bpo-24444: fix an error in argparse help when help for an option is blank (GH-28050) (GH-28931)
(cherry picked from commit 6fafc25aea8689048314b5bf7a9bb986bb1ce238)
Co-authored-by: andrei kulakov <andrei.avk@gmail.com>
diff --git a/Lib/argparse.py b/Lib/argparse.py
index ce4635a..f1f6f32 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -526,12 +526,13 @@ def _format_action(self, action):
parts = [action_header]
# if there was help for the action, add lines of help text
- if action.help:
+ if action.help and action.help.strip():
help_text = self._expand_help(action)
- help_lines = self._split_lines(help_text, help_width)
- parts.append('%*s%s\n' % (indent_first, '', help_lines[0]))
- for line in help_lines[1:]:
- parts.append('%*s%s\n' % (help_position, '', line))
+ if help_text:
+ help_lines = self._split_lines(help_text, help_width)
+ parts.append('%*s%s\n' % (indent_first, '', help_lines[0]))
+ for line in help_lines[1:]:
+ parts.append('%*s%s\n' % (help_position, '', line))
# or add a newline if the description doesn't end with one
elif not action_header.endswith('\n'):