Concepts and features

Concept

With Injection you can implement the principle of Dependency Injection. Dependency Injection (DI) - providing a process to an external software component. This is a specific form of “inversion of control” (IoC) when applied to dependency management. In accordance with the verification principle, the responsible entity outsources the construction of the dependencies it requires from outside, specifically designed for this general mechanism (Wikipedia source).

Using this framework you can reduce coupling and stop monkeypatching your tests. Instead of monkeypatching you can pass mock objects or any other objects as parameters.

Features

The public API of this framework is almost completely identical to Dependency Injector, because the author found it successful and understandable. In addition, this will provide an easy migration to the current framework with Dependency Injector (see migration from Dependency Injector). Other features and advantages:

  • support Python 3.8-3.13;

  • works with FastAPI, Litestar, Flask and Django REST Framework;

  • support dependency injection via Annotated in FastAPI;

  • support async injections;

  • support auto injection by types;

  • resources with function scope;

  • no wiring;

  • overriding dependencies for testing;

  • 100% code coverage;

  • the code is fully typed and checked with mypy.