diff --git a/samples/mgmt_driver/kubernetes/kubernetes_mgmt.py b/samples/mgmt_driver/kubernetes/kubernetes_mgmt.py
index 6d55b604e..6072daaef 100644
--- a/samples/mgmt_driver/kubernetes/kubernetes_mgmt.py
+++ b/samples/mgmt_driver/kubernetes/kubernetes_mgmt.py
@@ -719,7 +719,7 @@ class KubernetesMgmtDriver(vnflcm_abstract_driver.VnflcmMgmtAbstractDriver):
                 stderr = result[1]
                 unnecessary_msg = "WARNING! Using --password via the CLI"
                 err_info = (
-                    [line for line in stderr if not(unnecessary_msg in line)])
+                    [line for line in stderr if not (unnecessary_msg in line)])
                 err_msg = ("Failed to login Docker private registry. "
                     "ErrInfo:{}".format(err_info))
                 LOG.error(err_msg)
diff --git a/tacker/api/v1/attributes.py b/tacker/api/v1/attributes.py
index eec521ea8..6e7285611 100644
--- a/tacker/api/v1/attributes.py
+++ b/tacker/api/v1/attributes.py
@@ -291,10 +291,11 @@ def _validate_ip_address_or_none(data, valid_values=None):
     return _validate_ip_address(data, valid_values)
 
 
-def _validate_subnet(data, valid_values=None):
+def _validate_subnet(data, valid_values=None, expand_partial_value=False):
     msg = None
     try:
-        net = netaddr.IPNetwork(_validate_no_whitespace(data))
+        net = netaddr.IPNetwork(_validate_no_whitespace(data),
+                                expand_partial=expand_partial_value)
         if '/' not in data:
             msg = _("'%(data)s' isn't a recognized IP subnet cidr,"
                     " '%(cidr)s' is recommended") % {"data": data,
@@ -308,7 +309,8 @@ def _validate_subnet(data, valid_values=None):
     return msg
 
 
-def _validate_subnet_list(data, valid_values=None):
+def _validate_subnet_list(data, valid_values=None,
+                          expand_partial_value=False):
     if not isinstance(data, list):
         msg = _("'%s' is not a list") % data
         LOG.debug(msg)
@@ -320,15 +322,16 @@ def _validate_subnet_list(data, valid_values=None):
         return msg
 
     for item in data:
-        msg = _validate_subnet(item)
+        msg = _validate_subnet(item, valid_values, expand_partial_value)
         if msg:
             return msg
 
 
-def _validate_subnet_or_none(data, valid_values=None):
+def _validate_subnet_or_none(data, valid_values=None,
+                             expand_partial_value=False):
     if data is None:
         return
-    return _validate_subnet(data, valid_values)
+    return _validate_subnet(data, valid_values, expand_partial_value)
 
 
 def _validate_regex(data, valid_values=None):
diff --git a/tacker/api/vnflcm/v1/controller.py b/tacker/api/vnflcm/v1/controller.py
index 6035276c7..f430bdf13 100644
--- a/tacker/api/vnflcm/v1/controller.py
+++ b/tacker/api/vnflcm/v1/controller.py
@@ -553,7 +553,7 @@ class VnfLcmController(wsgi.Controller):
 
         except nfvo.VimDefaultNotDefined as exc:
             raise webob.exc.HTTPBadRequest(explanation=str(exc))
-        except(sqlexc.SQLAlchemyError, Exception) as exc:
+        except (sqlexc.SQLAlchemyError, Exception) as exc:
             raise webob.exc.HTTPInternalServerError(
                 explanation=str(exc))
         except webob.exc.HTTPNotFound as e:
diff --git a/tacker/auth.py b/tacker/auth.py
index e04c62230..4f9021b57 100644
--- a/tacker/auth.py
+++ b/tacker/auth.py
@@ -516,7 +516,7 @@ class _AuthValidateManager:
 
 class AuthValidatorExecution(base.ConfigurableMiddleware):
 
-    @ webob.dec.wsgify
+    @webob.dec.wsgify
     def __call__(self, req):
         auth_validator_manager.auth_main(req, self.application)
         return self.application
diff --git a/tacker/conductor/conductor_server.py b/tacker/conductor/conductor_server.py
index cf925e925..a115320db 100644
--- a/tacker/conductor/conductor_server.py
+++ b/tacker/conductor/conductor_server.py
@@ -912,9 +912,9 @@ class Conductor(manager.Manager, v2_hook.ConductorV2Hook):
 
         except Exception as ex:
             # with excutils.save_and_reraise_exception():
-            error_msg = "Failed to add additional vnf info to vnf {}. Details -\
-                 {}".format(
-                vnf_instance.id, str(ex))
+            error_msg = (
+                "Failed to add additional vnf info to vnf {}. Details - {}".
+                format(vnf_instance.id, str(ex)))
             LOG.error("_add_additional_vnf_info error {}".format(error_msg))
             raise exceptions.TackerException(message=error_msg)
 
@@ -1784,7 +1784,7 @@ class Conductor(manager.Manager, v2_hook.ConductorV2Hook):
                         'href': self._get_vnf_lcm_op_occs_href(
                             vnf_lcm_op_occs_id)}}}
 
-            if(operation_state == fields.LcmOccsOperationState.COMPLETED or
+            if (operation_state == fields.LcmOccsOperationState.COMPLETED or
                operation_state == fields.LcmOccsOperationState.FAILED_TEMP or
                operation_state == fields.LcmOccsOperationState.FAILED):
                 affected_resources = vnflcm_utils._get_affected_resources(
diff --git a/tacker/context.py b/tacker/context.py
index ce9ab5a44..bf21f867b 100644
--- a/tacker/context.py
+++ b/tacker/context.py
@@ -132,7 +132,7 @@ class ContextBase(oslo_context.RequestContext):
         return context
 
     def can(self, action, target=None, fatal=True):
-        """Verifies that the given action is valid on the target in this context.
+        """Verifies that the given action is valid on the target.
 
         :param action: string representing the action to be checked.
         :param target: dictionary representing the object of the action
diff --git a/tacker/db/vnfm/vnfm_db.py b/tacker/db/vnfm/vnfm_db.py
index bc6a0d407..141de2d9e 100644
--- a/tacker/db/vnfm/vnfm_db.py
+++ b/tacker/db/vnfm/vnfm_db.py
@@ -273,7 +273,7 @@ class VNFMPluginDb(vnfm.VNFMPluginBase, db_base.CommonDbMixin):
                              "is not permitted. Please contact your "
                              "Administrator.")
             raise vnfm.VNFDeleteFailed(reason=error_reason)
-        if(vnf_db.status in [constants.PENDING_UPDATE,
+        if (vnf_db.status in [constants.PENDING_UPDATE,
                              constants.PENDING_HEAL]):
             raise vnfm.VNFInUse(vnf_id=vnf_id)
         return True
diff --git a/tacker/hacking/checks.py b/tacker/hacking/checks.py
index 00a7e584d..991997571 100644
--- a/tacker/hacking/checks.py
+++ b/tacker/hacking/checks.py
@@ -37,11 +37,11 @@ log_translation = re.compile(
 
 
 @core.flake8ext
-def validate_log_translations(physical_line, logical_line, filename):
+def validate_log_translations(logical_line, filename):
     # Translations are not required in the test directory
     if "tacker/tests" in filename:
         return
-    if pycodestyle.noqa(physical_line):
+    if pycodestyle.noqa(logical_line):
         return
     msg = "N320: Log messages require translations!"
     if log_translation.match(logical_line):
diff --git a/tacker/objects/vnf_lcm_op_occs.py b/tacker/objects/vnf_lcm_op_occs.py
index d1e483123..a5c9348b9 100644
--- a/tacker/objects/vnf_lcm_op_occs.py
+++ b/tacker/objects/vnf_lcm_op_occs.py
@@ -94,7 +94,7 @@ def _make_vnf_lcm_op_occs_list(context, op_occ_list,
 
