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 step-by-step how to write a Python program to find Armstrong numbers in an interval using loops, functions, and list comprehensions, and recursion. 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. Learn how to identify and check Armstrong numbers, which are numbers that equal the sum of their digits raised to a power. See Python code, logic, and examples for 3-digit and n-digit numbers.