code: def __str__(self):
      if self.children is None:
          return self.label
      return "[%s %s]" % (
          self.label,
          " ".join([str(c) for c in self.children]),
      )
  
imports: import re
  import codecs
  import random
  from collections import Counter
label_desc: Use image node_id 3 for calling the Tree obj's underlying member method code with example usage: obj.__str__() and returns: unknown, self