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About the implementation of del in Python 3

Steve D'Aprano <steve+python at pearwood.info>:

> But the Python virtual machine doesn't require objects to have an
> address at all.

That's an interesting question. Is it possible to define formal
semantics for Python without the notion of an address (under some name)?
Ultimately it seems necessary to have an enumerable set (address space)
that maps to objects.