Python 对象类型转换为元组类型

给对象添加一个 __iter__ 函数：

file:[src/pojos.py]
class Cover:
    def __init__(self, temp, accel_x, accel_y, accel_z, cover_status):
        self.temp = temp
        self.accel_x = accel_x
        self.accel_y = accel_y
        self.accel_z = accel_z
        self.cover_status = cover_status
        self.date = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(time.time()))

    # 通过定义 __iter__() 方法将其转换为元组或其他可迭代对象。
    def __iter__(self):
        yield self.temp
        yield self.accel_x
        yield self.accel_y
        yield self.accel_z
        yield self.cover_status
        yield self.date

比如，在插入数据库的时候，把对象转换为元组类型，通过 tuple 函数转换：

file:[src/mysql_utils.py]
def insert_cover(data: pojos.Cover):
    sql = "insert into covers (temp, accel_x, accel_y, accel_z, cover_status, date) values(%s, %s, %s, %s, %s, %s, %s, %s)"
    exeSql(sql, tuple(data))