commit a0ed99bca8475cbc82e9202aa354faba2a4620f4
author Brandt Bucher <brandtbucher@gmail.com> Mon Nov 11 12:47:48 2019 -0800
committer Raymond Hettinger <rhettinger@users.noreply.github.com> Mon Nov 11 12:47:48 2019 -0800
tree 711f4057ace58c12f19608a0a428c64724a9b882
parent 84ac4376587e35d16b4d0977c4f330d9d04b690a

bpo-38438: Simplify argparse "star nargs" usage. (GH-17106)

Lib/argparse.py

diff --git a/Lib/argparse.py b/Lib/argparse.py
index 13af7ac..94e1b8a 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -591,7 +591,11 @@
         elif action.nargs == OPTIONAL:
             result = '[%s]' % get_metavar(1)
         elif action.nargs == ZERO_OR_MORE:
-            result = '[%s [%s ...]]' % get_metavar(2)
+            metavar = get_metavar(1)
+            if len(metavar) == 2:
+                result = '[%s [%s ...]]' % metavar
+            else:
+                result = '[%s ...]' % metavar
         elif action.nargs == ONE_OR_MORE:
             result = '%s [%s ...]' % get_metavar(2)
         elif action.nargs == REMAINDER: