--- a/fail.py	Mon Feb 29 13:48:39 2016 -0800
+++ b/fail.py	Tue Aug 23 13:57:20 2016 -0700
@@ -10,6 +10,7 @@
 import sys
 import time
 
+
 def main(args=sys.argv[1:]):
     """CLI"""
 
@@ -20,7 +21,7 @@
                         help="allowed exit codes")
     parser.add_argument('-s', '--sleep', dest='sleep',
                         type=float, default=1.,
-                        help="sleep between iterations [DEFAULT: %(default)]")
+                        help="sleep between iterations [DEFAULT: %(default)s]")
     options = parser.parse_args(args)
 
     try: