How do I check duplicate elements present in an array?

 In Python It is a simple program, Let see step by step.

Steps:    

• Firstly initialize a list1 with the duplicate elements.

• initialize an empty list2.

• Take a for loop for list1.

• check if the list1 element is not in list2 then append the element of list1 into list2.

   

 Let’s See an example of it:

      

# Using naive method 
list1=[1,2,3,1,3,4,5,6,7,3,4,6,7] 
print("original list is: " +str(list1)) 
list2=[] 
for i in list1: 
if i not in list2: 
list2.append(i) 
print ("list after removing duplicates element is : " + str(list2)) 
 
# Using list comprehension method 
 
list1=[1,2,3,1,3,4,5,6,7,3,4,6,7] 
print("original list is: " +str(list1)) 
list2=[] 
[list2.append(i) for i in list1 if i not in list2] 
print("list after removing duplicates element is: " + str(list2))

 

Check my Quora Id where I have already discussed this question.