diff --git a/nova/api/ec2/ec2utils.py b/nova/api/ec2/ec2utils.py
index 3134e309e51f..9fb1582dba4f 100644
--- a/nova/api/ec2/ec2utils.py
+++ b/nova/api/ec2/ec2utils.py
@@ -232,7 +232,7 @@ def ec2_vol_id_to_uuid(ec2_id):
     return get_volume_uuid_from_int_id(ctxt, int_id)
 
 
-_ms_time_regex = re.compile('^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3,6}Z$')
+_ms_time_regex = re.compile(r'^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3,6}Z$')
 
 
 def status_to_ec2_attach_status(volume):
@@ -462,4 +462,4 @@ def regex_from_ec2_regex(ec2_re):
                 py_re += '\\\\' + next_char
         else:
             py_re += re.escape(char)
-    return '\A%s\Z(?s)' % py_re
+    return r'(?s)\A%s\Z' % py_re
diff --git a/nova/api/openstack/__init__.py b/nova/api/openstack/__init__.py
index 087c447b2116..d6429cc416a3 100644
--- a/nova/api/openstack/__init__.py
+++ b/nova/api/openstack/__init__.py
@@ -166,7 +166,7 @@ class ProjectMapper(APIMapper):
         # NOTE(sdague): project_id parameter is only valid if its hex
         # or hex + dashes (note, integers are a subset of this). This
         # is required to hand our overlaping routes issues.
-        project_id_regex = '[0-9a-f\-]+'
+        project_id_regex = '[0-9a-f-]+'
         if CONF.osapi_v21.project_id_regex:
             project_id_regex = CONF.osapi_v21.project_id_regex
 
diff --git a/nova/api/openstack/compute/schemas/flavor_manage.py b/nova/api/openstack/compute/schemas/flavor_manage.py
index 08899a21eee1..ad3ebe57a7a2 100644
--- a/nova/api/openstack/compute/schemas/flavor_manage.py
+++ b/nova/api/openstack/compute/schemas/flavor_manage.py
@@ -39,7 +39,7 @@ create = {
                 # positive ( > 0) float
                 'rxtx_factor': {
                     'type': ['number', 'string'],
-                    'pattern': '^[0-9]+(\.[0-9]+)?$',
+                    'pattern': r'^[0-9]+(\.[0-9]+)?$',
                     'minimum': 0, 'exclusiveMinimum': True,
                     # maximum's value is limited to db constant's
                     # SQL_SP_FLOAT_MAX (in nova/db/constants.py)
diff --git a/nova/api/openstack/compute/schemas/servers.py b/nova/api/openstack/compute/schemas/servers.py
index 1c71cf688957..1b048e170423 100644
--- a/nova/api/openstack/compute/schemas/servers.py
+++ b/nova/api/openstack/compute/schemas/servers.py
@@ -136,7 +136,7 @@ _hints = {
         'build_near_host_ip': parameter_types.ip_address,
         'cidr': {
             'type': 'string',
-            'pattern': '^\/[0-9a-f.:]+$'
+            'pattern': '^/[0-9a-f.:]+$'
         },
     },
     # NOTE: As this Mail:
diff --git a/nova/api/validation/validators.py b/nova/api/validation/validators.py
index f36393463c18..eef05c72827e 100644
--- a/nova/api/validation/validators.py
+++ b/nova/api/validation/validators.py
@@ -75,7 +75,7 @@ def _validate_cidr_format(cidr):
         return False
     if '/' not in cidr:
         return False
-    if re.search('\s', cidr):
+    if re.search(r'\s', cidr):
         return False
     return True
 
diff --git a/nova/block_device.py b/nova/block_device.py
index 89c203b1d774..2f1afb07332a 100644
--- a/nova/block_device.py
+++ b/nova/block_device.py
@@ -419,7 +419,7 @@ def validate_and_default_volume_size(bdm):
                 details=_("Invalid volume_size."))
 
 
-_ephemeral = re.compile('^ephemeral(\d|[1-9]\d+)$')
+_ephemeral = re.compile(r'^ephemeral(\d|[1-9]\d+)$')
 
 
 def is_ephemeral(device_name):
@@ -499,7 +499,7 @@ def strip_prefix(device_name):
     return _pref.sub('', device_name) if device_name else device_name
 
 
-_nums = re.compile('\d+')
+_nums = re.compile(r'\d+')
 
 
 def get_device_letter(device_name):
diff --git a/nova/conf/hyperv.py b/nova/conf/hyperv.py
index d9ba3c5b1223..caa7a8702b8d 100644
--- a/nova/conf/hyperv.py
+++ b/nova/conf/hyperv.py
@@ -149,7 +149,7 @@ Possible values:
 """),
     cfg.StrOpt('qemu_img_cmd',
         default="qemu-img.exe",
-        help="""
+        help=r"""
 qemu-img command
 
 qemu-img is required for some of the image related operations
diff --git a/nova/conf/serial_console.py b/nova/conf/serial_console.py
index 233aa70faedf..2781a2765b58 100644
--- a/nova/conf/serial_console.py
+++ b/nova/conf/serial_console.py
@@ -36,7 +36,7 @@ This service is typically executed on the controller node.
     cfg.StrOpt('port_range',
         default=DEFAULT_PORT_RANGE,
         regex=r'^\d+:\d+$',
-        help="""
+        help=r"""
 A range of TCP ports a guest can use for its backend.
 
 Each instance which gets created will use one port out of this range. If the
@@ -45,9 +45,9 @@ instance won't get launched.
 
