Python Protocols: Static Duck Typing and the Evolution of Inheritance

Python's inheritance mechanism has always been interesting. Traditionally, Python uses type-based inheritance, similar to Java. However, the flexibility of duck typing (implemented through magic methods) is limited. PEP 544 introduces Protocols, allowing the definition of structural subtyping, also known as static duck typing. By inheriting from the Protocol class, developers can declare a set of methods; any class implementing these methods will be considered an instance of that protocol. This solves the scalability issues of traditional duck typing, resulting in cleaner, more maintainable code.