Remove usage of six

With python3.x, classes can use 'metaclass=' instead of
'six.add_metaclass', 'six.iteritems' and 'six.iterkeys' can
be replaced by 'items' and 'keys', 'six.moves.urllib.parse'
can be replaced by 'urllib.parse', 'six.StringIO' and
'six.moves.cStringIO' can be replaced by 'io.StringIO',
'six.text_type' and 'six.string_type' are just 'str'.

Change-Id: I357968c6a1932856b1600f6c191966bc90cbc258

16 files changed, 34 insertions, 52 deletions

diff --git a/lower-constraints.txt b/lower-constraints.txt
index 08d37a4..48b0056 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -97,7 +97,6 @@ requestsexceptions==1.2.0
 rfc3986==0.3.1
 Routes==2.3.1
 simplejson==3.5.1
-six==1.10.0
 snowballstemmer==1.2.1
 statsd==3.2.1
 stestr==2.0.0
diff --git a/neutronclient/common/exceptions.py b/neutronclient/common/exceptions.py
index 1040ee1..443f781 100644
--- a/neutronclient/common/exceptions.py
+++ b/neutronclient/common/exceptions.py
@@ -14,7 +14,6 @@
 #    under the License.
 
 from oslo_utils import encodeutils
-import six
 
 from neutronclient._i18n import _
 
@@ -40,7 +39,6 @@ def _safe_decode_dict(kwargs):
     return kwargs
 
 
-@six.python_2_unicode_compatible
 class NeutronException(Exception):
     """Base Neutron Exception.
 
diff --git a/neutronclient/common/serializer.py b/neutronclient/common/serializer.py
index 98865a6..d4c8bbb 100644
--- a/neutronclient/common/serializer.py
+++ b/neutronclient/common/serializer.py
@@ -14,7 +14,6 @@
 #    under the License.
 
 from oslo_serialization import jsonutils
-import six
 
 from neutronclient._i18n import _
 from neutronclient.common import exceptions as exception
@@ -48,7 +47,7 @@ class JSONDictSerializer(DictSerializer):
 
     def default(self, data):
         def sanitizer(obj):
-            return six.text_type(obj)
+            return str(obj)
         return jsonutils.dumps(data, default=sanitizer)
 
 
diff --git a/neutronclient/common/utils.py b/neutronclient/common/utils.py
index b61ee3b..3827401 100644
--- a/neutronclient/common/utils.py
+++ b/neutronclient/common/utils.py
@@ -25,7 +25,6 @@ import os
 
 from oslo_utils import encodeutils
 from oslo_utils import importutils
-import six
 
 from neutronclient._i18n import _
 from neutronclient.common import exceptions
@@ -180,7 +179,7 @@ def http_log_req(_logger, args, kwargs):
         else:
             string_parts.append(' %s' % element)
 
-    for (key, value) in six.iteritems(kwargs['headers']):
+    for (key, value) in kwargs['headers'].items():
         if key in SENSITIVE_HEADERS:
             v = value.encode('utf-8')
             h = hashlib.sha256(v)
@@ -205,7 +204,7 @@ def http_log_resp(_logger, resp, body):
 
 
 def _safe_encode_without_obj(data):
-    if isinstance(data, six.string_types):
+    if isinstance(data, str):
         return encodeutils.safe_encode(data)
     return data
 
diff --git a/neutronclient/neutron/v2_0/__init__.py b/neutronclient/neutron/v2_0/__init__.py
index a5b262c..3a6e086 100644
--- a/neutronclient/neutron/v2_0/__init__.py
+++ b/neutronclient/neutron/v2_0/__init__.py
@@ -25,7 +25,6 @@ from cliff import command
 from cliff import lister
 from cliff import show
 from oslo_serialization import jsonutils
-import six
 
 from neutronclient._i18n import _
 from neutronclient.common import exceptions
@@ -261,12 +260,12 @@ def parse_args_to_dict(values_specs):
 
     # Populate the parser with arguments
     _parser = argparse.ArgumentParser(add_help=False)
-    for opt, optspec in six.iteritems(_options):
+    for opt, optspec in _options.items():
         _parser.add_argument(opt, **optspec)
     _args = _parser.parse_args(_values_specs)
 
     result_dict = {}
-    for opt in six.iterkeys(_options):
+    for opt in _options.keys():
         _opt = opt.split('--', 2)[1]
         _opt = _opt.replace('-', '_')
         _value = getattr(_args, _opt)
@@ -285,7 +284,7 @@ def _merge_args(qCmd, parsed_args, _extra_values, value_specs):
     @param values_specs: the unparsed unknown parts
     """
     temp_values = _extra_values.copy()
-    for key, value in six.iteritems(temp_values):
+    for key, value in temp_values.items():
         if hasattr(parsed_args, key):
             arg_value = getattr(parsed_args, key)
             if arg_value is not None and value is not None:
@@ -321,8 +320,7 @@ class NeutronCommandMeta(abc.ABCMeta):
                                                       name, bases, cls_dict)
 
