diff --git a/ceilometer/alarm/evaluator/__init__.py b/ceilometer/alarm/evaluator/__init__.py
index 8f0abd41..0362ea87 100644
--- a/ceilometer/alarm/evaluator/__init__.py
+++ b/ceilometer/alarm/evaluator/__init__.py
@@ -19,16 +19,17 @@
 import abc
 import croniter
 import datetime
-import pytz
 
 from ceilometerclient import client as ceiloclient
 from oslo.config import cfg
+import pytz
 import six
 
 from ceilometer.openstack.common.gettextutils import _
 from ceilometer.openstack.common import log
 from ceilometer.openstack.common import timeutils
 
+
 LOG = log.getLogger(__name__)
 
 UNKNOWN = 'insufficient data'
diff --git a/ceilometer/alarm/notifier/rest.py b/ceilometer/alarm/notifier/rest.py
index 0526a9a1..f8b30fac 100644
--- a/ceilometer/alarm/notifier/rest.py
+++ b/ceilometer/alarm/notifier/rest.py
@@ -19,7 +19,7 @@
 import eventlet
 from oslo.config import cfg
 import requests
-from six.moves.urllib import parse as urlparse
+import six.moves.urllib.parse as urlparse
 
 from ceilometer.alarm import notifier
 from ceilometer.openstack.common.gettextutils import _
diff --git a/ceilometer/cli.py b/ceilometer/cli.py
index 74dede9c..b0ac118e 100644
--- a/ceilometer/cli.py
+++ b/ceilometer/cli.py
@@ -28,8 +28,6 @@ import eventlet
 # first read() or select(), thread need to be patched too, because
 # oslo.messaging use threading.local
 eventlet.monkey_patch(socket=True, select=True, thread=True)
-
-
 from oslo.config import cfg
 
 from ceilometer.alarm import service as alarm_service
@@ -48,6 +46,7 @@ from ceilometer import service
 from ceilometer import storage
 from ceilometer import transformer
 
+
 OPTS = [
     cfg.StrOpt('evaluation_service',
                default='ceilometer.alarm.service.SingletonAlarmService',
diff --git a/ceilometer/compute/nova_notifier.py b/ceilometer/compute/nova_notifier.py
index 7022fb64..58e500e9 100644
--- a/ceilometer/compute/nova_notifier.py
+++ b/ceilometer/compute/nova_notifier.py
@@ -17,27 +17,24 @@
 
 import sys
 
+from nova.compute import flavors
+from nova import conductor
 from nova import notifications
 from nova.openstack.common import log as logging
 from nova.openstack.common.notifier import api as notifier_api
+from nova import utils
+from stevedore import extension
 
 # HACK(dhellmann): Insert the nova version of openstack.common into
 # sys.modules as though it was the copy from ceilometer, so that when
 # we use modules from ceilometer below they do not re-define options.
 # use the real ceilometer base package
 import ceilometer  # noqa
-for name in ['openstack', 'openstack.common', 'openstack.common.log']:
-    sys.modules['ceilometer.' + name] = sys.modules['nova.' + name]
-
-from nova.compute import flavors
-from nova import conductor
-from nova import utils
-
-from stevedore import extension
-
 from ceilometer.compute.virt import inspector
 from ceilometer.openstack.common.gettextutils import _
 
+for name in ['openstack', 'openstack.common', 'openstack.common.log']:
+    sys.modules['ceilometer.' + name] = sys.modules['nova.' + name]
 
 # This module runs inside the nova compute
 # agent, which only configures the "nova" logger.
diff --git a/ceilometer/dispatcher/__init__.py b/ceilometer/dispatcher/__init__.py
index 8b14f282..a7baf5e7 100644
--- a/ceilometer/dispatcher/__init__.py
+++ b/ceilometer/dispatcher/__init__.py
@@ -16,9 +16,9 @@
 # under the License.
 
 import abc
-import six
 
 from oslo.config import cfg
+import six
 from stevedore import named
 
 from ceilometer.openstack.common.gettextutils import _
diff --git a/ceilometer/notifier.py b/ceilometer/notifier.py
index 6cbc26c0..53e06643 100644
--- a/ceilometer/notifier.py
+++ b/ceilometer/notifier.py
@@ -15,14 +15,14 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+from stevedore import extension
+
 from ceilometer.openstack.common import context as req_context
+from ceilometer.openstack.common.gettextutils import _
 from ceilometer.openstack.common import log as logging
 from ceilometer import pipeline
 from ceilometer import transformer
 
