diff --git a/aiohttp/abc.py b/aiohttp/abc.py
index dc343259fd3..0d2854e66ae 100644
--- a/aiohttp/abc.py
+++ b/aiohttp/abc.py
@@ -3,6 +3,7 @@
 from abc import ABC, abstractmethod
 from collections.abc import Iterable, Sized
 
+
 PY_35 = sys.version_info >= (3, 5)
 
 
diff --git a/aiohttp/backport_cookies.py b/aiohttp/backport_cookies.py
index e523e04ba99..94b03c128de 100644
--- a/aiohttp/backport_cookies.py
+++ b/aiohttp/backport_cookies.py
@@ -40,6 +40,7 @@
 import string  # pragma: no cover
 from http.cookies import CookieError, Morsel  # pragma: no cover
 
+
 __all__ = ["CookieError", "BaseCookie", "SimpleCookie"]  # pragma: no cover
 
 _nulljoin = ''.join  # pragma: no cover
diff --git a/aiohttp/client.py b/aiohttp/client.py
index 34bfe281090..c721a86ec67 100644
--- a/aiohttp/client.py
+++ b/aiohttp/client.py
@@ -15,19 +15,20 @@
 from . import connector as connector_mod
 from . import client_exceptions, client_reqrep, hdrs, http, payload
 from .client_exceptions import *  # noqa
-from .client_exceptions import (ClientError, ClientOSError,
-                                ServerTimeoutError, WSServerHandshakeError)
+from .client_exceptions import (ClientError, ClientOSError, ServerTimeoutError,
+                                WSServerHandshakeError)
 from .client_reqrep import *  # noqa
 from .client_reqrep import ClientRequest, ClientResponse
 from .client_ws import ClientWebSocketResponse
 from .connector import *  # noqa
 from .connector import TCPConnector
 from .cookiejar import CookieJar
-from .helpers import (PY_35, CeilTimeout, TimeoutHandle,
-                      deprecated_noop, sentinel)
+from .helpers import (PY_35, CeilTimeout, TimeoutHandle, deprecated_noop,
+                      sentinel)
 from .http import WS_KEY, WebSocketReader, WebSocketWriter
 from .streams import FlowControlDataQueue
 
+
 __all__ = (client_exceptions.__all__ +  # noqa
            client_reqrep.__all__ +  # noqa
            connector_mod.__all__ +  # noqa
diff --git a/aiohttp/client_exceptions.py b/aiohttp/client_exceptions.py
index 75fbaad8058..98f6a764551 100644
--- a/aiohttp/client_exceptions.py
+++ b/aiohttp/client_exceptions.py
@@ -2,6 +2,7 @@
 
 from asyncio import TimeoutError
 
+
 __all__ = (
     'ClientError',
 
diff --git a/aiohttp/client_reqrep.py b/aiohttp/client_reqrep.py
index 6d26ef9d7e8..2c7860a3679 100644
--- a/aiohttp/client_reqrep.py
+++ b/aiohttp/client_reqrep.py
@@ -20,6 +20,7 @@
 from .log import client_logger
 from .streams import FlowControlStreamReader
 
+
 try:
     import cchardet as chardet
 except ImportError:  # pragma: no cover
diff --git a/aiohttp/client_ws.py b/aiohttp/client_ws.py
index acf19094988..05ef2272580 100644
--- a/aiohttp/client_ws.py
+++ b/aiohttp/client_ws.py
@@ -5,8 +5,8 @@
 
 from .client_exceptions import ClientError
 from .helpers import PY_35, PY_352, Timeout, call_later, create_future
-from .http import (WS_CLOSED_MESSAGE, WS_CLOSING_MESSAGE,
-                   WebSocketError, WSMessage, WSMsgType)
+from .http import (WS_CLOSED_MESSAGE, WS_CLOSING_MESSAGE, WebSocketError,
+                   WSMessage, WSMsgType)
 
