Remove six

Python 2 is no longer supported, so we no longer need the six library.
This change removes usage of the library as well as reference to it
(and Python 2) from the documentation.

Change-Id: I6328b11dcad54f70f64ecff53eb60708e34351cf

9 files changed, 31 insertions, 45 deletions

diff --git a/barbicanclient/tests/test_barbican.py b/barbicanclient/tests/test_barbican.py
index c34be55..71ce182 100644
--- a/barbicanclient/tests/test_barbican.py
+++ b/barbicanclient/tests/test_barbican.py
@@ -12,7 +12,7 @@
 # implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-import six
+import io
 
 from barbicanclient import barbican as barb
 from barbicanclient.barbican import Barbican
@@ -26,8 +26,8 @@ class WhenTestingBarbicanCLI(test_client.BaseEntityResource):
 
     def setUp(self):
         self._setUp('barbican')
-        self.captured_stdout = six.StringIO()
-        self.captured_stderr = six.StringIO()
+        self.captured_stdout = io.StringIO()
+        self.captured_stderr = io.StringIO()
         self.barbican = Barbican(
             stdout=self.captured_stdout,
             stderr=self.captured_stderr
diff --git a/barbicanclient/tests/v1/test_containers.py b/barbicanclient/tests/v1/test_containers.py
index 3cbdd92..291a07e 100644
--- a/barbicanclient/tests/v1/test_containers.py
+++ b/barbicanclient/tests/v1/test_containers.py
@@ -17,7 +17,6 @@ from unittest import mock
 
 from oslo_serialization import jsonutils
 from oslo_utils import timeutils
-import six
 
 from barbicanclient import base
 from barbicanclient.tests import test_client
@@ -524,7 +523,7 @@ class WhenTestingContainers(test_client.BaseEntityResource):
 
         # Verify that the names of the secret_refs in the containers are None
         for container in containers_list:
-            for name in six.iterkeys(container._secret_refs):
+            for name in container._secret_refs.keys():
                 self.assertIsNone(name)
 
     def test_should_fail_get_invalid_container(self):
diff --git a/barbicanclient/tests/v1/test_secrets.py b/barbicanclient/tests/v1/test_secrets.py
index dcc2fdf..ef3f61b 100644
--- a/barbicanclient/tests/v1/test_secrets.py
+++ b/barbicanclient/tests/v1/test_secrets.py
@@ -93,7 +93,7 @@ class WhenTestingSecrets(test_client.BaseEntityResource):
         self.assertEqual(self.secret.payload, secret_req['payload'])
 
     def test_should_store_binary_type_as_octet_stream(self):
-        """We use six.binary_type as the canonical binary type.
+        """We use bytes as the canonical binary type.
 
         The client should base64 encode the payload before sending the
         request.
@@ -101,8 +101,6 @@ class WhenTestingSecrets(test_client.BaseEntityResource):
         data = {'secret_ref': self.entity_href}
         self.responses.post(self.entity_base + '/', json=data)
 
-        # This literal will have type(str) in Python 2, but will have
-        # type(bytes) in Python 3.  It is six.binary_type in both cases.
         binary_payload = b'F\x130\x89f\x8e\xd9\xa1\x0e\x1f\r\xf67uu\x8b'
 
         secret = self.manager.create()
@@ -119,12 +117,10 @@ class WhenTestingSecrets(test_client.BaseEntityResource):
         self.assertNotEqual(binary_payload, secret_req['payload'])
 
     def test_should_store_text_type_as_text_plain(self):
-        """We use six.text_type as the canonical text type."""
+        """We use unicode string as the canonical text type."""
         data = {'secret_ref': self.entity_href}
         self.responses.post(self.entity_base + '/', json=data)
 
-        # This literal will have type(unicode) in Python 2, but will have
-        # type(str) in Python 3.  It is six.text_type in both cases.
         text_payload = u'time for an ice cold \U0001f37a'
 
         secret = self.manager.create()
@@ -448,8 +444,6 @@ class WhenTestingSecrets(test_client.BaseEntityResource):
         self.test_should_delete_from_object(self.entity_id)
 
     def test_should_update_from_manager(self, secret_ref=None):
-        # This literal will have type(unicode) in Python 2, but will have
-        # type(str) in Python 3.  It is six.text_type in both cases.
         text_payload = u'time for an ice cold \U0001f37a'
         secret_ref = secret_ref or self.entity_href
 
@@ -479,8 +473,6 @@ class WhenTestingSecrets(test_client.BaseEntityResource):
         # Verify the secret has the correct ref for testing updates
         self.assertEqual(secref_ref, secret.secret_ref)
 
-        # This literal will have type(unicode) in Python 2, but will have
-        # type(str) in Python 3.  It is six.text_type in both cases.
         text_payload = u'time for an ice cold \U0001f37a'
 
         self.responses.put(self.entity_href, status_code=204)
diff --git a/barbicanclient/v1/orders.py b/barbicanclient/v1/orders.py
index aee762a..6b352c9 100644
--- a/barbicanclient/v1/orders.py
+++ b/barbicanclient/v1/orders.py
@@ -17,7 +17,6 @@ import functools
 import logging
 
 from oslo_utils.timeutils import parse_isotime
-import six
 
 from barbicanclient import base
 from barbicanclient import formatter
@@ -113,8 +112,7 @@ class CertificateOrderFormatter(formatter.EntityFormatter):
         return data
 
 
-@six.add_metaclass(abc.ABCMeta)
-class Order(object):
+class Order(object, metaclass=abc.ABCMeta):
     """Base order object to hold common functionality
 
     This should be considered an abstract class that should not be
diff --git a/barbicanclient/v1/secrets.py b/barbicanclient/v1/secrets.py
index f4bc7ad..4a57860 100644
--- a/barbicanclient/v1/secrets.py
+++ b/barbicanclient/v1/secrets.py
@@ -17,7 +17,6 @@ import functools
 import logging
 
 from oslo_utils.timeutils import parse_isotime
-import six
 
 from barbicanclient import base
 from barbicanclient import exceptions
@@ -293,7 +292,7 @@ class Secret(SecretFormatter):
         }
 
         if self.payload is not None:
-            if not isinstance(self.payload, (six.text_type, six.binary_type)):
+            if not isinstance(self.payload, (str, bytes)):
                 raise exceptions.PayloadException("Invalid Payload Type")
 
             if not len(self.payload):
@@ -307,7 +306,7 @@ class Secret(SecretFormatter):
             for backwards compatibility and should be removed in a future
             release.
             '''
-            if type(self.payload) is six.binary_type:
+            if type(self.payload) is bytes:
                 secret_dict['payload'] = self.payload.decode('utf-8')
             else:
                 secret_dict['payload'] = self.payload
@@ -315,9 +314,9 @@ class Secret(SecretFormatter):
             secret_dict['payload_content_encoding'] = (
                 self.payload_content_encoding
             )
-        elif type(self.payload) is six.binary_type:
+        elif type(self.payload) is bytes:
             '''
-            six.binary_type is stored as application/octet-stream
+            bytes is stored as application/octet-stream
             and it is base64 encoded for a one-step POST
             '''
             secret_dict['payload'] = (
@@ -325,9 +324,9 @@ class Secret(SecretFormatter):
             ).decode('UTF-8')
             secret_dict['payload_content_type'] = u'application/octet-stream'
             secret_dict['payload_content_encoding'] = u'base64'
-        elif type(self.payload) is six.text_type:
+        elif type(self.payload) is str:
             '''
-            six.text_type is stored as text/plain
+            str is stored as text/plain
             '''
             secret_dict['payload'] = self.payload
             secret_dict['payload_content_type'] = u'text/plain'
@@ -350,9 +349,9 @@ class Secret(SecretFormatter):
         if not self.secret_ref:
             raise LookupError("Secret is not yet stored.")
 
