quick sort algorithm python code example

Example 1: Quick Sort python

def partition(array, begin, end):
    pivot_idx = begin
    for i in xrange(begin+1, end+1):
        if array[i] <= array[begin]:
            pivot_idx += 1
            array[i], array[pivot_idx] = array[pivot_idx], array[i]
    array[pivot_idx], array[begin] = array[begin], array[pivot_idx]
    return pivot_idx

def quick_sort_recursion(array, begin, end):
    if begin >= end:
        return
    pivot_idx = partition(array, begin, end)
    quick_sort_recursion(array, begin, pivot_idx-1)
    quick_sort_recursion(array, pivot_idx+1, end)

def quick_sort(array, begin=0, end=None):
    if end is None:
        end = len(array) - 1
    
    return quick_sort_recursion(array, begin, end)

Example 2: quicksort in python

def partition(arr, low, high):
    i = (low-1)         
    pivot = arr[high]   
 
	for j in range(low, high):
        if arr[j] <= pivot:
 
            i = i+1
            arr[i], arr[j] = arr[j], arr[i]
 
    arr[i+1], arr[high] = arr[high], arr[i+1]
    return (i+1)
 
def quickSort(arr, low, high):
    if len(arr) == 1:
        return arr
    if low < high:
        pi = partition(arr, low, high)
 
		quickSort(arr, low, pi-1)
        quickSort(arr, pi+1, high)
 
arr = [10, 7, 8, 9, 1, 5]
n = len(arr)
quickSort(arr, 0, n-1)
print("Sorted array is:")
for i in range(n):
    print("%d" % arr[i]),

Example 3: quick sort algorithm in python

def quicksort(arr):
    if len(arr) <= 1:
        return arr
    pivot = arr[len(arr) // 2]
    left = [x for x in arr if x < pivot]
    middle = [x for x in arr if x == pivot]
    right = [x for x in arr if x > pivot]
    return quicksort(left) + middle + quicksort(right)

print(quicksort([3,6,8,10,1,2,1]))
# Prints "[1, 1, 2, 3, 6, 8, 10]"