set cycles scripts as pep8 & make some minor changes.

also update sphinx doc generator.

7 files changed, 123 insertions, 50 deletions

diff --git a/intern/cycles/blender/addon/__init__.py b/intern/cycles/blender/addon/__init__.py
index f5ea39b7e3c..ccb04eea0a8 100644
--- a/intern/cycles/blender/addon/__init__.py
+++ b/intern/cycles/blender/addon/__init__.py
@@ -16,10 +16,12 @@
 # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 #
 
+# <pep8 compliant>
+
 bl_info = {
     "name": "Cycles Render Engine",
     "author": "",
-    "version": (0,0),
+    "version": (0, 0),
     "blender": (2, 6, 0),
     "api": 41670,
     "location": "Info header, render engine menu",
@@ -38,6 +40,7 @@ from cycles import xml
 from cycles import engine
 from cycles import presets
 
+
 class CyclesRender(bpy.types.RenderEngine):
     bl_idname = 'CYCLES'
     bl_label = "Cycles"
@@ -46,7 +49,7 @@ class CyclesRender(bpy.types.RenderEngine):
     def __init__(self):
         engine.init()
         self.session = None
-    
+
     def __del__(self):
         engine.free(self)
 
@@ -64,7 +67,7 @@ class CyclesRender(bpy.types.RenderEngine):
     #
     # def preview_render(self):
     #    pass
-    
+
     # viewport render
     def view_update(self, context):
         if not self.session:
@@ -75,6 +78,7 @@ class CyclesRender(bpy.types.RenderEngine):
     def view_draw(self, context):
         engine.draw(self, context.region, context.space_data, context.region_data)
 
+
 def register():
     properties.register()
     ui.register()
@@ -82,10 +86,10 @@ def register():
     presets.register()
     bpy.utils.register_module(__name__)
 
+
 def unregister():
     xml.unregister()
     ui.unregister()
     properties.unregister()
     presets.unregister()
     bpy.utils.unregister_module(__name__)
-
diff --git a/intern/cycles/blender/addon/engine.py b/intern/cycles/blender/addon/engine.py
index d0f0d395810..a32a9e91499 100644
--- a/intern/cycles/blender/addon/engine.py
+++ b/intern/cycles/blender/addon/engine.py
@@ -16,8 +16,11 @@
 # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 #
 
+# <pep8 compliant>
+
 import bpy
 
+
 def init():
     import bcycles
     import os.path
@@ -27,7 +30,8 @@ def init():
 
     bcycles.init(path, user_path)
 
-def create(engine, data, scene, region = 0, v3d = 0, rv3d = 0):
+
+def create(engine, data, scene, region=0, v3d=0, rv3d=0):
     import bcycles
 
     data = data.as_pointer()
@@ -41,18 +45,21 @@ def create(engine, data, scene, region = 0, v3d = 0, rv3d = 0):
 
     engine.session = bcycles.create(engine.as_pointer(), data, scene, region, v3d, rv3d)
 
+
 def free(engine):
-    if "session" in dir(engine):
+    if hasattr(engine, "session"):
         if engine.session:
             import bcycles
             bcycles.free(engine.session)
         del engine.session
 
+
 def render(engine):
     import bcycles
     if "session" in dir(engine):
         bcycles.render(engine.session)
 
+
 def update(engine, data, scene):
     import bcycles
     if scene.render.use_border:
@@ -61,6 +68,7 @@ def update(engine, data, scene):
     else:
         bcycles.sync(engine.session)
 
+
 def draw(engine, region, v3d, rv3d):
     import bcycles
     v3d = v3d.as_pointer()
@@ -69,11 +77,12 @@ def draw(engine, region, v3d, rv3d):
     # draw render image
     bcycles.draw(engine.session, v3d, rv3d)
 
+
 def available_devices():
     import bcycles
     return bcycles.available_devices()
 
+
 def with_osl():
     import bcycles
     return bcycles.with_osl()
-
diff --git a/intern/cycles/blender/addon/enums.py b/intern/cycles/blender/addon/enums.py
index 4aef2553050..463fdc19534 100644
--- a/intern/cycles/blender/addon/enums.py
+++ b/intern/cycles/blender/addon/enums.py
@@ -16,8 +16,11 @@
 # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 #
 
