class Phone:

    def __init__(self, model, price, cpu, display):
        self._model = model
        self._price = price
        self._cpu = cpu
        self._display = display

class DBPhone(Phone):

    def __init__(self, model, price, cpu, display):
        super().__init__(model, price, cpu, display)

    def save_to_file(self):
        open('base', 'w').write(' '.join(map(str, [self._model, self._price, self._cpu, self._display])))

    def print_from_file(self):
        base = open('base', 'r').read().split()
        print('Model: %s\nPrice: %s\nCPU: %s\nDisplay: %s' % (base[0], base[1], base[2], base[3]))



phone = DBPhone('Samsung', 20000, 2.4, 5.5)
phone.save_to_file()
phone.print_from_file()