code: def __init__(self, dropna=None, use_arrow_dtype=None, **kw):
      super().__init__(
          _dropna=dropna, _use_arrow_dtype=use_arrow_dtype, **kw
      )
  
imports: import pandas
  from ...None import opcodes
  from ...core import OutputType
  from ...config import options
  from ...serialization.serializables import BoolField
  from ...utils import lazy_import
  from ..arrays import ArrowListArray, ArrowListDtype
  from .core import DataFrameReductionOperand, DataFrameReductionMixin, CustomReduction
label_desc: Use image node_id 1 to create a new DataFrameNunique object from inherited base classes: DataFrameReductionOperand, DataFrameReductionMixin with example: obj = DataFrameNunique(dropna, use_arrow_dtype)