    def message_user(self, user, message):
        # type: (User, str) -> None
        '''
        Sends some message to a desired user, using a User object and a string message.
        '''
        channel = self._api_call('im.open', user=user['id'])['channel']['id']
        self.send_message(channel, message)
Sends some message to a desired user, using a User object and a string message.
securitybot/chat/slack.py