Error message small fix
@@ -232,7 +232,7 @@ class HolidayBase(dict):
not in self.subdivisions + self._deprecated_subdivisions
):
raise NotImplementedError(
- "Country {self.country} does not have subdivision "
+ f"Country {self.country} does not have subdivision "
f"'{subdiv}'"
)
if isinstance(years, int):
