simplify the nodes method

Xuefeng-Zhu · Xuefeng-Zhu · commit 6c09ea5e2b96 · 2015-05-10T23:45:11.000-05:00
dict.keys() should return list
diff --git a/graphs/graph.py b/graphs/graph.py
@@ -61,7 +61,7 @@ def nodes(self):
         """
         Returns a list of nodes in the graph
         """
-        return list(self.node_neighbors.keys())
+        return self.node_neighbors.keys()
 
     def has_edge(self, edge):
         """
