diff --git a/zerver/tornado/application.py b/zerver/tornado/application.py
index 95c44ee77a..2917976b53 100644
--- a/zerver/tornado/application.py
+++ b/zerver/tornado/application.py
@@ -1,14 +1,13 @@
 
 import atexit
 
-from django.conf import settings
-
-from zerver.tornado.handlers import AsyncDjangoHandler
-from zerver.tornado.socket import get_sockjs_router
-from zerver.lib.queue import get_queue_client
-
 import tornado.autoreload
 import tornado.web
+from django.conf import settings
+
+from zerver.lib.queue import get_queue_client
+from zerver.tornado.handlers import AsyncDjangoHandler
+from zerver.tornado.socket import get_sockjs_router
 
 def setup_tornado_rabbitmq() -> None:
     # When tornado is shut down, disconnect cleanly from rabbitmq
diff --git a/zerver/tornado/exceptions.py b/zerver/tornado/exceptions.py
index d69c3732f3..11a60c090f 100644
--- a/zerver/tornado/exceptions.py
+++ b/zerver/tornado/exceptions.py
@@ -2,7 +2,7 @@ from typing import Text
 
 from django.utils.translation import ugettext as _
 
-from zerver.lib.exceptions import JsonableError, ErrorCode
+from zerver.lib.exceptions import ErrorCode, JsonableError
 
 class BadEventQueueIdError(JsonableError):
     code = ErrorCode.BAD_EVENT_QUEUE_ID
diff --git a/zerver/tornado/handlers.py b/zerver/tornado/handlers.py
index cd2736f42e..ce1c684d94 100644
--- a/zerver/tornado/handlers.py
+++ b/zerver/tornado/handlers.py
@@ -1,29 +1,28 @@
 
-import sys
-import tornado.web
 import logging
+import sys
+import urllib
+from threading import Lock
+from typing import Any, Callable, Dict, List, Optional
+
+import tornado.web
 from django import http
 from django.conf import settings
-from django.core.handlers.wsgi import WSGIRequest, get_script_name
+from django.core import exceptions, signals, urlresolvers
+from django.core.exceptions import MiddlewareNotUsed
 from django.core.handlers import base
 from django.core.handlers.exception import convert_exception_to_response
+from django.core.handlers.wsgi import WSGIRequest, get_script_name
 from django.core.urlresolvers import set_script_prefix
-from django.core import signals
-from django.core import exceptions, urlresolvers
-from django.core.exceptions import MiddlewareNotUsed
 from django.http import HttpRequest, HttpResponse
 from django.utils.module_loading import import_string
-from threading import Lock
 from tornado.wsgi import WSGIContainer
-import urllib
 
 from zerver.decorator import RespondAsynchronously
 from zerver.lib.response import json_response
-from zerver.middleware import async_request_stop, async_request_restart
+from zerver.middleware import async_request_restart, async_request_stop
 from zerver.tornado.descriptors import get_descriptor_by_handler_id
 
-from typing import Any, Callable, Dict, List, Optional
-
 current_handler_id = 0
 handlers = {}  # type: Dict[int, 'AsyncDjangoHandler']
 
diff --git a/zerver/tornado/ioloop_logging.py b/zerver/tornado/ioloop_logging.py
index 63d30b73c2..52d01e8e7d 100644
--- a/zerver/tornado/ioloop_logging.py
+++ b/zerver/tornado/ioloop_logging.py
@@ -1,11 +1,11 @@
+import logging
+import select
+import time
 from typing import Any, List, Tuple
 
-import logging
-import time
-import select
 from django.conf import settings
-
 from tornado.ioloop import IOLoop, PollIOLoop
+
 # There isn't a good way to get at what the underlying poll implementation
 # will be without actually constructing an IOLoop, so we just assume it will
 # be epoll.
diff --git a/zerver/tornado/views.py b/zerver/tornado/views.py
index e36f59d6db..1e4255e550 100644
--- a/zerver/tornado/views.py
+++ b/zerver/tornado/views.py
@@ -1,23 +1,21 @@
 
-from django.utils.translation import ugettext as _
-from django.http import HttpRequest, HttpResponse
-
-from zerver.models import get_client, UserProfile, Client
-
-from zerver.decorator import asynchronous, \
-    internal_notify_view, RespondAsynchronously, \
-    has_request_variables, REQ, _RespondAsynchronously
-
-from zerver.lib.response import json_success, json_error
-from zerver.lib.validator import check_bool, check_list, check_string
-from zerver.tornado.event_queue import get_client_descriptor, \
-    process_notification, fetch_events
-from zerver.tornado.exceptions import BadEventQueueIdError
-from django.core.handlers.base import BaseHandler
-
-from typing import Union, Optional, Iterable, Sequence, List, Text
 import time
+from typing import Iterable, List, Optional, Sequence, Text, Union
+
 import ujson
+from django.core.handlers.base import BaseHandler
+from django.http import HttpRequest, HttpResponse
+from django.utils.translation import ugettext as _
+
+from zerver.decorator import REQ, RespondAsynchronously, \
+    _RespondAsynchronously, asynchronous, \
+    has_request_variables, internal_notify_view
+from zerver.lib.response import json_error, json_success
+from zerver.lib.validator import check_bool, check_list, check_string
+from zerver.models import Client, UserProfile, get_client
+from zerver.tornado.event_queue import fetch_events, \
+    get_client_descriptor, process_notification
+from zerver.tornado.exceptions import BadEventQueueIdError
 
 @internal_notify_view(True)
 def notify(request: HttpRequest) -> HttpResponse: