The book contains Python libraries used in many applications. Internet, Downloads, JSON, REST are covered. Utilities such as time, random, regular expressions are included. The operating systems & process are explained in detail. File system operations and Pathlib are covered. Some introductions to Big Data & Artificial Intelligence are added. CSV, Samples are explained as a preperation for data science. Visual libraries such as PIL & Matplotlib are included. Speech Recognition is covered. Finally Tk is is explained & a full sample application is supplied. Önder Teker, the author of the book, develops projects since the end of the 1990s, gives courses and lectures since the beginning of the 2000s, and produces printed and electronic books and visual courses since the beginning of the 2010s.