code: def identifier(self, mask: str = '##-##/##') -> str:
          
          return self.random.custom_code(mask=mask)
docs: Generate a random identifier by mask.
  
          With this method you can generate any identifiers that
          you need. Simply select the mask that you need.
  
          :param mask:
              The mask. Here ``@`` is a placeholder for characters and ``#`` is
              placeholder for digits.
          :return: An identifier.
  
          :Example:
              07-97/04