first attempt at a bubble sort

bubble_sort.py

def bubble_sort(l):
    # keep track of if we did any swapping
    swapped = False
    # loop over all elements in list
    for i in xrange(0, len(l), 1):
        # look at this item and the next and see if they need to swap
        if i != len(l) - 1:
            if l[i] > l[i + 1]:
                l[i], l[i + 1] = l[i + 1], l[i]
                swapped = True
    # if we didn't do any swapping we know we are done, otherwise run another pass
    return l if not swapped else bubble_sort(l)

if __name__ == '__main__':
    print(bubble_sort([1, 12, 4, 7, 3, 5, 2, 6, 11, 10, 9, 13, 8]))