This function will actually calculate and check if the given number is an Armstrong number or not. If this function returns True for a number , that number will be added to the Armstrong numbers list, otherwise skipped. Now that we know the basic structure of the code, let us see a few different ways to find all the Armstrong numbers in an Interval. In this post, we learn how to write a python program to check for Armstrong numbers with a detailed explanation but before writing the program let’s understand what is Armstrong number . Learn to check Armstrong numbers in Python using simple methods. Step-by-step examples with full code and clear explanations to verify Armstrong numbers easily. Explore Armstrong numbers : definitions, Python methods, and applications in math, programming, and cryptography for all levels.