code: def __repr__(self):
      return f"{Tree.__repr__(self)} [{self.prob()}]"
  
imports: from nltk.probability import ProbabilisticMixIn
  from nltk.tree.parented import MultiParentedTree, ParentedTree
  from nltk.tree.tree import Tree
label_desc: Use image node_id 3 for calling the ImmutableProbabilisticTree obj's underlying member method code with example usage: obj.__repr__() and returns: Tree, str, self, str