Python中Protobuff变量未被赋值

Question

message = internal.RegisterExecutorMessage()
message.framework_id.value = self.framework_id
print('message.framework_id.value: %s' % message.framework_id.value)
print('self.framework_id: %s' % self.framework_id)
message.executor_id.value = self.executor_id
print('message.executor_id.value: %s' % message.executor_id.value)

即使右侧有正确的值，message.framework\u id.value和message.executor\u id.value都不会被分配这些变量

作为背景，尝试在windows上用Python编写Mesos执行器