diff --git a/analytics/lib/fixtures.py b/analytics/lib/fixtures.py
index be7de5f5fa..41f8c8dfa3 100644
--- a/analytics/lib/fixtures.py
+++ b/analytics/lib/fixtures.py
@@ -46,8 +46,7 @@ def generate_time_series_data(days: int=100, business_hours_base: float=10,
     else:
         raise AssertionError(f"Unknown frequency: {frequency}")
     if length < 2:
-        raise AssertionError("Must be generating at least 2 data points. "
-                             f"Currently generating {length}")
+        raise AssertionError(f"Must be generating at least 2 data points. Currently generating {length}")
     growth_base = growth ** (1. / (length-1))
     values_no_noise = [seasonality[i % len(seasonality)] * (growth_base**i) for i in range(length)]
 
diff --git a/puppet/zulip/files/nagios_plugins/zulip_postgresql/check_postgresql_replication_lag b/puppet/zulip/files/nagios_plugins/zulip_postgresql/check_postgresql_replication_lag
index a4834800d7..abdc6b8e70 100755
--- a/puppet/zulip/files/nagios_plugins/zulip_postgresql/check_postgresql_replication_lag
+++ b/puppet/zulip/files/nagios_plugins/zulip_postgresql/check_postgresql_replication_lag
@@ -93,8 +93,7 @@ if replication_info:
 
 else:
     replication_info = run_sql_query(
-        'client_addr, state, sent_lsn, write_lsn, flush_lsn, replay_lsn'
-        ' from pg_stat_replication'
+        'client_addr, state, sent_lsn, write_lsn, flush_lsn, replay_lsn from pg_stat_replication'
     )
     if replication_info == 0:
         report('CRITICAL', 'No replicas!')
diff --git a/scripts/purge-old-deployments b/scripts/purge-old-deployments
index c664453feb..6eee8fe525 100755
--- a/scripts/purge-old-deployments
+++ b/scripts/purge-old-deployments
@@ -17,16 +17,15 @@ def parse_args() -> argparse.Namespace:
         "examined and removed.")
     parser.add_argument(
         "--threshold", dest="threshold_days", type=int, default=14,
-        metavar="<days>", help="Deployments older than "
-        "threshold days will be deleted. (defaults to 14)")
+        metavar="<days>",
+        help="Deployments older than threshold days will be deleted. (defaults to 14)")
     parser.add_argument(
         "--dry-run", action="store_true",
         help="If specified then script will only print the deployments and "
         "caches that it will delete/keep back. It will not delete anything.")
     parser.add_argument(
         "--verbose", action="store_true",
-        help="If specified then script will print a detailed report "
-        "of what is going on.")
+        help="If specified then script will print a detailed report of what is going on.")
 
     args = parser.parse_args()
     args.verbose |= args.dry_run    # Always print a detailed report in case of dry run.
diff --git a/tools/check-capitalization b/tools/check-capitalization
index 0c9370b703..82365b1fc6 100755
--- a/tools/check-capitalization
+++ b/tools/check-capitalization
@@ -22,8 +22,7 @@ if __name__ == '__main__':
     parser = argparse.ArgumentParser()
     parser.add_argument('--show-ignored',
                         action='store_true',
-                        help='Show strings that passed the check because they '
-                             'contained ignored phrases.')
+                        help='Show strings that passed the check because they contained ignored phrases.')
     parser.add_argument('--no-generate',
                         action='store_true',
                         help="Don't run makemessages command.")
diff --git a/tools/documentation_crawler/documentation_crawler/spiders/check_help_documentation.py b/tools/documentation_crawler/documentation_crawler/spiders/check_help_documentation.py
index 082001eaee..1b9f597619 100644
--- a/tools/documentation_crawler/documentation_crawler/spiders/check_help_documentation.py
+++ b/tools/documentation_crawler/documentation_crawler/spiders/check_help_documentation.py
@@ -30,8 +30,7 @@ class UnusedImagesLinterSpider(BaseDocumentationSpider):
     def closed(self, *args: Any, **kwargs: Any) -> None:
         unused_images = set(os.listdir(self.images_static_dir)) - self.static_images
         if unused_images:
-            exception_message = "The following images are not used in documentation " \
-                                "and can be removed: {}"
+            exception_message = "The following images are not used in documentation and can be removed: {}"
             self._set_error_state()
             unused_images_relatedpath = [
                 os.path.join(self.images_path, img) for img in unused_images]
diff --git a/tools/lib/provision.py b/tools/lib/provision.py
index dd6ee2f26e..f8a373aff0 100755
--- a/tools/lib/provision.py
+++ b/tools/lib/provision.py
@@ -79,8 +79,7 @@ if platform.architecture()[0] == '64bit':
 elif platform.architecture()[0] == '32bit':
     arch = "i386"
 else:
-    logging.critical("Only x86 is supported;"
-                     " ask on chat.zulip.org if you want another architecture.")
+    logging.critical("Only x86 is supported; ask on chat.zulip.org if you want another architecture.")
     # Note: It's probably actually not hard to add additional
     # architectures.
     sys.exit(1)
diff --git a/tools/lib/provision_inner.py b/tools/lib/provision_inner.py
index e2e6c5d353..540695a757 100755
--- a/tools/lib/provision_inner.py
+++ b/tools/lib/provision_inner.py
@@ -110,8 +110,7 @@ def setup_bash_profile() -> None:
 
         BASH_PROFILE = BASH_PROFILES[0]
         DOT_PROFILE = BASH_PROFILES[2]
-        OLD_PROFILE_TEXT = "source /srv/zulip-py3-venv/bin/activate\n" + \
-            "cd /srv/zulip\n"
+        OLD_PROFILE_TEXT = "source /srv/zulip-py3-venv/bin/activate\ncd /srv/zulip\n"
 
         if os.path.exists(DOT_PROFILE):
             try:
diff --git a/tools/lint b/tools/lint
index ecb82f5b36..03c1886346 100755
--- a/tools/lint
+++ b/tools/lint
@@ -50,25 +50,20 @@ def run() -> None:
 
     linter_config.external_linter('css', ['node', 'node_modules/.bin/stylelint'], ['css'],
                                   fix_arg='--fix',
-                                  description="Standard CSS style and formatting linter "
-                                  "(config: stylelint.config.js)")
+                                  description="Standard CSS style and formatting linter (config: stylelint.config.js)")
     linter_config.external_linter('eslint', ['node', 'node_modules/.bin/eslint',
                                              '--max-warnings=0', '--cache', '--ext', '.js,.ts'], ['js', 'ts'],
                                   fix_arg='--fix',
-                                  description="Standard JavaScript style and formatting linter "
-                                  "(config: .eslintrc).")
+                                  description="Standard JavaScript style and formatting linter (config: .eslintrc).")
     linter_config.external_linter('puppet', ['puppet', 'parser', 'validate'], ['pp'],
-                                  description="Runs the puppet parser validator, "
-                                  "checking for syntax errors.")
+                                  description="Runs the puppet parser validator, checking for syntax errors.")
     linter_config.external_linter('puppet-lint',
                                   ['puppet-lint', '--fail-on-warnings', *PUPPET_CHECK_RULES_TO_EXCLUDE],
                                   ['pp'],
                                   fix_arg='--fix',
-                                  description="Standard puppet linter "
-                                  "(config: tools/linter_lib/exclude.py)")
+                                  description="Standard puppet linter (config: tools/linter_lib/exclude.py)")
     linter_config.external_linter('templates', ['tools/check-templates'], ['hbs', 'html'],
-                                  description="Custom linter checks whitespace formatting "
-                                  "of HTML templates",
+                                  description="Custom linter checks whitespace formatting of HTML templates",
                                   fix_arg='--fix')
     linter_config.external_linter('openapi', ['node', 'tools/check-openapi'], ['yaml'],
                                   description="Validates our OpenAPI/Swagger API documentation "
@@ -89,8 +84,7 @@ def run() -> None:
                                   pass_targets=False,
                                   description="Shares duplicate packages in yarn.lock")
     linter_config.external_linter('gitlint', ['tools/commit-message-lint'],
-                                  description="Checks commit messages for common formatting errors "
-                                  "(config: .gitlint)")
+                                  description="Checks commit messages for common formatting errors (config: .gitlint)")
     linter_config.external_linter('isort', ['isort'], ['py'],
                                   description="Sorts Python import statements",
                                   check_arg=['--check-only', '--diff'])
@@ -112,8 +106,7 @@ def run() -> None:
                        "--dangerously-allow-arbitrary-code-execution-from-rules"]
     linter_config.external_linter('semgrep-py', [*semgrep_command, "--lang=python"], ['py'],
                                   fix_arg='--autofix',
-                                  description="Syntactic Grep (semgrep) Code Search Tool "
-                                  "(config: ./tools/semgrep.yml)")
+                                  description="Syntactic Grep (semgrep) Code Search Tool (config: ./tools/semgrep.yml)")
 
     linter_config.external_linter('thirdparty', ['tools/check-thirdparty'],
                                   description="Check docs/THIRDPARTY copyright file syntax")
diff --git a/tools/test-backend b/tools/test-backend
index a19463d22e..8e5353d32d 100755
--- a/tools/test-backend
+++ b/tools/test-backend
@@ -382,8 +382,7 @@ def main() -> None:
     TestRunner = get_runner(settings)
 
     if parallel > 1:
-        print("-- Running tests in parallel mode with {} "
-              "processes.".format(parallel), flush=True)
+        print(f"-- Running tests in parallel mode with {parallel} processes.", flush=True)
     else:
         print("-- Running tests in serial mode.", flush=True)
 
diff --git a/tools/tests/test_capitalization_checker.py b/tools/tests/test_capitalization_checker.py
index a03118132c..24a92bade8 100644
--- a/tools/tests/test_capitalization_checker.py
+++ b/tools/tests/test_capitalization_checker.py
@@ -7,11 +7,9 @@ from tools.lib.capitalization import check_capitalization, get_safe_text, is_cap
 
 class GetSafeTextTestCase(TestCase):
     def test_get_safe_text(self) -> None:
-        string = ('Messages in __page_params.product_name__ go to a '
-                  'stream and have a topic.')
+        string = ('Messages in __page_params.product_name__ go to a stream and have a topic.')
         safe_text = get_safe_text(string)
-        self.assertEqual(safe_text, 'Messages in __page_params_product_name__ '
-                                    'go to a stream and have a topic.')
+        self.assertEqual(safe_text, 'Messages in __page_params_product_name__ go to a stream and have a topic.')
 
         string = "Zulip Zulip. Zulip some text!"
         safe_text = get_safe_text(string)
diff --git a/zerver/forms.py b/zerver/forms.py
index 82771dc8d0..3f854cabb8 100644
--- a/zerver/forms.py
+++ b/zerver/forms.py
@@ -156,9 +156,7 @@ class HomepageForm(forms.Form):
         from_multiuse_invite = self.from_multiuse_invite
 
         if realm is None:
-            raise ValidationError(_("The organization you are trying to "
-                                    "join using {email} does not "
-                                    "exist.").format(email=email))
+            raise ValidationError(_("The organization you are trying to join using {email} does not exist.").format(email=email))
 
         if not from_multiuse_invite and realm.invite_required:
             raise ValidationError(_("Please request an invite for {email} "
diff --git a/zerver/lib/outgoing_webhook.py b/zerver/lib/outgoing_webhook.py
index 550123a79d..f6150eca72 100644
--- a/zerver/lib/outgoing_webhook.py
+++ b/zerver/lib/outgoing_webhook.py
@@ -236,8 +236,7 @@ def notify_bot_owner(event: Dict[str, Any],
     if status_code:
         notification_message += f"\nThe webhook got a response with status code *{status_code}*."
     if response_content:
-        notification_message += "\nThe response contains the following payload:\n" \
-                                f"```\n{response_content!r}\n```"
+        notification_message += f"\nThe response contains the following payload:\n```\n{response_content!r}\n```"
     if exception:
         notification_message += "\nWhen trying to send a request to the webhook service, an exception " \
                                 f"of type {type(exception).__name__} occurred:\n```\n{exception}\n```"
diff --git a/zerver/lib/webhooks/git.py b/zerver/lib/webhooks/git.py
index a4983cc6bb..bc1aa1fd56 100644
--- a/zerver/lib/webhooks/git.py
+++ b/zerver/lib/webhooks/git.py
@@ -26,13 +26,11 @@ PUSH_COMMITS_MESSAGE_TEMPLATE_WITHOUT_COMMITTERS = PUSH_COMMITS_BASE + """
 {commits_data}
 """
 PUSH_DELETE_BRANCH_MESSAGE_TEMPLATE = "{user_name} [deleted]({compare_url}) the branch {branch_name}."
-PUSH_LOCAL_BRANCH_WITHOUT_COMMITS_MESSAGE_TEMPLATE = ("{user_name} [pushed]({compare_url}) "
-                                                      "the branch {branch_name}.")
+PUSH_LOCAL_BRANCH_WITHOUT_COMMITS_MESSAGE_TEMPLATE = "{user_name} [pushed]({compare_url}) the branch {branch_name}."
 PUSH_COMMITS_MESSAGE_EXTENSION = "Commits by {}"
 PUSH_COMMITTERS_LIMIT_INFO = 3
 
