Why Dataclasses Disappear in Real Python Applications
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💡 Learn how to design great software in 7 steps: https://arjan.codes/designguide. In this video, I take a deep dive into Python dataclasses in 2025. Are they still useful now that we have Pydantic, FastAPI, SQLAlchemy, and other tools? I walk through real-world examples showing when you should use dataclasses, Pydantic models, and how to design your models cleanly. I’ll also build a small FastAPI app with SQLAlchemy and SQLite to demonstrate proper separation between domain models and API schemas. 🔥 GitHub Repository: https://git.arjan.codes/2025/dataclasses. 🎓 ArjanCodes Courses: https://www.arjancodes.com/courses. 🔖 Chapters: 0:00 Intro 1:11 Quick Refresher – What Are Dataclasses? 4:09 Dataclasses vs Pydantic – And a Real FastAPI Example 6:36 Separate Domain and API Models 8:51 Hybrid Approach in Pydantic 11:53 When Do I Use Dataclasses 14:03 Final Thoughts #arjancodes #softwaredesign #python
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