 
 class ClientWebSocketResponse:
diff --git a/aiohttp/cookiejar.py b/aiohttp/cookiejar.py
index 27c2baede94..968b084716b 100644
--- a/aiohttp/cookiejar.py
+++ b/aiohttp/cookiejar.py
@@ -6,6 +6,7 @@
 from collections.abc import Mapping
 from http.cookies import Morsel
 from math import ceil
+
 from yarl import URL
 
 from .abc import AbstractCookieJar
diff --git a/aiohttp/formdata.py b/aiohttp/formdata.py
index b3a845cd873..a5effd7df73 100644
--- a/aiohttp/formdata.py
+++ b/aiohttp/formdata.py
@@ -6,6 +6,7 @@
 from . import hdrs, multipart, payload
 from .helpers import guess_filename
 
+
 __all__ = ('FormData',)
 
 
diff --git a/aiohttp/hdrs.py b/aiohttp/hdrs.py
index f994319e48d..cbbc16a345f 100644
--- a/aiohttp/hdrs.py
+++ b/aiohttp/hdrs.py
@@ -1,6 +1,7 @@
 """HTTP Headers constants."""
 from multidict import istr
 
+
 METH_ANY = '*'
 METH_CONNECT = 'CONNECT'
 METH_HEAD = 'HEAD'
diff --git a/aiohttp/helpers.py b/aiohttp/helpers.py
index 68d92984557..e3f0ee47703 100644
--- a/aiohttp/helpers.py
+++ b/aiohttp/helpers.py
@@ -24,6 +24,7 @@
 from . import hdrs
 from .abc import AbstractCookieJar
 
+
 try:
     from asyncio import ensure_future
 except ImportError:
diff --git a/aiohttp/http.py b/aiohttp/http.py
index 7ee7e76795a..e5f622e01e1 100644
--- a/aiohttp/http.py
+++ b/aiohttp/http.py
@@ -13,6 +13,7 @@
 from .http_writer import (HttpVersion, HttpVersion10, HttpVersion11,
                           PayloadWriter, StreamWriter)
 
+
 __all__ = (
     'HttpProcessingError', 'RESPONSES', 'SERVER_SOFTWARE',
 
diff --git a/aiohttp/http_parser.py b/aiohttp/http_parser.py
index 2cb680be540..971f991a70e 100644
--- a/aiohttp/http_parser.py
+++ b/aiohttp/http_parser.py
@@ -16,6 +16,7 @@
 from .log import internal_logger
 from .streams import EMPTY_PAYLOAD, FlowControlStreamReader
 
+
 __all__ = (
     'HttpParser', 'HttpRequestParser', 'HttpResponseParser',
     'RawRequestMessage', 'RawResponseMessage')
diff --git a/aiohttp/http_websocket.py b/aiohttp/http_websocket.py
index 01ae58d7fa4..9752b38e568 100644
--- a/aiohttp/http_websocket.py
+++ b/aiohttp/http_websocket.py
@@ -15,6 +15,7 @@
 from .http_exceptions import HttpBadRequest, HttpProcessingError
 from .log import ws_logger
 
+
 __all__ = ('WS_CLOSED_MESSAGE', 'WS_CLOSING_MESSAGE', 'WS_KEY',
            'WebSocketReader', 'WebSocketWriter', 'do_handshake',
            'WSMessage', 'WebSocketError', 'WSMsgType', 'WSCloseCode')
diff --git a/aiohttp/http_writer.py b/aiohttp/http_writer.py
index 8e6756054bf..49ce32a30c6 100644
--- a/aiohttp/http_writer.py
+++ b/aiohttp/http_writer.py
@@ -11,6 +11,7 @@
 from .abc import AbstractPayloadWriter
 from .helpers import create_future, noop
 
