class_docstr: A tree implementation.
class_docstr_tok: ["A","tree","implementation","."]
docstr: Check if a item is in the tree.
docstr_tok: ["Check","if","a","item","is","in","the","tree","."]
code: def __contains__(self, item):
      """Check if a item is in the tree."""
      return item in self._all_nodes
  
imports: from __future__ import annotations
  from typing import Container, Iterable, Optional
  import numpy
  from satpy import DataID, DatasetDict
  from satpy.dataset import ModifierTuple, create_filtered_query
  from satpy.dataset.data_dict import TooManyResults, get_key
  from satpy.node import EMPTY_LEAF_NAME, LOG, CompositorNode, MissingDependencies, Node, ReaderNode
label_desc: Use image node_id 6 for calling the Tree obj's underlying member method code with example usage: obj.__contains__(item) and returns: unknown