diff --git a/nova/db/sqlalchemy/api.py b/nova/db/sqlalchemy/api.py
index d27c8f291e3e..0719ff5c703b 100644
--- a/nova/db/sqlalchemy/api.py
+++ b/nova/db/sqlalchemy/api.py
@@ -2158,7 +2158,7 @@ def _regex_instance_filter(query, filters):
 
     model = models.Instance
     db_regexp_op = _get_regexp_op_for_connection(CONF.database.connection)
-    for filter_name in filters.iterkeys():
+    for filter_name in filters:
         try:
             column_attr = getattr(model, filter_name)
         except AttributeError:
diff --git a/nova/test.py b/nova/test.py
index d2e0256065f0..5be7925d87ab 100644
--- a/nova/test.py
+++ b/nova/test.py
@@ -292,8 +292,8 @@ class TestCase(testtools.TestCase):
         def inner(expected, observed):
             if isinstance(expected, dict) and isinstance(observed, dict):
                 self.assertEqual(len(expected), len(observed))
-                expected_keys = sorted(expected.iterkeys())
-                observed_keys = sorted(expected.iterkeys())
+                expected_keys = sorted(expected)
+                observed_keys = sorted(expected)
                 self.assertEqual(expected_keys, observed_keys)
 
                 expected_values_iter = iter(sort(expected.values()))
diff --git a/nova/tests/functional/test_servers.py b/nova/tests/functional/test_servers.py
index 35af76c18230..26be77b75d17 100644
--- a/nova/tests/functional/test_servers.py
+++ b/nova/tests/functional/test_servers.py
@@ -465,7 +465,7 @@ class ServersTest(ServersTestBase):
 
         # Cleanup
         self._delete_server(created_server_id)
-        for server_id in server_map.iterkeys():
+        for server_id in server_map:
             self._delete_server(server_id)
 
     def test_create_server_with_injected_files(self):
diff --git a/nova/tests/unit/api/openstack/compute/contrib/test_networks.py b/nova/tests/unit/api/openstack/compute/contrib/test_networks.py
index 5e7b6ffcde25..66304ad7b92f 100644
--- a/nova/tests/unit/api/openstack/compute/contrib/test_networks.py
+++ b/nova/tests/unit/api/openstack/compute/contrib/test_networks.py
@@ -223,7 +223,7 @@ class FakeNetworkAPI(object):
             net['broadcast'] = str(subnet_v4.broadcast)
             net['dhcp_start'] = str(subnet_v4[2])
 
-            for key in FAKE_NETWORKS[0].iterkeys():
+            for key in FAKE_NETWORKS[0]:
                 net.setdefault(key, kwargs.get(key))
             new_networks.append(net)
         self.networks += new_networks
diff --git a/tools/colorizer.py b/tools/colorizer.py
index 5f97e1979ee0..d1220f705d52 100755
--- a/tools/colorizer.py
+++ b/tools/colorizer.py
@@ -268,7 +268,7 @@ class NovaTestResult(testtools.TestResult):
         self.stopTestRun()
 
     def stopTestRun(self):
-        for cls in list(self.results.iterkeys()):
+        for cls in list(self.results):
             self.writeTestCase(cls)
         self.stream.writeln()
         self.writeSlowTests()