The Single Number problem is one of the popular coding interview **questions**. Here you will be given an array of integers where each item appears twice except for one that we need to find. So, if you want to know how to solve this problem, this article is for you. In this article, I will take you through how to solve the Single Number problem using **Python**.

## Solving the Single Number Problem using Python

In the Single Number problem, you will be given an array of integers where every item appears twice except for one. To solve this problem, we need to find that one single element.

For example, have a look at the input and output of this problem below:

*Input: [4,1,2,1,2]**Output: 4*

I hope you now have understood what the single number problem is all about. Now, below is how you can find the only single number from an array using the Python programming language:

def singleNumber(nums): count = 0 for i in nums: count = count^i return count nums = [4, 1, 2, 1, 2] print(singleNumber(nums))

Output: 4

I hope you now know how to solve the Single Number problem using Python. You can find many more practice questions to improve your problem-solving skills using Python **here**.

### Summary

In the single number problem, you will be given an array of integers where every element appears twice except for one. To solve this problem, we need to find that one single element. I hope you liked this article on solving the single number problem. Feel free to ask valuable questions in the comments section below.