Я пытаюсь создать скрипт на Python, который вычисляет окончательную сумму, подлежащую выплате, когда дается список книг.

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Я хочу создать меню, в котором пользователь может выбрать несколько вариантов из списка. и примените окончательную скидку. с этими параметрами:
Все книги, изданные после 2000 года, имеют скидку 10%. • Купите книги на общую сумму более 30 фунтов стерлингов, получите скидку 5% от общей суммы.

Доступны следующие книги: • xxxx (1851) £15.20 • xxxx (2010) £13.14 • xxxx (1980) £11.05 • xxxxx (1976) £10.24 • xxxxx (1889) £12.87 • xxxxx (1895) £10.43 • xxxx (1954) £8.12 • xxxx (1886) £7.32 • xxxxx (1843) £4.23 • xxxx (1859) £6.32 • xxx (1861) £13.21

Это моя первая попытка кодирования, пожалуйста, полегче со мной. Заранее спасибо.

Что я уже пробовал:

menu = 3
while menu == 3:
    print ("Select book option")
    print ("1 Moby Dick (1851)- £15.20")
    print ("2 The Terrible Privacy of Maxwell Sim (2010) - £13.14")
    print ("3 Still Life With Woodpecker (1980) - £11.05")
    print ("4 Sleeping Murder (1976) - £10.24")
    print ("5 Three Men in a Boat (1889) - £12.87")
    print ("6 The Time Machine (1895) - £10.43")
    print ("7 The Caves of Steel (1954) - £8.12")
    print ("8 Idle Thoughts of an Idle Fellow (1886) - £7.32")
    print ("9 A Christmas Carol (1843) - £4.23")
    print ("10 A Tale of Two Cities (1859) - £6.32")
    print ("11 Great Expectations (1861) - £13.21")
    
def option():
    while True:
        option = int(input('select an option from 1 to 11 '))
        if option > 11 or option < 1:
            print ("Option not avialable. Try again! ")
            option()
        elif option == 1:
            print ("You select option 1 Moby Dick (1851)- £15.20")
            cont = input('Enter Y to add another option or N to finish: ')
            if cont == "N":
                   exit
            elif cont == "Y":
                   menu = 3
                   
            else:
                   break
        elif option == 2:
            print ("You select option 1 Moby Dick (1851)- £15.20")
            cont = input('Enter Y to add another option or N to finish: ')
            def dis10(option, dis):
                option = 13.14
                dis = option * 0.1
                dis10 = option - dis
            if cont == "N":
               exit
            elif cont == "Y":
               menu = 3
            else:
                   break
        elif option == 3:
            print ("You select option 1 Moby Dick (1851)- £15.20")
            cont = input('Enter "Y" to add another option or "N" to finish: ')
            if cont == "N":
               exit
            elif cont == "Y":
               menu = 3
            else:
                   break
        elif option == 4:
            print ("You select option 1 Moby Dick (1851)- £15.20")
            cont = input('Enter "Y" to add another option or "N" to finish: ')
            if cont == "N":
               exit
            elif cont == "Y":
               menu = 3
            else:
                   break
        elif option == 5:
            print ("You select option 1 Moby Dick (1851)- £15.20")
            cont = input('Enter "Y" to add another option or "N" to finish: ')
            if cont == "N":
               exit
            elif cont == "Y":
               menu = 3
            else:
                   break
        elif option == 6:
            print ("You select option 1 Moby Dick (1851)- £15.20")
            cont = input('Enter "Y" to add another option or "N" to finish: ')
            if cont == "N":
               exit
            elif cont == "Y":
               menu = 3
            else:
                   break
        elif option == 7:
            print ("You select option 1 Moby Dick (1851)- £15.20")
            cont = input('Enter "Y" to add another option or "N" to finish: ')
            if cont == "N":
               exit
            elif cont == "Y":
               menu = 3
            else:
                   break
        elif option == 8:
            print ("You select option 1 Moby Dick (1851)- £15.20")
            cont = input('Enter "Y" to add another option or "N" to finish: ')
            if cont == "N":
               exit
            elif cont == "Y":
               menu = 3
            else:
                   break
        if option == 9:
            print ("You select option 1 Moby Dick (1851)- £15.20")
            cont = input('Enter "Y" to add another option or "N" to finish: ')
            if cont == "N":
               exit
            elif cont == "Y":
               menu = 3
            else:
                   break
        elif option == 10:
            print ("You select option 1 Moby Dick (1851)- £15.20")
            cont = input('Enter "Y" to add another option or "N" to finish: ')
            if cont == "N":
               exit
            elif cont == "Y":
               menu = 3
            else:
                   break
        elif option == 11:
            print ("You select option 1 Moby Dick (1851)- £15.20")
            cont = input('Enter "Y" to add another option or "N" to finish: ')
            if cont == "N":
               exit
            elif cont == "Y":
               menu = 3
            else:
                   break
def totaldis(total_amount, totaldis):
    totaldis = total_amount - 

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