Learning Python by Ascher and Lutz has a very good introduction to objects and object-oriented programming. If you're new to programming, I definitely recommend the text. Also, check out Mark Pilgrim's chapter on OOP in Dive Into Python at http://www.diveintopython.org/object_oriented_framework/index.html (Incidentally, Dive Into Python is my favorite programming book, tremendously well written, and free to read online at http://www.diveintopython.org. I loved the book so much I went out to the bookstore and bought a copy.)
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