Das deutsche Python-Forum

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class Article():
    def __init__(self, articleNumber, price):
        self.__price = price
        self.__articleNumber = articleNumber

    def getPrice(self):
        return self.__price


class Book(Article):
    def __init__(self, articleNumber, price, author, title, year):
        super().__init__(articleNumber, price)
        self.__VAT = 0.07
        self.__author = author
        self.__title = title
        self.__year = year


class DVD(Article):
    def __init__(self, articleNumber, price, name, duration, countryCode):
        super().__init__(articleNumber, price)
        self.__VAT = 0.19
        self.__name = name
        self.__duration = duration
        self.__countryCode = countryCode


class ShoppingCard:
    def __init__(self):
        self.__shoppingCard = []

    def addArticeltoCard(self, artice):
        self.__shoppingCard.append(artice)

    def getBill(self):
        for item in self.__shoppingCard:
            print(type(item))
            print(super(item, self).getPrice())


book1 = Book(12, 12.50, "Der schreiberling", "das leben des X", 1993)
sc = ShoppingCard()
sc.addArticeltoCard(book1)
sc.getBill()

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[TypeError: super() argument 1 must be type, not Book]

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class Article:

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#!/usr/bin/env python3
from attr import attrib, attrs


@attrs(frozen=True)
class Article:
    VAT = None
    
    article_number = attrib()
    price = attrib()
    

@attrs
class Book(Article):
    VAT = 0.07
    
    author = attrib()
    title = attrib()
    year = attrib()


@attrs
class DVD(Article):
    VAT = 0.19
    
    name = attrib()
    duration = attrib()
    country_code = attrib()
    

class ShoppingCart:
    
    def __init__(self):
        self.items = list()
    
    def __len__(self):
        return len(self.items)
    
    def __iter__(self):
        return iter(self.items)

    def add_article(self, article):
        self.items.append(article)

    def print_bill(self):
        for item in self:
            print(type(item), item.price)


def main():
    book = Book(12, 12.50, 'Der Schreiberling', 'Das Leben des X', 1993)
    cart = ShoppingCart()
    cart.add_article(book)
    cart.print_bill()


if __name__ == '__main__':
    main()

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class Unsinn:
    def __init__(self):
        self.__so_geheim = 1000

u = Unsinn()
print(u._Unsinn__so_geheim)