Solution?:
The beginning of the code for line_graph:
if self._directed:
G=DiGraph()
G.add_vertices(self.edges(labels=labels))
for v in self:
# Connect appropriate incident edges of the vertex v
G.add_edges([(e,f) for e in self.incoming_edge_iterator
(v, labels=labels) \
for f in self.outgoing_edge_iterator(v,
labels=labels)])
return G
I think that if self.allow_loops() == True, then
G = DiGraph()
should be
G = DiGraph(loops=True)
Dave
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