Warning

This documents an unmaintained version of NetworkX. Please upgrade to a maintained version and see the current NetworkX documentation.

networkx.algorithms.dag.ancestors

ancestors(G, source)[source]

Returns all nodes having a path to source in G.

Parameters:
  • G (NetworkX DiGraph) – A directed acyclic graph (DAG)
  • source (node in G)
Returns:

The ancestors of source in G
Return type:

set()