obtaining pid of child process

Hi,

I am using python's multiprocessing module to spawn new process

as follows :

import multiprocessing
import os
d = multiprocessing.Process(target=os.system,args=('iostat 2 >
a.txt',))
d.start()

I want to obtain pid of iostat command or the command executed using
multiprocessing
module

When I execute :

d.pid it gives me pid of subshell in which this command is running .

Any help will be valuable .

Thanks in advance

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