class_docstr: Immutable `Mapping`.
code: def __getitem__(self, key):
      return self._dict[key]
  
file_path: tensorflow/tensorflow/python/framework/immutable_dict.py
imports: import collections.abc
label_desc: Use image node_id 2 for calling the ImmutableDict obj's underlying member method code with example usage: obj.__getitem__(key) and returns: self