How to Write a Python Program to Remove Duplicate Values from a List

If you've ever worked with lists in Python, you've likely encountered the need to eliminate duplicate values from a list. 

Duplicates can clutter your data and make it difficult to perform meaningful operations. 

In this blog post, we'll walk you through the process of writing a Python program that defines a function to remove duplicate values from a list. 

Python Program to Remove Duplicate Values from a List

By the end of this article, you'll have a clear understanding of the concept and be able to implement it in your own Python projects.

Table of Contents: Remove Duplicate Values from a Python List

  • Understanding the Problem
  • Writing the Python Program
  • Explanation of the Program Code
  • Concept Used to Solve the Problem
  • Multiple Choice Questions (MCQs)

Understanding the Problem: Write a program that defines a function to return a new list by eliminating the duplicate values in the list.  

Before we dive into the code, let's understand the problem. 

Given a list with duplicate values, our goal is to create a new list that contains only the unique values from the original list. 

To achieve this, we'll write a Python program that defines a function to perform this task efficiently.

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Writing the Python Program:

Here's the Python program that eliminates duplicate values from a list:

def remove_duplicates(input_list):

    unique_list = []

    for item in input_list:

        if item not in unique_list:


    return unique_list

# Example usage:

original_list = [1, 2, 2, 3, 4, 4, 5]

result_list = remove_duplicates(original_list)

print("Original List",original_list)

print("New List",result_list)

Original List [1, 2, 2, 3, 4, 4, 5]
New List [1, 2, 3, 4, 5]

Explanation of the Program Code:

- We define a function remove_duplicates that takes an input list as its argument.
- Inside the function, we initialize an empty list called unique_list to store unique values.
- We iterate through each item in the input_list.
- For each item, we check if it's not already in the unique_list.
- If it's not in the list, we append it to the unique_list.
- Finally, we return the unique_list containing only the unique values.

Concept Used to Solve the Problem:

- The key concept used in this program is the usage of a for loop to iterate through the elements of the input list and an if statement to check for duplicates before adding them to the new list.

Multiple Choice Questions (MCQs): Duplicate Python List

a) What is the purpose of the remove_duplicates function? To add duplicates to a list. To eliminate duplicate values from a list. To sort a list in ascending order. To count the number of duplicates in a list. b) Which data structure is used to store the unique values in the program? Set Dictionary Tuple List
In this blog post, we've learned how to write a Python program that removes duplicate values from a list. We've explained the program's code, the concept used to solve the problem, and even included some multiple-choice questions to test your understanding. This knowledge will be invaluable when working with lists in Python, as it allows you to efficiently manage and manipulate your data.

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