books = [Book('Suzane Collins', 'The Hunger Games', 'Fiction', 2008, 6.96, 
    20), Book('J.K. Rowling', "Harry Potter and the Sorcerer's Stone",
    'Fantasy', 1997, 4.78, 12)]
for book in books:
    book.price *= 1.1
print(book.price)
Изменение значений списка namedtuples