Say I have a base class called Publication:
class Publication():
def __init__(self, title='Default', price='Default')
self.title = title
self.price = price
def gettitle(self):
self.title = input("Please type in a title: ")
def getprice(self):
self.price = input("Please type in a price: ")
And a subclass called Book that inherits from Publication:
class Book(Publication):
def __init__(self, title, author, pages, current_page, price):
super().__init__(title, price)
self.author = author
self.pages = pages
self.current_page = current_page
def turnpage(self.current_page):
self.current_page += 1
Let's say early on in the course of my program, I create an object from the Publication class:
item = Publication()
But later on I have to assign my title and my price:
item.gettitle()
item.getprice()
I input "Lord of the Rings" and 10.99 respectively so now
item.title = "Lord of the Rings"
and
item.price = 10.99
Now, let's say I have some logic in my program that, depending on the price or if the title matches a string in a list, then we know specifically it is a book (as opposed to something like a magazine or a newspaper) so now I'd like it to be
item = Book()
When I originally created my object from the Publication class, I didn't know it was a Book. But now that I know, is there a way for me to keep the attributes/methods bound to the originally created object while "extending"/"inheriting" the object (not sure if those are the right words) with the newly available attributes from the Book class?
Book.from_publication(item).