 Possible values:
 
-* Each string which passes the regex ``^\d+:\d+$`` For example ``10000:20000``.
-  Be sure that the first port number is lower than the second port number
-  and that both are in range from 0 to 65535.
+* Each string which passes the regex ``^\d+:\d+$`` For example
+  ``10000:20000``. Be sure that the first port number is lower than the second
+  port number and that both are in range from 0 to 65535.
 """),
     # TODO(macsz) check if WS protocol is still being used
     cfg.URIOpt('base_url',
diff --git a/nova/hacking/checks.py b/nova/hacking/checks.py
index 5ac954fa54eb..09a689dc5aa2 100644
--- a/nova/hacking/checks.py
+++ b/nova/hacking/checks.py
@@ -48,10 +48,10 @@ virt_config_re = re.compile(
     r"CONF\.import_opt\('.*?', 'nova\.virt\.(\w+)('|.)")
 asse_trueinst_re = re.compile(
                      r"(.)*assertTrue\(isinstance\((\w|\.|\'|\"|\[|\])+, "
-                     "(\w|\.|\'|\"|\[|\])+\)\)")
+                     r"(\w|\.|\'|\"|\[|\])+\)\)")
 asse_equal_type_re = re.compile(
                        r"(.)*assertEqual\(type\((\w|\.|\'|\"|\[|\])+\), "
-                       "(\w|\.|\'|\"|\[|\])+\)")
+                       r"(\w|\.|\'|\"|\[|\])+\)")
 asse_equal_in_end_with_true_or_false_re = re.compile(r"assertEqual\("
                     r"(\w|[][.'\"])+ in (\w|[][.'\", ])+, (True|False)\)")
 asse_equal_in_start_with_true_or_false_re = re.compile(r"assertEqual\("
@@ -76,7 +76,7 @@ asse_raises_regexp = re.compile(r"assertRaisesRegexp\(")
 conf_attribute_set_re = re.compile(r"CONF\.[a-z0-9_.]+\s*=\s*\w")
 translated_log = re.compile(
     r"(.)*LOG\.(audit|error|info|critical|exception)"
-    "\(\s*_\(\s*('|\")")
+    r"\(\s*_\(\s*('|\")")
 mutable_default_args = re.compile(r"^\s*def .+\((.+=\{\}|.+=\[\])")
 string_translation = re.compile(r"[^_]*_\(\s*('|\")")
 underscore_import_check = re.compile(r"(.)*import _(.)*")
diff --git a/nova/network/linux_net.py b/nova/network/linux_net.py
index 7a2d22fd11a1..a57f2a4503d6 100644
--- a/nova/network/linux_net.py
+++ b/nova/network/linux_net.py
@@ -690,7 +690,7 @@ def ensure_vpn_forward(public_ip, port, private_ip):
 def ensure_floating_forward(floating_ip, fixed_ip, device, network):
     """Ensure floating IP forwarding rule."""
     # NOTE(vish): Make sure we never have duplicate rules for the same ip
-    regex = '.*\s+%s(/32|\s+|$)' % floating_ip
+    regex = r'.*\s+%s(/32|\s+|$)' % floating_ip
     num_rules = iptables_manager.ipv4['nat'].remove_rules_regex(regex)
     if num_rules:
         LOG.warning('Removed %(num)d duplicate rules for floating IP '
diff --git a/nova/network/manager.py b/nova/network/manager.py
index c3c1b3ac8f27..fa509dc6f71e 100644
--- a/nova/network/manager.py
+++ b/nova/network/manager.py
@@ -70,7 +70,7 @@ def get_my_linklocal(interface):
     try:
         if_str = processutils.execute(
             'ip', '-f', 'inet6', '-o', 'addr', 'show', interface)
-        condition = '\s+inet6\s+([0-9a-f:]+)/\d+\s+scope\s+link'
+        condition = r'\s+inet6\s+([0-9a-f:]+)/\d+\s+scope\s+link'
         links = [re.search(condition, x) for x in if_str[0].split('\n')]
         address = [w.group(1) for w in links if w is not None]
         if address[0] is not None:
diff --git a/nova/pci/utils.py b/nova/pci/utils.py
index 221508574aa3..5b0a0821f944 100644
--- a/nova/pci/utils.py
+++ b/nova/pci/utils.py
@@ -26,9 +26,9 @@ from nova import exception
 
 LOG = logging.getLogger(__name__)
 
-PCI_VENDOR_PATTERN = "^(hex{4})$".replace("hex", "[\da-fA-F]")
+PCI_VENDOR_PATTERN = "^(hex{4})$".replace("hex", r"[\da-fA-F]")
 _PCI_ADDRESS_PATTERN = ("^(hex{4}):(hex{2}):(hex{2}).(oct{1})$".
-                                             replace("hex", "[\da-fA-F]").
+                                             replace("hex", r"[\da-fA-F]").
                                              replace("oct", "[0-7]"))
 _PCI_ADDRESS_REGEX = re.compile(_PCI_ADDRESS_PATTERN)
 
@@ -186,7 +186,7 @@ def get_vf_num_by_pci_address(pci_addr):
     A VF is associated with an VF number, which ip link command uses to
     configure it. This number can be obtained from the PCI device filesystem.
     """
-    VIRTFN_RE = re.compile("virtfn(\d+)")
+    VIRTFN_RE = re.compile(r"virtfn(\d+)")
     virtfns_path = "/sys/bus/pci/devices/%s/physfn/virtfn*" % (pci_addr)
     vf_num = None
     try:
diff --git a/nova/tests/fixtures.py b/nova/tests/fixtures.py
index 9689fc582977..4009fdd90a76 100644
--- a/nova/tests/fixtures.py
+++ b/nova/tests/fixtures.py
@@ -870,7 +870,7 @@ class WarningsFixture(fixtures.Fixture):
         # TODO(mriedem): Change (or remove) this DeprecationWarning once
         # https://bugs.launchpad.net/sqlalchemy-migrate/+bug/1814288 is fixed.
         warnings.filterwarnings(
-            'ignore', message='inspect\.getargspec\(\) is deprecated',
+            'ignore', message='inspect.getargspec() is deprecated',
             category=DeprecationWarning,
             module='migrate.versioning.script.py')
 
diff --git a/nova/tests/functional/api_sample_tests/test_aggregates.py b/nova/tests/functional/api_sample_tests/test_aggregates.py
index 99d1d629ab88..d5bb13abed93 100644
--- a/nova/tests/functional/api_sample_tests/test_aggregates.py
+++ b/nova/tests/functional/api_sample_tests/test_aggregates.py
@@ -28,7 +28,7 @@ class AggregatesSampleJsonTest(api_sample_base.ApiSampleTestBaseV21):
 
     def _test_aggregate_create(self):
         subs = {
-            "aggregate_id": '(?P<id>\d+)'
+            "aggregate_id": r'(?P<id>\d+)'
         }
         response = self._do_post('os-aggregates', 'aggregate-post-req', subs)
         return self._verify_response('aggregate-post-resp',
@@ -102,7 +102,7 @@ class AggregatesV2_41_SampleJsonTest(AggregatesSampleJsonTest):
 
