Cleanup: identity for None comparison

21 files changed, 81 insertions, 81 deletions

diff --git a/add_curve_extra_objects/add_curve_simple.py b/add_curve_extra_objects/add_curve_simple.py
index 111d8c08..a17e544a 100644
--- a/add_curve_extra_objects/add_curve_simple.py
+++ b/add_curve_extra_objects/add_curve_simple.py
@@ -1028,7 +1028,7 @@ class Simple(bpy.types.Operator):
     ##### POLL #####
     @classmethod
     def poll(cls, context):
-        return context.scene != None
+        return context.scene is not None
 
     ##### EXECUTE #####
     def execute(self, context):
@@ -1099,7 +1099,7 @@ class BezierPointsFillet(bpy.types.Operator):
     ##### POLL #####
     @classmethod
     def poll(cls, context):
-        return context.scene != None
+        return context.scene is not None
 
     ##### EXECUTE #####
     def execute(self, context):
@@ -1237,7 +1237,7 @@ class BezierDivide(bpy.types.Operator):
     ##### POLL #####
     @classmethod
     def poll(cls, context):
-        return context.scene != None
+        return context.scene is not None
 
     ##### EXECUTE #####
     def execute(self, context):
@@ -1347,7 +1347,7 @@ class SimpleEdit(bpy.types.Operator):
         nselected = []
         n = 0
         obj = context.active_object
-        if obj != None:
+        if obj is not None:
             if obj.type == 'CURVE':
                 for i in obj.data.splines:
                     for j in i.bezier_points:
@@ -1375,7 +1375,7 @@ class SimpleEdit(bpy.types.Operator):
         selected = []
         n = 0
         obj = context.active_object
-        if obj != None:
+        if obj is not None:
             if obj.type == 'CURVE':
                 for i in obj.data.splines:
                     for j in i.bezier_points:
diff --git a/add_mesh_BoltFactory/Boltfactory.py b/add_mesh_BoltFactory/Boltfactory.py
index 66b0c32f..be0ba617 100644
--- a/add_mesh_BoltFactory/Boltfactory.py
+++ b/add_mesh_BoltFactory/Boltfactory.py
@@ -266,7 +266,7 @@ class add_mesh_bolt(bpy.types.Operator):
     ##### POLL #####
     @classmethod
     def poll(cls, context):
-        return context.scene != None
+        return context.scene is not None
 
     ##### EXECUTE #####
     def execute(self, context):
diff --git a/animation_add_corrective_shape_key.py b/animation_add_corrective_shape_key.py
index 66234f94..efb357f8 100644
--- a/animation_add_corrective_shape_key.py
+++ b/animation_add_corrective_shape_key.py
@@ -181,7 +181,7 @@ class add_corrective_pose_shape(bpy.types.Operator):
 
     @classmethod
     def poll(cls, context):
-        return context.active_object != None
+        return context.active_object is not None
 
     def execute(self, context):
         selection = context.selected_objects
@@ -378,7 +378,7 @@ class add_corrective_pose_shape_fast(bpy.types.Operator):
 
     @classmethod
     def poll(cls, context):
-        return context.active_object != None
+        return context.active_object is not None
 
     def execute(self, context):
         selection = context.selected_objects
diff --git a/io_convert_image_to_mesh_img/import_img.py b/io_convert_image_to_mesh_img/import_img.py
index 303991dc..7c9e76d1 100644
--- a/io_convert_image_to_mesh_img/import_img.py
+++ b/io_convert_image_to_mesh_img/import_img.py
@@ -67,7 +67,7 @@ class hirise_dtm_importer(object):
       self.__cropXY = False
 
     def bin_mode(self, bin_mode=None):
-      if bin_mode != None:
+      if bin_mode is not None:
         self.__bin_mode = bin_mode
       return self.__bin_mode
 
@@ -503,7 +503,7 @@ class hirise_dtm_importer(object):
       x = 0
       point_offset += len( last_line ) - last_line.count(None)
       for z in last_line:
-        if z != None:
+        if z is not None:
           coords.append( (x*scale_x, 0.0, z) )
           coord += 1
         x += 1
@@ -535,7 +535,7 @@ class hirise_dtm_importer(object):
         # TODO: turn this into a map
         x = 0
         for z in dtm_line:
-          if z != None:
+          if z is not None:
             coords.append( (x*scale_x, y_val, z) )
             coord += 1
           x += 1
@@ -567,17 +567,17 @@ class hirise_dtm_importer(object):
             # TODO: implement a triangular face
             pass
 
