quicksort in python site 3astackoverflow com

1def sort(array=[12,4,5,6,7,3,1,15]):
2    less = []
3    equal = []
4    greater = []
5
6    if len(array) > 1:
7        pivot = array[0]
8        for x in array:
9            if x < pivot:
10                less.append(x)
11            if x == pivot:
12                equal.append(x)
13            if x > pivot:
14                greater.append(x)
15            sort(less)
16            sort(pivot)
17            sort(greater)