> *pa = ethics_net.get_shortest_paths(beg_node,end_node)* > [...] > *ValueError: no such vertex: '12'*. > > There is a vertex 12, I created it with this statement: You are passing "12" as a string while it should either be a vertex index (i.e. a numeric value) or the value of the "name" attribute of some vertex that identifies the vertex uniquely.
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