-          if vals[1] != None:
+          if vals[1] is not None:
             previous_point_offset += 1
-          if vals[2] != None:
+          if vals[2] is not None:
             point_offset += 1
 
         # Squeeze the last point offset increment out of the previous line
-        if last_line[-1] != None:
+        if last_line[-1] is not None:
           previous_point_offset += 1
 
         # Squeeze the last point out of the current line
-        if dtm_line[-1] != None:
+        if dtm_line[-1] is not None:
           point_offset += 1
 
         # remember what we just saw (and forget anything before that)
diff --git a/io_export_dxf/export_dxf.py b/io_export_dxf/export_dxf.py
index 89aa1d1c..a17f50f2 100644
--- a/io_export_dxf/export_dxf.py
+++ b/io_export_dxf/export_dxf.py
@@ -204,7 +204,7 @@ def get_view_projection_matrix(context, settings):
 	Currently only orthographic projection is used. (Subject to discussion).
 	"""
 	cam = settings['projectionThrough']
-	if cam == None:
+	if cam is None:
 		mw = mathutils.Matrix()
 		mw.identity()
 	elif cam in projectionMapping.keys():
@@ -238,8 +238,8 @@ def _exportItem(ctx, o, mw, drawing, settings):
 		print('elayer=%s, ecolor=%s, eltype=%s' % (elayer, ecolor, eltype))
 	#TODO: use o.boundBox for drawing extends ??
 
-	if elayer != None and not drawing.containsLayer(elayer):
-		if ecolor!=None: tempcolor = ecolor
+	if elayer is not None and not drawing.containsLayer(elayer):
+		if ecolor is not None: tempcolor = ecolor
 		else: tempcolor = settings['layercolor_def']
 		drawing.addLayer(elayer, tempcolor)
 
diff --git a/io_export_dxf/primitive_exporters/base_exporter.py b/io_export_dxf/primitive_exporters/base_exporter.py
index 2542a1c0..d3c9663d 100644
--- a/io_export_dxf/primitive_exporters/base_exporter.py
+++ b/io_export_dxf/primitive_exporters/base_exporter.py
@@ -181,7 +181,7 @@ class BasePrimitiveDXFExporter(object):
 #        #print 'deb: OCS_origin=', OCS_origin #---------
 #
 #        ZRotation = rotZ
-#        if Extrusion!=None:
+#        if Extrusion is not None:
 #            ZRotation = getZRotation(AXaxis,rot_matrix_invert)
 #        #Zrotmatrix = mathutils.RotationMatrix(-ZRotation, 3, "Z")
 #        rs, rc = sin(ZRotation), cos(ZRotation)
diff --git a/io_export_unreal_psk_psa.py b/io_export_unreal_psk_psa.py
index c410f91c..7ecef29b 100644
--- a/io_export_unreal_psk_psa.py
+++ b/io_export_unreal_psk_psa.py
@@ -770,7 +770,7 @@ class SmoothingGroup:
     def get_valid_smoothgroup_id(self):
         temp_id = 1
         for group in self.neighboring_groups:
-            if group != None and group.id == temp_id:
+            if group is not None and group.id == temp_id:
                 if temp_id < 0x80000000:
                     temp_id = temp_id << 1
                 else:
@@ -828,7 +828,7 @@ def add_face_to_smoothgroup( mesh, face, edge_sharing_list, smoothgroup ):
 
         edge_id = find_edges(mesh, key)
 
-        if edge_id != None:
+        if edge_id is not None:
 
