CLN: Removed unused varibles from for loops
- [ ] closes #xxxx
- [ ] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Can we remove the cdef declarations for `i`? > Can we remove the cdef declarations for `i`?

@jbrockmendel No, There's is uses for it in some of the for-loops. Thanks @MomIsBestFriend 