求大神解答!!!

窝在家里写程序

class HouseItem:

    def __init__(self,name,daxiao):

        self.name = name
        self.daxiao = daxiao

    def __str__(self):

        return f"家具名称为:{self.name},占地大小为:{self.daxiao}"


class House:

    def __init__(self,hx,zmj):


        self.hx = hx
        self.zmj = zmj

        self.syu = zmj

        fjsy_list = []

    def __str__(self):

        return f"房子的户型是{self.hx},房子的面积是:{self.zmj},剩余面积是:{self.syu}"

    def jiaju(self,mile):

        print(f"您已添加{mile}")

chuang = HouseItem("席梦思",4)
yigui = HouseItem("柜子",2)
changzuo = HouseItem("餐桌",1.5)


print(f"{chuang}\n{yigui}\n{changzuo}")



kai = House("两室一厅",60)

House.jiaju(chuang)


print(kai)

一个账号

没有传递参数 mile，加上就行了

class HouseItem:

    def __init__(self,name,daxiao):

        self.name = name
        self.daxiao = daxiao

    def __str__(self):

        return f"家具名称为:{self.name},占地大小为:{self.daxiao}"


class House:

    def __init__(self,hx,zmj):


        self.hx = hx
        self.zmj = zmj

        self.syu = zmj

        fjsy_list = []

    def __str__(self):

        return f"房子的户型是{self.hx},房子的面积是:{self.zmj},剩余面积是:{self.syu}"

    def jiaju(self,mile):

        print(f"您已添加{mile}")

chuang = HouseItem("席梦思",4)
yigui = HouseItem("柜子",2)
changzuo = HouseItem("餐桌",1.5)


print(f"{chuang}\n{yigui}\n{changzuo}")



kai = House("两室一厅",60)

House.jiaju(chuang, 1.2)


print(kai)

z5560636

错误原因
没有对类进行实例化。
错误的地方帮你标注上了，如下：

class HouseItem:

    def __init__(self,name,daxiao):

        self.name = name
        self.daxiao = daxiao

    def __str__(self):

        return f"家具名称为:{self.name},占地大小为:{self.daxiao}"


class House:

    def __init__(self,hx,zmj):


        self.hx = hx
        self.zmj = zmj

        self.syu = zmj

        fjsy_list = []

    def __str__(self):

        return f"房子的户型是{self.hx},房子的面积是:{self.zmj},剩余面积是:{self.syu}"

    def jiaju(self,mile):
        # 没有减少面积的运算
        self.syu -= mile.daxiao
        print(f"您已添加{mile}")

chuang = HouseItem("席梦思",4)
yigui = HouseItem("柜子",2)
changzuo = HouseItem("餐桌",1.5)


print(f"{chuang}\n{yigui}\n{changzuo}")



kai = House("两室一厅",60)

# House.jiaju(chuang)
kai.jiaju(chuang)

print(kai)