Wait I don't understand why you wouldn't accept a wholesale replacement of all `%` and `format` with f-strings through the entire CPython codebase [master branch]?

BTW: Kinda unrelated, but would be great to have perspective on this little project - https://github.com/SamuelMarks/doctrans - I'm interested in wholesale enforcement of code consistency and translating between constructs (e.g., dataclass to/fro argparse to/fro class method; ReST to/fro Google to/fro NumPy dostrings; inline types to/fro types in docstrings; with more planned)