Remove library "six"

Now Python2 is not supported, this compatibility library for both
versions is not needed anymore.

Change-Id: Ic6da328a6219c8a00d38602f6b539a2ff5be1b2e

doc/source/contributor/api_converters.rst

@@ -43,7 +43,7 @@ to a boolean value.
 ::
 
    def convert_to_boolean(data):
-        if isinstance(data, six.string_types):
+        if isinstance(data, str):
             val = data.lower()
             if val == "true" or val == "1":
                 return True

lower-constraints.txt

@@ -80,7 +80,6 @@ requestsexceptions==1.2.0
 rfc3986==0.3.1
 Routes==2.3.1
 setproctitle==1.1.10
-six==1.10.0
 snowballstemmer==1.2.1
 Sphinx==1.6.2
 sphinxcontrib-websupport==1.0.1

neutron_lib/__init__.py

@@ -13,16 +13,11 @@
 import gettext
 
 import pbr.version
-import six
 
 from neutron_lib.db import api  # noqa
 
 
-if six.PY2:
-    # pylint: disable=unexpected-keyword-arg
-    gettext.install('neutron_lib', unicode=1)
-else:
-    gettext.install('neutron_lib')
+gettext.install('neutron_lib')
 
 
 # NOTE(boden): neutron_lib.db.api is imported to ensure the ORM event listeners

neutron_lib/agent/extension.py

@@ -12,11 +12,8 @@
 
 import abc
 
-import six
 
-
-@six.add_metaclass(abc.ABCMeta)
-class AgentExtension(object):
+class AgentExtension(object, metaclass=abc.ABCMeta):
     """Define stable abstract interface for agent extensions.
 
     An agent extension extends the agent core functionality.

neutron_lib/agent/l2_extension.py

@@ -12,13 +12,10 @@
 
 import abc
 
-import six
-
 from neutron_lib.agent import extension
 
 
-@six.add_metaclass(abc.ABCMeta)
-class L2AgentExtension(extension.AgentExtension):
+class L2AgentExtension(extension.AgentExtension, metaclass=abc.ABCMeta):
     """Define stable abstract interface for l2 agent extensions.
 
     An agent extension extends the agent core functionality.

neutron_lib/agent/l3_extension.py

@@ -12,13 +12,10 @@
 
 import abc
 
-import six
-
 from neutron_lib.agent import extension
 
 
-@six.add_metaclass(abc.ABCMeta)
-class L3AgentExtension(extension.AgentExtension):
+class L3AgentExtension(extension.AgentExtension, metaclass=abc.ABCMeta):
     """Define stable abstract interface for l3 agent extensions.
 
     An agent extension extends the agent core functionality.

neutron_lib/api/converters.py

@@ -13,7 +13,6 @@
 import netaddr
 from oslo_config import cfg
 from oslo_utils import strutils
-import six
 
 from neutron_lib._i18n import _
 from neutron_lib.api import validators
@@ -172,7 +171,7 @@ def convert_to_list(data):
     """
     if data is None:
         return []
-    elif hasattr(data, '__iter__') and not isinstance(data, six.string_types):
+    elif hasattr(data, '__iter__') and not isinstance(data, str):
         return list(data)
     else:
         return [data]
@@ -191,7 +190,7 @@ def convert_ip_to_canonical_format(value):
     try:
         ip = netaddr.IPAddress(value)
         if ip.version == constants.IP_VERSION_6:
-            return six.text_type(ip.format(dialect=netaddr.ipv6_compact))
+            return str(ip.format(dialect=netaddr.ipv6_compact))
     except (netaddr.core.AddrFormatError, ValueError):
         pass
     return value
@@ -292,7 +291,7 @@ def convert_prefix_forced_case(data, prefix):
               replaced by <prefix>
     """
     plen = len(prefix)
-    if (isinstance(data, six.string_types) and len(data) >= plen and
+    if (isinstance(data, str) and len(data) >= plen and
             data[0:plen].lower() == prefix.lower()):
         return prefix + data[plen:]
     return data

neutron_lib/api/extensions.py

@@ -15,8 +15,6 @@
 
 import abc
 
-import six
-
 from neutron_lib._i18n import _
 from neutron_lib import constants
 
