Python Essential Reference, 4th Edition
By: David Breazley, DaBeaz
I enjoyed this one a lot. This book isn’t filled with Fibonacci generators and I haven’t found anyone else with a better understanding of files than David.
Core Python Programming, 2nd Edition
By: Wesley Chun
This is one the best free e-books available and there isn’t’ any reason if you work with Python not to have this. On a side note, I hear he is about to make his code to generate PowerPoint from plain text open source soon.
Dive Into Python
By: Mark Pilgrim
Another great free e-book. This one is written for people either new to python or programming but either way it’s a great stepping stone for working with Python.
Learn Python The Hard Way
By: Zed Shaw
Another good resource and this book is made publicly available on in HTML format.
Crash Into Python
By: Stephen Sugden
An excellent quick reference to use if you already have experience programming.
David Breazley’s website