Accepts: list of tuples in the format (ip, port)
        Returns: unicode

def publish(self, value):
        """
        Accepts: list of tuples in the format (ip, port)
        Returns: unicode
        """
        if not isinstance(value, list):
            raise ValueError(value)
        slaves = ['%s:%d' % x for x in value]
        return unicode(", ".join(slaves))