-FORCE_PUSH_COMMITS_MESSAGE_TEMPLATE = ("{user_name} [force pushed]({url}) "
-                                       "to branch {branch_name}. Head is now {head}.")
+FORCE_PUSH_COMMITS_MESSAGE_TEMPLATE = "{user_name} [force pushed]({url}) to branch {branch_name}. Head is now {head}."
 CREATE_BRANCH_MESSAGE_TEMPLATE = "{user_name} created [{branch_name}]({url}) branch."
 CREATE_BRANCH_WITHOUT_URL_MESSAGE_TEMPLATE = "{user_name} created {branch_name} branch."
 REMOVE_BRANCH_MESSAGE_TEMPLATE = "{user_name} deleted branch {branch_name}."
diff --git a/zerver/management/commands/generate_realm_creation_link.py b/zerver/management/commands/generate_realm_creation_link.py
index d9fa493356..27faaab4bf 100644
--- a/zerver/management/commands/generate_realm_creation_link.py
+++ b/zerver/management/commands/generate_realm_creation_link.py
@@ -21,12 +21,10 @@ class Command(ZulipBaseCommand):
             # first check if the db has been initialized
             Realm.objects.first()
         except ProgrammingError:
-            raise CommandError("The Zulip database does not appear to exist. "
-                               "Have you run initialize-database?")
+            raise CommandError("The Zulip database does not appear to exist. Have you run initialize-database?")
 
         url = generate_realm_creation_url(by_admin=True)
-        self.stdout.write(self.style.SUCCESS("Please visit the following "
-                                             "secure single-use link to register your "))
+        self.stdout.write(self.style.SUCCESS("Please visit the following secure single-use link to register your "))
         self.stdout.write(self.style.SUCCESS("new Zulip organization:\033[0m"))
         self.stdout.write("")
         self.stdout.write(self.style.SUCCESS(f"    \033[1;92m{url}\033[0m"))
diff --git a/zerver/management/commands/import.py b/zerver/management/commands/import.py
index 0029e2e4d9..4652d7047b 100644
--- a/zerver/management/commands/import.py
+++ b/zerver/management/commands/import.py
@@ -76,8 +76,7 @@ import a database dump from one or more JSON files."""
             if not os.path.exists(path):
                 raise CommandError(f"Directory not found: '{path}'")
             if not os.path.isdir(path):
-                raise CommandError("Export file should be folder; if it's a "
-                                   "tarball, please unpack it first.")
+                raise CommandError("Export file should be folder; if it's a tarball, please unpack it first.")
             paths.append(path)
 
         for path in paths:
diff --git a/zerver/management/commands/realm_domain.py b/zerver/management/commands/realm_domain.py
index 54dc88584a..21ff07f564 100644
--- a/zerver/management/commands/realm_domain.py
+++ b/zerver/management/commands/realm_domain.py
@@ -47,8 +47,7 @@ class Command(ZulipBaseCommand):
                                            allow_subdomains=options["allow_subdomains"])
                 sys.exit(0)
             except IntegrityError:
-                raise CommandError(f"The domain {domain} is already a part "
-                                   "of your organization.")
+                raise CommandError(f"The domain {domain} is already a part of your organization.")
         elif options["op"] == "remove":
             try:
                 RealmDomain.objects.get(realm=realm, domain=domain).delete()
diff --git a/zerver/management/commands/send_webhook_fixture_message.py b/zerver/management/commands/send_webhook_fixture_message.py
index b6ea82d1e3..e7a7d6ef1e 100644
--- a/zerver/management/commands/send_webhook_fixture_message.py
+++ b/zerver/management/commands/send_webhook_fixture_message.py
@@ -36,12 +36,10 @@ approach shown above.
                                  'into Zulip')
 
         parser.add_argument('-u', '--url',
-                            help='The URL on your Zulip server that you want '
-                                 'to post the fixture to')
+                            help='The URL on your Zulip server that you want to post the fixture to')
 
         parser.add_argument('-H', '--custom-headers',
-                            help='The headers you want to provide along with '
-                                 'your mock request to Zulip.')
+                            help='The headers you want to provide along with your mock request to Zulip.')
 
         self.add_realm_args(parser, help="Specify which realm/subdomain to connect to; default is zulip")
 
diff --git a/zerver/management/commands/turn_off_digests.py b/zerver/management/commands/turn_off_digests.py
index 1f308a88f1..8e7e3b3c93 100644
--- a/zerver/management/commands/turn_off_digests.py
+++ b/zerver/management/commands/turn_off_digests.py
@@ -11,8 +11,7 @@ class Command(ZulipBaseCommand):
         self.add_realm_args(parser)
 
         self.add_user_list_args(parser,
-                                help='Turn off digests for this comma-separated '
-                                     'list of email addresses.',
+                                help='Turn off digests for this comma-separated list of email addresses.',
                                 all_users_help="Turn off digests for everyone in realm.")
 
     def handle(self, **options: str) -> None:
diff --git a/zerver/tests/test_decorators.py b/zerver/tests/test_decorators.py
index 2a77fbe261..2500f8fc0a 100644
--- a/zerver/tests/test_decorators.py
+++ b/zerver/tests/test_decorators.py
@@ -1486,8 +1486,7 @@ class TestAuthenticatedJsonPostViewDecorator(ZulipTestCase):
         with self.assertLogs(level="WARNING") as m, \
                 mock.patch('zerver.decorator.get_subdomain', return_value=''):
             self.assert_json_error_contains(self._do_test(user),
-                                            "Account is not associated with this "
-                                            "subdomain")
+                                            "Account is not associated with this subdomain")
         self.assertEqual(
             m.output,
             ["WARNING:root:User {} ({}) attempted to access API on wrong subdomain ({})".format(email, 'zulip', ''),
@@ -1497,8 +1496,7 @@ class TestAuthenticatedJsonPostViewDecorator(ZulipTestCase):
         with self.assertLogs(level="WARNING") as m, \
                 mock.patch('zerver.decorator.get_subdomain', return_value='acme'):
             self.assert_json_error_contains(self._do_test(user),
-                                            "Account is not associated with this "
-                                            "subdomain")
+                                            "Account is not associated with this subdomain")
         self.assertEqual(
             m.output,
             ["WARNING:root:User {} ({}) attempted to access API on wrong subdomain ({})".format(email, 'zulip', 'acme'),
@@ -1545,8 +1543,7 @@ class TestAuthenticatedJsonViewDecorator(ZulipTestCase):
         with self.assertLogs(level="WARNING") as m, \
                 mock.patch('zerver.decorator.get_subdomain', return_value=''):
             self.assert_json_error_contains(self._do_test(email),
-                                            "Account is not associated with this "
-                                            "subdomain")
+                                            "Account is not associated with this subdomain")
         self.assertEqual(
             m.output,
             ["WARNING:root:User {} ({}) attempted to access API on wrong subdomain ({})".format(email, "zulip", "")]
@@ -1555,8 +1552,7 @@ class TestAuthenticatedJsonViewDecorator(ZulipTestCase):
         with self.assertLogs(level="WARNING") as m, \
                 mock.patch('zerver.decorator.get_subdomain', return_value='acme'):
             self.assert_json_error_contains(self._do_test(email),
-                                            "Account is not associated with this "
-                                            "subdomain")
+                                            "Account is not associated with this subdomain")
         self.assertEqual(
             m.output,
             ["WARNING:root:User {} ({}) attempted to access API on wrong subdomain ({})".format(email, "zulip", "acme")]
diff --git a/zerver/tests/test_docs.py b/zerver/tests/test_docs.py
index 2a798d01a5..fead18c1c1 100644
--- a/zerver/tests/test_docs.py
+++ b/zerver/tests/test_docs.py
@@ -490,8 +490,7 @@ class PrivacyTermsTest(ZulipTestCase):
                                         response)
 
