Using dict.items() is better than six.iteritems(dict)

Replacing dict.iteritems()/.itervalues() with
six.iteritems(dict)/six.itervalues(dict) was preferred in the past,
but there was a discussion suggesting to avoid six for this[1].
The overhead of creating a temporary list on Python 2 is negligible.

[1]http://lists.openstack.org/pipermail/openstack-dev/2015-June/066391.html
Partially-implements blueprint py3-compatibility

Change-Id: Ia2298733188b3d964d43a547504ede2ebeaba9bd

manila/api/common.py

@@ -18,7 +18,6 @@ import re
 
 from oslo_config import cfg
 from oslo_log import log
-import six
 from six.moves.urllib import parse
 import webob
 
@@ -193,7 +192,7 @@ def dict_to_query_str(params):
     # TODO(throughnothing): we should just use urllib.urlencode instead of this
     # But currently we don't work with urlencoded url's
     param_str = ""
-    for key, val in six.iteritems(params):
+    for key, val in params.items():
         param_str = param_str + '='.join([str(key), str(val)]) + '&'
 
     return param_str.rstrip('&')

manila/api/extensions.py

@@ -96,7 +96,7 @@ class ExtensionsResource(wsgi.Resource):
 
     def index(self, req):
         extensions = []
-        for _alias, ext in six.iteritems(self.extension_manager.extensions):
+        for _alias, ext in self.extension_manager.extensions.items():
             extensions.append(self._translate(ext))
         return dict(extensions=extensions)
 

manila/api/v1/security_service.py

@@ -16,7 +16,6 @@
 """The security service api."""
 
 from oslo_log import log
-import six
 import webob
 from webob import exc
 
@@ -124,7 +123,7 @@ class SecurityServiceController(wsgi.Controller):
             not_found = object()
             for ss in security_services:
                 if all(ss.get(opt, not_found) == value for opt, value in
-                       six.iteritems(search_opts)):
+                       search_opts.items()):
                     results.append(ss)
             security_services = results
 

manila/api/v1/share_networks.py

@@ -164,7 +164,7 @@ class ShareNetworkController(wsgi.Controller):
         for opt in opts_to_remove:
             search_opts.pop(opt, None)
         if search_opts:
-            for key, value in six.iteritems(search_opts):
+            for key, value in search_opts.items():
                 if key in ['ip_version', 'segmentation_id']:
                     value = int(value)
                 networks = [network for network in networks
@@ -284,7 +284,7 @@ class ShareNetworkController(wsgi.Controller):
             'add_security_service': self._add_security_service,
             'remove_security_service': self._remove_security_service
         }
-        for action, data in six.iteritems(body):
+        for action, data in body.items():
             try:
                 return _actions[action](req, id, data)
             except KeyError:

manila/api/v1/share_servers.py

@@ -55,7 +55,7 @@ class ShareServerController(wsgi.Controller):
             else:
                 s.share_network_name = s.share_network_id
         if search_opts:
-            for k, v in six.iteritems(search_opts):
+            for k, v in search_opts.items():
                 share_servers = [s for s in share_servers if
                                  (hasattr(s, k) and
                                   s[k] == v or k == 'share_network' and

manila/api/v1/share_snapshots.py

@@ -16,7 +16,6 @@
 """The share snapshots api."""
 
 from oslo_log import log
-import six
 import webob
 from webob import exc
 
@@ -208,7 +207,7 @@ class ShareSnapshotsController(wsgi.Controller, wsgi.AdminActionsMixin):
             snapshot.get('display_name'),
             snapshot.get('display_description'))
         return self._view_builder.detail(
-            req, dict(six.iteritems(new_snapshot)))
+            req, dict(new_snapshot.items()))
 
 
 def create_resource():

manila/api/v1/share_types_extra_specs.py

@@ -33,7 +33,7 @@ class ShareTypeExtraSpecsController(wsgi.Controller):
     def _get_extra_specs(self, context, type_id):
         extra_specs = db.share_type_extra_specs_get(context, type_id)
         specs_dict = {}
-        for key, value in six.iteritems(extra_specs):
+        for key, value in extra_specs.items():
             specs_dict[key] = value
         return dict(extra_specs=specs_dict)
 
@@ -62,7 +62,7 @@ class ShareTypeExtraSpecsController(wsgi.Controller):
                     and valid_type
                     and valid_required_extra_spec)
 
