Use this if you are using igraph from R
List names of vertex attributes
vertex_attr_names(graph)
| graph | The graph. | 
Character vector, the names of the vertex attributes.
Other graph attributes: delete_edge_attr,
delete_graph_attr,
delete_vertex_attr,
edge_attr<-, edge_attr_names,
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
g <- make_ring(10) %>%
  set_vertex_attr("name", value = LETTERS[1:10]) %>%
  set_vertex_attr("color", value = rep("green", 10))
vertex_attr_names(g)
plot(g)