Quick Sort - Python

quicksort.py

def quicksort(array, first, last):
    if first < last :
        pivot = array[first]
        left = first + 1
        right = last
        while 1 :
            while left <= right and array[left] <= pivot : 
                left += 1
            while right >= left and array[right] >= pivot :
                right -= 1
            if right < left : break
            temp = array[left]
            array[left] = array[right]
            array[right] = temp
        array[first] = array[right]
        array[right] = pivot
        quicksort(array, first, right - 1)
        quicksort(array, right + 1, last)

test = [21, 4, 1, 3, 9, 20, 25, 6, 21, 14]
quicksort(test, 0 , len(test)-1)
print test