code: def axis(self) -> int:
      return self._axis
  
imports: import numpy
  import pandas
  from ...None import opcodes
  from ...core import OutputType
  from ...serialization.serializables import BoolField, AnyField
  from ...utils import lazy_import
  from ..utils import parse_index, build_empty_df, build_empty_series, validate_axis
  from ..operands import DataFrameOperandMixin, DataFrameOperand
label_desc: Use image node_id 2 for calling the GroupByCumReductionOperand obj's underlying member method code with example usage: obj.axis() and returns: self