diff --git a/bilean/common/config.py b/bilean/common/config.py
index a78f5aa..d9c05a5 100644
--- a/bilean/common/config.py
+++ b/bilean/common/config.py
@@ -45,7 +45,7 @@ service_opts = [
     cfg.StrOpt('environment_dir',
                default='/etc/bilean/environments',
                help=_('The directory to search for environment files.')),
-    ]
+]
 
 rpc_opts = [
     cfg.StrOpt('host',
@@ -69,7 +69,7 @@ authentication_opts = [
                help=_('Name of the domain for the service user.')),
     cfg.StrOpt('service_project_domain', default='Default',
                help=_('Name of the domain for the service project.')),
-    ]
+]
 
 clients_group = cfg.OptGroup('clients')
 clients_opts = [
diff --git a/bilean/common/utils.py b/bilean/common/utils.py
index 4bb73b7..f172f72 100644
--- a/bilean/common/utils.py
+++ b/bilean/common/utils.py
@@ -145,7 +145,7 @@ def random_name(length=8):
 
     lead = random.choice(string.ascii_letters)
     tail = ''.join(random.choice(string.ascii_letters + string.digits)
-                   for i in range(length-1))
+                   for i in range(length - 1))
     return lead + tail
 
 
diff --git a/bilean/engine/scheduler.py b/bilean/engine/scheduler.py
index e5734bb..19d05e1 100644
--- a/bilean/engine/scheduler.py
+++ b/bilean/engine/scheduler.py
@@ -49,7 +49,7 @@ bilean_task_opts = [
     cfg.StrOpt('connection',
                help='The SQLAlchemy connection string used to connect to the '
                     'database')
-    ]
+]
 
 bilean_task_group = cfg.OptGroup('bilean_task')
 cfg.CONF.register_group(bilean_task_group)
diff --git a/bilean/notification/converter.py b/bilean/notification/converter.py
index fe8fc13..9fd1468 100644
--- a/bilean/notification/converter.py
+++ b/bilean/notification/converter.py
@@ -160,8 +160,8 @@ class EventDefinition(object):
         return False
 
     def match_type(self, event_type):
-        return (self.included_type(event_type)
-                and not self.excluded_type(event_type))
+        return (self.included_type(event_type) and
+                not self.excluded_type(event_type))
 
     @property
     def is_catchall(self):
diff --git a/tox.ini b/tox.ini
index a201b30..8cefa89 100644
--- a/tox.ini
+++ b/tox.ini
@@ -34,7 +34,7 @@ commands = {posargs}
 commands = python setup.py build_sphinx
 
 [flake8]
-ignore = 
+ignore = E731
 exclude = .venv,.git,.tox,cover,dist,*lib/python*,*egg,tools,build
 max-complexity=20