tailwindlabs / tailwindcss
github.com·21h ago
Developer Tools
Real Python·Jun 15·5 min read
Implementing Interfaces in Python: ABCs and Protocols
TL;DR
Python lacks a formal interface system, which can lead to inconsistencies in object-oriented design. Abstract Base Classes (ABCs) and Protocols were developed to provide a structured way to define interfaces.
✦ Why It Matters
Engineers can use ABCs and Protocols to create more reliable and maintainable code in Python projects.
Key Takeaways
- Use ABCs to enforce method contracts at instantiation.
- Leverage protocols for structural subtyping without inheritance.
- Utilize duck typing for flexible code that adapts to various classes.
- Implement runtime checks with isinstance() for formal verification.
How It Works
ABCs use inheritance to enforce method implementation, while protocols allow classes to satisfy interfaces based on method signatures, promoting flexibility.