ArjanCodes
33 minutes
Python Dependency Injection using Protocols and Containers to Swap Implementations
Dependency injection is an object-oriented and functional design pattern in software design in which a component receives the collaborators it depends on from the outside instead of constructing them internally, implementing inversion of control and the dependency inversion principle. Depending on abstract contracts (structural protocols or interfaces) rather than concrete implementations decouples high-level logic from low-level details, giving substitutability, testability, and separation of concerns; a dependency injection container is an optional registry of providers that centralizes wiring.