I have a list of labels which I'd like to attach to the rendering of a
graph. I can get a PDF with labels on the edges using:

import graph_tool.all as gt
[[[make graph g with vertices and edges]]]
gt.graphviz_draw(g, eprops={"label":g.edge_index},output="out.pdf") #produces a graph with edges labeled 0 to n-1
gt.graphviz_draw(g, eprops={"label":"test label"},output="out.pdf") #produces a graph with all edges labeled "test label", so labeling with
strings is possible

What I'd like to do is to use those edge_index values as index for an arary
containing my labels as strings to be placed in the graph.

eprops={"label":labelStrings[i]} # where i is equal to the numeric value of
the edge_index

How would I do that?

edge_index is a PropertyMap so that can't be used as index, but getting the
values out as an array fails too so apparently it is of type vector or
object.

Being able to assign a label at the moment the edge is created with add_egde
would work too and is even preferable in my situation, so that might be a
solution too if I'd know how.

I have a list of labels which I'd like to attach to the rendering of a
graph. I can get a PDF with labels on the edges using:

import graph_tool.all as gt
[[[make graph g with vertices and edges]]]
gt.graphviz_draw(g, eprops={"label":g.edge_index},output="out.pdf") #produces a graph with edges labeled 0 to n-1
gt.graphviz_draw(g, eprops={"label":"test label"},output="out.pdf") #produces a graph with all edges labeled "test label", so labeling with
strings is possible

What I'd like to do is to use those edge_index values as index for an

arary

containing my labels as strings to be placed in the graph.

eprops={"label":labelStrings[i]} # where i is equal to the numeric

value of

the edge_index

How would I do that?

All you have to do is to create an edge property map with a value type
'string':

label = g.new_edge_property("string")

e = g.add_edge(s, t)
label[e] = "label for new edge"

graphviz_draw(g, eprops={"label": label})

Perhaps if I could see what a 'vector' is as defined here I might be

A vector in this context is a C++ vector which is reflected into
python. This refers to the type the property map stores, rather than the
property map itself.