Thanks for the proposal.  At first glance I actually kind of like the idea, though I can't offer much more feedback than that without taking some time to think it through. :)

That said, proposals like this for new syntax and other new language features are best suited for the python-ideas@python.org mailing list. [1]  I recommend you make a post there.  I'm closing the issue as "rejected" because it belongs on python-ideas instead of here, not because we're rejecting the idea. :)

Thanks again!  I hope you post something about this to python-ideas.

[1] https://mail.python.org/mailman/listinfo/python-ideas