pickle problem

[krustymonkey at gmail.com]

On May 8, 5:48 am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> krustymon... at gmail.com wrote:
> > I'm wondering if anyone can help with a workaround for a problem I
> > currently have.  I'm trying to set up a prefork tcp server.
> > Specifically, I'm setting up a server that forks children and has them
> > listen on pipes created with os.pipe().  The parent process for the
> > group starts an inet:tcp server on a given port.  In the parent, after
> > a "socket.accept()", I'm trying to pickle the connection object to
> > send over an IPC pipe (as stated previously), but I get the following
> > error:
>
> > File "/usr/lib/python2.4/copy_reg.py", line 76, in _reduce_ex
> >     raise TypeError("a class that defines __slots__ without "
> > TypeError: a class that defines __slots__ without defining
> > __getstate__ cannot be pickled
>
> > Does anyone know of a workaround for this?  Maybe my approach to this
> > is wrong?  Any help would be appreciated.
>
> The error-message is pretty clear I'd say. You use slots - so you are
> responsible yourself for implementing the pickling-protocol using
> __getstate__ and __setstate__. Looking at the pickle-docs should give you
> an idea.
>
> But the really easy solution is: do not use slots. They are intended as
> memory-consumption optimization technique, *not* as "I want to declare my
> attributes explicitly"-mechanism. So - get rid of them and be a happy
> pickler.
>
> Diez

The thing is, I'm not using slots by choice.  I'm using the standard
lib "socket" class, which apparently uses slots.