I've added some more comments as many people asked for them. I initially tried to keep it very simple to the point where you read a little piece of code and thi

I've added some more comments as many people asked for them. I initially tried to keep it very simple to the point where you read a little piece of code and think to yourself that's really cool and I want to try it out in Python 3. But you're right and a little text can help put things in the right context which might not be immediately obvious.