At first I made a statistic analyst to get the sum of the field area for equal Ids.Now I need the sum of all area fields from the output-table therefore I did another statistic analyst to get the sum. With a searchcursor I tried to get the sumvalue to put it in the calculate field tool. But in the end it is not calculating the percent, so the field I add before and I don’t know what I did wrong. I need to do it with arcpy because it is a small part of a big tool I’m trying to