python如何提取对象内的元素

Message(MessageMediaDocument(document=Document(id=620850100255067285, access_hash=56378852293897728, file_reference=b'\x04Wy\\\x91\x00\x00\x00\x05\\\xdb\x02\x03\xfb\xd3\xdb/\xdf\x18G\n),~<\x19\x14O\x8c', date=datetime.datetime(2019, 4, 27, 13, 32, 4, tzinfo=datetime.timezone.utc), mime_type='video/mp4', size=221326, dc_id=5, attributes=[DocumentAttributeVideo(duration=5, w=220, h=220, round_message=False, supports_streaming=True), DocumentAttributeFilename(file_name='doc_2019-04-27_21-26-24.mp4'), DocumentAttributeAnimated()], thumbs=[PhotoStrippedSize(type='i', bytes=b'\x01((\xb7#\xed\x8c\x91\xd6\xb3\x00\xc8\x0eI98lU\xdb\xa6>Q\x03\xae*\x92\x05D\xd8z\x1e\xbc\xf5\xa4\x95\xca\xbd\x8b\xf6\xf81\x92=1CRC Hp\x17\x00PdW\xfb\xbd\xba\x8a\x9bX\xab\xdct\x07\xf7\xea=\xe8\xa4\x80\xff\x00\xa4\xa5\x14\x12Grv\xa9f \n\xcf\xb7;\x9d\xb2I\xcf\xadj\xb2+\x8c:\x86\x1e\x84f\xa0\x9e\x15\x00\x18\xe3U\xf5*1T\x98=G\xa8\r\x17\x97\xd3wzb@\xd1>\xc2\xcc\xdb\xbb\xd1\x08c"\x068\x1dE_\x02\xa5\x94\x88b\x80\xc7(rs\x8a*\xc5\x14\x85c1\xe7e\xc7+\xf8\xb5"N]\xb6\x90\x08>\x8d\x9a(\xa7\x1dP\xe7\xa3\xd0\x9a0\x1e\xe00\xfb\xaa\xb8\xaby\xf7\xa2\x8aL\x07\x02(\xa2\x8a\x04\x7f'), PhotoSize(type='m', location=FileLocation(dc_id=5, volume_id=855110615, local_id=20472, secret=15308370490108288, file_reference=b'\x04Wy\\\x91\x00\x00\x00\x05\\\xdb\x02\x03M,s\xe7\x95\x1e5\xb2\x0fn\xd8\x05\x00\x17:\t'), w=220, h=220, size=9059)]), ttl_secOnds=None))