code: def table_columns(self):
          '''Yields column names.'''
          with self.conn.cursor() as cur:
              cur.execute(self.TABLE_COLUMNS_QUERY % self.database)
              for row in cur:
                  yield rof table_columns(self):
          '''Yields column names.'''
          with self.conn.cursor() as cur:
              cur.execute(self.TABLE_COLUMNS_QUERY % self.database)
              for row in cur:
                  yield row
docs: Yields column names.