Merge pull request #11 from PPPLDeepLearning/python3_compatibility

Python3 compatibility

Author: ASvyatkovskiy

examples/guarantee_preprocessed.py

@@ -18,7 +18,7 @@
 pp = Preprocessor(conf)
 pp.clean_shot_lists()
 shot_list = pp.preprocess_all()
-sorted(shot_list)
+sorted(shot_list,key = lambda shot: shot.get_number())
 shot_list_train,shot_list_test = shot_list.split_train_test(conf)
 num_shots = len(shot_list_train) + len(shot_list_test)
 validation_frac = conf['training']['validation_frac']