diff --git a/tempest/api/volume/admin/test_volume_types_extra_specs.py b/tempest/api/volume/admin/test_volume_types_extra_specs.py
index a45bee0672..b5c5d156ab 100644
--- a/tempest/api/volume/admin/test_volume_types_extra_specs.py
+++ b/tempest/api/volume/admin/test_volume_types_extra_specs.py
@@ -54,20 +54,19 @@ class VolumeTypesExtraSpecsV2Test(base.BaseVolumeAdminTest):
             self.volume_type['id'], extra_specs)['extra_specs']
         self.assertEqual(extra_specs, body,
                          "Volume type extra spec incorrectly created")
-
-        extra_spec = {"spec2": "val2"}
+        spec_key = "spec2"
+        extra_spec = {spec_key: "val2"}
         body = self.admin_volume_types_client.update_volume_type_extra_specs(
-            self.volume_type['id'],
-            extra_spec.keys()[0],
-            extra_spec)
-        self.assertIn('spec2', body)
-        self.assertEqual(extra_spec['spec2'], body['spec2'],
+            self.volume_type['id'], spec_key, extra_spec)
+        self.assertIn(spec_key, body)
+        self.assertEqual(extra_spec[spec_key], body[spec_key],
                          "Volume type extra spec incorrectly updated")
 
     @test.idempotent_id('d4772798-601f-408a-b2a5-29e8a59d1220')
     def test_volume_type_extra_spec_create_get_delete(self):
         # Create/Get/Delete volume type extra spec.
-        extra_specs = {"spec3": "val1"}
+        spec_key = "spec3"
+        extra_specs = {spec_key: "val1"}
         body = self.admin_volume_types_client.create_volume_type_extra_specs(
             self.volume_type['id'],
             extra_specs)['extra_specs']
@@ -76,13 +75,11 @@ class VolumeTypesExtraSpecsV2Test(base.BaseVolumeAdminTest):
 
         self.admin_volume_types_client.show_volume_type_extra_specs(
             self.volume_type['id'],
-            extra_specs.keys()[0])
+            spec_key)
         self.assertEqual(extra_specs, body,
                          "Volume type extra spec incorrectly fetched")
-
         self.admin_volume_types_client.delete_volume_type_extra_specs(
-            self.volume_type['id'],
-            extra_specs.keys()[0])
+            self.volume_type['id'], spec_key)
 
 
 class VolumeTypesExtraSpecsV1Test(VolumeTypesExtraSpecsV2Test):
diff --git a/tempest/api/volume/admin/test_volume_types_extra_specs_negative.py b/tempest/api/volume/admin/test_volume_types_extra_specs_negative.py
index 69839742a5..c7c3e1ace3 100644
--- a/tempest/api/volume/admin/test_volume_types_extra_specs_negative.py
+++ b/tempest/api/volume/admin/test_volume_types_extra_specs_negative.py
@@ -38,11 +38,10 @@ class ExtraSpecsNegativeV2Test(base.BaseVolumeAdminTest):
     @test.idempotent_id('08961d20-5cbb-4910-ac0f-89ad6dbb2da1')
     def test_update_no_body(self):
         # Should not update volume type extra specs with no body
-        extra_spec = {"spec1": "val2"}
         self.assertRaises(
             lib_exc.BadRequest,
             self.admin_volume_types_client.update_volume_type_extra_specs,
-            self.volume_type['id'], extra_spec.keys()[0], None)
+            self.volume_type['id'], "spec1", None)
 
     @test.idempotent_id('25e5a0ee-89b3-4c53-8310-236f76c75365')
     def test_update_nonexistent_extra_spec_id(self):
@@ -71,7 +70,7 @@ class ExtraSpecsNegativeV2Test(base.BaseVolumeAdminTest):
         self.assertRaises(
             lib_exc.BadRequest,
             self.admin_volume_types_client.update_volume_type_extra_specs,
-            self.volume_type['id'], extra_spec.keys()[0],
+            self.volume_type['id'], list(extra_spec)[0],
             extra_spec)
 
     @test.idempotent_id('49d5472c-a53d-4eab-a4d3-450c4db1c545')
@@ -103,12 +102,11 @@ class ExtraSpecsNegativeV2Test(base.BaseVolumeAdminTest):
     @test.idempotent_id('031cda8b-7d23-4246-8bf6-bbe73fd67074')
     def test_delete_nonexistent_volume_type_id(self):
         # Should not delete volume type extra spec for nonexistent
-            # type id.
-        extra_specs = {"spec1": "val1"}
+        # type id.
         self.assertRaises(
             lib_exc.NotFound,
             self.admin_volume_types_client.delete_volume_type_extra_specs,
-            data_utils.rand_uuid(), extra_specs.keys()[0])
+            data_utils.rand_uuid(), "spec1")
 
     @test.idempotent_id('dee5cf0c-cdd6-4353-b70c-e847050d71fb')
     def test_list_nonexistent_volume_type_id(self):
@@ -121,11 +119,10 @@ class ExtraSpecsNegativeV2Test(base.BaseVolumeAdminTest):
     @test.idempotent_id('9f402cbd-1838-4eb4-9554-126a6b1908c9')
     def test_get_nonexistent_volume_type_id(self):
         # Should not get volume type extra spec for nonexistent type id.
-        extra_specs = {"spec1": "val1"}
         self.assertRaises(
             lib_exc.NotFound,
             self.admin_volume_types_client.show_volume_type_extra_specs,
-            data_utils.rand_uuid(), extra_specs.keys()[0])
+            data_utils.rand_uuid(), "spec1")
 
     @test.idempotent_id('c881797d-12ff-4f1a-b09d-9f6212159753')
     def test_get_nonexistent_extra_spec_id(self):
diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index dd6e0e50dc..69da1c9f71 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -1037,7 +1037,7 @@ class NetworkScenarioTest(ScenarioTest):
         if not tenant_id:
             tenant_id = client.tenant_id
         sgs = [
-            sg for sg in client.list_security_groups().values()[0]
+            sg for sg in list(client.list_security_groups().values())[0]
             if sg['tenant_id'] == tenant_id and sg['name'] == 'default'
         ]
         msg = "No default security group for tenant %s." % (tenant_id)