Remove code for Python < 3.9

Author: cyyever

setup.py

@@ -141,7 +141,7 @@
 AUDIO_REQUIRE = [
     "soundfile>=0.12.1",
     "librosa",
-    "soxr>=0.4.0; python_version>='3.9'",  # Supports numpy-2
+    "soxr>=0.4.0",  # Supports numpy-2
 ]
 
 VISION_REQUIRE = [

tests/test_arrow_dataset.py

@@ -3142,12 +3142,11 @@ def test_tf_dataset_options(self, in_memory):
             self.assertEqual(len(tf_dataset), 2)  # One batch of 3 and one batch of 1
             self.assertEqual(len(tf_dataset_with_drop), 1)  # Incomplete batch of 1 is dropped
         # Test that `NotImplementedError` is raised `batch_size` is None and `num_workers` is > 0
-        if sys.version_info >= (3, 8):
-            with self._create_dummy_dataset(in_memory, tmp_dir.name, multiple_columns=True) as dset:
-                with self.assertRaisesRegex(
-                    NotImplementedError, "`batch_size` must be specified when using multiple workers"
-                ):
-                    dset.to_tf_dataset(columns="col_1", batch_size=None, num_workers=2)
+        with self._create_dummy_dataset(in_memory, tmp_dir.name, multiple_columns=True) as dset:
+            with self.assertRaisesRegex(
+                NotImplementedError, "`batch_size` must be specified when using multiple workers"
+            ):
+                dset.to_tf_dataset(columns="col_1", batch_size=None, num_workers=2)
         del tf_dataset  # For correct cleanup
         del tf_dataset_with_drop