将数据库信息转化为字典类型，部分字段信息需要转换数据类型(如：datetime)

"""
    将数据库内容输出为字典类型
    """
    db_data_list = Stu.query.filter(Stu.id >0)
    key = [i for i in Stu.__dict__.keys() if not i.startswith("_") and i != "value"] #获取字段


    def swith_db_data(key, db_data_list):
        # key:字段 db_data_list: 数据库数据
        data_list = []
        for db_data in db_data_list:
            x = {}
            for word in key:
                a = eval("db_data.%s" % word)
                x[word] = str(a)
            data_list.append(x)
        return data_list

    print(swith_db_data(key, db_data_list))

输出：[{'id': '1', 'name': '张三', 'select_num': '20'}, {'id': '2', 'name': '李四', 'select_num': '0'}]