class_docstr: Data source op
class_docstr_tok: ["Data","source","op"]
code: def __init__(self, size) -> None:
      self._data = list(range(size))
  
imports: from towhee.operator import PyOperator, SharedType
label_desc: Use image node_id 1 to create a new Ds object from inherited base classes: PyOperator with example: obj = Ds(size)