 
-@six.add_metaclass(NeutronCommandMeta)
-class NeutronCommand(command.Command):
+class NeutronCommand(command.Command, metaclass=NeutronCommandMeta):
 
     values_specs = []
     json_indent = None
@@ -363,7 +361,7 @@ class NeutronCommand(command.Command):
     def format_output_data(self, data):
         # Modify data to make it more readable
         if self.resource in data:
-            for k, v in six.iteritems(data[self.resource]):
+            for k, v in data[self.resource].items():
                 if isinstance(v, list):
                     value = '\n'.join(jsonutils.dumps(
                         i, indent=self.json_indent) if isinstance(i, dict)
@@ -425,7 +423,7 @@ class CreateCommand(NeutronCommand, show.ShowOne):
                       file=self.app.stdout)
         else:
             info = {'': ''}
-        return zip(*sorted(six.iteritems(info)))
+        return zip(*sorted(info.items()))
 
 
 class UpdateCommand(NeutronCommand):
@@ -825,6 +823,6 @@ class ShowCommand(NeutronCommand, show.ShowOne):
             self.format_output_data(data)
         resource = data[self.resource]
         if self.resource in data:
-            return zip(*sorted(six.iteritems(resource)))
+            return zip(*sorted(resource.items()))
         else:
             return None
diff --git a/neutronclient/neutron/v2_0/lb/pool.py b/neutronclient/neutron/v2_0/lb/pool.py
index afc0cc1..5684e8e 100644
--- a/neutronclient/neutron/v2_0/lb/pool.py
+++ b/neutronclient/neutron/v2_0/lb/pool.py
@@ -14,9 +14,6 @@
 #    under the License.
 #
 
-
-import six
-
 from neutronclient._i18n import _
 from neutronclient.neutron import v2_0 as neutronV20
 
@@ -119,6 +116,6 @@ class RetrievePoolStats(neutronV20.ShowCommand):
         self.format_output_data(data)
         stats = data['stats']
         if 'stats' in data:
-            return zip(*sorted(six.iteritems(stats)))
+            return zip(*sorted(stats.items()))
         else:
             return None
diff --git a/neutronclient/neutron/v2_0/network_ip_availability.py b/neutronclient/neutron/v2_0/network_ip_availability.py
index d1332a2..ba7af8f 100644
--- a/neutronclient/neutron/v2_0/network_ip_availability.py
+++ b/neutronclient/neutron/v2_0/network_ip_availability.py
@@ -12,7 +12,6 @@
 #
 
 from cliff import show
-import six
 
 from neutronclient._i18n import _
 from neutronclient.neutron import v2_0 as neutronV20
@@ -68,6 +67,6 @@ class ShowIpAvailability(neutronV20.NeutronCommand, show.ShowOne):
         self.format_output_data(data)
         resource = data[self.resource]
         if self.resource in data:
-            return zip(*sorted(six.iteritems(resource)))
+            return zip(*sorted(resource.items()))
         else:
             return None
diff --git a/neutronclient/neutron/v2_0/quota.py b/neutronclient/neutron/v2_0/quota.py
index 6e7058d..1a59ac5 100644
--- a/neutronclient/neutron/v2_0/quota.py
+++ b/neutronclient/neutron/v2_0/quota.py
@@ -22,7 +22,6 @@ import argparse
 from cliff import lister
 from cliff import show
 from oslo_serialization import jsonutils
-import six
 
 from neutronclient._i18n import _
 from neutronclient.common import exceptions
@@ -121,7 +120,7 @@ class ShowQuotaBase(neutronV20.NeutronCommand, show.ShowOne):
         tenant_id = get_tenant_id(parsed_args, neutron_client)
         data = self.retrieve_data(tenant_id, neutron_client)
         if self.resource in data:
-            return zip(*sorted(six.iteritems(data[self.resource])))
+            return zip(*sorted(data[self.resource].items()))
         return
 
 
@@ -241,7 +240,7 @@ class UpdateQuota(neutronV20.NeutronCommand, show.ShowOne):
         tenant_id = get_tenant_id(parsed_args, neutron_client)
         data = obj_updator(tenant_id, body)
         if self.resource in data:
-            for k, v in six.iteritems(data[self.resource]):
+            for k, v in data[self.resource].items():
                 if isinstance(v, list):
                     value = ""
                     for _item in v:
@@ -254,6 +253,6 @@ class UpdateQuota(neutronV20.NeutronCommand, show.ShowOne):
                     data[self.resource][k] = value
                 elif v is None:
                     data[self.resource][k] = ''
-            return zip(*sorted(six.iteritems(data[self.resource])))
+            return zip(*sorted(data[self.resource].items()))
         else:
             return
diff --git a/neutronclient/tests/unit/test_casual_args.py b/neutronclient/tests/unit/test_casual_args.py
index f2ca031..cbf0616 100644
--- a/neutronclient/tests/unit/test_casual_args.py
+++ b/neutronclient/tests/unit/test_casual_args.py
@@ -14,7 +14,6 @@
 #    under the License.
 #
 
