Multi-processing techniques in Python | And Now For Something Completely Different, Oct. 2007

#!/usr/bin/env python
# Using a shared namespace.

import processing

def f(ns):
    print ns
    ns.old_coords = (ns.x, ns.y)
    ns.x += 10
    ns.y += 10

if __name__ == '__main__':
    # Initialize the namespace
    manager = processing.Manager()
    ns = manager.Namespace()
    ns.x = 10
    ns.y = 20

    # Use the namespace in another process
    p = processing.Process(target=f, args=(ns,))
    p.start()
    p.join()

    # Show the resulting changes in this process
    print ns