Removing surplus brackets from print function

The 2to3 script added extra brackets around print functions that were
already compatible with Python 3. This has now been removed

	modified:   code/Advanced_Analytics_and_Machine_Learning-Chapter_25_Preprocessing_and_Feature_Engineering.py
	modified:   code/Advanced_Analytics_and_Machine_Learning-Chapter_28_Recommendation.py
	modified:   code/Advanced_Analytics_and_Machine_Learning-Chapter_31_Deep_Learning.py

code/Advanced_Analytics_and_Machine_Learning-Chapter_25_Preprocessing_and_Feature_Engineering.py

@@ -252,7 +252,7 @@
 result = model.transform(documentDF)
 for row in result.collect():
     text, vector = row
-    print(("Text: [%s] => \nVector: %s\n" % (", ".join(text), str(vector))))
+    print("Text: [%s] => \nVector: %s\n" % (", ".join(text), str(vector)))
 
 
 # COMMAND ----------

code/Advanced_Analytics_and_Machine_Learning-Chapter_28_Recommendation.py

@@ -36,7 +36,7 @@
   .setLabelCol("rating")\
   .setPredictionCol("prediction")
 rmse = evaluator.evaluate(predictions)
-print(("Root-mean-square error = %f" % rmse))
+print("Root-mean-square error = %f" % rmse)
 
 
 # COMMAND ----------

code/Advanced_Analytics_and_Machine_Learning-Chapter_31_Deep_Learning.py

@@ -38,8 +38,8 @@
 from pyspark.ml.evaluation import MulticlassClassificationEvaluator
 tested_df = p_model.transform(test_df)
 evaluator = MulticlassClassificationEvaluator(metricName="accuracy")
-print(("Test set accuracy = " + str(evaluator.evaluate(tested_df.select(
-  "prediction", "label")))))
+print("Test set accuracy = " + str(evaluator.evaluate(tested_df.select(
+  "prediction", "label"))))
 
 
 # COMMAND ----------