style: apply ruff formatting

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: sullivanj91

src/pdex/__init__.py

@@ -530,7 +530,11 @@ def _pdex_on_target(
         fc = float(
             fold_change(np.array([target_mean]), np.array([ref_mean]), prior_count)[0]
         )
-        pc = float(percent_change(np.array([target_mean]), np.array([ref_mean]), prior_count)[0])
+        pc = float(
+            percent_change(np.array([target_mean]), np.array([ref_mean]), prior_count)[
+                0
+            ]
+        )
 
         mwu_result = mwu(group_col, ref_col)
         p_value = float(np.clip(np.asarray(mwu_result.pvalue).ravel()[0], 0, 1))

src/pdex/_math.py

@@ -117,7 +117,9 @@ def fold_change(x: np.ndarray, y: np.ndarray, prior_count: float = 0.0) -> np.nd
 
 
 @nb.njit(parallel=True)
-def percent_change(x: np.ndarray, y: np.ndarray, prior_count: float = 0.0) -> np.ndarray:
+def percent_change(
+    x: np.ndarray, y: np.ndarray, prior_count: float = 0.0
+) -> np.ndarray:
     """Calculates the percent change between two arrays.
 
     When ``prior_count > 0``, adds a pseudocount to the denominator before

tests/test_math.py

@@ -100,7 +100,9 @@ def test_dampens_extreme_pc_from_near_zero_denominator(self):
         pc_raw = percent_change(x, y)[0]
         pc_dampened = percent_change(x, y, 0.5)[0]
         assert abs(pc_dampened) < abs(pc_raw)
-        np.testing.assert_allclose(pc_dampened, (0.1 - 0.001) / (0.001 + 0.5), rtol=1e-5)
+        np.testing.assert_allclose(
+            pc_dampened, (0.1 - 0.001) / (0.001 + 0.5), rtol=1e-5
+        )
 
     def test_preserves_direction(self):
         """prior_count should not flip the sign of percent change."""