[Python-Dev] Subtle difference between f-strings and str.format()

[Paul Moore]

On 28 March 2018 at 19:44, Serhiy Storchaka <storchaka at gmail.com> wrote:
> 28.03.18 19:20, Guido van Rossum пише:
>
>> Hm, without thinking too much about it I'd say it's okay to change the
>> evaluation order.
>
> Do you mean the option 3, right? This is the simplest option. I have already
> wrote a PR for optimizing old-style formating [1], but have not merged it
> yet due to this change of semantic.

I can't imagine (non-contrived) code where the fact that a is
formatted before b is evaluated would matter, so I'm fine with option
3.

Paul