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That Depends

Welcome to the that-depends documentation!

that-depends is a python dependency injection framework which, among other things, supports the following:

  • Async and sync dependency resolution
  • Scopes and granular context management
  • Dependency injection anywhere
  • Fully typed and tested
  • Compatibility with popular frameworks like FastAPI and LiteStar
  • Python 3.10+ support

Installation

pip install that-depends

uv add that-depends

Quickstart

Define a creator

async def create_async_resource():
    logger.debug("Async resource initiated")
    try:
        yield "async resource"
    finally:
        logger.debug("Async resource destructed")

Setup Dependency Injection Container with Providers

from that_depends import BaseContainer, providers

class Container(BaseContainer):
    provider = providers.Resource(create_async_resource)

See the containers documentation for more information on defining the container.

For a list of providers and their usage, see the providers section.

Resolve dependencies in your code

await Container.provider()

Inject providers in function arguments

from that_depends import inject, Provide

@inject
async def some_foo(value: str = Provide[Container.provider]):
    return value

await some_foo() # "async resource"

See the injection documentation for more information.

llms.txt

that-depends provides a llms.txt file.

You can find documentation on how to use it here.