-import six
 import testtools
 
 from neutronclient.common import exceptions
@@ -116,7 +115,7 @@ class CLITestArgs(testtools.TestCase):
                                neutronV20.parse_args_to_dict, _specs)
         self.assertEqual('Invalid value_specs --badtypearg type=badtype val1: '
                          'type badtype is not supported',
-                         six.text_type(ex))
+                         str(ex))
 
     def test_clear_action(self):
         _specs = ['--anyarg', 'action=clear']
@@ -128,7 +127,7 @@ class CLITestArgs(testtools.TestCase):
         ex = self.assertRaises(exceptions.CommandError,
                                neutronV20.parse_args_to_dict, _specs)
         self.assertEqual('Invalid values_specs --strarg type=str',
-                         six.text_type(ex))
+                         str(ex))
 
     def test_bad_values_list(self):
         _specs = ['--listarg', 'list=true', 'type=str']
diff --git a/neutronclient/tests/unit/test_cli20.py b/neutronclient/tests/unit/test_cli20.py
index 3a8bb47..73104b5 100644
--- a/neutronclient/tests/unit/test_cli20.py
+++ b/neutronclient/tests/unit/test_cli20.py
@@ -15,16 +15,16 @@
 #
 
 import contextlib
+from io import StringIO
 import itertools
 import sys
+import urllib.parse as urlparse
 
 import mock
 from oslo_serialization import jsonutils
 from oslo_utils import encodeutils
 from oslotest import base
 import requests
-import six
-import six.moves.urllib.parse as urlparse
 import yaml
 
 from neutronclient.common import constants
@@ -43,7 +43,7 @@ REQUEST_ID = 'test_request_id'
 
 @contextlib.contextmanager
 def capture_std_streams():
-    fake_stdout, fake_stderr = six.StringIO(), six.StringIO()
+    fake_stdout, fake_stderr = StringIO(), StringIO()
     stdout, stderr = sys.stdout, sys.stderr
     try:
         sys.stdout, sys.stderr = fake_stdout, fake_stderr
@@ -125,7 +125,7 @@ class MyComparator(object):
     def _com_dict(self, lhs, rhs):
         if len(lhs) != len(rhs):
             return False
-        for key, value in six.iteritems(lhs):
+        for key, value in lhs.items():
             if key not in rhs:
                 return False
             rhs_value = rhs[key]
@@ -743,7 +743,7 @@ class ClientV2TestJson(CLITestV20Base):
 
     def test_do_request_error_without_response_body(self):
         params = {'test': 'value'}
-        expect_query = six.moves.urllib.parse.urlencode(params)
+        expect_query = urlparse.urlencode(params)
         self.client.httpclient.auth_token = 'token'
         resp_headers = {'x-openstack-request-id': REQUEST_ID}
         resp = (MyResp(400, headers=resp_headers, reason='An error'), '')
@@ -772,7 +772,7 @@ class ClientV2TestJson(CLITestV20Base):
 
     def test_do_request_request_ids(self):
         params = {'test': 'value'}
-        expect_query = six.moves.urllib.parse.urlencode(params)
+        expect_query = urlparse.urlencode(params)
         self.client.httpclient.auth_token = 'token'
         body = params
         expect_body = self.client.serialize(body)
@@ -866,7 +866,7 @@ class ClientV2TestJson(CLITestV20Base):
 
     def test_update_resource(self):
         params = {'test': 'value'}
-        expect_query = six.moves.urllib.parse.urlencode(params)
+        expect_query = urlparse.urlencode(params)
         self.client.httpclient.auth_token = 'token'
         body = params
         expect_body = self.client.serialize(body)
@@ -889,7 +889,7 @@ class ClientV2TestJson(CLITestV20Base):
 
     def test_update_resource_with_revision_number(self):
         params = {'test': 'value'}
-        expect_query = six.moves.urllib.parse.urlencode(params)
+        expect_query = urlparse.urlencode(params)
         self.client.httpclient.auth_token = 'token'
         body = params
         expect_body = self.client.serialize(body)
diff --git a/neutronclient/tests/unit/test_cli20_securitygroup.py b/neutronclient/tests/unit/test_cli20_securitygroup.py
index 0f5a240..010f7dc 100644
--- a/neutronclient/tests/unit/test_cli20_securitygroup.py
+++ b/neutronclient/tests/unit/test_cli20_securitygroup.py
@@ -15,10 +15,10 @@
 #    under the License.
 