     def _test_aggregate_create(self):
         subs = {
-            "aggregate_id": '(?P<id>\d+)',
+            "aggregate_id": r'(?P<id>\d+)',
         }
         response = self._do_post('os-aggregates', 'aggregate-post-req', subs)
         # This feels like cheating since we're getting the uuid from the
diff --git a/nova/tests/functional/api_sample_tests/test_remote_consoles.py b/nova/tests/functional/api_sample_tests/test_remote_consoles.py
index 65ae3f1f5d1d..09229265b0d3 100644
--- a/nova/tests/functional/api_sample_tests/test_remote_consoles.py
+++ b/nova/tests/functional/api_sample_tests/test_remote_consoles.py
@@ -34,7 +34,7 @@ class ConsolesSampleJsonTests(test_servers.ServersSampleBase):
                                  'get-vnc-console-post-req',
                                 {'action': 'os-getVNCConsole'})
         subs = {"url":
-                "((https?):((//)|(\\\\))+([\w\d:#@%/;$()~_?\+-=\\\.&](#!)?)*)"}
+            "((https?):((//)|(\\\\))+([\\w\\d:#@%/;$()~_?\\+-=\\\\.&](#!)?)*)"}
         self._verify_response('get-vnc-console-post-resp', subs, response, 200)
 
     def test_get_spice_console(self):
@@ -43,7 +43,7 @@ class ConsolesSampleJsonTests(test_servers.ServersSampleBase):
                                  'get-spice-console-post-req',
                                 {'action': 'os-getSPICEConsole'})
         subs = {"url":
-                "((https?):((//)|(\\\\))+([\w\d:#@%/;$()~_?\+-=\\\.&](#!)?)*)"}
+            "((https?):((//)|(\\\\))+([\\w\\d:#@%/;$()~_?\\+-=\\\\.&](#!)?)*)"}
         self._verify_response('get-spice-console-post-resp', subs,
                               response, 200)
 
@@ -53,7 +53,7 @@ class ConsolesSampleJsonTests(test_servers.ServersSampleBase):
                                  'get-rdp-console-post-req',
                                 {'action': 'os-getRDPConsole'})
         subs = {"url":
-                "((https?):((//)|(\\\\))+([\w\d:#@%/;$()~_?\+-=\\\.&](#!)?)*)"}
+            "((https?):((//)|(\\\\))+([\\w\\d:#@%/;$()~_?\\+-=\\\\.&](#!)?)*)"}
         self._verify_response('get-rdp-console-post-resp', subs,
                               response, 200)
 
@@ -63,7 +63,7 @@ class ConsolesSampleJsonTests(test_servers.ServersSampleBase):
                                  'get-serial-console-post-req',
                                 {'action': 'os-getSerialConsole'})
         subs = {"url":
-                "((https?):((//)|(\\\\))+([\w\d:#@%/;$()~_?\+-=\\\.&](#!)?)*)"}
+            "((https?):((//)|(\\\\))+([\\w\\d:#@%/;$()~_?\\+-=\\\\.&](#!)?)*)"}
         self._verify_response('get-serial-console-post-resp', subs,
                               response, 200)
 
@@ -78,7 +78,7 @@ class ConsolesV26SampleJsonTests(test_servers.ServersSampleBase):
 
     def setUp(self):
         super(ConsolesV26SampleJsonTests, self).setUp()
-        self.http_regex = "(https?://)([\w\d:#@%/;$()~_?\+-=\\\.&](#!)?)*"
+        self.http_regex = '(https?://)([\\w\\d:#@%/;$()~_?\\+-=\\\\.&](#!)?)*'
 
     def test_create_console(self):
         uuid = self._post_server()
@@ -97,7 +97,7 @@ class ConsolesV28SampleJsonTests(test_servers.ServersSampleBase):
 
     def setUp(self):
         super(ConsolesV28SampleJsonTests, self).setUp()
-        self.http_regex = "(https?://)([\w\d:#@%/;$()~_?\+-=\\\.&](#!)?)*"
+        self.http_regex = '(https?://)([\\w\\d:#@%/;$()~_?\\+-=\\\\.&](#!)?)*'
         self.flags(enabled=True, group='mks')
 
     def test_create_mks_console(self):
diff --git a/nova/tests/functional/api_sample_tests/test_rescue.py b/nova/tests/functional/api_sample_tests/test_rescue.py
index f5b21e9e7790..3c5545c297ff 100644
--- a/nova/tests/functional/api_sample_tests/test_rescue.py
+++ b/nova/tests/functional/api_sample_tests/test_rescue.py
@@ -45,7 +45,7 @@ class RescueJsonTest(test_servers.ServersSampleBase):
         subs['status'] = 'RESCUE'
         subs['access_ip_v4'] = '1.2.3.4'
         subs['access_ip_v6'] = '80fe::'
-        subs['instance_name'] = 'instance-\d{8}'
+        subs['instance_name'] = r'instance-\d{8}'
         subs['hypervisor_hostname'] = r'[\w\.\-]+'
         subs['cdrive'] = '.*'
         self._verify_response('server-get-resp-rescue', subs, response, 200)
@@ -69,7 +69,7 @@ class RescueJsonTest(test_servers.ServersSampleBase):
         subs['status'] = 'RESCUE'
         subs['access_ip_v4'] = '1.2.3.4'
         subs['access_ip_v6'] = '80fe::'
-        subs['instance_name'] = 'instance-\d{8}'
+        subs['instance_name'] = r'instance-\d{8}'
         subs['hypervisor_hostname'] = r'[\w\.\-]+'
         subs['cdrive'] = '.*'
         self._verify_response('server-get-resp-rescue', subs, response, 200)
@@ -88,7 +88,7 @@ class RescueJsonTest(test_servers.ServersSampleBase):
         subs['status'] = 'ACTIVE'
         subs['access_ip_v4'] = '1.2.3.4'
         subs['access_ip_v6'] = '80fe::'
-        subs['instance_name'] = 'instance-\d{8}'
+        subs['instance_name'] = r'instance-\d{8}'
         subs['hypervisor_hostname'] = r'[\w\.\-]+'
         subs['cdrive'] = '.*'
         self._verify_response('server-get-resp-unrescue', subs, response, 200)
diff --git a/nova/tests/functional/api_sample_tests/test_server_tags.py b/nova/tests/functional/api_sample_tests/test_server_tags.py
index a82f1e44f4be..14917661ece3 100644
--- a/nova/tests/functional/api_sample_tests/test_server_tags.py
+++ b/nova/tests/functional/api_sample_tests/test_server_tags.py
@@ -36,7 +36,7 @@ class ServerTagsJsonTest(test_servers.ServersSampleBase):
         subs['access_ip_v4'] = '1.2.3.4'
         subs['access_ip_v6'] = '80fe::'
         subs['hostname'] = r'[\w\.\-]+'
-        subs['instance_name'] = 'instance-\d{8}'
+        subs['instance_name'] = r'instance-\d{8}'
         subs['hypervisor_hostname'] = r'[\w\.\-]+'
         subs['cdrive'] = '.*'
         subs['user_data'] = (self.user_data if six.PY2
diff --git a/nova/tests/functional/api_sample_tests/test_servers.py b/nova/tests/functional/api_sample_tests/test_servers.py
index dbfe96d1b36d..2467300b92c2 100644
--- a/nova/tests/functional/api_sample_tests/test_servers.py
+++ b/nova/tests/functional/api_sample_tests/test_servers.py
@@ -118,7 +118,7 @@ class ServersSampleJsonTest(ServersSampleBase):
         subs = {}
         subs['hostid'] = '[a-f0-9]+'
         subs['id'] = uuid
-        subs['instance_name'] = 'instance-\d{8}'
+        subs['instance_name'] = r'instance-\d{8}'
         subs['hypervisor_hostname'] = r'[\w\.\-]+'
         subs['hostname'] = r'[\w\.\-]+'
         subs['mac_addr'] = '(?:[a-f0-9]{2}:){5}[a-f0-9]{2}'
@@ -145,7 +145,7 @@ class ServersSampleJsonTest(ServersSampleBase):
         subs = {}
         subs['hostid'] = '[a-f0-9]+'
         subs['id'] = uuid
-        subs['instance_name'] = 'instance-\d{8}'
+        subs['instance_name'] = r'instance-\d{8}'
         subs['hypervisor_hostname'] = r'[\w\.\-]+'
         subs['hostname'] = r'[\w\.\-]+'
         subs['mac_addr'] = '(?:[a-f0-9]{2}:){5}[a-f0-9]{2}'
@@ -261,7 +261,7 @@ class ServersSampleJson263Test(ServersSampleBase):
         super(ServersSampleJson263Test, self).setUp()
         self.common_subs = {
             'hostid': '[a-f0-9]+',
-            'instance_name': 'instance-\d{8}',
+            'instance_name': r'instance-\d{8}',
             'hypervisor_hostname': r'[\w\.\-]+',
             'hostname': r'[\w\.\-]+',
             'access_ip_v4': '1.2.3.4',
@@ -330,7 +330,7 @@ class ServersSampleJson266Test(ServersSampleBase):
         super(ServersSampleJson266Test, self).setUp()
         self.common_subs = {
             'hostid': '[a-f0-9]+',
-            'instance_name': 'instance-\d{8}',
+            'instance_name': r'instance-\d{8}',
             'hypervisor_hostname': r'[\w\.\-]+',
             'hostname': r'[\w\.\-]+',
             'access_ip_v4': '1.2.3.4',
@@ -430,7 +430,7 @@ class ServersSampleJson271Test(ServersSampleBase):
         super(ServersSampleJson271Test, self).setUp()
         self.common_subs = {
             'hostid': '[a-f0-9]+',
-            'instance_name': 'instance-\d{8}',
+            'instance_name': r'instance-\d{8}',
             'hypervisor_hostname': r'[\w\.\-]+',
             'hostname': r'[\w\.\-]+',
             'access_ip_v4': '1.2.3.4',
diff --git a/nova/tests/functional/api_samples_test_base.py b/nova/tests/functional/api_samples_test_base.py
index 581c7327ebfe..d9bd8a215ceb 100644
--- a/nova/tests/functional/api_samples_test_base.py
+++ b/nova/tests/functional/api_samples_test_base.py
@@ -337,7 +337,7 @@ class ApiSampleTestBase(integrated_helpers._IntegratedTestBase):
 
         project_id_exp = '(%s|%s)' % (PROJECT_ID, self.project_id)
 
-        url_re = self._get_host() + "/v(2|2\.1)/" + project_id_exp
+        url_re = self._get_host() + r"/v(2|2\.1)/" + project_id_exp
         new_url = self._get_host() + "/" + self.api_major_version
         if self._use_project_id:
             new_url += "/" + self.project_id
@@ -431,13 +431,13 @@ class ApiSampleTestBase(integrated_helpers._IntegratedTestBase):
 
     def _get_regexes(self):
         text = r'(\\"|[^"])*'
-        isotime_re = '\d{4}-[0,1]\d-[0-3]\dT\d{2}:\d{2}:\d{2}Z'
-        strtime_re = '\d{4}-[0,1]\d-[0-3]\dT\d{2}:\d{2}:\d{2}\.\d{6}'
-        strtime_url_re = ('\d{4}-[0,1]\d-[0-3]\d'
-                          '\+\d{2}\%3A\d{2}\%3A\d{2}\.\d{6}')
-        xmltime_re = ('\d{4}-[0,1]\d-[0-3]\d '
-                      '\d{2}:\d{2}:\d{2}'
-                      '(\.\d{6})?(\+00:00)?')
+        isotime_re = r'\d{4}-[0,1]\d-[0-3]\dT\d{2}:\d{2}:\d{2}Z'
+        strtime_re = r'\d{4}-[0,1]\d-[0-3]\dT\d{2}:\d{2}:\d{2}\.\d{6}'
+        strtime_url_re = (r'\d{4}-[0,1]\d-[0-3]\d'
+                          r'\+\d{2}\%3A\d{2}\%3A\d{2}\.\d{6}')
+        xmltime_re = (r'\d{4}-[0,1]\d-[0-3]\d '
+                      r'\d{2}:\d{2}:\d{2}'
+                      r'(\.\d{6})?(\+00:00)?')
 
