Al Sweigart is a software developer and the author of _Automate the Boring Stuff with Python_, _Invent Your Own Computer Games with Python_, _Making Games with Python & Pygame_, and _Hacking Secret Ciphers with Python_. These books are freely available under a Creative Commons license at [http://inventwithpython.com][1]. Al enjoys haunting coffee shops, writing educational materials, cat whispering, and making useful software. He lives in San Francisco. [1]: http://inventwithpython.com