Add container base class

docs/main/changelog.rst

@@ -7,6 +7,13 @@ that were made in every particular version.
 From version 0.7.6 *Dependency Injector* framework strictly 
 follows `Semantic versioning`_
 
+Development version
+-------------------
+- Add container base class ``containers.Container``. ``DynamicContainer``
+  and ``DeclarativeContainer`` become subclasses of the ``Container``.
+  See issue: `#386 <https://github.com/ets-labs/python-dependency-injector/issues/386>`_.
+  Thanks to `@ventaquil <https://github.com/ventaquil>`_ for reporting the issue.
+
 4.15.0
 ------
 - Add ``Configuration.from_pydantic()`` method to load configuration from a ``pydantic`` settings.

src/dependency_injector/containers.pyx

@@ -23,7 +23,11 @@ else:
         raise NotImplementedError('Wiring requires Python 3.6 or above')
 
 
-class DynamicContainer(object):
+class Container(object):
+    """Abstract container."""
+
+
+class DynamicContainer(Container):
     """Dynamic inversion of control container.
 
     .. code-block:: python
@@ -370,7 +374,7 @@ class DeclarativeContainerMetaClass(type):
 
 
 @six.add_metaclass(DeclarativeContainerMetaClass)
-class DeclarativeContainer(object):
+class DeclarativeContainer(Container):
     """Declarative inversion of control container.
 
     .. code-block:: python

tests/typing/declarative_container.py

@@ -48,3 +48,11 @@ class Container5(containers.DeclarativeContainer):
 
 
 dependencies: Dict[str, providers.Provider] = Container5.dependencies
+
+
+# Test 6: to check base class
+class Container6(containers.DeclarativeContainer):
+    provider = providers.Factory(int)
+
+
+container6: containers.Container = Container6()

tests/typing/dynamic_container.py

@@ -22,3 +22,6 @@ container4.set_providers(a=providers.Provider())
 # Test 5: to check .dependencies attribute
 container5 = containers.DynamicContainer()
 dependencies: Dict[str, providers.Provider] = container5.dependencies
+
+# Test 6: to check base class
+container6: containers.Container = containers.DynamicContainer()

tests/unit/containers/test_types_py36.py

@@ -0,0 +1,18 @@
+import unittest
+
+from dependency_injector import containers
+
+
+class SomeClass:
+    ...
+
+
+class TypesTest(unittest.TestCase):
+
+    def test_declarative(self):
+        container: containers.Container = containers.DeclarativeContainer()
+        self.assertIsInstance(container, containers.Container)
+
+    def test_dynamic(self):
+        container: containers.Container = containers.DynamicContainer()
+        self.assertIsInstance(container, containers.Container)