             # not sharp
             if not( mesh.edges[edge_id].use_edge_sharp):
@@ -946,7 +946,7 @@ def meshmerge(selectedobjects):
         count = 0 #reset count
         for count in range(len( selectedobjects)):
             #print("Index:",count)
-            if selectedobjects[count] != None:
+            if selectedobjects[count] is not None:
                 me_da = selectedobjects[count].data.copy() #copy data
                 me_ob = selectedobjects[count].copy() #copy object
                 #note two copy two types else it will use the current data or mesh
@@ -1016,8 +1016,8 @@ def parse_mesh( mesh, psk ):
 
         print("  Material {} '{}'".format(mat_slot_index, slot.name))
         MaterialName.append(slot.name)
-        #if slot.material.texture_slots[0] != None:
-            #if slot.material.texture_slots[0].texture.image.filepath != None:
+        #if slot.material.texture_slots[0] is not None:
+            #if slot.material.texture_slots[0].texture.image.filepath is not None:
                 #print("    Texture path {}".format(slot.material.texture_slots[0].texture.image.filepath))
         #create the current material
         v_material              = psk.GetMatByIndex(mat_slot_index)
@@ -1314,7 +1314,7 @@ def parse_armature( armature, psk, psa ):
     verbose("Armature object: {} Armature data: {}".format(armature.name, armature.data.name))
 
     # generate a list of root bone candidates
-    root_candidates = [b for b in armature.data.bones if b.parent == None and b.use_deform == True]
+    root_candidates = [b for b in armature.data.bones if b.parent is None and b.use_deform == True]
 
     # should be a single, unambiguous result
     if len(root_candidates) == 0:
@@ -1360,7 +1360,7 @@ def recurse_bone( bone, bones, psk, psa, parent_id, parent_matrix, indent="" ):
         status = "No effect"
 
     # calc parented bone transform
-    if bone.parent != None:
+    if bone.parent is not None:
         quat        = make_fquat(bone.matrix.to_quaternion())
         quat_parent = bone.parent.matrix.to_quaternion().inverted()
         parent_head = quat_parent * bone.parent.head
@@ -1431,7 +1431,7 @@ def parse_animation( armature, udk_bones, actions_to_export, psa ):
     print("Scene: {} FPS: {} Frames: {} to {}".format(context.scene.name, anim_rate, context.scene.frame_start, context.scene.frame_end))
     print("Processing {} action(s)".format(len(actions_to_export)))
     print()
-    if armature.animation_data == None: #if animation data was not create for the armature it will skip the exporting action set(s)
+    if armature.animation_data is None: #if animation data was not create for the armature it will skip the exporting action set(s)
         print("None Actions Set! skipping...")
         return
     restoreAction   = armature.animation_data.action    # Q: is animation_data always valid?
@@ -1505,14 +1505,14 @@ def parse_animation( armature, udk_bones, actions_to_export, psa ):
                 pose_bone           = bone_data[1]
                 pose_bone_matrix    = mathutils.Matrix(pose_bone.matrix)
 
-                if pose_bone.parent != None:
+                if pose_bone.parent is not None:
                     pose_bone_parent_matrix = mathutils.Matrix(pose_bone.parent.matrix)
                     pose_bone_matrix        = pose_bone_parent_matrix.inverted() * pose_bone_matrix
 
                 head                = pose_bone_matrix.to_translation()
                 quat                = pose_bone_matrix.to_quaternion().normalized()
 
-                if pose_bone.parent != None:
+                if pose_bone.parent is not None:
                     quat = make_fquat(quat)
                 else:
                     quat = make_fquat_default(quat)
@@ -1702,7 +1702,7 @@ def find_armature_and_mesh():
                 raise Error("No mesh parented to armature")
 
         verbose("Found mesh: {}".format(mesh.name))
-    if mesh == None or armature == None:
+    if mesh is None or armature is None:
         raise Error("Check Mesh and Armature are list!")
     #if len(armature.pose.bones) == len(mesh.vertex_groups):
         #print("Armature and Mesh Vertex Groups matches Ok!")
@@ -2049,7 +2049,7 @@ def rebuildmesh(obj):
     uv_layer = mmesh.tessface_uv_textures.active
     for face in mmesh.tessfaces:
         smoothings.append(face.use_smooth)#smooth or flat in boolean
-        if uv_layer != None:#check if there texture data exist
+        if uv_layer is not None:#check if there texture data exist
             faceUV = uv_layer.data[face.index]
             uvs = []
             for uv in faceUV.uv:
@@ -2159,7 +2159,7 @@ def rebuildarmature(obj):
 
