diff --git a/copycat/codeletMethods.py b/copycat/codeletMethods.py
index b36ecc2..11df779 100644
--- a/copycat/codeletMethods.py
+++ b/copycat/codeletMethods.py
@@ -73,7 +73,7 @@ def __getDescriptors(bondFacet, source, destination):
 
 
 def __allOppositeMappings(mappings):
-    return len([m for m in mappings if m.label != slipnet.opposite]) == 0
+    return all(m.label == slipnet.opposite for m in mappings)
 
 
 def __structureVsStructure(structure1, weight1, structure2, weight2):
diff --git a/copycat/group.py b/copycat/group.py
index fef8cd3..4ae181e 100644
--- a/copycat/group.py
+++ b/copycat/group.py
@@ -197,7 +197,7 @@ class Group(WorkspaceObject):
 
     def localSupport(self):
         numberOfSupporters = self.numberOfLocalSupportingGroups()
-        if numberOfSupporters == 0.0:
+        if numberOfSupporters == 0:
             return 0.0
         supportFactor = min(1.0, 0.6 ** (1 / (numberOfSupporters ** 3)))
         densityFactor = 100.0 * ((self.localDensity() / 100.0) ** 0.5)