The goal of the 3rd revised edition of the book is to introduce the reader to the science of computers, following an experimental approach that involves solving consecutive problems using the Python programming language. Python is a powerful programming language that is rapidly evolving.

It is characterized by its ease of learning, making it suitable for introduction to programming, while its open nature has contributed to the development of a large number of libraries that can contribute to problem solving, such as data analysis, text processing, distributed programming, etc.

The book is structured into 3 parts and 17 chapters. The first part concerns the introduction of basic computer concepts and programming with Python; the second part deals with advanced programming topics: object-oriented programming and user interface programming; the third part attempts to provide an overview of areas of computer science guided by Python: digital arithmetic, computer organization, databases, operating systems, networking and protocols, social dimensions of informatics.

The reader is called upon step by step to solve interesting problems, such as creating a card game, while learning about the structure and operation of computers as well as the problem-solving process with a computer.

Additional material with example code and problems is available on the book's website at www.cup.gr.