Introduction to design patterns

Let's say that during application development, you stumble upon a problem that pops up again and again. Frustrated, you ask your co-developers or a community for help. Guess what, you are not alone. Many have encountered a similar problem in their code. Luckily, you get a response from someone who has found a solution. This solution seemed to have worked reliably on similar problems. You change your problematic code so that it conforms to the suggested design, and voila! Your problem is resolved!

What we just discussed is a software design pattern. A software design pattern is a tried and tested solution or a strategy that helps us solve a commonly encountered problem in the code. Let's start with the broad categories of design patterns followed by some important design principles.

Note

The Gang of Four book:

Before beginning any discussion on the design patterns in Python, it is worth noting that there is an excellent book you may want on your bookshelf...