credit cart信用卡，模型

class MyCredit:
    def __init__(self,username,money=15000):
        self.username = username
        self.money = money
    def append_user(self):
        import pickle
        with open("admin.txt","ab") as f:
            pickle.dump(self.username,f)
    def freeze_user(self):
        pass
class MyCost(MyCredit):
    def repay(self):
        self.money -= self.money
    def cost(self,cost_money):
        self.money -= cost_money
    def move_to(self,move_money):
        self.money -= move_money*0.95
    def get_money(self,get_money):
        self.money -= get_money*0.95
def main():
    inp = input("请输入：（1.用户管理 2.消费）
>>>")
    if inp == "1":
        inp2 = input("请输入：（1.添加账户 2.冻结账户）
>>>")
        if inp2 == "1":
            ret = input("添加账户：")
            MyCredit.append_user()
        if inp2 == "2":
            pass
    if inp == "2":
        pass

if __name__ == '__main__':
    main()