> > sage: G = DiGraph({1:{2: 2}, 2:{1:1}})
> > sage: G.show()
>
> I'm surprised by the output of this. There are clearly two edges in the
> graph: 1->2 and 2->1, but only one edge is shown.
No, the format for multiple edges in a dict of dicts is {u : {v :
[label1, label2]} }. Since you don't have the innermost list, the
graph is assumed to have one edge 1 --> 2 labeled by "2."
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