diff --git a/thriftpy2/_compat.py b/thriftpy2/_compat.py
index 34b4b6f..84d77c9 100644
--- a/thriftpy2/_compat.py
+++ b/thriftpy2/_compat.py
@@ -11,8 +11,8 @@
 
 import platform
 import sys
-from urllib.request import urlopen
 from urllib.parse import urlparse
+from urllib.request import urlopen
 
 PY3 = sys.version_info[0] == 3
 PY35 = sys.version_info >= (3, 5)
diff --git a/thriftpy2/contrib/aio/rpc.py b/thriftpy2/contrib/aio/rpc.py
index 097db33..6ee8445 100644
--- a/thriftpy2/contrib/aio/rpc.py
+++ b/thriftpy2/contrib/aio/rpc.py
@@ -1,13 +1,13 @@
 # -*- coding: utf-8 -*-
-import warnings
 import urllib
+import warnings
 
-from .processor import TAsyncProcessor
 from .client import TAsyncClient
+from .processor import TAsyncProcessor
 from .protocol.binary import TAsyncBinaryProtocolFactory
-from .transport.buffered import TAsyncBufferedTransportFactory
-from .socket import TAsyncSocket, TAsyncServerSocket
 from .server import TAsyncServer
+from .socket import TAsyncServerSocket, TAsyncSocket
+from .transport.buffered import TAsyncBufferedTransportFactory
 
 
 async def make_client(service, host='localhost', port=9090, unix_socket=None,
diff --git a/thriftpy2/http.py b/thriftpy2/http.py
index e38c831..ae18c3a 100644
--- a/thriftpy2/http.py
+++ b/thriftpy2/http.py
@@ -32,23 +32,20 @@
 
 from __future__ import absolute_import
 
+import http.client as http_client
+import http.server as http_server
 import os
 import socket
 import sys
+import urllib
 from contextlib import contextmanager
 from io import BytesIO
 
-import http.client as http_client
-import http.server as http_server
-import urllib
-
-from thriftpy2.thrift import TProcessor, TClient
-from thriftpy2.server import TServer
-from thriftpy2.transport import TTransportBase, TMemoryBuffer
-
 from thriftpy2.protocol import TBinaryProtocolFactory
-from thriftpy2.transport import TBufferedTransportFactory
-
+from thriftpy2.server import TServer
+from thriftpy2.thrift import TClient, TProcessor
+from thriftpy2.transport import (TBufferedTransportFactory, TMemoryBuffer,
+                                 TTransportBase)
 
 HTTP_URI = '{scheme}://{host}:{port}{path}'
 DEFAULT_HTTP_CLIENT_TIMEOUT_MS = 30000  # 30 seconds
diff --git a/thriftpy2/rpc.py b/thriftpy2/rpc.py
index 4c2ccd2..c9e7664 100644
--- a/thriftpy2/rpc.py
+++ b/thriftpy2/rpc.py
@@ -4,21 +4,15 @@
 
 import contextlib
 import socket
+import urllib
 import warnings
 
 from thriftpy2._compat import PY35
-import urllib
-
 from thriftpy2.protocol import TBinaryProtocolFactory
 from thriftpy2.server import TThreadedServer
-from thriftpy2.thrift import TProcessor, TClient
-from thriftpy2.transport import (
-    TBufferedTransportFactory,
-    TServerSocket,
-    TSSLServerSocket,
-    TSocket,
-    TSSLSocket,
-)
+from thriftpy2.thrift import TClient, TProcessor
+from thriftpy2.transport import (TBufferedTransportFactory, TServerSocket,
+                                 TSocket, TSSLServerSocket, TSSLSocket)
 
 
 def make_client(service, host="localhost", port=9090, unix_socket=None,
@@ -131,7 +125,6 @@ def client_context(service, host="localhost", port=9090, unix_socket=None,
 
 
 if PY35:
-    from thriftpy2.contrib.aio.rpc import (  # noqa
-        make_server as make_aio_server,
-        make_client as make_aio_client
-    )
+    from thriftpy2.contrib.aio.rpc import make_client as make_aio_client
+    from thriftpy2.contrib.aio.rpc import \
+        make_server as make_aio_server  # noqa
diff --git a/thriftpy2/tornado.py b/thriftpy2/tornado.py
index d776bb4..95e3804 100644
--- a/thriftpy2/tornado.py
+++ b/thriftpy2/tornado.py
@@ -17,23 +17,22 @@
 
 from __future__ import absolute_import
 
+import logging
+import socket
+import struct
+import urllib
 from contextlib import contextmanager
-from tornado import tcpserver, iostream, gen
-from tornado import version as tornado_version
-from io import BytesIO
 from datetime import timedelta
+from io import BytesIO
 
-from .transport import TTransportException, TTransportBase
-from .transport.memory import TMemoryBuffer
-from .thrift import TApplicationException, TProcessor, TClient
+from tornado import gen, iostream, tcpserver
+from tornado import version as tornado_version
 
 # TODO need TCyTornadoStreamTransport to work with cython binary protocol
 from .protocol.binary import TBinaryProtocolFactory
-
-import urllib
-import logging
-import socket
-import struct
+from .thrift import TApplicationException, TClient, TProcessor
+from .transport import TTransportBase, TTransportException
+from .transport.memory import TMemoryBuffer
 
 try:
     from tornado.locks import Lock