diff --git a/tools/check_logs.py b/tools/check_logs.py
index f82b387..fc21f75 100755
--- a/tools/check_logs.py
+++ b/tools/check_logs.py
@@ -25,7 +25,6 @@
 import six.moves.urllib.request as urlreq
 import yaml
 
-
 # DEVSTACK_GATE_GRENADE is either unset if grenade is not running
 # or a string describing what type of grenade run to perform.
 is_grenade = os.environ.get('DEVSTACK_GATE_GRENADE') is not None
@@ -137,7 +136,7 @@
     with open(WHITELIST_FILE) as stream:
         loaded = yaml.safe_load(stream)
         if loaded:
-            for (name, l) in loaded.iteritems():
+            for (name, l) in six.iteritems(loaded):
                 for w in l:
                     assert 'module' in w, 'no module in %s' % name
                     assert 'message' in w, 'no message in %s' % name
diff --git a/tools/find_stack_traces.py b/tools/find_stack_traces.py
index 2ba8b16..1f2b88b 100755
--- a/tools/find_stack_traces.py
+++ b/tools/find_stack_traces.py
@@ -126,8 +126,8 @@
 
 
 def print_stats(items, fname, verbose=False):
-    errors = len(filter(lambda x: x.level == "ERROR", items))
-    traces = len(filter(lambda x: x.level == "TRACE", items))
+    errors = len([x for x in items if x.level == "ERROR"])
+    traces = len([x for x in items if x.level == "TRACE"])
     print("%d ERRORS found in %s" % (errors, fname))
     print("%d TRACES found in %s" % (traces, fname))
 
diff --git a/tools/generate-tempest-plugins-list.py b/tools/generate-tempest-plugins-list.py
index acb29af..8d26c25 100644
--- a/tools/generate-tempest-plugins-list.py
+++ b/tools/generate-tempest-plugins-list.py
@@ -65,7 +65,7 @@
 # json library won't choke.
 projects = sorted(filter(is_in_openstack_namespace, json.loads(r.text[4:])))
 
-found_plugins = filter(has_tempest_plugin, projects)
+found_plugins = list(filter(has_tempest_plugin, projects))
 
 # Every element of the found_plugins list begins with "openstack/".
 # We drop those initial 10 octets when printing the list.