diff --git a/src/Mod/Path/PathScripts/PathOp.py b/src/Mod/Path/PathScripts/PathOp.py
index e295ac571f..8f41e9ecd4 100644
--- a/src/Mod/Path/PathScripts/PathOp.py
+++ b/src/Mod/Path/PathScripts/PathOp.py
@@ -44,6 +44,7 @@ if False:
 else:
     PathLog.setLevel(PathLog.Level.INFO, PathLog.thisModule())
 
+
 # Qt tanslation handling
 def translate(context, text, disambig=None):
     return QtCore.QCoreApplication.translate(context, text, disambig)
@@ -63,6 +64,7 @@ FeatureLocations    = 0x1000     # Locations
 
 FeatureBaseGeometry = FeatureBaseVertexes | FeatureBaseFaces | FeatureBaseEdges | FeatureBasePanels
 
+
 class ObjectOp(object):
     '''
     Base class for proxy objects of all Path operations.
@@ -99,13 +101,13 @@ class ObjectOp(object):
     def addOpValues(self, obj, values):
         if 'start' in values:
             obj.addProperty("App::PropertyDistance", "OpStartDepth", "Op Values", QtCore.QT_TRANSLATE_NOOP("PathOp", "Holds the calculated value for the StartDepth"))
-            obj.setEditorMode('OpStartDepth', 1) # read-only
+            obj.setEditorMode('OpStartDepth', 1)  # read-only
         if 'final' in values:
             obj.addProperty("App::PropertyDistance", "OpFinalDepth", "Op Values", QtCore.QT_TRANSLATE_NOOP("PathOp", "Holds the calculated value for the FinalDepth"))
-            obj.setEditorMode('OpFinalDepth', 1) # read-only
+            obj.setEditorMode('OpFinalDepth', 1)  # read-only
         if 'tooldia' in values:
             obj.addProperty("App::PropertyDistance", "OpToolDiameter", "Op Values", QtCore.QT_TRANSLATE_NOOP("PathOp", "Holds the diameter of the tool"))
-            obj.setEditorMode('OpToolDiameter', 1) # read-only
+            obj.setEditorMode('OpToolDiameter', 1)  # read-only
 
     def __init__(self, obj):
         PathLog.track()
@@ -130,12 +132,12 @@ class ObjectOp(object):
             obj.addProperty("App::PropertyDistance", "StartDepth", "Depth", QtCore.QT_TRANSLATE_NOOP("PathOp", "Starting Depth of Tool- first cut depth in Z"))
             obj.addProperty("App::PropertyDistance", "FinalDepth", "Depth", QtCore.QT_TRANSLATE_NOOP("PathOp", "Final Depth of Tool- lowest value in Z"))
             if FeatureNoFinalDepth & features:
-                obj.setEditorMode('FinalDepth', 2) # hide
+                obj.setEditorMode('FinalDepth', 2)  # hide
             self.addOpValues(obj, ['start', 'final'])
         else:
             # StartDepth has become necessary for expressions on other properties
             obj.addProperty("App::PropertyDistance", "StartDepth", "Depth", QtCore.QT_TRANSLATE_NOOP("PathOp", "Starting Depth internal use only for derived values"))
-            obj.setEditorMode('StartDepth', 1) # read-only
+            obj.setEditorMode('StartDepth', 1)  # read-only
 
         if FeatureStepDown & features:
             obj.addProperty("App::PropertyDistance", "StepDown", "Depth", QtCore.QT_TRANSLATE_NOOP("PathOp", "Incremental Step Down of Tool"))
@@ -215,7 +217,7 @@ class ObjectOp(object):
         '''opUpdateDepths(obj) ... overwrite to implement special depths calculation.
         Can safely be overwritten by subclass.'''
         pass
-     
+
     def opExecute(self, obj):
         '''opExecute(obj) ... called whenever the receiver needs to be recalculated.
         See documentation of execute() for a list of base functionality provided.
@@ -256,17 +258,17 @@ class ObjectOp(object):
             obj.ToolController = PathUtils.findToolController(obj)
             if not obj.ToolController:
                 return False
-            obj.OpToolDiameter  =  obj.ToolController.Tool.Diameter
+            obj.OpToolDiameter = obj.ToolController.Tool.Diameter
 
         if FeatureDepths & features:
             if self.applyExpression(obj, 'StartDepth', job.SetupSheet.StartDepthExpression):
-                obj.OpStartDepth =  1.0
+                obj.OpStartDepth = 1.0
             else:
-                obj.StartDepth   =  1.0
+                obj.StartDepth = 1.0
             if self.applyExpression(obj, 'FinalDepth', job.SetupSheet.FinalDepthExpression):
-                obj.OpFinalDepth =  0.0
+                obj.OpFinalDepth = 0.0
             else:
-                obj.FinalDepth   =  0.0
+                obj.FinalDepth = 0.0
         else:
             obj.StartDepth = 1.0
 
@@ -318,11 +320,11 @@ class ObjectOp(object):
         def faceZmin(bb, fbb):
             if fbb.ZMax == fbb.ZMin and fbb.ZMax == bb.ZMax:  # top face
                 return fbb.ZMin
-            elif fbb.ZMax > fbb.ZMin and fbb.ZMax == bb.ZMax: # vertical face, full cut
+            elif fbb.ZMax > fbb.ZMin and fbb.ZMax == bb.ZMax:  # vertical face, full cut
                 return fbb.ZMin
             elif fbb.ZMax > fbb.ZMin and fbb.ZMin > bb.ZMin:  # internal vertical wall
                 return fbb.ZMin
-            elif fbb.ZMax == fbb.ZMin and fbb.ZMax > bb.ZMin: # face/shelf
+            elif fbb.ZMax == fbb.ZMin and fbb.ZMax > bb.ZMin:  # face/shelf
                 return fbb.ZMin
             return bb.ZMin
 
@@ -464,4 +466,3 @@ class ObjectOp(object):
                 obj.Base = baselist
             else:
                 PathLog.notice((translate("Path", "Base object %s.%s rejected by operation")+"\n") % (base.Label, sub))
-