-from ceilometer.openstack.common.gettextutils import _
-from stevedore import extension
-
 
 LOG = logging.getLogger(__name__)
 
diff --git a/ceilometer/objectstore/swift.py b/ceilometer/objectstore/swift.py
index cb2fd03f..a671905c 100644
--- a/ceilometer/objectstore/swift.py
+++ b/ceilometer/objectstore/swift.py
@@ -21,7 +21,7 @@ from __future__ import absolute_import
 
 from keystoneclient import exceptions
 from oslo.config import cfg
-from six.moves.urllib import parse as urlparse
+import six.moves.urllib.parse as urlparse
 from swiftclient import client as swift
 
 from ceilometer.central import plugin
diff --git a/ceilometer/publisher/rpc.py b/ceilometer/publisher/rpc.py
index e189d911..3de9dbc6 100644
--- a/ceilometer/publisher/rpc.py
+++ b/ceilometer/publisher/rpc.py
@@ -24,7 +24,7 @@ import operator
 from oslo.config import cfg
 import oslo.messaging
 import oslo.messaging._drivers.common
-from six.moves.urllib import parse as urlparse
+import six.moves.urllib.parse as urlparse
 
 from ceilometer import messaging
 from ceilometer.openstack.common.gettextutils import _
diff --git a/ceilometer/storage/__init__.py b/ceilometer/storage/__init__.py
index 93050c94..359a2fba 100644
--- a/ceilometer/storage/__init__.py
+++ b/ceilometer/storage/__init__.py
@@ -19,7 +19,7 @@
 
 from oslo.config import cfg
 import six
-from six.moves.urllib import parse as urlparse
+import six.moves.urllib.parse as urlparse
 from stevedore import driver
 
 from ceilometer.openstack.common.gettextutils import _
diff --git a/ceilometer/storage/impl_mongodb.py b/ceilometer/storage/impl_mongodb.py
index a44a9b3c..b8654c59 100644
--- a/ceilometer/storage/impl_mongodb.py
+++ b/ceilometer/storage/impl_mongodb.py
@@ -29,9 +29,8 @@ import uuid
 
 import bson.code
 import bson.objectid
-import pymongo
-
 from oslo.config import cfg
+import pymongo
 
 from ceilometer.openstack.common import log
 from ceilometer.openstack.common import timeutils
diff --git a/ceilometer/tests/alarm/test_notifier.py b/ceilometer/tests/alarm/test_notifier.py
index 5ea72479..2d03a7a0 100644
--- a/ceilometer/tests/alarm/test_notifier.py
+++ b/ceilometer/tests/alarm/test_notifier.py
@@ -17,7 +17,7 @@
 
 import mock
 import requests
-from six.moves.urllib import parse as urlparse
+import six.moves.urllib.parse as urlparse
 
 from ceilometer.alarm import service
 from ceilometer.openstack.common import context
diff --git a/ceilometer/tests/alarm/test_singleton_alarm_svc.py b/ceilometer/tests/alarm/test_singleton_alarm_svc.py
index 5ac82875..7b16c143 100644
--- a/ceilometer/tests/alarm/test_singleton_alarm_svc.py
+++ b/ceilometer/tests/alarm/test_singleton_alarm_svc.py
@@ -17,8 +17,6 @@
 """Tests for ceilometer.alarm.service.SingletonAlarmService.
 """
 import mock
-
-
 from stevedore import extension
 
 from ceilometer.alarm import service
diff --git a/ceilometer/tests/base.py b/ceilometer/tests/base.py
index f980f44d..f0c79713 100644
--- a/ceilometer/tests/base.py
+++ b/ceilometer/tests/base.py
@@ -19,11 +19,10 @@
 """
 import functools
 import os.path
-import six
 
 import eventlet
 import oslo.messaging
-import oslo.messaging.conffixture
+import six
 from testtools import testcase
 
 from ceilometer import messaging
@@ -52,12 +51,6 @@ class BaseTestCase(test.BaseTestCase):
             'ceilometer.messaging.get_transport',
             return_value=self.transport))
 
-    def setUp(self):
-        super(BaseTestCase, self).setUp()
-        self.useFixture(mockpatch.Patch(
-            'oslo.config.cfg._get_config_dirs',
-            return_value=[self.path_get('etc/ceilometer')]))
-
     def assertTimestampEqual(self, first, second, msg=None):
         """Checks that two timestamps are equals.
 
