code: def __len__(self) -> int:
      # TODO lazier
      try:
          last_idx = self.last_idx()
      except KeyError:
          return 0
      return last_idx + 1
  
imports: import numpy
  from typing import Any, Iterator, List, Tuple, Union
  from aim.storage.treeview import TreeView
  from aim.storage.arrayview import ArrayView
label_desc: Use image node_id 8 for calling the TreeArrayView obj's underlying member method code with example usage: obj.__len__() and returns: unknown, int