':param media_id: åªäœæä»¶ ID
:return: requests ç Response å®äŸ'

def download_permanent_media(self, media_id):

    return requests.post(url='https://api.weixin.qq.com/cgi-bin/material/get_material', params={'access_token': self.token}, data=_json.dumps({'media_id': media_id}, ensure_ascii=False).encode('utf-8'))
