Note

This documents the development version of NetworkX. Documentation for the current release can be found here.

networkx.algorithms.dag.dag_longest_path

dag_longest_path(G, weight='weight', default_weight=1, topo_order=None)[source]

Returns the longest path in a directed acyclic graph (DAG).

If G has edges with weight attribute the edge data are used as weight values.

Parameters
  • G (NetworkX DiGraph) – A directed acyclic graph (DAG)

  • weight (str, optional) – Edge data key to use for weight

  • default_weight (int, optional) – The weight of edges that do not have a weight attribute

  • topo_order (list or tuple, optional) – A topological order for G (if None, the function will compute one)

Returns

Longest path

Return type

list

Raises

NetworkXNotImplemented – If G is not directed