title: Suppress stderr within subprocess.check_output()
body: <p>I'm trying to find a way to ignore the stderr stream (something similar to <code>2&gt; /dev/null</code>):</p>
  
  <pre><code>output = subprocess.check_output("netstat -nptl".split())
  </code></pre>
  
  <p>What should I add to the above command to achieve this?</p>