networkx.algorithms.shortest_paths.weighted.all_pairs_dijkstra¶

all_pairs_dijkstra
(G, cutoff=None, weight='weight')[source]¶ Find shortest weighted paths and lengths between all nodes.
 Parameters
G (NetworkX graph)
cutoff (integer or float, optional) – Depth to stop the search. Only return paths with length <= cutoff.
weight (string or function) – If this is a string, then edge weights will be accessed via the edge attribute with this key (that is, the weight of the edge joining
u
tov
will beG.edge[u][v][weight]
). If no such edge attribute exists, the weight of the edge is assumed to be one.If this is a function, the weight of an edge is the value returned by the function. The function must accept exactly three positional arguments: the two endpoints of an edge and the dictionary of edge attributes for that edge. The function must return a number.
 Yields
(node, (distance, path)) ((node obj, (dict, dict))) – Each source node has two associated dicts. The first holds distance keyed by target and the second holds paths keyed by target. (See single_source_dijkstra for the source/target node terminology.) If desired you can apply
dict()
to this function to create a dict keyed by source node to the two dicts.
Examples
>>> G = nx.path_graph(5) >>> len_path = dict(nx.all_pairs_dijkstra(G)) >>> print(len_path[3][0][1]) 2 >>> for node in [0, 1, 2, 3, 4]: ... print('3  {}: {}'.format(node, len_path[3][0][node])) 3  0: 3 3  1: 2 3  2: 1 3  3: 0 3  4: 1 >>> len_path[3][1][1] [3, 2, 1] >>> for n, (dist, path) in nx.all_pairs_dijkstra(G): ... print(path[1]) [0, 1] [1] [2, 1] [3, 2, 1] [4, 3, 2, 1]
Notes
Edge weight attributes must be numerical. Distances are calculated as sums of weighted edges traversed.
The yielded dicts only have keys for reachable nodes.