new_contents: # -*- coding: utf-8 -*-
  import sys
  
  # pylint: disable=C0103
  class FileUtils(object):
      """
          Fileutils class
      """
      @staticmethod
      def sequential(file):
          """
              @param {pathlib.Path} file
              @return {pathlib.Path}
              exsample)exists file
                  exsample.png
                  exsample(1).png
                  exsample(2).png
                  exsample(n).png
          """
          i = 0
          basePath = file
          while file.exists():
              i += 1
              file = file.with_name('{0}({1}){2}'.format(basePath.stem, i, basePath.suffix))
              if sys.maxsize == i:
                  break
          return file
  
subject: add FileUtils class