spark: add even_squares.py utility for filtering and squaring even numbers

wizard-work/spark/even_squares.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python3
+"""Filter even numbers and return their squares."""
+
+def even_squares(numbers):
+    """Given a list of integers, return squares of even numbers."""
+    return [n * n for n in numbers if n % 2 == 0]
+
+if __name__ == "__main__":
+    test_input = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+    result = even_squares(test_input)
+    expected = [4, 16, 36, 64, 100]
+    print(f"Input: {test_input}")
+    print(f"Result: {result}")
+    print(f"Expected: {expected}")
+    assert result == expected, f"Mismatch: {result} != {expected}"
+    print("PASS")