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

Sounds like some index notation is required here:

>>> def swap_cards(L, n):
...     if len(L) == n + 1:
...         L[n], L[0] = L[0], L[n]
...         return L
...     L[n], L[n+1] = L[n+1], L[n]
...     return L
... 
>>> swap_cards([3, 2, 1, 4, 5, 6, 0], 5)
[3, 2, 1, 4, 5, 0, 6]
>>> swap_cards([3, 2, 1, 4, 5, 6, 0], 6)
[0, 2, 1, 4, 5, 6, 3]