Is my implementation of quicksort efficient, in-place, pythonic ?

def quicksort(array, lo, hi):
    if hi - lo < 2:
        return
    key = random.randrange(lo, hi)
    array[key], array[lo] = array[lo], array[key]
    y = 1 + lo
    for x in xrange(lo + 1, hi):
        if array[x] <= array[lo]:
            array[x], array[y] = array[y], array[x]
            y += 1
    array[lo], array[y - 1] = array[y - 1], array[lo]
    quicksort(array, lo, y - 1)
    quicksort(array, y, hi)


a = map(int, raw_input().split())
quicksort(a, 0, len(a))