Show case: reference cycles involving only the ob_type field are rather

uncommon but possible. Inspired by SF bug 1469629.

Show case: reference cycles involving only the ob_type field are rather
uncommon but possible. Inspired by SF bug 1469629.
32128ff9 · Armin Rigo · 3b883459 · 32128ff9
Commit 32128ff9 authored Apr 14, 2006 by Armin Rigo
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Lib/test/leakers/test_selftype.py Lib/test/leakers/test_selftype.py +13 -0

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--- a/Lib/test/leakers/test_selftype.py
+++ b/Lib/test/leakers/test_selftype.py
+# Reference cycles involving only the ob_type field are rather uncommon
+# but possible.  Inspired by SF bug 1469629.
+
+import gc
+
+def leak():
+    class T(type):
+        pass
+    class U(type):
+        __metaclass__ = T
+    U.__class__ = U
+    del U
+    gc.collect(); gc.collect(); gc.collect()