from dependency_injector import containers, providers from dependency_injector.wiring import Provide, inject class Container(containers.DeclarativeContainer): config = providers.Configuration() api_client = providers.Singleton( ApiClient, api_key=config.api_key, timeout=config.timeout, ) service = providers.Factory( Service, api_client=api_client, ) @inject def main(service: Service = Provide[Container.service]) -> None: ... if __name__ == "__main__": container = Container() container.config.api_key.from_env("API_KEY", required=True) container.config.timeout.from_env("TIMEOUT", as_=int, default=5) container.wire(modules=[__name__]) main() # <-- dependency is injected automatically with container.api_client.override(mock.Mock()): main() # <-- overridden dependency is injected automatically · With the Dependency Injector, object assembling is consolidated in the container.

When you call the main() function the Service dependency is assembled and injected automatically. When you do testing, you call the container.api_client.override() method to replace the real API client with a mock.

Another possible way to override container providers on declarative level is @containers.override() decorator: import sqlite3 from unittest import mock from dependency_injector import containers, providers class Container(containers.DeclarativeContainer): database = providers.Singleton(sqlite3.connect, ":memory:") # Overriding ``Container`` with ``OverridingContainer``: @containers.override(Container) class OverridingContainer(containers.DeclarativeContainer): database = providers.Singleton(mock.Mock) if __name__ == "__main__": container = Container() database = container.database() assert isinstance(database, mock.Mock)

You can use a context manager for overriding a provider with Provider.override():. The overriding will be reset when context closed. Dependency injection framework for Python by Roman Mogylatov

Dependency Injector is a dependency injection framework for Python. It helps implement the dependency injection principle. ... Providers. Provides Factory, Singleton, Callable, Coroutine, Object, List, Dict, Configuration, Resource, Dependency, and Selector providers that help assemble your objects. See Providers. Overriding...

You can override any provider with another provider. It also helps you in a re-configuring project for different environments: replace an API client with a stub on the dev or stage. Objects assembling is consolidated in a container. Dependency injections are defined explicitly.

October 16, 2020 - To override a provider you need to call the Provider.override() method. This method receives a single argument called overriding. If the overriding value is a provider, this provider is called instead of the original.

May 7, 2026 - Framework overrides: Use built-in override tools such as FastAPI.dependency_overrides in FastAPI or dependency_injector.override() in dependency-injector.

September 10, 2020 - You can override any provider with another provider. It also helps you in configuring project for the different environments: replace an API client with a stub on the dev or stage.

August 25, 2022 - I chose this because it’s much cleaner, and overridden container reverts to the original when the context closes, allowing other test cases to override the container again. # The top level application where the containers are registered import application from unittest.mock import MagicMock from dependency_injector import containers, providers # This will live outside the test file obviously, but we'll test out # the feature_class provided by this container class FeatureContainer(containers.DeclarativeContainer): application_configuration = providers.resource(Configuration) # An example whic

.. currentmodule:: dependency_injector.containers · The container can be overridden by the other container. All of the providers from the overriding container will override the providers with the same names in the overridden container.

February 28, 2021 - class Potato: .... class Salad: .... potato_provider = providers.Singleton(Potato) salad_provider = providers.Factory( Salad, potato=potato_provider ) ... def test_that_my_singleton_is_usable(): with potato_provider as p: # Currently not possible, goal is to get rid of the cached instance at the end of the test, in a non convoluted manner self.assertIsInstance(p, Potato) def test_something_else_by_hiding_underlying_dependency(): # Currently possible because override with potato_provider.override(create_autospec(Potato)) as potato_mock: salad = salad_provider() ...

October 16, 2020 - Hi, I think in previous versions is was possible to do something like: containers.override(BaseContainer): class OverrideContainer: .... Afterwards c = BaseContainer() would contain all the overrid...

See the example at Provider overriding. If you need to inject not the whole object but the parts see Injecting provided object attributes, items, or call its methods. To create a new provider see Creating a custom provider. Providers module API docs - dependency_injector.providers

class dependency_injector.providers.AbstractCallable¶ ... Abstract callable provider. AbstractCallable is a Callable provider that must be explicitly overridden before calling.

To provide a dependency you need to override the Dependency provider. You can call provider .override() method or provide an overriding provider when creating a container. See Provider overriding.

:param provider: Overriding provider. :type provider: :py:class:`Provider` · :raise: :py:exc:`dependency_injector.errors.Error` · :return: Overriding context. :rtype: :py:class:`OverridingContext` """ if provider is self: raise Error("Provider {0} could not be overridden with itself".format(self)) ·

January 19, 2024 - import dependency_injector.containers as dic import dependency_injector.providers as dip class UnitOfWork: ... class TestUnitOfWork(UnitOfWork): ... class ApplicationContainer(dic.DeclarativeContainer): unit_of_work_class = dip.Callable(UnitOfWork) uow = dip.Factory(unit_of_work_class) class TestApplicationContainer(ApplicationContainer): unit_of_work_class = dip.Callable(TestUnitOfWork) container = TestApplicationContainer() print(container.uow()) with container.unit_of_work_class.override(TestUnitOfWork): print(container.uow())

In tests use inject.configure(callable, ... tearDown(self): inject.clear() You can reuse configurations and override already registered dependencies to fit the needs in different environments or specific tests....

Configures injector and providers. ... Override to configure bindings. ... An experimental way to declare noninjectable dependencies utilizing a PEP 593 implementation in Python 3.9.