diff --git a/bin/event_notification_util.py b/bin/event_notification_util.py
index 380a120..9c52176 100755
--- a/bin/event_notification_util.py
+++ b/bin/event_notification_util.py
@@ -8,39 +8,41 @@
 
 save_dir_path = sys.path.pop(0)
 
-modules = ['gen_arg', 'gen_print', 'gen_valid', 'event_notification']
+modules = ["gen_arg", "gen_print", "gen_valid", "event_notification"]
 for module in modules:
     exec("from " + module + " import *")
 
 sys.path.insert(0, save_dir_path)
 
 parser = argparse.ArgumentParser(
-    usage='%(prog)s [OPTIONS]',
+    usage="%(prog)s [OPTIONS]",
     description="%(prog)s will subscribe and receive event notifications when "
-                + "properties change for the given dbus path.",
+    + "properties change for the given dbus path.",
     formatter_class=argparse.ArgumentDefaultsHelpFormatter,
-    prefix_chars='-+')
+    prefix_chars="-+",
+)
 parser.add_argument(
-    '--host',
-    default='',
-    help='The host name or IP of the system to subscribe to.')
+    "--host",
+    default="",
+    help="The host name or IP of the system to subscribe to.",
+)
 parser.add_argument(
-    '--username',
-    default='root',
-    help='The username for the host system.')
+    "--username", default="root", help="The username for the host system."
+)
 parser.add_argument(
-    '--password',
-    default='',
-    help='The password for the host system.')
+    "--password", default="", help="The password for the host system."
+)
 parser.add_argument(
-    '--dbus_path',
-    default='',
-    help='The path to be monitored (e.g. "/xyz/openbmc_project/sensors").')
+    "--dbus_path",
+    default="",
+    help='The path to be monitored (e.g. "/xyz/openbmc_project/sensors").',
+)
 parser.add_argument(
-    '--enable_trace',
+    "--enable_trace",
     choices=[0, 1],
     default=0,
-    help='Indicates that trace needs to be enabled.')
+    help="Indicates that trace needs to be enabled.",
+)
 
 
 # Populate stock_list with options we want.