diff --git a/ceilometer/tests/compute/virt/vmware/test_inspector.py b/ceilometer/tests/compute/virt/vmware/test_inspector.py
index d5ee4c85..1ecd7923 100644
--- a/ceilometer/tests/compute/virt/vmware/test_inspector.py
+++ b/ceilometer/tests/compute/virt/vmware/test_inspector.py
@@ -17,7 +17,6 @@ Tests for VMware Vsphere inspector.
 """
 
 import mock
-
 from oslo.vmware import api
 
 from ceilometer.compute.virt import inspector as virt_inspector
diff --git a/ceilometer/tests/event/test_endpoint.py b/ceilometer/tests/event/test_endpoint.py
index 83e3bdff..658b15d8 100644
--- a/ceilometer/tests/event/test_endpoint.py
+++ b/ceilometer/tests/event/test_endpoint.py
@@ -17,7 +17,6 @@
 """Tests for Ceilometer notify daemon."""
 
 import mock
-
 from oslo.config import cfg
 import oslo.messaging
 from stevedore import extension
diff --git a/ceilometer/tests/objectstore/test_swift_middleware.py b/ceilometer/tests/objectstore/test_swift_middleware.py
index 8ffe44e3..09ae7fc1 100644
--- a/ceilometer/tests/objectstore/test_swift_middleware.py
+++ b/ceilometer/tests/objectstore/test_swift_middleware.py
@@ -16,9 +16,9 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+import mock
 import six
 
-import mock
 try:
     # Swift >= 1.7.5
     import swift.common.swob
diff --git a/ceilometer/tests/orchestration/test_notifications.py b/ceilometer/tests/orchestration/test_notifications.py
index ebcc9fcd..33a2d1cf 100644
--- a/ceilometer/tests/orchestration/test_notifications.py
+++ b/ceilometer/tests/orchestration/test_notifications.py
@@ -17,6 +17,7 @@ import datetime
 import mock
 from oslo.config import cfg
 
+from ceilometer.openstack.common import log
 from ceilometer.openstack.common import test
 from ceilometer.orchestration import notifications
 from ceilometer import sample
@@ -38,7 +39,6 @@ STACK_ARN = u'arn:openstack:heat::%s:stacks/%s/%s' % (TENANT_ID,
 CONF = cfg.CONF
 CONF.set_override('use_stderr', True)
 
-from ceilometer.openstack.common import log
 LOG = log.getLogger(__name__)
 
 
diff --git a/ceilometer/tests/storage/test_impl_sqlalchemy.py b/ceilometer/tests/storage/test_impl_sqlalchemy.py
index 9c6e9bfb..112182ba 100644
--- a/ceilometer/tests/storage/test_impl_sqlalchemy.py
+++ b/ceilometer/tests/storage/test_impl_sqlalchemy.py
@@ -31,7 +31,6 @@ from ceilometer.openstack.common import timeutils
 from ceilometer.storage import impl_sqlalchemy
 from ceilometer.storage import models
 from ceilometer.storage.sqlalchemy import models as sql_models
-
 from ceilometer.tests import base as test_base
 from ceilometer.tests import db as tests_db
 from ceilometer.tests.storage import test_storage_scenarios as scenarios
diff --git a/ceilometer/tests/test_notification.py b/ceilometer/tests/test_notification.py
index e54e2d62..c334b477 100644
--- a/ceilometer/tests/test_notification.py
+++ b/ceilometer/tests/test_notification.py
@@ -18,7 +18,6 @@
 
 import eventlet
 import mock
-
 import oslo.messaging
 import oslo.messaging.conffixture
 from stevedore import extension
diff --git a/ceilometer/transformer/__init__.py b/ceilometer/transformer/__init__.py
index 4dcb2ad7..e747a322 100644
--- a/ceilometer/transformer/__init__.py
+++ b/ceilometer/transformer/__init__.py
@@ -16,8 +16,8 @@
 # under the License.
 
 import abc
-import six
 
+import six
 from stevedore import extension
 
 
diff --git a/tox.ini b/tox.ini
index a1e2df60..fcc17745 100644
--- a/tox.ini
+++ b/tox.ini
@@ -38,10 +38,9 @@ commands = {posargs}
 
 [flake8]
 # H305 imports not grouped correctly
-# H307 like imports should be grouped together
 # H405 multi line docstring summary not separated with an empty line
 # H904 Wrap long lines in parentheses instead of a backslash
-ignore = H305,H307,H405,H904
+ignore = H305,H405,H904
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,./ceilometer/openstack/common,*lib/python*,*egg,tools,nova_tests,build
 show-source = True