I really like Beginner Python: Using Python 2.6 and 3.1, in the Wrox Programmer to Programmer series. It's very good at explaining basic concepts and syntax (which it looks likes you already know), but it also shows you some really cool and overlooked features and shows you how to do some really cool things with Python(make sockets, set up an HTTP server, extend Python with C, access databases, fly, discover the secret to life, etc.)
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