code: def get_reduction_args(self, axis=None):
      return dict(sep=self._sep, na_rep=self._na_rep)
  
file_path: mars/mars/dataframe/reduction/str_concat.py
imports: from ...None import opcodes
  from ...core import OutputType
  from ...serialization.serializables import StringField
  from .core import DataFrameReductionOperand, DataFrameReductionMixin
label_desc: Use image node_id 4 for calling the DataFrameStrConcat obj's underlying member method code with example usage: obj.get_reduction_args(axis) and returns: dict