code: def quote_single_identifier(self, string):
          
          c = self.get_identifier_quote_character()
  
          return "%s%s%s" % (c, string.replace(c, c + c), c)
docs: Quotes a single identifier (no dot chain separation).
  
          :param string: The identifier name to be quoted.
          :type string: str
  
          :return: The quoted identifier string.
          :rtype: str