Nested default dicts.ipynb

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   "source": "from collections import defaultdict\n\ndef vivify():\n    return defaultdict(vivify)\n\nd = vivify()\n\nd['foo']['bar']['qux']['wat'] = 'baz'\n\nd",
   "execution_count": 12,
   "outputs": [
    {
     "output_type": "execute_result",
     "data": {
      "text/plain": "defaultdict(<function __main__.vivify>,\n            {'foo': defaultdict(<function __main__.vivify>,\n                         {'bar': defaultdict(<function __main__.vivify>,\n                                      {'qux': defaultdict(<function __main__.vivify>,\n                                                   {'wat': 'baz'})})})})"
     },
     "metadata": {},
     "execution_count": 12
    }
   ]
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  {
   "metadata": {
    "trusted": true,
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   "cell_type": "code",
   "source": "",
   "execution_count": null,
   "outputs": []
  }
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