+
 __all__ = ('PayloadWriter', 'HttpVersion', 'HttpVersion10', 'HttpVersion11',
            'StreamWriter')
 
diff --git a/aiohttp/log.py b/aiohttp/log.py
index cfda0e5f070..48400473129 100644
--- a/aiohttp/log.py
+++ b/aiohttp/log.py
@@ -1,5 +1,6 @@
 import logging
 
+
 access_logger = logging.getLogger('aiohttp.access')
 client_logger = logging.getLogger('aiohttp.client')
 internal_logger = logging.getLogger('aiohttp.internal')
diff --git a/aiohttp/multipart.py b/aiohttp/multipart.py
index 635db1e1295..83201f21134 100644
--- a/aiohttp/multipart.py
+++ b/aiohttp/multipart.py
@@ -18,6 +18,7 @@
 from .payload import (BytesPayload, LookupError, Payload, StringPayload,
                       get_payload, payload_type)
 
+
 __all__ = ('MultipartReader', 'MultipartWriter', 'BodyPartReader',
            'BadContentDispositionHeader', 'BadContentDispositionParam',
            'parse_content_disposition', 'content_disposition_filename')
diff --git a/aiohttp/payload.py b/aiohttp/payload.py
index 7ee7876d412..b6334465ce7 100644
--- a/aiohttp/payload.py
+++ b/aiohttp/payload.py
@@ -12,6 +12,7 @@
                       parse_mimetype, sentinel)
 from .streams import DEFAULT_LIMIT, DataQueue, EofStream, StreamReader
 
+
 __all__ = ('PAYLOAD_REGISTRY', 'get_payload', 'payload_type', 'Payload',
            'BytesPayload', 'StringPayload', 'StreamReaderPayload',
            'IOBasePayload', 'BytesIOPayload', 'BufferedReaderPayload',
diff --git a/aiohttp/payload_streamer.py b/aiohttp/payload_streamer.py
index 2813469964b..f285e444c09 100644
--- a/aiohttp/payload_streamer.py
+++ b/aiohttp/payload_streamer.py
@@ -25,6 +25,7 @@ def file_sender(writer, file_name=None):
 
 from .payload import Payload, payload_type
 
+
 __all__ = ('streamer',)
 
 
diff --git a/aiohttp/pytest_plugin.py b/aiohttp/pytest_plugin.py
index e72d6a4eefa..7fb2b041d63 100644
--- a/aiohttp/pytest_plugin.py
+++ b/aiohttp/pytest_plugin.py
@@ -9,8 +9,9 @@
 from aiohttp.web import Application
 
 from .test_utils import unused_port as _unused_port
-from .test_utils import (RawTestServer, TestClient, TestServer,
-                         loop_context, setup_test_loop, teardown_test_loop)
+from .test_utils import (RawTestServer, TestClient, TestServer, loop_context,
+                         setup_test_loop, teardown_test_loop)
+
 
 try:
     import uvloop
diff --git a/aiohttp/resolver.py b/aiohttp/resolver.py
index 102a79b3731..53d4a2f3669 100644
--- a/aiohttp/resolver.py
+++ b/aiohttp/resolver.py
@@ -3,6 +3,7 @@
 
 from .abc import AbstractResolver
 
+
 __all__ = ('ThreadedResolver', 'AsyncResolver', 'DefaultResolver')
 
 try:
diff --git a/aiohttp/streams.py b/aiohttp/streams.py
index f64848a279d..9a0e01136a9 100644
--- a/aiohttp/streams.py
+++ b/aiohttp/streams.py
@@ -5,6 +5,7 @@
 from . import helpers
 from .log import internal_logger
 
+
 __all__ = (
     'EMPTY_PAYLOAD', 'EofStream', 'StreamReader', 'DataQueue', 'ChunksQueue',
     'FlowControlStreamReader',
diff --git a/aiohttp/web.py b/aiohttp/web.py
index e1f3d115efd..89130761a6f 100644
--- a/aiohttp/web.py
+++ b/aiohttp/web.py
@@ -29,6 +29,7 @@
 from .web_urldispatcher import PrefixedSubAppResource
 from .web_ws import *  # noqa
 
