Software Design in Python - The Builder Pattern in Python: Finally Explained!

💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. In this video, I show you the Builder Pattern in Python. It’s a practical and underrated design pattern you’re probably already using without realizing it. We’ll explore how it helps you build complex objects step by step with a clean, fluent API, avoiding massive constructors and fragile nested dictionaries. You’ll see a hands-on example of generating an HTML UI and learn when (and when not) to use this pattern. 🔥 GitHub Repository: https://git.arjan.codes/2025/builder. 🎓 ArjanCodes Courses: https://www.arjancodes.com/courses. 💬 Join my Discord server: https://discord.arjan.codes. ⌨️ Keyboard I’m using: https://amzn.to/49YM97v. 🔖 Chapters: 0:00 Intro 0:49 Step 1 — The Product 2:45 What is the Builder Pattern? 5:05 Step 2 — The Builder 8:16 Quick Side Note: Why not just use a big constructor? 9:02 Step 3 — Extend builder 11:11 Bonus — Local Viewer (Infrastructure) 12:10 When Should You Use the Builder Pattern? 13:55 Final Thoughts #arjancodes #softwaredesign #python