How do you remove duplicates from an array?

 In python it is simple program

list = [1,3,4,6,3,1,8,9,6] 
print ("The original list is : " + str(list)) 
list1 = [] 
for i in list: 
if i not in list1: 
list.append(i) 
print ("The list after removing duplicates : " + str(list1)) 

Output:

The original list is : [1,3,4,6,3,1,8,9,6] 
The list after removing duplicates : [1,2,4,6,8,9]