-        for k, v in six.iteritems(extra_specs):
+        for k, v in extra_specs.items():
             if is_valid_string(k) and isinstance(v, dict):
                 self._verify_extra_specs(v)
             elif not is_valid_extra_spec(k, v):

manila/api/v1/shares.py

@@ -324,7 +324,7 @@ class ShareMixin(object):
                                           display_description,
                                           **kwargs)
 
-        return self._view_builder.detail(req, dict(six.iteritems(new_share)))
+        return self._view_builder.detail(req, dict(new_share.items()))
 
     @staticmethod
     def _validate_common_name(access):

manila/api/v2/cgsnapshots.py

@@ -179,8 +179,7 @@ class CGSnapshotController(wsgi.Controller, wsgi.AdminActionsMixin):
         except exception.InvalidConsistencyGroup as e:
             raise exc.HTTPConflict(explanation=six.text_type(e))
 
-        return self._view_builder.detail(req, dict(six.iteritems(
+        return self._view_builder.detail(req, dict(new_snapshot.items()))
-                                         new_snapshot)))
 
     @wsgi.Controller.api_version('2.4', experimental=True)
     @wsgi.Controller.authorize('get_cgsnapshot')

manila/api/v2/consistency_groups.py

@@ -213,7 +213,7 @@ class CGController(wsgi.Controller, wsgi.AdminActionsMixin):
         except (exception.CGSnapshotNotFound, exception.InvalidInput) as e:
             raise exc.HTTPBadRequest(explanation=six.text_type(e))
 
-        return self._view_builder.detail(req, dict(six.iteritems(new_cg)))
+        return self._view_builder.detail(req, dict(new_cg.items()))
 
     def _update(self, *args, **kwargs):
         db.consistency_group_update(*args, **kwargs)

manila/cmd/manage.py

@@ -64,7 +64,6 @@ i18n.enable_lazy()
 from oslo_config import cfg
 from oslo_log import log
 from oslo_utils import uuidutils
-import six
 
 from manila.common import config  # Need to register global_opts  # noqa
 from manila import context
@@ -256,7 +255,7 @@ class ConfigCommands(object):
     """Class for exposing the flags defined by flag_file(s)."""
 
     def list(self):
-        for key, value in six.iteritems(CONF):
+        for key, value in CONF.items():
             if value is not None:
                 print('%s = %s' % (key, value))
 

manila/db/sqlalchemy/api.py

@@ -1292,7 +1292,7 @@ def _share_get_query(context, session=None):
 def _metadata_refs(metadata_dict, meta_class):
     metadata_refs = []
     if metadata_dict:
-        for k, v in six.iteritems(metadata_dict):
+        for k, v in metadata_dict.items():
             value = six.text_type(v) if isinstance(v, bool) else v
 
             metadata_ref = meta_class()
@@ -1978,7 +1978,7 @@ def _share_metadata_update(context, share_id, metadata, delete, session=None):
         if delete:
             original_metadata = _share_metadata_get(context, share_id,
                                                     session=session)
-            for meta_key, meta_value in six.iteritems(original_metadata):
+            for meta_key, meta_value in original_metadata.items():
                 if meta_key not in metadata:
                     meta_ref = _share_metadata_get_item(context, share_id,
                                                         meta_key,
@@ -2900,7 +2900,7 @@ def share_type_extra_specs_update_or_create(context, share_type_id, specs):
     session = get_session()
     with session.begin():
         spec_ref = None
-        for key, value in six.iteritems(specs):
+        for key, value in specs.items():
             try:
                 spec_ref = _share_type_extra_specs_get_item(
                     context, share_type_id, key, session)

manila/db/sqlalchemy/models.py

@@ -22,7 +22,6 @@ SQLAlchemy models for Manila data.
 from oslo_config import cfg
 from oslo_db.sqlalchemy import models
 from oslo_log import log
-import six
 from sqlalchemy import Column, Integer, String, schema
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy import orm
@@ -45,7 +44,7 @@ class ManilaBase(models.ModelBase,
 
     def to_dict(self):
         model_dict = {}
-        for k, v in six.iteritems(self):
+        for k, v in self.items():
             if not issubclass(type(v), ManilaBase):
                 model_dict[k] = v
         return model_dict

manila/exception.py

@@ -81,7 +81,7 @@ class ManilaException(Exception):
                 self.kwargs['code'] = self.code
             except AttributeError:
                 pass
-        for k, v in six.iteritems(self.kwargs):
+        for k, v in self.kwargs.items():
             if isinstance(v, Exception):
                 self.kwargs[k] = six.text_type(v)
 
