code: def testCallableFilteringSelect(self):
      only_even = self.g.vs.select(lambda v: (v.index % 2 == 0))
      self.assertTrue(len(only_even) == 5)
      self.assertRaises(KeyError, only_even.__getitem__, "nonexistent")
      self.assertTrue(only_even["test"] == [0, 2, 4, 6, 8])
  
imports: import unittest
  from igraph import Graph, Vertex, VertexSeq
  from .utils import is_pypy
label_desc: Use image node_id 10 for calling the VertexSeqTests obj's underlying member method code with example usage: obj.testCallableFilteringSelect() without return types