Python script merging some columns to one column with new name

[Gribouillis]

You need to translate the rows according to the plan, so replace the lines 77 to 88 by

fieldnames = [pair[0] for pair in plan]
 
writer = csv.DictWriter(outfile, delimiter=';', fieldnames=fieldnames, extrasaction='ignore')
headers = {n: n for n in writer.fieldnames}
writer.writerow(headers)
for row in reader:
    new_row = merge(plan, row)
    writer.writerow(new_row)