Book

book.py

class Book:

    def __init__(self,pages):
        self.pages = pages
        self.current_page = 0
        self.bookmark = 0

    def read(self):
        return self.current_page

    def turn_page(self):
        self.current_page += 2
        return self.current_page

    def next_page(self):
        self.current_page += 1
        return self.current_page

    def prev_page(self):
        self.current_page -= 1
        return self.current_page

    def open_to_bookmark(self):
        return self.bookmark

    def set_bookmark(self,bookmark):
        self.bookmark = bookmark

    def goto_page(self,page):
        self.current_page = page
        self.read()


class Reference(Book):

    def __init__(self,pages,sections):
        self.sections = sections
        Book.__init__(self,pages)
    
    def goto_section(self,topic):
        self.current_page = self.sections[topic]
        return self.current_page

ref_book = Reference(700,{"plants":1,"animals":200})
ref_book.goto_section("animals")