python - Object method as multiprocessing.Process target -

i'm tinkering threads, shed light what's going on here?

from multiprocessing import process time import sleep  class thing(object):     def __init__(self):         print "__init__:", id(self)         self.a = 100         self.b = 200    def run(self):       while true:           sleep(5)           print id(self.a), self.a, '*', id(self.b), self.b 

i open script via python -i , do:

t = thing() p = process(target=t.run) p.start() # thread starts running , reporting ids every 5 seconds  # if do.. t.a = 500  # address of `t.a` changes (using `id()`) , thread still reports 100. 

i understand expecting work mean sketchy thread communication, looks @ point there 2 thing() objects, 1 available me , 1 inside process(). when copied?

and important:

how change value of self.a inside process()?

in situation using processes not threads, need inter process communication. can achieve queues. see http://docs.python.org/dev/library/multiprocessing.html, 17.2.1.3. exchanging objects between processes.