Issue #3680: Reference cycles created through a dict, set or deque iterator did not get collected.
diff --git a/Lib/test/test_deque.py b/Lib/test/test_deque.py
index 0f0d098..4e2de3d 100644
--- a/Lib/test/test_deque.py
+++ b/Lib/test/test_deque.py
@@ -1,7 +1,8 @@
from collections import deque
import unittest
from test import test_support, seq_tests
-from weakref import proxy
+import gc
+import weakref
import copy
import cPickle as pickle
import random
@@ -418,6 +419,22 @@
d.append(1)
gc.collect()
+ def test_container_iterator(self):
+ # Bug # XXX: tp_traverse was not implemented for deque iterator objects
+ class C(object):
+ pass
+ for i in range(2):
+ obj = C()
+ ref = weakref.ref(obj)
+ if i == 0:
+ container = deque([obj, 1])
+ else:
+ container = reversed(deque([obj, 1]))
+ obj.x = iter(container)
+ del obj, container
+ gc.collect()
+ self.assert_(ref() is None, "Cycle was not collected")
+
class TestVariousIteratorArgs(unittest.TestCase):
def test_constructor(self):
@@ -528,7 +545,7 @@
def test_weakref(self):
d = deque('gallahad')
- p = proxy(d)
+ p = weakref.proxy(d)
self.assertEqual(str(p), str(d))
d = None
self.assertRaises(ReferenceError, str, p)