I'm the author of Programming Python, a comprehensive book about the freeware programming language Python. It was first published by O'Reilly & Associates in October, 1996, as part of their popular Nutshell series (the books with the animals on their covers). As of 3/30/99, this book is in its eighth printing; a Japanese translation was recently released as well (Spring, 1998). See the links below for book information.
If you're looking for pure reference material, or a kindler, gentler Python introduction, be sure to also check out these: