gh-139736: Fix argparse indentation overshoot

9001 · 9001 · commit 2ac39cb0dc25 · 2025-10-07T23:17:52.000Z
When calculating the --help indentation,
strip colors before counting the action length
diff --git a/Lib/argparse.py b/Lib/argparse.py
@@ -280,7 +280,7 @@ def add_argument(self, action):
         if action.help is not SUPPRESS:
 
             # find all invocations
-            get_invocation = self._format_action_invocation
+            get_invocation = lambda x: self._decolor(self._format_action_invocation(x))
             invocation_lengths = [len(get_invocation(action)) + self._current_indent]
             for subaction in self._iter_indented_subactions(action):
                 invocation_lengths.append(len(get_invocation(subaction)) + self._current_indent)
