Construct pandas DataFrame from list of tuples of (row,col,values)
I have a list of tuples like
data = [ ('r1', 'c1', avg11, stdev11), ('r1', 'c2', avg12, stdev12), ('r2', 'c1', avg21, stdev21), ('r2', 'c2', avg22, stdev22) ]
and I would like to put them into a pandas DataFrame with rows named by the first column and columns named by the 2nd column. It seems the way to take care of the row names is something like
pandas.DataFrame([x[1:] for x in data], index = [x for x in data]) but how do I take care of the columns to get a 2x2 matrix (the output from the previous set is 3x4)? Is there a more intelligent way of taking care of row labels as well, instead of explicitly omitting them?
EDIT It seems I will need 2 DataFrames - one for averages and one for standard deviations, is that correct? Or can I store a list of values in each "cell"?
You can pivot your DataFrame after creating:
>>> df = pd.DataFrame(data) >>> df.pivot(index=0, columns=1, values=2) # avg DataFrame 1 c1 c2 0 r1 avg11 avg12 r2 avg21 avg22 >>> df.pivot(index=0, columns=1, values=3) # stdev DataFrame 1 c1 c2 0 r1 stdev11 stdev12 r2 stdev21 stdev22