#
# SPDX-License-Identifier: Apache-2.0
-from __future__ import absolute_import
-from builtins import hex
-from builtins import str
-from builtins import range
-from builtins import object
import datetime
-import mock
import os
-import unittest
import time
+import unittest
+
+from unittest import mock
import arvados
from arvados._ranges import Range