     "execution_count": null,
     "metadata": {
      "collapsed": false
     },
     "outputs": [],
     "source": [
      "%%writefile queue_list.py\n",
      "# Need to avoid naming this queue.py as it will conflict with IPython Notebook\n",
      "\n",
      "class Node(object):\n",
 
</s> remove     "# Need to avoid naming this queue.py as it will conflict with IPython Notebook\n",
 </s> add     "# Need to avoid naming this queue.py as it \n",
    "# will conflict with IPython Notebook\n", </s> remove # Need to avoid naming this queue.py as it will conflict with IPython Notebook
 </s> add # Need to avoid naming this queue.py as it 
# will conflict with IPython Notebook </s> remove    "execution_count": null,
 </s> add    "execution_count": 3, </s> remove    "execution_count": null,
 </s> add    "execution_count": 2, </s> remove    "execution_count": null,
 </s> add    "execution_count": 1,
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Overwriting queue_list.py\n"
     ]
    }
   ],
     "execution_count": null,
     "metadata": {
      "collapsed": false
     },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Overwriting queue_list.py\n"
     ]
    }
   ],
     "source": [
      "%%writefile queue_list.py\n",
      "# Need to avoid naming this queue.py as it will conflict with IPython Notebook\n",
      "\n",
      "class Node(object):\n",
keep keep keep keep replace keep keep keep keep keep
 Reworked notebook: Added more detail to constraints and test cases.  Reworked unit test.  Added linebreak to comment about naming clash with queue. 
stacks-queues/queue-list.ipynb