Admittedly I’m not so familiar with Python; it does work in Java. In that case, introducing a less hazardous string concatenation operator would seem more universally useful.

In Python, that less hazardous string concatenation operator is an f-string.

I’m assuming you can only use it with string literals, hence it is less universally useful.

Nope, you can put expressions in them:

f'{a} = {functionThatReturnsAButHasSideEffects()}'