+# <pep8 compliant>
+
 from cycles import engine
 
+
 def get_gpu_device():
     available_devices = engine.available_devices()
     cuda = 'cuda' in available_devices
@@ -28,32 +31,36 @@ def get_gpu_device():
         gpu_string = "CUDA GPU"
     else:
         gpu_string = "OpenCL GPU"
-    
+
     return gpu_string
 
 devices = (
-("CPU", "CPU", "Processor"),
-("GPU", get_gpu_device(), "Graphics card"))
+    ("CPU", "CPU", "Processor"),
+    ("GPU", get_gpu_device(), "Graphics card"),
+    )
 
 gpu_type = (
-("CUDA", "CUDA", "NVidia only"),
-("OPENCL", "OpenCL (incomplete)", ""))
+    ("CUDA", "CUDA", "NVidia only"),
+    ("OPENCL", "OpenCL (incomplete)", ""),
+    )
 
 shading_systems = (
-("GPU_COMPATIBLE", "GPU Compatible", "Restricted shading system compatible with GPU rendering"),
-("OSL", "Open Shading Language", "Open Shading Language shading system that only runs on the CPU"))
+    ("GPU_COMPATIBLE", "GPU Compatible", "Restricted shading system compatible with GPU rendering"),
+    ("OSL", "Open Shading Language", "Open Shading Language shading system that only runs on the CPU"),
+    )
 
 displacement_methods = (
-("BUMP", "Bump", "Bump mapping to simulate the appearance of displacement"),
-("TRUE", "True", "Use true displacement only, requires fine subdivision"),
-("BOTH", "Both", "Combination of displacement and bump mapping"))
+    ("BUMP", "Bump", "Bump mapping to simulate the appearance of displacement"),
+    ("TRUE", "True", "Use true displacement only, requires fine subdivision"),
+    ("BOTH", "Both", "Combination of displacement and bump mapping"),
+    )
 
 bvh_types = (
-("DYNAMIC_BVH", "Dynamic BVH", "Objects can be individually updated, at the cost of slower render time"),
-("STATIC_BVH", "Static BVH", "Any object modification requires a complete BVH rebuild, but renders faster"))
+    ("DYNAMIC_BVH", "Dynamic BVH", "Objects can be individually updated, at the cost of slower render time"),
+    ("STATIC_BVH", "Static BVH", "Any object modification requires a complete BVH rebuild, but renders faster"),
+    )
 
 filter_types = (
-("BOX", "Box", "Box filter"),
-("GAUSSIAN", "Gaussian", "Gaussian filter"))
-
-
+    ("BOX", "Box", "Box filter"),
+    ("GAUSSIAN", "Gaussian", "Gaussian filter"),
+    )
diff --git a/intern/cycles/blender/addon/presets.py b/intern/cycles/blender/addon/presets.py
index e5243b633be..e2836b2cc21 100644
--- a/intern/cycles/blender/addon/presets.py
+++ b/intern/cycles/blender/addon/presets.py
@@ -16,9 +16,12 @@
 # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 #
 
+# <pep8 compliant>
+
 from bl_operators.presets import AddPresetBase
 from bpy.types import Operator
 
+
 class AddPresetIntegrator(AddPresetBase, Operator):
     '''Add an Integrator Preset'''
     bl_idname = "render.cycles_integrator_preset_add"
@@ -41,13 +44,14 @@ class AddPresetIntegrator(AddPresetBase, Operator):
     ]
 
     preset_subdir = "cycles/integrator"
-    
+
+
 def register():
     pass
 
+
 def unregister():
     pass
-    
+
 if __name__ == "__main__":
     register()
-
diff --git a/intern/cycles/blender/addon/properties.py b/intern/cycles/blender/addon/properties.py
index bcd3f7d1eac..0c7deb01ed8 100644
--- a/intern/cycles/blender/addon/properties.py
+++ b/intern/cycles/blender/addon/properties.py
@@ -16,6 +16,8 @@
 # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 #
 
