Run pyupgrade --py39-plus in all files except _vendor (again)

2 files changed, 2 insertions, 2 deletions

diff --git a/pint/facets/measurement/objects.py b/pint/facets/measurement/objects.py
index 6fa860c..aaf5750 100644
--- a/pint/facets/measurement/objects.py
+++ b/pint/facets/measurement/objects.py
@@ -133,7 +133,7 @@ class Measurement(PlainQuantity):
             # scientific notation ('e' or 'E' and sometimes 'g' or 'G').
             mstr = mstr.replace("(", "").replace(")", " ")
             ustr = siunitx_format_unit(self.units._units, self._REGISTRY)
-            return r"\SI{}{{{}}}{{{}}}".format(opts, mstr, ustr)
+            return rf"\SI{opts}{{{mstr}}}{{{ustr}}}"
 
         # standard cases
         if "L" in spec:
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: