title: python auto restarting script
body: <p>I need script which starts itself at the end of process.
  I use this code but it wait for execfile. How to run it async? To do the effect of script restarting.</p>
  
  <pre><code>import time
  print "start"
  time.sleep(5)
  print "go exec"
  execfile('res.py')
  print "stop exec"
  </code></pre>