+# <pep8 compliant>
+
 import bpy
 from bpy.props import *
 
@@ -23,6 +25,7 @@ import math
 
 from cycles import enums
 
+
 class CyclesRenderSettings(bpy.types.PropertyGroup):
     @classmethod
     def register(cls):
@@ -30,7 +33,7 @@ class CyclesRenderSettings(bpy.types.PropertyGroup):
 
         cls.device = EnumProperty(name="Device", description="Device to use for rendering",
             items=enums.devices, default="CPU")
-            
+
         cls.gpu_type = EnumProperty(name="GPU Type", description="Processing system to use on the GPU",
             items=enums.gpu_type, default="CUDA")
 
@@ -101,6 +104,7 @@ class CyclesRenderSettings(bpy.types.PropertyGroup):
     def unregister(cls):
         del bpy.types.Scene.cycles
 
+
 class CyclesCameraSettings(bpy.types.PropertyGroup):
     @classmethod
     def register(cls):
@@ -112,11 +116,12 @@ class CyclesCameraSettings(bpy.types.PropertyGroup):
             default=0, min=0, max=100)
         cls.aperture_rotation = FloatProperty(name="Aperture Rotation", description="Rotation of blades in aperture",
             default=0, soft_min=-math.pi, soft_max=math.pi, subtype='ANGLE')
-    
+
     @classmethod
     def unregister(cls):
         del bpy.types.Camera.cycles
 
+
 class CyclesMaterialSettings(bpy.types.PropertyGroup):
     @classmethod
     def register(cls):
@@ -128,6 +133,7 @@ class CyclesMaterialSettings(bpy.types.PropertyGroup):
     def unregister(cls):
         del bpy.types.Material.cycles
 
+
 class CyclesLampSettings(bpy.types.PropertyGroup):
     @classmethod
     def register(cls):
@@ -138,6 +144,7 @@ class CyclesLampSettings(bpy.types.PropertyGroup):
     def unregister(cls):
         del bpy.types.Lamp.cycles
 
+
 class CyclesWorldSettings(bpy.types.PropertyGroup):
     @classmethod
     def register(cls):
@@ -147,6 +154,7 @@ class CyclesWorldSettings(bpy.types.PropertyGroup):
     def unregister(cls):
         del bpy.types.World.cycles
 
+
 class CyclesVisibilitySettings(bpy.types.PropertyGroup):
     @classmethod
     def register(cls):
@@ -162,6 +170,7 @@ class CyclesVisibilitySettings(bpy.types.PropertyGroup):
     def unregister(cls):
         del bpy.types.Object.cycles_visibility
 
+
 class CyclesMeshSettings(bpy.types.PropertyGroup):
     @classmethod
     def register(cls):
@@ -181,6 +190,7 @@ class CyclesMeshSettings(bpy.types.PropertyGroup):
         del bpy.types.Curve.cycles
         del bpy.types.MetaBall.cycles
 
+
 def register():
     bpy.utils.register_class(CyclesRenderSettings)
     bpy.utils.register_class(CyclesCameraSettings)
@@ -189,7 +199,8 @@ def register():
     bpy.utils.register_class(CyclesWorldSettings)
     bpy.utils.register_class(CyclesVisibilitySettings)
     bpy.utils.register_class(CyclesMeshSettings)
-    
+
+
 def unregister():
     bpy.utils.unregister_class(CyclesRenderSettings)
     bpy.utils.unregister_class(CyclesCameraSettings)
@@ -198,4 +209,3 @@ def unregister():
     bpy.utils.unregister_class(CyclesWorldSettings)
     bpy.utils.unregister_class(CyclesMeshSettings)
     bpy.utils.unregister_class(CyclesVisibilitySettings)
-
diff --git a/intern/cycles/blender/addon/ui.py b/intern/cycles/blender/addon/ui.py
index 7c7d4c81b89..6cebe3d24e4 100644
--- a/intern/cycles/blender/addon/ui.py
+++ b/intern/cycles/blender/addon/ui.py
@@ -16,6 +16,8 @@
 # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 #
 
