Fisher Yates Shuffling Algorithm

shuffle.py

import random
def shuffle(arr):
	for i in range(len(arr)-1,0,-1):
		temp = random.randint(0,i) #random integer N such that 0<=N<=i
		arr[i],arr[temp] = arr[temp],arr[i]

arr = [1,2,3,4,5,6]
shuffle(arr)
print(arr)