INCR-123: Run python-modernize on common/djangoapps/track/backends (#20444)

* anthonywee/INCR-123

* isort

common/djangoapps/track/backends/__init__.py

@@ -10,13 +10,14 @@ from __future__ import absolute_import
 
 import abc
 
+import six
 
-class BaseBackend(object):
+
+class BaseBackend(six.with_metaclass(abc.ABCMeta, object)):
     """
     Abstract Base Class for event tracking backends.
 
     """
-    __metaclass__ = abc.ABCMeta
 
     def __init__(self, **kwargs):
         pass

common/djangoapps/track/backends/tests/test_logger.py

@@ -2,9 +2,9 @@
 """Tests for Event tracker backend."""
 from __future__ import absolute_import
 
+import datetime
 import json
 import logging
-import datetime
 
 from track.backends.logger import LoggerBackend
 

common/djangoapps/track/backends/tests/test_mongodb.py

@@ -1,8 +1,7 @@
 from __future__ import absolute_import
 
-from mock import patch
-
 from django.test import TestCase
+from mock import patch
 
 from track.backends.mongodb import MongoBackend