Python Pandas: Passing Multiple Functions to agg() with Arguments

Question

I\'m struggling to figure out how to combine two different syntaxes for pandas\' dataframe.agg() function. Take this simple data frame:

df = pd.Dat         


        

Answer 1

Well, the docs on aggregate are in fact a bit lacking. There might be a way to handle this with the correct passing of arguments, and you could look into the source code of pandas for that (perhaps I will later).

However, you could easily do:

df.groupby('A').agg([np.mean, lambda x: np.std(x, ddof=0)])

And it would work just as well.