diff --git a/daphne/cli.py b/daphne/cli.py
index 31cfe2d..675878e 100755
--- a/daphne/cli.py
+++ b/daphne/cli.py
@@ -1,8 +1,7 @@
 import argparse
 import logging
 import sys
-
-from argparse import Namespace, ArgumentError
+from argparse import ArgumentError, Namespace
 from typing import Union
 
 from .access import AccessLogGenerator
@@ -16,6 +15,7 @@ DEFAULT_HOST = "127.0.0.1"
 DEFAULT_PORT = 8000
 str_or_none = Union[None, str]
 
+
 class CommandLineInterface(object):
     """
     Acts as the main CLI entry point for running the server.
diff --git a/tests/test_cli.py b/tests/test_cli.py
index f946a82..fa9881c 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -1,8 +1,8 @@
 # coding: utf8
 
 import logging
-from unittest import TestCase
 from argparse import ArgumentError
+from unittest import TestCase
 
 from daphne.cli import CommandLineInterface
 from daphne.endpoints import build_endpoint_description_strings as build