diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index ef4bdd8..3e2abca 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -9,3 +9,8 @@ repos:
     rev: 5.5.2
     hooks:
       - id: isort
+
+  - repo: https://gitlab.com/pycqa/flake8
+    rev: 3.8.3
+    hooks:
+      - id: flake8
diff --git a/conftest.py b/conftest.py
index f991321..ec45369 100644
--- a/conftest.py
+++ b/conftest.py
@@ -1,5 +1,4 @@
 import importlib
-import sys
 import unittest
 
 import _pytest.unittest
@@ -81,8 +80,8 @@ def pytest_collection_modifyitems(session, config, items):
         # and that node references the UnitTest class
         assert issubclass(item.parent.cls, unittest.TestCase)
 
-        # and in this project, TestCase classes all inherit either from BaseClientController
-        # or BaseServerController.
+        # and in this project, TestCase classes all inherit either from
+        # BaseClientController or BaseServerController.
         if issubclass(item.parent.cls, BaseServerTestCase):
             if server_tests:
                 filtered_items.append(item)
diff --git a/irctest/basecontrollers.py b/irctest/basecontrollers.py
index aaaf67d..92366eb 100644
--- a/irctest/basecontrollers.py
+++ b/irctest/basecontrollers.py
@@ -147,5 +147,5 @@ class BaseServerController(_BaseController):
 
                 c.close()
                 self.port_open = True
-            except Exception as e:
+            except Exception:
                 continue
diff --git a/irctest/cases.py b/irctest/cases.py
index 0f3b75f..47b26ad 100644
--- a/irctest/cases.py
+++ b/irctest/cases.py
@@ -58,15 +58,9 @@ class _IrcTestCase(unittest.TestCase):
         method_doc = self._testMethodDoc
         if not method_doc:
             return ""
-        return (
-            "\t"
-            + normalizeWhitespace(
-                method_doc,
-                removeNewline=False,
-            )
-            .strip()
-            .replace("\n ", "\n\t")
-        )
+        return "\t" + normalizeWhitespace(
+            method_doc, removeNewline=False
+        ).strip().replace("\n ", "\n\t")
 
     def setUp(self):
         super().setUp()
@@ -229,10 +223,7 @@ class ClientNegociationHelper:
     def readCapLs(self, auth=None, tls_config=None):
         (hostname, port) = self.server.getsockname()
         self.controller.run(
-            hostname=hostname,
-            port=port,
-            auth=auth,
-            tls_config=tls_config,
+            hostname=hostname, port=port, auth=auth, tls_config=tls_config
         )
         self.acceptClient()
         m = self.getMessage()
diff --git a/irctest/client_tests/test_sasl.py b/irctest/client_tests/test_sasl.py
index 81743a0..9c6d256 100644
--- a/irctest/client_tests/test_sasl.py
+++ b/irctest/client_tests/test_sasl.py
@@ -1,8 +1,7 @@
 import base64
-import hashlib
 
 import ecdsa
-from ecdsa.util import sigdecode_der, sigencode_der
+from ecdsa.util import sigdecode_der
 
 try:
     import pyxmpp2_scram as scram
diff --git a/irctest/client_tests/test_tls.py b/irctest/client_tests/test_tls.py
index 34be0e0..a317cd1 100644
--- a/irctest/client_tests/test_tls.py
+++ b/irctest/client_tests/test_tls.py
@@ -3,7 +3,6 @@ import ssl
 
 from irctest import cases, tls
 from irctest.exceptions import ConnectionClosed
-from irctest.irc_utils.message_parser import Message
 
 BAD_CERT = """
 -----BEGIN CERTIFICATE-----
@@ -120,26 +119,20 @@ class TlsTestCase(cases.BaseClientTestCase):
         tls_config = tls.TlsConfig(enable=True, trusted_fingerprints=[GOOD_FINGERPRINT])
         (hostname, port) = self.server.getsockname()
         self.controller.run(
-            hostname=hostname,
-            port=port,
-            auth=None,
-            tls_config=tls_config,
+            hostname=hostname, port=port, auth=None, tls_config=tls_config
         )
         self.acceptClient(tls_cert=GOOD_CERT, tls_key=GOOD_KEY)
-        m = self.getMessage()
+        self.getMessage()
 
     def testUntrustedCertificate(self):
         tls_config = tls.TlsConfig(enable=True, trusted_fingerprints=[GOOD_FINGERPRINT])
         (hostname, port) = self.server.getsockname()
         self.controller.run(
-            hostname=hostname,
-            port=port,
-            auth=None,
-            tls_config=tls_config,
+            hostname=hostname, port=port, auth=None, tls_config=tls_config
         )
         self.acceptClient(tls_cert=BAD_CERT, tls_key=BAD_KEY)
         with self.assertRaises((ConnectionClosed, ConnectionResetError)):
-            m = self.getMessage()
+            self.getMessage()
 
 
 class StsTestCase(cases.BaseClientTestCase, cases.OptionalityHelper):
@@ -162,10 +155,7 @@ class StsTestCase(cases.BaseClientTestCase, cases.OptionalityHelper):
         # Connect client to insecure server
         (hostname, port) = self.insecure_server.getsockname()
         self.controller.run(
-            hostname=hostname,
-            port=port,
-            auth=None,
-            tls_config=tls_config,
+            hostname=hostname, port=port, auth=None, tls_config=tls_config
         )
         self.acceptClient(server=self.insecure_server)
 
@@ -194,10 +184,7 @@ class StsTestCase(cases.BaseClientTestCase, cases.OptionalityHelper):
 
         # Run the client, still configured to connect to the insecure server
         self.controller.run(
-            hostname=hostname,
-            port=port,
-            auth=None,
-            tls_config=tls_config,
+            hostname=hostname, port=port, auth=None, tls_config=tls_config
         )
 
         # The client should remember the STS policy and connect to the secure
@@ -208,11 +195,7 @@ class StsTestCase(cases.BaseClientTestCase, cases.OptionalityHelper):
     def testStsInvalidCertificate(self):
         # Connect client to insecure server
         (hostname, port) = self.insecure_server.getsockname()
-        self.controller.run(
-            hostname=hostname,
-            port=port,
-            auth=None,
-        )
+        self.controller.run(hostname=hostname, port=port, auth=None)
         self.acceptClient(server=self.insecure_server)
 
         # Send STS policy to client
diff --git a/irctest/controllers/charybdis.py b/irctest/controllers/charybdis.py
index 1336155..4886abf 100644
--- a/irctest/controllers/charybdis.py
+++ b/irctest/controllers/charybdis.py
@@ -1,10 +1,6 @@
 import os
-import shutil
 import subprocess
-import tempfile
-import time
 
-from irctest import authentication, client_mock
 from irctest.basecontrollers import (
     BaseServerController,
     DirectoryBasedController,
@@ -74,9 +70,7 @@ class CharybdisController(BaseServerController, DirectoryBasedController):
         if ssl:
             self.gen_ssl()
             ssl_config = TEMPLATE_SSL_CONFIG.format(
-                key_path=self.key_path,
-                pem_path=self.pem_path,
-                dh_path=self.dh_path,
+                key_path=self.key_path, pem_path=self.pem_path, dh_path=self.dh_path
             )
         else:
             ssl_config = ""
diff --git a/irctest/controllers/hybrid.py b/irctest/controllers/hybrid.py
index c277259..7eed360 100644
--- a/irctest/controllers/hybrid.py
+++ b/irctest/controllers/hybrid.py
@@ -1,10 +1,6 @@
 import os
-import shutil
 import subprocess
-import tempfile
-import time
 
-from irctest import authentication, client_mock
 from irctest.basecontrollers import (
     BaseServerController,
     DirectoryBasedController,
@@ -72,9 +68,7 @@ class HybridController(BaseServerController, DirectoryBasedController):
         if ssl:
             self.gen_ssl()
             ssl_config = TEMPLATE_SSL_CONFIG.format(
-                key_path=self.key_path,
-                pem_path=self.pem_path,
-                dh_path=self.dh_path,
+                key_path=self.key_path, pem_path=self.pem_path, dh_path=self.dh_path
             )
         else:
             ssl_config = ""
diff --git a/irctest/controllers/inspircd.py b/irctest/controllers/inspircd.py
index 9ead13f..1ff5e87 100644
--- a/irctest/controllers/inspircd.py
+++ b/irctest/controllers/inspircd.py
@@ -1,10 +1,6 @@
 import os
-import shutil
 import subprocess
-import tempfile
-import time
 
-from irctest import authentication
 from irctest.basecontrollers import (
     BaseServerController,
     DirectoryBasedController,
@@ -62,9 +58,7 @@ class InspircdController(BaseServerController, DirectoryBasedController):
         if ssl:
             self.gen_ssl()
             ssl_config = TEMPLATE_SSL_CONFIG.format(
-                key_path=self.key_path,
-                pem_path=self.pem_path,
-                dh_path=self.dh_path,
+                key_path=self.key_path, pem_path=self.pem_path, dh_path=self.dh_path
             )
         else:
             ssl_config = ""
diff --git a/irctest/controllers/limnoria.py b/irctest/controllers/limnoria.py
index 1b74143..309226e 100644
--- a/irctest/controllers/limnoria.py
+++ b/irctest/controllers/limnoria.py
@@ -2,11 +2,7 @@ import os
 import subprocess
 
 from irctest import authentication, tls
-from irctest.basecontrollers import (
-    BaseClientController,
-    DirectoryBasedController,
-    NotImplementedByController,
-)
+from irctest.basecontrollers import BaseClientController, DirectoryBasedController
 
 TEMPLATE_CONFIG = """
 supybot.directories.conf: {directory}/conf
diff --git a/irctest/controllers/mammon.py b/irctest/controllers/mammon.py
index 54bcd00..4601664 100644
--- a/irctest/controllers/mammon.py
+++ b/irctest/controllers/mammon.py
@@ -1,6 +1,5 @@
 import os
 import subprocess
-import time
 
 from irctest.basecontrollers import (
     BaseServerController,
@@ -62,16 +61,13 @@ server:
 """
 
 
-def make_list(l):
-    return "\n".join(map("  - {}".format, l))
+def make_list(list_):
+    return "\n".join(map("  - {}".format, list_))
 
 
 class MammonController(BaseServerController, DirectoryBasedController):
     software_name = "Mammon"
-    supported_sasl_mechanisms = {
-        "PLAIN",
-        "ECDSA-NIST256P-CHALLENGE",
-    }
+    supported_sasl_mechanisms = {"PLAIN", "ECDSA-NIST256P-CHALLENGE"}
     supported_capabilities = set()  # Not exhaustive
 
     def create_config(self):
@@ -115,7 +111,7 @@ class MammonController(BaseServerController, DirectoryBasedController):
         self.proc = subprocess.Popen(
             [
                 "mammond",
-                "--nofork",  #'--debug',
+                "--nofork",  # '--debug',
                 "--config",
                 os.path.join(self.directory, "server.yml"),
             ]
diff --git a/irctest/controllers/oragono.py b/irctest/controllers/oragono.py
index a025317..9c40830 100644
--- a/irctest/controllers/oragono.py
+++ b/irctest/controllers/oragono.py
@@ -12,9 +12,7 @@ from irctest.basecontrollers import (
 OPER_PWD = "frenchfries"
 
 BASE_CONFIG = {
-    "network": {
-        "name": "OragonoTest",
-    },
+    "network": {"name": "OragonoTest"},
     "server": {
         "name": "oragono.test",
         "listeners": {},
@@ -38,11 +36,7 @@ BASE_CONFIG = {
             "exempted": ["localhost"],
         },
         "enforce-utf8": True,
-        "relaymsg": {
-            "enabled": True,
-            "separators": "/",
-            "available-to-chanops": True,
-        },
+        "relaymsg": {"enabled": True, "separators": "/", "available-to-chanops": True},
     },
     "accounts": {
         "authentication-enabled": True,
@@ -63,30 +57,19 @@ BASE_CONFIG = {
             "method": "strict",
         },
     },
-    "channels": {
-        "registration": {
-            "enabled": True,
-        },
-    },
-    "datastore": {
-        "path": None,
-    },
+    "channels": {"registration": {"enabled": True}},
+    "datastore": {"path": None},
     "limits": {
         "awaylen": 200,
         "chan-list-modes": 60,
         "channellen": 64,
         "kicklen": 390,
-        "linelen": {
-            "rest": 2048,
-        },
+        "linelen": {"rest": 2048},
         "monitor-entries": 100,
         "nicklen": 32,
         "topiclen": 390,
         "whowas-entries": 100,
-        "multiline": {
-            "max-bytes": 4096,
-            "max-lines": 32,
-        },
+        "multiline": {"max-bytes": 4096, "max-lines": 32},
     },
     "history": {
         "enabled": True,
@@ -118,7 +101,7 @@ BASE_CONFIG = {
                 "chanreg",
                 "relaymsg",
             ],
-        },
+        }
     },
     "opers": {
         "root": {
@@ -126,19 +109,11 @@ BASE_CONFIG = {
             "whois-line": "is a server admin",
             # OPER_PWD
             "password": "$2a$04$3GzUZB5JapaAbwn7sogpOu9NSiLOgnozVllm2e96LiNPrm61ZsZSq",
-        },
+        }
     },
 }
 
