code: def testBug73(self):
      # This is a regression test for igraph/python-igraph#73
      g = Graph()
      g.add_vertices(3)
      g.vs[0]["name"] = 1
      g.vs[1]["name"] = "h"
      g.vs[2]["name"] = 17
  
      self.assertEqual(1, g.vs.find("h").index)
      self.assertEqual(1, g.vs.find(1).index)
      self.assertEqual(0, g.vs.find(name=1).index)
      self.assertEqual(2, g.vs.find(name=17).index)
  
imports: import unittest
  from igraph import Graph, Vertex, VertexSeq
  from .utils import is_pypy
label_desc: Use image node_id 21 for calling the VertexSeqTests obj's underlying member method code with example usage: obj.testBug73() without return types