text: from dataclasses import dataclass
  
  
  class FormatterBase:
      def __init__(self, length_limit: int):
          self._length_limit = length_limit
  
      def is_message_too_long(self, message_length: int, message_idx: int):
          return message_length > self._length_limit
  
      def format(self, split_messages):
          """
          Add the extra formatting characters
          """
          for message in split_messages:
              assert len(message) <= self._length_limit
          return split_messages
  
  
  @dataclass
  class RecalculateGroups(Exception):
      new_formatter: FormatterBase
  