-LOGGING_CONFIG = {
-    "logging": [
-        {
-            "method": "stderr",
-            "level": "debug",
-            "type": "*",
-        },
-    ]
-}
+LOGGING_CONFIG = {"logging": [{"method": "stderr", "level": "debug", "type": "*"}]}
 
 
 def hash_password(password):
@@ -155,9 +130,7 @@ def hash_password(password):
 
 class OragonoController(BaseServerController, DirectoryBasedController):
     software_name = "Oragono"
-    supported_sasl_mechanisms = {
-        "PLAIN",
-    }
+    supported_sasl_mechanisms = {"PLAIN"}
     _port_wait_interval = 0.01
     supported_capabilities = set()  # Not exhaustive
 
@@ -195,9 +168,7 @@ class OragonoController(BaseServerController, DirectoryBasedController):
             config = self.addMysqlToConfig(config)
 
         if enable_roleplay:
-            config["roleplay"] = {
-                "enabled": True,
-            }
+            config["roleplay"] = {"enabled": True}
 
         if "oragono_config" in self.test_config:
             self.test_config["oragono_config"](config)
@@ -208,9 +179,7 @@ class OragonoController(BaseServerController, DirectoryBasedController):
         if ssl:
             self.key_path = os.path.join(self.directory, "ssl.key")
             self.pem_path = os.path.join(self.directory, "ssl.pem")
-            listener_conf = {
-                "tls": {"cert": self.pem_path, "key": self.key_path},
-            }
+            listener_conf = {"tls": {"cert": self.pem_path, "key": self.key_path}}
         config["server"]["listeners"][bind_address] = listener_conf
 
         config["datastore"]["path"] = os.path.join(self.directory, "ircd.db")
diff --git a/irctest/controllers/sopel.py b/irctest/controllers/sopel.py
index 56f6129..4d867ff 100644
--- a/irctest/controllers/sopel.py
+++ b/irctest/controllers/sopel.py
@@ -11,7 +11,7 @@ host = {hostname}
 use_ssl = false
 port = {port}
 owner = me
-channels = 
+channels =
 timeout = 5
 auth_username = {username}
 auth_password = {password}
@@ -21,9 +21,7 @@ auth_password = {password}
 
 class SopelController(BaseClientController):
     software_name = "Sopel"
-    supported_sasl_mechanisms = {
-        "PLAIN",
-    }
+    supported_sasl_mechanisms = {"PLAIN"}
     supported_capabilities = set()  # Not exhaustive
 
     def __init__(self, test_config):
@@ -44,7 +42,7 @@ class SopelController(BaseClientController):
         return open(os.path.join(os.path.expanduser("~/.sopel/"), filename), mode)
 
     def create_config(self):
-        with self.open_file(self.filename) as fd:
+        with self.open_file(self.filename):
             pass
 
     def run(self, hostname, port, auth, tls_config):
diff --git a/irctest/irc_utils/capabilities.py b/irctest/irc_utils/capabilities.py
index fbbb569..c38fb9f 100644
--- a/irctest/irc_utils/capabilities.py
+++ b/irctest/irc_utils/capabilities.py
@@ -1,6 +1,6 @@
-def cap_list_to_dict(l):
+def cap_list_to_dict(caps):
     d = {}
-    for cap in l:
+    for cap in caps:
         if "=" in cap:
             (key, value) = cap.split("=", 1)
         else:
diff --git a/irctest/irc_utils/message_parser.py b/irctest/irc_utils/message_parser.py
index 3b68fd0..ea1f482 100644
--- a/irctest/irc_utils/message_parser.py
+++ b/irctest/irc_utils/message_parser.py
@@ -54,9 +54,4 @@ def parse_message(s):
         prefix = None
     command = tokens.pop(0)
     params = tokens
-    return Message(
-        tags=tags,
-        prefix=prefix,
-        command=command,
-        params=params,
-    )
+    return Message(tags=tags, prefix=prefix, command=command, params=params)
diff --git a/irctest/runner.py b/irctest/runner.py
index 4692813..5d45723 100644
--- a/irctest/runner.py
+++ b/irctest/runner.py
@@ -1,5 +1,4 @@
 import collections
-import operator
 import unittest
 
 
diff --git a/irctest/server_tests/test_away_notify.py b/irctest/server_tests/test_away_notify.py
index a494f30..06ea5f7 100644
--- a/irctest/server_tests/test_away_notify.py
+++ b/irctest/server_tests/test_away_notify.py
@@ -34,7 +34,8 @@ class AwayNotifyTestCase(cases.BaseServerTestCase, cases.OptionalityHelper):
     @cases.SpecificationSelector.requiredBySpecification("IRCv3.2")
     def testAwayNotifyOnJoin(self):
         """The away-notify specification states:
-        "Clients will be sent an AWAY message [...] when a user joins and has an away message set."
+        "Clients will be sent an AWAY message [...] when a user joins
+        and has an away message set."
         """
         self.connectClient("foo", capabilities=["away-notify"], skip_if_cap_nak=True)
         self.getMessages(1)
diff --git a/irctest/server_tests/test_cap.py b/irctest/server_tests/test_cap.py
index d90592a..d6a891a 100644
--- a/irctest/server_tests/test_cap.py
+++ b/irctest/server_tests/test_cap.py
@@ -10,7 +10,7 @@ class CapTestCase(cases.BaseServerTestCase):
         “Clients that support capabilities but do not wish to enter
         negotiation SHOULD send CAP END upon connection to the server.”
         -- <http://ircv3.net/specs/core/capability-negotiation-3.1.html#the-cap-end-subcommand>
-        """
+        """  # noqa
         self.addClient(1)
         self.sendLine(1, "CAP LS 302")
         self.getCapLs(1)
@@ -55,7 +55,7 @@ class CapTestCase(cases.BaseServerTestCase):
         first 100 characters of the capability list in the REQ subcommand which
         triggered the NAK.”
         -- <http://ircv3.net/specs/core/capability-negotiation-3.1.html#the-cap-nak-subcommand>
-        """
+        """  # noqa
         self.addClient(1)
         self.sendLine(1, "CAP LS 302")
         self.getCapLs(1)
@@ -77,7 +77,7 @@ class CapTestCase(cases.BaseServerTestCase):
         """“The capability identifier set must be accepted as a whole, or
         rejected entirely.”
         -- <http://ircv3.net/specs/core/capability-negotiation-3.1.html#the-cap-req-subcommand>
-        """
+        """  # noqa
         self.addClient(1)
         self.sendLine(1, "CAP LS 302")
         self.assertIn("multi-prefix", self.getCapLs(1))
diff --git a/irctest/server_tests/test_channel_operations.py b/irctest/server_tests/test_channel_operations.py
index 17d3198..177c778 100644
--- a/irctest/server_tests/test_channel_operations.py
+++ b/irctest/server_tests/test_channel_operations.py
@@ -51,10 +51,7 @@ class JoinTestCase(cases.BaseServerTestCase):
         self.connectClient("foo")
         self.sendLine(1, "JOIN #chan")
         received_commands = {m.command for m in self.getMessages(1)}
-        expected_commands = {
-            "353",  # RPL_NAMREPLY
-            "366",  # RPL_ENDOFNAMES
-        }
+        expected_commands = {"353", "366"}  # RPL_NAMREPLY  # RPL_ENDOFNAMES
         self.assertTrue(
             expected_commands.issubset(received_commands),
             "Server sent {} commands, but at least {} were expected.".format(
@@ -218,7 +215,8 @@ class JoinTestCase(cases.BaseServerTestCase):
         self.getMessages(2)
 
