--- argparse.py	2014-11-16 10:11:00.662930400 -0500
+++ argparse.new.py	2014-11-16 10:25:06.488114700 -0500
@@ -1139,9 +1139,9 @@
         # the special argument "-" means sys.std{in,out}
         if string == '-':
             if 'r' in self._mode:
-                return _sys.stdin
+                return _WrappedStdio(_sys.stdin)
             elif 'w' in self._mode:
-                return _sys.stdout
+                return _WrappedStdio(_sys.stdout)
             else:
                 msg = _('argument "-" with mode %r' % self._mode)
                 raise ValueError(msg)