      "                   height(node.right))"
     ]
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "## Unit Test"
 
</s> remove    "execution_count": 4,
 </s> add    "execution_count": 5, </s> remove    "execution_count": 3,
 </s> add    "execution_count": 4, </s> remove    "outputs": [],
 </s> add    "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Writing height.py\n"
     ]
    }
   ],
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "%run height.py"
   ]
  },
      "                   height(node.right))"
     ]
    },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "%run height.py"
   ]
  },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "## Unit Test"
keep keep add keep keep keep keep keep
 Saved tree height challenge solution so it can be reused as a component to other related challenges. 
graphs_trees/tree_height/height_solution.ipynb