     ]
    },
    {
     "cell_type": "code",
     "execution_count": 2,
     "metadata": {
      "collapsed": false
     },
     "outputs": [],
     "source": [
      "def reverse_words(S):\n",
      "    if len(S) is 0:\n",
      "        return None\n",
 
</s> remove    "execution_count": 2,
   "metadata": {
    "collapsed": false
   },
 </s> add    "execution_count": 1,
   "metadata": {}, </s> remove     "    \n",
 </s> add     "\n", </s> remove    "execution_count": 8,
   "metadata": {
    "collapsed": false
   },
 </s> add    "execution_count": 2,
   "metadata": {}, </s> remove    "execution_count": 3,
   "metadata": {
    "collapsed": true
   },
 </s> add    "execution_count": 2,
   "metadata": {}, </s> remove    "metadata": {
    "collapsed": false
   },
 </s> add    "metadata": {},
   "execution_count": 1,
   "metadata": {},
     ]
    },
    {
     "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "execution_count": 1,
   "metadata": {},
   "execution_count": 1,
   "metadata": {},
   "execution_count": 1,
   "metadata": {},
     "outputs": [],
     "source": [
      "def reverse_words(S):\n",
      "    if len(S) is 0:\n",
      "        return None\n",
keep keep keep keep replace replace replace replace keep keep keep keep keep
 #273: Remove nose dependency for staging/ (#283) 
staging/arrays_strings/reverse_words/reverse_words_solution.ipynb