AttributeError: Assignment not allowed to composite field “task” in protocol message object

Question

I\'m using protocol-buffers python lib to send data,but it\'s have some problems, so

Traceback (most recent call last):
  File \"test_message.py\", line 17,          


        

Answer 1

Try CopyFrom:

ptask.task.CopyFrom(task)

Answer 2

I'm new to protocol-buffers too and faced with the same problem. I've found this method helpful.

I think it should work:

task = yacc.task()
task.id = 1000
task.msg = u"test"
ptask = yacc.task_info() 
ptask.task.MergeFrom(task)

Answer 3

I don't know protocol-buffers but I took a look at the docs and it says:

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.

So I'm assuming this should work:

task = yacc.task()
task.id = 1000
task.msg = u"test"
ptask = yacc.task_info() 
ptask.task.id = task.id
ptask.task.msg = task.msg