购物车小程序

功能要求：
v = 2000
要求用户输入总资产，例如：2000
显示商品列表，让用户根据序号选择商品，加入购物车
购买，如果商品总额大于总资产，提示账户余额不足，否则，购买成功。

 goods_i = [
      ['电脑', 6500],
      ['鼠标', 1200],
      ['游艇', 99],
      ['美女', 998],
      ['Bike', 999],
 ]

#/usr/bin/env python
# -*- coding:utf-8 -*-
# Author:ylw

goods_i = [
    ['电脑', 6500],
    ['鼠标', 1200],
    ['游艇', 99],
    ['美女', 998],
    ['Bike', 999],
]
shopping_cart = []

salary = int (input("输入你的工资："))

while True:
    for index, i in enumerate(goods_i):
        print("%s.\t%s\t%s" % (index, i[0], i[1]))

    choice = input(">>>:").strip()
    if len(choice) == 0:
        print('输入有误，请重新输入！')
        continue
    if choice.isdigit():
        choice = int(choice)
        if choice < len(goods_i) and choice >=0:
            goods_item = goods_i[choice] #获取商品
            if salary >= goods_item[1]: #买的起
                salary -= goods_item[1] #扣钱
                shopping_cart.append(goods_item)
                print("以购买商品%s，您的余额还剩：%s" %(goods_item[0], salary))
                print("商品购买完成输入exit退出")

            else:
                print("对不起您的余额不足，还需", goods_item[1] - salary)
        else:
            print("没有此商品，请重新输入！")
    elif choice == "exit":
        total_cost = 0
        print("您购买了以下产品：")
        for i in shopping_cart:
            print(i)
            total_cost += i[1]

        print("商品总价格：",total_cost)
        print("您当前的余额为：",salary)
        print("欢迎下次光临！拜拜再见，古德拜！")
        break