     def test_custom_terms_of_service_template(self) -> None:
-        not_configured_message = 'This installation of Zulip does not have a configured ' \
-                                 'terms of service'
+        not_configured_message = 'This installation of Zulip does not have a configured terms of service'
         with self.settings(TERMS_OF_SERVICE=None):
             response = self.client_get('/terms/')
         self.assert_in_success_response([not_configured_message], response)
@@ -501,8 +500,7 @@ class PrivacyTermsTest(ZulipTestCase):
         self.assert_not_in_success_response([not_configured_message], response)
 
     def test_custom_privacy_policy_template(self) -> None:
-        not_configured_message = 'This installation of Zulip does not have a configured ' \
-                                 'privacy policy'
+        not_configured_message = 'This installation of Zulip does not have a configured privacy policy'
         with self.settings(PRIVACY_POLICY=None):
             response = self.client_get('/privacy/')
         self.assert_in_success_response([not_configured_message], response)
diff --git a/zerver/tests/test_markdown.py b/zerver/tests/test_markdown.py
index f78c3ee27e..d5f181985a 100644
--- a/zerver/tests/test_markdown.py
+++ b/zerver/tests/test_markdown.py
@@ -1009,8 +1009,7 @@ class MarkdownTest(ZulipTestCase):
         realm_filter.save()
         self.assertEqual(
             realm_filter.__str__(),
-            '<RealmFilter(zulip): #(?P<id>[0-9]{2,8})'
-            ' https://trac.example.com/ticket/%(id)s>')
+            '<RealmFilter(zulip): #(?P<id>[0-9]{2,8}) https://trac.example.com/ticket/%(id)s>')
 
         msg = Message(sender=self.example_user('othello'))
         msg.set_topic_name("#444")
@@ -1679,8 +1678,7 @@ class MarkdownTest(ZulipTestCase):
         realm_filter.save()
         self.assertEqual(
             realm_filter.__str__(),
-            '<RealmFilter(zulip): #(?P<id>[0-9]{2,8})'
-            ' https://trac.example.com/ticket/%(id)s>')
+            '<RealmFilter(zulip): #(?P<id>[0-9]{2,8}) https://trac.example.com/ticket/%(id)s>')
         # Create a user that potentially interferes with the pattern.
         test_user = create_user(
             email='atomic@example.com',
@@ -1736,8 +1734,7 @@ class MarkdownTest(ZulipTestCase):
         realm_filter.save()
         self.assertEqual(
             realm_filter.__str__(),
-            '<RealmFilter(zulip): #(?P<id>[0-9]{2,8})'
-            ' https://trac.example.com/ticket/%(id)s>')
+            '<RealmFilter(zulip): #(?P<id>[0-9]{2,8}) https://trac.example.com/ticket/%(id)s>')
         # Create a user-group that potentially interferes with the pattern.
         user_id = user_profile.id
         user_group = self.create_user_group_for_test('support #123')
@@ -1908,8 +1905,7 @@ class MarkdownTest(ZulipTestCase):
         realm_filter.save()
         self.assertEqual(
             realm_filter.__str__(),
-            '<RealmFilter(zulip): #(?P<id>[0-9]{2,8})'
-            ' https://trac.example.com/ticket/%(id)s>')
+            '<RealmFilter(zulip): #(?P<id>[0-9]{2,8}) https://trac.example.com/ticket/%(id)s>')
         # Create a topic link that potentially interferes with the pattern.
         denmark = get_stream('Denmark', realm)
         msg = Message(sender=sender_user_profile, sending_client=get_client("test"))
@@ -1974,8 +1970,7 @@ class MarkdownTest(ZulipTestCase):
         realm_filter.save()
         self.assertEqual(
             realm_filter.__str__(),
-            '<RealmFilter(zulip): #(?P<id>[0-9]{2,8})'
-            ' https://trac.example.com/ticket/%(id)s>')
+            '<RealmFilter(zulip): #(?P<id>[0-9]{2,8}) https://trac.example.com/ticket/%(id)s>')
         # Create a stream that potentially interferes with the pattern.
         stream = Stream.objects.create(name='Stream #1234', realm=realm)
         msg = Message(sender=sender_user_profile, sending_client=get_client("test"))
diff --git a/zerver/tests/test_message_dict.py b/zerver/tests/test_message_dict.py
index e66d58ebf2..20232fa28e 100644
--- a/zerver/tests/test_message_dict.py
+++ b/zerver/tests/test_message_dict.py
@@ -256,8 +256,7 @@ class MessageDictTest(ZulipTestCase):
                                    url_format_string=url_format_string)
         self.assertEqual(
             realm_filter.__str__(),
-            '<RealmFilter(zulip): #(?P<id>[0-9]{2,8})'
-            ' https://trac.example.com/ticket/%(id)s>')
+            '<RealmFilter(zulip): #(?P<id>[0-9]{2,8}) https://trac.example.com/ticket/%(id)s>')
 