     bpy.ops.object.mode_set(mode='EDIT')
     for bone in obj.data.edit_bones:
-        if bone.parent != None:
+        if bone.parent is not None:
             currentbone.append([bone.name,bone.roll])
         else:
             currentbone.append([bone.name,bone.roll])
@@ -2177,12 +2177,12 @@ def rebuildarmature(obj):
             if bone.name == bonelist[0]:
                 newbone.roll = bonelist[1]
                 break
-        if bone.parent != None:
+        if bone.parent is not None:
             parentbone = ob_new.data.edit_bones[bone.parent.name]
             newbone.parent = parentbone
 
     ob_new.animation_data_create()#create animation data
-    if obj.animation_data != None:#check for animation
+    if obj.animation_data is not None:#check for animation
         ob_new.animation_data.action  = obj.animation_data.action  #just make sure it here to do the animations if exist
     print("Armature Object Name:",ob_new.name)
     return ob_new
@@ -2440,7 +2440,7 @@ def udkcheckmeshline():
     bpy.ops.mesh.select_all(action='DESELECT')
     bpy.context.tool_settings.mesh_select_mode = (True, False, False) #select vertices
 
-    if objmesh != None:
+    if objmesh is not None:
         print("found mesh")
         print(objmesh)
         print(objmesh.data.tessfaces)
@@ -2533,7 +2533,7 @@ class OBJECT_OT_ActionSetAnimUpdate(bpy.types.Operator):
         if len(armatureselected) == 1:
             armature = armatureselected[0]
 
-        if armature != None:
+        if armature is not None:
             for bone in armature.pose.bones:
                 bones.append(bone.name)
 
@@ -2617,7 +2617,7 @@ class ExportUDKAnimData(bpy.types.Operator):
 
     @classmethod
     def poll(cls, context):
-        return context.active_object != None
+        return context.active_object is not None
 
     def execute(self, context):
         scene = bpy.context.scene
diff --git a/io_import_dxf/dxfimport/do.py b/io_import_dxf/dxfimport/do.py
index 66551f53..3f80c3a1 100644
--- a/io_import_dxf/dxfimport/do.py
+++ b/io_import_dxf/dxfimport/do.py
@@ -360,7 +360,7 @@ class Do:
         if len(spline) % 3 != 1:
             print("DXF-IMPORT: DO ARC: CHECK PLEASE: ", len(spline), spline)
 
-        # curve == None means arc is called from bulge conversion
+        # curve is None means arc is called from bulge conversion
         # nothing should be projected at this stage, since the
         # lwpolyline (the only entity with bulges) will be projected
         # as a whole afterwards (small little error; took ages to debug)
diff --git a/io_import_scene_lwo.py b/io_import_scene_lwo.py
index b7e10225..8f1bbbac 100644
--- a/io_import_scene_lwo.py
+++ b/io_import_scene_lwo.py
@@ -971,7 +971,7 @@ def build_armature(layer_data, bones):
         else:
             nb.roll= 0.0
 
-        if prev_bone != None:
+        if prev_bone is not None:
             if nb.head == prev_bone.tail:
                 nb.parent= prev_bone
 
diff --git a/io_import_scene_unreal_psa_psk.py b/io_import_scene_unreal_psa_psk.py
index 4eaa8a72..c210b771 100644
--- a/io_import_scene_unreal_psa_psk.py
+++ b/io_import_scene_unreal_psa_psk.py
@@ -594,7 +594,7 @@ def pskimport(infile,importmesh,importbone,bDebugLogPSK,importmultiuvtextures):
     materials = []
 
     for matcount in range(materialcount):
-        #if texturedata != None:
+        #if texturedata is not None:
         matdata = bpy.data.materials.new(materialname + str(matcount))
         #mtex = matdata.texture_slots.new()
         #mtex.texture = texture[matcount].data
@@ -946,7 +946,7 @@ def psaimport(filename,context):
         _psa_bone = psa_bone()
         _psa_bone.name = bone.name
         _psa_bone.Transform = bone.matrix
-        if bone.parent != None:
+        if bone.parent is not None:
             _psa_bone.parent = psa_bones[bone.parent.name]
         else:
             _psa_bone.parent = None
@@ -975,7 +975,7 @@ def psaimport(filename,context):
                     quat = Raw_Key_List[raw_key_index][1]
 
                     mat = Matrix()
-                    if pbone.parent != None:
+                    if pbone.parent is not None:
                         quat = quat.conjugated()
                         mat = Matrix.Translation(pos) * quat.to_matrix().to_4x4()
                         mat = pose_bones[bName].parent.matrix * mat
@@ -1025,7 +1025,7 @@ def psaimport(filename,context):
                     child.keyframe_insert("rotation_quaternion")
 
             for bone in pose_bones:
-                if bone.parent != None:
+                if bone.parent is not None:
                     whirlSingleBone(bone,Quaternion((0.707, 0, 0, -0.707)))
                 else:
                     bone.rotation_quaternion *= Quaternion((0.707, -0.707, 0, 0)) * Quaternion((0.707, 0, 0, -0.707))
diff --git a/io_mesh_ply/__init__.py b/io_mesh_ply/__init__.py
index 7e2a7037..3e84a4fd 100644
--- a/io_mesh_ply/__init__.py
+++ b/io_mesh_ply/__init__.py
@@ -134,7 +134,7 @@ class ExportPLY(bpy.types.Operator, ExportHelper, IOPLYOrientationHelper):
 
     @classmethod
     def poll(cls, context):
-        return context.active_object != None
+        return context.active_object is not None
 
     def execute(self, context):
         from . import export_ply
diff --git a/io_scene_x/export_x.py b/io_scene_x/export_x.py
index 64f5ff83..3ecc27e2 100644
--- a/io_scene_x/export_x.py
+++ b/io_scene_x/export_x.py
@@ -746,7 +746,7 @@ class MeshExportObject(ExportObject):
 
         def GetMaterialKey(Material, UVTexture, Index):
             Image = None
-            if UVTexture != None and UVTexture.data[Index].image != None:
+            if UVTexture is not None and UVTexture.data[Index].image is not None:
                 Image = UVTexture.data[Index].image if \
                     UVTexture.data[Index].image.source == 'FILE' else None
 
diff --git a/io_scene_x3d/import_x3d.py b/io_scene_x3d/import_x3d.py
index 269cc557..3416bf22 100644
--- a/io_scene_x3d/import_x3d.py
+++ b/io_scene_x3d/import_x3d.py
@@ -428,25 +428,25 @@ class vrmlNode(object):
     # Only available from the root node
     '''
     def getFieldDict(self):
-        if self.FIELD_NAMESPACE != None:
+        if self.FIELD_NAMESPACE is not None:
             return self.FIELD_NAMESPACE
         else:
             return self.parent.getFieldDict()
     '''
     def getProtoDict(self):
-        if self.PROTO_NAMESPACE != None:
+        if self.PROTO_NAMESPACE is not None:
             return self.PROTO_NAMESPACE
         else:
             return self.parent.getProtoDict()
 
     def getDefDict(self):
-        if self.DEF_NAMESPACE != None:
+        if self.DEF_NAMESPACE is not None:
             return self.DEF_NAMESPACE
         else:
             return self.parent.getDefDict()
 
     def getRouteIpoDict(self):
-        if self.ROUTE_IPO_NAMESPACE != None:
+        if self.ROUTE_IPO_NAMESPACE is not None:
             return self.ROUTE_IPO_NAMESPACE
         else:
             return self.parent.getRouteIpoDict()
@@ -1107,7 +1107,7 @@ class vrmlNode(object):
 
             # fill in DEF/USE
             key = self.getDefName()
-            if key != None:
+            if key is not None:
                 self.getDefDict()[key] = self
 
             key = self.getProtoName()
@@ -1115,7 +1115,7 @@ class vrmlNode(object):
                 key = self.getExternprotoName()
 
             proto_dict = self.getProtoDict()
-            if key != None:
+            if key is not None:
                 proto_dict[key] = self
 
                 # Parse the proto nodes fields
@@ -3370,7 +3370,7 @@ def translateTimeSensor(node, action, ancestry):
     startTime = node.getFieldAsFloat('startTime', 0.0, ancestry)
     stopTime = node.getFieldAsFloat('stopTime', 250.0, ancestry)
 
