Add vertex attributes to a weighted igraph Graph in python -

i learning python-igraph, , having difficulty in handling graph divided components (which unconnected between them). when apply 1 of clustering algorithms on graph doesn't seem work properly, , need apply algorithms each subgraph (component) separately. in order maintain identification of vertices, add vertex attribute give me id number in original graph. graph constructed weighted adjacency matrix:

import numpy np import igraph  def symmetrize(a):     return + a.t - 2*np.diag(a.diagonal())  = symmetrize(np.random.random((100,100)))  g = igraph.graph.adjacency(a.tolist(),attr="weight",mode="upper") 

i see there should way add vertex attributes, don't understand how use it..

adding vertex attribute of vertices works this:

g.vs["attr"] = ["id1", "id2", "id3", ...] 

you can attach vertex attribute single vertex:

g.vs[2]["attr"] = "id3" 

for instance, if need unique identifier vertices, can this:

g.vs["original_id"] = list(range(g.vcount())) 

(you don't need list() part if on python 2.x range() produces list).