code: def __init__(self, ddof=None, **kw):
      super().__init__(_ddof=ddof, **kw)
  
file_path: mars/mars/dataframe/reduction/var.py
imports: from ...None import opcodes
  from ...config import options
  from ...core import OutputType
  from ...serialization.serializables import Int32Field
  from .core import DataFrameReductionOperand, DataFrameReductionMixin
label_desc: Use image node_id 1 to create a new DataFrameVar object from inherited base classes: DataFrameReductionOperand, DataFrameReductionMixin with example: obj = DataFrameVar(ddof)