diff --git a/Lib/argparse.py b/Lib/argparse.py
index 8a12dea..e3a49e7 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -727,6 +727,8 @@ def _get_action_name(argument):
         return argument.metavar
     elif argument.dest not in (None, SUPPRESS):
         return argument.dest
+    elif argument.choices:
+        return '{' + ','.join(argument.choices) + '}'
     else:
         return None