Book Image

Expert Python Programming - Fourth Edition

By : Michał Jaworski, Tarek Ziadé
Book Image

Expert Python Programming - Fourth Edition

By: Michał Jaworski, Tarek Ziadé

Overview of this book

This new edition of Expert Python Programming provides you with a thorough understanding of the process of building and maintaining Python apps. Complete with best practices, useful tools, and standards implemented by professional Python developers, this fourth edition has been extensively updated. Throughout this book, you’ll get acquainted with the latest Python improvements, syntax elements, and interesting tools to boost your development efficiency. The initial few chapters will allow experienced programmers coming from different languages to transition to the Python ecosystem. You will explore common software design patterns and various programming methodologies, such as event-driven programming, concurrency, and metaprogramming. You will also go through complex code examples and try to solve meaningful problems by bridging Python with C and C++, writing extensions that benefit from the strengths of multiple languages. Finally, you will understand the complete lifetime of any application after it goes live, including packaging and testing automation. By the end of this book, you will have gained actionable Python programming insights that will help you effectively solve challenging problems.
Table of Contents (16 chapters)
14
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15
Index

What is concurrency?

Concurrency is often confused with actual methods of implementing it. Some programmers also think that it is a synonym for parallel processing. This is the reason why we need to start by properly defining concurrency. Only then will we be able to properly understand various concurrency models and their key differences.

First and foremost, concurrency is not the same as parallelism. Concurrency is also not a matter of application implementation. Concurrency is a property of a program, algorithm, or problem, whereas parallelism is just one of the possible approaches to problems that are concurrent.

In Leslie Lamport's 1976 paper Time, Clocks, and the Ordering of Events in Distributed Systems, he defines the concept of concurrency as follows:

"Two events are concurrent if neither can causally affect the other."

By extrapolating events to programs, algorithms, or problems, we can say that something is concurrent if it can be fully or...