Vertex & Edge Labels

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import warnings; warnings.simplefilter('ignore')

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@interact

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def _(N=[2,3,4]):

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    bd=digraphs.ButterflyGraph(N)

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    nvl=[u+'$\\to$'+str(v) for u,v in bd.vertices()]

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    bd.relabel(dict(zip(bd.vertices(),nvl)))

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    [bd.set_edge_label(u,v,v) 

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     for u,v,l in bd.edges()]

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    bd.show(figsize=6,vertex_size=3,

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            layout='circular',color_by_label=True)

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