':param user_id: çšæ· ID ã å°±æ¯äœ æ¶å°ç `Message` ç source
:param media_id: åŸççåªäœIDã å¯ä»¥éè¿ :func:`upload_media` äžäŒ ã
:return: è¿åç JSON æ°æ®å'

def send_image_message(self, user_id, media_id):

    return self.post(url='https://api.weixin.qq.com/cgi-bin/message/custom/send', data={'touser': user_id, 'msgtype': 'image', 'image': {'media_id': media_id}})
