Nanoinject is a terrifically small and simple dependency injection container
Project description
Nanoinject
Nanoinject is a terrifically small and simple dependency injection container for Python 3.6+. Its' key features:
- Easy enough to use in five minutes.
- Configurable in code or config files.
- Pretty feature complete.
Installation
pip install nanoinject
Use guide
Dependency injection is a way to achieve Inversion of Control.
Use in code
class A:
value = 42
class B:
def __init__(self, a):
self.a = a
c = Container()
c.add('a', lambda c: A())
c.add('b', lambda c: B(c.get('a')))
assert 42 == c.get('b').a.value
Using configuration
It starts with declaring your services in YAML format:
values:
scalar_value: 42
services:
a:
class: A
module: example.a
dependencies:
- value:scalar_value
b:
class: B
module: example.b
dependencies:
- a
And then letting the config object configure the container based on that YAML file:
import os
from nanoinject import Container, Config
class A:
def __init__(self, value):
self.value = value
class B:
def __init__(self, a):
self.a = a
c = Container()
config = Config.from_yaml_file(os.path.dirname(__file__) + '/services.yaml')
config.config(c)
assert 42 == c.get('b').a.value
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