Python 3 Deep Dive Part 4 Oop High Quality

Introduced in typing.Protocol , structural typing implements "duck typing" via static type checkers. A class satisfies a Protocol by matching its structural shape, without needing formal inheritance. Use code with caution. 4. The Descriptor Protocol

| Pillar | Python Implementation Notes | |-------------------|---------------------------------------------------------------------------------------------| | | No true private – use _single (protected) and __double (name mangling) convention. | | Inheritance | Multiple inheritance possible – but use super() correctly and prefer mixins. | | Polymorphism | Duck typing + abstract base classes (ABCs) for structural subtyping. | | Abstraction | abc.ABC + @abstractmethod to define interfaces without implementation. | python 3 deep dive part 4 oop high quality