code: def testIntersectionManyAttributes(self):
      gs = [Graph.Tree(7, 2), Graph.Lattice([7])]
      gs[0]["attr"] = "graph1"
      gs[0].vs["name"] = [
          "one",
          "two",
          "three",
          "four",
          "five",
          "six",
          "7",
      ]
      gs[1].vs["name"] = [
          "one",
          "two",
          "three",
          "four",
          "five",
          "six",
          "7",
      ]
      gs[0].vs[0]["attr"] = "set"
      gs[1].vs[5]["attr"] = "set_too"
      g = intersection(gs)
      names = g.vs["name"]
      self.assertTrue(g["attr"] == "graph1")
      self.assertTrue(g.vs[names.index("one")]["attr"] == "set")
      self.assertTrue(g.vs[names.index("six")]["attr"] == "set_too")
      self.assertTrue(g.ecount() == 1)
      self.assertTrue(
          set(g.get_edgelist()[0])
          == {names.index("one"), names.index("two")},
      )
  
imports: import unittest
  from igraph import Graph, disjoint_union, intersection, union
label_desc: Use image node_id 21 for calling the OperatorTests obj's underlying member method code with example usage: obj.testIntersectionManyAttributes() without return types