+
 __all__ = (web_protocol.__all__ +
            web_fileresponse.__all__ +
            web_request.__all__ +
diff --git a/aiohttp/web_exceptions.py b/aiohttp/web_exceptions.py
index 0a10d9d1f9a..f04b19a4db0 100644
--- a/aiohttp/web_exceptions.py
+++ b/aiohttp/web_exceptions.py
@@ -1,5 +1,6 @@
 from .web_response import Response
 
+
 __all__ = (
     'HTTPException',
     'HTTPError',
diff --git a/aiohttp/web_fileresponse.py b/aiohttp/web_fileresponse.py
index 4bd64a8da54..1848525b4e6 100644
--- a/aiohttp/web_fileresponse.py
+++ b/aiohttp/web_fileresponse.py
@@ -11,6 +11,7 @@
                              HTTPRequestRangeNotSatisfiable)
 from .web_response import StreamResponse
 
+
 __all__ = ('FileResponse',)
 
 
diff --git a/aiohttp/web_middlewares.py b/aiohttp/web_middlewares.py
index 8676a154ab2..8d17afb30f8 100644
--- a/aiohttp/web_middlewares.py
+++ b/aiohttp/web_middlewares.py
@@ -4,6 +4,7 @@
 from aiohttp.web_exceptions import HTTPMovedPermanently
 from aiohttp.web_urldispatcher import SystemRoute
 
+
 __all__ = (
     'normalize_path_middleware',
 )
diff --git a/aiohttp/web_protocol.py b/aiohttp/web_protocol.py
index f7bfdbef6b5..38d30c39342 100644
--- a/aiohttp/web_protocol.py
+++ b/aiohttp/web_protocol.py
@@ -18,6 +18,7 @@
 from .web_request import BaseRequest
 from .web_response import Response
 
+
 __all__ = ('RequestHandler', 'RequestPayloadError')
 
 ERROR = http.RawRequestMessage(
diff --git a/aiohttp/web_request.py b/aiohttp/web_request.py
index 204c7b5a258..eae340de1f6 100644
--- a/aiohttp/web_request.py
+++ b/aiohttp/web_request.py
@@ -16,6 +16,7 @@
 from .helpers import HeadersMixin, SimpleCookie, reify, sentinel
 from .web_exceptions import HTTPRequestEntityTooLarge
 
+
 __all__ = ('BaseRequest', 'FileField', 'Request')
 
 FileField = collections.namedtuple(
diff --git a/aiohttp/web_response.py b/aiohttp/web_response.py
index f1de7273224..f096c86556a 100644
--- a/aiohttp/web_response.py
+++ b/aiohttp/web_response.py
@@ -13,6 +13,7 @@
 from .helpers import HeadersMixin, SimpleCookie, sentinel
 from .http import RESPONSES, SERVER_SOFTWARE, HttpVersion10, HttpVersion11
 
+
 __all__ = ('ContentCoding', 'StreamResponse', 'Response', 'json_response')
 
 
diff --git a/aiohttp/web_server.py b/aiohttp/web_server.py
index 8e240e2e0c4..f936395df17 100644
--- a/aiohttp/web_server.py
+++ b/aiohttp/web_server.py
@@ -5,6 +5,7 @@
 from .web_protocol import RequestHandler
 from .web_request import BaseRequest
 
+
 __all__ = ('Server',)
 
 
diff --git a/aiohttp/web_urldispatcher.py b/aiohttp/web_urldispatcher.py
index 0afec9475ba..51bd96fcd8e 100644
--- a/aiohttp/web_urldispatcher.py
+++ b/aiohttp/web_urldispatcher.py
@@ -23,6 +23,7 @@
 from .web_fileresponse import FileResponse
 from .web_response import Response, StreamResponse
 
