Sakis Kasampalis - Mastering Python Design Patterns

Sakis Kasampalis (@SKasampalis) is a software engineer living in the Netherlands. He is not dogmatic about particular programming languages and tools; his principle is that the right tool should be used for the right job. One of his favorite tools is Python because he finds it very productive.

Sakis was also the technical reviewer of Mastering Object-oriented Python and Learning Python Design Patterns , published by Packt Publishing.

I want to thank my sweetheart, Georgia, for supporting this effort. Many thanks to Owen Roberts who encouraged me to write this book. I also want to thank Sumeet Sawant for being a very kind and cooperative content development editor. Last but not least, I want to thank the reviewers of this book for their valuable feedback.

Evan Dempsey is a software developer from Waterford, Ireland. When he isn't hacking in Python for fun and profit, he enjoys craft beers, common Lisp, and keeping up with modern research in machine learning. He is a contributor to several open source projects.

Amitabh Sharma is a professional software engineer. He has worked extensively on enterprise applications in telecommunications and business analytics. His work is focused on service-oriented architecture, data warehouses, and languages such as Java, Python, and others.

I would like to thank my grandfather and my father for allowing me to learn all that I can. I would also like to thank my wife, Komal, for her support and encouragement.

Yogendra Sharma was born and brought up in a small but cultural town, Pratapgarh, in the state of Rajasthan. His basic education has been imparted in his hometown itself, and he completed his BTech in Computer Science from Jaipur. He is basically an engineer by heart and a technical enthusiast by nature.

He has vast experience in the fields of Python, Django framework, web app security, networking, Web 2.0, and C++.

Along with CCNA, many other esteemed certifications have been awarded to him. He is an active member of International Association of Engineers, Ubuntu, India, and Computer Society of India.

More recently, he participated in bug bounty programs and won many bug bounties, including the respected Yahoo, Ebay, PayPal bug bounty. He has been appointed as security researcher for several respected organizations, such as Adobe, Ebay, Avira, Moodle, Cisco, Atlassian, Basecamp, CodeClimate, Abacus, Rediff, Assembla, RecruiterBox, Tumbler, Wrike, Indeed, HybridSaaS, Sengrid, and SnapEngag.

He has reviewed many books from reputed publishing houses. You can find him on LinkedIn at http://in.linkedin.com/in/yogendra0sharma.

I would like to thank all my friends who always encouraged me to do something new and believing in me.

Patrycja Szabowska is a Python developer with some Java background, with experience mainly in backend development. She graduated from Nicolaus Copernicus University in Toru, Poland.

She is currently working in Warsaw, Poland, at Grupa Wirtualna Polska. She is constantly exploring technical novelties and is open-minded and eager to learn about the next Python library or framework. Her favorite programming motto is Code is read much more often than it is written.

I'd like to thank my husband, Wacaw, for encouraging me to explore new frontiers, and also my parents for teaching me what matters the most.

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Preface

Design patterns

In software engineering, a design pattern is a recommended solution to a software design problem. Design patterns generally describe how to structure our code to solve common design problems using best practices. It is important to note that a design pattern is a high-level solution; it doesn't focus on implementation details such as algorithms and data structures [GOF95, page 13], [j.mp/srcmdp]. It is up to us, as software engineers, to decide which algorithm and data structure is optimal to use for the problem we are trying to solve.