         def get_message(sender: UserProfile) -> Message:
             msg_id = self.send_stream_message(sender, 'Denmark', 'hello world', topic_name,
diff --git a/zerver/tests/test_message_edit.py b/zerver/tests/test_message_edit.py
index b4eb3ca9dd..edc1a68cd7 100644
--- a/zerver/tests/test_message_edit.py
+++ b/zerver/tests/test_message_edit.py
@@ -293,9 +293,7 @@ class EditMessageTest(ZulipTestCase):
             self.example_user("hamlet"),
             "Scotland",
             topic_name="editing",
-            content=('content before edit, line 1\n'
-                     '\n'
-                     'content before edit, line 3'))
+            content='content before edit, line 1\n\ncontent before edit, line 3')
         new_content_2 = ('content before edit, line 1\n'
                          'content after edit, line 2\n'
                          'content before edit, line 3')
@@ -310,8 +308,7 @@ class EditMessageTest(ZulipTestCase):
         message_history_2 = json_response_2['message_history']
 
         self.assertEqual(message_history_2[0]['rendered_content'],
-                         ('<p>content before edit, line 1</p>\n'
-                          '<p>content before edit, line 3</p>'))
+                         '<p>content before edit, line 1</p>\n<p>content before edit, line 3</p>')
         self.assertEqual(message_history_2[1]['rendered_content'],
                          ('<p>content before edit, line 1<br>\n'
                           'content after edit, line 2<br>\n'
@@ -321,8 +318,7 @@ class EditMessageTest(ZulipTestCase):
                           'content <span class="highlight_text_inserted">after edit, line 2<br> '
                           'content</span> before edit, line 3</p>'))
         self.assertEqual(message_history_2[1]['prev_rendered_content'],
-                         ('<p>content before edit, line 1</p>\n'
-                          '<p>content before edit, line 3</p>'))
+                         '<p>content before edit, line 1</p>\n<p>content before edit, line 3</p>')
 
     def test_edit_link(self) -> None:
         # Link editing
diff --git a/zerver/tests/test_message_fetch.py b/zerver/tests/test_message_fetch.py
index b301f32d8e..dd6017ca9d 100644
--- a/zerver/tests/test_message_fetch.py
+++ b/zerver/tests/test_message_fetch.py
@@ -3248,9 +3248,9 @@ class MessageHasKeywordsTest(ZulipTestCase):
 
         # This message should claim attachments 1 only because attachment 2
         # is not being parsed as a link by Markdown.
-        body = ("Some files here ...[zulip.txt]({})" +
-                "{}.... Some more...." +
-                "{}").format(dummy_urls[0], dummy_urls[1], dummy_urls[1])
+        body = (f"Some files here ...[zulip.txt]({dummy_urls[0]})"
+                f"{dummy_urls[1]}.... Some more...."
+                f"{dummy_urls[1]}")
         self.send_stream_message(user_profile, "Denmark", body, "test")
         assert_attachment_claimed(dummy_path_ids[0], True)
         assert_attachment_claimed(dummy_path_ids[1], False)
diff --git a/zerver/tests/test_new_users.py b/zerver/tests/test_new_users.py
index d170ec1c79..071955ace0 100644
--- a/zerver/tests/test_new_users.py
+++ b/zerver/tests/test_new_users.py
@@ -123,12 +123,9 @@ class TestBrowserAndOsUserAgentStrings(ZulipTestCase):
                 'Chrome/54.0.2840.59 Safari/537.36', 'Chrome', 'Linux'),
             ('mozilla/5.0 (windows nt 6.1; win64; x64) applewebkit/537.36 (khtml, like gecko) ' +
                 'chrome/56.0.2924.87 safari/537.36', 'Chrome', 'Windows'),
-            ('mozilla/5.0 (windows nt 6.1; wow64; rv:51.0) ' +
-                'gecko/20100101 firefox/51.0', 'Firefox', 'Windows'),
-            ('mozilla/5.0 (windows nt 6.1; wow64; trident/7.0; rv:11.0) ' +
-                'like gecko', 'Internet Explorer', 'Windows'),
-            ('Mozilla/5.0 (Android; Mobile; rv:27.0) ' +
-                'Gecko/27.0 Firefox/27.0', 'Firefox', 'Android'),
+            ('mozilla/5.0 (windows nt 6.1; wow64; rv:51.0) gecko/20100101 firefox/51.0', 'Firefox', 'Windows'),
+            ('mozilla/5.0 (windows nt 6.1; wow64; trident/7.0; rv:11.0) like gecko', 'Internet Explorer', 'Windows'),
+            ('Mozilla/5.0 (Android; Mobile; rv:27.0) Gecko/27.0 Firefox/27.0', 'Firefox', 'Android'),
             ('Mozilla/5.0 (iPhone; CPU iPhone OS 10_3 like Mac OS X) '
              'AppleWebKit/602.1.50 (KHTML, like Gecko) '
              'CriOS/56.0.2924.75 Mobile/14E5239e Safari/602.1', 'Chrome', 'iOS'),
diff --git a/zerver/tests/test_openapi.py b/zerver/tests/test_openapi.py
index d4561ac971..7a3294c3e2 100644
--- a/zerver/tests/test_openapi.py
+++ b/zerver/tests/test_openapi.py
@@ -102,8 +102,7 @@ class OpenAPIToolsTest(ZulipTestCase):
 
     def test_validate_against_openapi_schema(self) -> None:
         with self.assertRaises(ValidationError,
-                               msg=("Additional properties are not" +
-                                    " allowed ('foo' was unexpected)")):
+                               msg="Additional properties are not allowed ('foo' was unexpected)"):
             bad_content: Dict[str, object] = {
                 'msg': '',
                 'result': 'success',
diff --git a/zerver/tests/test_push_notifications.py b/zerver/tests/test_push_notifications.py
index 8584391e6a..cbb33a902d 100644
--- a/zerver/tests/test_push_notifications.py
+++ b/zerver/tests/test_push_notifications.py
@@ -923,8 +923,7 @@ class HandlePushNotificationTest(PushNotificationTest):
                            return_value={'apns': True}), \
                 mock.patch('zerver.lib.push_notifications.get_message_payload_gcm',
                            return_value=({'gcm': True}, {})), \
-                mock.patch('zerver.lib.push_notifications'
-                           '.send_notifications_to_bouncer') as mock_send:
+                mock.patch('zerver.lib.push_notifications.send_notifications_to_bouncer') as mock_send:
             handle_push_notification(user_profile.id, missed_message)
             mock_send.assert_called_with(user_profile.id,
                                          {'apns': True},
@@ -957,10 +956,8 @@ class HandlePushNotificationTest(PushNotificationTest):
                         return_value={'apns': True}), \
                 mock.patch('zerver.lib.push_notifications.get_message_payload_gcm',
                            return_value=({'gcm': True}, {})), \
-                mock.patch('zerver.lib.push_notifications'
-                           '.send_apple_push_notification') as mock_send_apple, \
-                mock.patch('zerver.lib.push_notifications'
-                           '.send_android_push_notification') as mock_send_android, \
+                mock.patch('zerver.lib.push_notifications.send_apple_push_notification') as mock_send_apple, \
+                mock.patch('zerver.lib.push_notifications.send_android_push_notification') as mock_send_android, \
                 mock.patch('zerver.lib.push_notifications.push_notifications_enabled', return_value = True) as mock_push_notifications:
 
