Is there a simple way to define
a method that adds  labels to the vertices
of a graph or digraph? I would like to have
something like

G.show(labels = ['a', 'b', 'c'])

when G is a graph with vertices  [0,1,2].

Apparently, this is possible for graphs defined as
dictionaries, but not for graphs defined
from adjacency matrices.

Thank you!

Giovanni

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