简单购物车的实现

commodity_list=[['iphone6s',5800],['mac book',9000],['coffee',32],['python book',80],['bicycle',1500]] #商品列表
purchased_commodity=[]                                     #已购商品列表
while True:
    account_blance=input("请输入账户余额:")
    if account_blance.isdigit():
        account_blance=int(account_blance)
        consumption_count=0
        break
    else:
        print("账户余额必须是数字")                        #以上代码是让用户输入账户余额
while True:
    print("商品列表如下：")
    for i, j in enumerate(commodity_list, 1):
        print(i, '<<<', j)                                 #打印商品列表
    commodity_number=input("请输入商品编号:")
    if commodity_number.isdigit():
        commodity_number=int(commodity_number)
        if commodity_number>=1 and commodity_number<=5:    #判断用户输入的编号是否合规
            if commodity_list[commodity_number-1][1]<= account_blance:
                purchased_commodity.append(commodity_list[commodity_number - 1])
                print("%s已加入购物车" % commodity_list[commodity_number-1][0])
                account_blance-=commodity_list[commodity_number-1][1]
                consumption_count+=commodity_list[commodity_number-1][1]
            else:
                print("您当前账户余额不足")                #把用户选择的商品加入购物车
            while True:
                shopping_flag=input("如果继续购买，请输入Y,否则请输入N：")
                if shopping_flag=='Y'or shopping_flag=='N':
                    break
                else:
                    print("请输入Y或者N")                   #判断用户是否继续购买
            if shopping_flag == 'N':
                break                                       #如果用户选择N,退出循环
        else:
            print("商品编号为1到5间的数字")
    else:
        print("商品编号应该是数字")
print("**********您已购买以下物品***********:")               #输出用户已购商品信息
for i in purchased_commodity:
    print(i)
print("您一共消费了%s元" % consumption_count)
print("您的账户余额为%s元" % account_blance)