Python:如何查找图中2个节点之间是否存在路径? [英] Python: How to find if a path exists between 2 nodes in a graph?

问题描述

我正在使用Python的networkx软件包.

I am using networkx package of Python.

推荐答案

>>> import networkx as nx
>>> G=nx.empty_graph()
>>> G.add_edge(1,2)
>>> G.add_edge(2,3)
>>> G.add_edge(4,5)
>>> nx.path.bidirectional_dijkstra(G,1,2)
(1, [1, 2])
>>> nx.path.bidirectional_dijkstra(G,1,3)
(2, [1, 2, 3])
>>> nx.path.bidirectional_dijkstra(G,1,4)
False
>>> nx.path.bidirectional_dijkstra(G,1,5)
False
>>> 

您还可以将结果用作布尔值

You can also use the result as a boolean value

>>> if nx.path.bidirectional_dijkstra(G,1,2): print "path exists"
... 
path exists
>>> if nx.path.bidirectional_dijkstra(G,1,4): print "path exists"
... 
>>> 

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