code: def _filter_ignored(self, entries, selector=None):
      
      selector = selector or (lambda x: x)
      prefixed_entries = [(self._append_slash_if_dir_path(selector(entry)), entry)
                            for entry in entries]
      ignored_paths = set(self.ignore.match_files(path for path, _ in prefixed_entries))
      return [entry for path, entry in prefixed_entries if path not in ignored_paths]
docs: Given an opaque entry list, filter any ignored entries.
  
      :param entries: A list or generator that produces entries to filter.
      :param selector: A function that computes a path for an entry relative to the root of the
        ProjectTree, or None to use identity.