CLN: Old string formatting: .format() -> f""
- [x] xref #29547
- [x] passes `black pandas`
Old style % formatting to f-strings
Hello @baevpetr! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:











There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: 

##### Comment last updated at 2019-12-18 22:33:08 UTC Couple of small issues, otherwise this is a nice cleanup, thanks So there're some more `" f" ` typos. Fixed them. Sry for commit ddos. thanks @baevpetr 