code: def result(self):
          
  
          if self._read_only:
              return self._result
          with self._condition:
              if self._wait_for_tree and not self._result_set_in_context:
                  self._condition.wait_for(
                      lambda: self._tree_has_set or self._result_set_in_context)
              return self._result
docs: Return the value at an address, optionally waiting until it is
          set from the context_manager, or set based on the pre-fetch mechanism.
  
          Returns:
              (bytes): The opaque value for an address.