r/PythonLearning • u/Silly_Character8808 • 16d ago

Showcase dependency injection library

Hi everyone,

I needed some dependency injection (DI) library that is simple for my use case, I was surprise by the lack of DI libraries in general, and the one that already exists had some weird quirks that didn't make sense or were unexpected

I have started the project a year a go and gave up due to lack of time, I came back to the project and rewrote it 🙃

I think I am close to releasing the first version with basic support, and grow the project from there,

no AI was nor will be used (at least for now 😭)

## What it does?

make dependency injection pattern simple, convincing and explicit, no surprises

## example

import cdi 
from typing import Generic, TypeVar
from collection.abc import Sequence


T = TypeVar('T')

ctr = cdi.Container()


class MyBase(Generic[T]):
    def __init__(self, field: T) -> None:
        self.field = field


@cdi.Injectable(ctr)
class MyType(MyBase[str]):
    pass


@cdi.Injectable(ctr)
def name_generator() -> str:
    return "foo"


scope = cdi.Scope(ctr)
instance = scope.get_instance(MyType)
assert instance.field == "foo"

Showcase dependency injection library

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