Add implementation, typing stubs, and tests

src/dependency_injector/providers.pyi

@@ -176,6 +176,8 @@ class CoroutineDelegate(Delegate):
 class ConfigurationOption(Provider[Any]):
     UNDEFINED: object
     def __init__(self, name: Tuple[str], root: Configuration) -> None: ...
+    def __enter__(self) -> ConfigurationOption: ...
+    def __exit__(self, *exc_info: Any) -> None: ...
     def __getattr__(self, item: str) -> ConfigurationOption: ...
     def __getitem__(self, item: Union[str, Provider]) -> ConfigurationOption: ...
     @property
@@ -203,6 +205,8 @@ class TypedConfigurationOption(Callable[T]):
 class Configuration(Object[Any]):
     DEFAULT_NAME: str = 'config'
     def __init__(self, name: str = DEFAULT_NAME, default: Optional[Any] = None, *, strict: bool = False) -> None: ...
+    def __enter__(self) -> Configuration : ...
+    def __exit__(self, *exc_info: Any) -> None: ...
     def __getattr__(self, item: str) -> ConfigurationOption: ...
     def __getitem__(self, item: Union[str, Provider]) -> ConfigurationOption: ...
     def get_name(self) -> str: ...

src/dependency_injector/providers.pyx

@@ -1415,6 +1415,12 @@ cdef class ConfigurationOption(Provider):
 
         return copied
 
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *exc_info):
+        pass
+
     def __str__(self):
         return represent_provider(provider=self, provides=self.get_name())
 
@@ -1740,6 +1746,12 @@ cdef class Configuration(Object):
 
         return copied
 
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *exc_info):
+        pass
+
     def __str__(self):
         return represent_provider(provider=self, provides=self.__name)
 

tests/unit/providers/test_configuration_py2_py3.py

@@ -243,6 +243,33 @@ class ConfigTests(unittest.TestCase):
         with self.assertRaises(AttributeError):
             a.__name__
 
+    def test_context_manager_alias(self):
+        class Container(containers.DeclarativeContainer):
+            config = providers.Configuration()
+
+        container = Container()
+
+        with container.config as cfg:
+            cfg.override({'foo': 'foo', 'bar': 'bar'})
+
+        self.assertEqual(container.config(), {'foo': 'foo', 'bar': 'bar'})
+        self.assertEqual(cfg(), {'foo': 'foo', 'bar': 'bar'})
+        self.assertIs(container.config, cfg)
+
+    def test_option_context_manager_alias(self):
+        class Container(containers.DeclarativeContainer):
+            config = providers.Configuration()
+
+        container = Container()
+
+        with container.config.option as opt:
+            opt.override({'foo': 'foo', 'bar': 'bar'})
+
+        self.assertEqual(container.config(), {'option': {'foo': 'foo', 'bar': 'bar'}})
+        self.assertEqual(container.config.option(), {'foo': 'foo', 'bar': 'bar'})
+        self.assertEqual(opt(), {'foo': 'foo', 'bar': 'bar'})
+        self.assertIs(container.config.option, opt)
+
     def test_missing_key(self):
         # See: https://github.com/ets-labs/python-dependency-injector/issues/358
         self.config.override(None)