code: def modify_things(self):
      # Set different names to different things
      val = self.index
      setattr(self, "var%d" % (val), val)
  
imports: from metaflow_test import MetaflowTest, ExpectationFailed, steps
label_desc: Use image node_id 2 for calling the MergeArtifactsPropagationTest obj's underlying member method code with example usage: obj.modify_things() without return types