inspect-safety for DataFrame._constructor_expanddim
- [x] closes #31549, closes #31474
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Ah, interesting, it's  failing *without* jinja2, since `df.style` returns a Styler, which requires jinja2 to initialize.

I'm fine with just ignoring this for now, and essentially requiring jinaj2 for `inspect.getmembers` to work. > I'm fine with just ignoring this for now, and essentially requiring jinaj2 for inspect.getmembers to work.

agreed thanks how about a follow-up for Series._constructor_sliced