code: def archive_if_exists(filename):
      
      if os.path.exists(filename):
          current_time = datetime.datetime.now()
          dt_format = '%Y-%m-%dT%H:%M:%S%z'
          timestamp = current_time.strftime(dt_format)
          dst = filename + '_' + timestamp
          shutil.move(filename, dst)
docs: Move `filename` out of the way, archiving it by appending the current datetime
      Can be a file or a directory