[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

maths/armstrong_number.py

@@ -9,7 +9,7 @@ def is_armstrong(number: int) -> bool:
     """
     digits = list(map(int, str(number)))
     power = len(digits)
-    return sum(d ** power for d in digits) == number
+    return sum(d**power for d in digits) == number
 
 
 if __name__ == "__main__":