that-depends

Simple, typed dependency injection framework for Python.

Features:

• Simple async-first DI framework with IOC-container.
• Python 3.10+ support.
• Full coverage by types annotations (mypy in strict mode, pyrefly).
• Built-in FastAPI, FastStream and Litestar integrations.
• Dependency context management with scopes.
• Overriding dependencies for tests.
• Injecting dependencies in functions and coroutines without wiring.

pip install that-depends

that-depends is part of the modern-python family. If you're starting a new project, consider modern-di, the newer DI framework from the same author, with separate framework adapters:

• modern-di: core DI framework with scopes
• modern-di-fastapi, modern-di-litestar, modern-di-faststream, modern-di-typer, modern-di-pytest

that-depends remains actively maintained. See the migration guide if you want to move existing projects across.

The modern-python org profile has the full categorized list of templates and libraries.