Issue #22995: Instances of extension types with a state that aren't

subclasses of list or dict and haven't implemented any pickle-related
methods (__reduce__, __reduce_ex__, __getnewargs__, __getnewargs_ex__,
or __getstate__), can no longer be pickled.  Including memoryview.

1 files changed, 13 insertions, 0 deletions

diff --git a/Lib/test/test_memoryview.py b/Lib/test/test_memoryview.py
index d2bab38104..ddd5b9a8e2 100644
--- a/Lib/test/test_memoryview.py
+++ b/Lib/test/test_memoryview.py
@@ -11,6 +11,8 @@ import gc
 import weakref
 import array
 import io
+import copy
+import pickle
 
 
 class AbstractMemoryTests:
@@ -519,6 +521,17 @@ class OtherTest(unittest.TestCase):
         m2 = m1[::-1]
         self.assertEqual(m2.hex(), '30' * 200000)
 
+    def test_copy(self):
+        m = memoryview(b'abc')
+        with self.assertRaises(TypeError):
+            copy.copy(m)
+
+    def test_pickle(self):
+        m = memoryview(b'abc')
+        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+            with self.assertRaises(TypeError):
+                pickle.dumps(m, proto)
+
 
 if __name__ == "__main__":
     unittest.main()