can't use multiprocessing with class factory?

Fri Jan 28 14:42:21 EST 2011

On 1/28/11 1:25 PM, Daniel Urban wrote:
> Only classes defined on the top level of a module are picklable (see
> http://docs.python.org/dev/py3k/library/pickle#what-can-be-pickled-and-unpickled
> ). The collections.namedtuple class factory function works around this
> limitation by setting the __module__ attribute of the created class,
> but I'm not sure if this solution can be used in this case.

namedtuple's trick only works when you assign the created class to a name at the 
module level. E.g.
 MyFancyTuple = collections.namedtuple(...)
The trick won't work for "anonymous" classes like the above use case.
-- 
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth."
 -- Umberto Eco