cleanups

Author: topper-123

pandas/core/arrays/categorical.py

@@ -1750,11 +1750,12 @@ def __contains__(self, key) -> bool:
         # if key is a NaN, check if any NaN is in self.
         if is_valid_nat_for_dtype(key, self.categories.dtype):
             if key is not self.dtype.na_value and not isinstance(key, self.dtype.type):
-                warn(f"Membership check with {key} will return False in the future. "
-                     f"Consider using {self.dtype.na_value} instead",
-                     FutureWarning,
-                     stacklevel=2,
-                     )
+                warn(
+                    f"Membership check with {key} will return False in the future. "
+                    f"Consider using {self.dtype.na_value} instead",
+                    FutureWarning,
+                    stacklevel=2,
+                )
             return self.isna().any()
 
         return contains(self, key, container=self._codes)