Python Swap Function

Question

I\'m having a hard time expressing this in Python.

This is the description of what needs to be done.

swap_cards: (list of int, int) -> NoneType

Answer 1

def swap_cards(deck, index):
    if index in range(0, len(deck)):
        factor = (index + 1) % len(deck)
        aux = deck[factor]
        deck[factor] = deck[index]
        deck[index] = aux
        return deck
    else:
        return None

deck = [3, 2, 1, 4, 5, 6, 0]

new_deck = swap_cards(deck, 6)

print new_deck

Output:

[0, 2, 1, 4, 5, 6, 3]