diff --git a/tools/documentation_crawler/documentation_crawler/settings.py b/tools/documentation_crawler/documentation_crawler/settings.py
index c396a6d1ef..717a555715 100644
--- a/tools/documentation_crawler/documentation_crawler/settings.py
+++ b/tools/documentation_crawler/documentation_crawler/settings.py
@@ -18,7 +18,9 @@ LOG_LEVEL = 'ERROR'
 
 
 # Crawl responsibly by identifying yourself (and your website) on the user-agent
-USER_AGENT = 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.59 Safari/537.36'
+USER_AGENT = ('Mozilla/5.0 (X11; Linux x86_64) '
+              'AppleWebKit/537.36 (KHTML, like Gecko) '
+              'Chrome/54.0.2840.59 Safari/537.36')
 
 # Obey robots.txt rules
 ROBOTSTXT_OBEY = False
diff --git a/tools/droplets/create.py b/tools/droplets/create.py
index 9cc1d040fa..10824ce5e7 100644
--- a/tools/droplets/create.py
+++ b/tools/droplets/create.py
@@ -194,7 +194,8 @@ Your remote Zulip dev server has been created!
 - There is no password; your account is configured to use your ssh keys.
 - Once you log in, you should see `(zulip-venv) ~$`.
 - To start the dev server, `cd zulip` and then run `./tools/run-dev.py`.
-- While the dev server is running, you can see the Zulip server in your browser at http://{0}.zulipdev.org:9991.
+- While the dev server is running, you can see the Zulip server in your browser at
+  http://{0}.zulipdev.org:9991.
 """.format(username))
 
     print("See [Developing remotely](http://zulip.readthedocs.io/en/latest/dev-remote.html) "
diff --git a/tools/lister.py b/tools/lister.py
index 003cc94709..95d3a49453 100755
--- a/tools/lister.py
+++ b/tools/lister.py
@@ -114,9 +114,11 @@ if __name__ == "__main__":
     parser.add_argument('targets', nargs='*', default=[],
                         help='''files and directories to include in the result.
                         If this is not specified, the current directory is used''')
-    parser.add_argument('-m', '--modified', action='store_true', default=False, help='list only modified files')
+    parser.add_argument('-m', '--modified', action='store_true', default=False,
+                        help='list only modified files')
     parser.add_argument('-f', '--ftypes', nargs='+', default=[],
-                        help="list of file types to filter on. All files are included if this option is absent")
+                        help="list of file types to filter on. "
+                             "All files are included if this option is absent")
     parser.add_argument('--ext-only', dest='extonly', action='store_true', default=False,
                         help='only use extension to determine file type')
     parser.add_argument('--exclude', nargs='+', default=[],
diff --git a/tools/replace-tarball-shebang b/tools/replace-tarball-shebang
index bb450dfb78..587be65fce 100755
--- a/tools/replace-tarball-shebang
+++ b/tools/replace-tarball-shebang
@@ -17,7 +17,8 @@ old_shebang_bytes = old_shebang.encode()
 new_shebang_bytes = new_shebang.encode()
 
 with tarfile.open(fileobj=stdin, mode='r|*') as in_tar, \
-        tarfile.open(fileobj=stdout, mode='w', format=tarfile.PAX_FORMAT, pax_headers=in_tar.pax_headers) as out_tar:
+        tarfile.open(fileobj=stdout, mode='w',
+                     format=tarfile.PAX_FORMAT, pax_headers=in_tar.pax_headers) as out_tar:
     for info in in_tar:
         if info.isfile():
             file = in_tar.extractfile(info)
diff --git a/tools/setup/emoji/build_emoji b/tools/setup/emoji/build_emoji
index 49ebe0894b..6bf3b5b91b 100755
--- a/tools/setup/emoji/build_emoji
+++ b/tools/setup/emoji/build_emoji
@@ -236,7 +236,8 @@ def dump_emojis(cache_path):
         emoji_data = ujson.load(emoji_data_file)
     emoji_catalog = generate_emoji_catalog(emoji_data)
 
-    UNIFIED_REACTIONS_PATH = os.path.join(ZULIP_PATH, 'zerver', 'management', 'data', 'unified_reactions.json')
+    UNIFIED_REACTIONS_PATH = os.path.join(ZULIP_PATH, 'zerver',
+                                          'management', 'data', 'unified_reactions.json')
     with open(UNIFIED_REACTIONS_PATH) as unified_reactions_file:
         unified_reactions_data = ujson.load(unified_reactions_file)