replace NotImplementedError with AttributeError

Fixes Python inspection of members - bug reported in pandas-dev#31474

Author: RichardBruskiewich

pandas/core/frame.py

@@ -411,7 +411,7 @@ def _constructor(self) -> Type["DataFrame"]:
 
     @property
     def _constructor_expanddim(self):
-        raise NotImplementedError("Not supported for DataFrames!")
+        raise AttributeError("Property constructor_expanddim is not supported for DataFrames!")
 
     # ----------------------------------------------------------------------
     # Constructors