Use parser_known_args

spleenseg/splparser.py

@@ -112,7 +112,7 @@ def parser_interpret(parser, *args, **kwargs):
         # and the CLI sys.argv  is that of the parent app
         # not spleenseg. Interpret the passwd parser and
         # return.
-        args = parser.parse_args()
+        args, unknown = parser.parse_known_args()
         return args
     if len(args):
         args = parser.parse_args(*args)