-    if cycleInterval != None:
+    if cycleInterval is not None:
         stopTime = startTime + cycleInterval
 
     loop = node.getFieldAsBool('loop', False, ancestry)
diff --git a/mesh_bsurfaces.py b/mesh_bsurfaces.py
index b90617b0..21c6e50e 100644
--- a/mesh_bsurfaces.py
+++ b/mesh_bsurfaces.py
@@ -249,7 +249,7 @@ class GPENCIL_OT_SURFSK_add_surface(bpy.types.Operator):
     def get_ordered_verts(self, ob, all_selected_edges_idx, all_selected_verts_idx, first_vert_idx, middle_vertex_idx, closing_vert_idx):
         # Order selected vertices.
         verts_ordered = []
-        if closing_vert_idx != None:
+        if closing_vert_idx is not None:
             verts_ordered.append(ob.data.vertices[closing_vert_idx])
 
         verts_ordered.append(ob.data.vertices[first_vert_idx])
@@ -276,10 +276,10 @@ class GPENCIL_OT_SURFSK_add_surface(bpy.types.Operator):
             if finish_while:
                 break
 
-        if closing_vert_idx != None:
+        if closing_vert_idx is not None:
             verts_ordered.append(ob.data.vertices[closing_vert_idx])
 
-        if middle_vertex_idx != None:
+        if middle_vertex_idx is not None:
             verts_ordered.append(ob.data.vertices[middle_vertex_idx])
             verts_ordered.reverse()
 
@@ -686,13 +686,13 @@ class GPENCIL_OT_SURFSK_add_surface(bpy.types.Operator):
 
                 length = (v1.co - v2.co).length
 
-                if shortest_edge_length == None:
+                if shortest_edge_length is None:
                     shortest_edge_length = length
                 else:
                     if length < shortest_edge_length:
                         shortest_edge_length = length
 
-        if shortest_edge_length != None:
+        if shortest_edge_length is not None:
             edges_merge_distance = shortest_edge_length * 0.5
         else:
             edges_merge_distance = 0
@@ -764,7 +764,7 @@ class GPENCIL_OT_SURFSK_add_surface(bpy.types.Operator):
                         for vcf_idx in verts_not_movable:
                                 dist = abs((object.data.vertices[vcf_idx].co - mathutils.Vector(middle_point_co)).length)
 
-                                if shortest_dist == None:
+                                if shortest_dist is None:
                                     shortest_dist = dist
                                     nearest_vert_idx = vcf_idx
                                 else:
@@ -1130,7 +1130,7 @@ class GPENCIL_OT_SURFSK_add_surface(bpy.types.Operator):
                         if co_1 != co_2:
                             dist = (mathutils.Vector(co_1) - mathutils.Vector(co_2)).length
 
-                            if shortest_dist != None:
+                            if shortest_dist is not None:
                                 if dist < shortest_dist:
                                     shortest_dist = dist
                             else:
@@ -1279,7 +1279,7 @@ class GPENCIL_OT_SURFSK_add_surface(bpy.types.Operator):
 
                                     intersec_coords = mathutils.geometry.intersect_line_line(bp1_co, bp2_co, bp3_co, bp4_co)
 
-                                    if intersec_coords != None:
+                                    if intersec_coords is not None:
                                         dist = (intersec_coords[0] - intersec_coords[1]).length
 
                                         if dist <= self.crosshatch_merge_distance * 1.5:
@@ -1385,7 +1385,7 @@ class GPENCIL_OT_SURFSK_add_surface(bpy.types.Operator):
                     if i != t and not t in checked_verts:
                         dist = (verts[i].co - verts[t].co).length
 
-                        if shortest_dist != None:
+                        if shortest_dist is not None:
                             if dist < shortest_dist:
                                 shortest_dist = dist
                                 nearest_vert = t
@@ -1815,7 +1815,7 @@ class GPENCIL_OT_SURFSK_add_surface(bpy.types.Operator):
 
 
         #### Identify the type of selection made by the user.
-        if middle_vertex_idx != None:
+        if middle_vertex_idx is not None:
             if len(all_chains_tips_idx) == 4 and len(single_unselected_verts_and_neighbors) == 1: # If there are 4 tips (two selection chains), and there is only one single unselected vert (the middle vert).
                 selection_type = "TWO_CONNECTED"
             else:
diff --git a/netrender/master.py b/netrender/master.py
index 456e436d..81e62dbb 100644
--- a/netrender/master.py
+++ b/netrender/master.py
@@ -39,7 +39,7 @@ class MRenderFile(netrender.model.RenderFile):
     def updateStatus(self):
         self.found = os.path.exists(self.filepath)
 
