Small stylistic fixes to mobject.py

mobject/mobject.py

@@ -139,7 +139,7 @@ class Mobject(Container):
             self.target = self.copy()
         return self.target
 
-    #### Transforming operations ######
+    # Transforming operations
 
     def apply_to_family(self, func):
         for mob in self.family_members_with_points():
@@ -249,7 +249,7 @@ class Mobject(Container):
             mob.apply_over_attr_arrays(repeat_array)
         return self
 
-    #### In place operations ######
+    # In place operations.
     # Note, much of these are now redundant with default behavior of
     # above methods
 
@@ -278,7 +278,7 @@ class Mobject(Container):
         self.rotate(TAU / 14, RIGHT + UP, **kwargs)
         return self
 
-    #### Positioning methods ####
+    # Positioning methods
 
     def center(self):
         self.shift(-self.get_center())
@@ -521,8 +521,7 @@ class Mobject(Container):
         return self
 
     def set_submobject_colors_by_radial_gradient(self, center=None, radius=1, inner_color=WHITE, outer_color=BLACK):
-        mobs = self.family_members_with_points()
-        if center == None:
+        if center is None:
             center = self.get_center()
 
         for mob in self.family_members_with_points():
@@ -618,7 +617,7 @@ class Mobject(Container):
     def get_all_points(self):
         return self.get_merged_array("points")
 
-    ### Getters ###
+    # Getters
 
     def get_points_defining_boundary(self):
         return self.points