wrong opeartor, CategoricalIndex

Author: topper-123

pandas/core/generic.py

@@ -5441,7 +5441,7 @@ def _dir_additions(self) -> Set[str]:
         """
         additions = super()._dir_additions()
         if self._info_axis._can_hold_strings:
-            additions &= self._info_axis._dir_additions_for_owner
+            additions.update(self._info_axis._dir_additions_for_owner)
         return additions
 
     # ----------------------------------------------------------------------

pandas/core/indexes/category.py

@@ -161,6 +161,10 @@ class CategoricalIndex(ExtensionIndex, accessor.PandasDelegate):
 
     _typ = "categoricalindex"
 
+    @property
+    def _can_hold_strings(self) -> bool:
+        return self.categories._can_hold_strings
+
     codes: np.ndarray
     categories: Index
     _data: Categorical