If you’re no longer a newbie to Python, one of the most important programming techniques called “Design Pattern” is a must-known one. Design patterns are usually best practices and the most effective approaches to solve some typical problems and requirements in software development.

In this article, I will introduce one of the most popular design patterns — Singleton. It is a special way of defining a class that ensures that it can only have one instance at a time.

I’ll start with how to write a singleton class in a standard way. Then, the main focus of this article is to show you some typical and practical examples of code. Therefore, we will know when to use it and what are the best practices of this design pattern.

1. How to Write A Basic Singleton

Before writing a singleton class, let’s have a look at a normal class. So, later on, we can compare it with the singleton.

1.1 A Normal Class