diff --git a/doc/source/conf.py b/doc/source/conf.py
index 594c01ce6a..b7a16fbc70 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 #
 # Octavia documentation build configuration file, created by
 # sphinx-quickstart on Tue May 21 17:43:32 2013.
diff --git a/octavia/hacking/checks.py b/octavia/hacking/checks.py
index 70089940b2..eb0abc2558 100644
--- a/octavia/hacking/checks.py
+++ b/octavia/hacking/checks.py
@@ -37,10 +37,10 @@ _all_log_levels = {'critical', 'error', 'exception', 'info', 'warning'}
 _all_hints = {'_LC', '_LE', '_LI', '_', '_LW'}
 
 _log_translation_hint = re.compile(
-    r".*LOG\.(%(levels)s)\(\s*(%(hints)s)\(" % {
-        'levels': '|'.join(_all_log_levels),
-        'hints': '|'.join(_all_hints),
-    })
+    r".*LOG\.({levels})\(\s*({hints})\(".format(
+        levels='|'.join(_all_log_levels),
+        hints='|'.join(_all_hints),
+    ))
 
 assert_trueinst_re = re.compile(
     r"(.)*assertTrue\(isinstance\((\w|\.|\'|\"|\[|\])+, "
diff --git a/octavia/image/drivers/noop_driver/driver.py b/octavia/image/drivers/noop_driver/driver.py
index 10acf186ce..84ba69a6eb 100644
--- a/octavia/image/drivers/noop_driver/driver.py
+++ b/octavia/image/drivers/noop_driver/driver.py
@@ -19,7 +19,7 @@ from octavia.image import image_base as driver_base
 LOG = logging.getLogger(__name__)
 
 
-class NoopManager(object):
+class NoopManager:
     def __init__(self):
         super().__init__()
         self.imageconfig = {}
diff --git a/octavia/image/image_base.py b/octavia/image/image_base.py
index 3bb0af0d1c..eca84632ef 100644
--- a/octavia/image/image_base.py
+++ b/octavia/image/image_base.py
@@ -15,7 +15,7 @@
 import abc
 
 
-class ImageBase(object, metaclass=abc.ABCMeta):
+class ImageBase(metaclass=abc.ABCMeta):
 
     @abc.abstractmethod
     def get_image_id_by_tag(self, image_tag, image_owner=None):
diff --git a/octavia/network/base.py b/octavia/network/base.py
index 1480b55818..0a23434d40 100644
--- a/octavia/network/base.py
+++ b/octavia/network/base.py
@@ -86,7 +86,7 @@ class CreatePortException(NetworkException):
     pass
 
 
-class AbstractNetworkDriver(object, metaclass=abc.ABCMeta):
+class AbstractNetworkDriver(metaclass=abc.ABCMeta):
     """This class defines the methods for a fully functional network driver.
 
     Implementations of this interface can expect a rollback to occur if any of
diff --git a/octavia/network/drivers/neutron/allowed_address_pairs.py b/octavia/network/drivers/neutron/allowed_address_pairs.py
index 61334da91a..267e60b8c0 100644
--- a/octavia/network/drivers/neutron/allowed_address_pairs.py
+++ b/octavia/network/drivers/neutron/allowed_address_pairs.py
@@ -475,7 +475,9 @@ class AllowedAddressPairsDriver(neutron_base.BaseNeutronDriver):
         :param load_balancer: octavia.common.data_models.LoadBalancer instance
         :return: octavia.common.data_models.Vip,
                  list(octavia.common.data_models.AdditionalVip)
-        :raises: AllocateVIPException, PortNotFound, SubnetNotFound
+        :raises AllocateVIPException: generic error allocating the VIP
+        :raises PortNotFound: port was not found
+        :raises SubnetNotFound: subnet was not found
         """
         if load_balancer.vip.port_id:
             try:
@@ -500,7 +502,7 @@ class AllowedAddressPairsDriver(neutron_base.BaseNeutronDriver):
                     self.delete_port(load_balancer.vip.port_id)
                 else:
                     raise base.AllocateVIPException(
-                        'VIP port {0} is broken, but is owned by project {1} '
+                        'VIP port {} is broken, but is owned by project {} '
                         'so will not be recreated. Aborting VIP allocation.'
                         .format(port.id, port.project_id))
             except base.AllocateVIPException as e:
@@ -552,7 +554,7 @@ class AllowedAddressPairsDriver(neutron_base.BaseNeutronDriver):
             constants.NAME: 'octavia-lb-' + load_balancer.id,
             constants.NETWORK_ID: load_balancer.vip.network_id,
             constants.ADMIN_STATE_UP: False,
-            'device_id': 'lb-{0}'.format(load_balancer.id),
+            'device_id': f'lb-{load_balancer.id}',
             constants.DEVICE_OWNER: constants.OCTAVIA_OWNER,
             project_id_key: load_balancer.project_id}
 
