def swap(x, k, l):
    """x is a list, k, l are indices in the list"""
    x[k], x[l] = x[l], x[k]

def vandalize(n):
    n = 0
x = [1,2,3,4,5]
print(x)
swap(x, 1,4)
print(x)
n = 13
print(n)
vandalize(n)
print(n)