diff --git a/bots/irc-mirror.py b/bots/irc-mirror.py
index f9af690..5185b91 100755
--- a/bots/irc-mirror.py
+++ b/bots/irc-mirror.py
@@ -35,6 +35,7 @@ class IRCBot(irc.bot.SingleServerIRCBot):
     def on_welcome(self, c, e):
         # type: (ServerConnection, Event) -> None
         c.join(self.channel)
+
         def forward_to_irc(msg):
             # type: (Dict[str, Any]) -> None
             if msg["type"] == "stream":
diff --git a/bots/zephyr_mirror.py b/bots/zephyr_mirror.py
index 38275b5..c1e52b8 100755
--- a/bots/zephyr_mirror.py
+++ b/bots/zephyr_mirror.py
@@ -62,6 +62,7 @@ if options.forward_class_messages and not options.noshard:
     from zerver.lib.parallel import run_parallel
     print("Starting parallel zephyr class mirroring bot")
     jobs = list("0123456789abcdef")
+
     def run_job(shard):
         # type: (str) -> int
         subprocess.call(args + ["--shard=%s" % (shard,)])
diff --git a/integrations/perforce/git_p4.py b/integrations/perforce/git_p4.py
index 69b1646..8730aaf 100755
--- a/integrations/perforce/git_p4.py
+++ b/integrations/perforce/git_p4.py
@@ -39,9 +39,11 @@ except ImportError:
         """This exception is raised when a process run by check_call() returns
         a non-zero exit status.  The exit status will be stored in the
         returncode attribute."""
+
         def __init__(self, returncode, cmd):
             self.returncode = returncode
             self.cmd = cmd
+
         def __str__(self):
             return "Command '%s' returned non-zero exit status %d" % (self.cmd, self.returncode)
 
diff --git a/zulip/__init__.py b/zulip/__init__.py
index ff726b8..bcbcccb 100644
--- a/zulip/__init__.py
+++ b/zulip/__init__.py
@@ -398,6 +398,7 @@ class Client(object):
                 if request is None:
                     request = {}
                 return request
+
         def call(self, *args, **kwargs):
             request = make_request(*args, **kwargs)
             if computed_url is not None:
@@ -411,6 +412,7 @@ class Client(object):
     def call_on_each_event(self, callback, event_types=None, narrow=None):
         if narrow is None:
             narrow = []
+
         def do_register():
             while True:
                 if event_types is None: