code: def setup_privnet(self, host=None):
          
          self.setup(FILENAME_SETTINGS_PRIVNET)
          if isinstance(host, str):
              if ":" in host:
                  raise Exception("No protocol prefix or port allowed in host, use just the IP or domain.")
              print("Using custom privatenet host:", host)
              self.SEED_LIST = ["%s:20333" % host]
              self.RPC_LIST = ["http://%s:30333" % host]
              print("- P2P:", ", ".join(self.SEED_LIST))
              print("- RPC:", ", ".join(self.RPC_LIST))
          self.check_privatenet()
docs: Load settings from the privnet JSON config file
  
          Args:
              host (string, optional): if supplied, uses this IP or domain as neo nodes. The host must
                                       use these standard ports: P2P 20333, RPC 30333.