@classmethod
def create(cls, class_name, **attributes):
    """
        根据参数创建一个 leancloud.Object 的子类的实例化对象

        :param class_name: 子类名称
        :type class_name: string_types
        :param attributes: 对象属性
        :return: 派生子类的实例
        :rtype: Object
        """
    object_class = cls.extend(class_name)
    return object_class(**attributes)