     op_occ_list.objects = []
     for db_op_occ in db_op_occ_list:
-        if(db_op_occ['changed_info'] and
+        if (db_op_occ['changed_info'] and
                 isinstance(db_op_occ['changed_info'], str)):
             db_op_occ['changed_info'] = jsonutils.loads(
                 db_op_occ['changed_info'])
diff --git a/tacker/tests/functional/common/fake_server.py b/tacker/tests/functional/common/fake_server.py
index 8f8dea5b1..86c27623a 100644
--- a/tacker/tests/functional/common/fake_server.py
+++ b/tacker/tests/functional/common/fake_server.py
@@ -45,7 +45,7 @@ def PrepareRequestHandler(manager):
             for objChkUrl in func_uri_list:
                 # Check which requested path is in our list.
                 LOG.debug('path for check:%s' % objChkUrl)
-                if(self.path.startswith(objChkUrl)):
+                if (self.path.startswith(objChkUrl)):
                     return True
             return False
 
diff --git a/tacker/tests/functional/sol_kubernetes_v2/test_threshold_prometheus_plugin.py b/tacker/tests/functional/sol_kubernetes_v2/test_threshold_prometheus_plugin.py
index 307ccd8cb..9e421ca59 100644
--- a/tacker/tests/functional/sol_kubernetes_v2/test_threshold_prometheus_plugin.py
+++ b/tacker/tests/functional/sol_kubernetes_v2/test_threshold_prometheus_plugin.py
@@ -48,7 +48,7 @@ class VnfPmThresholdTest(base_v2.BaseVnfLcmKubernetesV2Test):
             response_headers={"Content-Type": "text/plain"})
 
     def test_pm_threshold_autoscaling_min(self):
-        """Test PM Threshold operations with omitting except for required attributes
+        """Test PM Threshold operations with omitting except for required attr
 
         * About attributes:
           Omit except for required attributes.
diff --git a/tacker/tests/unit/api/v1/test_attributes.py b/tacker/tests/unit/api/v1/test_attributes.py
index 303f174ac..b2a316ff7 100644
--- a/tacker/tests/unit/api/v1/test_attributes.py
+++ b/tacker/tests/unit/api/v1/test_attributes.py
@@ -455,7 +455,9 @@ class TestAttributes(base.BaseTestCase):
 
         # Valid - abbreviated ipv4 address
         cidr = "10/24"
-        msg = validator(cidr, None)
+        # Note: It is necessary to specify "expand_partial=True" for "10/24"
+        # from netaddr 1.3.0.
+        msg = validator(cidr, None, True)
         self.assertIsNone(msg)
 
         # Invalid - IPv4 missing mask
diff --git a/tacker/tests/unit/conductor/test_conductor_server.py b/tacker/tests/unit/conductor/test_conductor_server.py
index cf48229e9..8ef42e1c9 100644
--- a/tacker/tests/unit/conductor/test_conductor_server.py
+++ b/tacker/tests/unit/conductor/test_conductor_server.py
@@ -230,8 +230,8 @@ class TestConductor(SqlTestCase, unit_base.FixturedTestCase):
                                          mock_prepare):
         mock_prepare.return_value = self.cctxt_mock
         address_information = "http://test.zip"
-        mock_store.return_value = 'location', 0, 'checksum',\
-                                  'multihash', 'loc_meta'
+        mock_store.return_value = (
+            'location', 0, 'checksum', 'multihash', 'loc_meta')
         self.conductor.upload_vnf_package_from_uri(self.context,
                                                    self.vnf_package,
                                                    address_information,
diff --git a/tacker/tests/unit/vnflcm/test_sync_resource.py b/tacker/tests/unit/vnflcm/test_sync_resource.py
index 905f0714c..1c2f9ed9a 100644
--- a/tacker/tests/unit/vnflcm/test_sync_resource.py
+++ b/tacker/tests/unit/vnflcm/test_sync_resource.py
@@ -61,8 +61,8 @@ class TestSyncVnfPackage(base.TestCase):
             mock_glance_store):
 
         # glance_store mock Settings
-        mock_glance_store.return_value = 'location', 0, 'checksum',\
-                                         'multihash', 'loc_meta'
+        mock_glance_store.return_value = (
+            'location', 0, 'checksum', 'multihash', 'loc_meta')
 
         updates = {'additionalArtifacts': [
             {
@@ -254,8 +254,8 @@ class TestSyncVnfPackage(base.TestCase):
             mock_glance_store):
 
