"If you can't test it, don't build it. If you don't test it, rip it out."
Boris Beizer
Python comes with a variety of testing frameworks which are dead simple to use. You really have no excuse not to test your code as you're writing it.
I've put together a short video where you get to look over my shoulder as I refactor the FizzBuzz program. Even though this problem is completely artificial, it still has enough complexity to make refactoring a worthwhile exercise.
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