topological_sort_recursive(G, nbunch=None, reverse=False)[source]¶
Return a list of nodes in topological sort order.
A topological sort is a nonunique permutation of the nodes such that an edge from u to v implies that u appears before v in the topological sort order.
- G (NetworkX digraph) –
- nbunch (container of nodes (optional)) – Explore graph in specified order given in nbunch
- reverse (bool, optional) – Return postorder instead of preorder if True. Reverse mode is a bit more efficient.
NetworkXError– Topological sort is defined for directed graphs only. If the graph G is undirected, a NetworkXError is raised.
NetworkXUnfeasible– If G is not a directed acyclic graph (DAG) no topological sort exists and a NetworkXUnfeasible exception is raised.
This is a recursive version of topological sort.