@@ -34,8 +32,7 @@ def is_extension_supported(plugin, alias):
     return alias in getattr(plugin, "supported_extension_aliases", [])
 
 
-@six.add_metaclass(abc.ABCMeta)
-class ExtensionDescriptor(object):
+class ExtensionDescriptor(object, metaclass=abc.ABCMeta):
     """Base class that defines the contract for extensions."""
 
     @abc.abstractmethod

neutron_lib/api/validators/__init__.py

@@ -22,7 +22,6 @@ from oslo_log import log as logging
 from oslo_utils import netutils
 from oslo_utils import strutils
 from oslo_utils import uuidutils
-import six
 from webob import exc
 
 from neutron_lib._i18n import _
@@ -228,7 +227,7 @@ def validate_string(data, max_len=None):
         the given max_len. Otherwise a human readable message indicating why
         the data is invalid.
     """
-    if not isinstance(data, six.string_types):
+    if not isinstance(data, str):
         msg = _("'%s' is not a valid string") % data
         LOG.debug(msg)
         return msg
@@ -1117,7 +1116,7 @@ def validate_subnet_service_types(service_types, valid_values=None):
         prefixes += constants.DEVICE_OWNER_COMPUTE_PREFIX
 
         for service_type in service_types:
-            if not isinstance(service_type, six.text_type):
+            if not isinstance(service_type, str):
                 raise n_exc.InvalidInputSubnetServiceType(
                     service_type=service_type)
             elif not service_type.startswith(tuple(prefixes)):
@@ -1148,9 +1147,9 @@ def validate_ethertype(ethertype, valid_values=None):
             # Value of ethertype cannot be coerced into a string, like None
             pass
         try:
-            if isinstance(ethertype, six.string_types):
+            if isinstance(ethertype, str):
                 ethertype = int(ethertype, 16)
-            if (isinstance(ethertype, six.integer_types) and
+            if (isinstance(ethertype, int) and
                     constants.ETHERTYPE_MIN <= ethertype and
                     ethertype <= constants.ETHERTYPE_MAX):
                 return None

neutron_lib/db/api.py

@@ -12,6 +12,7 @@
 
 import contextlib
 import copy
+import functools
 import weakref
 
 from oslo_concurrency import lockutils
@@ -24,7 +25,6 @@ from oslo_utils import excutils
 from osprofiler import opts as profiler_opts
 import osprofiler.sqlalchemy
 from pecan import util as p_util
-import six
 import sqlalchemy
 from sqlalchemy import event  # noqa
 from sqlalchemy import exc as sql_exc
@@ -129,7 +129,7 @@ def _tag_retriables_as_unretriable(f):
     This decorator can be used outside of a retry decorator to prevent
     decorators higher up from retrying again.
     """
-    @six.wraps(f)
+    @functools.wraps(f)
     def wrapped(*args, **kwargs):
         try:
             return f(*args, **kwargs)
@@ -169,7 +169,7 @@ def retry_db_errors(f):
 
     @_tag_retriables_as_unretriable
     @_retry_db_errors
-    @six.wraps(f)
+    @functools.wraps(f)
     def wrapped(*args, **kwargs):
         try:
             # copy mutable args and kwargs to make retries safe. this doesn't
@@ -221,7 +221,7 @@ def retry_if_session_inactive(context_var_name='context'):
             raise RuntimeError(msg)
         f_with_retry = retry_db_errors(f)
 
