Make isinstance(OldstyleClass, NewstyleClass) return False instead of raising
an exception. Issue reported by Joseph Armbruster.
diff --git a/Lib/test/test_abc.py b/Lib/test/test_abc.py
index f1c0c3b..8fed220 100644
--- a/Lib/test/test_abc.py
+++ b/Lib/test/test_abc.py
@@ -70,6 +70,17 @@
self.assertFalse(issubclass(OldstyleClass, A))
self.assertFalse(issubclass(A, OldstyleClass))
+ def test_isinstance_class(self):
+ class A:
+ __metaclass__ = abc.ABCMeta
+ class OldstyleClass:
+ pass
+ self.assertFalse(isinstance(OldstyleClass, A))
+ self.assertTrue(isinstance(OldstyleClass, type(OldstyleClass)))
+ self.assertFalse(isinstance(A, OldstyleClass))
+ # This raises a recursion depth error, but is low-priority:
+ # self.assertTrue(isinstance(A, abc.ABCMeta))
+
def test_registration_basics(self):
class A:
__metaclass__ = abc.ABCMeta