Use this if you are using igraph from R
List names of edge attributes
edge_attr_names(graph)
| graph | The graph. | 
Character vector, the names of the edge attributes.
Other graph attributes: 
delete_edge_attr(),
delete_graph_attr(),
delete_vertex_attr(),
edge_attr<-(),
edge_attr(),
graph_attr<-(),
graph_attr_names(),
graph_attr(),
igraph-dollar,
igraph-vs-attributes,
set_edge_attr(),
set_graph_attr(),
set_vertex_attr(),
vertex_attr<-(),
vertex_attr_names(),
vertex_attr()
g <- make_ring(10) %>%
  set_edge_attr("label", value = letters[1:10])
edge_attr_names(g)
plot(g)