[Python] Quicksort with Python

I am totally new to python and I am trying to implement quicksort in it. Could someone please help me complete my code?

I do not know how to concatenate the three arrays and print them.

def sort(array=[12,4,5,6,7,3,1,15]):
less = []
equal = []
greater = []

if len(array) > 1:
pivot = array[0]
for x in array:
if x < pivot:
less.append(x)
if x == pivot:
equal.append(x)
if x > pivot:
greater.append(x)
sort(less)
sort(pivot)
sort(greater)

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