Object-Oriented Programming in Python

There are only some problems have the answer (less than 5% of the total). This was not a problem because David Letscher, one of the author, was my professor, since he rarely used problem from the book for the tests and the final. There is also a small problem with the graphic library, cs1graphics.py which people need to use for some covered topics, is not completed. However, Of all learning Python books I've read, this book is the best. It covers basic to advanced topics in a very well-organized way with clear explanations.