Remove usage of six

With python3.x, classes can use 'metaclass=' instead of
'six.add_metaclass', 'six.integer_type' can be replaced
by 'int', 'six.string_type' and 'six.text_type' are just
'str'.

Change-Id: I40a020aa4a8e69a8dd7e800352dc54a9e694d500

.pylintrc

@@ -123,7 +123,7 @@ deprecated-modules=
 
 [TYPECHECK]
 # List of module names for which member attributes should not be checked
-ignored-modules=six.moves,_MovedItems
+ignored-modules=
 
 [REPORTS]
 # Tells whether to display a full report or only the messages

lower-constraints.txt

@@ -119,7 +119,6 @@ requestsexceptions==1.2.0
 rfc3986==0.3.1
 Routes==2.3.1
 simplejson==3.5.1
-six==1.10.0
 snowballstemmer==1.2.1
 Sphinx==1.6.5
 sphinxcontrib-svg2pdfconverter==0.1.0 # BSD

neutron_dynamic_routing/__init__.py

@@ -15,10 +15,5 @@
 
 import gettext
 
-import six
 
-
-if six.PY2:
-    gettext.install('neutron', unicode=1)
-else:
 gettext.install('neutron')

neutron_dynamic_routing/extensions/bgp_dragentscheduler.py

@@ -24,7 +24,6 @@ from neutron_lib import exceptions as n_exc
 from neutron_lib.exceptions import agent as agent_exc
 from neutron_lib.plugins import directory
 from oslo_log import log as logging
-import six
 import webob
 
 from neutron_dynamic_routing._i18n import _, _LE
@@ -145,8 +144,7 @@ class Bgp_dragentscheduler(api_extensions.ExtensionDescriptor):
         return {}
 
 
-@six.add_metaclass(abc.ABCMeta)
-class BgpDrSchedulerPluginBase(object):
+class BgpDrSchedulerPluginBase(object, metaclass=abc.ABCMeta):
     """REST API to operate BGP dynamic routing agent scheduler.
 
     All the methods must be executed in admin context.

neutron_dynamic_routing/services/bgp/agent/driver/base.py

@@ -15,11 +15,8 @@
 
 import abc
 
-import six
 
-
-@six.add_metaclass(abc.ABCMeta)
-class BgpDriverBase(object):
+class BgpDriverBase(object, metaclass=abc.ABCMeta):
     """Base class for BGP Speaking drivers.
 
     Any class which provides BGP functionality should extend this

neutron_dynamic_routing/services/bgp/agent/driver/utils.py

@@ -14,7 +14,6 @@
 # limitations under the License.
 
 import netaddr
-import six
 
 from neutron_lib import constants as lib_consts
 
@@ -24,7 +23,7 @@ from neutron_dynamic_routing.services.bgp.common import constants as bgp_consts
 
 # Parameter validation functions provided are provided by the base.
 def validate_as_num(param, as_num):
-    if not isinstance(as_num, six.integer_types):
+    if not isinstance(as_num, int):
         raise bgp_driver_exc.InvalidParamType(param=param,
                                               param_type='integer')
 
@@ -61,7 +60,7 @@ def validate_ip_addr(ip_addr):
 
 def validate_string(param):
     if param is not None:
-        if not isinstance(param, six.string_types):
+        if not isinstance(param, str):
             raise bgp_driver_exc.InvalidParamType(param=param,
                                                   param_type='string')
 

neutron_dynamic_routing/tests/unit/services/bgp/driver/os_ken/test_driver.py

@@ -20,7 +20,6 @@ from os_ken.services.protocols.bgp import bgpspeaker
 from os_ken.services.protocols.bgp.rtconf.neighbors import CONNECT_MODE_ACTIVE
 from oslo_config import cfg
 from oslo_utils import encodeutils
-import six
 
 from neutron_dynamic_routing.services.bgp.agent import config as bgp_config
 from neutron_dynamic_routing.services.bgp.agent.driver import exceptions as bgp_driver_exc  # noqa
@@ -112,7 +111,7 @@ class TestOsKenBgpDriver(base.BaseTestCase):
         self.os_ken_bgp_driver.add_bgp_speaker(FAKE_LOCAL_AS1)
         self.assertEqual(1,
                 self.os_ken_bgp_driver.cache.get_hosted_bgp_speakers_count())
-        NEW_FAKE_PEER_PASSWORD = six.text_type(FAKE_PEER_PASSWORD)
+        NEW_FAKE_PEER_PASSWORD = str(FAKE_PEER_PASSWORD)
         self.os_ken_bgp_driver.add_bgp_peer(
             FAKE_LOCAL_AS1,
             FAKE_PEER_IP,

requirements.txt

@@ -8,7 +8,6 @@ httplib2>=0.9.1 # MIT
 netaddr>=0.7.18 # BSD
 SQLAlchemy>=1.2.0 # MIT
 alembic>=0.8.10 # MIT
-six>=1.10.0 # MIT
 neutron-lib>=1.26.0 # Apache-2.0
 os-ken>=0.3.0 # Apache-2.0
 oslo.config>=5.2.0 # Apache-2.0