From their POV, inside the quotes, what you know about f-strings, you know here as well.
> ...other stuff that happens before evaluation...
A greet(string) function could parse the string and resolve the names itself:
parsed = parser(string)
resolved = resolver(parsed)
return formatter(resolved)
If you hate boilerplate, make the first two steps into a decorator.
A PEP introducing a grand unified theory of magic (tag strings) isn't inherently better than the status quo of some (f-string) magic. Less magic is better.
If the string is not an f-string, you get no help from Python tooling.
In both cases, you have to use frame hacks to get back to the scope, which has negative consequences.
So? It's been evaluated successfully. What more is there to do?
> If the string is not an f-string, you get no help from Python tooling.
Expose that tooling via the standard library. It's just pure functions.
> In both cases, you have to use frame hacks to get back to the scope, which has negative consequences.
What consequences? Isn't CPython forced to do all the nasty stuff anyhow when it's a language feature?