Add column to the end of Pandas DataFrame containing average of previous data

Question

I have a DataFrame ave_data that contains the following:

ave_data

Time        F7           F8            F9  
00:00:00    43.005593    -56.509746           


        

Answer 1

In common case if you would like to use specific columns, you can use:

df['average'] = df[['F7','F8']].mean(axis=1)

where axis=1 stands for rowwise action (using column values for each row to calculate the mean in 'average' column)

Then you may want to sort by this column:

df.sort_values(by='average',ascending=False, inplace=True)

where inplace=True stands for applying action to dataframe instead of calculating on the copy.