CLN: some code cleanups
- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

@MomIsBestFriend IIUC cython support for black is under development, https://github.com/psf/black/issues/359. > @MomIsBestFriend IIUC cython support for black is under development, [psf/black#359](https://github.com/psf/black/issues/359).

Thank you @simonjayhawkins, me and my OCD are thrilled, I subscribed to that thread :laughing: 
 Can you merge master? Otherwise I think this is good to go @MomIsBestFriend looking at the diff of the merge master, it looks like you've lost some of your clean-ups. > @MomIsBestFriend looking at the diff of the merge master, it looks like you've lost some of your clean-ups.

@simonjayhawkins Correct, in 1cc4e89 I have reverted everything lost in the merge conflicts. All green. @jreback you requested changes, if you want to have another look, this should be ready. ok as long as purely cosmetic  Thanks @MomIsBestFriend 