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

[Nick Coghlan]

On 30 March 2018 at 20:05, Serhiy Storchaka <storchaka at gmail.com> wrote:
> 30.03.18 02:16, Steven D'Aprano пише:
>>
>> Is there a down-side to 2b? It sounds like something you might end up
>> doing at a later date regardless of what you do now.
>
> This complicate the compiler and the eval loop, especially in the case of
> nested substitutions in formats, like
>
>     f'{value:+{width:d}.{prec:d}f}'

This point reminded me that there's still
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