Structure Matters: Mastering the Final Four Design Patterns in Python

Learn how to simplify, secure, and scale your Python projects using the last four structural design patterns: Bridge, Proxy, Facade, and Flyweight.

Writing good code is one thing, but keeping that code organized and easy to manage as your project grows? That’s a whole different ball game.

I struggled with this constantly. Like I know how the code works and writing the code, but when trying to write good software so it could be scaled later, sometimes is tough.

That is why I am writing here about this, a topic that one grasped is a lifesaver over time, this has helped me grow in more ways than one.

This was also the topic of last article, but it was too much. Last article I covered the different types of patterns and when we use them. I only covered the first three structural design patterns.

This time, we’re finishing up the series by looking at the last four: Decorator, Proxy, Facade, and Flyweight. Each one solves a certain problem, and once you understand them, you’ll notice spots where they make sense in your own projects.

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These not about how things are made or how they behave — they’re about how everything connects and fits together. You can think of them like a plan for putting your code in order, especially when your app gets bigger.

We already saw the first three structural patterns — Adapter, Decorator, and Composite — and saw how they link different parts of a system.

Now let’s get started and make your Python code simpler to follow, easier to change, and more enjoyable to work with.

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The Different Kinds of Design Patterns in Software

If you’ve been reading along then you know about the three main types: creational, structural, and behavioral. Creational patterns help you handle how objects are made. Behavioral patterns are all about how objects talk to each other and work together, okay great.

Then you’ve got structural patterns, which focus on how everything fits together—how different parts of your program are organized and connected.

I’ve been trying to keep these shorter for you guys, so last week I introduced everything about Structural Design Patterns and I broke down the first three patterns.

In this article, I’ll jump straight into the last four design patterns. If you want a refresh and an explanation behind what this style pattern is and why we use it, then refer back to the article here.

The 7 Structural Design Patterns: