title: Is there a way to bin categorical data in pandas?
body: <p>I've got a dataframe where one column is U.S. states. I'd like to create a new column and bin the states according to region, i.e., South, Southwest, etc. It looks like pd.cut is only used for continuous variables, so binning that way doesn't seem like an option. Is there a good way to create a column that's conditional on categorical data in another column? </p>