code: def update(self, ip: str, domain: str) -> None:
      if not self.get(domain):
          self.add(ip, domain)
  
      # inplace
      self.content = re.sub(
          f"(.+)\s+{domain}\n", f"{ip}\t{domain}\n", self.content
      )
      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 7 for calling the Hosts obj's underlying member method code with example usage: obj.update(ip, domain) without return types