Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

> Eric is absolutely right, due to function calls being 
> somewhat slow in Python the performance argument in
> practice falls in favor of f-strings.

Also f-strings can evaluate expressions in the template which is also a big win:

   f('Pending {len(req)} requests: {req[0]!r} ... {req[-1]!r}')

----------
nosy: +rhettinger

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46200>
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