diff --git a/Lib/argparse.py b/Lib/argparse.py
index 5b5598f..a9129de 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -1277,13 +1277,13 @@
         # create the action object, and add it to the parser
         action_class = self._pop_action_class(kwargs)
         if not _callable(action_class):
-            raise ValueError('unknown action "%s"' % action_class)
+            raise ValueError('unknown action "%s"' % (action_class,))
         action = action_class(**kwargs)
 
         # raise an error if the action type is not callable
         type_func = self._registry_get('type', action.type, action.type)
         if not _callable(type_func):
-            raise ValueError('%r is not callable' % type_func)
+            raise ValueError('%r is not callable' % (type_func,))
 
         # raise an error if the metavar does not match the type
         if hasattr(self, "_get_formatter"):
diff --git a/Lib/test/test_argparse.py b/Lib/test/test_argparse.py
index 89a437d..5785eec 100644
--- a/Lib/test/test_argparse.py
+++ b/Lib/test/test_argparse.py
@@ -4016,10 +4016,12 @@
 
     def test_invalid_type(self):
         self.assertValueError('--foo', type='int')
+        self.assertValueError('--foo', type=(int, float))
 
     def test_invalid_action(self):
         self.assertValueError('-x', action='foo')
         self.assertValueError('foo', action='baz')
+        self.assertValueError('--foo', action=('store', 'append'))
         parser = argparse.ArgumentParser()
         try:
             parser.add_argument("--foo", action="store-true")