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[RaiMan <question156909@xxxxxxxxxxxxxxxxxxxxx>]

Question #156909 on Sikuli changed:
https://answers.launchpad.net/sikuli/+question/156909

RaiMan posted a new comment:
BTW: subprocess.wait() does both: wait for completion AND return the
returncode.

so you just say:

returnvalue = subprocess.Popen(<what ever needed>).wait()

Only if you want to access stdin/stdout/stderr, you have to save the
Popen object:

p = subprocess.Popen(<what ever needed>)
returnvalue = p.wait
for line in p.stdout:
   print line

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