books  = [("Dan brown", "Davinci Code"), ("Bram Stoker", "Dracula"), ("Murakami", "Tokio Blues")]


def a():
    index = 1
    for item in books:
        author, book = item

        print(f"{index}: {book} by {author}")

        index += 1 


def b():

    for i in range(len(books)):
        author, book = books[i]

        print(f"{i + 1}: {book} by {author}")


def c():
    for index, (author, book) in enumerate(books, 1):
        print(f"{index}: {book} by {author}")


# To execute
funcs = (a, b, c)

for func in funcs:
    print("-" * 8)
    print(f"function: {func.__name__}")
    print("-" * 8)
    func()