     "mimetype": "text/x-python",
     "name": "python",
     "nbconvert_exporter": "python",
     "pygments_lexer": "ipython3",
     "version": "3.4.3"
    }
   },
   "nbformat": 4,
   "nbformat_minor": 0
  }
 
</s> remove    "version": "3.4.3"
 </s> add    "version": "3.5.0" </s> remove     "    return left + [pivot_value] + right"
 </s> add     "    return left + equal + right" </s> remove     "    for i in range(0, len(data)):\n",
    "        if i == pivot_index:\n",
    "            continue\n",
    "        if data[i] < pivot_value:\n",
 </s> add     "    for i in range(len(data)):\n",
    "        if data[i] == pivot_value:\n",
    "            equal.append(data[i])\n",
    "        elif data[i] < pivot_value:\n",
   "version": "3.5.0"
     "mimetype": "text/x-python",
     "name": "python",
     "nbconvert_exporter": "python",
     "pygments_lexer": "ipython3",
   "version": "3.5.0"
    }
   },
   "nbformat": 4,
   "nbformat_minor": 0
  }
keep keep keep keep replace keep keep keep keep keep
 Polish quicksort challenge and solution

Update constraints and code. 
sorting_searching/quick_sort/quick_sort_challenge.ipynb