         self.sendLine(1, "PART #chan :bye everyone")
-        # both the PART'ing client and the other channel member should receive a PART line:
+        # both the PART'ing client and the other channel member should receive
+        # a PART line:
         m = self.getMessage(1)
         self.assertMessageEqual(m, command="PART", params=["#chan", "bye everyone"])
         m = self.getMessage(2)
@@ -463,7 +461,8 @@ class JoinTestCase(cases.BaseServerTestCase):
 
     @cases.SpecificationSelector.requiredBySpecification("RFC2812")
     def testKickPrivileges(self):
-        """Test who has the ability to kick / what error codes are sent for invalid kicks."""
+        """Test who has the ability to kick / what error codes are sent
+        for invalid kicks."""
         self.connectClient("foo")
         self.sendLine(1, "JOIN #chan")
         self.getMessages(1)
@@ -487,7 +486,8 @@ class JoinTestCase(cases.BaseServerTestCase):
             ERR_NOTONCHANNEL in replies
             or ERR_CHANOPRIVSNEEDED in replies
             or ERR_NOSUCHCHANNEL in replies,
-            f"did not receive acceptable error code for kick from outside channel: {replies}",
+            f"did not receive acceptable error code for kick from outside channel: "
+            f"{replies}",
         )
 
         self.joinChannel(3, "#chan")
@@ -604,15 +604,15 @@ class JoinTestCase(cases.BaseServerTestCase):
         self.getMessages(2)
         self.sendLine(1, "INVITE #chan bar")
         self.getMessages(1)
-        l = self.getMessages(2)
+        messages = self.getMessages(2)
         self.assertNotEqual(
-            l,
+            messages,
             [],
             fail_msg="After using “INVITE #chan bar” while #chan does "
             "not exist, “bar” received nothing.",
         )
         self.assertMessageEqual(
-            l[0],
+            messages[0],
             command="INVITE",
             params=["#chan", "bar"],
             fail_msg="After “foo” invited “bar” do non-existing channel "
@@ -636,15 +636,15 @@ class JoinTestCase(cases.BaseServerTestCase):
         self.getMessages(1)
         self.getMessages(2)
         self.sendLine(1, "INVITE #chan bar")
-        l = self.getMessages(1)
+        messages = self.getMessages(1)
         self.assertNotEqual(
-            l,
+            messages,
             [],
             fail_msg="After using “INVITE #chan bar” while #chan does "
             "not exist, the author received nothing.",
         )
         self.assertMessageEqual(
-            l[0],
+            messages[0],
             command="INVITE",
             params=["#chan", "bar"],
             fail_msg="After “foo” invited “bar” do non-existing channel "
@@ -891,24 +891,9 @@ class AuditoriumTestCase(cases.BaseServerTestCase):
             return result
 
         self.assertEqual(names("bar"), {"@bar", "guest1", "guest2", "guest3"})
-        self.assertEqual(
-            names("guest1"),
-            {
-                "@bar",
-            },
-        )
-        self.assertEqual(
-            names("guest2"),
-            {
-                "@bar",
-            },
-        )
-        self.assertEqual(
-            names("guest3"),
-            {
-                "@bar",
-            },
-        )
+        self.assertEqual(names("guest1"), {"@bar"})
+        self.assertEqual(names("guest2"), {"@bar"})
+        self.assertEqual(names("guest3"), {"@bar"})
 
         self.sendLine("bar", "MODE #auditorium +v guest1")
         modeLine = [msg for msg in self.getMessages("bar") if msg.command == "MODE"][0]
@@ -951,7 +936,8 @@ class AuditoriumTestCase(cases.BaseServerTestCase):
 class TopicPrivileges(cases.BaseServerTestCase):
     @cases.SpecificationSelector.requiredBySpecification("RFC2812")
     def testTopicPrivileges(self):
-        # test the +t channel mode, which prevents unprivileged users from changing the topic
+        # test the +t channel mode, which prevents unprivileged users
+        # from changing the topic
         self.connectClient("bar", name="bar")
         self.joinChannel("bar", "#chan")
         self.getMessages("bar")
diff --git a/irctest/server_tests/test_chathistory.py b/irctest/server_tests/test_chathistory.py
index ed978c7..77babda 100644
--- a/irctest/server_tests/test_chathistory.py
+++ b/irctest/server_tests/test_chathistory.py
@@ -35,9 +35,7 @@ def validate_chathistory_batch(msgs):
 class ChathistoryTestCase(cases.BaseServerTestCase):
     @staticmethod
     def config():
-        return {
-            "chathistory": True,
-        }
+        return {"chathistory": True}
 
     @cases.SpecificationSelector.requiredBySpecification("Oragono")
     def testInvalidTargets(self):
@@ -259,7 +257,8 @@ class ChathistoryTestCase(cases.BaseServerTestCase):
             ],
         )
 
