Sets the list element at ``index`` to ``value``. An error is returned for out of
        range indexes.

        :param string name: the queue name
        :param int size: the max length of removed elements        
        :return: the length of removed elements
        :rtype: int

def qtrim_back(self, name, size=1):
        """
        Sets the list element at ``index`` to ``value``. An error is returned for out of
        range indexes.

        :param string name: the queue name
        :param int size: the max length of removed elements        
        :return: the length of removed elements
        :rtype: int
        
        """
        size = get_positive_integer("size", size)
        return self.execute_command('qtrim_back', name, size)