Both '%' and .format() support both positional and named arguments.

There are probably a few use cases for .format() (vs. f-strings) but
overall I don't believe there is much reasons left to prefer %.

Note that the existence, and popularity, of tools like flynt and
pyupgrade (that convert % and .format() directives to f-strings
automatically) supports this affirmation.

I found the 'un-fstring' project on pypi that does the reverse, but it's
use case, as advertised in the README, is clear: "Sometimes, unfortunately,
you need to write code that is compatible with Python 3.5"...

  S.


On Tue, Feb 23, 2021 at 6:50 PM Chris Angelico <ros...@gmail.com> wrote:

> On Wed, Feb 24, 2021 at 4:13 AM Richard Damon <rich...@damon-family.org>
> wrote:
> > As far as between % or .format(), I think the documentation is fairly
> > clear that the % method is 'old' and if not 'formally' deprecated, is no
> > longer considered the 'obvious' way to do it (even if some people will
> > still do it that way for the simplest cases).
>
> Not really - both forms have their places. You use .format() when you
> need to be able to reorder arguments, you use percent formatting when
> you want a compact and simple notation. It's like how we have both
> string methods and regular expressions - neither one deprecates the
> other.
>
> ChrisA
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