题目: 购物车程序

业需求:数据结构：goods = [{"name": "电脑", "price": 1999},{"name": "鼠标", "price": 10},{"name": "游艇", "price": 20},{"name": "美女", "price": 998},......]

功能要求：

基础要求：1、启动程序后，输入用户名密码后，让用户输入工资，然后打印商品列表2、允许用户根据商品编号购买商品3、用户选择商品后，检测余额是否够，够就直接扣款，不够就提醒4、可随时退出，退出时，打印已购买商品和余额5、在用户使用过程中， 关键输出，如余额，商品已加入购物车等消息，需高亮显示

扩展需求：

1、用户下一次登录后，输入用户名密码，直接回到上次的状态，即上次消费的余额什么的还是那些，再次登录可继续购买2、允许查询之前的消费记录

基础功能实现：

goods = [{"name": "电脑", "price": 1999},{"name": "鼠标", "price": 10},{"name": "游艇", "price": 20},{"name": "美女", "price": 998},]goods.append("退出")name = input("what is your name:")password = input("input your password:")salary = int(input("how much your salary:"))for index,items in enumerate(goods):    print(index,items)cart=[]while True:    commodity = int(input("input goods what your want to buy:"))    if commodity >= len(goods):        print("your input number is over goods's price")        continue    elif commodity == int(len(goods) - 1):        # salary = salary - goods[commodity]["price"]        print("Your balance is \033[1;32m$% s\033[0m!" % salary)        print("your have buy some such as \033[1;32m% s\033[0m!" % cart)        break    else :        print(goods[commodity])        if goods[commodity]["price"] <= salary :            salary = salary - goods[commodity]["price"]            cart.append(goods[commodity])            print("\033[1;32mThe merchandise has been added to the shopping cart\033[0m!.Your balance is \033[1;32m$% s\033[0m!" % salary)        else:            print("You have \033[1;31m$% s\033[0m!, \033[1;31mYou don't have enough balance!!!\033[0m!" % salary)