         # glance_store mock Settings
-        mock_glance_store.return_value = 'location', 0, 'checksum',\
-                                         'multihash', 'loc_meta'
+        mock_glance_store.return_value = (
+            'location', 0, 'checksum', 'multihash', 'loc_meta')
 
         # vnf_package mock Settings
         mock_save_vnf_package.side_effect = Exception
@@ -291,8 +291,8 @@ class TestSyncVnfPackage(base.TestCase):
             mock_glance_store):
 
         # glance_store mock Settings
-        mock_glance_store.return_value = 'location', 0, 'checksum',\
-                                         'multihash', 'loc_meta'
+        mock_glance_store.return_value = (
+            'location', 0, 'checksum', 'multihash', 'loc_meta')
         mock_upload_vnf_package_content.side_effect = Exception
 
         # SyncVnfPackage.create_package
@@ -327,8 +327,8 @@ class TestSyncVnfPackage(base.TestCase):
             mock_glance_store):
 
         # glance_store mock Settings
-        mock_glance_store.return_value = 'location', 0, 'checksum',\
-                                         'multihash', 'loc_meta'
+        mock_glance_store.return_value = (
+            'location', 0, 'checksum', 'multihash', 'loc_meta')
 
         # vnf_package_vnfd mock Settings
         mock_get_by_id.side_effect = Exception
diff --git a/tacker/tests/unit/vnfpkgm/test_controller.py b/tacker/tests/unit/vnfpkgm/test_controller.py
index 9480daeff..a0cac4ac1 100644
--- a/tacker/tests/unit/vnfpkgm/test_controller.py
+++ b/tacker/tests/unit/vnfpkgm/test_controller.py
@@ -735,8 +735,8 @@ class TestController(base.TestCase):
         vnf_package_obj = objects.VnfPackage(**vnf_package_dict)
         mock_vnf_by_id.return_value = vnf_package_obj
         mock_vnf_pack_save.return_value = vnf_package_obj
-        mock_glance_store.return_value = 'location', 0, 'checksum',\
-                                         'multihash', 'loc_meta'
+        mock_glance_store.return_value = (
+            'location', 0, 'checksum', 'multihash', 'loc_meta')
         req.headers['Content-Type'] = 'application/zip'
         req.method = 'PUT'
         req.body = jsonutils.dump_as_bytes({'dummy': {'val': 'foo'}})
diff --git a/tacker/vnfm/infra_drivers/kubernetes/kubernetes_driver.py b/tacker/vnfm/infra_drivers/kubernetes/kubernetes_driver.py
index 90e8995dd..01058bbd0 100644
--- a/tacker/vnfm/infra_drivers/kubernetes/kubernetes_driver.py
+++ b/tacker/vnfm/infra_drivers/kubernetes/kubernetes_driver.py
@@ -1250,13 +1250,13 @@ class Kubernetes(abstract_driver.VnfAbstractDriver,
         if not additional_params:
             return False
         use_helm = additional_params.get('use_helm')
-        if type(use_helm) == str:
+        if isinstance(use_helm, str):
             return use_helm.lower() == 'true'
         return bool(use_helm)
 
     def _is_exthelmchart(self, helm_install_params):
         exthelmchart = helm_install_params.get('exthelmchart')
-        if type(exthelmchart) == str:
+        if isinstance(exthelmchart, str):
             return exthelmchart.lower() == 'true'
         return bool(exthelmchart)
 
diff --git a/test-requirements.txt b/test-requirements.txt
index c56cde1a6..4a1eca6f1 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -8,7 +8,7 @@ coverage!=4.4,>=4.0 # Apache-2.0
 ddt>=1.0.1 # MIT
 doc8>=0.9.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
-hacking>=4.0.0,<4.1.0 # Apache-2.0
+hacking>=7.0.0,<7.1.0 # Apache-2.0
 python-subunit>=1.0.0 # Apache-2.0/BSD
 python-tackerclient>=0.8.0 # Apache-2.0
 python-cinderclient>=8.0.0 # Apache-2.0