API Doc: improvements/fixes regarding new requirements for __init__/__del__

doc/python_api/examples/bpy.types.Operator.6.py

@@ -19,6 +19,8 @@ by returning ``{'RUNNING_MODAL'}``, initializing the modal loop.
 Notice ``__init__()`` and ``__del__()`` are declared.
 For other operator types they are not useful but for modal operators they will
 be called before the :class:`Operator.invoke` and after the operator finishes.
+Also see the
+:ref:`class construction and destruction section <info_overview_class_construction_destruction>`
 """
 import bpy
 
@@ -28,13 +30,13 @@ class ModalOperator(bpy.types.Operator):
     bl_label = "Simple Modal Operator"
     bl_options = {'REGISTER', 'UNDO'}
 
-    def __init__(self):
-        super().__init__()
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
         print("Start")
 
     def __del__(self):
-        super().__del__()
         print("End")
+        super().__del__()
 
     def execute(self, context):
         context.object.location.x = self.value / 100.0

doc/python_api/examples/bpy.types.RenderEngine.1.py

@@ -17,14 +17,19 @@ class CustomRenderEngine(bpy.types.RenderEngine):
     # Init is called whenever a new render engine instance is created. Multiple
     # instances may exist at the same time, for example for a viewport and final
     # render.
-    def __init__(self):
+    # Note the generic arguments signature, and the call to the parent class
+    # `__init__` methods, which are required for Blender to create the underlying
+    # `RenderEngine` data.
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
         self.scene_data = None
         self.draw_data = None
 
     # When the render engine instance is destroy, this is called. Clean up any
     # render engine data here, for example stopping running render threads.
     def __del__(self):
-        pass
+        # Own delete code...
+        super().__del__()
 
     # This is the method called by Blender for both final renders (F12) and
     # small preview for materials, world and lights.