def undirected_neighbors(self): return core_utils.defdict2dict(self._undirected_neighbors, self._nodes)
def children(self): return core_utils.defdict2dict(self._children, self._nodes)
def neighbors(self): return core_utils.defdict2dict(self._neighbors, self._nodes)
def parents(self): return core_utils.defdict2dict(self._parents, self._nodes)