diff --git a/neutron/api/v2/attributes.py b/neutron/api/v2/attributes.py
index d7aea8c2ae..23f90e31f1 100644
--- a/neutron/api/v2/attributes.py
+++ b/neutron/api/v2/attributes.py
@@ -3,14 +3,14 @@
 # Copyright (c) 2012 OpenStack Foundation.
 # All Rights Reserved.
 #
-#    Licensed under the Apache License, Version 2.0 (the 'License'); you may
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
 #    not use this file except in compliance with the License. You may obtain
 #    a copy of the License at
 #
 #         http://www.apache.org/licenses/LICENSE-2.0
 #
 #    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an 'AS IS' BASIS, WITHOUT
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
diff --git a/neutron/api/v2/router.py b/neutron/api/v2/router.py
index 9f943d8f98..1a4196c503 100644
--- a/neutron/api/v2/router.py
+++ b/neutron/api/v2/router.py
@@ -1,13 +1,13 @@
 # Copyright (c) 2012 OpenStack Foundation.
 #
-# Licensed under the Apache License, Version 2.0 (the 'License');
+# Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #    http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an 'AS IS' BASIS,
+# distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 # implied.
 # See the License for the specific language governing permissions and
diff --git a/neutron/plugins/openvswitch/common/constants.py b/neutron/plugins/openvswitch/common/constants.py
index 0e6425f09f..7b42fb314d 100644
--- a/neutron/plugins/openvswitch/common/constants.py
+++ b/neutron/plugins/openvswitch/common/constants.py
@@ -1,13 +1,13 @@
 # Copyright (c) 2012 OpenStack Foundation.
 #
-# Licensed under the Apache License, Version 2.0 (the 'License');
+# Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #    http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an 'AS IS' BASIS,
+# distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 # implied.
 # See the License for the specific language governing permissions and
diff --git a/neutron/tests/unit/db/firewall/test_db_firewall.py b/neutron/tests/unit/db/firewall/test_db_firewall.py
index e5b8b3e2eb..052f95a7ee 100644
--- a/neutron/tests/unit/db/firewall/test_db_firewall.py
+++ b/neutron/tests/unit/db/firewall/test_db_firewall.py
@@ -12,7 +12,8 @@
 #  Unless required by applicable law or agreed to in writing, software
 #  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 #  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#  License for the spec
+#  License for the specific language governing permissions and limitations
+#  under the License.
 #
 # @author: Sumit Naiksatam, sumitnaiksatam@gmail.com, Big Switch Networks, Inc.
 
diff --git a/neutron/tests/unit/extensions/v2attributes.py b/neutron/tests/unit/extensions/v2attributes.py
index 49e86ba327..ab40f260af 100644
--- a/neutron/tests/unit/extensions/v2attributes.py
+++ b/neutron/tests/unit/extensions/v2attributes.py
@@ -1,13 +1,13 @@
 # Copyright (c) 2012 OpenStack Foundation.
 #
-# Licensed under the Apache License, Version 2.0 (the 'License');
+# Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #    http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an 'AS IS' BASIS,
+# distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 # implied.
 # See the License for the specific language governing permissions and
diff --git a/neutron/tests/unit/openvswitch/test_ovs_db.py b/neutron/tests/unit/openvswitch/test_ovs_db.py
index d16bf0ae45..8831cca072 100644
--- a/neutron/tests/unit/openvswitch/test_ovs_db.py
+++ b/neutron/tests/unit/openvswitch/test_ovs_db.py
@@ -1,13 +1,13 @@
 # Copyright (c) 2012 OpenStack Foundation.
 #
-# Licensed under the Apache License, Version 2.0 (the 'License');
+# Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #    http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an 'AS IS' BASIS,
+# distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 # implied.
 # See the License for the specific language governing permissions and
diff --git a/neutron/tests/unit/services/firewall/test_fwaas_plugin.py b/neutron/tests/unit/services/firewall/test_fwaas_plugin.py
index eda0e56de1..4d0f53383a 100644
--- a/neutron/tests/unit/services/firewall/test_fwaas_plugin.py
+++ b/neutron/tests/unit/services/firewall/test_fwaas_plugin.py
@@ -12,7 +12,8 @@
 #  Unless required by applicable law or agreed to in writing, software
 #  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 #  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#  License for the spec
+#  License for the specific language governing permissions and limitations
+#  under the License.
 #
 # @author: Sumit Naiksatam, sumitnaiksatam@gmail.com, Big Switch Networks, Inc.
 
diff --git a/neutron/tests/unit/services/loadbalancer/test_loadbalancer_plugin.py b/neutron/tests/unit/services/loadbalancer/test_loadbalancer_plugin.py
index ad1ef62534..a4130ba8fa 100644
--- a/neutron/tests/unit/services/loadbalancer/test_loadbalancer_plugin.py
+++ b/neutron/tests/unit/services/loadbalancer/test_loadbalancer_plugin.py
@@ -12,7 +12,8 @@
 #  Unless required by applicable law or agreed to in writing, software
 #  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 #  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#  License for the spec
+#  License for the specific language governing permissions and limitations
+#  under the License.
 
 import copy
 
diff --git a/neutron/tests/unit/test_extension_firewall.py b/neutron/tests/unit/test_extension_firewall.py
index d3d086995d..7550a706fe 100644
--- a/neutron/tests/unit/test_extension_firewall.py
+++ b/neutron/tests/unit/test_extension_firewall.py
@@ -12,8 +12,9 @@
 #  Unless required by applicable law or agreed to in writing, software
 #  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 #  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#  License for the spec
-#
+#  License for the specific language governing permissions and limitations
+#  under the License.
+
 # @author: Sumit Naiksatam, sumitnaiksatam@gmail.com, Big Switch Networks, Inc.
 
 import copy
diff --git a/neutron/tests/unit/test_quota_ext.py b/neutron/tests/unit/test_quota_ext.py
index 916da82351..5f33570b3c 100644
--- a/neutron/tests/unit/test_quota_ext.py
+++ b/neutron/tests/unit/test_quota_ext.py
@@ -1,3 +1,20 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright 2012 OpenStack Foundation.
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
 import mock
 from oslo.config import cfg
 import testtools
diff --git a/tox.ini b/tox.ini
index c87903eb88..cfd19a5ba9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -33,10 +33,11 @@ commands = {posargs}
 # E711/E712 comparison to False should be 'if cond is False:' or 'if not cond:'
 #        query = query.filter(Component.disabled == False)
 # E125 continuation line does not distinguish itself from next logical line
+# H233  Python 3.x incompatible use of print operator
 # H301 one import per line
 # H302 import only modules
 # TODO(marun) H404 multi line docstring should start with a summary
-ignore = E711,E712,E125,H301,H302,H404
+ignore = E711,E712,E125,H233,H301,H302,H404
 show-source = true
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,tools