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-rw-r--r--babel/messages/checkers.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/babel/messages/checkers.py b/babel/messages/checkers.py
index 4292c02..2706c5b 100644
--- a/babel/messages/checkers.py
+++ b/babel/messages/checkers.py
@@ -144,7 +144,7 @@ def _validate_format(format, alternative):
type_map = dict(a)
for name, typechar in b:
if name not in type_map:
- raise TranslationError('unknown named placeholder %r' % name)
+ raise TranslationError(f'unknown named placeholder {name!r}')
elif not _compatible(typechar, type_map[name]):
raise TranslationError('incompatible format for '
'placeholder %r: '