141     def _get_old_tag(self, path, subpath=None):  argument
142         return self.old_metadata and self.old_metadata.get_tag(path, subpath)
183         for subpath in self.new_metadata.iter_subpaths(path):
184             if self._get_old_tag(path, subpath) is None:
185                 yield subpath
197             for subpath in self.old_metadata.iter_subpaths(path):
198                 if self.new_metadata.get_tag(path, subpath) is None:
199                     yield subpath
211         for subpath in self.new_metadata.iter_subpaths(path):
212             old_tag = self._get_old_tag(path, subpath)
213             new_tag = self.new_metadata.get_tag(path, subpath)
215                 yield subpath
359     def _get_entry(self, path, subpath=None):  argument
368         return self._file_map.get((path, subpath))
370     def get_tag(self, path, subpath=None):  argument
372         ret = self._get_entry(path, subpath)