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I’d vote #3 as well.

\> On Mar 28, 2018, at 11:27 AM, Serhiy Storchaka <storchaka@gmail.com> wrote:
\>
\> There is a subtle semantic difference between str.format() and "equivalent" f-string.
\>
\> '{}{}'.format(a, b)
\> f'{a}{b}'
\>
> In most cases this doesn't matter, but when implement the optimization that transforms the former expression to the the latter one (\[1\], \[2\]) we have to make a decision what to do with this difference.