docstr: A proxy-call to the dataframe's `.to_parquet()`.
code: def to_parquet(self):
      """
      A proxy-call to the dataframe's `.to_parquet()`.
      """
      return self.dataframe.to_parquet()
  
imports: from abc import ABC
label_desc: Use image node_id 51 for calling the DataframeAbstract obj's underlying member method code with example usage: obj.to_parquet() and returns: self