def main():
    wk = AddItemCounterDecorator(200.0)

    wk.addItem("Buch", 19.99)
    wk.addItem("Tasse", 12.50)

    print(f"Artikel: {wk.getItems()}")
    print(f"Guthaben: {wk.balance()}")

    if wk.checkout():
        print("ja")
        print(f"Guthaben: {wk.balance()}")
        print(f"Artikel: {wk.getItems()}")
    else:
        print("nein")


if __name__ == "__main__":
    main()