code: def _encode_self(self, recalc_crc=True):
      version = self.magic
      if version == 1:
          fields = (
              self.crc,
              self.magic,
              self.attributes,
              self.timestamp,
              self.key,
              self.value,
          )
      elif version == 0:
          fields = (
              self.crc,
              self.magic,
              self.attributes,
              self.key,
              self.value,
          )
      else:
          raise ValueError(
              "Unrecognized message version: %s" % (version,)
          )
      message = Message.SCHEMAS[version].encode(fields)
      if not recalc_crc:
          return message
      self.crc = crc32(message[4:])
      crc_field = self.SCHEMAS[version].fields[0]
      return crc_field.encode(self.crc) + message[4:]
  
imports: from __future__ import absolute_import
  import io
  import time
  from kafka.codec import has_gzip, has_snappy, has_lz4, has_zstd, gzip_decode, snappy_decode, zstd_decode, lz4_decode, lz4_decode_old_kafka
  from kafka.protocol.frame import KafkaBytes
  from kafka.protocol.struct import Struct
  from kafka.protocol.types import Int8, Int32, Int64, Bytes, Schema, AbstractType
  from kafka.util import crc32, WeakMethod
label_desc: Use image node_id 3 for calling the Message obj's underlying member method code with example usage: obj._encode_self(recalc_crc) and returns: unknown, message