             handle_push_notification(self.user_profile.id, missed_message)
@@ -980,8 +977,7 @@ class HandlePushNotificationTest(PushNotificationTest):
         )
 
         with self.settings(PUSH_NOTIFICATION_BOUNCER_URL=True), \
-                mock.patch('zerver.lib.push_notifications'
-                           '.send_notifications_to_bouncer') as mock_send:
+                mock.patch('zerver.lib.push_notifications.send_notifications_to_bouncer') as mock_send:
             handle_remove_push_notification(user_profile.id, [message.id])
             mock_send.assert_called_with(
                 user_profile.id,
@@ -1030,10 +1026,8 @@ class HandlePushNotificationTest(PushNotificationTest):
             PushDeviceToken.objects.filter(user=self.user_profile,
                                            kind=PushDeviceToken.APNS))
 
-        with mock.patch('zerver.lib.push_notifications'
-                        '.send_android_push_notification') as mock_send_android, \
-                mock.patch('zerver.lib.push_notifications'
-                           '.send_apple_push_notification') as mock_send_apple:
+        with mock.patch('zerver.lib.push_notifications.send_android_push_notification') as mock_send_android, \
+                mock.patch('zerver.lib.push_notifications.send_apple_push_notification') as mock_send_apple:
             handle_remove_push_notification(self.user_profile.id, [message.id])
             mock_send_android.assert_called_with(
                 android_devices,
@@ -1116,10 +1110,8 @@ class HandlePushNotificationTest(PushNotificationTest):
                         return_value={'apns': True}), \
                 mock.patch('zerver.lib.push_notifications.get_message_payload_gcm',
                            return_value=({'gcm': True}, {})), \
-                mock.patch('zerver.lib.push_notifications'
-                           '.send_apple_push_notification') as mock_send_apple, \
-                mock.patch('zerver.lib.push_notifications'
-                           '.send_android_push_notification') as mock_send_android, \
+                mock.patch('zerver.lib.push_notifications.send_apple_push_notification') as mock_send_apple, \
+                mock.patch('zerver.lib.push_notifications.send_android_push_notification') as mock_send_android, \
                 mock.patch('zerver.lib.push_notifications.logger.error') as mock_logger, \
                 mock.patch('zerver.lib.push_notifications.push_notifications_enabled', return_value = True) as mock_push_notifications:
             handle_push_notification(self.user_profile.id, missed_message)
@@ -1914,9 +1906,7 @@ class GCMSendTest(PushNotificationTest):
 
         data = self.get_gcm_data()
         send_android_push_notification_to_user(self.user_profile, data, {})
-        msg = ("GCM: Got canonical ref %s "
-               "replacing %s but new ID not "
-               "registered! Updating.")
+        msg = "GCM: Got canonical ref %s replacing %s but new ID not registered! Updating."
         mock_warning.assert_called_once_with(msg, t2, t1)
 
         self.assertEqual(get_count('1111'), 0)
diff --git a/zerver/tests/test_reactions.py b/zerver/tests/test_reactions.py
index 7b13a44ea7..12a3aea697 100644
--- a/zerver/tests/test_reactions.py
+++ b/zerver/tests/test_reactions.py
@@ -646,9 +646,7 @@ class DefaultEmojiReactionTests(EmojiReactionBase):
 
     def test_delete_insufficient_arguments_reaction(self) -> None:
         result = self.delete_reaction({})
-        self.assert_json_error(result, 'At least one of the following '
-                               'arguments must be present: emoji_name, '
-                               'emoji_code')
+        self.assert_json_error(result, 'At least one of the following arguments must be present: emoji_name, emoji_code')
 
     def test_delete_non_existing_emoji_reaction(self) -> None:
         reaction_info = {
diff --git a/zerver/tests/test_service_bot_system.py b/zerver/tests/test_service_bot_system.py
index 965cdefb03..23d2457893 100644
--- a/zerver/tests/test_service_bot_system.py
+++ b/zerver/tests/test_service_bot_system.py
@@ -217,8 +217,7 @@ class TestServiceBotStateHandler(ZulipTestCase):
         key = 'capacity-filling entry'
         storage.put(key, 'x' * (settings.USER_STATE_SIZE_LIMIT - len(key)))
 
-        with self.assertRaisesMessage(StateError, "Request exceeds storage limit by 32 characters. "
-                                                  "The limit is 100 characters."):
+        with self.assertRaisesMessage(StateError, "Request exceeds storage limit by 32 characters. The limit is 100 characters."):
             storage.put('too much data', 'a few bits too long')
 
         second_storage = StateHandler(self.second_bot_profile)
diff --git a/zerver/tests/test_signup.py b/zerver/tests/test_signup.py
index cc7df831c7..659849a969 100644
--- a/zerver/tests/test_signup.py
+++ b/zerver/tests/test_signup.py
@@ -1603,8 +1603,7 @@ so we didn't send them an invitation. We did send invitations to everyone else!"
         email_change_key = email_change_url.split('/')[-1]
         url = '/accounts/do_confirm/' + email_change_key
         result = self.client_get(url)
-        self.assert_in_success_response(["Whoops. We couldn't find your "
-                                         "confirmation link in the system."], result)
+        self.assert_in_success_response(["Whoops. We couldn't find your confirmation link in the system."], result)
 
     def test_confirmation_expired(self) -> None:
         email = self.nonreg_email("alice")
@@ -1621,8 +1620,7 @@ so we didn't send them an invitation. We did send invitations to everyone else!"
 
