class Book:
    shape = 'circle'
    material = 'paper'
    is_paper = True

    def __init__(self, code):
        self.code = code

        if code < 300:
            print('*****')


class Electronni(Book):
    material = 'not paper'
    waterproof = 'yeah'
    wIFI = 'yeah'
    is_not_paper = False
    page = 1

    def __add__(self, other):
        self.page += other

    def __sub__(self, other):
        self.page = self.page - other

    def __str__(self):
        return f'сторінка: {self.page}, code: {self.code}'

    def foo(self):
        pass



pro = Electronni(122)


pro + 12
pro - 12



print(pro)


''.format(1, 33)