python购物车练习

class Shopping:
    def __init__(self):
        self.car = []

    def shopping_car(self, itme):
        self.car.append(itme)

    def shopping_del(self, itme):
        self.car.remove(itme)

    def shopping_all(self):
        if self.car:
            for i in self.car:
                print(i)
        else:
            print("快去添加你喜欢的物品吧")

    def shopping_s(self):
        s = 0
        for i in self.car:
            s += jg[i]
        print(s)


jg = {"oppo": 3999, "realme": 4999, "xiaomi": 5999, "vivo": 6999, "meizu": 7999, "huawei": 8999, "apple": 9999}
shopping = Shopping()
b = 1
while(b):
    b = int(input("购买物品输入1,删除物品输入2，显示购物车所有物品输入3，显示购物车总价输入4,输入0退出"))
    if b == 1:
        print("物品价格表", jg)
        a = input("输入购买物品")
        shopping.shopping_car(itme=a)
    elif b == 2:
        a = input("输入删除物品")
        shopping.shopping_del(a)
    elif b == 3:
        shopping.shopping_all()
    elif b == 4:
        print("当前购物车一共", shopping.shopping_s(), "元")
    elif b != 0:
        print("请输入合法指令")
print("已退出")