diff --git a/flask/config.py b/flask/config.py
index 697add71..c4b56f72 100644
--- a/flask/config.py
+++ b/flask/config.py
@@ -14,6 +14,7 @@ import types
 import errno
 
 from werkzeug.utils import import_string
+
 from ._compat import string_types, iteritems
 from . import json
 
diff --git a/flask/exthook.py b/flask/exthook.py
index d8842802..8cceef55 100644
--- a/flask/exthook.py
+++ b/flask/exthook.py
@@ -22,6 +22,7 @@
 import sys
 import os
 import warnings
+
 from ._compat import reraise
 
 
diff --git a/flask/globals.py b/flask/globals.py
index 0b70a3ef..ab140f15 100644
--- a/flask/globals.py
+++ b/flask/globals.py
@@ -11,6 +11,7 @@
 """
 
 from functools import partial
+
 from werkzeug.local import LocalStack, LocalProxy
 
 
diff --git a/flask/helpers.py b/flask/helpers.py
index 828f5840..2ee0b5d8 100644
--- a/flask/helpers.py
+++ b/flask/helpers.py
@@ -18,7 +18,6 @@ from time import time
 from zlib import adler32
 from threading import RLock
 import unicodedata
-from werkzeug.routing import BuildError
 from functools import update_wrapper
 
 try:
@@ -26,6 +25,7 @@ try:
 except ImportError:
     from urlparse import quote as url_quote
 
+from werkzeug.routing import BuildError
 from werkzeug.datastructures import Headers, Range
 from werkzeug.exceptions import BadRequest, NotFound, \
     RequestedRangeNotSatisfiable
diff --git a/flask/json.py b/flask/json.py
index bf8a8843..430e458f 100644
--- a/flask/json.py
+++ b/flask/json.py
@@ -11,17 +11,16 @@
 import io
 import uuid
 from datetime import date
-from .globals import current_app, request
-from ._compat import text_type, PY2
-from .ctx import has_request_context
 
 from werkzeug.http import http_date
 from jinja2 import Markup
-
 # Use the same json implementation as itsdangerous on which we
 # depend anyways.
 from itsdangerous import json as _json
 
+from .globals import current_app, request
+from ._compat import text_type, PY2
+from .ctx import has_request_context
 
 # Figure out if simplejson escapes slashes.  This behavior was changed
 # from one version to another without reason.
diff --git a/flask/logging.py b/flask/logging.py
index 3f888a75..e263452b 100644
--- a/flask/logging.py
+++ b/flask/logging.py
@@ -12,10 +12,11 @@
 from __future__ import absolute_import
 
 import sys
-
-from werkzeug.local import LocalProxy
 from logging import getLogger, StreamHandler, Formatter, getLoggerClass, \
      DEBUG, ERROR
+
+from werkzeug.local import LocalProxy
+
 from .globals import _request_ctx_stack
 
 
diff --git a/flask/sessions.py b/flask/sessions.py
index 525ff246..5b7b9c2e 100644
--- a/flask/sessions.py
+++ b/flask/sessions.py
@@ -13,14 +13,15 @@ import uuid
 import hashlib
 from base64 import b64encode, b64decode
 from datetime import datetime
+
 from werkzeug.http import http_date, parse_date
 from werkzeug.datastructures import CallbackDict
+from itsdangerous import URLSafeTimedSerializer, BadSignature
+
 from . import Markup, json
 from ._compat import iteritems, text_type
 from .helpers import total_seconds
 
-from itsdangerous import URLSafeTimedSerializer, BadSignature
-
 
 class SessionMixin(object):
     """Expands a basic dictionary with an accessors that are expected
diff --git a/flask/testing.py b/flask/testing.py
index 31600245..9fe69bdb 100644
--- a/flask/testing.py
+++ b/flask/testing.py
@@ -10,9 +10,11 @@
     :license: BSD, see LICENSE for more details.
 """
 
-import werkzeug
 from contextlib import contextmanager
+
+import werkzeug
 from werkzeug.test import Client, EnvironBuilder
+
 from flask import _request_ctx_stack
 
 try: