Python, for all its power and popularity, has long lacked a form of flow control found in other languages—a way to take a value and match it elegantly against one of a number of possible conditions.

I also just realized that I sort of sketched the basics of "algebraic matching", where the original PEP completely bypassed that issue and (x, x) doesn't even do what seems obvious? Or am I reading ...

Changing variable scope to be anything other than the parent function/class/module declaration would be a massive change. Anything digging around in frame objects would need to learn to poke wherever ...