ch11 py27 compatibility fixes

Author: rasbt

code/ch11/ch11.ipynb

@@ -396,7 +396,7 @@
     "    c_silhouette_vals = silhouette_vals[y_km == c]\n",
     "    c_silhouette_vals.sort()\n",
     "    y_ax_upper += len(c_silhouette_vals)\n",
-    "    color = cm.jet(i / n_clusters)\n",
+    "    color = cm.jet(float(i) / n_clusters)\n",
     "    plt.barh(range(y_ax_lower, y_ax_upper), c_silhouette_vals, height=1.0, \n",
     "             edgecolor='none', color=color)\n",
     "\n",
@@ -499,7 +499,7 @@
     "    c_silhouette_vals = silhouette_vals[y_km == c]\n",
     "    c_silhouette_vals.sort()\n",
     "    y_ax_upper += len(c_silhouette_vals)\n",
-    "    color = cm.jet(i / n_clusters)\n",
+    "    color = cm.jet(float(i) / n_clusters)\n",
     "    plt.barh(range(y_ax_lower, y_ax_upper), c_silhouette_vals, height=1.0, \n",
     "             edgecolor='none', color=color)\n",
     "\n",
@@ -1316,21 +1316,21 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 2",
+   "display_name": "Python 3",
    "language": "python",
-   "name": "python2"
+   "name": "python3"
   },
   "language_info": {
    "codemirror_mode": {
     "name": "ipython",
-    "version": 2
+    "version": 3
    },
    "file_extension": ".py",
    "mimetype": "text/x-python",
    "name": "python",
    "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython2",
-   "version": "2.7.11"
+   "pygments_lexer": "ipython3",
+   "version": "3.5.1"
   }
  },
  "nbformat": 4,