-        if self.found and self.signature != None:
+        if self.found and self.signature is not None:
             found_signature = hashFile(self.filepath)
             self.found = self.signature == found_signature
             if not self.found:
diff --git a/netrender/slave.py b/netrender/slave.py
index a5d97172..3bb1578a 100644
--- a/netrender/slave.py
+++ b/netrender/slave.py
@@ -69,7 +69,7 @@ def testFile(conn, job_id, slave_id, rfile, job_prefix, main_path=None):
 
     found = os.path.exists(job_full_path)
 
-    if found and rfile.signature != None:
+    if found and rfile.signature is not None:
         found_signature = hashFile(job_full_path)
         found = found_signature == rfile.signature
 
diff --git a/object_cloud_gen.py b/object_cloud_gen.py
index 0c2817da..cac4cd5d 100644
--- a/object_cloud_gen.py
+++ b/object_cloud_gen.py
@@ -424,7 +424,7 @@ def getActionToDo(obj):
     elif obj is None:
         return 'NO_SELECTION_DO_NOTHING'
     elif "CloudMember" in obj:
-        if obj["CloudMember"] != None:
+        if obj["CloudMember"] is not None:
             if obj["CloudMember"] == "MainObj":
                 return 'DEGENERATE'
             elif obj["CloudMember"] == "CreatedObj" and len(obj.particle_systems) > 0:
diff --git a/render_copy_settings/operator.py b/render_copy_settings/operator.py
index f231ac92..4f4c9954 100644
--- a/render_copy_settings/operator.py
+++ b/render_copy_settings/operator.py
@@ -54,7 +54,7 @@ class RenderCopySettingsPrepare(bpy.types.Operator):
 
     @classmethod
     def poll(cls, context):
-        return context.scene != None
+        return context.scene is not None
 
     def execute(self, context):
         cp_sett = context.scene.render_copy_settings
@@ -144,7 +144,7 @@ class RenderCopySettingsPreset(bpy.types.Operator):
 
     @classmethod
     def poll(cls, context):
-        return context.scene != None
+        return context.scene is not None
 
     def execute(self, context):
         cp_sett = context.scene.render_copy_settings
@@ -179,7 +179,7 @@ class RenderCopySettings(bpy.types.Operator):
 
     @classmethod
     def poll(cls, context):
-        return context.scene != None
+        return context.scene is not None
 
