Paul Moore wrote:

Again, obvious. But you still haven't given any reason why we would want to do that. No-one's arguing that these things aren't possible, or that the proposals can't be implemented. What I'm asking, and you aren't answering, is what is the use case? When, in real world code, would this be used?

The canonical answer to this question is
https://www.python.org/dev/peps/pep-0472/#use-cases

I'd like the examples there to be expanded and improved upon. To help support this I've created https://pypi.org/project/kwkey/, which emulates in today's Python the proposed enhancement. I'd like us to write code now that can use the enhancement, if and when it arrives.

By the way, thank you Paul and your colleagues for your work on creating and developing pip. It's one of our most important tools.

I'm all for having real-world use cases, and where possible working solutions, as a key part of the discussion. I admit that there has been a past deficiency here. I hope that we will correct this soon. For my part, I'm working on an enhanced kwkey, which will provide a wider range of emulation.

-- 
Jonathan