Add working prototype, requires deep refactoring

src/dependency_injector/containers.pyi

@@ -8,12 +8,13 @@ from typing import (
     ClassVar,
     Callable as _Callable,
     Iterable,
+    Iterator,
     TypeVar,
     Awaitable,
     overload,
 )
 
-from .providers import Provider, Self
+from .providers import Provider, Self, ProviderParent
 
 
 C_Base = TypeVar('C_Base', bound='Container')
@@ -47,11 +48,14 @@ class Container:
     def resolve_provider_name(self, provider: Provider) -> str: ...
     @property
     def parent_name(self) -> str: ...
+    @property
+    def parent(self) -> ProviderParent: ...
+    def set_parent(self, parent: ProviderParent) -> None: ...
     @overload
-    def traverse(self, types: Optional[Iterable[Type[TT]]] = None) -> _Iterator[TT]: ...
+    def traverse(self, types: Optional[Iterable[Type[TT]]] = None) -> Iterator[TT]: ...
     @classmethod
     @overload
-    def traverse(self, types: Optional[Iterable[Type[TT]]] = None) -> _Iterator[TT]: ...
+    def traverse(cls, types: Optional[Iterable[Type[TT]]] = None) -> Iterator[TT]: ...
 
 
 class DynamicContainer(Container): ...

src/dependency_injector/containers.pyx

@@ -66,6 +66,7 @@ class DynamicContainer(Container):
         self.provider_type = providers.Provider
         self.providers = {}
         self.overridden = tuple()
+        self.parent = None
         self.declarative_parent = None
         self.wired_to_modules = []
         self.wired_to_packages = []
@@ -83,6 +84,7 @@ class DynamicContainer(Container):
 
         copied.provider_type = providers.Provider
         copied.overridden = providers.deepcopy(self.overridden, memo)
+        copied.parent = providers.deepcopy(self.parent, memo)
         copied.declarative_parent = self.declarative_parent
 
         copied.__self__ = providers.deepcopy(self.__self__, memo)
@@ -108,12 +110,14 @@ class DynamicContainer(Container):
 
         :rtype: None
         """
-        if isinstance(value, providers.Provider) and not isinstance(value, providers.Self):
+        if isinstance(value, providers.Provider) \
+                and not isinstance(value, providers.Self) \
+                and name != 'parent':
             _check_provider_type(self, value)
 
             self.providers[name] = value
 
-            if isinstance(value, (providers.Dependency, providers.DependenciesContainer)):
+            if isinstance(value, (providers.Dependency, providers.DependenciesContainer, providers.Container)):
                 value.set_parent(self)
 
         super(DynamicContainer, self).__setattr__(name, value)
@@ -303,8 +307,15 @@ class DynamicContainer(Container):
     @property
     def parent_name(self):
         """Return parent name."""
+        if self.parent:
+            return self.parent.parent_name
+
         return self.declarative_parent.__name__
 
+    def set_parent(self, parent):
+        """Set parent."""
+        self.parent = parent
+
     def resolve_provider_name(self, provider):
         """Try to resolve provider name."""
         # TODO: add tests

src/dependency_injector/providers.pxd

@@ -227,6 +227,7 @@ cdef class Container(Provider):
     cdef object __container_cls
     cdef dict __overriding_providers
     cdef object __container
+    cdef object __parent
 
     cpdef object _provide(self, tuple args, dict kwargs)
 

src/dependency_injector/providers.pyi

@@ -368,6 +368,11 @@ class Container(Provider[T]):
     def __getattr__(self, name: str) -> Provider: ...
     @property
     def container(self) -> T: ...
+    @property
+    def parent_name(self) -> str: ...
+    @property
+    def parent(self) -> ProviderParent: ...
+    def set_parent(self, parent: ProviderParent) -> None: ...
 
 
 class Selector(Provider[Any]):

src/dependency_injector/providers.pyx

@@ -3522,23 +3522,38 @@ cdef class Container(Provider):
 
         if container is None:
             container = container_cls()
+            container.set_parent(self)
         self.__container = container
 
-        self.apply_overridings()
+        if self.__container and self.__overriding_providers:
+            self.apply_overridings()
+
+        self.__parent = None
 
         super(Container, self).__init__()
 
     def __deepcopy__(self, memo):
         """Create and return full copy of provider."""
+        cdef Container copied
+
         copied = memo.get(id(self))
         if copied is not None:
             return copied
 
-        copied = self.__class__(
-            self.__container_cls,
-            deepcopy(self.__container, memo),
-            **deepcopy(self.__overriding_providers, memo),
+        copied = self.__class__(self.__container_cls, UNDEFINED)
+        memo[id(self)] = copied
+
+        copied.__container = deepcopy(self.__container, memo)
+        copied.__overriding_providers = deepcopy(self.__overriding_providers, memo)
+        copied.apply_overridings()
+
+        # TODO: remove duplication
+        copied_parent = (
+            deepcopy(self.__parent, memo)
+            if is_provider(self.parent) or is_container_instance(self.parent)
+            else self.parent
         )
+        copied.set_parent(copied_parent)
 
         return copied
 
@@ -3574,6 +3589,20 @@ cdef class Container(Provider):
         declarative container initialization."""
         self.__container.override_providers(**self.__overriding_providers)
 
+    @property
+    def parent_name(self):
+        """Return parent name."""
+        return f'{self.parent.parent_name}.{self.parent.resolve_provider_name(self)}'
+
+    @property
+    def parent(self):
+        """Return parent."""
+        return self.__parent
+
+    def set_parent(self, parent):
+        """Set parent."""
+        self.__parent = parent
+
     @property
     def related(self):
         """Return related providers generator."""