# coding=utf-8

 name_l = []

 passwd_l = []

 money_l = []

 goods = {}

 index = 0

 def input_user():

     print("输入个人信息：")

     while True:

         name = input("name: ")

         if  name == "结束！":

             break

         passwd = input("passwd: ")

         money = float(input("money: "))

         name_l.append(name)

         passwd_l.append(passwd)

         money_l.append(money)

 def login():

     print("登录：")

     suc = False

     while not suc:

         name = input("name: ")

         if name not in name_l:

             print("用户名不存在")

             continue

         passwd = input("passwd: ")

         global index

         index = name_l.index(name)

         if passwd == passwd_l[index]:

             print("登录成功")

             suc = True

         else:

             print("密码错误")

 def input_goods():

     print("商品：")

     while True:

         name_goods = input("goods_name: ")

         if name_goods == "结束！":

             break

         price = input("price: ")

         goods[name_goods] = int(price)

 def input_buy():

     print("购买：")

     while True:

         name_goods = input("buy_goods_name: ")

         if name_goods not in goods:

             print("商品不存在！")

             continue

         amount = int(input("amount: "))

         if money_l[index] < goods[name_goods] * amount:

             print("余额不足")

             break

         else:

             money_l[index] -= goods[name_goods] * amount

             print("购买成功", "余额%f" % money_l[index])

 input_user()

 input_goods()

 login()

 input_buy()