human
Solve the following python programming problem given the following code:
def quick_sort(items, low = None, high = None) : 
    def partition(items, low, high) : 
        pivot_index = ((low + high) / 2) 
        pivot_value = items [pivot_index] 
        items = swap_item (items, pivot_index, high) 
        store_index = low 
        for k in range (low, high) : 
            if (items [k] < pivot_value) : 
                items = swap_item (items, k, store_index) 
                store_index += 1 
items = swap_item (items, store_index, high) 
        return store_index 
num_items = len (items) 
    if (len (items) < 2) : 
        return items 
if (low is None) : 
        low = 0 
if (high is None) : 
        high = (num_items - 1) 
if (low < high) : 
        partitioned = partition (items, low, high) 
        quick_sort (items, low = low, high = (low - 1)) 
        quick_sort (items, low = (partitioned + 1), high = high) 
return items 

    
    

    Fix the buggy line: quick_sort (items, low = low, high = (low - 1))
assistant
#Here is Python code to fix the buggy line: quick_sort (items, low = low, high = (low - 1))
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quick_sort (items, low = low, high = (partitioned - 1))