subprocess gets my vote too. You can do something like:
from subprocess import call, Popen, PIPE, STDOUT
def run_cmd(cmd):
....arglist = cmd.split()
....p = Popen(arglist, stdout=PIPE, stderr=STDOUT)
....output = p.communicate()[0]
....return (p.returncode, output)
rc, output = run_cmd("python setup.py test")
if rc:
....print "Command failed"
....sys.exit(rc)
Grig
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