Software Design in Python - Stop Passing Primitives Everywhere (Use Value Objects)

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What you'll learn

This course includes

31.5 hours of video
Certificate of completion
Access on mobile and TV

Summary

Keywords

value object python python value objects primitive obsession domain driven design python ddd python clean code python python design patterns software design python python architecture immutable objects python python dataclasses modeling domain concepts

Full Transcript

🧱 Build software that lasts. Join the Software Design Mastery waiting list → https://arjan.codes/mastery. In this video, I show how to use the Value Object pattern in Python to model prices, percentages, and email addresses properly. I’ll enforce invariants once, eliminate ambiguity (is 0.2 equal to 20%?), and make invalid states hard to represent, without adding unnecessary complexity. 🔥 GitHub Repository: https://git.arjan.codes/2026/value. 🎓 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 1:44 Primitive Obsession (The Actual Problem) 2:30 The “Before” Example (Looks Fine, Isn’t) 3:10 What a Value Object Actually Is 3:47 Price as a Value Object (Behaves Like a Float) 5:39 Percentage as a Value Object (Kills Ambiguity) 7:27 Keep Business Logic as a Function 10:27 Second Example: EmailAddress as a Dataclass Value Object 12:03 Quick Mention: Pydantic 12:33 Why Enums Aren’t Value Objects 13:08 Final Thoughts #arjancodes #softwaredesign #python