class_docstr: Immutable `Mapping`.
code: def __contains__(self, key):
      return key in self._dict
  
file_path: tensorflow-upstream/tensorflow/python/framework/immutable_dict.py
imports: import collections.abc
label_desc: Use image node_id 3 for calling the ImmutableDict obj's underlying member method code with example usage: obj.__contains__(key) and returns: unknown