account

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

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

    def change_pin(self, old_pin, new_pin):
        if not old_pin == self.__pin:
            return 'Wrong pin'
        self.__pin = new_pin
        return 'Pin changed'

account = Account(8827312, 100, 3421)
print(account.get_id(1111))
print(account.get_id(3421))
print(account.balance)
print(account.change_pin(2212, 4321))
print(account.change_pin(3421, 1234))