-        @six.wraps(f)
+        @functools.wraps(f)
         def wrapped(*args, **kwargs):
             # only use retry wrapper if we aren't nested in an active
             # transaction

neutron_lib/db/utils.py

@@ -10,7 +10,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import six
+import functools
 
 from oslo_db import exception as db_exc
 from oslo_utils import excutils
@@ -97,7 +97,7 @@ def reraise_as_retryrequest(function):
         Exception's as a RetryRequest.
     :raises RetryRequest: If the wrapped function raises retriable exception.
     """
-    @six.wraps(function)
+    @functools.wraps(function)
     def _wrapped(*args, **kwargs):
         try:
             return function(*args, **kwargs)

neutron_lib/exceptions/__init__.py

@@ -18,7 +18,6 @@ Neutron base exception handling.
 """
 
 from oslo_utils import excutils
-import six
 
 from neutron_lib._i18n import _
 
@@ -43,10 +42,6 @@ class NeutronException(Exception):
                     # at least get the core message out if something happened
                     super(NeutronException, self).__init__(self.message)
 
-    if six.PY2:
-        def __unicode__(self):
-            return unicode(self.msg)  # noqa
-
     def __str__(self):
         return self.msg
 

neutron_lib/fixture.py

@@ -384,8 +384,7 @@ class OpenFixture(fixtures.Fixture):
                 return self.mock_open(name, *args, **kwargs)
             return self._orig_open(name, *args, **kwargs)
 
-        self._patch = mock.patch('six.moves.builtins.open',
-                                 new=replacement_open)
+        self._patch = mock.patch('builtins.open', new=replacement_open)
         self._patch.start()
         self.addCleanup(self._patch.stop)
 

neutron_lib/hacking/checks.py

@@ -123,50 +123,6 @@ def check_no_contextlib_nested(logical_line, filename):
         yield(0, msg)
 
 
-def check_python3_xrange(logical_line):
-    """N525 - Do not use xrange.
-
-    :param logical_line: The logical line to check.
-    :returns: None if the logical line passes the check, otherwise a tuple
-        is yielded that contains the offending index in logical line and a
-        message describe the check validation failure.
-    """
-    if re.search(r"\bxrange\s*\(", logical_line):
-        yield(0, "N525: Do not use xrange. Use range, or six.moves.range for "
-                 "large loops.")
-
-
-def check_no_basestring(logical_line):
-    """N526 - basestring is not Python3-compatible.
-
-    :param logical_line: The logical line to check.
-    :returns: None if the logical line passes the check, otherwise a tuple
-        is yielded that contains the offending index in logical line and a
-        message describe the check validation failure.
-    """
-    if re.search(r"\bbasestring\b", logical_line):
-        msg = ("N526: basestring is not Python3-compatible, use "
-               "six.string_types instead.")
-        yield(0, msg)
-
-
-def check_python3_no_iteritems(logical_line):
-    """N527 - Use dict.items() instead of dict.iteritems().
-
-    :param logical_line: The logical line to check.
-    :returns: None if the logical line passes the check, otherwise a tuple
-        is yielded that contains the offending index in logical line and a
-        message describe the check validation failure.
-    """
-    if re.search(r".*\.iteritems\(\)", logical_line):
-        msg = ("N527: Use dict.items() instead of dict.iteritems() to be "
-               "compatible with both Python 2 and Python 3. In Python 2, "
-               "dict.items() may be inefficient for very large dictionaries. "
-               "If you can prove that you need the optimization of an "
-               "iterator for Python 2, then you can use six.iteritems(dict).")
-        yield(0, msg)
-
-
 def no_mutable_default_args(logical_line):
     """N529 - Method's default argument shouldn't be mutable.
 