@@ -615,7 +617,7 @@ class AllowedAddressPairsDriver(neutron_base.BaseNeutronDriver):
         try:
             subnet = self.get_subnet(vip.subnet_id)
         except base.SubnetNotFound as e:
-            msg = ("Can't unplug vip because vip subnet {0} was not "
+            msg = ("Can't unplug vip because vip subnet {} was not "
                    "found").format(vip.subnet_id)
             LOG.exception(msg)
             raise base.PluggedVIPNotFound(msg) from e
diff --git a/octavia/network/drivers/noop_driver/driver.py b/octavia/network/drivers/noop_driver/driver.py
index be3b4e7ebd..96c174b12e 100644
--- a/octavia/network/drivers/noop_driver/driver.py
+++ b/octavia/network/drivers/noop_driver/driver.py
@@ -31,7 +31,7 @@ _NOOP_MANAGER_VARS = {
 }
 
 
-class NoopManager(object):
+class NoopManager:
 
     def __init__(self):
         super().__init__()
diff --git a/octavia/statistics/stats_base.py b/octavia/statistics/stats_base.py
index e11faf67a7..5a8db5697f 100644
--- a/octavia/statistics/stats_base.py
+++ b/octavia/statistics/stats_base.py
@@ -48,7 +48,7 @@ def update_stats_via_driver(listener_stats, deltas=False):
     handlers.map_method('update_stats', listener_stats, deltas=deltas)
 
 
-class StatsDriverMixin(object, metaclass=abc.ABCMeta):
+class StatsDriverMixin(metaclass=abc.ABCMeta):
     @abc.abstractmethod
     def update_stats(self, listener_stats, deltas=False):
         """Return a stats object formatted for a generic backend
diff --git a/octavia/volume/drivers/noop_driver/driver.py b/octavia/volume/drivers/noop_driver/driver.py
index c046c0009f..65b2821064 100644
--- a/octavia/volume/drivers/noop_driver/driver.py
+++ b/octavia/volume/drivers/noop_driver/driver.py
@@ -18,7 +18,7 @@ from octavia.volume import volume_base as driver_base
 LOG = logging.getLogger(__name__)
 
 
-class NoopManager(object):
+class NoopManager:
     def __init__(self):
         super().__init__()
         self.volumeconfig = {}
diff --git a/octavia/volume/volume_base.py b/octavia/volume/volume_base.py
index c2f43aba2e..d71e8d01d6 100644
--- a/octavia/volume/volume_base.py
+++ b/octavia/volume/volume_base.py
@@ -15,7 +15,7 @@
 import abc
 
 
-class VolumeBase(object, metaclass=abc.ABCMeta):
+class VolumeBase(metaclass=abc.ABCMeta):
 
     @abc.abstractmethod
     def create_volume_from_image(self, image_id):
diff --git a/releasenotes/source/conf.py b/releasenotes/source/conf.py
index f11d92b513..c88b39272a 100644
--- a/releasenotes/source/conf.py
+++ b/releasenotes/source/conf.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
diff --git a/tools/create_flow_docs.py b/tools/create_flow_docs.py
index aad6f28985..9fcccade27 100755
--- a/tools/create_flow_docs.py
+++ b/tools/create_flow_docs.py
@@ -44,7 +44,7 @@ def generate(flow_list, output_directory):
     base_path = os.path.join(os.path.dirname(os.path.realpath(__file__)),
                              os.path.pardir)
     diagram_list = []
-    with open(os.path.join(base_path, flow_list), 'r') as flowlist:
+    with open(os.path.join(base_path, flow_list)) as flowlist:
         for row in flowlist:
             if row.startswith('#'):
                 continue
diff --git a/tools/pkcs7_to_pem.py b/tools/pkcs7_to_pem.py
index 19e3d42251..df0515811b 100755
--- a/tools/pkcs7_to_pem.py
+++ b/tools/pkcs7_to_pem.py
@@ -60,7 +60,7 @@ def _read_pem_blocks(data, *markers):
             else:
                 certLines.append(certLine)
         if state == stDump:
-            yield ''.encode().join([
+            yield b''.join([
                 base64.b64decode(x) for x in certLines])
             state = stSpam