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Code Listing by Antoine Pitrou

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The well-known way to avoid __del__ (and its problems when the object to be deleted is involved in a reference cycle) is to use a finalization callback on a weakref.

This recipe simply makes it easier to write such "finalizable" objects by allowing to write the finalizer as a __finalize__ method (a bit similar to a __del__ method, but not exactly as we'll see).

The first step is to call the...