-        if type(self.payload) is six.binary_type:
+        if type(self.payload) is bytes:
             headers = {'content-type': "application/octet-stream"}
-        elif type(self.payload) is six.text_type:
+        elif type(self.payload) is str:
             headers = {'content-type': "text/plain"}
         else:
             raise exceptions.PayloadException("Invalid Payload Type")
@@ -479,9 +478,9 @@ class SecretManager(base.BaseEntityManager):
         if not secret_ref:
             raise ValueError('secret_ref is required.')
 
-        if type(payload) is six.binary_type:
+        if type(payload) is bytes:
             headers = {'content-type': "application/octet-stream"}
-        elif type(payload) is six.text_type:
+        elif type(payload) is str:
             headers = {'content-type': "text/plain"}
         else:
             raise exceptions.PayloadException("Invalid Payload Type")
diff --git a/doc/source/cli/usage.rst b/doc/source/cli/usage.rst
index 418f78b..dbbad60 100644
--- a/doc/source/cli/usage.rst
+++ b/doc/source/cli/usage.rst
@@ -78,13 +78,13 @@ correct Content Type based on the type of the data that is set on the
 `Secret.payload` property.  The following table summarizes the mapping of
 Python types to Barbican Secret Content Types:
 
-+-----------------+---------------+---------------+--------------------------+
-| six Type        | Python 2 Type | Python 3 Type | Barbican Content Type    |
-+=================+===============+===============+==========================+
-| six.binary_type | str           | bytes         | application/octet-stream |
-+-----------------+---------------+---------------+--------------------------+
-| six.text_type   | unicode       | str           | text/plain               |
-+-----------------+---------------+---------------+--------------------------+
++---------------+--------------------------+
+| Python 3 Type | Barbican Content Type    |
++===============+==========================+
+| bytes         | application/octet-stream |
++---------------+--------------------------+
+| str           | text/plain               |
++---------------+--------------------------+
 
 .. WARNING::
    Previous versions of python-barbicanclient allowed the user to set the
diff --git a/functionaltests/cli/v1/behaviors/base_behaviors.py b/functionaltests/cli/v1/behaviors/base_behaviors.py
index 3420cee..aef9831 100644
--- a/functionaltests/cli/v1/behaviors/base_behaviors.py
+++ b/functionaltests/cli/v1/behaviors/base_behaviors.py
@@ -13,9 +13,9 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 """
+import io
 import logging
 import re
-import six
 
 from barbicanclient import barbican
 from functionaltests.common import config
@@ -84,8 +84,8 @@ class BaseBehaviors(object):
         """
 
         try:
-            self.cmdline_client.stdout = six.StringIO()
-            self.cmdline_client.stderr = six.StringIO()
+            self.cmdline_client.stdout = io.StringIO()
+            self.cmdline_client.stderr = io.StringIO()
             self.cmdline_client.run(argv)
         except SystemExit:
             pass
diff --git a/functionaltests/utils.py b/functionaltests/utils.py
index 367dee0..5c5b51a 100644
--- a/functionaltests/utils.py
+++ b/functionaltests/utils.py
@@ -19,8 +19,7 @@ import time
 import types
 
 import oslotest.base as oslotest
-import six
-import six.moves.urllib.parse as urlparse
+import urllib.parse as urlparse
 
 
 class BaseTestCase(oslotest.BaseTestCase):
@@ -43,10 +42,10 @@ def construct_new_test_function(original_func, name, build_params):
     :return: A new function object
     """
     new_func = types.FunctionType(
-        six.get_function_code(original_func),
-        six.get_function_globals(original_func),
+        original_func.__code__,
+        original_func.__globals__,
         name=name,
-        argdefs=six.get_function_defaults(original_func)
+        argdefs=original_func.__defaults__
     )
 
     # Support either an arg list or kwarg dict for our data
diff --git a/requirements.txt b/requirements.txt
index 1ce91a6..9c37a45 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,6 @@
 # process, which may cause wedges in the gate later.
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 requests>=2.14.2 # Apache-2.0
-six>=1.10.0 # MIT
 cliff!=2.9.0,>=2.8.0 # Apache-2.0
 keystoneauth1>=3.4.0 # Apache-2.0
 oslo.i18n>=3.15.3 # Apache-2.0