Python AttributeError：不允许分配给协议消息对象中的复合字段“任务”
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AttributeError: Assignment not allowed to composite field "task" in protocol message object
提问by gezhonglunta
I'm using protocol-buffers python lib to send data,but it's have some problems, so
我正在使用协议缓冲区 python lib 发送数据，但它有一些问题，所以
Traceback (most recent call last):
File "test_message.py", line 17, in <module>
ptask.task = task
File "build\bdist.win32\egg\google\protobuf\internal\python_message.py", line
513, in setter
AttributeError: Assignment not allowed to composite field "_task" in protocol message object.
the src as follows:
src 如下：
proto file:
原型文件：
message task {
required int32 id = 1;
required string msg = 2;
}
message task_info {
required task task = 1;
}
python code:
蟒蛇代码：
task = yacc.task()
task.id = 1000
task.msg = u"test"
ptask = yacc.task_info()
ptask.task = task # this line happen the runtime error
采纳答案by Martin Maillard
I don't know protocol-buffersbut I took a look at the docsand it says:
我不知道协议缓冲区，但我看了看文档，它说：
You cannot assign a value to an embedded message field. Instead, assigning a value to any field within the child message implies setting the message field in the parent.
您不能为嵌入的消息字段赋值。相反，为子消息中的任何字段赋值意味着在父消息中设置消息字段。
So I'm assuming this should work:
所以我假设这应该有效：
task = yacc.task()
task.id = 1000
task.msg = u"test"
ptask = yacc.task_info()
ptask.task.id = task.id
ptask.task.msg = task.msg
回答by Aleksandro M Granda
I'm new to protocol-buffers too and faced with the same problem. I've found this methodhelpful.
我也是协议缓冲区的新手，面临同样的问题。我发现这个方法很有帮助。
I think it should work:
我认为它应该有效：
task = yacc.task()
task.id = 1000
task.msg = u"test"
ptask = yacc.task_info()
ptask.task.MergeFrom(task)
