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$15 is pretty high for 4 python exercises, especially without any examples to show what they would entail.

I'm soon going to set up some sample exercises for people to see.

But even now, if you dislike it after the first month, cancel and I'll refund your purchase.

Or: Read any of my free e-mail courses (http://lerner.co.il/e-mail-courses/), and you'll see the sorts of exercises I write.

Also: I'd like to think that it's not just exercises, but also the community of other solvers and my explanations.