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Showing content from https://mail.python.org/pipermail/python-dev/2007-May/073447.html below:

[Python-Dev] nodef

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From: "Greg Ewing" 
> If the aforementioned iterable can yield *anything*,
> then it might yield this 'nodef' value as well.
> 
> For this reason, there *can't* exist any *standard*
> guaranteed-unambiguous sentinel value. Each use
> case needs its own, to ensure it's truly unambiguous
> in the context of that use case.

Right.

That's why Barry and others write:

missing = object()
v = d.get(k, missing)

That is the guaranteed way to get a unique object.


Raymond

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