code: def to_bytes(self) -> bytes:
      return self._public_key.public_bytes(
          encoding=serialization.Encoding.OpenSSH,
          format=serialization.PublicFormat.OpenSSH,
      )
  
imports: from __future__ import annotations
  import base64
  import threading
  from abc import ABC, abstractmethod
  from cryptography import exceptions
  from cryptography.hazmat.primitives import hashes, serialization
  from cryptography.hazmat.primitives.asymmetric import padding, rsa
label_desc: Use image node_id 3 for calling the RSAPublicKey obj's underlying member method code with example usage: obj.to_bytes() and returns: self