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@sunmy2019 done

@CharlieZhao95 any updates on this?

@CharlieZhao95 any updates on this?

Thanks! Just a little reminder. The docstrings I've seen usually describe functions in the form of "what does this function can do", just like:

function A
Return True if xxx. If xxx, return False.

And it's rare to see "how can we use this function/type":

You could subclass type xxx.

This is probably not a problem that needs to be modified, I know this docstring comes from the official documentation. Aside from this, LGTM! Next step you could wait for review from core devs :)

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