diff --git a/glance_store/_drivers/s3.py b/glance_store/_drivers/s3.py
index 41d87d3f..9c748313 100644
--- a/glance_store/_drivers/s3.py
+++ b/glance_store/_drivers/s3.py
@@ -926,7 +926,7 @@ def get_s3_location(s3_host):
         's3-sa-east-1.amazonaws.com': 'sa-east-1'
     }
     # strip off scheme and port if present
-    key = re.sub('^(https?://)?(?P<host>[^:]+[^/])(:[0-9]+)?/?$',
-                 '\g<host>',
+    key = re.sub(r'^(https?://)?(?P<host>[^:]+[^/])(:[0-9]+)?/?$',
+                 r'\g<host>',
                  s3_host)
     return locations.get(key, '')
diff --git a/glance_store/_drivers/swift/store.py b/glance_store/_drivers/swift/store.py
index 7c1d9e67..9c827188 100644
--- a/glance_store/_drivers/swift/store.py
+++ b/glance_store/_drivers/swift/store.py
@@ -768,6 +768,7 @@ def Store(conf, backend=None):
         return MultiTenantStore(conf, backend=backend)
     return SingleTenantStore(conf, backend=backend)
 
+
 Store.OPTIONS = _SWIFT_OPTS + sutils.swift_opts + buffered.BUFFERING_OPTS
 
 
@@ -1122,7 +1123,7 @@ class BaseStore(driver.Store):
                     try:
                         connection.delete_object(obj_container,
                                                  segment['name'])
-                    except swiftclient.ClientException as e:
+                    except swiftclient.ClientException:
                         msg = _('Unable to delete segment %(segment_name)s')
                         msg = msg % {'segment_name': segment['name']}
                         LOG.exception(msg)
diff --git a/glance_store/_drivers/swift/utils.py b/glance_store/_drivers/swift/utils.py
index 4a1d8be4..7285ba15 100644
--- a/glance_store/_drivers/swift/utils.py
+++ b/glance_store/_drivers/swift/utils.py
@@ -223,6 +223,6 @@ class SwiftParams(object):
                     reference['auth_version'] = av
 
                 account_params[ref] = reference
-            except (ValueError, SyntaxError, configparser.NoOptionError) as e:
+            except (ValueError, SyntaxError, configparser.NoOptionError):
                 LOG.exception(_LE("Invalid format of swift store config cfg"))
         return account_params
diff --git a/glance_store/exceptions.py b/glance_store/exceptions.py
index ff6377dd..a20440fc 100644
--- a/glance_store/exceptions.py
+++ b/glance_store/exceptions.py
@@ -51,7 +51,7 @@ class GlanceStoreException(Exception):
             if kwargs:
                 message = message % kwargs
         except Exception:
-                pass
+            pass
         self.msg = message
         super(GlanceStoreException, self).__init__(message)
 
diff --git a/glance_store/tests/unit/test_swift_store.py b/glance_store/tests/unit/test_swift_store.py
index aa22e4cd..8d82053e 100644
--- a/glance_store/tests/unit/test_swift_store.py
+++ b/glance_store/tests/unit/test_swift_store.py
@@ -47,9 +47,9 @@ from glance_store.tests.unit import test_store_capabilities
 
 CONF = cfg.CONF
 
-FAKE_UUID = lambda: str(uuid.uuid4())
-FAKE_UUID2 = lambda: str(uuid.uuid4())
-FAKE_UUID3 = lambda: str(uuid.uuid4())
+FAKE_UUID = lambda: str(uuid.uuid4())  # noqa: E731
+FAKE_UUID2 = lambda: str(uuid.uuid4())  # noqa: E731
+FAKE_UUID3 = lambda: str(uuid.uuid4())  # noqa: E731
 
 
 Store = swift.Store
diff --git a/glance_store/tests/unit/test_swift_store_multibackend.py b/glance_store/tests/unit/test_swift_store_multibackend.py
index 7d217eae..83b85170 100644
--- a/glance_store/tests/unit/test_swift_store_multibackend.py
+++ b/glance_store/tests/unit/test_swift_store_multibackend.py
@@ -46,8 +46,8 @@ from glance_store.tests.unit import test_store_capabilities
 
 CONF = cfg.CONF
 
-FAKE_UUID = lambda: str(uuid.uuid4())
-FAKE_UUID2 = lambda: str(uuid.uuid4())
+FAKE_UUID = lambda: str(uuid.uuid4())  # noqa: E731
+FAKE_UUID2 = lambda: str(uuid.uuid4())  # noqa: E731
 
 Store = swift.Store
 FIVE_KB = 5 * units.Ki
diff --git a/lower-constraints.txt b/lower-constraints.txt
index c00786ab..addb356a 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -17,12 +17,10 @@ eventlet==0.18.2
 extras==1.0.0
 fasteners==0.14.1
 fixtures==3.0.0
-flake8==2.5.5
 future==0.16.0
 gitdb2==2.0.3
 GitPython==2.1.8
 greenlet==0.4.13
-hacking==0.12.0
 httplib2==0.9.1
 idna==2.6
 imagesize==1.0.0
@@ -55,9 +53,7 @@ os-testr==1.0.0
 packaging==17.1
 Parsley==1.3
 pbr==3.1.1
-pep8==1.5.7
 prettytable==0.7.2
-pyflakes==0.8.1
 Pygments==2.2.0
 pyparsing==2.2.0
 pyperclip==1.6.0
diff --git a/test-requirements.txt b/test-requirements.txt
index 1f745a17..38cd8a26 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 # Metrics and style
-hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
+hacking>=3.0,<3.1.0 # Apache-2.0
 
 # Documentation style
 doc8>=0.6.0 # Apache-2.0
diff --git a/tools/install_venv.py b/tools/install_venv.py
index cbea89af..e2382155 100644
--- a/tools/install_venv.py
+++ b/tools/install_venv.py
@@ -69,5 +69,6 @@ def main(argv):
                         'setup.py', 'develop'])
     print_help()
 
+
 if __name__ == '__main__':
     main(sys.argv)
diff --git a/tox.ini b/tox.ini
index b4248c16..749937c6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -59,7 +59,9 @@ ignore-path = .venv,.git,.tox,*glance_store/locale*,*lib/python*,glance_store.eg
 # H301  one import per line
 # H404  multi line docstring should start with a summary
 # H405  multi line docstring summary not separated with an empty line
-ignore = H301,H404,H405
+# W503 line break before binary operator
+# W504 line break after binary operator
+ignore = H301,H404,H405,W503,W504
 exclude = .venv,.git,.tox,dist,doc,etc,*glance_store/locale*,*lib/python*,*egg,build
 
 [testenv:lower-constraints]