Hello, I'm writing an application with heavy graph operations. It's written in python, so i've tried networkx, igraph and lately i've tried to use boost graph library bindings to python (BGL-PY). Thanks god i ran into graph-tool which looks very complete and also is doing a transition into something very handy for me (python accessible boost-based library). I'm having a look at the API i found here: http://projects.forked.de/graph-tool/doc/quickstart.html#creating-and-manipu... and i see i add vertices with g = Graph() g.add_vertices() and calculate the betweeness centrality with graph_tool.centrality.betweeness_centrality(). As i was looking for an implementation of a minimum spanning tree i realized i couldn't find it in the reference i pointed a couple of lines above. So i had a look at the graph_tool.py that uses the library and realized that the interface is different there. Graph = GraphInterface() Graph.GetBetweennessCentrality() or Graph.GetMinimumSpanningTree() etc, and i cannot find any add_vertex() in this API. I'm a bit confused, so i'm trying to understand what i should use to have full power over the graph-tool API. TIA Claudio Martella -- Claudio Martella claudio.martella@gmail.com