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Wed Mar 28 17:09:32 EDT 2018 · https://mail.python.org/pipermail/python-dev/2018-March/152512.html

On 29 March 2018 at 07:39, Eric V. Smith <eric at trueblade.com> wrote:

> I’d vote #3 as well.
>
> > On Mar 28, 2018, at 11:27 AM, Serhiy Storchaka <storchaka at 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.
>
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[Python-Dev] Subtle difference between f-strings and str.format()