I haven't read it yet myself, but the below book just came out: http://www.amazon.com/Python-3-Object-Oriented-Programming/dp/1849511268/ref=cm_cr_pr_sims_t
I'm not aware of any other book that focuses exclusively on OO in Python, though you'll find good intros to the topic in a number of the "classics," such as the newest Learning Python (4th Edition) and Core Python (2nd Edition).
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