         # NOTE(claudiub): the x509 keypairs are different from the
         # ssh keypairs. For example, the x509 fingerprint has 40 bytes.
diff --git a/nova/tests/functional/test_nova_manage.py b/nova/tests/functional/test_nova_manage.py
index 28fa78baab21..0fa541b51499 100644
--- a/nova/tests/functional/test_nova_manage.py
+++ b/nova/tests/functional/test_nova_manage.py
@@ -869,7 +869,7 @@ class TestDBArchiveDeletedRows(integrated_helpers._IntegratedTestBase):
         self.cli.archive_deleted_rows(verbose=True)
         # Assert only one instance_group_member record was deleted.
         self.assertRegex(self.output.getvalue(),
-                         ".*instance_group_member.*\| 1.*")
+                         r".*instance_group_member.*\| 1.*")
         # And that we still have one remaining group member.
         self.assertEqual(
             1, len(self.api.get_server_group(group['id'])['members']))
diff --git a/nova/tests/functional/test_report_client.py b/nova/tests/functional/test_report_client.py
index 03467242a828..58ddad6a30bb 100644
--- a/nova/tests/functional/test_report_client.py
+++ b/nova/tests/functional/test_report_client.py
@@ -325,7 +325,7 @@ class SchedulerReportClientTests(SchedulerReportClientTestBase):
                             global_request_id=global_request_id)
 
     def test_get_provider_tree_with_nested_and_aggregates(self):
-        """A more in-depth test of get_provider_tree_and_ensure_root with
+        r"""A more in-depth test of get_provider_tree_and_ensure_root with
         nested and sharing resource providers.
 
                ss1(DISK)    ss2(DISK)           ss3(DISK)
@@ -1013,7 +1013,7 @@ class SchedulerReportClientTests(SchedulerReportClientTestBase):
                 self.context, utils.ResourceRequest())
 
     def _set_up_provider_tree(self):
-        """Create two compute nodes in placement ("this" one, and another one)
+        r"""Create two compute nodes in placement ("this" one, and another one)
         and a storage provider sharing with both.
 
              +-----------------------+      +------------------------+
diff --git a/nova/tests/functional/test_servers_provider_tree.py b/nova/tests/functional/test_servers_provider_tree.py
index 217e456297ef..e499b5d65408 100644
--- a/nova/tests/functional/test_servers_provider_tree.py
+++ b/nova/tests/functional/test_servers_provider_tree.py
@@ -156,7 +156,7 @@ class ProviderTreeTests(integrated_helpers.ProviderUsageBaseTestCase):
 
     def _update_provider_tree_multiple_providers(self, startup=False,
                                                  do_reshape=False):
-        """Make update_provider_tree create multiple providers, including an
+        r"""Make update_provider_tree create multiple providers, including an
         additional root as a sharing provider; and some descendants in the
         compute node's tree.
 
diff --git a/nova/tests/unit/api/openstack/compute/test_serversV21.py b/nova/tests/unit/api/openstack/compute/test_serversV21.py
index 07140d382b82..62e22ffd5584 100644
--- a/nova/tests/unit/api/openstack/compute/test_serversV21.py
+++ b/nova/tests/unit/api/openstack/compute/test_serversV21.py
@@ -1509,13 +1509,13 @@ class ServersControllerTest(ControllerTest):
                          cell_down_support=False, all_tenants=False):
             self.assertIsNotNone(search_opts)
             self.assertIn('ip', search_opts)
-            self.assertEqual(search_opts['ip'], '10\..*')
+            self.assertEqual(search_opts['ip'], r'10\..*')
             return objects.InstanceList(
                 objects=[fakes.stub_instance_obj(100, uuid=uuids.fake)])
 
         self.mock_get_all.side_effect = fake_get_all
 
-        req = self.req('/fake/servers?ip=10\..*')
+        req = self.req(r'/fake/servers?ip=10\..*')
         servers = self.controller.index(req)['servers']
 
         self.assertEqual(1, len(servers))
diff --git a/nova/tests/unit/compute/test_compute.py b/nova/tests/unit/compute/test_compute.py
index bee2eda5b67a..cd3fa88a762c 100644
--- a/nova/tests/unit/compute/test_compute.py
+++ b/nova/tests/unit/compute/test_compute.py
@@ -9472,7 +9472,7 @@ class ComputeAPITestCase(BaseTestCase):
         # ip ends up matching 2nd octet here.. so all 3 match ip
         # but 'name' only matches one
         instances = self.compute_api.get_all(c,
-                search_opts={'ip': '.*\.1', 'name': 'not.*'})
+                search_opts={'ip': r'.*\.1', 'name': 'not.*'})
         self.assertEqual(len(instances), 1)
         self.assertEqual(instances[0]['uuid'], instance3['uuid'])
 
@@ -9480,19 +9480,19 @@ class ComputeAPITestCase(BaseTestCase):
         # so instance 1 and 3.. but name should only match #1
         # but 'name' only matches one
         instances = self.compute_api.get_all(c,
-                search_opts={'ip': '.*\.1$', 'name': '^woo.*'})
+                search_opts={'ip': r'.*\.1$', 'name': '^woo.*'})
         self.assertEqual(len(instances), 1)
         self.assertEqual(instances[0]['uuid'], instance1['uuid'])
 
         # same as above but no match on name (name matches instance1
         # but the ip query doesn't
         instances = self.compute_api.get_all(c,
-                search_opts={'ip': '.*\.2$', 'name': '^woot.*'})
+                search_opts={'ip': r'.*\.2$', 'name': '^woot.*'})
         self.assertEqual(len(instances), 0)
 
         # ip matches all 3... ipv6 matches #2+#3...name matches #3
         instances = self.compute_api.get_all(c,
-                search_opts={'ip': '.*\.1',
+                search_opts={'ip': r'.*\.1',
                              'name': 'not.*',
                              'ip6': '^.*12.*34.*'})
         self.assertEqual(len(instances), 1)
diff --git a/nova/tests/unit/conf_fixture.py b/nova/tests/unit/conf_fixture.py
index 6e4f5a8ee2fa..3a6c6b3b6613 100644
--- a/nova/tests/unit/conf_fixture.py
+++ b/nova/tests/unit/conf_fixture.py
@@ -46,7 +46,7 @@ class ConfFixture(config_fixture.Config):
         # We should fix the tests to use real
         # UUIDs then drop this work around.
         self.conf.set_default('project_id_regex',
-                              '[0-9a-fk\-]+', 'osapi_v21')
+                              '[0-9a-fk-]+', 'osapi_v21')
         self.conf.set_default('use_ipv6', True)
         self.conf.set_default('vlan_interface', 'eth0')
 
diff --git a/nova/tests/unit/objects/test_numa.py b/nova/tests/unit/objects/test_numa.py
index db49106b3688..5db03a87d73e 100644
--- a/nova/tests/unit/objects/test_numa.py
+++ b/nova/tests/unit/objects/test_numa.py
@@ -60,9 +60,8 @@ class _TestNUMA(object):
         numacell.pin_cpus(set([2, 3]))
         self.assertEqual(set([4]), numacell.free_cpus)
 
