      "\n",
      "        graph.nodes[0].remove_neighbor(graph.nodes[1])\n",
      "        assert_equal(graph.nodes[1].incoming_edges, 0)\n",
      "        graph.nodes[3].remove_neighbor(graph.nodes[4])\n",
      "        assert_equal(graph.nodes[4].incoming_edges, 1)\n",
      "\n",
      "        assert_equal(graph.nodes[0] < graph.nodes[1], True)\n",
      "\n",
      "        print('Success: test_graph')\n",
      "\n",
 
</s>
    "        self.assertEqual(graph.nodes[4].incoming_edges, 1)\n",
      "\n",
      "        graph.nodes[0].remove_neighbor(graph.nodes[1])\n",
      "        assert_equal(graph.nodes[1].incoming_edges, 0)\n",
      "        graph.nodes[3].remove_neighbor(graph.nodes[4])\n",
    "        self.assertEqual(graph.nodes[4].incoming_edges, 1)\n",
      "\n",
      "        assert_equal(graph.nodes[0] < graph.nodes[1], True)\n",
      "\n",
      "        print('Success: test_graph')\n",
      "\n",
keep keep keep keep replace keep keep keep keep keep
 #273: Remove nose dependency for graphs_trees/ (#277)
graphs_trees/graph/graph_solution.ipynb