The textbook is titled Python for Informatics: Exploring Information. The book is free to download in all major electronic formats including: PDF, EPUB, MOBI, HTML, and Apple's iBooks. The free iBooks version of the book contains enhanced video materials and exercises built into the book. You can purchase a printed copy of the book from Amazon for $8.99. It is not necessary to purchase the printed book. All of the book materials are available under a Creative Commons Attribution-NonCommercial 3.0 Unported License.