购物车

products = [['iphone8',6888],['Macpro',14800],['小米6',2499],['Coffee',31],['Book',80],['Nike Shoes',799]]
# print('---------------------商品列表------------------')
# for index,i in enumerate(products):
#     print('%s.  %s      %s' %(index,i[0],i[1]))

shopping_cart = []    # 购物车

run_flag = True     # 使用标志位退出while循环
while run_flag :

    print('---------------------商品列表------------------')
    for index, i in enumerate(products):
        print('%s.  %s      %s' % (index, i[0], i[1]))

    choice = (input("请输入想要购买商品的编号："))   # 输入购买商品编号   input 取值都是字符串

    if choice.isdigit():
        choice = int (choice)                       # 改成数字
        if choice >= 0 and choice < len(products):     # 判断输入值在商品编码范围内
            shopping_cart.append(products[choice])           # 加入购物车
            print('Added products %s into shopping cart. '%(products[choice]))
        else :
            print('商品不存在')
    elif choice == 'q' :
        if len(shopping_cart) > 0:                       # 判断购物车商品是否为空
            print('------------------你已购买以下商品：-------------------')
            for index,i in enumerate(shopping_cart):              # index 和 i  可以重复使用，占位
                print('%s.  %s      %s' % (index, i[0], i[1]))

        # break
        run_flag = False

第一次练习 购物车作业