code: def level(self):
      return self._level
  
imports: import warnings
  from ...None import opcodes
  from ...core import get_output_types, OutputType
  from ...serialization.serializables import AnyField, StringField
  from ..core import SERIES_TYPE
  from ..operands import DataFrameOperand, DataFrameOperandMixin
  from ..utils import build_df, build_series, validate_axis, parse_index
label_desc: Use image node_id 5 for calling the DataFrameRename obj's underlying member method code with example usage: obj.level() and returns: self