-        expect_msg = (
-            exception.CPUPinningUnknown.msg_fmt % {'requested': "\[1, 55\]",
-                                                   'cpuset': "\[1, 2, 3, 4\]"})
+        expect_msg = exception.CPUPinningUnknown.msg_fmt % {
+            'requested': r'\[1, 55\]', 'cpuset': r'\[1, 2, 3, 4\]'}
         with testtools.ExpectedException(exception.CPUPinningUnknown,
                                          expect_msg):
             numacell.pin_cpus(set([1, 55]))
@@ -70,8 +69,8 @@ class _TestNUMA(object):
         self.assertRaises(exception.CPUPinningInvalid,
                           numacell.pin_cpus, set([1, 4]))
 
-        expect_msg = (exception.CPUUnpinningUnknown.msg_fmt %
-                      {'requested': "\[1, 55\]", 'cpuset': "\[1, 2, 3, 4\]"})
+        expect_msg = exception.CPUUnpinningUnknown.msg_fmt % {
+            'requested': r'\[1, 55\]', 'cpuset': r'\[1, 2, 3, 4\]'}
         with testtools.ExpectedException(exception.CPUUnpinningUnknown,
                                          expect_msg):
             numacell.unpin_cpus(set([1, 55]))
diff --git a/nova/tests/unit/test_iptables_network.py b/nova/tests/unit/test_iptables_network.py
index f8f1144b8c4a..45b0052a5923 100644
--- a/nova/tests/unit/test_iptables_network.py
+++ b/nova/tests/unit/test_iptables_network.py
@@ -143,7 +143,7 @@ class IptablesManagerTestCase(test.NoDBTestCase):
         table.add_rule('OUTPUT', '-d 10.10.10.11 -j DNAT --to 10.0.0.10')
         new_lines = self.manager._modify_rules(current_lines, table, 'nat')
         self.assertEqual(len(new_lines) - len(current_lines), 8)
-        regex = '.*\s+%s(/32|\s+|$)'
+        regex = r'.*\s+%s(/32|\s+|$)'
         num_removed = table.remove_rules_regex(regex % '10.10.10.10')
         self.assertEqual(num_removed, 4)
         new_lines = self.manager._modify_rules(current_lines, table, 'nat')
diff --git a/nova/tests/unit/virt/libvirt/storage/test_rbd.py b/nova/tests/unit/virt/libvirt/storage/test_rbd.py
index f6629b79f183..5464f1ba7b2c 100644
--- a/nova/tests/unit/virt/libvirt/storage/test_rbd.py
+++ b/nova/tests/unit/virt/libvirt/storage/test_rbd.py
@@ -23,7 +23,7 @@ from nova.virt.libvirt.storage import rbd_utils
 from nova.virt.libvirt import utils as libvirt_utils
 
 
-CEPH_MON_DUMP = """dumped monmap epoch 1
+CEPH_MON_DUMP = r"""dumped monmap epoch 1
 { "epoch": 1,
   "fsid": "33630410-6d93-4d66-8e42-3b953cf194aa",
   "modified": "2013-05-22 17:44:56.343618",
diff --git a/nova/tests/unit/virt/libvirt/test_driver.py b/nova/tests/unit/virt/libvirt/test_driver.py
index 146d9194cffe..794a8a9c4f77 100644
--- a/nova/tests/unit/virt/libvirt/test_driver.py
+++ b/nova/tests/unit/virt/libvirt/test_driver.py
@@ -13171,8 +13171,8 @@ class LibvirtConnTestCase(test.NoDBTestCase,
                 return None
 
         def fake_node_device_lookup_by_name(address):
-            pattern = ("pci_%(hex)s{4}_%(hex)s{2}_%(hex)s{2}_%(oct)s{1}"
-                       % dict(hex='[\da-f]', oct='[0-8]'))
+            pattern = "pci_%(hex)s{4}_%(hex)s{2}_%(hex)s{2}_%(oct)s{1}" % {
+                'hex': r'[\da-f]', 'oct': '[0-8]'}
             pattern = re.compile(pattern)
             if pattern.match(address) is None:
                 raise fakelibvirt.libvirtError()
@@ -15801,8 +15801,8 @@ class LibvirtConnTestCase(test.NoDBTestCase,
             self.assertRaisesRegex(
                 exception.InvalidNetworkNUMAAffinity,
                 "Invalid NUMA network affinity configured: the physnet 'bar' "
-                "was listed in '\[neutron\] physnets' but no corresponding "
-                "'\[neutron_physnet_bar\] numa_nodes' option was defined.",
+                "was listed in '\\[neutron\\] physnets' but no corresponding "
+                "'\\[neutron_physnet_bar\\] numa_nodes' option was defined.",
                 drvr._get_host_numa_topology)
 
     @mock.patch.object(host.Host, 'has_min_version', return_value=True)
diff --git a/nova/tests/unit/virt/libvirt/test_firewall.py b/nova/tests/unit/virt/libvirt/test_firewall.py
index 317e3695f1d1..07f458302c76 100644
--- a/nova/tests/unit/virt/libvirt/test_firewall.py
+++ b/nova/tests/unit/virt/libvirt/test_firewall.py
@@ -280,13 +280,13 @@ class IptablesFirewallTestCase(test.NoDBTestCase):
         self.assertTrue(security_group_chain,
                         "The security group chain wasn't added")
 
-        regex = re.compile('\[0\:0\] -A .* -j ACCEPT -p icmp '
+        regex = re.compile(r'\[0\:0\] -A .* -j ACCEPT -p icmp '
                            '-s 192.168.11.0/24')
         match_rules = [rule for rule in self.out_rules if regex.match(rule)]
         self.assertGreater(len(match_rules), 0,
                            "ICMP acceptance rule wasn't added")
 