@@ -93,7 +93,7 @@ class ManilaException(Exception):
                 # kwargs doesn't match a variable in the message
                 # log the issue and the kwargs
                 LOG.exception(_LE('Exception in string format operation.'))
-                for name, value in six.iteritems(kwargs):
+                for name, value in kwargs.items():
                     LOG.error(_LE("%(name)s: %(value)s"), {
                         'name': name, 'value': value})
                 if CONF.fatal_exception_format_errors:

manila/quota.py

@@ -237,7 +237,7 @@ class DbQuotaDriver(object):
                                                            project_id, user_id)
         # Use the project quota for default user quota.
         proj_quotas = db.quota_get_all_by_project(context, project_id)
-        for key, value in six.iteritems(proj_quotas):
+        for key, value in proj_quotas.items():
             if key not in user_quotas.keys():
                 user_quotas[key] = value
         user_usages = None

manila/scheduler/filters/capabilities.py

@@ -15,8 +15,6 @@
 
 import logging
 
-import six
-
 from manila.scheduler.filters import base_host
 from manila.scheduler.filters import extra_specs_ops
 
@@ -36,7 +34,7 @@ class CapabilitiesFilter(base_host.BaseHostFilter):
         if not extra_specs:
             return True
 
-        for key, req in six.iteritems(extra_specs):
+        for key, req in extra_specs.items():
 
             # Either not scoped format, or in capabilities scope
             scope = key.split(':')

manila/scheduler/host_manager.py

@@ -505,12 +505,12 @@ class HostManager(object):
                 host_state = self.host_state_cls(
                     host,
                     capabilities=capabilities,
-                    service=dict(six.iteritems(service)))
+                    service=dict(service.items()))
                 self.host_state_map[host] = host_state
 
             # Update capabilities and attributes in host_state
             host_state.update_from_share_capability(
-                capabilities, service=dict(six.iteritems(service)))
+                capabilities, service=dict(service.items()))
 
     def get_all_host_states_share(self, context):
         """Returns a dict of all the hosts the HostManager knows about.
@@ -579,7 +579,7 @@ class HostManager(object):
         if not filter_dict:
             return True
 
-        for filter_key, filter_value in six.iteritems(filter_dict):
+        for filter_key, filter_value in filter_dict.items():
             if filter_key not in dict_to_check:
                 return False
             if not re.match(filter_value, dict_to_check.get(filter_key)):

manila/share/api.py

@@ -715,7 +715,7 @@ class API(base.Base):
     def get_snapshot(self, context, snapshot_id):
         policy.check_policy(context, 'share_snapshot', 'get_snapshot')
         rv = self.db.share_snapshot_get(context, snapshot_id)
-        return dict(six.iteritems(rv))
+        return dict(rv.items())
 
     def get_all_snapshots(self, context, search_opts=None,
                           sort_key='share_id', sort_dir='desc'):
@@ -751,7 +751,7 @@ class API(base.Base):
             results = []
             not_found = object()
             for snapshot in snapshots:
-                for opt, value in six.iteritems(search_opts):
+                for opt, value in search_opts.items():
                     if snapshot.get(opt, not_found) != value:
                         break
                 else:
@@ -872,7 +872,7 @@ class API(base.Base):
     def get_share_metadata(self, context, share):
         """Get all metadata associated with a share."""
         rv = self.db.share_metadata_get(context, share['id'])
-        return dict(six.iteritems(rv))
+        return dict(rv.items())
 
     @policy.wrap_check_policy('share')
     def delete_share_metadata(self, context, share, key):
@@ -893,7 +893,7 @@ class API(base.Base):
         if not metadata:
             metadata = {}
 
-        for k, v in six.iteritems(metadata):
+        for k, v in metadata.items():
             if not k:
                 msg = _("Metadata property key is blank.")
                 LOG.warning(msg)

manila/share/drivers/ganesha/manager.py

@@ -128,7 +128,7 @@ def _conf2json(conf):
 def _dump_to_conf(confdict, out=sys.stdout, indent=0):
     """Output confdict in Ganesha config format."""
     if isinstance(confdict, dict):
-        for k, v in six.iteritems(confdict):
+        for k, v in confdict.items():
             if v is None:
                 continue
             out.write(' ' * (indent * IWIDTH) + k + ' ')

manila/share/drivers/ganesha/utils.py

@@ -17,7 +17,6 @@ import os
 import pipes
 
 from oslo_concurrency import processutils
-import six
 
 from manila import utils
 
@@ -25,7 +24,7 @@ from manila import utils
 def patch(base, *overlays):
     """Recursive dictionary patching."""
     for ovl in overlays:
-        for k, v in six.iteritems(ovl):
+        for k, v in ovl.items():
             if isinstance(v, dict) and isinstance(base.get(k), dict):
                 patch(base[k], v)
             else:
@@ -35,7 +34,7 @@ def patch(base, *overlays):
 
 def walk(dct):
     """Recursive iteration over dictionary."""
-    for k, v in six.iteritems(dct):
+    for k, v in dct.items():
         if isinstance(v, dict):
             for w in walk(v):
                 yield w

manila/share/drivers/glusterfs/common.py

@@ -91,7 +91,7 @@ class GlusterManager(object):
 
         self.components = (address if isinstance(address, dict) else
                            self.parse(address))
-        for k, v in six.iteritems(requires):
+        for k, v in requires.items():
             if v is None:
                 continue
             if (self.components.get(k) is not None) != v:

manila/share/drivers/glusterfs/layout_volume.py

@@ -109,7 +109,7 @@ class GlusterfsVolumeMappedLayout(layout.GlusterfsShareLayoutBase):
         """
 
         subdict = {}
-        for key, val in six.iteritems(PATTERN_DICT):
+        for key, val in PATTERN_DICT.items():
             subdict[key] = val['pattern']
 
         # Using templates with placeholder syntax #{<var>}
@@ -131,7 +131,7 @@ class GlusterfsVolumeMappedLayout(layout.GlusterfsShareLayoutBase):
             except exception.GlusterfsException as exc:
                 exceptions[srvaddr] = six.text_type(exc)
         if exceptions:
-            for srvaddr, excmsg in six.iteritems(exceptions):
+            for srvaddr, excmsg in exceptions.items():
                 LOG.error(_LE("'gluster version' failed on server "
                               "%(server)s with: %(message)s"),
                           {'server': srvaddr, 'message': excmsg})
@@ -139,7 +139,7 @@ class GlusterfsVolumeMappedLayout(layout.GlusterfsShareLayoutBase):
                 "'gluster version' failed on servers %s") % (
                 ','.join(exceptions.keys())))
         notsupp_servers = []
-        for srvaddr, vers in six.iteritems(glusterfs_versions):
+        for srvaddr, vers in glusterfs_versions.items():
             if common.GlusterManager.numreduct(
                vers) < self.driver.GLUSTERFS_VERSION_MIN:
                 notsupp_servers.append(srvaddr)

manila/share/drivers/netapp/dataontap/cluster_mode/lib_base.py

@@ -1020,9 +1020,9 @@ class NetAppCmodeFileStorageLibrary(object):
             return
 
         raid_types = self._client.get_aggregate_raid_types(aggregate_names)
-        for aggregate_name, raid_type in six.iteritems(raid_types):
+        for aggregate_name, raid_type in raid_types.items():
             ssc_stats[aggregate_name]['netapp_raid_type'] = raid_type
 
         disk_types = self._client.get_aggregate_disk_types(aggregate_names)
-        for aggregate_name, disk_type in six.iteritems(disk_types):
+        for aggregate_name, disk_type in disk_types.items():
             ssc_stats[aggregate_name]['netapp_disk_type'] = disk_type

manila/share/manager.py

@@ -873,7 +873,7 @@ class ShareManager(manager.SchedulerDependentManager):
 
     def _update_quota_usages(self, context, project_id, usages):
         user_id = context.user_id
-        for resource, usage in six.iteritems(usages):
+        for resource, usage in usages.items():
             try:
                 current_usage = self.db.quota_usage_get(
                     context, project_id, resource, user_id)

manila/share/share_types.py

@@ -82,7 +82,7 @@ def get_all_types(context, inactive=0, search_opts=None):
 
     share_types = db.share_type_get_all(context, inactive, filters=filters)
 
-    for type_name, type_args in six.iteritems(share_types):
+    for type_name, type_args in share_types.items():
         required_extra_specs = {}
         try:
             required_extra_specs = get_valid_required_extra_specs(
@@ -101,7 +101,7 @@ def get_all_types(context, inactive=0, search_opts=None):
         LOG.debug("Searching by: %s", search_opts)
 
         def _check_extra_specs_match(share_type, searchdict):
-            for k, v in six.iteritems(searchdict):
+            for k, v in searchdict.items():
                 if (k not in share_type['extra_specs'].keys()
                         or share_type['extra_specs'][k] != v):
                     return False
@@ -111,9 +111,9 @@ def get_all_types(context, inactive=0, search_opts=None):
         filter_mapping = {'extra_specs': _check_extra_specs_match}
 
         result = {}
-        for type_name, type_args in six.iteritems(share_types):
+        for type_name, type_args in share_types.items():
             # go over all filters in the list
-            for opt, values in six.iteritems(search_opts):
+            for opt, values in search_opts.items():
                 try:
                     filter_func = filter_mapping[opt]
                 except KeyError:
@@ -292,11 +292,11 @@ def share_types_diff(context, share_type_id1, share_type_id2):
             dict1 = {}
         if dict2 is None:
             dict2 = {}
-        for k, v in six.iteritems(dict1):
+        for k, v in dict1.items():
             res[k] = (v, dict2.get(k))
             if k not in dict2 or res[k][0] != res[k][1]:
                 equal = False
-        for k, v in six.iteritems(dict2):
+        for k, v in dict2.items():
             res[k] = (dict1.get(k), v)
             if k not in dict1 or res[k][0] != res[k][1]:
                 equal = False

manila/test.py

@@ -33,7 +33,6 @@ from oslo_config import fixture as config_fixture
 import oslo_i18n
 from oslo_messaging import conffixture as messaging_conffixture
 import oslotest.base as base_test
-import six
 
 from manila.db import migration
 from manila.db.sqlalchemy import api as db_api
@@ -171,7 +170,7 @@ class TestCase(base_test.BaseTestCase):
 
     def flags(self, **kw):
         """Override flag variables for a test."""
-        for k, v in six.iteritems(kw):
+        for k, v in kw.items():
             CONF.set_override(k, v)
 
     def start_service(self, name, host=None, **kwargs):

manila/tests/api/fakes.py

@@ -17,7 +17,6 @@ import uuid
 
 from oslo_utils import timeutils
 import routes
-import six
 import webob
 import webob.dec
 import webob.request
@@ -96,7 +95,7 @@ class FakeToken(object):
     def __init__(self, **kwargs):
         FakeToken.id_count += 1
         self.id = FakeToken.id_count
-        for k, v in six.iteritems(kwargs):
+        for k, v in kwargs.items():
             setattr(self, k, v)
 
 

manila/tests/api/v2/test_share_types.py

@@ -18,7 +18,6 @@ import datetime
 import ddt
 import mock
 from oslo_utils import timeutils
-import six
 import webob
 
 from manila.api.v2 import share_types as types
@@ -406,7 +405,7 @@ def fake_share_type_get_all(context, inactive=False, filters=None):
     if filters is None or filters.get('is_public', None) is None:
         return SHARE_TYPES
     res = {}
-    for k, v in six.iteritems(SHARE_TYPES):
+    for k, v in SHARE_TYPES.items():
         if filters['is_public'] and _has_type_access(k, context.project_id):
             res.update({k: v})
             continue

manila/tests/db/sqlalchemy/test_api.py

@@ -859,8 +859,8 @@ class ShareNetworkDatabaseAPITestCase(BaseDatabaseAPITestCase):
                                               self.share_nw_dict['id'])
 
         self.assertEqual(new_name, result_update['name'])
-        self._check_fields(expected=dict(six.iteritems(result_update)),
+        self._check_fields(expected=dict(result_update.items()),
-                           actual=dict(six.iteritems(result_get)))
+                           actual=dict(result_get.items()))
 
     def test_update_not_found(self):
         self.assertRaises(exception.ShareNetworkNotFound,

manila/tests/scheduler/fakes.py

@@ -17,7 +17,6 @@ Fakes For Scheduler tests.
 """
 
 from oslo_utils import timeutils
-import six
 
 from manila.scheduler.drivers import filter
 from manila.scheduler import host_manager
@@ -237,7 +236,7 @@ class FakeHostManager(host_manager.HostManager):
 class FakeHostState(host_manager.HostState):
     def __init__(self, host, attribute_dict):
         super(FakeHostState, self).__init__(host)
-        for (key, val) in six.iteritems(attribute_dict):
+        for (key, val) in attribute_dict.items():
             setattr(self, key, val)
 
