code: def post(self, text=None, attachments=None, source_guid=None):
          
          return self.messages.create(text=text, attachments=attachments,
                                      source_guid=source_guid)
docs: Post a direct message to the user.
  
          :param str text: the message content
          :param attachments: message attachments
          :param str source_guid: a client-side unique ID for the message
          :return: the message sent
          :rtype: :class:`~groupy.api.messages.DirectMessage`