class_docstr: a node in a Huffman tree
class_docstr_tok: ["a","node","in","a","Huffman","tree"]
code: def is_leaf(self) -> bool:
      return self.left is None and self.right is None
  
imports: import re
  import typing
  from collections import Counter, deque
  from dataclasses import dataclass
  from bitarray import bitarray, util
  from fairseq.data import Dictionary
label_desc: Use image node_id 1 for calling the HuffmanNode obj's underlying member method code with example usage: obj.is_leaf() and returns: unknown