I built a complete OOP capstone in Python | E-commerce domain model | Series finale

🏆 SERIES FINALE. 11 lessons of theory. ONE real codebase that proves it. Build a complete e-commerce shopping cart: Product, LineItem, Cart, DiscountStrategy (Protocol), PaymentMethod (Adapter), OrderID (full dunder kit). 37 tests pass in 0.18s. No mocking library — duck-typed mocks. The proof your OOP knowledge actually ships.

🎯 WHAT YOU'LL BUILD

- Money + Product (frozen dataclasses with factories)
- LineItem + Cart (composition + @property + container dunders)
- DiscountStrategy (Protocol + 3 implementations) — Strategy pattern
- PaymentMethod + StripeAdapter — Adapter pattern
- OrderID with full dunder kit
- pytest tests with duck-typed mocks (no mocking lib!)

📌 Chapters
0:00 Series finale intro
0:30 Domain map — 7 classes, 3 patterns
1:00 Money + Product (value objects)
2:00 LineItem + Cart (entities)
3:00 DiscountStrategy (Strategy pattern)
4:00 PaymentMethod + StripeAdapter
4:30 Order + checkout flow
5:00 Tests — 0.18s, no mocking library
5:30 Concept map: every L → every line
6:00 What you shipped 🏆
📚 dargslan.com — IT eBooks (Linux, DevOps, Cybersecurity, Python)

🏆 OOP BEGINNERS GUIDE — COMPLETE 13/13

#Python #OOP #Capstone #DomainModel #ModernPython

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