code: def get_csv(filename):
      
      check_if_this_file_exist(filename)
  
      #Process this function
      filename = os.path.abspath(filename)
      s = command_line(['exiftool', '-G', '-csv', '-sort', filename])
      if s:
          #convert bytes to string
          s = s.decode('utf-8')
          return s
      else:
          return 0
docs: Return a csv representation of the exif
  
      get a filename and returns a unicode string with a CSV format
  
      Arguments:
          filename {string} -- your filename
  
      Returns:
          [unicode] -- unicode string