Pandas percentage of total with groupby

Question

This is obviously simple, but as a numpy newbe I\'m getting stuck.

I have a CSV file that contains 3 columns, the State, the Office ID, and the Sales for that office

Answer 1

I think this would do the trick in 1 line:

df.groupby(['state', 'office_id']).sum().transform(lambda x: x/np.sum(x)*100)