AttributeError: Cannot access callable attribute 'groupby' of 'DataFrameGroupBy' objects

Question

I have a dataframe that has 3 columns -

I want to group the columns on the basis of Chopstick Length by doing something like this -

meansByCL = df_chopstick.groupby('Chopstick.Length')['Food.Pinching.Efficiency'].mean().reset_index()

but this throws an error -

AttributeError: Cannot access callable attribute 'groupby' of 'DataFrameGroupBy' objects, try using the 'apply' method

I'm not sure what this error means. Can anyone tell me what I'm doing wrong or how I can write this code differently?

Answer 1

This happens when you are trying to groupby() a dataframe which has been already grouped before!