cmake & pep8 tidy up, also some style edits.

remove unneeded collection length function.

doc/python_api/examples/bpy.app.handlers.1.py

@@ -15,6 +15,6 @@ from bpy.app.handlers import persistent
 
 @persistent
 def load_handler(dummy):
-   print("Load Handler:", bpy.data.filepath)
+    print("Load Handler:", bpy.data.filepath)
 
 bpy.app.handlers.load_post.append(load_handler)

doc/python_api/examples/bpy.app.handlers.py

@@ -6,7 +6,8 @@ This script shows the most simple example of adding a handler.
 
 import bpy
 
+
 def my_handler(scene):
-   print("Frame Change", scene.frame_current)
+    print("Frame Change", scene.frame_current)
 
 bpy.app.handlers.frame_change_pre.append(my_handler)