Create default dict to find valid keys for Advent of Code 4-1, part 1

AoC4-1.ipynb

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     "data": {
      "text/plain": [
       "defaultdict(<class 'list'>, {1: ['l', 'e', 't', 'm', 'n'], 2: ['a', 'r'], 3: ['o']})"
      ]
     },
     "execution_count": 4,
     "metadata": {},
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   "source": [
    "from collections import defaultdict\n",
    "r = defaultdict(list)\n",
    "\n",
    "#test='aaaaa-bbb-z-y-x-123[abxyz]'\n",
    "test = 'not-a-real-room-404[oarel]'\n",
    "\n",
    "#TODO: Use regular expressions\n",
    "bk= test.rfind('-')\n",
    "(room, sector,check) = (test[0:bk].translate(str.maketrans('','','-')), test[bk+1:-7], test[-6:-1])\n",
    "\n",
    "for K in set(room):\n",
    "    r[room.count(K)].append(K)\n",
    "    \n",
    "r"
   ]
  },
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   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "'oarelmnt'"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "checksum = ''.join([''.join(sorted(r[x])) for x in sorted(r.keys(),reverse=True)])\n",
    "checksum"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "404\n"
     ]
    }
   ],
   "source": [
    "if checksum[:5] == check: print(sector)"
   ]
  }
 ],
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