@@ -235,9 +191,6 @@ def factory(register):
     """
     register(use_jsonutils)
     register(check_no_contextlib_nested)
-    register(check_python3_xrange)
-    register(check_no_basestring)
-    register(check_python3_no_iteritems)
     register(no_mutable_default_args)
     register(check_neutron_namespace_imports)
     register(translation_checks.no_translate_logs)

neutron_lib/objects/common_types.py

@@ -17,7 +17,6 @@ import uuid
 import netaddr
 from oslo_serialization import jsonutils
 from oslo_versionedobjects import fields as obj_fields
-import six
 
 from neutron_lib._i18n import _
 from neutron_lib import constants as lib_constants
@@ -45,7 +44,7 @@ class RangeConstrainedInteger(obj_fields.Integer):
         super(RangeConstrainedInteger, self).__init__(**kwargs)
 
     def coerce(self, obj, attr, value):
-        if not isinstance(value, six.integer_types):
+        if not isinstance(value, int):
             msg = _("Field value %s is not an integer") % value
             raise ValueError(msg)
         if not self._start <= value <= self._end:
@@ -101,7 +100,7 @@ class SetOfUUIDsField(obj_fields.AutoTypedField):
 
 class DomainName(obj_fields.String):
     def coerce(self, obj, attr, value):
-        if not isinstance(value, six.string_types):
+        if not isinstance(value, str):
             msg = _("Field value %s is not a string") % value
             raise ValueError(msg)
         if len(value) > lib_db_const.FQDN_FIELD_SIZE:
@@ -120,14 +119,14 @@ class IntegerEnum(obj_fields.Integer):
             msg = _("No possible values specified")
             raise ValueError(msg)
         for value in valid_values:
-            if not isinstance(value, six.integer_types):
+            if not isinstance(value, int):
                 msg = _("Possible value %s is not an integer") % value
                 raise ValueError(msg)
         self._valid_values = valid_values
         super(IntegerEnum, self).__init__(**kwargs)
 
     def coerce(self, obj, attr, value):
-        if not isinstance(value, six.integer_types):
+        if not isinstance(value, int):
             msg = _("Field value %s is not an integer") % value
             raise ValueError(msg)
         if value not in self._valid_values:
@@ -235,7 +234,7 @@ class DictOfMiscValues(obj_fields.FieldType):
     def coerce(obj, attr, value):
         if isinstance(value, dict):
             return value
-        if isinstance(value, six.string_types):
+        if isinstance(value, str):
             try:
                 return jsonutils.loads(value)
             except Exception:

neutron_lib/objects/utils.py

@@ -13,8 +13,6 @@
 import abc
 import copy
 
-import six
-
 from neutron_lib import exceptions
 
 
@@ -28,8 +26,7 @@ def convert_filters(**kwargs):
     return result
 
 
-@six.add_metaclass(abc.ABCMeta)
-class FilterObj(object):
+class FilterObj(object, metaclass=abc.ABCMeta):
 
     @abc.abstractmethod
     def filter(self, column):

neutron_lib/placement/client.py

@@ -16,6 +16,7 @@
 import functools
 import re
 import time
+from urllib import parse
 import uuid
 
 import requests
@@ -25,7 +26,6 @@ from keystoneauth1 import loading as keystone
 from oslo_log import log as logging
 from oslo_serialization import jsonutils
 from oslo_utils import versionutils
-from six.moves.urllib.parse import urlencode
 
 from neutron_lib._i18n import _
 from neutron_lib.exceptions import placement as n_exc
@@ -375,7 +375,7 @@ class PlacementAPIClient(object):
             filters['in_tree'] = in_tree
         if uuid:
             filters['uuid'] = uuid
-        url = '%s?%s' % (url, urlencode(filters))
+        url = '%s?%s' % (url, parse.urlencode(filters))
         return self._get(url).json()
 
     @_check_placement_api_available

neutron_lib/placement/utils.py

@@ -16,7 +16,6 @@ import uuid
 
 import os_traits
 from oslo_log import log as logging
-import six
 
 from neutron_lib._i18n import _
 from neutron_lib import constants as const
@@ -73,8 +72,6 @@ def six_uuid5(namespace, name):
     # cPython 3.6:
     # https://github.com/python/cpython/blob
     #        /e9e2fd75ccbc6e9a5221cf3525e39e9d042d843f/Lib/uuid.py#L628
-    if six.PY2:
-        name = name.encode('utf-8')
     return uuid.uuid5(namespace=namespace, name=name)
 
 

neutron_lib/plugins/ml2/api.py

@@ -14,8 +14,6 @@
 
 import abc
 
-import six
-
 
 # The following keys are used in the segment dictionaries passed via
 # the driver API.
@@ -33,8 +31,7 @@ BOUND_DRIVER = 'bound_driver'
 BOUND_SEGMENT = 'bound_segment'
 
 
-@six.add_metaclass(abc.ABCMeta)
-class MechanismDriver(object):
+class MechanismDriver(object, metaclass=abc.ABCMeta):
     """Define stable abstract interface for ML2 mechanism drivers.
 
