Provide new object for copy routines requiring info. on its destination.

Author: dangreb

pandas/core/generic.py

@@ -6115,7 +6115,7 @@ def __finalize__(self, other, method: str | None = None, **kwargs) -> Self:
                 # We provide the new dataset via the deepcopy memo to properly
                 # supply eventual attribute copy routines requiring information
                 # from its destination
-                self.attrs = deepcopy(other.attrs, memo={object:self})
+                self.attrs = deepcopy(other.attrs, memo={object(): self})
             self.flags.allows_duplicate_labels = (
                 self.flags.allows_duplicate_labels
                 and other.flags.allows_duplicate_labels
@@ -6133,7 +6133,7 @@ def __finalize__(self, other, method: str | None = None, **kwargs) -> Self:
                 attrs = objs[0].attrs
                 have_same_attrs = all(obj.attrs == attrs for obj in objs[1:])
                 if have_same_attrs:
-                    self.attrs = deepcopy(attrs)
+                    self.attrs = deepcopy(attrs, memo={object(): self})
 
             allows_duplicate_labels = all(x.flags.allows_duplicate_labels for x in objs)
             self.flags.allows_duplicate_labels = allows_duplicate_labels