ioc1.py

from collections import defaultdict


class Context(object):

    def __init__(self):
        self._classes = {}
        self._instances = {}

    def feature(self, component_cls):
        class Feature(object):

            def __init__(self2, feature_cls):
                self2._wrapped = feature_cls()

            def __getattr__(self2, name):
                return getattr(self2._wrapped, name)

        class CallWrapper(object):

            def __init__(self2, feature_cls):
                self2._feature_cls = feature_cls
                self._classes[component_cls].append(self2)

            def __call__(self2):
                return Feature(self2._feature_cls)

        return CallWrapper

    def component(self, cls):
        class ComponentWrapper(object):
            def __init__(self2, name, *args, **kwargs):
                self2._wrapped = cls(*args, **kwargs)
                self._instances[name] = {
                    feature_cls() for feature_cls in self._classes[ComponentWrapper]
                }

            def __getattr__(self2, name):
                return getattr(self2._wrapped, name)

        self._classes[ComponentWrapper] = []
        return ComponentWrapper


context = Context()


@context.component
class MatComponent(object):

    def __init__(self, *args, **kwargs):
        self.x = 'component'

    def f(self):
        print('MatComponent1.f')


@context.feature(MatComponent)
class MatFeature1(object):

    def __init__(self, *args, **kwargs):
        self.x = 'feature'



def main():
    mc1 = MatComponent('a')
    print(type(mc1))
    print(mc1.x)
    mc1.f()


if __name__ == '__main__':
    main()