code: def messages(self):
          
          if self._messages is None:
              self._messages = MessageList(self._version, account_sid=self._solution['sid'], )
          return self._messages
docs: Access the messages
  
          :returns: twilio.rest.api.v2010.account.message.MessageList
          :rtype: twilio.rest.api.v2010.account.message.MessageList