Check Duplicate Values using Python

The duplicate values problem is a popular coding interview question. Here we need to check if any value appears at least twice in an array. So, if you want to know how to solve this problem using Python, this article is for you. This article will take you through how to check duplicate values using Python.

Check Duplicate Values using Python

In the problem of checking duplicate values, you will be given an array of integers. You need to check if any value appears more than once. Below is an example of the input and output of this problem:

Input: [1, 2, 3, 1]
Output: True

I hope you have understood what the problem of duplicate values means. Now, below is how to solve this problem using the Python programming language:

def containsDuplicate(nums):
    for i in range(len(nums)):
        for j in range(i + 1, len(nums)):
            if nums[i] == nums[j]:
                return True
    else:
        return False

nums = [1,2,3,1]
print(containsDuplicate(nums))

Output: True

So this is how you can check duplicate values using Python. You can find many more practice questions for coding interviews solved and explained using Python here.

Summary

In the problem of checking duplicate values, you will be given an array of integers. You need to check if any value appears more than once. I hope you liked this article on how to validate duplicate values using Python. Feel free to ask valuable questions in the comments section below.