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-rw-r--r--pint/facets/plain/registry.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/pint/facets/plain/registry.py b/pint/facets/plain/registry.py
index 035d151..a35e508 100644
--- a/pint/facets/plain/registry.py
+++ b/pint/facets/plain/registry.py
@@ -464,7 +464,7 @@ class PlainRegistry(metaclass=RegistryMeta):
if self._on_redefinition == "raise":
raise RedefinitionError(key, type(value))
elif self._on_redefinition == "warn":
- logger.warning("Redefining '{}' ({})".format(key, type(value)))
+ logger.warning(f"Redefining '{key}' ({type(value)})")
target_dict[key] = value
if casei_target_dict is not None: