CLN: remove redundant code related to Styler
`non_reducing_slice` is performed within the `apply` so no need to execute twice.

`maybe_numeric_slice` is a convoluted wrapper for selecting numeric columns so removed.

Nice.  IIRC non_reducing_slice is only used in this file, would it make sense to move it there? > Nice. IIRC non_reducing_slice is only used in this file, would it make sense to move it there?

Yes I observed the same but was bigger change. updated now. thanks @attack68 

would you mind doing a PR splitting up test_style.py (you can create a sub-dir and put in several tests modules) as its getting kind of long.