style: fix some flake8 style errors

Author: aidaph

caso/extract/openstack/cinder.py

@@ -54,7 +54,9 @@ def _build_record(self, volume, extract_from, extract_to):
             vol_created = extract_from
 
         active_duration_delta = (extract_to - vol_created)
-        active_duration = (extract_to - vol_created - datetime.timedelta(microseconds=active_duration_delta.microseconds)).total_seconds()
+        ms = active_duration_delta.microseconds
+        td = datetime.timedelta(microseconds=ms)
+        active_duration = (active_duration_delta - td).total_seconds()
 
         r = record.StorageRecord(
             uuid=volume.id,

caso/tests/extract/test_manager.py

@@ -25,10 +25,10 @@
 from unittest import mock
 
 from caso.extract import manager
-from caso.tests import base
 
 CONF = cfg.CONF
 
+
 class TestCasoManager(unittest.TestCase):
     """Test case for the cASO extractor manager."""
 
@@ -66,7 +66,6 @@ def test_extract_empty_projects(self):
         self.assertFalse(self.m_extractor.extract.called)
         self.assertEqual(ret, [])
 
-
     def test_extract(self):
         """Test that we extract records for a given project."""
         self.flags(dry_run=True)

caso/tests/extract/test_nova.py

@@ -15,11 +15,10 @@
 """Tests for the OpenStack nova extractor."""
 
 from caso.extract.openstack import nova
-from caso.extract import manager
-from caso.tests import base
 
 import unittest
 
+
 class TestCasoManager(unittest.TestCase):
     """Test case for Nova extractor."""
 

caso/tests/test_manager.py

@@ -14,14 +14,12 @@
 
 """Tests for `caso.manager` module."""
 
-from unittest.mock import patch 
 from oslo_concurrency.fixture import lockutils as lock_fixture
 import six
 import unittest
 from unittest import mock
 
 from caso import manager
-from caso.tests import base
 
 
 class TestCasoManager(unittest.TestCase):
@@ -48,4 +46,3 @@ def tearDown(self):
             p.stop()
 
         super(TestCasoManager, self).tearDown()
-