Resolved: Pandas Number of Unique Values from 2 Fields

Question:

I am trying to find the number of unique values that cover 2 fields. So for example, a typical example would be last name and first name. I have a data frame.

When I do the following, I just get the number of unique fields for each column, in this case, Last and First. Not a composite.
Thanks!

Answer:

Groupby both columns first, and then use nunique

If you have better answer, please add a comment about this, thank you!