+
 __all__ = ('UrlDispatcher', 'UrlMappingMatchInfo',
            'AbstractResource', 'Resource', 'PlainResource', 'DynamicResource',
            'AbstractRoute', 'ResourceRoute',
diff --git a/aiohttp/web_ws.py b/aiohttp/web_ws.py
index fde267898cf..3f808765535 100644
--- a/aiohttp/web_ws.py
+++ b/aiohttp/web_ws.py
@@ -5,13 +5,14 @@
 from . import hdrs
 from .helpers import PY_35, PY_352, Timeout, call_later, create_future
 from .http import (WS_CLOSED_MESSAGE, WS_CLOSING_MESSAGE, HttpProcessingError,
-                   WebSocketError, WebSocketReader,
-                   WSMessage, WSMsgType, do_handshake)
+                   WebSocketError, WebSocketReader, WSMessage, WSMsgType,
+                   do_handshake)
 from .streams import FlowControlDataQueue
 from .web_exceptions import (HTTPBadRequest, HTTPInternalServerError,
                              HTTPMethodNotAllowed)
 from .web_response import StreamResponse
 
+
 __all__ = ('WebSocketResponse', 'WebSocketReady', 'MsgType', 'WSMsgType',)
 
 THRESHOLD_CONNLOST_ACCESS = 5
diff --git a/aiohttp/worker.py b/aiohttp/worker.py
index 0ccc4688634..212f1b1bb2c 100644
--- a/aiohttp/worker.py
+++ b/aiohttp/worker.py
@@ -13,6 +13,7 @@
 
 from .helpers import AccessLogger, create_future, ensure_future
 
+
 __all__ = ('GunicornWebWorker',
            'GunicornUVLoopWebWorker',
            'GunicornTokioWebWorker')
diff --git a/demos/chat/aiohttpdemo_chat/views.py b/demos/chat/aiohttpdemo_chat/views.py
index fc23cc34fc1..f1b0b77fd01 100644
--- a/demos/chat/aiohttpdemo_chat/views.py
+++ b/demos/chat/aiohttpdemo_chat/views.py
@@ -6,6 +6,7 @@
 import aiohttp_jinja2
 from aiohttp import web
 
+
 log = logging.getLogger(__name__)
 
 
diff --git a/demos/polls/aiohttpdemo_polls/__main__.py b/demos/polls/aiohttpdemo_polls/__main__.py
index 1ea11eb3a16..8d5028c2f3b 100644
--- a/demos/polls/aiohttpdemo_polls/__main__.py
+++ b/demos/polls/aiohttpdemo_polls/__main__.py
@@ -1,4 +1,6 @@
 import sys
+
 from aiohttpdemo_polls.main import main
 
+
 main(sys.argv[1:])
diff --git a/demos/polls/aiohttpdemo_polls/db.py b/demos/polls/aiohttpdemo_polls/db.py
index be9fef35351..d4a354abaea 100644
--- a/demos/polls/aiohttpdemo_polls/db.py
+++ b/demos/polls/aiohttpdemo_polls/db.py
@@ -1,6 +1,6 @@
+import aiopg.sa
 import sqlalchemy as sa
 
-import aiopg.sa
 
 __all__ = ['question', 'choice']
 
diff --git a/demos/polls/aiohttpdemo_polls/main.py b/demos/polls/aiohttpdemo_polls/main.py
index 58c2e31bfa1..2f2dbf00a97 100644
--- a/demos/polls/aiohttpdemo_polls/main.py
+++ b/demos/polls/aiohttpdemo_polls/main.py
@@ -5,15 +5,13 @@
 
 import jinja2
 
-from trafaret_config import commandline
-
-
 import aiohttp_jinja2
 from aiohttp import web
 from aiohttpdemo_polls.db import close_pg, init_pg
 from aiohttpdemo_polls.middlewares import setup_middlewares
 from aiohttpdemo_polls.routes import setup_routes
 from aiohttpdemo_polls.utils import TRAFARET
+from trafaret_config import commandline
 
