code: def itemsize(self):
          
          warnings.warn("{obj}.itemsize is deprecated and will be removed "
                        "in a future version".format(obj=type(self).__name__),
                        FutureWarning, stacklevel=2)
          return self._ndarray_values.itemsize
docs: Return the size of the dtype of the item of the underlying data.
  
          .. deprecated:: 0.23.0