Pandas Groupby and Sum Only One Column

Question

So I have a dataframe, df1, that looks like the following:

       A      B      C
1     foo    12    California
2     foo    22    California
3     bar    8          


        

Answer 1

If you don't care what's in your column C and just want the nth value, you could just do this:

df.groupby('A').agg({'B' : 'sum',
                     'C' : lambda x: x.iloc[n]})