make print statements Python 3 compatible (#149)

notebooks/3_NeuralNetworks/convolutional_network.ipynb

@@ -338,17 +338,17 @@
     "            loss, acc = sess.run([cost, accuracy], feed_dict={x: batch_x,\n",
     "                                                              y: batch_y,\n",
     "                                                              keep_prob: 1.})\n",
-    "            print \"Iter \" + str(step*batch_size) + \", Minibatch Loss= \" + \\\n",
+    "            print(\"Iter \" + str(step*batch_size) + \", Minibatch Loss= \" + \\\n",
     "                  \"{:.6f}\".format(loss) + \", Training Accuracy= \" + \\\n",
-    "                  \"{:.5f}\".format(acc)\n",
+    "                  \"{:.5f}\".format(acc))\n",
     "        step += 1\n",
-    "    print \"Optimization Finished!\"\n",
+    "    print(\"Optimization Finished!\")\n",
     "\n",
     "    # Calculate accuracy for 256 mnist test images\n",
-    "    print \"Testing Accuracy:\", \\\n",
+    "    print(\"Testing Accuracy:\", \\\n",
     "        sess.run(accuracy, feed_dict={x: mnist.test.images[:256],\n",
     "                                      y: mnist.test.labels[:256],\n",
-    "                                      keep_prob: 1.})"
+    "                                      keep_prob: 1.}))"
    ]
   },
   {