[igraph] write to file problem

[Simone Gabbriellini]

Hello list,

I am trying to write to file a graph that I have just generated with:

# build graph
g = igraph.Graph(top+bottom, directed = False)
# add attributes
g.vs["type"] = [int(i >= top) for i in xrange(top+bottom)]
g.vs["name"] = [v.index for v in g.vs]
# add some random edges between top and bottom nodes
[g.add_edges((v.index, random.choice(g.vs(type=1)).index)) for v in
random.sample(g.vs(type=0), bottom)]
# write file
g.write_graphml('test.graphml')

but nothing happens... is there something I am missing in the writing method?

Best regards,
Simone