new_contents: import file_io
  
  class ResultObj(object):
      def __init__(self, result_file_name):
          self.result_file_name = result_file_name
          self.file_list = list()
  
      def add_to_list(self, file_name_list, *args):
          curr_list = list()
          for i, f in enumerate(file_name_list):
              print(f)
              curr_str = f + " " 
              for arg in args:
                  curr_str = curr_str + arg[i] + " "
  
              # remove last empty space
              curr_str = curr_str[:-1] 
              curr_list.append(curr_str)
  
          self.file_list += curr_list
  
      def save_to_file(self, sort_result = True):
          if sort_result:
              self.file_list.sort()
          file_io.save_file(self.file_list, self.result_file_name)
  
      def float_to_str(self, float_list, sformat):
          str_list = list()
          for f in float_list:
              str_list.append(sformat%(f))
  
          return str_list
  
  
  
subject: add result_obj