bpo-43916: Apply Py_TPFLAGS_DISALLOW_INSTANTIATION to selected types (GH-25748)
Apply Py_TPFLAGS_DISALLOW_INSTANTIATION to the following types:
* _dbm.dbm
* _gdbm.gdbm
* _multibytecodec.MultibyteCodec
* _sre..SRE_Scanner
* _thread._localdummy
* _thread.lock
* _winapi.Overlapped
* array.arrayiterator
* functools.KeyWrapper
* functools._lru_list_elem
* pyexpat.xmlparser
* re.Match
* re.Pattern
* unicodedata.UCD
* zlib.Compress
* zlib.Decompress
diff --git a/Lib/test/test_functools.py b/Lib/test/test_functools.py
index fba9281..3320ab7 100644
--- a/Lib/test/test_functools.py
+++ b/Lib/test/test_functools.py
@@ -948,6 +948,12 @@ class TestCmpToKeyC(TestCmpToKey, unittest.TestCase):
if c_functools:
cmp_to_key = c_functools.cmp_to_key
+ @support.cpython_only
+ def test_disallow_instantiation(self):
+ # Ensure that the type disallows instantiation (bpo-43916)
+ tp = type(c_functools.cmp_to_key(None))
+ self.assertRaises(TypeError, tp)
+
class TestCmpToKeyPy(TestCmpToKey, unittest.TestCase):
cmp_to_key = staticmethod(py_functools.cmp_to_key)