diff --git a/surf/geometry.py b/surf/geometry.py
index 2e39f23..19356ad 100644
--- a/surf/geometry.py
+++ b/surf/geometry.py
@@ -174,7 +174,8 @@ class PolygonMesh(object):
         """
         if self._faces_for_edge is None:
             # TODO: eventually support generating this ourselves ...
-            raise AttributeError("Not yet implemented if you don't explicitly pass this in")
+            raise AttributeError("Not yet implemented if you don't explicitly"
+            " pass this in")
         return self._faces_for_edge
 
     @property
@@ -182,7 +183,8 @@ class PolygonMesh(object):
         """returns a list of edge indices for a given face index."""
         if self._edges_for_face is None:
             # TODO: eventually support generating this ourselves ...
-            raise AttributeError("Not yet implemented if you don't explicitly pass this in")
+            raise AttributeError("Not yet implemented if you don't explicitly"
+            " pass this in")
         return self._edges_for_face
 
     @property
@@ -190,7 +192,8 @@ class PolygonMesh(object):
         """returns a list of edge indices for a given vertex index."""
         if self._edges_for_vert is None:
             # TODO: eventually support generating this ourselves ...
-            raise AttributeError("Not yet implemented if you don't explicitly pass this in")
+            raise AttributeError("Not yet implemented if you don't explicitly"
+            " pass this in")
         return self._edges_for_vert
 
     @property
@@ -198,7 +201,8 @@ class PolygonMesh(object):
         """returns a list of face indices for a given vert index."""
         if self._faces_for_vert is None:
             # TODO: eventually support generating this ourselves ...
-            raise AttributeError("Not yet implemented if you don't explicitly pass this in")
+            raise AttributeError("Not yet implemented if you don't explicitly"
+            " pass this in")
         return self._faces_for_vert
 
     def __unicode__(self):
diff --git a/surf/subd/cc.py b/surf/subd/cc.py
index ca6bfb3..d1e765d 100644
--- a/surf/subd/cc.py
+++ b/surf/subd/cc.py
@@ -232,7 +232,8 @@ def refine(poly):
         centroid_to_edge.vertex_ids = [edge_v_id, start_centroid.id]
 
         # set the new edge's winged_edge references
-        # centroid_to_edge.edge_ids = poly.edges  ==>  get edge by id not yet implemented... edge_v_id.edges
+        # centroid_to_edge.edge_ids = poly.edges  ==>  get edge by id not yet
+        # implemented... edge_v_id.edges
 
         # set the edge vertex edge references
         edge_v_id.edges.append(centroid_to_edge.id)
@@ -250,7 +251,8 @@ def refine(poly):
         # f = sum(list(
             # set(face_vertices)), Vertex()) / len(list(set(face_vertices)))
         # r = sum(list(
-            # set(edge_mid_points)), Vertex()) / len(list(set(edge_mid_points)))
+            # set(edge_mid_points)), Vertex())
+            # / len(list(set(edge_mid_points)))
         # p = vertex
         # n = len(vertex.edges)
         # v = (f + 2.0 * r + (n - 3.0) * p) / n