code: def testGraphMethodProxying(self):
      g = Graph.Barabasi(100)
      vs = g.vs(1, 3, 5, 7, 9)
      self.assertEqual(vs.degree(), g.degree(vs))
      self.assertEqual(g.degree(vs), g.degree(vs.indices))
      for v, d in zip(vs, vs.degree()):
          self.assertEqual(v.degree(), d)
  
imports: import unittest
  from igraph import Graph, Vertex, VertexSeq
  from .utils import is_pypy
label_desc: Use image node_id 20 for calling the VertexSeqTests obj's underlying member method code with example usage: obj.testGraphMethodProxying() without return types