diff --git a/swiftclient/client.py b/swiftclient/client.py
index 44066891..f0711822 100644
--- a/swiftclient/client.py
+++ b/swiftclient/client.py
@@ -39,7 +39,7 @@ from swiftclient.utils import (
 # Default is 100, increase to 256
 http_client._MAXHEADERS = 256
 
-VERSIONFUL_AUTH_PATH = re.compile('v[2-3](?:\.0)?$')
+VERSIONFUL_AUTH_PATH = re.compile(r'v[2-3](?:\.0)?$')
 AUTH_VERSIONS_V1 = ('1.0', '1', 1)
 AUTH_VERSIONS_V2 = ('2.0', '2', 2)
 AUTH_VERSIONS_V3 = ('3.0', '3', 3)
diff --git a/swiftclient/service.py b/swiftclient/service.py
index 8f3648ee..2663ace4 100644
--- a/swiftclient/service.py
+++ b/swiftclient/service.py
@@ -173,6 +173,7 @@ def _build_default_global_options():
         'container_threads': 10
     }
 
+
 _default_global_options = _build_default_global_options()
 
 _default_local_options = {
diff --git a/swiftclient/shell.py b/swiftclient/shell.py
index 9ea5e952..0459533d 100755
--- a/swiftclient/shell.py
+++ b/swiftclient/shell.py
@@ -58,6 +58,7 @@ def immediate_exit(signum, frame):
     stderr.write(" Aborted\n")
     os_exit(2)
 
+
 st_delete_options = '''[--all] [--leave-segments]
                     [--object-threads <threads>]
                     [--container-threads <threads>]
diff --git a/tests/unit/test_shell.py b/tests/unit/test_shell.py
index f5d2f15b..7c8faa29 100644
--- a/tests/unit/test_shell.py
+++ b/tests/unit/test_shell.py
@@ -1822,7 +1822,7 @@ class TestShell(unittest.TestCase):
         argv = ["", "tempurl", "GET", "60", '/v1/a/c',
                     "secret_key", "--absolute", '--prefix-based']
         with CaptureOutput(suppress_systemexit=True) as output:
-                swiftclient.shell.main(argv)
+            swiftclient.shell.main(argv)
         self.assertEqual(expected, output.err,
                          'Expected %r but got %r for path %r' %
                          (expected, output.err, '/v1/a/c'))
@@ -1832,7 +1832,7 @@ class TestShell(unittest.TestCase):
             argv = ["", "tempurl", "GET", bad_time, '/v1/a/c/o',
                         "secret_key", "--absolute"]
             with CaptureOutput(suppress_systemexit=True) as output:
-                    swiftclient.shell.main(argv)
+                swiftclient.shell.main(argv)
             self.assertEqual(expected, output.err,
                              'Expected %r but got %r for time %r' %
                              (expected, output.err, bad_time))
diff --git a/tox.ini b/tox.ini
index 84a54197..e029efd9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -79,7 +79,8 @@ commands=
 # H403: multi line docstrings should end on a new line
 # H404: multi line docstring should start without a leading new line
 # H405: multi line docstring summary not separated with an empty line
-ignore = H101,H301,H306,H401,H403,H404,H405
+# W504: line break after binary operator
+ignore = H101,H301,H306,H401,H403,H404,H405,W504
 # H106: Don’t put vim configuration in source files
 # H203: Use assertIs(Not)None to check for None
 enable-extensions=H106,H203