code: def testCombinationTypeMismatch(self):
      g = self.g
      g.es["weight"] = list("ABCDEFG")
      self.assertRaises(
          TypeError, g.simplify, combine_edges={"weight": "mean"}
      )
  
imports: import unittest
  from igraph import Graph
label_desc: Use image node_id 17 for calling the AttributeCombinationTests obj's underlying member method code with example usage: obj.testCombinationTypeMismatch() without return types