An undergraduate in the lab with no prior programming experience has tried out a couple tutorials for "Intro to Python." The student said that this introduction, from CodeAcademy has been the most accessible: https://www.codecademy.com/learn/python
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Nov 6 update: One great feature of the codecademy is that it has a terminal emulator, so you can run all of your commands in the browser, and don't need to be concerned about what operating system you have.