STY: "{foo!r}" -> "{repr(foo)}" #batch-1
- [x] ref #29886
- [ ] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Anyone can help me out here?

I'm pretty lost, I have no idea why everything passed except the ```windows py3.6```.

Any ideas? thanks @MomIsBestFriend 