code: def show_keyword_help(cur, arg):
      
      keyword = arg.strip('"').strip("'")
      query = "help '{0}'".format(keyword)
      log.debug(query)
      cur.execute(query)
      if cur.description and cur.rowcount > 0:
          headers = [x[0] for x in cur.description]
          return [(None, cur.fetchall(), headers, '')]
      else:
          return [(None, None, None, 'No help found for {0}.'.format(keyword))]
docs: Call the built-in "show <command>", to display help for an SQL keyword.
      :param cur: cursor
      :param arg: string
      :return: list