diff --git a/core.py b/core.py
index eaf7986..0a960f0 100644
--- a/core.py
+++ b/core.py
@@ -25,7 +25,7 @@ def __eq__(self, other):
 
     def getEdgeAdjacentToVertex(self,v):
         for edge in self.edges:
-            if edge.v2==v or edge.v1==v:
+            if edge.v2 is v or edge.v1 is v:
                 return edge
         return None