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

The formatting specification language is already complicated enough without 
adding even more to it. As PEP 378 says "It is not the goal to replace the 
locale module, to perform internationalization tasks, or accommodate every 
possible convention."

Your best bet is to write your own formater and use that:

f'{formater(v)}'

You could also pass it whatever parameters you want, like specifying the number 
of digits or the separator or whether to use the locale to determine these 
things.

The PEP suggests Babel (http://babel.pocoo.org/en/latest/), which I don't have 
any experience with, but seems pretty complete.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41250>
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