         target_url = '/' + url.split('/', 3)[3]
         result = self.client_get(target_url)
-        self.assert_in_success_response(["Whoops. The confirmation link has expired "
-                                         "or been deactivated."], result)
+        self.assert_in_success_response(["Whoops. The confirmation link has expired or been deactivated."], result)
 
     def test_send_more_than_one_invite_to_same_user(self) -> None:
         self.user_profile = self.example_user('iago')
@@ -3281,8 +3279,7 @@ class UserSignUpTest(InviteUserBase):
     def test_failed_signup_due_to_nonexistent_realm(self) -> None:
         email = 'user@acme.com'
         form = HomepageForm({'email': email}, realm=None)
-        self.assertIn("organization you are trying to join using {} does "
-                      "not exist".format(email), form.errors['email'][0])
+        self.assertIn(f"organization you are trying to join using {email} does not exist", form.errors['email'][0])
 
     def test_access_signup_page_in_root_domain_without_realm(self) -> None:
         result = self.client_get('/register', subdomain="", follow=True)
diff --git a/zerver/views/realm_domains.py b/zerver/views/realm_domains.py
index a99ed4addd..8a588fec1b 100644
--- a/zerver/views/realm_domains.py
+++ b/zerver/views/realm_domains.py
@@ -26,8 +26,7 @@ def create_realm_domain(request: HttpRequest, user_profile: UserProfile,
     except ValidationError as e:
         return json_error(_('Invalid domain: {}').format(e.messages[0]))
     if RealmDomain.objects.filter(realm=user_profile.realm, domain=domain).exists():
-        return json_error(_("The domain {domain} is already"
-                            " a part of your organization.").format(domain=domain))
+        return json_error(_("The domain {domain} is already a part of your organization.").format(domain=domain))
     realm_domain = do_add_realm_domain(user_profile.realm, domain, allow_subdomains)
     return json_success({'new_domain': [realm_domain.id, realm_domain.domain]})
 
diff --git a/zerver/webhooks/basecamp/view.py b/zerver/webhooks/basecamp/view.py
index a08291d1f8..b24de5b882 100644
--- a/zerver/webhooks/basecamp/view.py
+++ b/zerver/webhooks/basecamp/view.py
@@ -17,8 +17,7 @@ DOCUMENT_TEMPLATE = "{user_name} {verb} the document [{title}]({url})"
 QUESTION_TEMPLATE = "{user_name} {verb} the question [{title}]({url})"
 QUESTIONS_ANSWER_TEMPLATE = ("{user_name} {verb} the [answer]({answer_url}) " +
                              "of the question [{question_title}]({question_url})")
-COMMENT_TEMPLATE = ("{user_name} {verb} the [comment]({answer_url}) "
-                    "of the task [{task_title}]({task_url})")
+COMMENT_TEMPLATE = "{user_name} {verb} the [comment]({answer_url}) of the task [{task_title}]({task_url})"
 MESSAGE_TEMPLATE = "{user_name} {verb} the message [{title}]({url})"
 TODO_LIST_TEMPLATE = "{user_name} {verb} the todo list [{title}]({url})"
 TODO_TEMPLATE = "{user_name} {verb} the todo task [{title}]({url})"
diff --git a/zerver/webhooks/bitbucket2/view.py b/zerver/webhooks/bitbucket2/view.py
index abb025f7ba..85b68bd658 100644
--- a/zerver/webhooks/bitbucket2/view.py
+++ b/zerver/webhooks/bitbucket2/view.py
@@ -31,10 +31,8 @@ from zerver.models import UserProfile
 BITBUCKET_TOPIC_TEMPLATE = '{repository_name}'
 
 BITBUCKET_FORK_BODY = "{actor} forked the repository into [{fork_name}]({fork_url})."
-BITBUCKET_COMMIT_STATUS_CHANGED_BODY = ('[System {key}]({system_url}) changed status of'
-                                        ' {commit_info} to {status}.')
-BITBUCKET_REPO_UPDATED_CHANGED = ('{actor} changed the {change} of the **{repo_name}**'
-                                  ' repo from **{old}** to **{new}**')
+BITBUCKET_COMMIT_STATUS_CHANGED_BODY = '[System {key}]({system_url}) changed status of {commit_info} to {status}.'
+BITBUCKET_REPO_UPDATED_CHANGED = '{actor} changed the {change} of the **{repo_name}** repo from **{old}** to **{new}**'
 BITBUCKET_REPO_UPDATED_ADDED = '{actor} changed the {change} of the **{repo_name}** repo to **{new}**'
 
 PULL_REQUEST_SUPPORTED_ACTIONS = [
diff --git a/zerver/webhooks/clubhouse/view.py b/zerver/webhooks/clubhouse/view.py
index 7be9398689..04a57624e2 100644
--- a/zerver/webhooks/clubhouse/view.py
+++ b/zerver/webhooks/clubhouse/view.py
@@ -23,23 +23,17 @@ NAME_CHANGED_TEMPLATE = ("The name of the {entity} {name_template} was changed f
 ARCHIVED_TEMPLATE = "The {entity} {name_template} was {action}."
 STORY_TASK_TEMPLATE = "Task **{task_description}** was {action} the story {name_template}."
 STORY_TASK_COMPLETED_TEMPLATE = "Task **{task_description}** ({name_template}) was completed. :tada:"
-STORY_ADDED_REMOVED_EPIC_TEMPLATE = ("The story {story_name_template} was {action} the"
-                                     " epic {epic_name_template}.")
-STORY_EPIC_CHANGED_TEMPLATE = ("The story {story_name_template} was moved from {old_epic_name_template}"
-                               " to {new_epic_name_template}.")
+STORY_ADDED_REMOVED_EPIC_TEMPLATE = "The story {story_name_template} was {action} the epic {epic_name_template}."
+STORY_EPIC_CHANGED_TEMPLATE = "The story {story_name_template} was moved from {old_epic_name_template} to {new_epic_name_template}."
 STORY_ESTIMATE_TEMPLATE = "The estimate for the story {story_name_template} was set to {estimate}."
 FILE_ATTACHMENT_TEMPLATE = "A {type} attachment `{file_name}` was added to the story {name_template}."
 STORY_LABEL_TEMPLATE = "The label **{label_name}** was added to the story {name_template}."
-STORY_UPDATE_PROJECT_TEMPLATE = ("The story {name_template} was moved from"
-                                 " the **{old}** project to **{new}**.")
-STORY_UPDATE_TYPE_TEMPLATE = ("The type of the story {name_template} was changed"
-                              " from **{old_type}** to **{new_type}**.")
+STORY_UPDATE_PROJECT_TEMPLATE = "The story {name_template} was moved from the **{old}** project to **{new}**."
+STORY_UPDATE_TYPE_TEMPLATE = "The type of the story {name_template} was changed from **{old_type}** to **{new_type}**."
 DELETE_TEMPLATE = "The {entity_type} **{name}** was deleted."
 STORY_UPDATE_OWNER_TEMPLATE = "New owner added to the story {name_template}."
-STORY_GITHUB_PR_TEMPLATE = ("New GitHub PR [#{name}]({url}) opened for story"
-                            " {name_template} ({old} -> {new}).")
-STORY_GITHUB_BRANCH_TEMPLATE = ("New GitHub branch [{name}]({url})"
-                                " associated with story {name_template} ({old} -> {new}).")
+STORY_GITHUB_PR_TEMPLATE = "New GitHub PR [#{name}]({url}) opened for story {name_template} ({old} -> {new})."
+STORY_GITHUB_BRANCH_TEMPLATE = "New GitHub branch [{name}]({url}) associated with story {name_template} ({old} -> {new})."
 
