comando previo a subprocess

[Juan Carlos Rodrigo]

# me gustaria trackear los pid de los subprocesos...
import popen2, os

def xsystem( cmd ):
  worker = popen2.Popen4( cmd )
  print worker.pid # PID
  worker.tochild.close()
  line = worker.fromchild.read()
  while line:
    print line
    line = worker.fromchild.read()
  return os.WEXITSTATUS( worker.wait() )

if __name__ == "__main__":
  assert xsystem("ls -l") == 0
  assert xsystem("sleep 1") == 0

# Saludos
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