 

manila/tests/share/drivers/glusterfs/test_layout_volume.py

@@ -23,7 +23,6 @@ import tempfile
 import ddt
 import mock
 from oslo_config import cfg
-import six
 
 from manila.common import constants
 from manila import context
@@ -185,7 +184,7 @@ class GlusterfsVolumeMappedLayoutTestCase(test.TestCase):
         self.mock_object(self._layout, '_glustermanager',
                          mock.Mock(side_effect=_glustermanager_calls))
         expected_output = {}
-        for q, d in six.iteritems(self.glusterfs_volumes_dict):
+        for q, d in self.glusterfs_volumes_dict.items():
             if sharemark[q] not in (FAKE_UUID1, FAKE_UUID2):
                 expected_output[q] = d
 

manila/tests/share/drivers/netapp/dataontap/cluster_mode/test_driver_interfaces.py

@@ -17,7 +17,6 @@ Mock unit tests for the NetApp file share driver interfaces
 
 
 import mock
-import six
 
 from manila.share.drivers.netapp.dataontap.cluster_mode import drv_multi_svm
 from manila.share.drivers.netapp.dataontap.cluster_mode import drv_single_svm
@@ -59,5 +58,5 @@ class NetAppFileStorageDriverInterfaceTestCase(test.TestCase):
 
     def _get_local_functions(self, obj):
         """Get function names of an object without superclass functions."""
-        return set([key for key, value in six.iteritems(type(obj).__dict__)
+        return set([key for key, value in type(obj).__dict__.items()
                     if callable(value)])

manila/tests/share/drivers/netapp/test_common.py

@@ -116,7 +116,7 @@ class NetAppDriverFactoryTestCase(test.TestCase):
         registry = na_common.NETAPP_UNIFIED_DRIVER_REGISTRY
 
         for family in six.iterkeys(registry):
-            for mode, full_class_name in six.iteritems(registry[family]):
+            for mode, full_class_name in registry[family].items():
 
                 config = na_fakes.create_configuration()
                 config.local_conf.set_override('driver_handles_share_servers',

manila/tests/share/test_rpcapi.py

@@ -20,7 +20,6 @@ import copy
 
 from oslo_config import cfg
 from oslo_serialization import jsonutils
-import six
 
 from manila.common import constants
 from manila import context
@@ -132,7 +131,7 @@ class ShareRpcAPITestCase(test.TestCase):
         for arg, expected_arg in zip(self.fake_args, expected_args):
             self.assertEqual(expected_arg, arg)
 
-        for kwarg, value in six.iteritems(self.fake_kwargs):
+        for kwarg, value in self.fake_kwargs.items():
             self.assertEqual(expected_msg[kwarg], value)
 
     def test_create_share_instance(self):

manila/tests/test_wsgi.py

@@ -273,7 +273,7 @@ class ExceptionTest(test.TestCase):
         self.assertEqual(exception_type.code, resp.status_int, resp.body)
 
         if hasattr(exception_type, 'headers'):
-            for (key, value) in six.iteritems(exception_type.headers):
+            for (key, value) in exception_type.headers.items():
                 self.assertTrue(key in resp.headers)
                 self.assertEqual(value, resp.headers[key])
 

manila/wsgi.py

@@ -35,7 +35,6 @@ from oslo_service import service
 from oslo_utils import excutils
 from paste import deploy
 import routes.middleware
-import six
 import webob.dec
 import webob.exc
 
@@ -440,7 +439,7 @@ class Debug(Middleware):
         resp = req.get_response(self.application)
 
         print(('*' * 40) + ' RESPONSE HEADERS')
-        for (key, value) in six.iteritems(resp.headers):
+        for (key, value) in resp.headers.items():
             print(key, '=', value)
         print()