+# <pep8 compliant>
+
 import bpy
 
 from bpy.types import Panel, Menu
@@ -23,6 +25,7 @@ from bpy.types import Panel, Menu
 from cycles import enums
 from cycles import engine
 
+
 class CYCLES_MT_integrator_presets(Menu):
     bl_label = "Integrator Presets"
     preset_subdir = "cycles/integrator"
@@ -30,16 +33,18 @@ class CYCLES_MT_integrator_presets(Menu):
     COMPAT_ENGINES = {'CYCLES'}
     draw = Menu.draw_preset
 
+
 class CyclesButtonsPanel():
     bl_space_type = "PROPERTIES"
     bl_region_type = "WINDOW"
     bl_context = "render"
-    
+
     @classmethod
     def poll(cls, context):
         rd = context.scene.render
         return rd.engine == 'CYCLES'
 
+
 class CyclesRender_PT_integrator(CyclesButtonsPanel, Panel):
     bl_label = "Integrator"
     bl_options = {'DEFAULT_CLOSED'}
@@ -49,7 +54,7 @@ class CyclesRender_PT_integrator(CyclesButtonsPanel, Panel):
 
         scene = context.scene
         cscene = scene.cycles
-        
+
         row = layout.row(align=True)
         row.menu("CYCLES_MT_integrator_presets", text=bpy.types.CYCLES_MT_integrator_presets.bl_label)
         row.operator("render.cycles_integrator_preset_add", text="", icon="ZOOMIN")
@@ -87,7 +92,8 @@ class CyclesRender_PT_integrator(CyclesButtonsPanel, Panel):
         #row = col.row()
         #row.prop(cscene, "blur_caustics")
         #row.active = not cscene.no_caustics
-        
+
+
 class CyclesRender_PT_film(CyclesButtonsPanel, Panel):
     bl_label = "Film"
 
@@ -99,7 +105,7 @@ class CyclesRender_PT_film(CyclesButtonsPanel, Panel):
 
         split = layout.split()
 
-        col = split.column();
+        col = split.column()
         col.prop(cscene, "film_exposure")
         col.prop(cscene, "film_transparent")
 
@@ -109,6 +115,7 @@ class CyclesRender_PT_film(CyclesButtonsPanel, Panel):
         if cscene.filter_type != 'BOX':
             sub.prop(cscene, "filter_width", text="Width")
 
+
 class CyclesRender_PT_performance(CyclesButtonsPanel, Panel):
     bl_label = "Performance"
     bl_options = {'DEFAULT_CLOSED'}
@@ -142,6 +149,7 @@ class CyclesRender_PT_performance(CyclesButtonsPanel, Panel):
         sub.prop(cscene, "debug_bvh_type", text="")
         sub.prop(cscene, "debug_use_spatial_splits")
 
+
 class CyclesRender_PT_layers(CyclesButtonsPanel, Panel):
     bl_label = "Layers"
     bl_options = {'DEFAULT_CLOSED'}
@@ -178,6 +186,7 @@ class CyclesRender_PT_layers(CyclesButtonsPanel, Panel):
 
         layout.prop(rl, "material_override", text="Material")
 
+
 class Cycles_PT_post_processing(CyclesButtonsPanel, Panel):
     bl_label = "Post Processing"
     bl_options = {'DEFAULT_CLOSED'}
@@ -196,6 +205,7 @@ class Cycles_PT_post_processing(CyclesButtonsPanel, Panel):
         col = split.column()
         col.prop(rd, "dither_intensity", text="Dither", slider=True)
 
+
 class CyclesCamera_PT_dof(CyclesButtonsPanel, Panel):
     bl_label = "Depth of Field"
     bl_context = "data"
@@ -229,6 +239,7 @@ class CyclesCamera_PT_dof(CyclesButtonsPanel, Panel):
         sub.prop(ccam, "aperture_blades", text="Blades")
         sub.prop(ccam, "aperture_rotation", text="Rotation")
 
