Composition vs Inheritance in Python: Designing Classes That Scale
A single class in isolation is easy — real applications need multiple classes that collaborate. This lesson covers the two fundamental relationships between classes and the framework for choosing between them.
You'll build a manager class that contains other objects (composition, the "has-a" relationship), and a specialized subclass that extends a base class (inheritance, the "is-a" relationship). We cover encapsulation, how super().__init__() calls a parent's constructor, and a decision table that reliably tells you which pattern fits. The lesson lands on the single most important OOP design principle — the Golden Rule: prefer composition over inheritance — and explains why it leads to more maintainable, testable code.
📄 Full written lesson, code examples & exercises → https://markumreed.github.io/ism3232/...
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