# author richard_kong# !/usr/bin/env python
# --*-- encoding:utf-8 --*--
"""請閉眼寫出以下程式。
程式：購物車程式
需求: 啟動程式後，讓使用者輸入工資，然後列印商品列表
允許使用者根據商品編號購買商品
使用者選擇商品後，檢測餘額是否夠，夠就直接扣款，不夠就提醒
可隨時退出，退出時，列印已購買商品和餘額
"""shopping_cart =
shopping_goods = [["book",20],["cup",30],["pen",38],["laptop",4000],["phone",3800],
["watch",2800]]
salary = int(input("please input your salary:"))
while true:
for i in shopping_goods:
print(shopping_goods.index(i),",",i[0],":",i[1])
print("please select your goods")
command = input("please input the command:")
for i in shopping_goods:
if command.isdigit():
if int(command) == shopping_goods.index(i):
print("*******************")
if salary-i[1] >=0:
salary = salary - i[1]
print("your balance is :",salary)
else:
print("your balacne is low please choose another good")
if command == "exit":
print("your shopping cart is :",shopping_cart)
print("your balance is :",salary)
break
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