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This documents an unmaintained version of NetworkX. Please upgrade to a maintained version and see the current NetworkX documentation.
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
Dictionary, keyed by node, of predecessors in the shortest path.
Examples
>>> G=nx.path_graph(4) >>> print(G.nodes()) [0, 1, 2, 3] >>> nx.predecessor(G,0) {0: [], 1: [0], 2: [1], 3: [2]}