Update dependency injection example in introduction/what_is_di.rst

docs/introduction/what_is_di.rst

@@ -81,14 +81,14 @@ Example
 
 Let's go through the code of ``example.py``:
 
-.. literalinclude:: ../../examples/ioc_di_demos/example.py
+.. literalinclude:: ../../examples/di_demo/example.py
    :language: python
    :linenos:
 
 At some point, things defined above mean, that the code from ``example.py``, 
-could look different, like in ``example_ioc.py``:
+could look different, like in ``example_di.py``:
 
-.. literalinclude:: ../../examples/ioc_di_demos/example_ioc.py
+.. literalinclude:: ../../examples/di_demo/example_di.py
    :language: python
    :linenos:
 

examples/di_demo/example_di.py

@@ -1,4 +1,4 @@
-"""The Code, that follows inversion of control principle."""
+"""The Code, that demonstrates dependency injection pattern."""
 
 
 class Service(object):

examples/ioc_di_demos/car_engine.py

@@ -1,17 +0,0 @@
-"""Car & Engine example."""
-
-
-class Engine(object):
-    """Example engine."""
-
-
-class Car(object):
-    """Example car."""
-
-    def __init__(self):
-        """Initializer."""
-        self.engine = Engine()  # Engine is a "hardcoded" dependency
-
-
-if __name__ == '__main__':
-    car = Car()  # Application creates Car's instance

examples/ioc_di_demos/car_engine_ioc.py

@@ -1,18 +0,0 @@
-"""Refactored Car & Engine example that demonstrates inversion of control."""
-
-
-class Engine(object):
-    """Example engine."""
-
-
-class Car(object):
-    """Example car."""
-
-    def __init__(self, engine):
-        """Initializer."""
-        self.engine = engine  # Engine is an "injected" dependency
-
-
-if __name__ == '__main__':
-    engine = Engine()  # Application creates Engine's instance
-    car = Car(engine)  # and inject it into the Car's instance

examples/ioc_di_demos/car_engine_ioc_container.py

@@ -1,19 +0,0 @@
-"""Example of inversion of control container for Car & Engine example."""
-
-import dependency_injector.containers as containers
-import dependency_injector.providers as providers
-
-import car_engine_ioc
-
-
-class Container(containers.DeclarativeContainer):
-    """IoC container of component providers."""
-
-    engine = providers.Factory(car_engine_ioc.Engine)
-
-    car = providers.Factory(car_engine_ioc.Car,
-                            engine=engine)
-
-
-if __name__ == '__main__':
-    car = Container.car()  # Application creates Car's instance