Q:

How do I customize the display of edge labels in networkx?

I create a graph with edge attributions (say r, such as, r=23).
How do display edge labels only with the values, 23 instead of {'r':'23'}.

Related source codes are below:
# build a graph
G.add_edge(u, v, r=value)

# plot the graph
pos = nx.spring_layout(G, scale=2)

nx.draw(G, pos)

edge_labels = nx.get_edge_attributes(G,'r')
nx.draw_networkx_edge_labels(G, pos, labels = edge_labels)

plt.savefig(out_file)

A:

The command draw_networkx_edge_labels needs the argument edge_labels rather than `labels.  
So you need to change nx.draw_networkx_edge_labels(G, pos, labels = edge_labels) to nx.draw_networkx_edge_labels(G, pos, edge_labels = edge_labels)