     A mechanism driver is called on the creation, update, and deletion
@@ -459,8 +456,7 @@ class MechanismDriver(object):
         return []
 
 
-@six.add_metaclass(abc.ABCMeta)
-class _TypeDriverBase(object):
+class _TypeDriverBase(object, metaclass=abc.ABCMeta):
 
     @abc.abstractmethod
     def get_type(self):
@@ -520,8 +516,7 @@ class _TypeDriverBase(object):
         pass
 
 
-@six.add_metaclass(abc.ABCMeta)
-class TypeDriver(_TypeDriverBase):
+class TypeDriver(_TypeDriverBase, metaclass=abc.ABCMeta):
     """Define abstract interface for ML2 type drivers.
 
     ML2 type drivers each support a specific network_type for provider
@@ -592,8 +587,7 @@ class TypeDriver(_TypeDriverBase):
         pass
 
 
-@six.add_metaclass(abc.ABCMeta)
-class ML2TypeDriver(_TypeDriverBase):
+class ML2TypeDriver(_TypeDriverBase, metaclass=abc.ABCMeta):
     """Define abstract interface for ML2 type drivers.
 
     ML2 type drivers each support a specific network_type for provider
@@ -684,8 +678,7 @@ class ML2TypeDriver(_TypeDriverBase):
         pass
 
 
-@six.add_metaclass(abc.ABCMeta)
-class NetworkContext(object):
+class NetworkContext(object, metaclass=abc.ABCMeta):
     """Context passed to MechanismDrivers for changes to network resources.
 
     A NetworkContext instance wraps a network resource. It provides
@@ -722,8 +715,7 @@ class NetworkContext(object):
         pass
 
 
-@six.add_metaclass(abc.ABCMeta)
-class SubnetContext(object):
+class SubnetContext(object, metaclass=abc.ABCMeta):
     """Context passed to MechanismDrivers for changes to subnet resources.
 
     A SubnetContext instance wraps a subnet resource. It provides
@@ -755,8 +747,7 @@ class SubnetContext(object):
         pass
 
 
-@six.add_metaclass(abc.ABCMeta)
-class PortContext(object):
+class PortContext(object, metaclass=abc.ABCMeta):
     """Context passed to MechanismDrivers for changes to port resources.
 
     A PortContext instance wraps a port resource. It provides helper
@@ -1073,8 +1064,7 @@ class PortContext(object):
         pass
 
 
-@six.add_metaclass(abc.ABCMeta)
-class ExtensionDriver(object):
+class ExtensionDriver(object, metaclass=abc.ABCMeta):
     """Define stable abstract interface for ML2 extension drivers.
 
     An extension driver extends the core resources implemented by the

neutron_lib/services/base.py

@@ -12,8 +12,6 @@
 
 import abc
 
-import six
-
 
 class WorkerBase(object):
 
@@ -48,8 +46,7 @@ class WorkerBase(object):
         self._workers.extend(workers)
 
