code: def unset(self, host, *args):
          
          self.__check_host_args(host, args)
          remove_idx = [idx for idx, x in enumerate(self.lines_)
                        if x.host == host and x.key.lower() in args]
          for idx in reversed(sorted(remove_idx)):
              del self.lines_[idx]
docs: Removes settings for a host.
  
          Parameters
          ----------
          host : the host to remove settings from.
          *args : list of settings to removes.