How to get a PID of a child process from a process openden with Popen()

Fri Apr 8 06:40:10 EDT 2011

Hello,
I am starting a GUI-application as another user with kdesu in my python
script:
	import shlex, subprocess
	p = subprocess.Popen(shlex.split("kdesu -u test program"))
How can I aquire the PID of the program which kdesu starts?
p.pid just returns the PID of kdesu, but I need the PID of the
child process from kdesu.
My System: openSUSE 11.4 64-Bit, Python 2.7.
Regards
Pedro Santos