pep8 cleanup, also print message when attempting to run in animation player mode.

doc/python_api/examples/blf.py

@@ -1,6 +1,7 @@
 """
 Hello World Text Example
 ++++++++++++++++++++++++
+
 Blender Game Engine example of using the blf module. For this module to work we
 need to use the OpenGL wrapper :class:`~bgl` as well.
 """
@@ -11,31 +12,33 @@ from bge import logic
 import bgl
 import blf
 
+
 def init():
     """init function - runs once"""
     # create a new font object, use external ttf file
     font_path = logic.expandPath('//Zeyada.ttf')
-	# store the font indice - to use later
+    # store the font indice - to use later
     logic.font_id = blf.load(font_path)
 
-    # set the font drawing routine to run every frame   
+    # set the font drawing routine to run every frame
     scene = logic.getCurrentScene()
-    scene.post_draw=[write]
+    scene.post_draw = [write]
+
 
 def write():
     """write on screen"""
     width = render.getWindowWidth()
     height = render.getWindowHeight()
-    
+
     # OpenGL setup
     bgl.glMatrixMode(bgl.GL_PROJECTION)
     bgl.glLoadIdentity()
     bgl.gluOrtho2D(0, width, 0, height)
     bgl.glMatrixMode(bgl.GL_MODELVIEW)
     bgl.glLoadIdentity()
-    
+
     # BLF drawing routine
     font_id = logic.font_id
-    blf.position(font_id, (width*0.2), (height*0.3), 0)
+    blf.position(font_id, (width * 0.2), (height * 0.3), 0)
     blf.size(font_id, 50, 72)
     blf.draw(font_id, "Hello World")