diff --git a/arrays_strings/reverse_string/reverse_string_solution.ipynb b/arrays_strings/reverse_string/reverse_string_solution.ipynb
index 18a2aae..05f6a82 100644
--- a/arrays_strings/reverse_string/reverse_string_solution.ipynb
+++ b/arrays_strings/reverse_string/reverse_string_solution.ipynb
@@ -36,7 +36,6 @@
    "source": [
     "## Constraints\n",
     "\n",
-
     "* Can I assume the string is ASCII?\n",
     "    * Yes\n",
     "    * Note: Unicode strings could require special handling depending on your language\n",
@@ -92,11 +91,14 @@
    },
    "outputs": [],
    "source": [
+    "from __future__ import division\n",
+    "\n",
+    "\n",
     "def list_of_chars(chars):\n",
     "    if chars is None:\n",
     "        return None\n",
     "    size = len(chars)\n",
-    "    for i in range(size/2):\n",
+    "    for i in range(size//2):\n",
     "        chars[i], chars[size-1-i] = \\\n",
     "            chars[size-1-i], chars[i]\n",
     "    return chars"
diff --git a/sorting_searching/merge_sort/merge_sort_solution.ipynb b/sorting_searching/merge_sort/merge_sort_solution.ipynb
index 93da0ea..fbc7ef4 100644
--- a/sorting_searching/merge_sort/merge_sort_solution.ipynb
+++ b/sorting_searching/merge_sort/merge_sort_solution.ipynb
@@ -113,7 +113,7 @@
     "def merge_sort(data):\n",
     "    if len(data) < 2:\n",
     "        return data\n",
-    "    mid = int(len(data) / 2)\n",
+    "    mid = len(data) // 2\n",
     "    left = data[0:mid]\n",
     "    right = data[mid:len(data)]\n",
     "    left = merge_sort(left)\n",
diff --git a/sorting_searching/quick_sort/quick_sort_solution.ipynb b/sorting_searching/quick_sort/quick_sort_solution.ipynb
index 471f9f9..1304015 100644
--- a/sorting_searching/quick_sort/quick_sort_solution.ipynb
+++ b/sorting_searching/quick_sort/quick_sort_solution.ipynb
@@ -94,7 +94,7 @@
     "        return data\n",
     "    left = []\n",
     "    right = []\n",
-    "    pivot_index = int(len(data) / 2)\n",
+    "    pivot_index = len(data) // 2\n",
     "    pivot_value = data[pivot_index]\n",
     "    \n",
     "    # Build the left and right partitions\n",