-        regex = re.compile('\[0\:0\] -A .* -j ACCEPT -p icmp -m icmp '
+        regex = re.compile(r'\[0\:0\] -A .* -j ACCEPT -p icmp -m icmp '
                            '--icmp-type 8 -s 192.168.11.0/24')
         match_rules = [rule for rule in self.out_rules if regex.match(rule)]
         self.assertGreater(len(match_rules), 0,
@@ -295,13 +295,13 @@ class IptablesFirewallTestCase(test.NoDBTestCase):
         for ip in network_model.fixed_ips():
             if ip['version'] != 4:
                 continue
-            regex = re.compile('\[0\:0\] -A .* -j ACCEPT -p tcp -m multiport '
+            regex = re.compile(r'\[0\:0\] -A .* -j ACCEPT -p tcp -m multiport '
                                '--dports 80:81 -s %s' % ip['address'])
             match_rules = [rule for rule in self.out_rules
                            if regex.match(rule)]
             self.assertGreater(len(match_rules), 0,
                                "TCP port 80/81 acceptance rule wasn't added")
-            regex = re.compile('\[0\:0\] -A .* -j ACCEPT -s '
+            regex = re.compile(r'\[0\:0\] -A .* -j ACCEPT -s '
                                '%s' % ip['address'])
             match_rules = [rule for rule in self.out_rules
                            if regex.match(rule)]
@@ -309,7 +309,7 @@ class IptablesFirewallTestCase(test.NoDBTestCase):
                                "Protocol/port-less acceptance rule"
                                " wasn't added")
 
-        regex = re.compile('\[0\:0\] -A .* -j ACCEPT -p tcp '
+        regex = re.compile(r'\[0\:0\] -A .* -j ACCEPT -p tcp '
                            '-m multiport --dports 80:81 -s 192.168.10.0/24')
         match_rules = [rule for rule in self.out_rules if regex.match(rule)]
         self.assertGreater(len(match_rules), 0,
diff --git a/nova/tests/unit/virt/libvirt/volume/test_vzstorage.py b/nova/tests/unit/virt/libvirt/volume/test_vzstorage.py
index 822ba08d6bd6..883cebb55a14 100644
--- a/nova/tests/unit/virt/libvirt/volume/test_vzstorage.py
+++ b/nova/tests/unit/virt/libvirt/volume/test_vzstorage.py
@@ -58,8 +58,9 @@ class LibvirtVZStorageTestCase(test_volume.LibvirtVolumeBaseTestCase):
         connection_info = {'data': {'export': wrong_export_string,
                                     'name': self.name}}
 
-        err_pattern = ("^Valid share format is "
-                    "\[mds\[,mds1\[\.\.\.\]\]:/\]clustername\[:password\]$")
+        err_pattern = (
+            "^Valid share format is "
+            r"\[mds\[,mds1\[\.\.\.\]\]:/\]clustername\[:password\]$")
         self.assertRaisesRegex(exception.InvalidVolume,
                                 err_pattern,
                                 drv.connect_volume,
diff --git a/nova/tests/unit/virt/test_hardware.py b/nova/tests/unit/virt/test_hardware.py
index d5f11b5153aa..38ee3fb10350 100644
--- a/nova/tests/unit/virt/test_hardware.py
+++ b/nova/tests/unit/virt/test_hardware.py
@@ -1734,9 +1734,9 @@ class NUMATopologyTest(test.NoDBTestCase):
         self.assertEqual(hostusage.cells[1].memory_usage, 128)
 
     def test_topo_usage_with_network_metadata(self):
-        """Validate behavior with network_metadata.
+        r"""Validate behavior with network_metadata.
 
-        Ensure we handle ``NUMACell``\s that have ``network_metadata`` set
+        Ensure we handle ``NUMACell``\ s that have ``network_metadata`` set
         along with those where this is unset.
         """
 
diff --git a/nova/tests/unit/virt/vmwareapi/test_ds_util.py b/nova/tests/unit/virt/vmwareapi/test_ds_util.py
index 1d502e64d551..ce10dc430fbf 100644
--- a/nova/tests/unit/virt/vmwareapi/test_ds_util.py
+++ b/nova/tests/unit/virt/vmwareapi/test_ds_util.py
@@ -311,7 +311,7 @@ class DsUtilTestCase(test.NoDBTestCase):
 
     def test_get_datastore_with_regex(self):
         # Test with a regex that matches with a datastore
-        datastore_valid_regex = re.compile("^openstack.*\d$")
+        datastore_valid_regex = re.compile(r"^openstack.*\d$")
         fake_objects = fake.FakeRetrieveResult()
         fake_objects.add_object(fake.Datastore("openstack-ds0"))
         fake_objects.add_object(fake.Datastore("fake-ds0"))
@@ -323,7 +323,7 @@ class DsUtilTestCase(test.NoDBTestCase):
         self.assertEqual("openstack-ds0", result.name)
 
     def test_get_datastore_with_token(self):
-        regex = re.compile("^ds.*\d$")
+        regex = re.compile(r"^ds.*\d$")
         fake0 = fake.FakeRetrieveResult()
         fake0.add_object(fake.Datastore("ds0", 10 * units.Gi, 5 * units.Gi))
         fake0.add_object(fake.Datastore("foo", 10 * units.Gi, 9 * units.Gi))
diff --git a/nova/tests/unit/virt/xenapi/test_xenapi.py b/nova/tests/unit/virt/xenapi/test_xenapi.py
index 4c4db2ebe341..f699dddcf0fd 100644
--- a/nova/tests/unit/virt/xenapi/test_xenapi.py
+++ b/nova/tests/unit/virt/xenapi/test_xenapi.py
@@ -2935,19 +2935,19 @@ class XenAPIDom0IptablesFirewallTestCase(stubs.XenAPITestBase):
         self.assertTrue(security_group_chain,
                         "The security group chain wasn't added")
 
-        regex = re.compile('\[0\:0\] -A .* -j ACCEPT -p icmp'
+        regex = re.compile(r'\[0\:0\] -A .* -j ACCEPT -p icmp'
                            ' -s 192.168.11.0/24')
         match_rules = [rule for rule in self._out_rules if regex.match(rule)]
         self.assertGreater(len(match_rules), 0,
                            "ICMP acceptance rule wasn't added")
 
