[mod_python] Session Pickling Error II - 3.2.2b

GATOR AIDE wrote ..
> After updating mod_python 3.1.4 to 3.2.2b I am getting
> an error:
> 
> PythonHandler mod_python.publisher: TypeError: can't
> pickle function objects
> 
> I am storing a function in the session and calling
> session.save(). (Which is when the error is raised.)
> 
> Using mod_python 3.1.4 the code works just fine but
> after the update I am now seeing this error.
> 
> The code simply stores a dictionary and few function
> callbacks in the session and loops through several
> functions until it is done processing. 
> 
> Not sure if anyone else has had this problem? I
> running centos 2.4.21-27.0.4.ELsmp on a x86_64
> platform. Python 2.4.2 (same error w/2.4.1). Apache
> 2.0.46.
> 
> I wasn't sure if this is the right place to post this,
> so I apologize if I should have posted the question
> elsewhere.

I am going to hazard a guess and say that pickle probably only allows
you to pickle a function objects where the function object resides in a
module which was imported using "import", ie., lives in "sys.modules".

In mod_python 3.2, mod_python.publisher handler modules are no longer
imported using the Python "import" mechanism but are instead read in as
strings and executed against a dictionary of an empty module which does
not actually exist in sys.modules.

      def build(self, key, name, opened, entry):
        try:
            module = new.module(re_not_word.sub('_',key))
            module.__file__ = key
            exec opened in module.__dict__
            return module
        finally:
            opened.close()

The error would seem reasonable under these circumstances because if it
were pickled, it wouldn't perhaps be unable to unpickle it later as it
wouldn't know the name of a module in "sys.modules" to associate the
function reference to.

Are you sure you can't use a string reference or something else as a handle
to refer to the callback function rather than an actual function object?

Graham