      {
       "name": "stdout",
       "output_type": "stream",
       "text": [
        "Writing height.py\n"
       ]
      }
     ],
     "source": [
      "%%writefile height.py\n",
 
</s> remove    "display_name": "Python 2",
 </s> add    "display_name": "Python 3", </s> remove    "display_name": "Python 2",
 </s> add    "display_name": "Python 3", </s> remove    "name": "python2"
 </s> add    "name": "python3"
      "Overwriting height.py\n"
      {
       "name": "stdout",
       "output_type": "stream",
       "text": [
      "Overwriting height.py\n"
       ]
      }
     ],
     "source": [
      "%%writefile height.py\n",
keep keep keep keep replace keep keep keep keep keep
 Update constraints for tree height challenge and solution (#87) 
graphs_trees/tree_height/height_solution.ipynb