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

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

Author: pre-commit-ci[bot]

maths/special_numbers/kaprekar_number.py

@@ -1,5 +1,6 @@
 import math
 
+
 def is_kaprekar_number(n: int) -> bool:
     """
     Determine whether a number is a Kaprekar number (excluding powers of 10).
@@ -29,7 +30,7 @@ def is_kaprekar_number(n: int) -> bool:
     if n <= 0 or math.log10(n).is_integer():
         return False  # Disallow powers of 10 (e.g., 10, 100, 1000)
 
-    square = str(n ** 2)
+    square = str(n**2)
     for i in range(1, len(square)):
         left, right = square[:i], square[i:]
         if n == int(left or "0") + int(right):

tests/special_numbers/test_kaprekar_number.py

@@ -1,5 +1,6 @@
 from maths.special_numbers.kaprekar_number import is_kaprekar_number
 
+
 def test_kaprekar_numbers():
     assert is_kaprekar_number(1) is True
     assert is_kaprekar_number(9) is True
@@ -8,6 +9,7 @@ def test_kaprekar_numbers():
     assert is_kaprekar_number(99) is True
     assert is_kaprekar_number(297) is True
 
+
 def test_non_kaprekar_numbers():
     assert is_kaprekar_number(10) is False  # Power of 10
     assert is_kaprekar_number(100) is False  # Power of 10