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

ping @jbrockmendel  trailing whitespace gentle desperate ping @jbrockmendel  LGTM cc @WillAyd thanks @MomIsBestFriend 

definitely more readable with the f-strings, keep em coming!