Quicksort with Python

def sort(array=[12,4,5,6,7,3,1,15]):
    """Sort the array by using quicksort."""

    less = []
    equal = []
    greater = []

    if len(array) > 1:
        pivot = array[0]
        for x in array:
            if x < pivot:
            elif x == pivot:
            elif x > pivot:
        # Don't forget to return something!
        return sort(less)+equal+sort(greater)  # Just use the + operator to join lists
    # Note that you want equal ^^^^^ not pivot
    else:  # You need to handle the part at the end of the recursion - when you only have one element in your array, just return the array.
        return array

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