 
 def init(loop, argv):
diff --git a/demos/polls/aiohttpdemo_polls/routes.py b/demos/polls/aiohttpdemo_polls/routes.py
index fc74a766689..ad12af3b749 100644
--- a/demos/polls/aiohttpdemo_polls/routes.py
+++ b/demos/polls/aiohttpdemo_polls/routes.py
@@ -2,6 +2,7 @@
 
 from .views import index, poll, results, vote
 
+
 PROJECT_ROOT = pathlib.Path(__file__).parent
 
 
diff --git a/demos/polls/aiohttpdemo_polls/utils.py b/demos/polls/aiohttpdemo_polls/utils.py
index 9283dd6cdd4..45688130b65 100644
--- a/demos/polls/aiohttpdemo_polls/utils.py
+++ b/demos/polls/aiohttpdemo_polls/utils.py
@@ -1,5 +1,6 @@
 import trafaret as T
 
+
 primitive_ip_regexp = r'^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$'
 
 TRAFARET = T.Dict({
diff --git a/demos/polls/tests/conftest.py b/demos/polls/tests/conftest.py
index f0d66a13e72..49c4ff5d343 100644
--- a/demos/polls/tests/conftest.py
+++ b/demos/polls/tests/conftest.py
@@ -5,6 +5,7 @@
 
 from aiohttpdemo_polls.main import init
 
+
 BASE_DIR = pathlib.Path(__file__).parent.parent
 
 
diff --git a/examples/client_ws.py b/examples/client_ws.py
index d054dec3482..233e6d45aa9 100755
--- a/examples/client_ws.py
+++ b/examples/client_ws.py
@@ -7,6 +7,7 @@
 
 import aiohttp
 
+
 try:
     import selectors
 except ImportError:
diff --git a/examples/legacy/srv.py b/examples/legacy/srv.py
index 0941273db6d..a5245cf1a35 100755
--- a/examples/legacy/srv.py
+++ b/examples/legacy/srv.py
@@ -10,6 +10,7 @@
 import aiohttp
 import aiohttp.server
 
+
 try:
     import ssl
 except ImportError:  # pragma: no cover
diff --git a/examples/legacy/tcp_protocol_parser.py b/examples/legacy/tcp_protocol_parser.py
index a9e2df096dd..a8766042c68 100755
--- a/examples/legacy/tcp_protocol_parser.py
+++ b/examples/legacy/tcp_protocol_parser.py
@@ -6,6 +6,7 @@
 
 import aiohttp
 
+
 try:
     import signal
 except ImportError:
diff --git a/examples/static_files.py b/examples/static_files.py
index 426242a8514..4ffd1ab60e1 100755
--- a/examples/static_files.py
+++ b/examples/static_files.py
@@ -2,6 +2,7 @@
 
 from aiohttp import web
 
+
 app = web.Application()
 app.router.add_static('/', pathlib.Path(__file__).parent, show_index=True)
 
diff --git a/examples/web_ws.py b/examples/web_ws.py
index 154a3ca4e0d..7660f931ea3 100755
--- a/examples/web_ws.py
+++ b/examples/web_ws.py
@@ -8,6 +8,7 @@
 from aiohttp.web import (Application, Response, WebSocketResponse, WSMsgType,
                          run_app)
 
+
 WS_FILE = os.path.join(os.path.dirname(__file__), 'websocket.html')
 
 
diff --git a/tests/conftest.py b/tests/conftest.py
index 2cfc3bdd0ca..429fc743705 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -4,6 +4,7 @@
 
 import pytest
 
+
 pytest_plugins = 'aiohttp.pytest_plugin'
 
 
diff --git a/tests/test_http_parser.py b/tests/test_http_parser.py
index 426af2e0df0..6fe2b026ad4 100644
--- a/tests/test_http_parser.py
+++ b/tests/test_http_parser.py
@@ -14,6 +14,7 @@
 from aiohttp.http_parser import (DeflateBuffer, HttpPayloadParser,
                                  HttpRequestParserPy, HttpResponseParserPy)
 
