Remove a number of coding standards violations in the example notebook

Author: JamesGardiner

examples/FastMarkerCluster.ipynb

@@ -35,9 +35,9 @@
    "source": [
     "n = 1000\n",
     "\n",
-    "# Create a list of lists that correspond to [[lat, lon], [lat, lon]]\n",
+    "#  Create a list of lists that correspond to [[lat, lon], [lat, lon]]\n",
     "data = np.array([\n",
-    "    np.random.uniform(low=35, high=60, size=n),   # Random latitude\n",
+    "    np.random.uniform(low=35, high=60, size=n),  # Random latitude\n",
     "    np.random.uniform(low=-12, high=30, size=n)  # Random longitude\n",
     "]).T.tolist()\n",
     "\n",
@@ -72,17 +72,18 @@
     }
    ],
    "source": [
-    "# A custom callback can be passed to edit the markers.\n",
-    "# This should be a string representation of a valid JavaScript function.\n",
+    "\"\"\"A custom callback can be passed to edit the markers.\n",
+    "   This should be a string representation of a valid JavaScript function.\n",
+    "\"\"\"\n",
     "callback = ('function (row) {' +\n",
-    "                     'var icon, marker;' +\n",
-    "                     'icon = L.AwesomeMarkers.icon({' +\n",
-    "                     'icon: \"map-marker\", markerColor: \"red\"});' +\n",
-    "                     'marker = L.marker(new L.LatLng(row[0], ' +\n",
-    "                     'row[1]));' +\n",
-    "                     'marker.setIcon(icon);' +\n",
-    "                     'return marker;' +\n",
-    "                     '};')\n",
+    "            'var icon, marker;' +\n",
+    "            'icon = L.AwesomeMarkers.icon({' +\n",
+    "            'icon: \"map-marker\", markerColor: \"red\"});' +\n",
+    "            'marker = L.marker(new L.LatLng(row[0], ' +\n",
+    "            'row[1]));' +\n",
+    "            'marker.setIcon(icon);' +\n",
+    "            'return marker;' +\n",
+    "            '};')\n",
     "\n",
     "m = folium.Map([45., 3.], zoom_start=6)\n",
     "mc = plugins.FastMarkerCluster(data, callback=callback)\n",