 import sys
+import urllib.parse as urlparse
 
 import mock
 from oslo_utils import uuidutils
-import six
 
 from neutronclient.common import exceptions
 from neutronclient.common import utils
@@ -250,7 +250,7 @@ class CLITestV20SecurityGroupsJSON(test_cli20.CLITestV20Base):
             resp_str = self.client.serialize({'security_groups': response})
 
             result.append({
-                'filter': six.moves.urllib.parse.urlencode(params, doseq=1),
+                'filter': urlparse.urlencode(params, doseq=1),
                 'response': (test_cli20.MyResp(200), resp_str),
             })
 
diff --git a/neutronclient/tests/unit/test_exceptions.py b/neutronclient/tests/unit/test_exceptions.py
index aefc24c..50b2bdb 100644
--- a/neutronclient/tests/unit/test_exceptions.py
+++ b/neutronclient/tests/unit/test_exceptions.py
@@ -16,7 +16,6 @@ import sys
 
 import mock
 from oslo_utils import encodeutils
-import six
 import testtools
 
 from neutronclient._i18n import _
@@ -46,4 +45,4 @@ class TestExceptions(testtools.TestCase):
         multibyte_binary = encodeutils.safe_encode(multibyte_string)
         e = TestException(reason=multibyte_binary)
         self.assertEqual('Exception with %s' % multibyte_string,
-                         six.text_type(e))
+                         str(e))
diff --git a/neutronclient/tests/unit/test_http.py b/neutronclient/tests/unit/test_http.py
index d76e9bc..5680d43 100644
--- a/neutronclient/tests/unit/test_http.py
+++ b/neutronclient/tests/unit/test_http.py
@@ -19,7 +19,6 @@ from oslo_utils import uuidutils
 import osprofiler.profiler
 import osprofiler.web
 from requests_mock.contrib import fixture as mock_fixture
-import six
 import testtools
 
 from neutronclient import client
@@ -33,8 +32,7 @@ URL = 'http://test.test:1234/v2.0/test'
 BODY = 'IAMFAKE'
 
 
-@six.add_metaclass(abc.ABCMeta)
-class TestHTTPClientMixin(object):
+class TestHTTPClientMixin(object, metaclass=abc.ABCMeta):
 
     def setUp(self):
         super(TestHTTPClientMixin, self).setUp()
diff --git a/neutronclient/tests/unit/test_shell.py b/neutronclient/tests/unit/test_shell.py
index 0395d62..86250a1 100644
--- a/neutronclient/tests/unit/test_shell.py
+++ b/neutronclient/tests/unit/test_shell.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 import argparse
+from io import StringIO
 import logging
 import os
 import re
@@ -22,7 +23,6 @@ import sys
 import fixtures
 from keystoneauth1 import session
 import mock
-import six
 import testtools
 from testtools import matchers
 
@@ -75,8 +75,8 @@ class ShellTest(testtools.TestCase):
         clean_env = {}
         _old_env, os.environ = os.environ, clean_env.copy()
         try:
-            sys.stdout = six.moves.cStringIO()
-            sys.stderr = six.moves.cStringIO()
+            sys.stdout = StringIO()
+            sys.stderr = StringIO()
             _shell = openstack_shell.NeutronShell('2.0')
             _shell.run(argstr.split())
         except SystemExit:
diff --git a/neutronclient/v2_0/client.py b/neutronclient/v2_0/client.py
index 5fa8698..13f90e4 100644
--- a/neutronclient/v2_0/client.py
+++ b/neutronclient/v2_0/client.py
@@ -21,12 +21,11 @@ import itertools
 import logging
 import re
 import time
+import urllib.parse as urlparse
 
 import debtcollector.renames
 from keystoneauth1 import exceptions as ksa_exc
 import requests
-import six.moves.urllib.parse as urlparse
-from six import string_types
 
 from neutronclient._i18n import _
 from neutronclient import client
@@ -398,7 +397,7 @@ class ClientBase(object):
         if item:
             if isinstance(item, dict):
                 return _DictWithMeta(item, resp)
-            elif isinstance(item, string_types):
+            elif isinstance(item, str):
                 return _StrWithMeta(item, resp)
         else:
             return _TupleWithMeta((), resp)
diff --git a/requirements.txt b/requirements.txt
index 5204dc2..c1c9c28 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,4 +18,3 @@ keystoneauth1>=3.4.0 # Apache-2.0
 python-keystoneclient>=3.8.0 # Apache-2.0
 requests>=2.14.2 # Apache-2.0
 simplejson>=3.5.1 # MIT
-six>=1.10.0 # MIT