SF bug #1242657: list(obj) can swallow KeyboardInterrupt
Fix over-aggressive PyErr_Clear(). The same code fragment appears in
various guises in list.extend(), map(), filter(), zip(), and internally
in PySequence_Tuple().
diff --git a/Lib/test/list_tests.py b/Lib/test/list_tests.py
index 284edb3..14b54c7 100644
--- a/Lib/test/list_tests.py
+++ b/Lib/test/list_tests.py
@@ -514,3 +514,12 @@
a = self.type2test(range(10))
a[::2] = tuple(range(5))
self.assertEqual(a, self.type2test([0, 1, 1, 3, 2, 5, 3, 7, 4, 9]))
+
+ def test_constructor_exception_handling(self):
+ # Bug #1242657
+ class F(object):
+ def __iter__(self):
+ yield 23
+ def __len__(self):
+ raise KeyboardInterrupt
+ self.assertRaises(KeyboardInterrupt, list, F())