AnyDI

Simple Dependency Injection library that uses Python type annotations.

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AnyDI is a simple Dependency Injection library for Python 3.10+. It works with sync and async applications and uses type annotations (PEP 484).

Main features:

• Type-safe: Uses type hints for dependency resolution.
• Async support: Works with both sync and async code.
• Scopes: Provides singleton, transient, and request scopes. Supports custom scope definitions.
• Named providers: Use Annotated[...] for multiple providers per type.
• Resource management: Context manager protocol support for lifecycle management.
• Modular: Container and module composition for large applications.
• Auto-scan: Automatic discovery of injectable callables.
• Generic support: Automatic TypeVar resolution for generic base classes.
• Framework integrations: Extensions for popular frameworks.
• Testing: Provider override mechanism for test isolation.

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Installation

pip install anydi

Quick example

Define a service (app/services.py)

class GreetingService:
    def greet(self, name: str) -> str:
        return f"Hello, {name}!"

Create the container and providers (app/container.py)

from anydi import Container

from app.services import GreetingService


container = Container()


@container.provider(scope="singleton")
def service() -> GreetingService:
    return GreetingService()

Resolve dependencies directly

from app.container import container
from app.services import GreetingService


service = container.resolve(GreetingService)

if __name__ == "__main__":
    print(service.greet("World"))

Inject into functions (app/main.py)

from anydi import Provide

from app.container import container
from app.services import GreetingService


def greet(service: Provide[GreetingService]) -> str:
    return service.greet("World")


if __name__ == "__main__":
    print(container.run(greet))

Test with overrides (tests/test_app.py)

from unittest import mock

from app.container import container
from app.services import GreetingService
from app.main import greet


def test_greet() -> None:
    service_mock = mock.Mock(spec=GreetingService)
    service_mock.greet.return_value = "Mocked"

    with container.test_mode(), container.override(GreetingService, service_mock):
        result = container.run(greet)

    assert result == "Mocked"

Integrate with FastAPI (app/api.py)

import anydi.ext.fastapi
from fastapi import FastAPI

from anydi import Provide
from app.container import container
from app.services import GreetingService


app = FastAPI()


@app.get("/greeting")
async def greet(
    service: Provide[GreetingService]
) -> dict[str, str]:
    return {"greeting": service.greet("World")}


anydi.ext.fastapi.install(app, container)

Test the FastAPI integration (test_api.py)

from unittest import mock

from fastapi.testclient import TestClient

from app.api import app
from app.container import container
from app.services import GreetingService


client = TestClient(app)


def test_api_greeting() -> None:
    service_mock = mock.Mock(spec=GreetingService)
    service_mock.greet.return_value = "Mocked"

    with container.test_mode(), container.override(GreetingService, service_mock):
        response = client.get("/greeting")

    assert response.json() == {"greeting": "Mocked"}

Integrate with Django Ninja

Install the Django integration extras:

pip install 'anydi-django[ninja]'

Expose the container factory (app/container.py):

from anydi import Container

from app.services import GreetingService


container = Container()


@container.provider(scope="singleton")
def service() -> GreetingService:
    return GreetingService()

Configure Django (settings.py):

INSTALLED_APPS = [
    ...,
    "anydi_django",
]

ANYDI = {
    "CONTAINER_FACTORY": "app.container.container",
    "PATCH_NINJA": True,
}

Wire Django Ninja (urls.py):

from typing import Any

from anydi import Provide
from django.http import HttpRequest
from django.urls import path
from ninja import NinjaAPI

from app.services import GreetingService


api = NinjaAPI()


@api.get("/greeting")
def greet(request: HttpRequest, service: Provide[GreetingService]) -> Any:
    return {"greeting": service.greet("World")}


urlpatterns = [
    path("api/", api.urls),
]

Documentation

Guides: - Getting started - Core Concepts - Providers - Scopes - Dependency Injection - Testing - Reference

Framework integrations: - FastAPI - Django - FastStream - Typer - Pydantic Settings