diff --git a/swift3/controllers/acl.py b/swift3/controllers/acl.py
index 80050ca3..e9943276 100644
--- a/swift3/controllers/acl.py
+++ b/swift3/controllers/acl.py
@@ -25,6 +25,7 @@ XMLNS_XSI = 'http://www.w3.org/2001/XMLSchema-instance'
 
 MAX_ACL_BODY_SIZE = 200 * 1024
 
+
 def add_canonical_user(parent, tag, user, nsmap=None):
     """
     Create an element for cannonical user.
@@ -91,10 +92,11 @@ def swift_acl_translate(acl, group='', user='', xml=False):
                                       ['HTTP_X_CONTAINER_READ',
                                        '.r:*,.rlistings']]
 
-    #TODO: if there's a way to get group and user, this should work for
+    # TODO: if there's a way to get group and user, this should work for
     # private:
-    #swift_acl['private'] = [['HTTP_X_CONTAINER_WRITE',  group + ':' + user], \
-    #                  ['HTTP_X_CONTAINER_READ', group + ':' + user]]
+    # swift_acl['private'] = \
+    #     [['HTTP_X_CONTAINER_WRITE',  group + ':' + user], \
+    #      ['HTTP_X_CONTAINER_READ', group + ':' + user]]
     swift_acl['private'] = [['HTTP_X_CONTAINER_WRITE', '.'],
                             ['HTTP_X_CONTAINER_READ', '.']]
     if xml:
diff --git a/swift3/controllers/base.py b/swift3/controllers/base.py
index 7f1c412a..e5730bdc 100644
--- a/swift3/controllers/base.py
+++ b/swift3/controllers/base.py
@@ -23,6 +23,7 @@ from swift3.cfg import CONF
 
 LOGGER = get_logger(CONF, log_route='swift3')
 
+
 def bucket_operation(func=None, err_resp=None, err_msg=None):
     """
     A decorator to ensure that the request is a bucket operation.  If the
@@ -49,6 +50,7 @@ def bucket_operation(func=None, err_resp=None, err_msg=None):
     else:
         return _bucket_operation
 
+
 def object_operation(func):
     """
     A decorator to ensure that the request is an object operation.  If the
diff --git a/swift3/etree.py b/swift3/etree.py
index e33fa7c0..715408eb 100644
--- a/swift3/etree.py
+++ b/swift3/etree.py
@@ -27,6 +27,7 @@ XMLNS_S3 = 'http://s3.amazonaws.com/doc/2006-03-01/'
 
 LOGGER = get_logger(CONF, log_route='swift3')
 
+
 class DocumentInvalid(S3Exception, lxml.etree.DocumentInvalid):
     pass
 
diff --git a/swift3/middleware.py b/swift3/middleware.py
index bbca1411..4533db19 100644
--- a/swift3/middleware.py
+++ b/swift3/middleware.py
@@ -62,6 +62,7 @@ from swift3.response import ErrorResponse, InternalError, MethodNotAllowed, \
     ResponseBase
 from swift3.cfg import CONF
 
+
 def validate_bucket_name(name):
     """
     Validates the name of the bucket against S3 criteria,
@@ -104,7 +105,7 @@ class Swift3Middleware(object):
             if isinstance(err_resp, InternalError):
                 self.logger.exception(err_resp)
             resp = err_resp
-        except Exception, e:
+        except Exception as e:
             self.logger.exception(e)
             resp = InternalError(reason=e)
 
diff --git a/swift3/test/unit/test_cfg.py b/swift3/test/unit/test_cfg.py
index 8447db5e..8963d9ec 100644
--- a/swift3/test/unit/test_cfg.py
+++ b/swift3/test/unit/test_cfg.py
@@ -17,6 +17,7 @@ import unittest
 
 from swift3.cfg import Config
 
+
 class TestSwift3Cfg(unittest.TestCase):
     def test_config(self):
         conf = Config(
diff --git a/swift3/test/unit/test_logging.py b/swift3/test/unit/test_logging.py
index 7032f4b8..3802d7db 100644
--- a/swift3/test/unit/test_logging.py
+++ b/swift3/test/unit/test_logging.py
@@ -25,7 +25,6 @@ class TestSwift3Logging(Swift3TestCase):
     def setUp(self):
         super(TestSwift3Logging, self).setUp()
 
-
     def test_object_logging_GET(self):
         req = Request.blank('/bucket/object?logging',
                             environ={'REQUEST_METHOD': 'GET'},
diff --git a/swift3/test/unit/test_middleware.py b/swift3/test/unit/test_middleware.py
index 662ac96f..d4ca716b 100644
--- a/swift3/test/unit/test_middleware.py
+++ b/swift3/test/unit/test_middleware.py
@@ -136,12 +136,10 @@ class TestSwift3Middleware(Swift3TestCase):
                'response-content-encoding&response-content-language&'
                'response-content-type&response-expires', {})
 
-        str1 = canonical_string('/', headers=
-                                {'Content-Type': None,
-                                 'X-Amz-Something': 'test'})
-        str2 = canonical_string('/', headers=
-                                {'Content-Type': '',
-                                 'X-Amz-Something': 'test'})
+        str1 = canonical_string('/', headers={'Content-Type': None,
+                                              'X-Amz-Something': 'test'})
+        str2 = canonical_string('/', headers={'Content-Type': '',
+                                              'X-Amz-Something': 'test'})
         str3 = canonical_string('/', headers={'X-Amz-Something': 'test'})
 
         self.assertEquals(str1, str2)
diff --git a/swift3/utils.py b/swift3/utils.py
index b09ef252..c17f94cd 100644
--- a/swift3/utils.py
+++ b/swift3/utils.py
@@ -15,6 +15,7 @@
 
 import re
 
+
 def camel_to_snake(camel):
     return re.sub('(.)([A-Z])', r'\1_\2', camel).lower()
 
diff --git a/tox.ini b/tox.ini
index 0ba1063f..98a5ccdb 100644
--- a/tox.ini
+++ b/tox.ini
@@ -54,6 +54,6 @@ downloadcache = ~/cache/pip
 [flake8]
 # follow the same style guidelines with swift
 ignore = H
-select = H102,H103,H201,H501,H903
+select = F,E,W,H102,H103,H501,H903,H231
 exclude = .venv,.git,.tox,dist,doc,*egg,build
 show-source = True