Lesson 08 · Python
Object-Oriented Design: Composition, Dataclasses & Properties
Cut class boilerplate with @dataclass, lock values with frozen=True, build bigger objects by composing smaller ones, and guard state with @property - the everyday OOP toolkit.
Prerequisites: Object-Oriented Design: Inheritance, ABCs & Protocols
Learning objectives
By the end of this lesson, you will be able to:
- Write dataclasses with field defaults and the auto-generated __init__, __repr__ and __eq__
- Choose frozen dataclasses for value objects and explain what freezing prevents
- Compose classes from other classes and delegate work to the parts
- Enforce rules with @property getters and validating setters
- Decide between composition and inheritance honestly