O’Reilly: Free as in Freedom, online edition. You can also buy “Free as in Freedom” on paper, if that sort of thing appeals to you. The book is GFDL-licensed. (Read more about the GFDL.)
Incidentally, this is the same license I use for Dive Into Python, although so far no one has approached me about publishing it on paper. Just as well. It’s not really done, and needs a lot of editing and reorganization. The first three chapters are excellent, but then it sort of wanders off. My next book will be more focused.
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