code: def testCombinationIgnoreAsNone(self):
      g = self.g
      g.es["name"] = list("ABCDEFG")
      g.simplify(combine_edges={"weight": "min", "name": None})
      self.assertTrue(g.es["weight"] == [1, 3, 4])
      self.assertFalse("weight2" in g.edge_attributes())
      self.assertFalse("name" in g.edge_attributes())
  
imports: import unittest
  from igraph import Graph
label_desc: Use image node_id 13 for calling the AttributeCombinationTests obj's underlying member method code with example usage: obj.testCombinationIgnoreAsNone() without return types