fix inspect.isclass() on instances with a custom __getattr__ #1225107

1 files changed, 12 insertions, 1 deletions

diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index b653f40..7312cac 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -65,7 +65,6 @@ class TestPredicates(IsTestBase):
     def test_excluding_predicates(self):
         self.istest(inspect.isbuiltin, 'sys.exit')
         self.istest(inspect.isbuiltin, '[].append')
-        self.istest(inspect.isclass, 'mod.StupidGit')
         self.istest(inspect.iscode, 'mod.spam.func_code')
         self.istest(inspect.isframe, 'tb.tb_frame')
         self.istest(inspect.isfunction, 'mod.spam')
@@ -91,6 +90,18 @@ class TestPredicates(IsTestBase):
         self.assert_(inspect.isroutine(mod.spam))
         self.assert_(inspect.isroutine([].count))
 
+    def test_isclass(self):
+        self.istest(inspect.isclass, 'mod.StupidGit')
+        self.assertTrue(inspect.isclass(list))
+
+        class newstyle(object): pass
+        self.assertTrue(inspect.isclass(newstyle))
+
+        class CustomGetattr(object):
+            def __getattr__(self, attr):
+                return None
+        self.assertFalse(inspect.isclass(CustomGetattr()))
+
     def test_get_slot_members(self):
         class C(object):
             __slots__ = ("a", "b")