predecessor¶

predecessor(G, source, target=None, cutoff=None, return_seen=None)[source]¶

Returns dictionary of predecessors for the path from source to all nodes in G.

Parameters:	G (NetworkX graph) – source (node label) – Starting node for path target (node label, optional) – Ending node for path. If provided only predecessors between source and target are returned cutoff (integer, optional) – Depth to stop the search. Only paths of length <= cutoff are returned.
Returns:	pred – Dictionary, keyed by node, of predecessors in the shortest path.
Return type:	dictionary

Examples

>>> G=nx.path_graph(4)
>>> print(G.nodes())
[0, 1, 2, 3]
>>> nx.predecessor(G,0)
{0: [], 1: [0], 2: [1], 3: [2]}