I'd like to have a two-dimensional sequential color palettes, for example, for use in a choropleth map (I guess as a type of bivariate map).
So for example, maybe hue (to indicate one value) and saturation (to indicate the other, here I have in mind population size).
Is there an off-the-shelf palette that I can use for this? If not, is that because there a recommended alternative for visualizing this information?
Python-friendly answers are especially helpful but this is a bit more generic.