 
-@six.add_metaclass(abc.ABCMeta)
-class ServicePluginBase(WorkerBase):
+class ServicePluginBase(WorkerBase, metaclass=abc.ABCMeta):
     """Define base interface for any Advanced Service plugin."""
     supported_extension_aliases = []
 

neutron_lib/tests/unit/api/test_conversions.py

@@ -15,7 +15,6 @@
 
 import mock
 import netaddr
-import six
 import testtools
 
 from neutron_lib.api import converters
@@ -231,7 +230,7 @@ class TestConvertStringToCaseInsensitive(base.BaseTestCase):
 
     def test_convert_string_to_lower(self):
         result = converters.convert_string_to_case_insensitive(u"THIS Is tEsT")
-        self.assertIsInstance(result, six.string_types)
+        self.assertIsInstance(result, str)
 
     def test_assert_error_on_non_string(self):
         for invalid in [[], 123]:

neutron_lib/tests/unit/db/test_sqlalchemytypes.py

@@ -18,7 +18,6 @@ from oslo_db.sqlalchemy import enginefacade
 from oslo_db.sqlalchemy import test_fixtures
 from oslo_utils import timeutils
 from oslo_utils import uuidutils
-import six
 import sqlalchemy as sa
 
 from neutron_lib import context
@@ -28,9 +27,9 @@ from neutron_lib.tests import tools
 from neutron_lib.utils import net
 
 
-@six.add_metaclass(abc.ABCMeta)
 class SqlAlchemyTypesBaseTestCase(test_fixtures.OpportunisticDBTestMixin,
-                                  test_base.BaseTestCase):
+                                  test_base.BaseTestCase,
+                                  metaclass=abc.ABCMeta):
     def setUp(self):
         super(SqlAlchemyTypesBaseTestCase, self).setUp()
         self.engine = enginefacade.writer.get_engine()

neutron_lib/tests/unit/hacking/test_checks.py

@@ -87,24 +87,6 @@ class HackingTestCase(base.BaseTestCase):
         self.assertLinePasses(f, '# with contextlib.nested():', '')
         self.assertLinePasses(f, 'print("with contextlib.nested():")', '')
 
-    def test_check_python3_xrange(self):
-        f = checks.check_python3_xrange
-        self.assertLineFails(f, 'a = xrange(1000)')
-        self.assertLineFails(f, 'b =xrange   (   42 )')
-        self.assertLineFails(f, 'c = xrange(1, 10, 2)')
-        self.assertLinePasses(f, 'd = range(1000)')
-        self.assertLinePasses(f, 'e = six.moves.range(1337)')
-
-    def test_no_basestring(self):
-        f = checks.check_no_basestring
-        self.assertLineFails(f, 'isinstance(x, basestring)')
-        self.assertLinePasses(f, 'isinstance(x, BaseString)')
-
-    def test_check_python3_iteritems(self):
-        f = checks.check_python3_no_iteritems
-        self.assertLineFails(f, "d.iteritems()")
-        self.assertLinePasses(f, "six.iteritems(d)")
-
     def test_no_mutable_default_args(self):
         self.assertEqual(1, len(list(checks.no_mutable_default_args(
             " def fake_suds_context(calls={}):"))))

neutron_lib/tests/unit/test_worker.py

@@ -12,8 +12,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import six
-
 import mock
 
 from neutron_lib.callbacks import events
@@ -67,44 +65,44 @@ class TestBaseWorker(base.BaseTestCase):
     def test_proctitle_default(self):
         with mock.patch('setproctitle.setproctitle') as spt:
             _ProcWorker().start()
-            six.assertRegex(self, spt.call_args[0][0],
-                            '^neutron-server: _ProcWorker \\(.*python.*\\)$')
+            self.assertRegex(spt.call_args[0][0],
+                             '^neutron-server: _ProcWorker \\(.*python.*\\)$')
 
     def test_proctitle_custom_desc(self):
         with mock.patch('setproctitle.setproctitle') as spt:
             _ProcWorker().start(desc="fancy title")
-            six.assertRegex(self, spt.call_args[0][0],
-                            '^neutron-server: fancy title \\(.*python.*\\)$')
+            self.assertRegex(spt.call_args[0][0],
+                             '^neutron-server: fancy title \\(.*python.*\\)$')
 