-        # messages should be stored and retrievable by c1, even though c3 is not registered
+        # messages should be stored and retrievable by c1,
+        # even though c3 is not registered
         self.getMessages(1)
         self.sendLine(1, "CHATHISTORY LATEST %s * 10" % (c3,))
         results = [
@@ -277,7 +276,8 @@ class ChathistoryTestCase(cases.BaseServerTestCase):
         # regression test for #833
         self.sendLine(3, "QUIT")
         self.assertDisconnected(3)
-        # register c3 as an account, then attempt to retrieve the conversation history with c1
+        # register c3 as an account, then attempt to retrieve
+        # the conversation history with c1
         self.controller.registerUser(self, c3, "sesame3")
         self.connectClient(
             c3,
@@ -408,7 +408,8 @@ class ChathistoryTestCase(cases.BaseServerTestCase):
         result = validate_chathistory_batch(self.getMessages(user))
         self.assertEqual(echo_messages[1:-1], result)
 
-        # BETWEEN forwards and backwards with a limit, should get different results this time
+        # BETWEEN forwards and backwards with a limit, should get
+        # different results this time
         self.sendLine(
             user,
             "CHATHISTORY BETWEEN %s msgid=%s msgid=%s %d"
diff --git a/irctest/server_tests/test_connection_registration.py b/irctest/server_tests/test_connection_registration.py
index 40aa67d..8140aea 100644
--- a/irctest/server_tests/test_connection_registration.py
+++ b/irctest/server_tests/test_connection_registration.py
@@ -140,7 +140,7 @@ class ConnectionRegistrationTestCase(cases.BaseServerTestCase):
         IRCv3.2: “Servers MUST NOT send messages described by this document if
         the client only supports version 3.1.”
         -- <http://ircv3.net/specs/core/capability-negotiation-3.2.html#version-in-cap-ls>
-        """
+        """  # noqa
         self.addClient()
         self.sendLine(1, "CAP LS")
         m = self.getRegistrationMessage(1)
@@ -162,7 +162,7 @@ class ConnectionRegistrationTestCase(cases.BaseServerTestCase):
     def testEmptyCapList(self):
         """“If no capabilities are active, an empty parameter must be sent.”
         -- <http://ircv3.net/specs/core/capability-negotiation-3.1.html#the-cap-list-subcommand>
-        """
+        """  # noqa
         self.addClient()
         self.sendLine(1, "CAP LIST")
         m = self.getRegistrationMessage(1)
diff --git a/irctest/server_tests/test_labeled_responses.py b/irctest/server_tests/test_labeled_responses.py
index d40a9e5..899edf2 100644
--- a/irctest/server_tests/test_labeled_responses.py
+++ b/irctest/server_tests/test_labeled_responses.py
@@ -51,7 +51,11 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
             "label",
             m2.tags,
             m2,
-            fail_msg="When sending a PRIVMSG with a label, the target users shouldn't receive the label (only the sending user should): {msg}",
+            fail_msg=(
+                "When sending a PRIVMSG with a label, "
+                "the target users shouldn't receive the label "
+                "(only the sending user should): {msg}"
+            ),
         )
         self.assertMessageEqual(
             m3,
@@ -62,7 +66,11 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
             "label",
             m3.tags,
             m3,
-            fail_msg="When sending a PRIVMSG with a label, the target users shouldn't receive the label (only the sending user should): {msg}",
+            fail_msg=(
+                "When sending a PRIVMSG with a label, "
+                "the target users shouldn't receive the label "
+                "(only the sending user should): {msg}"
+            ),
         )
         self.assertMessageEqual(
             m4,
@@ -73,7 +81,11 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
             "label",
             m4.tags,
             m4,
-            fail_msg="When sending a PRIVMSG with a label, the target users shouldn't receive the label (only the sending user should): {msg}",
+            fail_msg=(
+                "When sending a PRIVMSG with a label, "
+                "the target users shouldn't receive the label "
+                "(only the sending user should): {msg}"
+            ),
         )
 
         self.assertMessageEqual(
@@ -109,7 +121,11 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
             "label",
             m2.tags,
             m2,
-            fail_msg="When sending a PRIVMSG with a label, the target user shouldn't receive the label (only the sending user should): {msg}",
+            fail_msg=(
+                "When sending a PRIVMSG with a label, "
+                "the target user shouldn't receive the label "
+                "(only the sending user should): {msg}"
+            ),
         )
 
         self.assertMessageEqual(
@@ -121,13 +137,19 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
             "label",
             m.tags,
             m,
-            fail_msg="When sending a PRIVMSG with a label, the echo'd message didn't contain the label at all: {msg}",
+            fail_msg=(
+                "When sending a PRIVMSG with a label, "
+                "the echo'd message didn't contain the label at all: {msg}"
+            ),
         )
         self.assertEqual(
             m.tags["label"],
             "12345",
             m,
-            fail_msg="Echo'd PRIVMSG to a client did not contain the same label we sent it with(should be '12345'): {msg}",
+            fail_msg=(
+                "Echo'd PRIVMSG to a client did not contain the same label "
+                "we sent it with(should be '12345'): {msg}"
+            ),
         )
 
     @cases.SpecificationSelector.requiredBySpecification("IRCv3.2")
@@ -168,7 +190,11 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
             "label",
             mt.tags,
             mt,
-            fail_msg="When sending a PRIVMSG with a label, the target user shouldn't receive the label (only the sending user should): {msg}",
+            fail_msg=(
+                "When sending a PRIVMSG with a label, "
+                "the target user shouldn't receive the label "
+                "(only the sending user should): {msg}"
+            ),
         )
 
         # ensure sender correctly receives msg
@@ -179,13 +205,19 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
             "label",
             ms.tags,
             ms,
-            fail_msg="When sending a PRIVMSG with a label, the source user should receive the label but didn't: {msg}",
+            fail_msg=(
+                "When sending a PRIVMSG with a label, "
+                "the source user should receive the label but didn't: {msg}"
+            ),
         )
         self.assertEqual(
             ms.tags["label"],
             "12345",
             ms,
-            fail_msg="Echo'd label doesn't match the label we sent (should be '12345'): {msg}",
+            fail_msg=(
+                "Echo'd label doesn't match the label we sent "
+                "(should be '12345'): {msg}"
+            ),
         )
 
