Python 7 Levels, L5, Unit 49, Mall Shopping Management System I

Exercise:

class Goods():

    def __init__(self,id,name,price):
        self.id = id
        self.name = name
        self.price = price

    def __str__(self):
        msg = "ID:{0},Name:{1},Price:{2}".format(self.id,self.name,self.price)
        return msg

class BuyerAdmin():

    def show_goods(self,shopdict):
        if len(shopdict) > 0:
            print("Goods Information is:")
            for goods in shopdict.values():
                print(goods)
        else:
            print("No goods in inventory")

    def shopping(self,shopdict):
        print("Hello\n=======Welcome to Python shopping mall==========")
        total_money = 0#initialized to 0
        while True:
            self.show_goods(shopdict)
            id = input("Please input goods ID to purchase(input n to check)")
            if id == "n":
                print("You spend :",total_money)
            elif shopdict.get(id):
                num = int(input("Please input purchase quality: "))
                total_money = total_money + shopdict.get(id).price*num
                print("Goods has been added to shopping cart, tota cost is: ",total_money)
            else:
                print("Sorry, the ID you input does not exist.")


goods1 = Goods("001","Banana",15)
goods2 = Goods("002","Watermelon",20)
shopdict = {goods1.id:goods1,goods2.id:goods2}
buyerAdmin = BuyerAdmin()
buyerAdmin.shopping(shopdict)