Eric V. Smith <e...@trueblade.com> added the comment:

> 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]?

For such a large change it's difficult to review every single change and ensure 
it's correct. I'm guessing there are thousands of occurrences.

In addition, it runs the risk of breaking any existing pull requests.

And in the vast majority of cases it wouldn't make any noticeable performance 
difference. So why risk the breakage and endure the hassle?

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42699>
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