Remove from __future__ imports as we move away from Python 2

tools_pandas.ipynb

@@ -16,24 +16,14 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Setup\n",
-    "First, let's make sure this notebook works well in both python 2 and 3:"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 1,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "from __future__ import division, print_function, unicode_literals"
+    "# Setup"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Now let's import `pandas`. People usually import it as `pd`:"
+    "First, let's import `pandas`. People usually import it as `pd`:"
    ]
   },
   {
@@ -2817,7 +2807,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.3"
+   "version": "3.7.4"
   },
   "toc": {
    "toc_cell": false,