python编写购物车新写法

用另一种方式完成购物车的功能实现

#!/usr/bin/python
zijin = input("请输入资金：")
if zijin.isdigit():
    zijin = int(zijin)
else:
    print("请输入数字！")
exit_flag = False
print("欢迎来到本人的购物小店".center(40,"-"))
shop_list = [
    ("电脑", 1999),
    ("鼠标", 800),
    ("键盘", 299),
    ("鼠标垫", 100)
]
gouwuche = []
xiaofei = 0
while exit_flag is not True:
    print("商品列表如下：".center(44,"-"))
    for item in enumerate(shop_list):
        index = item[0]
        sp_name = item[1][0]
        sp_price = item[1][1]
        print(index, ".", sp_name, sp_price)
    user_choice = input("请输入商品编号进行购买：")
    if user_choice.isdigit():
        user_choice = int(user_choice)
        if user_choice < len(shop_list):
            sp_item = shop_list[user_choice]
            if sp_item[1] <= zijin:
                gouwuche.append(sp_item)
                zijin -= sp_item[1]
                xiaofei += sp_item[1]
                print("您成功购买了：[%s] 花费了：[%s] 余额为：[%s]" %(sp_item[0], sp_item[1], zijin))
            else:
                print("您的金额不足！还差 [%s] 才能购买此商品！" %(sp_item[1] - zijin))
    else:
        if user_choice == "q" or user_choice == "quick":
            print("您本次购买了如下商品：".center(40, "-"))
            for g_list in gouwuche:
                print(g_list)
            print("结束".center(45, "-"))
            print("您总共消费了：[%s] 余额为：[%s]" %(xiaofei, zijin))
            exit_flag = True