modern-di

Project	Badges
modern-di
modern-di-fastapi
modern-di-faststream
modern-di-litestar
modern-di-typer
modern-di-pytest

modern-di is a python dependency injection framework which supports the following:

• Automatic dependency graph based on type annotations
• Also, explicit dependencies are allowed where needed
• Scopes and context management
• Python 3.10+ support
• Fully typed and tested
• Integrations with FastAPI, FastStream, LiteStar and Typer
• Pytest integration (modern-di-pytest) — turns any DI dependency into a pytest fixture

Install

uv add modern-di      # or: pip install modern-di

Quick Start

import dataclasses
from modern_di import Container, Group, Scope, providers


@dataclasses.dataclass(kw_only=True, slots=True, frozen=True)
class Settings:
    database_url: str = "postgresql+asyncpg://localhost/app"


@dataclasses.dataclass(kw_only=True, slots=True)
class UserRepository:
    settings: Settings  # auto-injected by type


class Dependencies(Group):
    settings = providers.Factory(scope=Scope.APP, creator=Settings)
    user_repository = providers.Factory(scope=Scope.REQUEST, creator=UserRepository)


with Container(groups=[Dependencies], validate=True) as container:
    with container.build_child_container(scope=Scope.REQUEST) as request:
        repo = request.resolve(UserRepository)
        print(repo.settings.database_url)

See the documentation for scopes, lifecycles, finalizers, and framework integrations.

Usage examples:

• with LiteStar - litestar-sqlalchemy-template
• with FastAPI - fastapi-sqlalchemy-template

📚 Documentation

📦 PyPI

📝 License

Part of modern-python

Browse the full list of templates and libraries in modern-python — see the org profile for the categorized index.