code: def from_dict(cls, operation, client, **caller_metadata):
          
          operation_pb = json_format.ParseDict(operation, operations_pb2.Operation())
          result = cls(operation_pb.name, client, **caller_metadata)
          result._update_state(operation_pb)
          result._from_grpc = False
          return result
docs: Factory: construct an instance from a dictionary.
  
          :type operation: dict
          :param operation: Operation as a JSON object.
  
          :type client: :class:`~google.cloud.client.Client`
          :param client: The client used to poll for the status of the operation.
  
          :type caller_metadata: dict
          :param caller_metadata: caller-assigned metadata about the operation
  
          :rtype: :class:`Operation`
          :returns: new instance, with attributes based on the protobuf.