title: subprocess.Popen: Different buffering for stdin, stdout, stderr?
body: <p>I'm in need of setting the <code>stderr</code> stream in a <a href="http://docs.python.org/py3k/library/subprocess.html#subprocess.Popen" rel="nofollow"><code>Popen</code></a> call to line-buffered. I discovered the <code>bufsize</code> argument, but it applies to all of the <code>stdin</code>, <code>stdout</code>, and <code>stderr</code> files.</p>
  
  <p>How do I adjust the buffering to be different for each file?</p>