code: def __init__(self, input_df=None, level=None, dropna=None, **kw):
      super().__init__(
          _input_df=input_df, _level=level, _dropna=dropna, **kw
      )
  
imports: from typing import Union, List
  import numpy
  import pandas
  from ...None import opcodes
  from ...core import recursive_tile
  from ...serialization.serializables import KeyField, AnyField, BoolField
  from ...utils import has_unknown_shape
  from ..operands import DataFrameOperand, DataFrameOperandMixin
  from ..utils import build_df, parse_index
label_desc: Use image node_id 1 to create a new DataFrameStack object from inherited base classes: DataFrameOperand, DataFrameOperandMixin with example: obj = DataFrameStack(input_df, level, dropna)