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 <rosuav@gmail.com> wrote:
On Wed, Feb 24, 2021 at 4:13 AM Richard Damon <Richard@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
_______________________________________________
Python-ideas mailing list -- python-ideas@python.org
To unsubscribe send an email to python-ideas-leave@python.org
https://mail.python.org/mailman3/lists/python-ideas.python.org/
Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/UEZIQ56UYPDWQE3UU5BP72ADRKM2ZSNB/
Code of Conduct: http://python.org/psf/codeofconduct/


--
Stefane Fermigier - http://fermigier.com/ - http://twitter.com/sfermigier - http://linkedin.com/in/sfermigier
Founder & CEO, Abilian - Enterprise Social Software - http://www.abilian.com/
Chairman, National Council for Free & Open Source Software (CNLL) - http://cnll.fr/
Founder & Organiser, PyParis & PyData Paris - http://pyparis.org/ & http://pydata.fr/