diff options
Diffstat (limited to 'Lib/argparse.py')
| -rw-r--r-- | Lib/argparse.py | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/argparse.py b/Lib/argparse.py index d1a6350c3fd..83258cf3e0f 100644 --- a/Lib/argparse.py +++ b/Lib/argparse.py @@ -1534,7 +1534,7 @@ class _ActionsContainer(object): action_name = kwargs.get('action') action_class = self._pop_action_class(kwargs) if not callable(action_class): - raise ValueError('unknown action {action_class!r}') + raise ValueError(f'unknown action {action_class!r}') action = action_class(**kwargs) # raise an error if action for positional argument does not |