Some minor fixes.

Cura/cura_sf/fabmetheus_utilities/settings.py

@@ -514,9 +514,9 @@ class FileNameInput(StringSetting ):
 		return self
 
 class HelpPage:
-    "A class to open a help page."
-    def getOpenFromAbsolute( self, hypertextAddress ):
-        return self
+	"A class to open a help page."
+	def getOpenFromAbsolute( self, hypertextAddress ):
+		return self
 
 class MenuButtonDisplay:
 	"A class to add a combo box selection."

Cura/cura_sf/skeinforge_application/skeinforge_plugins/craft_plugins/dimension.py

@@ -242,7 +242,7 @@ class DimensionSkein:
 					line = extra + line
 			self.oldLocation = location
 		else:
-			if self.oldLocation == None:
+			if self.oldLocation is None:
 				print('Warning: There was no absolute location when the G91 command was parsed, so the absolute location will be set to the origin.')
 				self.oldLocation = Vector3()
 			location = gcodec.getLocationFromSplitLine(None, splitLine)

Cura/gui/preview3d.py

@@ -468,6 +468,7 @@ class PreviewGLCanvas(glcanvas.GLCanvas):
 		self.oldY = 0
 		self.dragType = ''
 		self.tempRotate = 0
+		self.viewport = None
 	
 	def updateProfileToControls(self):
 		self.objColor[0] = profile.getPreferenceColour('model_colour')
@@ -478,7 +479,7 @@ class PreviewGLCanvas(glcanvas.GLCanvas):
 	def OnMouseMotion(self,e):
 		cursorXY = 100000
 		radius = 0
-		if self.parent.objectsMaxV != None:
+		if self.parent.objectsMaxV is not None and self.viewport is not None:
 			radius = self.parent.objectsBounderyCircleSize * profile.getProfileSettingFloat('model_scale')
 			
 			p0 = numpy.array(gluUnProject(e.GetX(), self.viewport[1] + self.viewport[3] - e.GetY(), 0, self.modelMatrix, self.projMatrix, self.viewport))

Cura/util/profile.py

@@ -578,8 +578,8 @@ def getPluginList():
 					elif line[0].upper() == 'DEPEND':
 						pass
 					elif line[0].upper() == 'PARAM':
-						m = re.match('([a-zA-Z]*)\(([a-zA-Z_]*)(?:\:([^\)]*))?\) +(.*)', line[1].strip())
-						if m != None:
+						m = re.match('([a-zA-Z]*)\(([a-zA-Z_]*)(?::([^\)]*))?\) +(.*)', line[1].strip())
+						if m is not None:
 							item['params'].append({'name': m.group(1), 'type': m.group(2), 'default': m.group(3), 'description': m.group(4)})
 					else:
 						print "Unknown item in effect meta data: %s %s" % (line[0], line[1])