[Python-ideas] breaking cycles that include __del__

Daniel Stutzbach daniel at stutzbachenterprises.com
Tue Oct 20 18:58:36 CEST 2009

I'm playing around with this, and in following variant the weakref callback
is never called (in Python 2.6 and 3.1).  I do not see why.  I know I've
created a cycle between the callback and the object itself, but the garbage
collector should detect and free the cycle.

import weakref, gc
class Foo:
    def __init__(self):
        self._weakref = weakref.ref(self, self.__free__)
    def __free__(self):
        print("I'm free!")
x = Foo()
del x

Daniel Stutzbach, Ph.D.
President, Stutzbach Enterprises, LLC <http://stutzbachenterprises.com>
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