Armstrong Number Checking

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In number theory, an Armstrong number (after Michael F. Armstrong) or narcissistic number in a given number base (10 for this mission) is a number that is the sum of its own digits each raised to the power of the number of digits. For example, 153 is an Armstrong number because 1³ + 5³ + 3³ == 153.

example

Input: Integer (int).

Output: Logic value (bool).

Examples:

assert is_armstrong(153) == True
assert is_armstrong(370) == True
assert is_armstrong(947) == False
assert is_armstrong(371) == True

How it’s used: this function can be employed in mathematical puzzles, encryption algorithms, and educational tools.

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