using python WeakSet to enable a callback functionality

Question

I\'m investigating if I can implement an easy callback functionality in python. I thought I might be able to use weakref.WeakSet for this, but there is clearly something I\'

Answer 1

Try the following changes:

To update the WeakSet:

a1.destroyCallback.add(b)

so the WeakSet holds a reference to b.

Then in the __del__ method of ClassA, trigger the callback like this:

for f in self.destroyCallback:
        f.destroyedObjectListener(self)