diff -r 9ea84f006892 Lib/argparse.py
--- a/Lib/argparse.py	Wed May 01 15:15:50 2013 +0200
+++ b/Lib/argparse.py	Fri Sep 27 23:15:33 2013 -0700
@@ -2064,6 +2064,20 @@
 # return the list of arg string counts
 return result
 
+ def _get_nested_action(self, arg_string):
+ # recursively seek arg_string in subparsers
+ if self._subparsers is not None:
+ for action in self._subparsers._actions:
+ if isinstance(action, _SubParsersAction):
+ for parser in action._name_parser_map.values():
+ if arg_string in parser._option_string_actions:
+ return parser._option_string_actions[arg_string]
+ else:
+ sub_action = parser._get_nested_action(arg_string)
+ if sub_action is not None:
+ return sub_action
+ return None
+
 def _parse_optional(self, arg_string):
 # if it's an empty string, it was meant to be a positional
 if not arg_string:
@@ -2078,6 +2092,11 @@
 action = self._option_string_actions[arg_string]
 return action, arg_string, None
 
+ if getattr(self, 'scan', None):
+ if self._get_nested_action(arg_string):
+ # action is found in subparser; return as at end
+ return None, arg_string, None
+
 # if it's just a single character, it was meant to be positional
 if len(arg_string) == 1:
 return None
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