python code for heap using heapify

1#Implementing Heap Using Heapify Method in Python 3
2#MaxHeapify,MinHeapify,Ascending_Heapsort,Descending_Heapsort
3class heap:
4    
5    def maxheapify(self,array):
6        n=len(array)
7        for i in range(n//2-1,-1,-1):
8            self._maxheapify(array,n,i)
9            
10            
11    def _maxheapify(self,array,n,i):
12        l=2*i+1
13        r=2*i+2
14        if l<n and array[l]>array[i]:
15            largest=l
16        else:
17            largest=i
18        if r<n and array[r]>array[largest]:
19            largest=r
20        if (largest!=i):
21            array[largest],array[i]=array[i],array[largest]
22            self._maxheapify(array,n,largest)
23            
24            
25    def minheapify(self,array):
26        n = len(array)
27        for i in range(n//2-1,-1,-1):
28            self._minheapify(array,n,i)
29            
30            
31    def _minheapify(self,array,n,i):
32        l=2*i+1
33        r=2*i+2
34        if l<n and array[l]<array[i]:
35            smallest = l
36        else:
37            smallest = i
38        if r < n and array[r]<array[smallest]:
39            smallest = r
40        if (smallest != i):
41            array[smallest], array[i] = array[i], array[smallest]
42            self._minheapify(array, n, smallest)
43            
44            
45    def descending_heapsort(self,array):
46        n = len(array)
47        for i in range(n // 2 - 1, -1, -1):
48            self._minheapify(array, n, i)
49        for i in range(n - 1, 0, -1):
50            array[0], array[i] = array[i], array[0]
51            self._minheapify(array, i, 0)
52
53
54    def ascending_heapsort(self,array):
55        n=len(array)
56        for i in range(n//2-1,-1,-1):
57            self._maxheapify(array,n,i)
58        for i in range(n-1,0,-1):
59            array[0],array[i]=array[i],array[0]
60            self._maxheapify(array,i,0)
61
62b=[550,4520,3,2340,12]
63a=heap()
64
65a.maxheapify(b)
66print('Max Heapify -->',b)
67
68a.minheapify(b)
69print('Min Heapify -->',b)
70
71a.ascending_heapsort(b)
72print('Ascending Heap Sort -->',b)
73
74a.descending_heapsort(b)
75print('Descending Heap Sort -->',b)