code: def testIndexAndKeywordFilteringFind(self):
      self.assertRaises(ValueError, self.g.vs.find, 2, name="G")
      self.assertRaises(ValueError, self.g.vs.find, 2, test=4)
      self.assertTrue(self.g.vs.find(2, name="C") == self.g.vs[2])
      self.assertTrue(self.g.vs.find(2, test=2) == self.g.vs[2])
  
imports: import unittest
  from igraph import Graph, Vertex, VertexSeq
  from .utils import is_pypy
label_desc: Use image node_id 18 for calling the VertexSeqTests obj's underlying member method code with example usage: obj.testIndexAndKeywordFilteringFind() without return types