Python 练习：简单的购物车(二)

优化了上一个购物车程序：http://www.cnblogs.com/klvchen/p/8577269.html

#输入工资
salary = input("Please input your salary: ")

#判断工资是否为整数
if salary.isdigit():
    salary = int(salary)
else:
    exit("you must input digit")

#定义购物车
cart = []
#商品信息
msg = [["iphone6s", 5800], ["mac book", 9000], ["coffee", 32], ["bicycle", 1500]]

while True:
　　#展示商品信息
    for k, v in enumerate(msg, 1):
        print("%s 商品名称: %s, 价格: %d" % (k, v[0], v[1]))
    choice = input("Please select the product number you need to purchase ! [q] to exit")
　　#退出
    if choice == 'q':
        print("========== You have buy ==========")
        for l in cart:
            print(l)
        exit()
　　#选择商品
    if choice.isdigit():
        choice = int(choice)
        if 0 < choice <= len(msg):
　　　　　　　#判断余额是否充足
            if salary >= msg[choice-1][1]:
                salary -= msg[choice-1][1]
                print("You have buy %s, money has %d" %(msg[choice-1][0], salary))
                cart.append(msg[choice-1][0])
            else:
                print("You don't you enough money! money has %d" %salary )
        else:
            print("Please select right product number!")
    else:
        print("Please select right options")

运行结果如下：

程序还有很多可以优化的地方，以后有空再琢磨~