     @cases.SpecificationSelector.requiredBySpecification("IRCv3.2")
@@ -214,16 +246,21 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
                     m.tags["label"],
                     "12345",
                     m,
-                    fail_msg="Echo'd label doesn't match the label we sent (should be '12345'): {msg}",
+                    fail_msg=(
+                        "Echo'd label doesn't match the label we sent "
+                        "(should be '12345'): {msg}"
+                    ),
                 )
 
         self.assertEqual(
             number_of_labels,
             1,
             m1,
-            fail_msg="When sending a PRIVMSG to self with echo-message, we only expect one message to contain the label. Instead, {} messages had the label".format(
-                number_of_labels
-            ),
+            fail_msg=(
+                "When sending a PRIVMSG to self with echo-message, "
+                "we only expect one message to contain the label. "
+                "Instead, {} messages had the label"
+            ).format(number_of_labels),
         )
 
     @cases.SpecificationSelector.requiredBySpecification("IRCv3.2")
@@ -255,7 +292,11 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
             "label",
             m2.tags,
             m2,
-            fail_msg="When sending a NOTICE with a label, the target user shouldn't receive the label (only the sending user should): {msg}",
+            fail_msg=(
+                "When sending a NOTICE with a label, "
+                "the target user shouldn't receive the label "
+                "(only the sending user should): {msg}"
+            ),
         )
 
         self.assertMessageEqual(
@@ -267,13 +308,19 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
             "label",
             m.tags,
             m,
-            fail_msg="When sending a NOTICE with a label, the echo'd message didn't contain the label at all: {msg}",
+            fail_msg=(
+                "When sending a NOTICE with a label, "
+                "the echo'd message didn't contain the label at all: {msg}"
+            ),
         )
         self.assertEqual(
             m.tags["label"],
             "12345",
             m,
-            fail_msg="Echo'd NOTICE to a client did not contain the same label we sent it with(should be '12345'): {msg}",
+            fail_msg=(
+                "Echo'd NOTICE to a client did not contain the same label "
+                "we sent it with (should be '12345'): {msg}"
+            ),
         )
 
     @cases.SpecificationSelector.requiredBySpecification("IRCv3.2")
@@ -314,7 +361,11 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
             "label",
             mt.tags,
             mt,
-            fail_msg="When sending a NOTICE with a label, the target user shouldn't receive the label (only the sending user should): {msg}",
+            fail_msg=(
+                "When sending a NOTICE with a label, "
+                "the target user shouldn't receive the label "
+                "(only the sending user should): {msg}"
+            ),
         )
 
         # ensure sender correctly receives msg
@@ -325,13 +376,19 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
             "label",
             ms.tags,
             ms,
-            fail_msg="When sending a NOTICE with a label, the source user should receive the label but didn't: {msg}",
+            fail_msg=(
+                "When sending a NOTICE with a label, "
+                "the source user should receive the label but didn't: {msg}"
+            ),
         )
         self.assertEqual(
             ms.tags["label"],
             "12345",
             ms,
-            fail_msg="Echo'd label doesn't match the label we sent (should be '12345'): {msg}",
+            fail_msg=(
+                "Echo'd label doesn't match the label we sent "
+                "(should be '12345'): {msg}"
+            ),
         )
 
     @cases.SpecificationSelector.requiredBySpecification("IRCv3.2")
@@ -358,16 +415,21 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
                     m.tags["label"],
                     "12345",
                     m,
-                    fail_msg="Echo'd label doesn't match the label we sent (should be '12345'): {msg}",
+                    fail_msg=(
+                        "Echo'd label doesn't match the label we sent "
+                        "(should be '12345'): {msg}"
+                    ),
                 )
 
         self.assertEqual(
             number_of_labels,
             1,
             m1,
-            fail_msg="When sending a NOTICE to self with echo-message, we only expect one message to contain the label. Instead, {} messages had the label".format(
-                number_of_labels
-            ),
+            fail_msg=(
+                "When sending a NOTICE to self with echo-message, "
+                "we only expect one message to contain the label. "
+                "Instead, {} messages had the label"
+            ).format(number_of_labels),
         )
 
     @cases.SpecificationSelector.requiredBySpecification("IRCv3.2")
@@ -399,7 +461,11 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
             "label",
             m2.tags,
             m2,
-            fail_msg="When sending a TAGMSG with a label, the target user shouldn't receive the label (only the sending user should): {msg}",
+            fail_msg=(
+                "When sending a TAGMSG with a label, "
+                "the target user shouldn't receive the label "
+                "(only the sending user should): {msg}"
+            ),
         )
         self.assertIn(
             "+draft/reply",
@@ -435,13 +501,19 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
             "label",
             m.tags,
             m,
-            fail_msg="When sending a TAGMSG with a label, the echo'd message didn't contain the label at all: {msg}",
+            fail_msg=(
+                "When sending a TAGMSG with a label, "
+                "the echo'd message didn't contain the label at all: {msg}"
+            ),
         )
         self.assertEqual(
             m.tags["label"],
             "12345",
             m,
-            fail_msg="Echo'd TAGMSG to a client did not contain the same label we sent it with(should be '12345'): {msg}",
+            fail_msg=(
+                "Echo'd TAGMSG to a client did not contain the same label "
+                "we sent it with (should be '12345'): {msg}"
+            ),
         )
         self.assertIn(
             "+draft/reply",
@@ -504,7 +576,11 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
             "label",
             mt.tags,
             mt,
-            fail_msg="When sending a TAGMSG with a label, the target user shouldn't receive the label (only the sending user should): {msg}",
+            fail_msg=(
+                "When sending a TAGMSG with a label, "
+                "the target user shouldn't receive the label "
+                "(only the sending user should): {msg}"
+            ),
         )
 
         # ensure sender correctly receives msg
@@ -515,13 +591,19 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
             "label",
             ms.tags,
             ms,
-            fail_msg="When sending a TAGMSG with a label, the source user should receive the label but didn't: {msg}",
+            fail_msg=(
+                "When sending a TAGMSG with a label, "
+                "the source user should receive the label but didn't: {msg}"
+            ),
         )
         self.assertEqual(
             ms.tags["label"],
             "12345",
             ms,
-            fail_msg="Echo'd label doesn't match the label we sent (should be '12345'): {msg}",
+            fail_msg=(
+                "Echo'd label doesn't match the label we sent "
+                "(should be '12345'): {msg}"
+            ),
         )
 
