      "from nose.tools import assert_equal\n",
      "\n",
      "\n",
      "class TestQuickSort(object):\n",
      "    def test_quick_sort(self, func):\n",
      "        print('None input')\n",
      "        data = None\n",
      "        sorted_data = func(data)\n",
      "        assert_equal(sorted_data, None)\n",
      "\n",
 
</s> remove     "from nose.tools import assert_equal\n",
 </s> add     "from nose.tools import assert_equal, assert_raises\n", </s> remove     "        data = None\n",
    "        sorted_data = func(data)\n",
    "        assert_equal(sorted_data, None)\n",
 </s> add     "        assert_raises(TypeError, quick_sort.sort, None)\n", </s> remove     "        data = []\n",
    "        sorted_data = func(data)\n",
    "        assert_equal(sorted_data, [])\n",
 </s> add     "        assert_equal(quick_sort.sort([]), [])\n", </s> remove     "        data = [5]\n",
    "        sorted_data = func(data)\n",
    "        assert_equal(sorted_data, [5])\n",
 </s> add     "        assert_equal(quick_sort.sort([5]), [5])\n", </s> remove     "        data = [5]\n",
    "        sorted_data = func(data)\n",
    "        assert_equal(sorted_data, [5])\n",
 </s> add     "        assert_equal(quick_sort.sort([5]), [5])\n",
    "\n",
    "    def test_quick_sort(self):\n",
    "        quick_sort = QuickSort()\n",
    "\n",
      "from nose.tools import assert_equal\n",
      "\n",
      "\n",
      "class TestQuickSort(object):\n",
    "\n",
    "    def test_quick_sort(self):\n",
    "        quick_sort = QuickSort()\n",
    "\n",
      "        print('None input')\n",
      "        data = None\n",
      "        sorted_data = func(data)\n",
      "        assert_equal(sorted_data, None)\n",
      "\n",
keep keep keep keep replace keep keep keep keep keep
 Update quicksort challenge (#134)

Update constraints, test cases, code, algorithm, and tests. 
sorting_searching/quick_sort/quick_sort_challenge.ipynb