file_lines = open("game.csv").readlines() outfile = open("game_edited.csv", "w") header = file_lines[0].split(",") outfile.write(file_lines[0].strip() + ", total\n") for line in file_lines[1:]: lsp = line.split(",") name = lsp[0] total = sum([int(prey_count) for prey_count in lsp[1:]]) print(name + " has caught " + str(total) + " animals.") outfile.write(line.strip() + "," + str(total) + "\n")