code: def to_csv(self, file: str, opts: dict = None) -> str:
          
          opts = opts if opts is not None else {}
          ll = self._is_valid()
          if ll:
              if not self.sas.batch:
                  print(ll['LOG'])
              else:
                  return ll
          else:
              return self.sas.write_csv(file, self.table, self.libref, self.dsopts, opts)
docs: This method will export a SAS Data Set to a file in CSV format.
  
          :param file: the OS filesystem path of the file to be created (exported from this SAS Data Set)
          :return: