code: def get_help_msg(self,
                       dotspace_ending=False,  # type: bool
                       **kwargs):
          # type: (...) -> str
          
          context = self.get_context_for_help_msgs(kwargs)
  
          if self.help_msg is not None and len(self.help_msg) > 0:
              # create a copy because we will modify it
              context = copy(context)
  
              # first format if needed
              try:
                  help_msg = self.help_msg
                  variables = re.findall("{\S+}", help_msg)
                  for v in set(variables):
                      v = v[1:-1]
                      if v in context and len(str(context[v])) > self.__max_str_length_displayed__:
                          new_name = '@@@@' + v + '@@@@'
                          help_msg = help_msg.replace('{' + v + '}', '{' + new_name + '}')
                          context[new_name] = "(too big for display)"
  
                  help_msg = help_msg.format(**context)
  
              except KeyError as e:
                  # no need to raise from e, __cause__ is set in the constructor
                  raise HelpMsgFormattingException(self.help_msg, e, context)
  
              # then add a trailing dot and space if needed
              if dotspace_ending:
                  return end_with_dot_space(help_msg)
              else:
                  return help_msg
          else:
              return ''
docs: The method used to get the formatted help message according to kwargs. By default it returns the 'help_msg'
          attribute, whether it is defined at the instance level or at the class level.
  
          The help message is formatted according to help_msg.format(**kwargs), and may be terminated with a dot
          and a space if dotspace_ending is set to True.
  
          :param dotspace_ending: True will append a dot and a space at the end of the message if it is not
          empty (default is False)
          :param kwargs: keyword arguments to format the help message
          :return: the formatted help message