code: def __setitem__(self, key, value):
      if key is None:
          value = sticky_attribute_assignment(
              trackable=self,
              value=value,
              name=self.__class__._SINGLETON,
          )
      else:
          value = sticky_attribute_assignment(
              trackable=self, value=value, name=key
          )
      super().__setitem__(key, value)
  
imports: from collections import OrderedDict
  import numpy
  import tensorflow
  from tensorflow.python.training.tracking.tracking import AutoTrackable
  from tensorflow.python.training.tracking.data_structures import sticky_attribute_assignment
  from tensorforce.core.utils import NestedDict
label_desc: Use image node_id 3 for calling the TrackableNestedDict obj's underlying member method code with example usage: obj.__setitem__(key, value) without return types