     def test_proctitle_custom_name(self):
         with mock.patch('setproctitle.setproctitle') as spt:
             _ProcWorker().start(name="tardis")
-            six.assertRegex(self, spt.call_args[0][0],
-                            '^tardis: _ProcWorker \\(.*python.*\\)$')
+            self.assertRegex(spt.call_args[0][0],
+                             '^tardis: _ProcWorker \\(.*python.*\\)$')
 
     def test_proctitle_empty(self):
         with mock.patch('setproctitle.setproctitle') as spt:
             _ProcWorker().start(desc="")
-            six.assertRegex(self, spt.call_args[0][0],
-                            '^neutron-server: _ProcWorker \\(.*python.*\\)$')
+            self.assertRegex(spt.call_args[0][0],
+                             '^neutron-server: _ProcWorker \\(.*python.*\\)$')
 
     def test_proctitle_nonstring(self):
         with mock.patch('setproctitle.setproctitle') as spt:
             _ProcWorker().start(desc=2)
-            six.assertRegex(self, spt.call_args[0][0],
-                            '^neutron-server: 2 \\(.*python.*\\)$')
+            self.assertRegex(spt.call_args[0][0],
+                             '^neutron-server: 2 \\(.*python.*\\)$')
 
     def test_proctitle_both_empty(self):
         with mock.patch('setproctitle.setproctitle') as spt:
             _ProcWorker().start(name="", desc="")
-            six.assertRegex(self, spt.call_args[0][0],
-                            '^: _ProcWorker \\(.*python.*\\)$')
+            self.assertRegex(spt.call_args[0][0],
+                             '^: _ProcWorker \\(.*python.*\\)$')
 
     def test_proctitle_name_none(self):
         with mock.patch('setproctitle.setproctitle') as spt:
             _ProcWorker().start(name=None)
-            six.assertRegex(self, spt.call_args[0][0],
-                            '^None: _ProcWorker \\(.*python.*\\)$')
+            self.assertRegex(spt.call_args[0][0],
+                             '^None: _ProcWorker \\(.*python.*\\)$')
 
     # Forked, but proctitle disabled
 
@@ -123,8 +121,8 @@ class TestBaseWorker(base.BaseTestCase):
     def test_setproctitle_on(self):
         with mock.patch('setproctitle.setproctitle') as spt:
             _ProcWorker(set_proctitle='on').start(name="foo", desc="bar")
-            six.assertRegex(self, spt.call_args[0][0],
-                            '^foo: bar \\(.*python.*\\)$')
+            self.assertRegex(spt.call_args[0][0],
+                             '^foo: bar \\(.*python.*\\)$')
 
     def test_setproctitle_off(self):
         with mock.patch('setproctitle.setproctitle') as spt:

neutron_lib/tests/unit/utils/test_helpers.py

@@ -14,7 +14,6 @@
 import collections
 import re
 
-import six
 import testtools
 
 from neutron_lib.tests import _base as base
@@ -160,33 +159,18 @@ class TestGetRandomString(base.BaseTestCase):
         self.assertIsNotNone(regex.match(random_string))
 
 
-def requires_py2(testcase):
-    return testtools.skipUnless(six.PY2, "requires python 2.x")(testcase)
-
-
-def requires_py3(testcase):
-    return testtools.skipUnless(six.PY3, "requires python 3.x")(testcase)
-
-
 class TestSafeDecodeUtf8(base.BaseTestCase):
 
-    @requires_py2
-    def test_py2_does_nothing(self):
-        s = 'test-py2'
-        self.assertIs(s, helpers.safe_decode_utf8(s))
-
-    @requires_py3
     def test_py3_decoded_valid_bytes(self):
         s = bytes('test-py2', 'utf-8')
         decoded_str = helpers.safe_decode_utf8(s)
-        self.assertIsInstance(decoded_str, six.text_type)
+        self.assertIsInstance(decoded_str, str)
         self.assertEqual(s, decoded_str.encode('utf-8'))
 
