diff --git a/daphne/access.py b/daphne/access.py
index 8d5bf24..298ae59 100644
--- a/daphne/access.py
+++ b/daphne/access.py
@@ -71,4 +71,4 @@ class AccessLogGenerator(object):
 
     def close_stream(self):
         self.stream.flush()
-        self.stream.close()
\ No newline at end of file
+        self.stream.close()
diff --git a/daphne/cli.py b/daphne/cli.py
index 09748d6..0035df7 100755
--- a/daphne/cli.py
+++ b/daphne/cli.py
@@ -1,9 +1,8 @@
 import argparse
 import functools
 import logging
-import sys
 import signal
-
+import sys
 from argparse import ArgumentError, Namespace
 
 from asgiref.compatibility import is_double_callable
@@ -188,14 +187,12 @@ class CommandLineInterface(object):
 
         self.server = None
 
-
     # For logrotate at SIGNALUSR1
     def logrotate(self, signum, stack):
         if self.access_log is not None:
             access_log_stream = open(self.access_log, "a", 1)
             self.server.rotate_log_action(AccessLogGenerator(access_log_stream))
 
-
     @classmethod
     def entrypoint(cls):
         """
diff --git a/daphne/server.py b/daphne/server.py
index 4fb756d..a05fd82 100755
--- a/daphne/server.py
+++ b/daphne/server.py
@@ -329,4 +329,4 @@ class Server(object):
 
     def rotate_log_action(self, log):
         self.action_logger.close_stream()
-        self.action_logger = log
\ No newline at end of file
+        self.action_logger = log