     @cases.SpecificationSelector.requiredBySpecification("IRCv3.2")
@@ -548,16 +630,21 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
                     m.tags["label"],
                     "12345",
                     m,
-                    fail_msg="Echo'd label doesn't match the label we sent (should be '12345'): {msg}",
+                    fail_msg=(
+                        "Echo'd label doesn't match the label we sent "
+                        "(should be '12345'): {msg}"
+                    ),
                 )
 
         self.assertEqual(
             number_of_labels,
             1,
             m1,
-            fail_msg="When sending a TAGMSG to self with echo-message, we only expect one message to contain the label. Instead, {} messages had the label".format(
-                number_of_labels
-            ),
+            fail_msg=(
+                "When sending a TAGMSG to self with echo-message, "
+                "we only expect one message to contain the label. "
+                "Instead, {} messages had the label"
+            ).format(number_of_labels),
         )
 
     @cases.SpecificationSelector.requiredBySpecification("IRCv3.2")
@@ -609,7 +696,8 @@ class LabeledResponsesTestCase(cases.BaseServerTestCase, cases.OptionalityHelper
         self.getMessages(1)
 
         self.sendLine(1, "@label=98765 PING adhoctestline")
-        # no BATCH should be initiated for a one-line response, it should just be labeled
+        # no BATCH should be initiated for a one-line response,
+        # it should just be labeled
         ms = self.getMessages(1)
         self.assertEqual(len(ms), 1)
         m = ms[0]
diff --git a/irctest/server_tests/test_lusers.py b/irctest/server_tests/test_lusers.py
index 5fb5ad4..d4fbe24 100644
--- a/irctest/server_tests/test_lusers.py
+++ b/irctest/server_tests/test_lusers.py
@@ -55,7 +55,7 @@ class LusersTestCase(cases.BaseServerTestCase):
             result.GlobalVisible = int(match.group(1))
             result.GlobalInvisible = int(match.group(2))
             result.Servers = int(match.group(3))
-        except:
+        except Exception:
             raise ValueError("corrupt reply for 251 RPL_LUSERCLIENT", luserclient_param)
 
         if RPL_LUSEROP in by_numeric:
@@ -78,7 +78,7 @@ class LusersTestCase(cases.BaseServerTestCase):
             match = LUSERME_REGEX.match(luserme_param)
             localTotalFromUserme = int(match.group(1))
             serversFromUserme = int(match.group(2))
-        except:
+        except Exception:
             raise ValueError("corrupt reply for 255 RPL_LUSERME", luserme_param)
         self.assertEqual(result.LocalTotal, localTotalFromUserme)
         # serversFromUserme is "servers i'm currently connected to", generally undefined
diff --git a/irctest/server_tests/test_message_tags.py b/irctest/server_tests/test_message_tags.py
index 0dc0bea..d5d7276 100644
--- a/irctest/server_tests/test_message_tags.py
+++ b/irctest/server_tests/test_message_tags.py
@@ -72,7 +72,7 @@ class MessageTagsTestCase(cases.BaseServerTestCase, cases.OptionalityHelper):
         getAllMessages()
 
         # test TAGMSG and basic escaping
-        self.sendLine("bob", "@+buzz=fizz\:buzz;cat=dog;+steel=wootz TAGMSG #test")
+        self.sendLine("bob", r"@+buzz=fizz\:buzz;cat=dog;+steel=wootz TAGMSG #test")
         bob_msg = self.getMessage("bob")  # bob has echo-message
         alice_msg = self.getMessage("alice")
         # carol MUST NOT receive TAGMSG at all
diff --git a/irctest/server_tests/test_metadata.py b/irctest/server_tests/test_metadata.py
index 5a436b9..1b3a499 100644
--- a/irctest/server_tests/test_metadata.py
+++ b/irctest/server_tests/test_metadata.py
@@ -132,10 +132,7 @@ class MetadataTestCase(cases.BaseServerTestCase):
             command="761",  # RPL_KEYVALUE
             fail_msg="Did not reply with 761 (RPL_KEYVALUE) to a valid "
             "“METADATA * SET {} :{}”: {msg}",
-            extra_format=(
-                key,
-                displayable_value,
-            ),
+            extra_format=(key, displayable_value),
         )
         self.assertEqual(
             m.params[1],
diff --git a/irctest/server_tests/test_monitor.py b/irctest/server_tests/test_monitor.py
index 3dc057c..95a5e57 100644
--- a/irctest/server_tests/test_monitor.py
+++ b/irctest/server_tests/test_monitor.py
@@ -263,19 +263,27 @@ class MonitorTestCase(cases.BaseServerTestCase):
         self.getMessages(1)
         self.getMessages(2)
         self.sendLine(2, "MONITOR - qux")
-        l = self.getMessages(2)
+        messages = self.getMessages(2)
         self.assertEqual(
-            l, [], fail_msg="Got response to “MONITOR -”: {}", extra_format=(l,)
+            messages,
+            [],
+            fail_msg="Got response to “MONITOR -”: {}",
+            extra_format=(messages,),
         )
         self.connectClient("qux")
         self.getMessages(3)
-        l = self.getMessages(1)
+        messages = self.getMessages(1)
         self.assertNotEqual(
-            l, [], fail_msg="Received no message after MONITORed client " "connects."
+            messages,
+            [],
+            fail_msg="Received no message after MONITORed client " "connects.",
         )
-        l = self.getMessages(2)
+        messages = self.getMessages(2)
         self.assertEqual(
-            l, [], fail_msg="Got response to unmonitored client: {}", extra_format=(l,)
+            messages,
+            [],
+            fail_msg="Got response to unmonitored client: {}",
+            extra_format=(messages,),
         )
 
     @cases.SpecificationSelector.requiredBySpecification("IRCv3.2")
@@ -300,36 +308,17 @@ class MonitorTestCase(cases.BaseServerTestCase):
         self.sendLine(1, "MONITOR + qux")
         self.getMessages(1)
         self.sendLine(1, "MONITOR L")
-        checkMonitorSubjects(
-            self.getMessages(1),
-            "bar",
-            {
-                "qux",
-            },
-        )
+        checkMonitorSubjects(self.getMessages(1), "bar", {"qux"})
 
         self.sendLine(1, "MONITOR + bazbat")
         self.getMessages(1)
         self.sendLine(1, "MONITOR L")
-        checkMonitorSubjects(
-            self.getMessages(1),
-            "bar",
-            {
-                "qux",
-                "bazbat",
-            },
-        )
+        checkMonitorSubjects(self.getMessages(1), "bar", {"qux", "bazbat"})
 
         self.sendLine(1, "MONITOR - qux")
         self.getMessages(1)
         self.sendLine(1, "MONITOR L")
-        checkMonitorSubjects(
-            self.getMessages(1),
-            "bar",
-            {
-                "bazbat",
-            },
-        )
+        checkMonitorSubjects(self.getMessages(1), "bar", {"bazbat"})
 
     @cases.SpecificationSelector.requiredBySpecification("IRCv3.2")
     def testNickChange(self):
diff --git a/irctest/server_tests/test_relaymsg.py b/irctest/server_tests/test_relaymsg.py
index 1374e3d..3e1071d 100644
--- a/irctest/server_tests/test_relaymsg.py
+++ b/irctest/server_tests/test_relaymsg.py
@@ -9,9 +9,7 @@ RELAYMSG_TAG_NAME = "draft/relaymsg"
 class RelaymsgTestCase(cases.BaseServerTestCase):
     @staticmethod
     def config():
-        return {
-            "chathistory": True,
-        }
+        return {"chathistory": True}
 
     @cases.SpecificationSelector.requiredBySpecification("Oragono")
     def testRelaymsg(self):
diff --git a/irctest/server_tests/test_resume.py b/irctest/server_tests/test_resume.py
index 96017b0..4bf58a4 100644
--- a/irctest/server_tests/test_resume.py
+++ b/irctest/server_tests/test_resume.py
@@ -63,8 +63,8 @@ class ResumeTestCase(cases.BaseServerTestCase):
         )
         channelMsgTime = privmsgs[0].tags.get("time")
 
-        # tokens MUST be cryptographically secure; therefore, this token should be invalid
-        # with probability at least 1 - 1/(2**128)
+        # tokens MUST be cryptographically secure; therefore, this token should be
+        # invalid with probability at least 1 - 1/(2**128)
         bad_token = "a" * len(token)
         self.addClient()
         self.sendLine(3, "CAP LS")
@@ -127,8 +127,8 @@ class ResumeTestCase(cases.BaseServerTestCase):
             privmsgs[1], command="PRIVMSG", params=["baz", "hello friend singular"]
         )
         # should replay with the original server-time
-        # TODO this probably isn't testing anything because the timestamp only has second resolution,
-        # hence will typically match by accident
+        # TODO this probably isn't testing anything because the timestamp only
+        # has second resolution, hence will typically match by accident
         self.assertEqual(privmsgs[0].tags.get("time"), channelMsgTime)
 
         # legacy client should receive a QUIT and a JOIN
diff --git a/irctest/server_tests/test_roleplay.py b/irctest/server_tests/test_roleplay.py
index 297fa4a..e85b59f 100644
--- a/irctest/server_tests/test_roleplay.py
+++ b/irctest/server_tests/test_roleplay.py
@@ -6,9 +6,7 @@ from irctest.numerics import ERR_CANNOTSENDRP
 class RoleplayTestCase(cases.BaseServerTestCase):
     @staticmethod
     def config():
-        return {
-            "oragono_roleplay": True,
-        }
+        return {"oragono_roleplay": True}
 
     @cases.SpecificationSelector.requiredBySpecification("Oragono")
     def testRoleplay(self):
diff --git a/irctest/server_tests/test_statusmsg.py b/irctest/server_tests/test_statusmsg.py
index 849af4e..09ca934 100644
--- a/irctest/server_tests/test_statusmsg.py
+++ b/irctest/server_tests/test_statusmsg.py
@@ -11,7 +11,8 @@ class StatusmsgTestCase(cases.BaseServerTestCase):
 
     @cases.SpecificationSelector.requiredBySpecification("Oragono")
     def testStatusmsg(self):
-        """Test that STATUSMSG are sent to the intended recipients, with the intended prefixes."""
+        """Test that STATUSMSG are sent to the intended recipients,
+        with the intended prefixes."""
         self.connectClient("chanop")
         self.joinChannel(1, "#chan")
         self.getMessages(1)
diff --git a/irctest/server_tests/test_znc_playback.py b/irctest/server_tests/test_znc_playback.py
index aa430df..9e5fc82 100644
--- a/irctest/server_tests/test_znc_playback.py
+++ b/irctest/server_tests/test_znc_playback.py
@@ -20,9 +20,7 @@ def extract_playback_privmsgs(messages):
 class ZncPlaybackTestCase(cases.BaseServerTestCase):
     @staticmethod
     def config():
-        return {
-            "chathistory": True,
-        }
+        return {"chathistory": True}
 
     @cases.SpecificationSelector.requiredBySpecification("Oragono")
     def testZncPlayback(self):
@@ -112,7 +110,8 @@ class ZncPlaybackTestCase(cases.BaseServerTestCase):
             password=pw,
         )
         mid_timestamp = ircv3_timestamp_to_unixtime(echo_messages[5].time)
-        # exclude message 5 itself (oragono's CHATHISTORY implementation corrects for this, but znc.in/playback does not because whatever)
+        # exclude message 5 itself (oragono's CHATHISTORY implementation
+        # corrects for this, but znc.in/playback does not because whatever)
         mid_timestamp += 0.001
         self.sendLine("viewer", "PRIVMSG *playback :play * %s" % (mid_timestamp,))
         messages = extract_playback_privmsgs(self.getMessages("viewer"))
@@ -139,32 +138,16 @@ class ZncPlaybackTestCase(cases.BaseServerTestCase):
         self.sendLine(
             "viewer",
             "PRIVMSG *playback :play %s %s %s"
-            % (
-                chname,
-                start_timestamp,
-                end_timestamp,
-            ),
+            % (chname, start_timestamp, end_timestamp),
         )
         messages = extract_playback_privmsgs(self.getMessages("viewer"))
         self.assertEqual(messages, echo_messages[3:7])
         # test nicknames as targets
-        self.sendLine(
-            "viewer",
-            "PRIVMSG *playback :play %s %d"
-            % (
-                qux,
-                early_time,
-            ),
-        )
+        self.sendLine("viewer", "PRIVMSG *playback :play %s %d" % (qux, early_time))
         messages = extract_playback_privmsgs(self.getMessages("viewer"))
         self.assertEqual(messages, [dm])
         self.sendLine(
-            "viewer",
-            "PRIVMSG *playback :play %s %d"
-            % (
-                qux.upper(),
-                early_time,
-            ),
+            "viewer", "PRIVMSG *playback :play %s %d" % (qux.upper(), early_time)
         )
         messages = extract_playback_privmsgs(self.getMessages("viewer"))
         self.assertEqual(messages, [dm])