 
 def get_action_with_primary_id(payload: Dict[str, Any]) -> Dict[str, Any]:
diff --git a/zerver/webhooks/front/tests.py b/zerver/webhooks/front/tests.py
index 8b06dc62ba..a68a6e7331 100644
--- a/zerver/webhooks/front/tests.py
+++ b/zerver/webhooks/front/tests.py
@@ -180,8 +180,7 @@ class FrontHookTests(WebhookTestCase):
 
     def test_comment(self) -> None:
         expected_topic = 'cnv_keocka'
-        expected_message = "**Bender Rodriguez** left a comment:\n" \
-                           "```quote\nSure.\n```"
+        expected_message = "**Bender Rodriguez** left a comment:\n```quote\nSure.\n```"
 
         self.check_webhook(
             "comment",
diff --git a/zerver/webhooks/github/view.py b/zerver/webhooks/github/view.py
index 78aa0abda9..d95bdc63e5 100644
--- a/zerver/webhooks/github/view.py
+++ b/zerver/webhooks/github/view.py
@@ -414,8 +414,7 @@ def get_pull_request_review_requested_body(helper: Helper) -> str:
     pr_number = payload['pull_request']['number']
     pr_url = payload['pull_request']['html_url']
     message = "**{sender}** requested {reviewers} for a review on [PR #{pr_number}]({pr_url})."
-    message_with_title = ("**{sender}** requested {reviewers} for a review on "
-                          "[PR #{pr_number} {title}]({pr_url}).")
+    message_with_title = "**{sender}** requested {reviewers} for a review on [PR #{pr_number} {title}]({pr_url})."
     body = message_with_title if include_title else message
 
     all_reviewers = []
diff --git a/zerver/webhooks/gocd/view.py b/zerver/webhooks/gocd/view.py
index b15558d335..274c0e3dbf 100644
--- a/zerver/webhooks/gocd/view.py
+++ b/zerver/webhooks/gocd/view.py
@@ -11,12 +11,11 @@ from zerver.lib.response import json_success
 from zerver.lib.webhooks.common import check_send_webhook_message
 from zerver.models import UserProfile
 
-MESSAGE_TEMPLATE = (
-    'Author: {}\n'
-    'Build status: {} {}\n'
-    'Details: [build log]({})\n'
-    'Comment: {}'
-)
+MESSAGE_TEMPLATE = """\
+Author: {}
+Build status: {} {}
+Details: [build log]({})
+Comment: {}"""
 
 @webhook_view('Gocd')
 @has_request_variables
diff --git a/zerver/webhooks/librato/view.py b/zerver/webhooks/librato/view.py
index 4db372a407..1969156940 100644
--- a/zerver/webhooks/librato/view.py
+++ b/zerver/webhooks/librato/view.py
@@ -130,8 +130,7 @@ class LibratoWebhookHandler(LibratoWebhookParser):
                                            condition: Dict[str, Any]) -> str:
         summary_function, threshold, condition_type, duration = self.parse_condition(condition)
         metric_name, recorded_at = self.parse_violation(violation)
-        metric_condition_template = ("\n * Metric `{metric_name}`, {summary_function} "
-                                     "was {condition_type} {threshold}")
+        metric_condition_template = "\n * Metric `{metric_name}`, {summary_function} was {condition_type} {threshold}"
         content = metric_condition_template.format(
             metric_name=metric_name, summary_function=summary_function, condition_type=condition_type,
             threshold=threshold)
diff --git a/zerver/webhooks/thinkst/view.py b/zerver/webhooks/thinkst/view.py
index 1315c940b6..e205f84884 100644
--- a/zerver/webhooks/thinkst/view.py
+++ b/zerver/webhooks/thinkst/view.py
@@ -62,8 +62,7 @@ def body(message: Dict[str, Any]) -> str:
 
     title = canary_kind(message).title()
     name = canary_name(message)
-    body = (f"**:alert: {title} *{name}* has been triggered!**\n\n"
-            f"{message['Intro']}\n\n")
+    body = f"**:alert: {title} *{name}* has been triggered!**\n\n{message['Intro']}\n\n"
 
     if 'IncidentHash' in message:
         body += f"**Incident Id:** `{message['IncidentHash']}`\n"
diff --git a/zerver/webhooks/travis/view.py b/zerver/webhooks/travis/view.py
index c393e37368..47bae289ea 100644
--- a/zerver/webhooks/travis/view.py
+++ b/zerver/webhooks/travis/view.py
@@ -14,11 +14,10 @@ GOOD_STATUSES = ['Passed', 'Fixed']
 BAD_STATUSES = ['Failed', 'Broken', 'Still Failing', 'Errored', 'Canceled']
 PENDING_STATUSES = ['Pending']
 
-MESSAGE_TEMPLATE = (
-    'Author: {}\n'
-    'Build status: {} {}\n'
-    'Details: [changes]({}), [build log]({})'
-)
+MESSAGE_TEMPLATE = """\
+Author: {}
+Build status: {} {}
+Details: [changes]({}), [build log]({})"""
 
 @webhook_view('Travis')
 @has_request_variables
diff --git a/zerver/worker/queue_processors.py b/zerver/worker/queue_processors.py
index 1c16143219..6e608261c3 100644
--- a/zerver/worker/queue_processors.py
+++ b/zerver/worker/queue_processors.py
@@ -635,8 +635,7 @@ class MirrorWorker(QueueProcessingWorker):
             try:
                 rate_limit_mirror_by_realm(recipient_realm)
             except RateLimited:
-                logger.warning("MirrorWorker: Rejecting an email from: %s "
-                               "to realm: %s - rate limited.",
+                logger.warning("MirrorWorker: Rejecting an email from: %s to realm: %s - rate limited.",
                                msg['From'], recipient_realm.name)
                 return
 
diff --git a/zproject/backends.py b/zproject/backends.py
index 2d1d746c01..e83bc6b210 100644
--- a/zproject/backends.py
+++ b/zproject/backends.py
@@ -987,8 +987,7 @@ class ExternalAuthResult:
             data_dict = {}
 
         if login_token is not None:
-            assert (not data_dict) and (user_profile is None), ("Passing in data_dict or user_profile " +
-                                                                "with login_token is disallowed.")
+            assert (not data_dict) and (user_profile is None), "Passing in data_dict or user_profile with login_token is disallowed."
             self.instantiate_with_token(login_token, delete_stored_data)
         else:
             self.data_dict = data_dict.copy()