Account

class Account:
    def __init__(self, id: int, balance, pin: int):
        self.__id = id
        self.__pin = pin
        self.balance = balance

    def get_id(self, pin):
        if pin == self.__pin:
            return self.__id
        return 'Wrong pin'

    def change_pin(self, old_pin, new_pin):
        if old_pin == self.__pin:
            self.__pin = new_pin
            return 'Pin changed'
        return 'Wrong pin'