Python -- 购物车（初级版）

product_list = [
['cup',8],
['iphone',7999],
['bag',149],
['notebook',3999],
['toy',80],
['noodles',13],
['pork',19],
['icecream',16]
]    #定义商品列表

while True:
    money = input("请输入你的拥有金额：")
    if money.isdigit() and int(money) > 0:    #判断输入是否数字及是否大于0的正整数
        money = int(money)
        break
    else:
        print("金额要为整数阿拉伯数字！")

for i in range(8):
    print("序号：",i,"，","商品：",product_list[i][0],"，","单价：",product_list[i][1])    #打印商品列表

shopping_list = []    #购物列表
shopping_list_seq = []    #购买列表中商品对应序号的列表，该列表中每个元素的值与购买列表每个元素的第一个值一致
dict01 = {}    #用于展示的字典，当选择了重复商品，可只显示一项及对应数量
total01 = 0    #总价
while True:
    choice = input("请选择商品序号或‘end’结束：")    #开始选择商品，输入商品序号
    if choice.isdigit() and int(choice) in range(8):    #判断序号是否数字及是否有效序号
        shopping_list.append([int(choice),product_list[int(choice)][0],product_list[int(choice)][1]])    #已选商品相关信息添加到购物列表（商品可重复）
        shopping_list_seq.append(int(choice))    #同时追加商品序号列表
    elif choice == 'end':
        for j in range(len(shopping_list)):    #根据购物列表长度循环，将商品写入字典，用数量标记重复选择的商品
            dict01[shopping_list[j][0]] = [shopping_list[j][1],shopping_list[j][2],shopping_list_seq.count(shopping_list_seq[j])]    #购物列表里的序号为字典里的key，值分配为[商品名称,商品单价,商品数量]
        print("您的选择商品请单如下："
        for k in dict01:
            total01 = total01 + dict01[k][2] * dict01[k][1]
            print("序号：",k,",","商品：",dict01[k][0],",","单价：",dict01[k][1],",","数量：",dict01[k][2],",","价格：",dict01[k][2]*dict01[k][1])    #打印已选清单
        print("总计：",total01)
        print("现有余额：", money)
        print("消费后余额：",money - total01)
        break
    else:
        print("请输入正确的商品序号或‘end’结束")

while True:
    if total01 > money:    #判断是否金额不足
        dict01.clear()
        print("您没有足够的金额，请减少选择的商品")
        minus = input("请输入您要减少的商品序号或‘end’结束：")
        if minus.isdigit() and int(minus) in shopping_list_seq:    #判断删减的商品序号是否为数字及是否存在于序号列表
            shopping_list.remove(shopping_list[shopping_list_seq.index(int(minus))])    #移除购物列表对应商品
            shopping_list_seq.remove(int(minus))    #同时移除商品序号列表对应序号
            for n in range(len(shopping_list)):    #重新生成展示用的字典
                dict01[shopping_list[n][0]] = [shopping_list[n][1], shopping_list[n][2],shopping_list_seq.count(shopping_list_seq[n])]
            print("您的选择商品请单如下：")
            total01 = 0
            for o in dict01:
                total01 = total01 + dict01[o][2] * dict01[o][1]
                print("序号：", o, ",", "商品：", dict01[o][0], ",", "单价：", dict01[o][1], ",", "数量：", dict01[o][2], ",","价格：", dict01[o][2] * dict01[o][1])
            print("总计：", total01)
        elif minus == 'end':
            break
        else:
            print("您输入的商品序号不在已选清单里")
    else:
        confirm = input("请输入y确认支付或输入n取消交易")
        if confirm == 'y':
            money = money - total01
            print("您的购物请单如下2：")
            for k in dict01:
                print("序号：",k,",","商品：",dict01[k][0],",","单价：",dict01[k][1],",","数量：",dict01[k][2],",","价格：",dict01[k][2]*dict01[k][1])
            print("总计：",total01)
            print("余额：",money)
            break
        elif confirm == 'n':
            print("交易已取消！")
            break
        else:
            print("请按提示正确输入选项！")