python-dependency-injector/examples/providers/provided_instance_complex.py

"""Complex example of the injecting of provided instance attributes and items."""

from dependency_injector import providers


class Service:

    def __init__(self, value):
        self.value = value

    def get_value(self):
        return self.value


service = providers.Singleton(Service, value=42)

dependency = providers.Object(
    {
        'foo': {
            'bar': 10,
            'baz': lambda arg: {'arg': arg}
        },
    },
)

demo_list = providers.List(
    dependency.provided['foo']['bar'],
    dependency.provided['foo']['baz'].call(22)['arg'],
    dependency.provided['foo']['baz'].call(service)['arg'],
    dependency.provided['foo']['baz'].call(service)['arg'].value,
    dependency.provided['foo']['baz'].call(service)['arg'].get_value.call(),
)

if __name__ == '__main__':
    assert demo_list() == [
        10,
        22,
        service(),
        42,
        42,
    ]