# oop/super.duplication.py
class Book:

    def __init__(self, title, publisher, pages):
        self.title = title
        self.publisher = publisher
        self.pages = pages


class Ebook(Book):

    def __init__(self, title, publisher, pages, format_):
        self.title = title
        self.publisher = publisher
        self.pages = pages
        self.format_ = format_