diff --git a/glanceclient/common/utils.py b/glanceclient/common/utils.py
index c92836e3..bc0c0eb2 100644
--- a/glanceclient/common/utils.py
+++ b/glanceclient/common/utils.py
@@ -28,10 +28,10 @@ import uuid
 
 import six
 
-if os.name == 'nt':
-    import msvcrt
-else:
-    msvcrt = None
+if os.name == 'nt':  # noqa
+    import msvcrt  # noqa
+else:  # noqa
+    msvcrt = None  # noqa
 
 from oslo_utils import encodeutils
 from oslo_utils import strutils
diff --git a/glanceclient/tests/unit/v1/test_shell.py b/glanceclient/tests/unit/v1/test_shell.py
index 95bbd07c..a3bd29b4 100644
--- a/glanceclient/tests/unit/v1/test_shell.py
+++ b/glanceclient/tests/unit/v1/test_shell.py
@@ -334,8 +334,8 @@ class ShellInvalidEndpointandParameterTest(utils.TestCase):
             e = self.assertRaises(exc.CommandError, self.run_command,
                                   '--os-image-api-version 1 image-create ' +
                                   origin + ' fake_src --container-format bare')
-            self.assertEqual('error: Must provide --disk-format when using '
-                             + origin + '.', e.message)
+            self.assertEqual('error: Must provide --disk-format when using ' +
+                             origin + '.', e.message)
 
     @mock.patch('sys.stderr')
     def test_image_create_missing_container_format(self, __):
@@ -536,8 +536,8 @@ class ShellStdinHandlingTests(testtools.TestCase):
         self._do_update()
 
         self.assertTrue(
-            'data' not in self.collected_args[1]
-            or self.collected_args[1]['data'] is None
+            'data' not in self.collected_args[1] or
+            self.collected_args[1]['data'] is None
         )
 
     def test_image_update_opened_stdin(self):
diff --git a/glanceclient/tests/unit/v2/test_shell_v2.py b/glanceclient/tests/unit/v2/test_shell_v2.py
index b8161e37..84ef1f02 100644
--- a/glanceclient/tests/unit/v2/test_shell_v2.py
+++ b/glanceclient/tests/unit/v2/test_shell_v2.py
@@ -57,7 +57,7 @@ def schema_args(schema_getter, omit=None):
     return original_schema_args(my_schema_getter, omit)
 utils.schema_args = schema_args
 
-from glanceclient.v2 import shell as test_shell
+from glanceclient.v2 import shell as test_shell  # noqa
 
 # Return original decorator.
 utils.schema_args = original_schema_args
diff --git a/glanceclient/v1/shell.py b/glanceclient/v1/shell.py
index fff74904..c60ee3fa 100644
--- a/glanceclient/v1/shell.py
+++ b/glanceclient/v1/shell.py
@@ -45,11 +45,11 @@ _bool_strict = functools.partial(strutils.bool_from_string, strict=True)
            help='Filter images to those that changed since the given time'
                 ', which will include the deleted images.')
 @utils.arg('--container-format', metavar='<CONTAINER_FORMAT>',
-           help='Filter images to those that have this container format. '
-                + CONTAINER_FORMATS)
+           help='Filter images to those that have this container format. ' +
+                CONTAINER_FORMATS)
 @utils.arg('--disk-format', metavar='<DISK_FORMAT>',
-           help='Filter images to those that have this disk format. '
-                + DISK_FORMATS)
+           help='Filter images to those that have this disk format. ' +
+                DISK_FORMATS)
 @utils.arg('--size-min', metavar='<SIZE>', type=int,
            help='Filter images to those with a size greater than this.')
 @utils.arg('--size-max', metavar='<SIZE>', type=int,
diff --git a/test-requirements.txt b/test-requirements.txt
index 04243937..8e8541ca 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,7 +1,8 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
-hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
+
+hacking>=1.1.0,<1.2.0 # Apache-2.0
 
 coverage!=4.4,>=4.0 # Apache-2.0
 mock>=2.0.0 # BSD
diff --git a/tox.ini b/tox.ini
index b2b2865a..27170de9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -74,7 +74,8 @@ commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [flake8]
-ignore = F403,F812,F821
+# E731 skipped as assign a lambda expression
+ignore = E731,F403,F812,F821
 show-source = True
 exclude = .venv*,.tox,dist,*egg,build,.git,doc,*lib/python*,.update-venv