Jim Jewett <jimjjew...@gmail.com> added the comment:

On Fri, Apr 6, 2012 at 4:03 PM,
 Daniel Stutzbach <stutzb...@google.com> added the comment:

>> __del__ methods do run, even if an object was collected by the cycle
>> detector.  And they can't do any harm that couldn't also be done by a C
>> finalizer.

> No, if an object with a __del__ method is part of a cycle, it is not
> collected.  The objects get appended to gc.garbage instead.

> See:  http://docs.python.org/py3k/library/gc.html#gc.garbage

They can still be collected if there is only one object with a __del__
method in the cycle.

(Whether the code actually does that, it appears not to at the moment,
and I won't swear by by own memory of 2.3 era code.)

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<http://bugs.python.org/issue9141>
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