+
 REQUEST_PARSERS = [HttpRequestParserPy]
 RESPONSE_PARSERS = [HttpResponseParserPy]
 
diff --git a/tests/test_http_stream_writer.py b/tests/test_http_stream_writer.py
index 1ba15cd72a2..bf5ef8be280 100644
--- a/tests/test_http_stream_writer.py
+++ b/tests/test_http_stream_writer.py
@@ -5,6 +5,7 @@
 
 from aiohttp.http_writer import CORK, PayloadWriter, StreamWriter
 
+
 has_ipv6 = socket.has_ipv6
 if has_ipv6:
     # The socket.has_ipv6 flag may be True if Python was built with IPv6
diff --git a/tests/test_py35/test_streams_35.py b/tests/test_py35/test_streams_35.py
index ef25bcca52d..1644e230708 100644
--- a/tests/test_py35/test_streams_35.py
+++ b/tests/test_py35/test_streams_35.py
@@ -2,6 +2,7 @@
 
 from aiohttp import streams
 
+
 DATA = b'line1\nline2\nline3\n'
 
 
diff --git a/tests/test_pytest_plugin.py b/tests/test_pytest_plugin.py
index 9001f38d35d..9b6665d1f47 100644
--- a/tests/test_pytest_plugin.py
+++ b/tests/test_pytest_plugin.py
@@ -1,7 +1,9 @@
 import re
 import sys
+
 import pytest
 
+
 pytest_plugins = 'pytester'
 
 
diff --git a/tests/test_resolver.py b/tests/test_resolver.py
index 713134b3fbf..b824bdbb412 100644
--- a/tests/test_resolver.py
+++ b/tests/test_resolver.py
@@ -7,6 +7,7 @@
 
 from aiohttp.resolver import AsyncResolver, DefaultResolver, ThreadedResolver
 
+
 try:
     import aiodns
     gethostbyname = hasattr(aiodns.DNSResolver, 'gethostbyname')
diff --git a/tests/test_run_app.py b/tests/test_run_app.py
index e3f37775aba..13e4db0ba90 100644
--- a/tests/test_run_app.py
+++ b/tests/test_run_app.py
@@ -3,7 +3,6 @@
 import os
 import socket
 import ssl
-
 from io import StringIO
 from unittest import mock
 from uuid import uuid4
diff --git a/tests/test_web_functional.py b/tests/test_web_functional.py
index 94f07b66c8c..3f673c2ce9b 100644
--- a/tests/test_web_functional.py
+++ b/tests/test_web_functional.py
@@ -12,6 +12,7 @@
 import aiohttp
 from aiohttp import FormData, HttpVersion10, HttpVersion11, multipart, web
 
+
 try:
     import ssl
 except:
diff --git a/tests/test_web_sendfile_functional.py b/tests/test_web_sendfile_functional.py
index fdea28bde64..caecfd9dc91 100644
--- a/tests/test_web_sendfile_functional.py
+++ b/tests/test_web_sendfile_functional.py
@@ -7,6 +7,7 @@
 import aiohttp
 from aiohttp import web
 
+
 try:
     import ssl
 except:
diff --git a/tests/test_worker.py b/tests/test_worker.py
index 252e937c58a..88f0b4a4d85 100644
--- a/tests/test_worker.py
+++ b/tests/test_worker.py
@@ -10,6 +10,7 @@
 from aiohttp import helpers
 from aiohttp.test_utils import make_mocked_coro
 
+
 base_worker = pytest.importorskip('aiohttp.worker')