help if no subcommand specified

larigira/event_manage.py

@@ -11,6 +11,7 @@ def main_list(args):
     m = EventModel(args.file)
     for alarm, action in m.get_all_alarms_expanded():
         json.dump(dict(alarm=alarm, action=action), sys.stdout, indent=4)
+        sys.stdout.write('\n')
 
 
 def main_getaction(args):
@@ -29,6 +30,7 @@ def main_add(args):
 def main():
     conf = get_conf()
     p = argparse.ArgumentParser()
+    p.set_defaults(func=None)
     p.add_argument(
         "-f", "--file", help="Filepath for DB", required=False, default=conf["DB_URI"]
     )
@@ -45,6 +47,9 @@ def main():
     sub_add.set_defaults(func=main_add)
 
     args = p.parse_args()
+    if args.func is None:
+        p.print_help()
+        sys.exit(2)
     args.func(args)