code: def add(self, ip: str, domain: str) -> None:
      if self.get(domain):
          return
  
      self.content = self.content.rstrip() + f"\n{ip}\t{domain}"
      self.__write()
  
imports: import argparse
  from functools import cached_property
  import os
  from pathlib import Path
  import platform
  import re
  import sys
label_desc: Use image node_id 5 for calling the Hosts obj's underlying member method code with example usage: obj.add(ip, domain) without return types