code: def find_child_index(self, child_name):
      assert isinstance(child_name, str)
  
      index = -1
      for i in range(len(self.children)):
          if child_name == self.children[i].name:
              index = i
      return index
  
imports: import queue
label_desc: Use image node_id 23 for calling the StatNode obj's underlying member method code with example usage: obj.find_child_index(child_name) and returns: index