Program to find duplicate element from a list in Python

In this python article, we are going to learn

• program to find the duplicate element in a list in python

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Program to find duplicate element from a list in Python

The program is as follows:

 

# Owner : TutorialsInhand Author : Devjeet Roy

marks = [22,66,43,58,98,42,77,56,66]

unique_marks = list()

for i in marks:
    if i not in unique_marks:
        unique_marks.append(i)
    else:
        print("The duplicated element is:",i)
        break

The output of the program is:

 

PS C:\Users\DEVJEET\Desktop\tutorialsInHand> python code.py
The duplicated element is: 66

Few important tips about the program

1. In the given program, we iterate upon the given list and see if it is already present in the newly created list. If the element is not present, we insert that element into the list.

2. Else we consider it to be the duplicated element.