{
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   "cell_type": "code",
   "execution_count": null,
   "id": "666a35e1-435d-4555-8193-9258ff568e21",
   "metadata": {},
   "outputs": [],
   "source": [
    "class letterLeaf:\n",
    "    def __init__(self,question):\n",
    "        self.yes = None\n",
    "        self.no = None\n",
    "        self.question = question\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "254b714a-2504-4cc0-9a78-21d406ddbb2f",
   "metadata": {},
   "outputs": [],
   "source": [
    "# tree traversals, here to print stuff \n",
    "def inorder(treeName):\n",
    "    if treeName:\n",
    "        inorder(treeName.yes)\n",
    "        print(treeName.question)\n",
    "        inorder(treeName.no)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "e8512457-7944-4604-92c7-29f90ab6c3db",
   "metadata": {},
   "outputs": [],
   "source": [
    "# interactive user input utility   \n",
    "def saysYes(ques):\n",
    "    while True:\n",
    "        ans = input(ques)\n",
    "        ans = ans[0:1].lower()\n",
    "        if ans == 'y': return True\n",
    "        else : return False"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "8415d1d2-211a-4e82-b331-85527e8c1510",
   "metadata": {},
   "source": [
    "reference\n",
    "https://web.stonehill.edu/compsci/CS211/Assignmenta%202015/TreeAssignment.pdf"
   ]
  }
 ],
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