To achieve writing this book, I would like to thank many people—my partner, Kirsty Johnston, for putting up with my late nights and giving me the confidence I needed; she is the best! I would like to thank my mum and dad, who have always supported me my whole life—thanks for helping me so much. Ian Lance Taylor, my mentor, from Google Summer of Code deserves a special mention. If it wasn't for him, I wouldn't be writing anything like this right now. I would like to thank Robert Bradshaw for mentoring my Cython Auto-PXD project; even though I had a lot going on at the time, he helped me get it done and pass. Special thanks to Nicholas Marriott for helping me with the Tmux code base. I would also like to thank Gordon Hamilton and Dr. Colin Turner for the all the support they have given me. Finally, I would like to thank Tara Simpson, Chris Van Es, Niall Kelly, and Matt McComb for the mentoring they have given me at Instil.