code: def exist(self, table: str, libref: str = "") -> bool:
          
          return self._io.exist(table, libref)
docs: Does the SAS data set currently exist
  
          :param table: the name of the SAS Data Set
          :param libref: the libref for the Data Set, defaults to WORK, or USER if assigned
          :return: Boolean True it the Data Set exists and False if it does not
          :rtype: bool