[Zope] Re: Saving Pipe3 object

[Li Dongfeng]

I have solved this problem. Giving an non-persistent attribute
a name starting with "_v_" can avoid pickling it. So I used
  setattr(self, "_v_long_R_Pipe", long_R)
and the attribute can be access outside of the defining method.

Li Dongfeng wrote:

> I'm using ZOPE to develope a statistics server using R(a GPLed
> statistical software). For this, I started the R executable with
> popen2.Popen in an external method, but I need to exit the method
> without shutting down the pipe, so I used
> setattr(self, "some_name", the_pipe) to save the Pipe3 object
> as an attribute,
> and got an error message: Object unpicklable.
>
> I understand a open pipe cannot be restored from a file,
> but can I save the Pipe3 object reference somewhere
> in the running ZOPE's name space without pickling?
> Then I can use it in other method to control the
> running R process.
>
> This is a general problem if you want to use Zope
> to control other long-running processes.