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Using Assertions in Python

Learn how to use assertions for error handling purposes in Python.

We'll cover the following...

When assertions are used
Implementing assertions
Relationship between assertions and exception handling

Assertions are to be used for situations that should never happen, so the expression on the assert statement has to mean an impossible condition. Should this condition happen, it means there is a defect in the software.

When assertions are used

In contrast to the error handling approach, there are situations in which we don't want our program to continue its execution if a particular error occurs. This is because, in some cases, the error cannot be overcome and our program cannot correct its course of execution (or self-heal). So it's better to fail fast and let the error be noticed, so it can be corrected in the next version upgrade.

The idea of using assertions is to prevent the program from causing further damage if such an invalid scenario is presented. Sometimes, it is better to stop and let the program crash rather than let it continue processing under the wrong assumptions. ...

Preface

Introduction to Clean Code, Code Formatting, and Tools

Pythonic Code

General Traits of Good Code

The SOLID Principles

Using Decorators to Improve Our Code

Getting More Out of Our Objects with Descriptors

Generators, Iterators, and Asynchronous Programming

Unit Testing and Refactoring

Common Design Patterns

Clean Architecture

Conclusion

Using Assertions in Python

When assertions are used