials is that they dumb the information down and leave out details and reasons why things are the way they are. That leads to 'copy/paste programming', where you just copy example code and arrange it in a way that does what you want. But if you need to write something original, you'd be completely lost. The linked book is free and gets into all of the necessary information. I also recommend referring to the actual documentation on the python website. It may be a little tedious at first, but the habit of looking at the primary source of information rather than other peoples interpretation of it will save you a lot of headaches in the future.
Regarding RTB, keep in mind it's a hobby project of one guy (Gordon Henderson). It's not intended to be used as an everyday programming language, but something to introduce the basics. You won't find much third party information on it. All the information you need can be found here http://project-downloads.drogon.net/rtb/rtb.pdf