Pass data to a subprocess

andrea crotti andrea.crotti.0 at
Tue Jul 31 15:56:37 CEST 2012

I'm having fun in the world of multiprocessing, and I would like some

For example suppose I want to create many processes and pass them some
data to process (also why they are running).

I found many nice things (Pipe, Manager and so on), but actually even
this seems to work:

class MyProcess(Process):
    def __init__(self):
        Process.__init__(self) = []

    def __str__(self):
        return str(

    def add(self, ls): += ls

    def run(self):
        print("running the process in another subprocess")

def procs():
    mp = MyProcess()
    # with the join we are actually waiting for the end of the running time

Which is a bit surprising, because it means that I can pass data to an
object that is running on another process.
Is it because of some magic in the background and can I rely on that or
simply I didn't understand how it works?

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