class_docstr: A generic tree node.
  
  Parameters
  ----------
  kwargs
      Each provided keyword argument is stored in the leaf as an attribute.
class_docstr_tok: ["A","generic","tree","node",".","Parameters","--","--","--","--","--","kwargs","Each","provided","keyword","argument","is","stored","in","the","leaf","as","an","attribute","."]
code: def height(self):
      return 1
  
imports: from __future__ import annotations
  import abc
  import typing
  from collections import defaultdict
  from queue import Queue
  from xml.etree import ElementTree
  import pandas
  from river import base
label_desc: Use image node_id 7 for calling the Leaf obj's underlying member method code with example usage: obj.height() and returns: int