code: def is_valid(self):
          
          if not self.text:
              return False
  
          try:
              pysrt.from_string(self.text, error_handling=pysrt.ERROR_RAISE)
          except pysrt.Error as e:
              if e.args[0] < 80:
                  return False
  
          return True
docs: Check if a :attr:`text` is a valid SubRip format.
  
          :return: whether or not the subtitle is valid.
          :rtype: bool