Fix Python – Format / Suppress Scientific Notation from Pandas Aggregation Results

How can one modify the format for the output from a groupby operation in pandas that produces scientific notation for very large numbers?
I know how to do string formatting in python but I’m at a loss when it comes to applying it here.
df1.groupby(‘dept’)[‘data1’].sum()

dept
value1 1.192433e+08
value2 1.293066e+08
value3 1.077….