Changed string formatting to fstring
- [x] xref #29547
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`

I am new to contributing to open source projects bare with me. I normally only push to my own 
master branch. I have never used git diff before(I know it is supposed to compare changed) and I just keep getting the error: fatal: bad revision 'upstream/master' if someone could tell me how to properly use it that would be great! It passed the black pandas test though. Once I figure out how to properly submit a PR abiding by pandas standards I will do trying a lot more PR. This is only a sample

> Thanks for the changes @ForTimeBeing
> 
> You should have git remotes for:
> 
>     * `origin`: your fork
> 
>     * `upstream`: this repo (pandas-dev/pandas)
> 
> 
> Something like `git remote add upstream git@github.com:pandas-dev/pandas.git` should leave this correct if you cloned your fork, and the diff should work.

I now have upstreams as well:

origin  https://github.com/ForTimeBeing/pandas.git (fetch)
origin  https://github.com/ForTimeBeing/pandas.git (push)
upstream        git@github.com:pandas-dev/pandas.git (fetch)
upstream        git@github.com:pandas-dev/pandas.git (push)

I am still getting the bad revision though run `git fetch upstream` first @ForTimeBeing can you merge master to fix ci issues. @ForTimeBeing can you try one more merge of master? GH is showing me a zero-file diff.  Have these changes already been merged? I guess this has been addressed elsewhere. Closing. I apologize, I have not been around because of the holiday

Happy holidays everyone