Index: Lib/argparse.py
===================================================================
--- Lib/argparse.py	(revisione 86635)
+++ Lib/argparse.py	(copia locale)
@@ -1919,17 +1919,12 @@
         # if we didn't consume all the argument strings, there were extras
         extras.extend(arg_strings[stop_index:])
 
-        # if we didn't use all the Positional objects, there were too few
-        # arg strings supplied.
-        if positionals:
-            self.error(_('too few arguments'))
-
         # make sure all required actions were present
-        for action in self._actions:
-            if action.required:
-                if action not in seen_actions:
-                    name = _get_action_name(action)
-                    self.error(_('argument %s is required') % name)
+        required_actions = [_get_action_name(action) for action in self._actions
+                            if action.required and action not in seen_actions]
+        if required_actions:
+            self.error(_('the following arguments are required: %s') %
+                       ', '.join(required_actions))
 
         # make sure all required groups had one option present
         for group in self._mutually_exclusive_groups:
Index: Lib/test/test_argparse.py
===================================================================
--- Lib/test/test_argparse.py	(revisione 86635)
+++ Lib/test/test_argparse.py	(copia locale)
@@ -4277,6 +4277,28 @@
         else:
             self.fail()
 
+# ==========================
+# ArgumentContentError tests
+# ==========================
+
+class TestArgumentContentError(TestCase):
+    """Test that the names of the missing args are included in
+    the error message."""
+
+    def test_missingoptions(self):
+        parser = ErrorRaisingArgumentParser(prog='PROG')
+        parser.add_argument('x', type=str)
+        parser.add_argument('-y', type=int, required=True)
+        parser.add_argument('z', type=str, nargs='+')
+
+        with self.assertRaisesRegexp(ArgumentParserError, 'x, -y, z'):
+            parser.parse_args([])
+        with self.assertRaisesRegexp(ArgumentParserError, '-y, z'):
+            parser.parse_args(['myXargument'])
+        with self.assertRaisesRegexp(ArgumentParserError, 'error:[\w ]+: z'):
+            parser.parse_args(['myXargument', '-y1'])
+
+
 # ======================
 # parse_known_args tests
 # ======================