title: Variable inside subprocess.check_output argument ? [Python]
body: <p>simple question:</p>
  
  <p>why this doesnt work?</p>
  
  <pre><code>test = 2
  
  print subprocess.check_output(["program",
                                 "-v",
                                 "-a5",
                                 "-t%i",   &lt;----------
                                 "-oURL",
                                 "-uUSER",
                                 "-pPASS"]) % (test)
  </code></pre>
  
  <p>with "-t1" or other value, it work perfectly.</p>