diff --git a/config_tempest/main.py b/config_tempest/main.py
index 90781588..76ba531a 100755
--- a/config_tempest/main.py
+++ b/config_tempest/main.py
@@ -175,12 +175,10 @@ def set_options(conf, deployer_input, non_admin, image_path, overrides=[],
     conf.set('image', 'image_path', image_path)
 
     if deployer_input and os.path.isfile(deployer_input):
-        LOG.info("Reading deployer input from file {}".format(
-            deployer_input))
+        LOG.info("Reading deployer input from file %s", deployer_input)
         read_deployer_input(deployer_input, conf)
     elif os.path.isfile(C.DEPLOYER_INPUT) and not no_default_deployer:
-        LOG.info("Reading deployer input from file {}".format(
-            C.DEPLOYER_INPUT))
+        LOG.info("Reading deployer input from file %s", C.DEPLOYER_INPUT)
         read_deployer_input(C.DEPLOYER_INPUT, conf)
 
     if non_admin:
diff --git a/config_tempest/services/network.py b/config_tempest/services/network.py
index 5f11b901..52ab38de 100644
--- a/config_tempest/services/network.py
+++ b/config_tempest/services/network.py
@@ -49,8 +49,8 @@ class NetworkService(VersionedService):
         return 'api_extensions'
 
     def _supplied_network(self):
-        LOG.info("Looking for existing network id: {0}"
-                 "".format(self._public_network_id))
+        LOG.info("Looking for existing network id: %s",
+                 self._public_network_id)
         # check if network exists
         network_list = self.client.list_networks()
         for network in network_list['networks']:
@@ -66,7 +66,7 @@ class NetworkService(VersionedService):
         network_list = self.client.list_networks()
         for network in network_list['networks']:
             if network['router:external'] and network['subnets']:
-                LOG.info("Found network, using: {0}".format(network['id']))
+                LOG.info("Found network, using: %s", network['id'])
                 self._public_network_id = network['id']
                 self._public_network_name = network['name']
                 break
diff --git a/config_tempest/services/services.py b/config_tempest/services/services.py
index 1dd2648b..9b887692 100644
--- a/config_tempest/services/services.py
+++ b/config_tempest/services/services.py
@@ -100,8 +100,7 @@ class Services(object):
                     service_data = self.get_service_data(s_name, s_type)
                     url = None
                     if not service_data:
-                        C.LOG.warning('No endpoint data found for {}'.format(
-                            s_name))
+                        C.LOG.warning('No endpoint data found for %s', s_name)
                     else:
                         url = self.parse_endpoints(self.get_endpoints(
                             service_data), s_type)
diff --git a/config_tempest/tests/test_tempest_conf.py b/config_tempest/tests/test_tempest_conf.py
index 7ea2de3a..93c034d1 100644
--- a/config_tempest/tests/test_tempest_conf.py
+++ b/config_tempest/tests/test_tempest_conf.py
@@ -96,9 +96,9 @@ class TestTempestConf(BaseConfigTempestTest):
         conf_exts = conf_exts.split(',')
         for ext in api_exts.split(','):
             if ext in remove_exts:
-                self.assertFalse(ext in conf_exts)
+                self.assertNotIn(ext, conf_exts)
             else:
-                self.assertTrue(ext in conf_exts)
+                self.assertIn(ext, conf_exts)
 
     def test_remove_values_having_hyphen(self):
         api_exts = "dvr,l3-flavors,rbac-policies,project-id"
@@ -113,9 +113,9 @@ class TestTempestConf(BaseConfigTempestTest):
         conf_exts = conf_exts.split(',')
         for ext in api_exts.split(','):
             if ext in remove_exts:
-                self.assertFalse(ext in conf_exts)
+                self.assertNotIn(ext, conf_exts)
             else:
-                self.assertTrue(ext in conf_exts)
+                self.assertIn(ext, conf_exts)
 
     @mock.patch('config_tempest.tempest_conf.C.LOG')
     def test_remove_not_defined_values(self, mock_logging):
@@ -138,7 +138,7 @@ class TestTempestConf(BaseConfigTempestTest):
         conf_exts = self.conf.get("compute-feature-enabled", "api_extensions")
         conf_exts = conf_exts.split(',')
         self.assertEqual(len(conf_exts), 4)
-        self.assertTrue("project-id" in conf_exts)
+        self.assertIn("project-id", conf_exts)
 
     def test_append_values_with_overrides(self):
         # Test if --add option can override an option which was
@@ -159,7 +159,7 @@ class TestTempestConf(BaseConfigTempestTest):
         # if there are still 3 extensions, no new was added
         self.assertEqual(len(conf_exts), 3)
         # option added via --add shouldn't be there
-        self.assertFalse("project-id" in conf_exts)
-        self.assertTrue("dvr" in conf_exts)
-        self.assertTrue("l3-flavors" in conf_exts)
-        self.assertTrue("rbac-policies" in conf_exts)
+        self.assertNotIn("project-id", conf_exts)
+        self.assertIn("dvr", conf_exts)
+        self.assertIn("l3-flavors", conf_exts)
+        self.assertIn("rbac-policies", conf_exts)