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

The principles of test-driven development

Testing is one of the most important elements of the software development process. It is so important that there is even a software development methodology called Test-Driven Development (TDD). It advocates writing software requirements as tests as the first (and foremost) step in developing code.

The principle is simple: you focus on the tests first. Use them to describe the behavior of the software, verify it, and check for potential errors. Only when those tests are complete should you proceed with the actual implementation to satisfy the tests.

TDD, in its simplest form, is an iterative process that consists of the following steps:

  1. Write tests: Tests should reflect the specification of a functionality or improvement that has not been implemented yet.
  2. Run tests: At this stage all new tests should fail as the feature or improvement is not yet implemented.
  3. Write a minimal valid implementation: The code should...