Apply ruff==0.9.0 formatting (#13486)

* Refactor code for speed and clarity

* Auto-format by https://ultralytics.com/actions

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Co-authored-by: UltralyticsAssistant <web@ultralytics.com>

utils/segment/augmentations.py

@@ -69,16 +69,8 @@ def random_perspective(
         else:  # affine
             im = cv2.warpAffine(im, M[:2], dsize=(width, height), borderValue=(114, 114, 114))
 
-    # Visualize
-    # import matplotlib.pyplot as plt
-    # ax = plt.subplots(1, 2, figsize=(12, 6))[1].ravel()
-    # ax[0].imshow(im[:, :, ::-1])  # base
-    # ax[1].imshow(im2[:, :, ::-1])  # warped
-
-    # Transform label coordinates
-    n = len(targets)
     new_segments = []
-    if n:
+    if n := len(targets):
         new = np.zeros((n, 4))
         segments = resample_segments(segments)  # upsample
         for i, segment in enumerate(segments):