Hello,

I'm a happy user of your package, it's awesome. I come from the .NET stack and find it very useful in Python.

I don't know if it is available or not in the package, but I miss a couple of things that I used a lot in .NET applications.

The first one is the possibility of loading configuration from a .json file. I know that I can use .ini, .yaml, and other formats, but I think it would be good to support .json also.

The second one, and the most important in my opinion, is don't have something similar to this out-of-the-box https://docs.microsoft.com/en-us/aspnet/core/fundamentals/configuration/options?view=aspnetcore-6.0

The idea behind this, it's to allow to inject "part" of the configuration like an object. For now, I'm using a workaround that works perfectly.

config.json

{ "foo": { "bar": "bar", "baz": "baz" }, "qux": "qux" }

foo_options.py

from dataclasses import dataclass @dataclass class FooOptions: bar: str baz: str

containers.py

import json from dacite import from_dict from dependency_injector.containers import DeclarativeContainer, WiringConfiguration from dependency_injector import providers from foo_options import FooOptions def _create_foo_options() -> FooOptions: with open("config.json") as f: return from_dict(FooOptions, json.loads(f.read())["foo"]) # using dacite package https://github.com/konradhalas/dacite class Container(DeclarativeContainer): wiring_config = WiringConfiguration( modules=["__main__"] ) foo_options = providers.Singleton(_create_foo_options)

main.py

from dependency_injector.wiring import inject, Provide from containers import Container from foo_options import FooOptions @inject def main(foo_options: FooOptions = Provide[Container.foo_options]): print(foo_options) # FooOptions(bar='bar', baz='baz') if __name__ == '__main__': container = Container() main()

I would like to know your opinion about this. What I want to avoid is having a big object with all my configuration when a class only needs to be aware of a little part. I know that I can inject concrete values of config using Configuration provider or even the whole config like a dict, but I want to use dataclasses with types safety and don't use primitive values.

Congrats for your great job, I couldn't live without this package :)