Learn Python the Hard way is a free html tutorial series by Zed Shaw. It's a very practical guide to learning Python for those with no programming background.
You can do it on most any computer. It works on Windows, Mac OSX, and Linux with instructions for all three in the first exercise.
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Available online for free.
Teaches by giving a piece of code and letting the user see what the code does.
Pro Encourages use of flash cards
To help better remember certain parts of the language, the author suggests using flash cards.
Con Suggests looking up details on the web
The book often suggests looking up details on the web instead of providing them. Additionally, no resources are suggested where to look up such information. As a result the quality of explanation of details can vary based on used resource.