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Proper syntax highlighting should solve this.

It's not a language solution, but an AST based linter perhaps? PyCQA might have one already; they definitely have a "consider using f-strings" lint you can turn on.

What if the compiler issued a warning if the f was missing and let you suppress the warning with an r?

Then it might as well be fstrings by default, rstrings for raw.

Good idea! If we do away with f strings entirely the problem does not occur.