deps

Python >=3.6 dependency injection based on attrs. Very simple, yet powerful.

Inspired by inject-attrs.

Usage

deps works only with typing annotations defined as presented below!

1. First, replace your @attr.s(...) decorators:

   @attr.s(auto_attribs=True, <other args/kwargs...>)
   class Thing:
     cfg: Config
     some_dep: SomeClass

   With:

   import deps
   
   @deps.s(<other args/kwargs...>)
   class Thing:
       cfg: IConfig
       some_dep: ISomeClass

   Notice that auto_attribs=True is no more needed, it will be forced by this package.

2. Next you have to prepare - somewhere in your codebase - an abstract interfaces classes for your attributes:

   import deps
   
   class IConfig(deps.Interface)
       # ...
   
   class ISomeClass(deps.Interface)
       # ...

3. Now prepare interfaces implementations:

   from interfaces import IConfig, ISomeClass
   
   class Config(IConfig)
       # ...
   
   class SomeClass(ISomeClass)
       # ...

4. Finally, configure dependency injection bindings provided by Inject package, using bind_to_constructor directive.

License

MIT

Creator

Daniel Kuruc