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

im not sure if we have a convention for `__setstate__` or `strptime` cases, the rest look good > im not sure if we have a convention for `__setstate__` or `strptime` cases, the rest look good

Would you like me to remove them, at least for this PR. and open a separate one containing only them?

 > Would you like me to remove them, at least for this PR. and open a separate one containing only them?

Either that or wait for @WillAyd to chime in Thanks @MomIsBestFriend 