-        regex = re.compile('\[0\:0\] -A .* -j ACCEPT -p icmp -m icmp'
+        regex = re.compile(r'\[0\:0\] -A .* -j ACCEPT -p icmp -m icmp'
                            ' --icmp-type 8 -s 192.168.11.0/24')
         match_rules = [rule for rule in self._out_rules if regex.match(rule)]
         self.assertGreater(len(match_rules), 0,
                            "ICMP Echo Request acceptance rule wasn't added")
 
-        regex = re.compile('\[0\:0\] -A .* -j ACCEPT -p tcp --dport 80:81'
+        regex = re.compile(r'\[0\:0\] -A .* -j ACCEPT -p tcp --dport 80:81'
                            ' -s 192.168.10.0/24')
         match_rules = [rule for rule in self._out_rules if regex.match(rule)]
         self.assertGreater(len(match_rules), 0,
@@ -2991,7 +2991,7 @@ class XenAPIDom0IptablesFirewallTestCase(stubs.XenAPITestBase):
         for ip in network_model.fixed_ips():
             if ip['version'] != 4:
                 continue
-            regex = re.compile('\[0\:0\] -A .* -j ACCEPT -p tcp'
+            regex = re.compile(r'\[0\:0\] -A .* -j ACCEPT -p tcp'
                                ' --dport 80:81 -s %s' % ip['address'])
             match_rules = [rule for rule in self._out_rules
                            if regex.match(rule)]
@@ -3063,7 +3063,7 @@ class XenAPIDom0IptablesFirewallTestCase(stubs.XenAPITestBase):
                                        'cidr': '192.168.99.0/24'})
         # validate the extra rule
         self.fw.refresh_security_group_rules(secgroup)
-        regex = re.compile('\[0\:0\] -A .* -j ACCEPT -p udp --dport 200:299'
+        regex = re.compile(r'\[0\:0\] -A .* -j ACCEPT -p udp --dport 200:299'
                            ' -s 192.168.99.0/24')
         match_rules = [rule for rule in self._out_rules if regex.match(rule)]
         self.assertGreater(len(match_rules), 0,
diff --git a/nova/utils.py b/nova/utils.py
index 7f453cfca837..71d50f2d4b9c 100644
--- a/nova/utils.py
+++ b/nova/utils.py
@@ -515,7 +515,7 @@ def sanitize_hostname(hostname, default_name=None):
 
     hostname = truncate_hostname(hostname)
     hostname = re.sub('[ _]', '-', hostname)
-    hostname = re.sub('[^\w.-]+', '', hostname)
+    hostname = re.sub(r'[^\w.-]+', '', hostname)
     hostname = hostname.lower()
     hostname = hostname.strip('.-')
     # NOTE(eliqiao): set hostname to default_display_name to avoid
diff --git a/nova/virt/vmwareapi/driver.py b/nova/virt/vmwareapi/driver.py
index 2720e832bcee..77c8f07df1c5 100644
--- a/nova/virt/vmwareapi/driver.py
+++ b/nova/virt/vmwareapi/driver.py
@@ -88,7 +88,7 @@ class VMwareVCDriver(driver.ComputeDriver):
     # We assume <mo id> consists of alphanumeric, _ and -.
     # We assume cluster name is everything between the first ( and the last ).
     # We pull out <mo id> for re-use.
-    LEGACY_NODENAME = re.compile('([\w-]+)\(.+\)')
+    LEGACY_NODENAME = re.compile(r'([\w-]+)\(.+\)')
 
     # The vCenter driver includes API that acts on ESX hosts or groups
     # of ESX hosts in clusters or non-cluster logical-groupings.
diff --git a/nova/virt/vmwareapi/network_util.py b/nova/virt/vmwareapi/network_util.py
index c3169a8b5e47..f62ecd405f81 100644
--- a/nova/virt/vmwareapi/network_util.py
+++ b/nova/virt/vmwareapi/network_util.py
@@ -35,7 +35,7 @@ LOG = logging.getLogger(__name__)
 # Examples:
 # - vxw-dvs-22-virtualwire-89-sid-5008-NAME
 # - vxw-dvs-22-virtualwire-89-sid-5008-UUID
-VWIRE_REGEX = re.compile('vxw-dvs-(\d+)-virtualwire-(\d+)-sid-(\d+)-(.*)')
+VWIRE_REGEX = re.compile(r'vxw-dvs-(\d+)-virtualwire-(\d+)-sid-(\d+)-(.*)')
 
 
 def _get_name_from_dvs_name(dvs_name):
diff --git a/nova/virt/xenapi/host.py b/nova/virt/xenapi/host.py
index a191e2f95b7b..cf140a5fe6dd 100644
--- a/nova/virt/xenapi/host.py
+++ b/nova/virt/xenapi/host.py
@@ -161,7 +161,7 @@ class HostState(object):
         :returns: a list of pci devices on the node
         """
         def _compile_hex(pattern):
-            """Return a compiled regular expression pattern into which we have
+            r"""Return a compiled regular expression pattern into which we have
             replaced occurrences of hex by [\da-fA-F].
             """
             return re.compile(pattern.replace("hex", r"[\da-fA-F]"))
diff --git a/tox.ini b/tox.ini
index 22aa1760531c..657eaf0dde36 100644
--- a/tox.ini
+++ b/tox.ini
@@ -237,10 +237,10 @@ commands = bandit -r nova -x tests -n 5 -ll
 #
 # W504 skipped since you must choose either W503 or W504 (they conflict)
 #
-# W605 and E731 temporarily skipped because of the number of
+# E731 temporarily skipped because of the number of
 # these that have to be fixed
 enable-extensions = H106,H203,H904
-ignore = E121,E122,E123,E124,E125,E126,E127,E128,E129,E131,E251,H405,W504,W605,E731
+ignore = E121,E122,E123,E124,E125,E126,E127,E128,E129,E131,E251,H405,W504,E731
 exclude =  .venv,.git,.tox,dist,*lib/python*,*egg,build,tools/xenserver*,releasenotes
 # To get a list of functions that are more complex than 25, set max-complexity
 # to 25 and run 'tox -epep8'.