Removing group header after pandas aggregation

Question

Suppose I have the following:

In [20]: df.groupby("dummy").agg({"returns": [np.mean, np.sum]})
Out[20]: 
        returns          
            sum      mean

dummy                    
1      0.285833  0.028583

How do I remove the "returns" header? So that I have a dataframe with columns 'sum' and 'mean'?

Answer 1

Use -

df.columns = df.columns.droplevel(0)

To drop the top column level