Me trying on a ridiculous blazer inside-out.
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Here's a presentation on Iteration in Python that I gave at the first annual PyOhio conference, back in 2008, covering iterators, generators, special methods, and the itertools library. It all seems very elementary to me now, but I remember the talk being very well received. I'm sure that part of it is me being a much better programmer now than I was then, but I also think that Python's iteration paradigms were pretty new to a lot of programmers at the time.