def get_url(self, media_id):
parts = (<EOL>'<STR_LIT>',<EOL>'<STR_LIT>',<EOL>self.access_token,<EOL>'<STR_LIT>',<EOL>media_id<EOL>)<EOL>return '<STR_LIT>'.join(parts)<EOL>
获取临时素材下载地址

:param media_id: 媒体文件 ID
:return: 临时素材下载地址