gh-136523: fix wave.Wave_write emitting an unraisable when open raises

Lib/test/test_wave.py

@@ -1,6 +1,7 @@
 import unittest
 from test import audiotests
 from test import support
+from test.support import os_helper
 import io
 import struct
 import sys
@@ -196,6 +197,17 @@ def test_read_wrong_sample_width(self):
         with self.assertRaisesRegex(wave.Error, 'bad sample width'):
             wave.open(io.BytesIO(b))
 
+    def test_write_to_protected_location(self):
+        # gh-136523: Wave_write.__del__ should not throw
+        with support.catch_unraisable_exception() as cm:
+            try:
+                with os_helper.temp_dir() as path:
+                    wave.open(path, "wb")
+            except IsADirectoryError:
+                pass
+            support.gc_collect()
+            self.assertIsNone(cm.unraisable)
+
 
 if __name__ == '__main__':
     unittest.main()

Lib/wave.py

@@ -427,6 +427,8 @@ class Wave_write:
     _datawritten -- the size of the audio samples actually written
     """
 
+    _file = None
+
     def __init__(self, f):
         self._i_opened_the_file = None
         if isinstance(f, str):

Misc/NEWS.d/next/Library/2025-07-11-03-39-15.gh-issue-136523.s7caKL.rst

@@ -0,0 +1 @@
+Fix :class:`wave.Wave_write` emitting an unraisable :exc:`AttributeError` when attempting to open an unwritable file.