diana 3.0.0b3

Simple Dependency Injector for python

A simple async-friendly dependency injection framework for Python 3.

Supports:

• Async methods

• Parametrized dependencies

• Type annotations

Simple Example

import diana

class MyThing(object):
    def __init__(self, prefix):
        self.prefix = prefix

    def get(self, suffix):
        return self.prefix + suffix

class MyModule(diana.Module):
    @diana.provider
    def provide_thing(self) -> MyThing:
        return MyThing("a_prefix_")


@diana.injector
def requires_a_thing(*, thing: MyThing):
    return thing.get('suffix')

if __name__ == '__main__':
    diana.injector.load_module(MyModule())

    requires_a_thing()  # returns "a_prefix_suffix"

Parametrized Dependencies

import diana
import typing

Snake = typing.NewType('Snake', str)

class SnakeModule(diana.Module):
    @diana.provider
    def provide_snake(self, length: int) -> Snake:
        return Snake('-' + ('=' * length) + e)


@diana.inject(a_snake=Snake)
@diana.param('a_snake', length=5)
def snake_printer(a_snake):
    print(a_snake, "Hissss")

if __name__ == '__main__':
    diana.injector.load_module(SnakeModule())

    snake_printer() # Prints: -=====e Hissss