def list_get(self, num_iids, fields=[], session=None):
        '''taobao.items.list.get 批量获取商品信息
        
        查看非公开属性时需要用户登录'''
        request = TOPRequest('taobao.items.list.get')
        request['num_iids'] = num_iids
        if not fields:
            item = Item()
            fields = item.fields
        request['fields'] = fields
        self.create(self.execute(request, session))
        return self.items