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astar_path_length(G, source, target, heuristic=None, weight='weight')[source]

Return the length of the shortest path between source and target using the A* (“A-star”) algorithm.

Parameters :

G : NetworkX graph

source : node

Starting node for path

target : node

Ending node for path

heuristic : function

A function to evaluate the estimate of the distance from the a node to the target. The function takes two nodes arguments and must return a number.

Raises :


If no path exists between source and target.

See also