Drop use of six

Change-Id: I53005107bf4c05809182dc3865c5dc72c77b1054
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

lower-constraints.txt

@@ -38,7 +38,6 @@ PyYAML==3.12
 requests==2.14.2
 requestsexceptions==1.2.0
 rfc3986==0.3.1
-six==1.10.0
 smmap==0.9.0
 statsd==3.2.1
 stestr==2.0.0

oslo_middleware/base.py

@@ -15,18 +15,12 @@
 
 """Base class(es) for WSGI Middleware."""
 
-import six
+from inspect import getfullargspec
-
 from oslo_config import cfg
 import webob.dec
 import webob.request
 import webob.response
 
-if six.PY2:
-    from inspect import getargspec as getfullargspec
-else:
-    from inspect import getfullargspec
-
 
 class NoContentTypeResponse(webob.response.Response):
 

oslo_middleware/cors.py

@@ -18,7 +18,6 @@ import logging
 import debtcollector
 from oslo_config import cfg
 from oslo_middleware import base
-import six
 import webob.exc
 
 
@@ -209,7 +208,7 @@ class CORS(base.ConfigurableMiddleware):
 
         # NOTE(dims): Support older code that still passes in
         # a string for allowed_origin instead of a list
-        if isinstance(allowed_origin, six.string_types):
+        if isinstance(allowed_origin, str):
             # TODO(krotscheck): https://review.opendev.org/#/c/312687/
             LOG.warning('DEPRECATED: The `allowed_origin` keyword argument in '
                         '`add_origin()` should be a list, found String.')

oslo_middleware/healthcheck/__init__.py

@@ -15,6 +15,7 @@
 
 import collections
 import gc
+import io
 import json
 import platform
 import socket
@@ -26,7 +27,6 @@ import jinja2
 from oslo_utils import reflection
 from oslo_utils import strutils
 from oslo_utils import timeutils
-import six
 import stevedore
 import webob.dec
 import webob.exc
@@ -395,7 +395,7 @@ Reason
             ('text/html', self._make_html_response),
             ('application/json', self._make_json_response),
         ])
-        self._accept_order = tuple(six.iterkeys(self._accept_to_functor))
+        self._accept_order = tuple(self._accept_to_functor)
         # When no accept type matches instead of returning 406 we will
         # always return text/plain (because sending an error from this
         # middleware actually can cause issues).
@@ -437,8 +437,8 @@ Reason
         except AttributeError:
             pass
         else:
-            buf = six.StringIO()
+            buf = io.StringIO()
-            for stack in six.itervalues(active_frames):
+            for stack in active_frames.values():
                 traceback.print_stack(stack, file=buf)
                 threadstacks.append(buf.getvalue())
                 buf.seek(0)
@@ -449,7 +449,7 @@ Reason
     def _get_greenstacks():
         greenstacks = []
         if greenlet is not None:
-            buf = six.StringIO()
+            buf = io.StringIO()
             for gt in _find_objects(greenlet.greenlet):
                 traceback.print_stack(gt.gr_frame, file=buf)
                 greenstacks.append(buf.getvalue())

oslo_middleware/healthcheck/__main__.py

@@ -12,15 +12,15 @@
 #    under the License.
 
 import argparse
+from http import server
+import socketserver
 
-from six.moves import SimpleHTTPServer  # noqa
-from six.moves import socketserver
 import webob
 
 from oslo_middleware import healthcheck
 
 
-class HttpHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
+class HttpHandler(server.SimpleHTTPRequestHandler):
     def do_GET(self):
         @webob.dec.wsgify
         def dummy_application(req):

oslo_middleware/healthcheck/pluginbase.py

@@ -15,8 +15,6 @@
 
 import abc
 
-import six
-
 
 class HealthcheckResult(object):
     """Result of a ``healthcheck`` method call should be this object."""
@@ -27,8 +25,7 @@ class HealthcheckResult(object):
         self.details = details
 
 
-@six.add_metaclass(abc.ABCMeta)
+class HealthcheckBaseExtension(metaclass=abc.ABCMeta):
-class HealthcheckBaseExtension(object):
 
     def __init__(self, oslo_conf, conf):
         self.oslo_conf = oslo_conf

oslo_middleware/tests/test_sizelimit.py

@@ -12,9 +12,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import io
+
 from oslo_config import fixture as config
 from oslotest import base as test_base
-import six
 import webob
 
 from oslo_middleware import sizelimit
@@ -25,14 +26,14 @@ class TestLimitingReader(test_base.BaseTestCase):
     def test_limiting_reader(self):
         BYTES = 1024
         bytes_read = 0
-        data = six.StringIO("*" * BYTES)
+        data = io.StringIO("*" * BYTES)
         for chunk in sizelimit.LimitingReader(data, BYTES):
             bytes_read += len(chunk)
 
         self.assertEqual(BYTES, bytes_read)
 
         bytes_read = 0
-        data = six.StringIO("*" * BYTES)
+        data = io.StringIO("*" * BYTES)
         reader = sizelimit.LimitingReader(data, BYTES)
         byte = reader.read(1)
         while len(byte) != 0:
@@ -44,7 +45,7 @@ class TestLimitingReader(test_base.BaseTestCase):
     def test_read_default_value(self):
         BYTES = 1024
         data_str = "*" * BYTES
-        data = six.StringIO(data_str)
+        data = io.StringIO(data_str)
         reader = sizelimit.LimitingReader(data, BYTES)
         res = reader.read()
         self.assertEqual(data_str, res)
@@ -54,7 +55,7 @@ class TestLimitingReader(test_base.BaseTestCase):
 
         def _consume_all_iter():
             bytes_read = 0
-            data = six.StringIO("*" * BYTES)
+            data = io.StringIO("*" * BYTES)
             for chunk in sizelimit.LimitingReader(data, BYTES - 1):
                 bytes_read += len(chunk)
 
@@ -63,7 +64,7 @@ class TestLimitingReader(test_base.BaseTestCase):
 
         def _consume_all_read():
             bytes_read = 0
-            data = six.StringIO("*" * BYTES)
+            data = io.StringIO("*" * BYTES)
             reader = sizelimit.LimitingReader(data, BYTES - 1)
             byte = reader.read(1)
             while len(byte) != 0:

requirements.txt

@@ -8,7 +8,6 @@ oslo.config>=5.2.0 # Apache-2.0
 oslo.context>=2.19.2 # Apache-2.0
 oslo.i18n>=3.15.3 # Apache-2.0
 oslo.utils>=3.33.0 # Apache-2.0
-six>=1.10.0 # MIT
 stevedore>=1.20.0 # Apache-2.0
 WebOb>=1.8.0 # MIT
 debtcollector>=1.2.0 # Apache-2.0