Issue #9756: When calling a method descriptor or a slot wrapper descriptor, the
check of the object type doesn't read the __class__ attribute anymore. Fix a
crash if a class override its __class__ attribute (e.g. a proxy of the str
type).
diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
index bd88f45..aafe428 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -4235,6 +4235,22 @@
with self.assertRaises(AttributeError):
del X.__abstractmethods__
+ def test_proxy_call(self):
+ class FakeStr:
+ __class__ = str
+
+ fake_str = FakeStr()
+ # isinstance() reads __class__
+ self.assertTrue(isinstance(fake_str, str))
+
+ # call a method descriptor
+ with self.assertRaises(TypeError):
+ str.split(fake_str)
+
+ # call a slot wrapper descriptor
+ with self.assertRaises(TypeError):
+ str.__add__(fake_str, "abc")
+
class DictProxyTests(unittest.TestCase):
def setUp(self):