Udacity had a great Python course back in the day (Programming 101, for Python 2.7) It had vidoes and then a REPL would drop down and you would continue writin

Udacity had a great Python course back in the day (Programming 101, for Python 2.7) It had vidoes and then a REPL would drop down and you would continue writing your program, test it against test cases and then a new video would go on for a few minutes explaining the theory for the next step. I can see why not many try and do this. It obviously took a lot of work, both technically and pedagogically to set up the course and problems.