Message 129798 - Python tracker

Raymond: I don't think this matters. We don't need a canonical `.__parent_class__`, we just need to know where that function is defined so we could find it when unpickling. In the example that you gave, `f` would have a `.__parent_class__` of `None`, and it would be pickleable because it would be found on the top-level of the module it's defined on.