diff --git a/glanceclient/common/utils.py b/glanceclient/common/utils.py
index ff1ffd16..cebc9dff 100644
--- a/glanceclient/common/utils.py
+++ b/glanceclient/common/utils.py
@@ -172,8 +172,8 @@ def schema_args(schema_getter, omit=None):
     return _decorator
 
 
-def pretty_choice_list(l):
-    return ', '.join("'%s'" % i for i in l)
+def pretty_choice_list(choices):
+    return ', '.join("'%s'" % choice for choice in choices)
 
 
 def has_version(client, version):
diff --git a/glanceclient/tests/functional/v2/test_http_headers.py b/glanceclient/tests/functional/v2/test_http_headers.py
index 15964442..d4c9d9cc 100644
--- a/glanceclient/tests/functional/v2/test_http_headers.py
+++ b/glanceclient/tests/functional/v2/test_http_headers.py
@@ -57,5 +57,5 @@ class HttpHeadersTest(base.ClientTestBase):
                 image = glanceclient.glance.images.update(image.id,
                                                           disk_format="qcow2")
             except Exception as e:
-                self.assertFalse("415 Unsupported Media Type" in e.details)
+                self.assertNotIn("415 Unsupported Media Type", e.details)
             time.sleep(5)
diff --git a/glanceclient/tests/unit/test_utils.py b/glanceclient/tests/unit/test_utils.py
index dfa7a44a..805e7554 100644
--- a/glanceclient/tests/unit/test_utils.py
+++ b/glanceclient/tests/unit/test_utils.py
@@ -242,7 +242,7 @@ class TestUtils(testtools.TestCase):
         # Regression test for bug 1461678.
         def _iterate(i):
             for chunk in i:
-                raise(IOError)
+                raise IOError()
 
         data = io.StringIO('somestring')
         data.close = mock.Mock()
diff --git a/glanceclient/tests/unit/v2/test_images.py b/glanceclient/tests/unit/v2/test_images.py
index 72512031..3ce12c16 100644
--- a/glanceclient/tests/unit/v2/test_images.py
+++ b/glanceclient/tests/unit/v2/test_images.py
@@ -1468,7 +1468,7 @@ class TestController(testtools.TestCase):
         headers = {'x-openstack-request-id': 'req-1234'}
         fixture_idx = '/v2/images/%s' % (image_id)
         orig_locations = data_fixtures[fixture_idx]['GET'][1]['locations']
-        loc_map = dict([(l['url'], l) for l in orig_locations])
+        loc_map = dict([(loc['url'], loc) for loc in orig_locations])
         loc_map[new_loc['url']] = new_loc
         mod_patch = [{'path': '/locations', 'op': 'replace',
                       'value': list(loc_map.values())}]
diff --git a/glanceclient/tests/unit/v2/test_schemas.py b/glanceclient/tests/unit/v2/test_schemas.py
index c01d8bd5..9e060d4f 100644
--- a/glanceclient/tests/unit/v2/test_schemas.py
+++ b/glanceclient/tests/unit/v2/test_schemas.py
@@ -61,8 +61,8 @@ _SCHEMA = schemas.Schema({
 
 def compare_json_patches(a, b):
     """Return 0 if a and b describe the same JSON patch."""
-    return(jsonpatch.JsonPatch.from_string(a) ==
-           jsonpatch.JsonPatch.from_string(b))
+    return (jsonpatch.JsonPatch.from_string(a) ==
+            jsonpatch.JsonPatch.from_string(b))
 
 
 class TestSchemaProperty(testtools.TestCase):
diff --git a/glanceclient/v2/images.py b/glanceclient/v2/images.py
index e19f86ef..216837d0 100644
--- a/glanceclient/v2/images.py
+++ b/glanceclient/v2/images.py
@@ -514,7 +514,7 @@ class Controller(object):
         :returns: None
         """
         image = self._get_image_with_locations_or_fail(image_id)
-        current_urls = [l['url'] for l in image.locations]
+        current_urls = [loc['url'] for loc in image.locations]
 
         missing_locs = url_set.difference(set(current_urls))
         if missing_locs:
@@ -541,7 +541,7 @@ class Controller(object):
         :returns: The updated image
         """
         image = self._get_image_with_locations_or_fail(image_id)
-        url_map = dict([(l['url'], l) for l in image.locations])
+        url_map = dict([(loc['url'], loc) for loc in image.locations])
         if url not in url_map:
             raise exc.HTTPNotFound('Unknown URL: %s, the URL must be one of'
                                    ' existing locations of current image' %
diff --git a/glanceclient/v2/shell.py b/glanceclient/v2/shell.py
index 64c5cbd7..db74b0b2 100644
--- a/glanceclient/v2/shell.py
+++ b/glanceclient/v2/shell.py
@@ -526,6 +526,7 @@ def do_member_get(gc, args):
     member = gc.image_members.get(args.image_id, args.member_id)
     utils.print_dict(member)
 
+
 @utils.arg('image_id', metavar='<IMAGE_ID>',
            help=_('Image from which to remove member.'))
 @utils.arg('member_id', metavar='<MEMBER_ID>',
@@ -596,6 +597,7 @@ def do_import_info(gc, args):
     else:
         utils.print_dict(import_info)
 
+
 @utils.arg('--detail', default=False, action='store_true',
            help='Shows details of stores. Admin only.')
 def do_stores_info(gc, args):
diff --git a/test-requirements.txt b/test-requirements.txt
index d635495b..39b8dcd3 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,4 @@
-hacking>=3.0.1,<3.1.0 # Apache-2.0
+hacking>=6.1.0,<6.2.0 # Apache-2.0
 coverage!=4.4,>=4.0 # Apache-2.0
 os-client-config>=1.28.0 # Apache-2.0
 stestr>=2.0.0 # Apache-2.0