+
 class Cycles_PT_context_material(CyclesButtonsPanel, Panel):
     bl_label = "Surface"
     bl_context = "material"
@@ -277,6 +288,7 @@ class Cycles_PT_context_material(CyclesButtonsPanel, Panel):
             split.template_ID(space, "pin_id")
             split.separator()
 
+
 class Cycles_PT_mesh_displacement(CyclesButtonsPanel, Panel):
     bl_label = "Displacement"
     bl_context = "data"
@@ -300,8 +312,9 @@ class Cycles_PT_mesh_displacement(CyclesButtonsPanel, Panel):
             cdata = mball.cycles
 
         layout.prop(cdata, "displacement_method", text="Method")
-        layout.prop(cdata, "use_subdivision");
-        layout.prop(cdata, "dicing_rate");
+        layout.prop(cdata, "use_subdivision")
+        layout.prop(cdata, "dicing_rate")
+
 
 class CyclesObject_PT_ray_visibility(CyclesButtonsPanel, Panel):
     bl_label = "Ray Visibility"
@@ -311,7 +324,7 @@ class CyclesObject_PT_ray_visibility(CyclesButtonsPanel, Panel):
     @classmethod
     def poll(cls, context):
         ob = context.object
-        return CyclesButtonsPanel.poll(context) and ob and ob.type in ('MESH', 'CURVE', 'CURVE', 'SURFACE', 'FONT', 'META') # todo: 'LAMP'
+        return CyclesButtonsPanel.poll(context) and ob and ob.type in ('MESH', 'CURVE', 'CURVE', 'SURFACE', 'FONT', 'META')  # todo: 'LAMP'
 
     def draw(self, context):
         layout = self.layout
@@ -330,6 +343,7 @@ class CyclesObject_PT_ray_visibility(CyclesButtonsPanel, Panel):
         col.prop(visibility, "transmission")
         col.prop(visibility, "shadow")
 
+
 def find_node(material, nodetype):
     if material and material.node_tree:
         ntree = material.node_tree
@@ -337,16 +351,18 @@ def find_node(material, nodetype):
         for node in ntree.nodes:
             if hasattr(node, 'type') and node.type == nodetype:
                 return node
-    
+
     return None
 
+
 def find_node_input(node, name):
     for input in node.inputs:
         if input.name == name:
             return input
-    
+
     return None
 
+
 def panel_node_draw(layout, id, output_type, input_name):
     if not id.node_tree:
         layout.prop(id, "use_nodes", icon='NODETREE')
@@ -359,10 +375,11 @@ def panel_node_draw(layout, id, output_type, input_name):
         layout.label(text="No output node.")
     else:
         input = find_node_input(node, input_name)
-        layout.template_node_view(ntree, node, input);
-    
+        layout.template_node_view(ntree, node, input)
+
     return True
 
+
 class CyclesLamp_PT_lamp(CyclesButtonsPanel, Panel):
     bl_label = "Lamp"
     bl_context = "data"
@@ -401,7 +418,8 @@ class CyclesLamp_PT_lamp(CyclesButtonsPanel, Panel):
             layout.label(text="Not supported, interpreted as point lamp.")
         elif lamp.type == 'HEMI':
             layout.label(text="Not supported, interpreted as sun lamp.")
-   
+
+
 class CyclesLamp_PT_nodes(CyclesButtonsPanel, Panel):
     bl_label = "Nodes"
     bl_context = "data"
@@ -417,6 +435,7 @@ class CyclesLamp_PT_nodes(CyclesButtonsPanel, Panel):
         if not panel_node_draw(layout, lamp, 'OUTPUT_LAMP', 'Surface'):
             layout.prop(lamp, "color")
 
+
 class CyclesWorld_PT_surface(CyclesButtonsPanel, Panel):
     bl_label = "Surface"
     bl_context = "world"
@@ -432,6 +451,7 @@ class CyclesWorld_PT_surface(CyclesButtonsPanel, Panel):
         if not panel_node_draw(layout, world, 'OUTPUT_WORLD', 'Surface'):
             layout.prop(world, "horizon_color", text="Color")
 
