     },
     "outputs": [],
     "source": [
      "def height(node):\n",
      "    # TODO: Implement me"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
 
</s> remove     "from __future__ import print_function\n",
 </s> add  </s> remove     "from __future__ import print_function\n",
 </s> add  </s> remove from __future__ import print_function
 </s> add 
    "    # TODO: Implement me\n",
    "    pass"
     },
     "outputs": [],
     "source": [
      "def height(node):\n",
    "    # TODO: Implement me\n",
    "    pass"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
keep keep keep keep replace keep keep keep keep keep
 Removed unused import statements, fixed compile error on skeleton challenge code. 
graphs_trees/tree_height/height_challenge.ipynb