#belle shopping cart

productList=[
    ("iphone",5800),
    ("mac pro",9800),
    ("bike",800),
    ("watch",10600),
    ("coffe", 31),
    ("book", 120),
]
shoppingList=[]
salary=input("input salary:")
if salary.isdigit():
    salary=int(salary)
    while True:

        #for item in productList:
           # print(productList.index(item),item)#productlist.index(item)是下标，还有另一种方法：enumerate
        for index,item in enumerate(productList) :
            print(index,item)#打印带有序号的商品列表

        userChoice=input("要买什么>>>>：")
        if userChoice.isdigit():
            userChoice=int(userChoice)
            #判断一下用户选择的序号有没有超过最大数值
            if userChoice<len(productList) and userChoice>=0:
                productItem=productList[userChoice]
                if productItem[1]<=salary:#买的起,下一步是加入购物车
                    shoppingList.append(productItem)
                    salary-=productItem[1]
                    print("Added %s into shopping cart,your current balance is \033[31;1m%s\033[0m" %(productItem,salary))#高亮显示金额
                    #print("Added %s into shopping cart,your current balance is %s" % (productItem, salary))#不高亮显示
                else:
                    print("\033[41;1m你的余额只剩[%s]啦，还买个毛线\033[0m" % salary)#\033[41;1m     \033[0m高亮显示你的余额只剩[%s]啦，还买个毛线

            else:
                print("product code [%s] is not exist!"% userChoice)
        elif userChoice=='q':   #想要退出，接下来打印购物列表
            print("-------shopping list---------")
            for p in shoppingList:
                print(p)
            print("your current blance: ",salary)
            exit()
        else:
            print("invaid option")

print("Added %s into shopping cart,your current balance is \033[1;31;40m%s\033[0m" % (productItem, salary))#高亮显示金额方式二

知识链接：

python enumerate用法总结 - CSDN博客

https://blog.csdn.net/churximi/article/details/51648388

Python中输出字体的颜色设置 - CSDN博客

https://blog.csdn.net/wuxiushu/article/details/52427374

1. 例子：  
2. \033[1;31;40m   <!--1-高亮显示 31-前景色红色  40-背景色黑色-->  
3. 加上 %s 再加上
4. \033[0m          <!--采用终端默认设置，即取消颜色设置-->