+
 class CyclesWorld_PT_volume(CyclesButtonsPanel, Panel):
     bl_label = "Volume"
     bl_context = "world"
@@ -440,7 +460,7 @@ class CyclesWorld_PT_volume(CyclesButtonsPanel, Panel):
     @classmethod
     def poll(cls, context):
         world = context.world
-        return False # world and world.node_tree and CyclesButtonsPanel.poll(context)
+        return False  # world and world.node_tree and CyclesButtonsPanel.poll(context)
 
     def draw(self, context):
         layout = self.layout
@@ -449,6 +469,7 @@ class CyclesWorld_PT_volume(CyclesButtonsPanel, Panel):
         world = context.world
         panel_node_draw(layout, world, 'OUTPUT_WORLD', 'Volume')
 
+
 class CyclesMaterial_PT_surface(CyclesButtonsPanel, Panel):
     bl_label = "Surface"
     bl_context = "material"
@@ -464,6 +485,7 @@ class CyclesMaterial_PT_surface(CyclesButtonsPanel, Panel):
         if not panel_node_draw(layout, mat, 'OUTPUT_MATERIAL', 'Surface'):
             layout.prop(mat, "diffuse_color")
 
+
 class CyclesMaterial_PT_volume(CyclesButtonsPanel, Panel):
     bl_label = "Volume"
     bl_context = "material"
@@ -472,7 +494,7 @@ class CyclesMaterial_PT_volume(CyclesButtonsPanel, Panel):
     @classmethod
     def poll(cls, context):
         mat = context.material
-        return False #mat and mat.node_tree and CyclesButtonsPanel.poll(context)
+        return False  # mat and mat.node_tree and CyclesButtonsPanel.poll(context)
 
     def draw(self, context):
         layout = self.layout
@@ -485,6 +507,7 @@ class CyclesMaterial_PT_volume(CyclesButtonsPanel, Panel):
 
         layout.prop(cmat, "homogeneous_volume")
 
+
 class CyclesMaterial_PT_displacement(CyclesButtonsPanel, Panel):
     bl_label = "Displacement"
     bl_context = "material"
@@ -500,6 +523,7 @@ class CyclesMaterial_PT_displacement(CyclesButtonsPanel, Panel):
         mat = context.material
         panel_node_draw(layout, mat, 'OUTPUT_MATERIAL', 'Displacement')
 
+
 class CyclesMaterial_PT_settings(CyclesButtonsPanel, Panel):
     bl_label = "Settings"
     bl_context = "material"
@@ -523,6 +547,7 @@ class CyclesMaterial_PT_settings(CyclesButtonsPanel, Panel):
         col = split.column()
         col.prop(cmat, "sample_as_light")
 
+
 class CyclesTexture_PT_context(CyclesButtonsPanel, Panel):
     bl_label = ""
     bl_context = "texture"
@@ -535,7 +560,7 @@ class CyclesTexture_PT_context(CyclesButtonsPanel, Panel):
         tex = context.texture
         space = context.space_data
         pin_id = space.pin_id
-        use_pin_id = space.use_pin_id;
+        use_pin_id = space.use_pin_id
         user = context.texture_user
         node = context.texture_node
 
@@ -555,7 +580,7 @@ class CyclesTexture_PT_context(CyclesButtonsPanel, Panel):
                 col.template_ID(space, "pin_id")
             elif user:
                 col.template_ID(user, "texture", new="texture.new")
-            
+
             if tex:
                 row = split.row()
                 row.prop(tex, "use_nodes", icon="NODETREE", text="")
@@ -566,6 +591,7 @@ class CyclesTexture_PT_context(CyclesButtonsPanel, Panel):
                     split.label(text="Type:")
                     split.prop(tex, "type", text="")
 
+
 class CyclesTexture_PT_nodes(CyclesButtonsPanel, Panel):
     bl_label = "Nodes"
     bl_context = "texture"
@@ -581,6 +607,7 @@ class CyclesTexture_PT_nodes(CyclesButtonsPanel, Panel):
         tex = context.texture
         panel_node_draw(layout, tex, 'OUTPUT_TEXTURE', 'Color')
 
