code: def create_append(filename: str, layers: Union[np.ndarray, Dict[str, np.ndarray], loompy.LayerManager], row_attrs: Dict[str, np.ndarray], col_attrs: Dict[str, np.ndarray], *, file_attrs: Dict[str, str] = None, fill_values: Dict[str, np.ndarray] = None) -> None:
  	
  	deprecated("'create_append' is deprecated. See https://github.com/linnarsson-lab/loompy/issues/42")
  	if os.path.exists(filename):
  		with connect(filename) as ds:
  			ds.add_columns(layers, col_attrs, fill_values=fill_values)
  	else:
  		create(filename, layers, row_attrs, col_attrs, file_attrs=file_attrs)
docs: **DEPRECATED** - Use `new` instead; see https://github.com/linnarsson-lab/loompy/issues/42