Book Image

Learning Python

By : Fabrizio Romano
Book Image

Learning Python

By: Fabrizio Romano

Overview of this book

Learning Python has a dynamic and varied nature. It reads easily and lays a good foundation for those who are interested in digging deeper. It has a practical and example-oriented approach through which both the introductory and the advanced topics are explained. Starting with the fundamentals of programming and Python, it ends by exploring very different topics, like GUIs, web apps and data science. The book takes you all the way to creating a fully fledged application. The book begins by exploring the essentials of programming, data structures and teaches you how to manipulate them. It then moves on to controlling the flow of a program and writing reusable and error proof code. You will then explore different programming paradigms that will allow you to find the best approach to any situation, and also learn how to perform performance optimization as well as effective debugging. Throughout, the book steers you through the various types of applications, and it concludes with a complete mini website built upon all the concepts that you learned.
Table of Contents (20 chapters)
Learning Python
About the Author
About the Reviewers

Chapter 7. Testing, Profiling, and Dealing with Exceptions


"Code without tests is broken by design."

 --Jacob Kaplan-Moss

Jacob Kaplan-Moss is one of the core developers of the Django web framework. We're going to explore it in the next chapters. I strongly agree with this quote of his. I believe code without tests shouldn't be deployed to production.

Why are tests so important? Well, for one, they give you predictability. Or, at least, they help you achieve high predictability. Unfortunately, there is always some bug that sneaks into our code. But we definitely want our code to be as predictable as possible. What we don't want is to have a surprise, our code behaving in an unpredictable way. Would you be happy to know that the software that checks on the sensors of the plane that is taking you on holidays sometimes goes crazy? No, probably not.

Therefore we need to test our code, we need to check that its behavior is correct, that it works as expected when it deals with edge cases, that it...