My main motivation as an author of 501 was to ensure user input is properly escaped when inserting into sql, which you cant enforce with f-strings.
I used to wish for that and got it in JS with template strings and libs around it. For what it’s worth (you got a whole PEP done, you have more credibility than I do) I ended up changing my mind, I think it’s a mistake.
It’s _nice_ from a syntax perspective. But it obscures the reality of sql query/parameter segregation, it builds an abstraction on top of sql that’s leaky and doesn’t even look like an abstraction.
And more importantly, it looks _way too close_ to the wrong thing. If the difference between the safe way to do sql and the unsafe way is one character and a non-trivial understanding of string formatting in python… bad things will happen. In a one-person project it’s manageable, in a bigger one where people have different experiences and seniority it will go wrong.
It’s certainly cute. I don’t thing it’s a good thing for sql queries.
One statement the PEP could put front and center in the abstract could be "t-strings are not strings".
t-string is an unfortunate name for something that is not a string.