=== modified file 'piston_mini_client/validators.py'
--- piston_mini_client/validators.py	2012-11-22 10:12:30 +0000
+++ piston_mini_client/validators.py	2014-01-16 20:30:11 +0000
@@ -41,8 +41,8 @@
                         "Argument '%s' must be a string" % varname)
                 if not re.match(pattern, kwargs[varname]):
                     raise ValidationException(
-                        "Argument '%s' must match pattern '%s'" % (varname,
-                        pattern))
+                        "Argument '%s' must match pattern '%s'" %
+                        (varname, pattern))
             elif required:
                 raise ValidationException(
                     "Required named argument '%s' missing" % varname)