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def heapify(arr, n, i): 
    largest = i  
    l = 2 * i + 1     # left = 2*i + 1 
    r = 2 * i + 2     # right = 2*i + 2 

    if l < n and arr[i] < arr[l]: 
        largest = l 

    if r < n and arr[largest] < arr[r]: 
        largest = r 

    if largest != i: 
        arr[i],arr[largest] = arr[largest],arr[i]  # Swap

        heapify(arr, n, largest) 

def heapSort(arr): 
    n = len(arr) 

    # Build a maxheap. 
    for i in range(n, -1, -1): 
        heapify(arr, n, i) 

    # Swap elements one by one
    for i in range(n-1, 0, -1): 
        arr[i], arr[0] = arr[0], arr[i]   # Swap
        heapify(arr, i, 0) 

arr = [ 12, 11, 13, 5, 6, 7] 
heapSort(arr) 
n = len(arr) 
print ("Sorted array") 
for i in range(n): 
    print ("%d" %arr[i]),

Sorted array
5
6
7
11
12
13