+
 class CyclesTexture_PT_node(CyclesButtonsPanel, Panel):
     bl_label = "Node"
     bl_context = "texture"
@@ -597,6 +624,7 @@ class CyclesTexture_PT_node(CyclesButtonsPanel, Panel):
         ntree = node.id_data
         layout.template_node_view(ntree, node, None)
 
+
 class CyclesTexture_PT_mapping(CyclesButtonsPanel, Panel):
     bl_label = "Mapping"
     bl_context = "texture"
@@ -628,6 +656,7 @@ class CyclesTexture_PT_mapping(CyclesButtonsPanel, Panel):
         row.prop(mapping, "mapping_y", text="")
         row.prop(mapping, "mapping_z", text="")
 
+
 class CyclesTexture_PT_colors(CyclesButtonsPanel, Panel):
     bl_label = "Color"
     bl_context = "texture"
@@ -668,6 +697,7 @@ class CyclesTexture_PT_colors(CyclesButtonsPanel, Panel):
         if mapping.use_color_ramp:
             layout.template_color_ramp(mapping, "color_ramp", expand=True)
 
+
 def draw_device(self, context):
     scene = context.scene
     layout = self.layout
@@ -686,6 +716,7 @@ def draw_device(self, context):
         if cscene.device == 'CPU' and engine.with_osl():
             layout.prop(cscene, "shading_system")
 
+
 def draw_pause(self, context):
     layout = self.layout
     scene = context.scene
@@ -697,6 +728,7 @@ def draw_pause(self, context):
             cscene = scene.cycles
             layout.prop(cscene, "preview_pause", icon="PAUSE", text="")
 
+
 def get_panels():
     return [
         bpy.types.RENDER_PT_render,
@@ -752,17 +784,18 @@ def get_panels():
         bpy.types.PARTICLE_PT_vertexgroups,
         bpy.types.PARTICLE_PT_custom_props]
 
+
 def register():
     bpy.types.RENDER_PT_render.append(draw_device)
     bpy.types.VIEW3D_HT_header.append(draw_pause)
 
     for panel in get_panels():
         panel.COMPAT_ENGINES.add('CYCLES')
-    
+
+
 def unregister():
     bpy.types.RENDER_PT_render.remove(draw_device)
     bpy.types.VIEW3D_HT_header.remove(draw_pause)
 
     for panel in get_panels():
         panel.COMPAT_ENGINES.remove('CYCLES')
-
diff --git a/intern/cycles/blender/addon/xml.py b/intern/cycles/blender/addon/xml.py
index 3713da09235..e64023f046b 100644
--- a/intern/cycles/blender/addon/xml.py
+++ b/intern/cycles/blender/addon/xml.py
@@ -16,6 +16,8 @@
 # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 #
 
+# <pep8 compliant>
+
 # XML exporter for generating test files, not intended for end users
 
 import os
@@ -24,6 +26,7 @@ from bpy_extras.io_utils import ExportHelper
 import xml.etree.ElementTree as etree
 import xml.dom.minidom as dom
 
+
 def strip(root):
     root.text = None
     root.tail = None
@@ -31,6 +34,7 @@ def strip(root):
     for elem in root:
         strip(elem)
 
+
 def write(node, fname):
     strip(node)
 
@@ -40,6 +44,7 @@ def write(node, fname):
     f = open(fname, "w")
     f.write(s)
 
+
 class ExportCyclesXML(bpy.types.Operator, ExportHelper):
     ''''''
     bl_idname = "export_mesh.cycles_xml"
@@ -82,18 +87,19 @@ class ExportCyclesXML(bpy.types.Operator, ExportHelper):
             verts += " "
 
         node = etree.Element('mesh', attrib={'nverts': nverts, 'verts': verts, 'P': P})
-        
+
         # write to file
         write(node, filepath)
 
         return {'FINISHED'}
 
+
 def register():
     pass
 
+
 def unregister():
     pass
 
 if __name__ == "__main__":
     register()
-