-    @requires_py3
     def test_py3_decoded_invalid_bytes(self):
         s = bytes('test-py2', 'utf_16')
         decoded_str = helpers.safe_decode_utf8(s)
-        self.assertIsInstance(decoded_str, six.text_type)
+        self.assertIsInstance(decoded_str, str)
 
 
 class TestSafeSortKey(base.BaseTestCase):

neutron_lib/utils/helpers.py

@@ -16,8 +16,6 @@ import decimal
 import random
 import weakref
 
-import six
-
 from neutron_lib._i18n import _
 
 
@@ -174,7 +172,7 @@ def safe_decode_utf8(s):
     :param s: The str to decode.
     :returns: The decoded str.
     """
-    if six.PY3 and isinstance(s, bytes):
+    if isinstance(s, bytes):
         return s.decode('utf-8', 'surrogateescape')
     return s
 

neutron_lib/utils/net.py

@@ -15,7 +15,6 @@ import random
 import socket
 
 import netaddr
-import six
 
 from neutron_lib import constants
 
@@ -96,7 +95,7 @@ class _AuthenticBase(object):
         self._initial_value = addr
 
     def __str__(self):
-        if isinstance(self._initial_value, six.string_types):
+        if isinstance(self._initial_value, str):
             return self._initial_value
         return super(_AuthenticBase, self).__str__()
 

neutron_lib/utils/upgrade_checks.py

@@ -14,11 +14,8 @@
 
 import abc
 
-import six
 
-
-@six.add_metaclass(abc.ABCMeta)
-class BaseChecks(object):
+class BaseChecks(object, metaclass=abc.ABCMeta):
 
     """Base class providing upgrade checks.
 

requirements.txt

@@ -8,7 +8,6 @@ SQLAlchemy>=1.2.0 # MIT
 pecan!=1.0.2,!=1.0.3,!=1.0.4,!=1.2,>=1.0.0 # BSD
 keystoneauth1>=3.4.0 # Apache-2.0
 netaddr>=0.7.18 # BSD
-six>=1.10.0 # MIT
 stevedore>=1.20.0 # Apache-2.0
 os-ken >= 0.3.0 # Apache-2.0
 oslo.concurrency>=3.26.0 # Apache-2.0

tools/pyir.py

@@ -331,8 +331,7 @@ def ordered(obj):
 
 
 def json_primitive(val):
-    if isinstance(val, (six.string_types, six.text_type,
-                        six.integer_types, bool)):
+    if isinstance(val, (str, int, bool)):
         return str(val)
     elif str(val).startswith('<') or type(val) in [dict, list, set, tuple]:
         return str(type(val))
@@ -697,8 +696,7 @@ class PyLineTokens(object):
     CLOSED_B = ')'
 
 
-@six.add_metaclass(abc.ABCMeta)
-class AbstractFilter(object):
+class AbstractFilter(object, metaclass=abc.ABCMeta):
 
     @abc.abstractmethod
     def mark(self, py_line):
@@ -709,8 +707,7 @@ class AbstractFilter(object):
         pass
 
 
-@six.add_metaclass(abc.ABCMeta)
-class AbstractPerFileFilter(AbstractFilter):
+class AbstractPerFileFilter(AbstractFilter, metaclass=abc.ABCMeta):
 
     def __init__(self):
         self._marked = []
@@ -855,8 +852,7 @@ class RemoveCommentLines(AbstractFilter):
             py_file.del_line(py_line)
 
 
-@six.add_metaclass(abc.ABCMeta)
-class AbstractMultiLineCollector(AbstractFilter):
+class AbstractMultiLineCollector(AbstractFilter, metaclass=abc.ABCMeta):
 
     def __init__(self):
         self._comment_stripper = StripTrailingComments()
@@ -1330,8 +1326,7 @@ class APIReport(object):
         }
 
 
-@six.add_metaclass(abc.ABCMeta)
-class AbstractCommand(object):
+class AbstractCommand(object, metaclass=abc.ABCMeta):
 
     @abc.abstractmethod
     def get_parser(self):