Update hacking for Python3

The repo is Python 3 now, so update hacking to version 3.0 which
supports Python 3.

Fix problems found.

Change-Id: Ia621c3fea2b8ded8df7727c07931ad071a61e736

aodh/api/controllers/v2/alarm_rules/composite.py

@@ -116,4 +116,5 @@ class CompositeRule(wtypes.UserType):
     def __call__(**rule):
         return rule
 
+
 composite_rule = CompositeRule()

aodh/api/controllers/v2/query.py

@@ -100,7 +100,7 @@ class ValidatedComplexQuery(object):
         valid_fields = _list_to_regexp(valid_keys)
 
         if metadata_allowed:
-            valid_filter_fields = valid_fields + "|^metadata\.[\S]+$"
+            valid_filter_fields = valid_fields + r"|^metadata\.[\S]+$"
         else:
             valid_filter_fields = valid_fields
 

aodh/api/middleware.py

@@ -113,7 +113,7 @@ class ParsableErrorMiddleware(object):
                     if error is not None and 'faultstring' in fault:
                         fault['faultstring'] = i18n.translate(error,
                                                               user_locale)
-                except ValueError as err:
+                except ValueError:
                     fault = app_data
                 body = json.dumps({'error_message': fault})
                 if six.PY3:

aodh/evaluator/__init__.py

@@ -198,7 +198,7 @@ class AlarmEvaluationService(cotyledon.Service):
         super(AlarmEvaluationService, self).__init__(worker_id)
         self.conf = conf
 
-        ef = lambda: futures.ThreadPoolExecutor(max_workers=10)
+        ef = lambda: futures.ThreadPoolExecutor(max_workers=10)  # noqa: E731
         self.periodic = periodics.PeriodicWorker.create(
             [], executor_factory=ef)
 

aodh/evaluator/loadbalancer.py

@@ -86,7 +86,7 @@ class LoadBalancerMemberHealthEvaluator(evaluator.Evaluator):
         for m in ret.get("members", []):
             try:
                 created_time = parser.parse(m['created_at'], ignoretz=True)
-            except ValueError as e:
+            except ValueError:
                 LOG.warning('Failed to parse the member created time.')
                 continue
 

aodh/storage/sqlalchemy/alembic/env.py

@@ -82,6 +82,7 @@ def run_migrations_online():
             context.run_migrations()
     conn.disconnect()
 
+
 if not hasattr(config, "conf"):
     from aodh import service
     config.conf = service.prepare_service([])

aodh/tests/functional/api/v2/test_quotas.py

@@ -32,14 +32,14 @@ class TestQuotas(v2.FunctionalTest):
         resp = self.get_json('/quotas', headers=self.auth_headers, status=200)
 
         self.assertEqual(self.project, resp.get('project_id'))
-        self.assertTrue(len(resp.get('quotas', [])) > 0)
+        self.assertGreater(len(resp.get('quotas', [])), 0)
 
     def test_get_project_quotas_by_user(self):
         resp = self.get_json('/quotas?project_id=%s' % self.project,
                              headers=self.auth_headers, status=200)
 
         self.assertEqual(self.project, resp.get('project_id'))
-        self.assertTrue(len(resp.get('quotas', [])) > 0)
+        self.assertGreater(len(resp.get('quotas', [])), 0)
 
     def test_get_other_project_quotas_by_user_failed(self):
         self.get_json(
@@ -58,7 +58,7 @@ class TestQuotas(v2.FunctionalTest):
                              status=200)
 
         self.assertEqual(self.other_project, resp.get('project_id'))
-        self.assertTrue(len(resp.get('quotas', [])) > 0)
+        self.assertGreater(len(resp.get('quotas', [])), 0)
 
     def test_post_quotas_by_admin(self):
         auth_headers = copy.copy(self.auth_headers)

tox.ini

@@ -80,7 +80,10 @@ setenv = OS_TEST_PATH=aodh/tests/functional/
 commands = pifpaf -g AODH_TEST_STORAGE_URL run postgresql -- oslo_debug_helper {posargs}
 
 [flake8]
-ignore =
+# W503 line break before binary operator
+# W504 line break after binary operator
+# E402 module level import not at top of file
+ignore = W503,W504,E402
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
 # [H106] Do not put vim configuration in source files.
 # [H203] Use assertIs(Not)None to check for None.