shoppping list

老男孩教育案例，拿出来和大家分享一下

#!coding:utf-8# Author:pymingmingproduct_list = [    ('Iphone', 5800),    ('Mac Pro', 9800),    ('Bike', 820),    ('watch', 10600),    ('Coffee', 31),    ('Alex python', 120)]shopping_list = [] #商品列表，打印已买商品salary = input('Input your salary:') #输入钱if salary.isdigit(): #判断输入的包不包含数字类型    salary = int(salary) #转化成数字    while True: #进入循环        for index, item in enumerate(product_list): #加下标index            #print(product_list.index(item))            print(index,item) #打印下标 和商品名        user_choice = input('选择商品代号：') #        if user_choice.isdigit(): #如果选择里有数字            user_choice = int(user_choice)  #转化为整型            if user_choice < len(product_list) and user_choice >= 0: #判断在不在范围里                p_item = product_list[user_choice]  #如果在，提取商品名称，价格                if p_item[1] <= salary: #进一步判断商品价格大小，如果小于输入工资，则不执行子程序                    shopping_list.append(p_item) #把能购买的商品加入列表                    salary -= p_item[1] #从工资里减去已买的钱数                    print('Added %s into shopping cart,your current balance is \033[31;1m%s\033[0m'%(p_item,salary)) #打印出要买的东西                else:                    print('your salary can not afford this good，please choose others')            else:                print('your choose not exist,please choose again ')        elif user_choice == 'q':#如果输入q，则打印退出            items = []            for item in shopping_list:               items.append(item)            print('you have already choose\033[32;1m [%s]\033[0m in your shopping list!'%items)            print('you have \033[31;1m%s\033[0m salary left'%salary)            exit()        else:            print('invalid option')else:    print('invalid option')

运行结果

PS J:\pymingming\day3> python shopping.pyInput your salary:50000 ('Iphone', 5800)1 ('Mac Pro', 9800)2 ('Bike', 820)3 ('watch', 10600)4 ('Coffee', 31)5 ('Alex python', 120)选择商品代号：4Added ('Coffee', 31) into shopping cart,your current balance is 49690 ('Iphone', 5800)1 ('Mac Pro', 9800)2 ('Bike', 820)3 ('watch', 10600)4 ('Coffee', 31)5 ('Alex python', 120)选择商品代号：5Added ('Alex python', 120) into shopping cart,your current balance is 48490 ('Iphone', 5800)1 ('Mac Pro', 9800)2 ('Bike', 820)3 ('watch', 10600)4 ('Coffee', 31)5 ('Alex python', 120)选择商品代号：0your salary can not afford this good，please choose others0 ('Iphone', 5800)1 ('Mac Pro', 9800)2 ('Bike', 820)3 ('watch', 10600)4 ('Coffee', 31)5 ('Alex python', 120)选择商品代号：qyou have already choose [[('Coffee', 31), ('Alex python', 120)]] in your shopping list!you have 4849 salary left