jeffersonqin <1247006...@qq.com> added the comment:

Thanks! This fully answers my question. Sorry, but I've got another question 
regards to your answer. It is that when I deal with other fields in class 
Parent similar to child, with the only difference is that their types are 
builtin types such as integer and boolean, everything works fine and can be 
correctly serialized after been modified. What's the difference between these 
two cases?
Again, sorry for disturbing and thanks a lot for your detailed answer.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue47034>
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