diff --git a/tacker/api/extensions.py b/tacker/api/extensions.py
index eb879c55b..db23c38ac 100644
--- a/tacker/api/extensions.py
+++ b/tacker/api/extensions.py
@@ -166,7 +166,7 @@ class ExtensionDescriptor(object):
         if not extension_attrs_map:
             return
 
-        for resource, attrs in six.iteritems(extension_attrs_map):
+        for resource, attrs in extension_attrs_map.items():
             extended_attrs = extended_attributes.get(resource)
             if extended_attrs:
                 attrs.update(extended_attrs)
@@ -196,7 +196,7 @@ class ActionExtensionController(wsgi.Controller):
     def action(self, request, id):
         input_dict = self._deserialize(request.body,
                                        request.get_content_type())
-        for action_name, handler in six.iteritems(self.action_handlers):
+        for action_name, handler in (self.action_handlers).items():
             if action_name in input_dict:
                 return handler(input_dict, request, id)
         # no action handler found (bump to downstream application)
@@ -238,7 +238,7 @@ class ExtensionController(wsgi.Controller):
 
     def index(self, request):
         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)
 
@@ -279,7 +279,7 @@ class ExtensionMiddleware(wsgi.Middleware):
 
             LOG.debug(_('Extended resource: %s'),
                       resource.collection)
-            for action, method in six.iteritems(resource.collection_actions):
+            for action, method in (resource.collection_actions).items():
                 conditions = dict(method=[method])
                 path = "/%s/%s" % (resource.collection, action)
                 with mapper.submapper(controller=resource.controller,
@@ -479,8 +479,7 @@ class ExtensionManager(object):
                         continue
                 try:
                     extended_attrs = ext.get_extended_resources(version)
-                    for resource, resource_attrs in six.iteritems(
-                            extended_attrs):
+                    for resource, resource_attrs in extended_attrs.items():
                         if attr_map.get(resource):
                             attr_map[resource].update(resource_attrs)
                         else:
diff --git a/tacker/policy.py b/tacker/policy.py
index c60808ecf..fe43882f5 100644
--- a/tacker/policy.py
+++ b/tacker/policy.py
@@ -102,7 +102,7 @@ def _should_validate_sub_attributes(attribute, sub_attr):
     validate = attribute.get('validate')
     return (validate and isinstance(sub_attr, collections.Iterable) and
             any([k.startswith('type:dict') and
-                 v for (k, v) in six.iteritems(validate)]))
+                 v for (k, v) in validate.items()]))
 
 
 def _build_subattr_match_rule(attr_name, attr, action, target):
diff --git a/tacker/tests/unit/test_api_v2.py b/tacker/tests/unit/test_api_v2.py
index 9dff52dc3..1c485f97b 100644
--- a/tacker/tests/unit/test_api_v2.py
+++ b/tacker/tests/unit/test_api_v2.py
@@ -541,7 +541,7 @@ class JSONV2TestCase(APIv2TestBase, testlib_api.WebTestCase):
             output_dict = res['networks'][0]
             input_dict['shared'] = False
             self.assertEqual(len(input_dict), len(output_dict))
-            for k, v in six.iteritems(input_dict):
+            for k, v in input_dict.items():
                 self.assertEqual(v, output_dict[k])
         else:
             # expect no results
@@ -1125,8 +1125,7 @@ class SubresourceTest(base.BaseTestCase):
 
         # Save the global RESOURCE_ATTRIBUTE_MAP
         self.saved_attr_map = {}
-        for resource, attrs in six.iteritems(
-                attributes.RESOURCE_ATTRIBUTE_MAP):
+        for resource, attrs in (attributes.RESOURCE_ATTRIBUTE_MAP).items():
             self.saved_attr_map[resource] = attrs.copy()
 
         self.config_parse()
@@ -1294,8 +1293,7 @@ class ExtensionTestCase(base.BaseTestCase):
 
         # Save the global RESOURCE_ATTRIBUTE_MAP
         self.saved_attr_map = {}
-        for resource, attrs in six.iteritems(
-                attributes.RESOURCE_ATTRIBUTE_MAP):
+        for resource, attrs in (attributes.RESOURCE_ATTRIBUTE_MAP).items():
             self.saved_attr_map[resource] = attrs.copy()
 
         # Create the default configurations
diff --git a/tacker/wsgi.py b/tacker/wsgi.py
index c443d4f2a..cb7d1d026 100644
--- a/tacker/wsgi.py
+++ b/tacker/wsgi.py
@@ -654,7 +654,7 @@ 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()