     def execute(self, context):
         regex = None
diff --git a/render_povray/nodes.py b/render_povray/nodes.py
index bf6df14a..e6ba843d 100644
--- a/render_povray/nodes.py
+++ b/render_povray/nodes.py
@@ -54,7 +54,7 @@ class ObjectNodeTree(bpy.types.NodeTree):
         ob = context.active_object
         if ob and ob.type not in {'LAMP'}:
             ma = ob.active_material
-            if ma != None:
+            if ma is not None:
                 nt_name = ma.node_tree
                 if nt_name != '':
                     return nt_name, ma, ma
@@ -516,7 +516,7 @@ class PovrayColorImageNode(Node, ObjectNodeTree):
         split = column.split(percentage=0.8,align=True)
         split.prop_search(self,"image",context.blend_data,"images",text="")
         split.operator("pov.imageopen",text="",icon="FILESEL")
-        if im != None:
+        if im is not None:
             column.prop(im,"source",text="")
         column.prop(self,"map_type",text="")
         column.prop(self,"interpolate",text="")
@@ -534,7 +534,7 @@ class PovrayColorImageNode(Node, ObjectNodeTree):
         split = column.split(percentage=0.8,align=True)
         split.prop_search(self,"image",context.blend_data,"images",text="")
         split.operator("pov.imageopen",text="",icon="FILESEL")
-        if im != None:
+        if im is not None:
             column.prop(im,"source",text="")
         column.prop(self,"map_type",text="")
         column.prop(self,"interpolate",text="")
@@ -592,7 +592,7 @@ class PovrayBumpMapNode(Node, ObjectNodeTree):
         split = column.split(percentage=0.8,align=True)
         split.prop_search(self,"image",context.blend_data,"images",text="")
         split.operator("pov.imageopen",text="",icon="FILESEL")
-        if im != None:
+        if im is not None:
             column.prop(im,"source",text="")
         column.prop(self,"map_type",text="")
         column.prop(self,"interpolate",text="")
@@ -608,7 +608,7 @@ class PovrayBumpMapNode(Node, ObjectNodeTree):
         split = column.split(percentage=0.8,align=True)
         split.prop_search(self,"image",context.blend_data,"images",text="")
         split.operator("pov.imageopen",text="",icon="FILESEL")
-        if im != None:
+        if im is not None:
             column.prop(im,"source",text="")
         column.prop(self,"map_type",text="")
         column.prop(self,"interpolate",text="")
@@ -659,7 +659,7 @@ class PovrayImagePatternNode(Node, ObjectNodeTree):
         split = column.split(percentage=0.8,align=True)
         split.prop_search(self,"image",context.blend_data,"images",text="")
         split.operator("pov.imageopen",text="",icon="FILESEL")
-        if im != None:
+        if im is not None:
             column.prop(im,"source",text="")
         column.prop(self,"map_type",text="")
         column.prop(self,"interpolate",text="")
@@ -678,7 +678,7 @@ class PovrayImagePatternNode(Node, ObjectNodeTree):
         split = column.split(percentage=0.8,align=True)
         split.prop_search(self,"image",context.blend_data,"images",text="")
         split.operator("pov.imageopen",text="",icon="FILESEL")
-        if im != None:
+        if im is not None:
             column.prop(im,"source",text="")
         column.prop(self,"map_type",text="")
         column.prop(self,"interpolate",text="")
diff --git a/rigify/rig_ui_pitchipoy_template.py b/rigify/rig_ui_pitchipoy_template.py
index 5817f9c5..0c9dc1bd 100755
--- a/rigify/rig_ui_pitchipoy_template.py
+++ b/rigify/rig_ui_pitchipoy_template.py
@@ -538,7 +538,7 @@ class Rigify_Arm_FK2IK(bpy.types.Operator):
 
     @classmethod
     def poll(cls, context):
-        return (context.active_object != None and context.mode == 'POSE')
+        return (context.active_object is not None and context.mode == 'POSE')
 
     def execute(self, context):
         use_global_undo = context.user_preferences.edit.use_global_undo
@@ -568,7 +568,7 @@ class Rigify_Arm_IK2FK(bpy.types.Operator):
 
     @classmethod
     def poll(cls, context):
-        return (context.active_object != None and context.mode == 'POSE')
+        return (context.active_object is not None and context.mode == 'POSE')
 
     def execute(self, context):
         use_global_undo = context.user_preferences.edit.use_global_undo
@@ -599,7 +599,7 @@ class Rigify_Leg_FK2IK(bpy.types.Operator):
 
     @classmethod
     def poll(cls, context):
-        return (context.active_object != None and context.mode == 'POSE')
+        return (context.active_object is not None and context.mode == 'POSE')
 
     def execute(self, context):
         use_global_undo = context.user_preferences.edit.use_global_undo
@@ -632,7 +632,7 @@ class Rigify_Leg_IK2FK(bpy.types.Operator):
 
     @classmethod
     def poll(cls, context):
-        return (context.active_object != None and context.mode == 'POSE')
+        return (context.active_object is not None and context.mode == 'POSE')
 
     def execute(self, context):
         use_global_undo = context.user_preferences.edit.use_global_undo
diff --git a/ui_translate/update_ui.py b/ui_translate/update_ui.py
index c42bcddd..2dd35839 100644
--- a/ui_translate/update_ui.py
+++ b/ui_translate/update_ui.py
@@ -151,7 +151,7 @@ class UI_OT_i18n_updatetranslation_svn_init_settings(bpy.types.Operator):
 
     @classmethod
     def poll(cls, context):
-        return context.window_manager != None
+        return context.window_manager is not None
 
     def execute(self, context):
         if not hasattr(self, "settings"):
@@ -211,7 +211,7 @@ class UI_OT_i18n_updatetranslation_svn_settings_select(bpy.types.Operator):
 
     @classmethod
     def poll(cls, context):
-        return context.window_manager != None
+        return context.window_manager is not None
 
     def execute(self, context):
         if self.use_invert: