Issue here is:

1. in .pre-commit-config.yaml, change the ref of pyupgrade from v2.7.4 to v2.9.0
2. run pre-commit run pyupgrade --all-files
3. run pre-commit run flake8 --all-files - there will be lots of errors from unused imports, so you should remove them (or you could look into using autoflake to do it for you)
4. if both `pre-commit run fl

Is your feature request related to a problem? Please describe.
It might be useful to have a singular clean and performant way to check if all the columns of a dataframe are of the same dtype, such as a DataFrame property _is_homogeneous. This comes up in a lot of places, such as where we might want to dispatch to a cupy matrix implementation (Transpose, some row wise reductions I believe

• What's wrong?

Rank widget does not show that Manual selection is active, if:

1. Best ranked was active.
2. I clicked into the white part of the table to deselect.

The "Select Attributes" radio button still has "Best ranked" active, but nothing is selected (and the status bar shows that nothing gets to the output). Instead, the "Select Attributes" radio button should switch to "

Implements {DataFrame,Series}.empty

The plotly plots on my macbook on Ubuntu 20.04 and pandasgui 0.2.3.2 have very tiny font. Wondering if there's a way to change this.. See pic below.