# How Find the Missing Number in Python

In this tutorial, we will program 'How to Find the Missing Number in Python'. We will learn how to find the missing number within an array list. The main goal here is to create a program that can actually find and locate the exact missing number. I will provide a sample program to demonstrate the actual coding of this tutorial.

This topic is very easy to understand; just follow the instructions I provide, and you can also do it yourself with ease. The program I will show you covers the basics of programming for finding the missing number. I will do my best to provide you with the easiest way for locating and displaying the missing number. So, let's start with the coding.

## Getting Started:

First you will have to download & install the Python IDLE's, here's the link for the Integrated Development And Learning Environment for Python https://www.python.org/downloads/.

## Creating Main Function

This is the main function of the application. The following code will display a simple GUI in terminal console that will display program. To do this, simply copy and paste these blocks of code into the IDLE text editor.
`def findMissingNumbers(n):    numbers = set(n)    length = len(n)    output = []    for i in range(1, n[-1]):        if i not in numbers:            output.append(i)    return output numbers = [1, 2, 3, 4, 6, 7, 8, 9, 10, 12, 13, 15, 16] ret = False  while True:    print("\n================== Find the Missing Number ==================\n\n")     print("List of numbers: ", numbers)     print("\nMissing numbers: ", findMissingNumbers(numbers))       opt = input("\nDo you want to try again?(yes/no): ")     if opt.lower() == 'yes':        ret=False    elif opt.lower() == 'no':        ret=True        print("Exiting program....")     else:        print("Please enter yes/no:")        break     if ret == False:        continue`

This Python script defines a function findMissingNumbers that takes a list of numbers n and returns a list of missing numbers within a given range. It then initializes a list of numbers numbers, calls the findMissingNumbers function on it, and prints the list of missing numbers. Finally, it prompts the user if they want to try again or exit the program.

## Output:

The How Find the Missing Number in Python source code that I provide can be download below. Please kindly click the download button.

There you have it we successfully created How Find the Missing Number in Python. I hope that this simple tutorial help you to what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!

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