diff --git a/src/Mod/Part/BOPTools/GeneralFuseResult.py b/src/Mod/Part/BOPTools/GeneralFuseResult.py
index 6bc4a9752ecf..38f9573f0950 100644
--- a/src/Mod/Part/BOPTools/GeneralFuseResult.py
+++ b/src/Mod/Part/BOPTools/GeneralFuseResult.py
@@ -110,12 +110,14 @@ def parse(self):
                 types.add(piece.ShapeType)
 
             types_to_extract = types.intersection(nonaggregate_types)
-            extractor = lambda(sh):(
-                    (sh.Vertexes if "Vertex" in types_to_extract else [])
-                    + (sh.Edges if "Edge" in types_to_extract else [])
-                    + (sh.Faces if "Face" in types_to_extract else [])
-                    + (sh.Solids if "Solid" in types_to_extract else [])
-                    )
+
+            def extractor(sh):
+                return (
+                    (sh.Vertexes if "Vertex" in types_to_extract else []) +
+                    (sh.Edges if "Edge" in types_to_extract else []) +
+                    (sh.Faces if "Face" in types_to_extract else []) +
+                    (sh.Solids if "Solid" in types_to_extract else [])
+                )
 
             aggregate_sources_indexes = [self.indexOfSource(sh) for sh in self.source_shapes if sh.ShapeType in aggregate_types]
             aggregate_pieces = [sh for sh in self.pieces if sh.ShapeType in aggregate_types]
@@ -298,14 +300,14 @@ def makeSplitPieces(self, shape):
         original shape."""
 
         if shape.ShapeType == "Wire":
-            bit_extractor = lambda(sh): sh.Edges
-            joint_extractor = lambda(sh): sh.Vertexes
+            bit_extractor = lambda sh: sh.Edges
+            joint_extractor = lambda sh: sh.Vertexes
         elif shape.ShapeType == "Shell":
-            bit_extractor = lambda(sh): sh.Faces
-            joint_extractor = lambda(sh): sh.Edges
+            bit_extractor = lambda sh: sh.Faces
+            joint_extractor = lambda sh: sh.Edges
         elif shape.ShapeType == "CompSolid":
-            bit_extractor = lambda(sh): sh.Solids
-            joint_extractor = lambda(sh): sh.Faces
+            bit_extractor = lambda sh: sh.Solids
+            joint_extractor = lambda sh: sh.Faces
         else:
             #can't split the shape
             return [shape]
diff --git a/src/Mod/Part/BOPTools/ShapeMerge.py b/src/Mod/Part/BOPTools/ShapeMerge.py
index dd9fa3436358..484f1440179b 100644
--- a/src/Mod/Part/BOPTools/ShapeMerge.py
+++ b/src/Mod/Part/BOPTools/ShapeMerge.py
@@ -50,9 +50,9 @@ def isConnected(shape1, shape2, shape_dim = -1):
     if shape_dim == -1:
         shape_dim = dimensionOfShapes([shape1, shape2])
     extractor = {0: None,
-                 1: (lambda(sh): sh.Vertexes),
-                 2: (lambda(sh): sh.Edges),
-                 3: (lambda(sh): sh.Faces)    }[shape_dim]
+                 1: (lambda sh: sh.Vertexes),
+                 2: (lambda sh: sh.Edges),
+                 3: (lambda sh: sh.Faces)    }[shape_dim]
     return len(findSharedElements([shape1, shape2], extractor))>0
 
 def splitIntoGroupsBySharing(list_of_shapes, element_extractor, split_connections = []):
@@ -132,7 +132,7 @@ def mergeSolids(list_of_solids_compsolids, flag_single = False, split_connection
     else:
         if len(solids)==0:
             return Part.Compound([])
-        groups = splitIntoGroupsBySharing(solids, lambda(sh): sh.Faces, split_connections)
+        groups = splitIntoGroupsBySharing(solids, lambda sh: sh.Faces, split_connections)
         if bool_compsolid:
             merged_solids = [Part.CompSolid(group) for group in groups]
         else:
@@ -146,7 +146,7 @@ def mergeShells(list_of_faces_shells, flag_single = False, split_connections = [
     if flag_single:
         return Part.makeShell(faces)
     else:
-        groups = splitIntoGroupsBySharing(faces, lambda(sh): sh.Edges, split_connections)
+        groups = splitIntoGroupsBySharing(faces, lambda sh: sh.Edges, split_connections)
         return Part.makeCompound([Part.Shell(group) for group in groups])
 
 def mergeWires(list_of_edges_wires, flag_single = False, split_connections = []):
@@ -156,7 +156,7 @@ def mergeWires(list_of_edges_wires, flag_single = False, split_connections = [])
     if flag_single:
         return Part.Wire(edges)
     else:
-        groups = splitIntoGroupsBySharing(edges, lambda(sh): sh.Vertexes, split_connections)
+        groups = splitIntoGroupsBySharing(edges, lambda sh: sh.Vertexes, split_connections)
         return Part.makeCompound([Part.Wire(Part.getSortedClusters(group)[0]) for group in groups])
 
 def mergeVertices(list_of_vertices, flag_single = False, split_connections = []):