diff --git a/brian_polling_manager/cli.py b/brian_polling_manager/cli.py
index ea01e1ac5367d25b1aafc49d9777a40386eb2779..6711ed41ade9b6cb233016a94b562a2cafbb1ab7 100644
--- a/brian_polling_manager/cli.py
+++ b/brian_polling_manager/cli.py
@@ -54,7 +54,9 @@ _DEFAULT_CONFIG = {
             'output_metric_handlers': ['influx-db-handler'],
             'namespace': 'default',
             'round_robin': True,
-            'command': '{script} {measurement} {community} {hostname} {interface} {ifIndex}',
+            'command': ('{script} {measurement} '
+                        '{community} {hostname} '
+                        '{interface} {ifIndex}'),
         }
     },
     'statedir': '/tmp/'
@@ -166,12 +168,16 @@ class State(object):
 
     @property
     def interfaces(self) -> list:
-        return State._load_json(self.filenames['cache'], inventory.INVENTORY_INTERFACES_SCHEMA)
+        return State._load_json(
+            self.filenames['cache'],
+            inventory.INVENTORY_INTERFACES_SCHEMA)
 
     @interfaces.setter
     def interfaces(self, new_interfaces):
         try:
-            jsonschema.validate(new_interfaces, inventory.INVENTORY_INTERFACES_SCHEMA)
+            jsonschema.validate(
+                new_interfaces,
+                inventory.INVENTORY_INTERFACES_SCHEMA)
         except jsonschema.ValidationError:
             logger.exception('invalid interface state data')
             return
diff --git a/brian_polling_manager/interfaces.py b/brian_polling_manager/interfaces.py
index f50b975cafd3a0fa87b8926505682d96c73bd1e7..4c47e5969b38bc578c27d1a5b6be7e3688fa0026 100644
--- a/brian_polling_manager/interfaces.py
+++ b/brian_polling_manager/interfaces.py
@@ -5,12 +5,13 @@ from brian_polling_manager import sensu
 
 logger = logging.getLogger(__name__)
 
+
 def load_ifc_checks(sensu_params):
     def _is_ifc_check(check):
         name = check['metadata']['name']
         return re.match(r'^check-([^-]+\.geant\.net)-(.+)$', name)
     ifc_checks = filter(_is_ifc_check, sensu.load_all_checks(sensu_params))
-    return {c['metadata']['name']:c for c in ifc_checks}
+    return {c['metadata']['name']: c for c in ifc_checks}
 
 
 def _check_name(interface):
@@ -35,7 +36,8 @@ def _make_check(check_params, interface):
         'proxy_entity_name': interface['router'],
         'round_robin': check_params['round_robin'],
         'output_metric_format': 'influxdb_line',
-        'output_metric_handlers': sorted(check_params['output_metric_handlers']),
+        'output_metric_handlers': sorted(
+            check_params['output_metric_handlers']),
         'metadata': {
             'name': _check_name(interface),
             'namespace': check_params['namespace']
@@ -56,7 +58,8 @@ def _checks_match(a, b) -> bool:
         return False
     if sorted(a['subscriptions']) != sorted(b['subscriptions']):
         return False
-    if sorted(a['output_metric_handlers']) != sorted(b['output_metric_handlers']):
+    if sorted(a['output_metric_handlers']) \
+            != sorted(b['output_metric_handlers']):
         return False
     if a['metadata']['name'] != b['metadata']['name']:
         return False
@@ -71,7 +74,8 @@ def refresh(sensu_params, state):
 
     for interface in state.interfaces:
 
-        expected_check = _make_check(sensu_params['interface-check'], interface)
+        expected_check = _make_check(
+            sensu_params['interface-check'], interface)
 
         expected_name = _check_name(interface)
         if expected_name not in ifc_checks:
diff --git a/docs/source/conf.py b/docs/source/conf.py
index b09ad6206684687a155098f75421e9d955f763b4..2db47d2af9be401adc20354305d350e8eb9ef255 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -27,6 +27,7 @@ sys.path.insert(0, os.path.abspath(
         os.path.dirname(__file__),
         '..', '..', 'brian_polling_manager')))
 
+
 class RenderAsJSON(Directive):
     # cf. https://stackoverflow.com/a/59883833
 
@@ -97,4 +98,3 @@ html_static_path = ['_static']
 # are concatenated and inserted.
 autoclass_content = "both"
 autodoc_typehints = "none"
-
diff --git a/setup.py b/setup.py
index f53e1c4118a819da753048aed7516a17c33f3bee..0189d12398684ac8e477511cf99253e2189a75dd 100644
--- a/setup.py
+++ b/setup.py
@@ -19,4 +19,3 @@ setup(
         ]
     },
 )
-
diff --git a/test/conftest.py b/test/conftest.py
index ea94ef8e3d16ea45a570671607994f04636a94cb..9d1320066b0b6b27fa4034e5afdb6ac8af71605c 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -41,7 +41,9 @@ def config():
                     'output_metric_handlers': ['influx-db-handler'],
                     'namespace': 'default',
                     'round_robin': True,
-                    'command': '{script} {measurement} {community} {hostname} {interface} {ifIndex}',
+                    'command': ('{script} {measurement} '
+                                '{community} {hostname} '
+                                '{interface} {ifIndex}'),
                 }
             },
             'statedir': state_dir_name
@@ -66,7 +68,10 @@ def mocked_sensu():
             'proxy_entity_name': {'type': 'string'},
             'round_robin': {'type': 'boolean'},
             'output_metric_format': {'enum': ['influxdb_line']},
-            'output_metric_handlers': {'type': 'array', 'items': {'type': 'string'}},
+            'output_metric_handlers': {
+                'type': 'array',
+                'items': {'type': 'string'}
+            },
             'metadata': {
                 'type': 'object',
                 'properties': {
@@ -122,7 +127,8 @@ def mocked_sensu():
     # mocked api for updating a check
     responses.add_callback(
         method=responses.PUT,
-        url=re.compile(r'.*sensu.+/api/core/v2/namespaces/[^\/]+/checks/[^\/]+$'),
+        url=re.compile(
+            r'.*sensu.+/api/core/v2/namespaces/[^\/]+/checks/[^\/]+$'),
         callback=update_check_callback)
 
     def delete_check_callback(request):
@@ -134,7 +140,8 @@ def mocked_sensu():
     # mocked api for deleting a check
     responses.add_callback(
         method=responses.DELETE,
-        url=re.compile(r'.*sensu.+/api/core/v2/namespaces/[^\/]+/checks/[^\/]+$'),
+        url=re.compile(
+            r'.*sensu.+/api/core/v2/namespaces/[^\/]+/checks/[^\/]+$'),
         callback=delete_check_callback)
 
     yield saved_sensu_checks
diff --git a/test/test_sensu_checks.py b/test/test_sensu_checks.py
index fef3645f040eee394f156c07405b7ebf553ea188..7a5a8178cfd72ff4d3d6a1899b1d1012e45f5df4 100644
--- a/test/test_sensu_checks.py
+++ b/test/test_sensu_checks.py
@@ -15,7 +15,8 @@ def test_load_checks(config, mocked_sensu):
 @responses.activate
 def test_check_lifecycle(config, mocked_sensu, mocked_inventory):
 
-    test_interface = random.choice(inventory.load_interfaces(config['inventory']))
+    test_interface = random.choice(
+        inventory.load_interfaces(config['inventory']))
     test_interface['name'] = 'xyz'
 
     new_check = interfaces._make_check(